| 1 | /* Display generation from window structure and buffer text. |
| 2 | Copyright (C) 1985, 86, 87, 88, 93, 94, 95, 97, 98, 99 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | /* New redisplay written by Gerd Moellmann <gerd@gnu.org>. |
| 23 | |
| 24 | Redisplay. |
| 25 | |
| 26 | Emacs separates the task of updating the display from code |
| 27 | modifying global state, e.g. buffer text. This way functions |
| 28 | operating on buffers don't also have to be concerned with updating |
| 29 | the display. |
| 30 | |
| 31 | Updating the display is triggered by the Lisp interpreter when it |
| 32 | decides it's time to do it. This is done either automatically for |
| 33 | you as part of the interpreter's command loop or as the result of |
| 34 | calling Lisp functions like `sit-for'. The C function `redisplay' |
| 35 | in xdisp.c is the only entry into the inner redisplay code. (Or, |
| 36 | let's say almost---see the the description of direct update |
| 37 | operations, below.). |
| 38 | |
| 39 | The following diagram shows how redisplay code is invoked. As you |
| 40 | can see, Lisp calls redisplay and vice versa. Under window systems |
| 41 | like X, some portions of the redisplay code are also called |
| 42 | asynchronously during mouse movement or expose events. It is very |
| 43 | important that these code parts do NOT use the C library (malloc, |
| 44 | free) because many C libraries under Unix are not reentrant. They |
| 45 | may also NOT call functions of the Lisp interpreter which could |
| 46 | change the interpreter's state. If you don't follow these rules, |
| 47 | you will encounter bugs which are very hard to explain. |
| 48 | |
| 49 | (Direct functions, see below) |
| 50 | direct_output_for_insert, |
| 51 | direct_forward_char (dispnew.c) |
| 52 | +---------------------------------+ |
| 53 | | | |
| 54 | | V |
| 55 | +--------------+ redisplay() +----------------+ |
| 56 | | Lisp machine |---------------->| Redisplay code |<--+ |
| 57 | +--------------+ (xdisp.c) +----------------+ | |
| 58 | ^ | | |
| 59 | +----------------------------------+ | |
| 60 | Don't use this path when called | |
| 61 | asynchronously! | |
| 62 | | |
| 63 | expose_window (asynchronous) | |
| 64 | | |
| 65 | X expose events -----+ |
| 66 | |
| 67 | What does redisplay? Obviously, it has to figure out somehow what |
| 68 | has been changed since the last time the display has been updated, |
| 69 | and to make these changes visible. Preferably it would do that in |
| 70 | a moderately intelligent way, i.e. fast. |
| 71 | |
| 72 | Changes in buffer text can be deduced from window and buffer |
| 73 | structures, and from some global variables like `beg_unchanged' and |
| 74 | `end_unchanged'. The contents of the display are additionally |
| 75 | recorded in a `glyph matrix', a two-dimensional matrix of glyph |
| 76 | structures. Each row in such a matrix corresponds to a line on the |
| 77 | display, and each glyph in a row corresponds to a column displaying |
| 78 | a character, an image, or what else. This matrix is called the |
| 79 | `current glyph matrix' or `current matrix' in redisplay |
| 80 | terminology. |
| 81 | |
| 82 | For buffer parts that have been changed since the last update, a |
| 83 | second glyph matrix is constructed, the so called `desired glyph |
| 84 | matrix' or short `desired matrix'. Current and desired matrix are |
| 85 | then compared to find a cheap way to update the display, e.g. by |
| 86 | reusing part of the display by scrolling lines. |
| 87 | |
| 88 | |
| 89 | Direct operations. |
| 90 | |
| 91 | You will find a lot of of redisplay optimizations when you start |
| 92 | looking at the innards of redisplay. The overall goal of all these |
| 93 | optimizations is to make redisplay fast because it is done |
| 94 | frequently. |
| 95 | |
| 96 | Two optimizations are not found in xdisp.c. These are the direct |
| 97 | operations mentioned above. As the name suggests they follow a |
| 98 | different principle than the rest of redisplay. Instead of |
| 99 | building a desired matrix and then comparing it with the current |
| 100 | display, they perform their actions directly on the display and on |
| 101 | the current matrix. |
| 102 | |
| 103 | One direct operation updates the display after one character has |
| 104 | been entered. The other one moves the cursor by one position |
| 105 | forward or backward. You find these functions under the names |
| 106 | `direct_output_for_insert' and `direct_output_forward_char' in |
| 107 | dispnew.c. |
| 108 | |
| 109 | |
| 110 | Desired matrices. |
| 111 | |
| 112 | Desired matrices are always built per Emacs window. The function |
| 113 | `display_line' is the central function to look at if you are |
| 114 | interested. It constructs one row in a desired matrix given an |
| 115 | iterator structure containing both a buffer position and a |
| 116 | description of the environment in which the text is to be |
| 117 | displayed. But this is too early, read on. |
| 118 | |
| 119 | Characters and pixmaps displayed for a range of buffer text depend |
| 120 | on various settings of buffers and windows, on overlays and text |
| 121 | properties, on display tables, on selective display. The good news |
| 122 | is that all this hairy stuff is hidden behind a small set of |
| 123 | interface functions taking a iterator structure (struct it) |
| 124 | argument. |
| 125 | |
| 126 | Iteration over things to be be displayed is then simple. It is |
| 127 | started by initializing an iterator with a call to init_iterator |
| 128 | (or init_string_iterator for that matter). Calls to |
| 129 | get_next_display_element fill the iterator structure with relevant |
| 130 | information about the next thing to display. Calls to |
| 131 | set_iterator_to_next move the iterator to the next thing. |
| 132 | |
| 133 | Besides this, an iterator also contains information about the |
| 134 | display environment in which glyphs for display elements are to be |
| 135 | produced. It has fields for the width and height of the display, |
| 136 | the information whether long lines are truncated or continued, a |
| 137 | current X and Y position, and lots of other stuff you can better |
| 138 | see in dispextern.h. |
| 139 | |
| 140 | Glyphs in a desired matrix are normally constructed in a loop |
| 141 | calling get_next_display_element and then produce_glyphs. The call |
| 142 | to produce_glyphs will fill the iterator structure with pixel |
| 143 | information about the element being displayed and at the same time |
| 144 | produce glyphs for it. If the display element fits on the line |
| 145 | being displayed, set_iterator_to_next is called next, otherwise the |
| 146 | glyphs produced are discarded. |
| 147 | |
| 148 | |
| 149 | Frame matrices. |
| 150 | |
| 151 | That just couldn't be all, could it? What about terminal types not |
| 152 | supporting operations on sub-windows of the screen? To update the |
| 153 | display on such a terminal, window-based glyph matrices are not |
| 154 | well suited. To be able to reuse part of the display (scrolling |
| 155 | lines up and down), we must instead have a view of the whole |
| 156 | screen. This is what `frame matrices' are for. They are a trick. |
| 157 | |
| 158 | Frames on terminals like above have a glyph pool. Windows on such |
| 159 | a frame sub-allocate their glyph memory from their frame's glyph |
| 160 | pool. The frame itself is given its own glyph matrices. By |
| 161 | coincidence---or maybe something else---rows in window glyph |
| 162 | matrices are slices of corresponding rows in frame matrices. Thus |
| 163 | writing to window matrices implicitly updates a frame matrix which |
| 164 | provides us with the view of the whole screen that we originally |
| 165 | wanted to have without having to move many bytes around. To be |
| 166 | honest, there is a little bit more done, but not much more. If you |
| 167 | plan to extend that code, take a look at dispnew.c. The function |
| 168 | build_frame_matrix is a good starting point. */ |
| 169 | |
| 170 | #include <config.h> |
| 171 | #include <stdio.h> |
| 172 | #include "lisp.h" |
| 173 | #include "frame.h" |
| 174 | #include "window.h" |
| 175 | #include "termchar.h" |
| 176 | #include "dispextern.h" |
| 177 | #include "buffer.h" |
| 178 | #include "charset.h" |
| 179 | #include "indent.h" |
| 180 | #include "commands.h" |
| 181 | #include "macros.h" |
| 182 | #include "disptab.h" |
| 183 | #include "termhooks.h" |
| 184 | #include "intervals.h" |
| 185 | #include "keyboard.h" |
| 186 | #include "coding.h" |
| 187 | #include "process.h" |
| 188 | #include "region-cache.h" |
| 189 | |
| 190 | #ifdef HAVE_X_WINDOWS |
| 191 | #include "xterm.h" |
| 192 | #endif |
| 193 | |
| 194 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 195 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
| 196 | |
| 197 | #define INFINITY 10000000 |
| 198 | |
| 199 | #if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) |
| 200 | extern void set_frame_menubar (); |
| 201 | extern int pending_menu_activation; |
| 202 | #endif |
| 203 | |
| 204 | extern int interrupt_input; |
| 205 | extern int command_loop_level; |
| 206 | |
| 207 | extern int minibuffer_auto_raise; |
| 208 | |
| 209 | extern Lisp_Object Qface; |
| 210 | |
| 211 | extern Lisp_Object Voverriding_local_map; |
| 212 | extern Lisp_Object Voverriding_local_map_menu_flag; |
| 213 | extern Lisp_Object Qmenu_item; |
| 214 | |
| 215 | Lisp_Object Qoverriding_local_map, Qoverriding_terminal_local_map; |
| 216 | Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions; |
| 217 | Lisp_Object Qredisplay_end_trigger_functions; |
| 218 | Lisp_Object Qinhibit_point_motion_hooks; |
| 219 | Lisp_Object QCeval, Qwhen, QCfile; |
| 220 | Lisp_Object Qfontified; |
| 221 | |
| 222 | /* Functions called to fontify regions of text. */ |
| 223 | |
| 224 | Lisp_Object Vfontification_functions; |
| 225 | Lisp_Object Qfontification_functions; |
| 226 | |
| 227 | /* Non-zero means draw tool bar buttons raised when the mouse moves |
| 228 | over them. */ |
| 229 | |
| 230 | int auto_raise_tool_bar_buttons_p; |
| 231 | |
| 232 | /* Margin around tool bar buttons in pixels. */ |
| 233 | |
| 234 | int tool_bar_button_margin; |
| 235 | |
| 236 | /* Thickness of shadow to draw around tool bar buttons. */ |
| 237 | |
| 238 | int tool_bar_button_relief; |
| 239 | |
| 240 | /* Non-zero means automatically resize tool-bars so that all tool-bar |
| 241 | items are visible, and no blank lines remain. */ |
| 242 | |
| 243 | int auto_resize_tool_bars_p; |
| 244 | |
| 245 | /* Non-nil means don't actually do any redisplay. */ |
| 246 | |
| 247 | Lisp_Object Vinhibit_redisplay, Qinhibit_redisplay; |
| 248 | |
| 249 | /* Names of text properties relevant for redisplay. */ |
| 250 | |
| 251 | Lisp_Object Qdisplay, Qrelative_width, Qwidth, Qalign_to; |
| 252 | extern Lisp_Object Qface, Qinvisible, Qimage; |
| 253 | |
| 254 | /* Symbols used in text property values. */ |
| 255 | |
| 256 | Lisp_Object Qspace, QCalign_to, QCrelative_width, QCrelative_height; |
| 257 | Lisp_Object Qleft_margin, Qright_margin, Qspace_width, Qheight, Qraise; |
| 258 | Lisp_Object Qmargin; |
| 259 | |
| 260 | /* Non-nil means highlight trailing whitespace. */ |
| 261 | |
| 262 | Lisp_Object Vshow_trailing_whitespace; |
| 263 | |
| 264 | /* Name of the face used to highlight trailing whitespace. */ |
| 265 | |
| 266 | Lisp_Object Qtrailing_whitespace; |
| 267 | |
| 268 | /* The symbol `image' which is the car of the lists used to represent |
| 269 | images in Lisp. */ |
| 270 | |
| 271 | Lisp_Object Qimage; |
| 272 | |
| 273 | /* Non-zero means print newline to stdout before next mini-buffer |
| 274 | message. */ |
| 275 | |
| 276 | int noninteractive_need_newline; |
| 277 | |
| 278 | /* Non-zero means print newline to message log before next message. */ |
| 279 | |
| 280 | static int message_log_need_newline; |
| 281 | |
| 282 | \f |
| 283 | /* The buffer position of the first character appearing entirely or |
| 284 | partially on the line of the selected window which contains the |
| 285 | cursor; <= 0 if not known. Set by set_cursor_from_row, used for |
| 286 | redisplay optimization in redisplay_internal. */ |
| 287 | |
| 288 | static struct text_pos this_line_start_pos; |
| 289 | |
| 290 | /* Number of characters past the end of the line above, including the |
| 291 | terminating newline. */ |
| 292 | |
| 293 | static struct text_pos this_line_end_pos; |
| 294 | |
| 295 | /* The vertical positions and the height of this line. */ |
| 296 | |
| 297 | static int this_line_vpos; |
| 298 | static int this_line_y; |
| 299 | static int this_line_pixel_height; |
| 300 | |
| 301 | /* X position at which this display line starts. Usually zero; |
| 302 | negative if first character is partially visible. */ |
| 303 | |
| 304 | static int this_line_start_x; |
| 305 | |
| 306 | /* Buffer that this_line_.* variables are referring to. */ |
| 307 | |
| 308 | static struct buffer *this_line_buffer; |
| 309 | |
| 310 | /* Nonzero means truncate lines in all windows less wide than the |
| 311 | frame. */ |
| 312 | |
| 313 | int truncate_partial_width_windows; |
| 314 | |
| 315 | /* A flag to control how to display unibyte 8-bit character. */ |
| 316 | |
| 317 | int unibyte_display_via_language_environment; |
| 318 | |
| 319 | /* Nonzero means we have more than one non-mini-buffer-only frame. |
| 320 | Not guaranteed to be accurate except while parsing |
| 321 | frame-title-format. */ |
| 322 | |
| 323 | int multiple_frames; |
| 324 | |
| 325 | Lisp_Object Vglobal_mode_string; |
| 326 | |
| 327 | /* Marker for where to display an arrow on top of the buffer text. */ |
| 328 | |
| 329 | Lisp_Object Voverlay_arrow_position; |
| 330 | |
| 331 | /* String to display for the arrow. Only used on terminal frames. */ |
| 332 | |
| 333 | Lisp_Object Voverlay_arrow_string; |
| 334 | |
| 335 | /* Values of those variables at last redisplay. However, if |
| 336 | Voverlay_arrow_position is a marker, last_arrow_position is its |
| 337 | numerical position. */ |
| 338 | |
| 339 | static Lisp_Object last_arrow_position, last_arrow_string; |
| 340 | |
| 341 | /* Like mode-line-format, but for the title bar on a visible frame. */ |
| 342 | |
| 343 | Lisp_Object Vframe_title_format; |
| 344 | |
| 345 | /* Like mode-line-format, but for the title bar on an iconified frame. */ |
| 346 | |
| 347 | Lisp_Object Vicon_title_format; |
| 348 | |
| 349 | /* List of functions to call when a window's size changes. These |
| 350 | functions get one arg, a frame on which one or more windows' sizes |
| 351 | have changed. */ |
| 352 | |
| 353 | static Lisp_Object Vwindow_size_change_functions; |
| 354 | |
| 355 | Lisp_Object Qmenu_bar_update_hook; |
| 356 | |
| 357 | /* Nonzero if overlay arrow has been displayed once in this window. */ |
| 358 | |
| 359 | static int overlay_arrow_seen; |
| 360 | |
| 361 | /* Nonzero means highlight the region even in nonselected windows. */ |
| 362 | |
| 363 | int highlight_nonselected_windows; |
| 364 | |
| 365 | /* If cursor motion alone moves point off frame, try scrolling this |
| 366 | many lines up or down if that will bring it back. */ |
| 367 | |
| 368 | static int scroll_step; |
| 369 | |
| 370 | /* Non-0 means scroll just far enough to bring point back on the |
| 371 | screen, when appropriate. */ |
| 372 | |
| 373 | static int scroll_conservatively; |
| 374 | |
| 375 | /* Recenter the window whenever point gets within this many lines of |
| 376 | the top or bottom of the window. This value is translated into a |
| 377 | pixel value by multiplying it with CANON_Y_UNIT, which means that |
| 378 | there is really a fixed pixel height scroll margin. */ |
| 379 | |
| 380 | int scroll_margin; |
| 381 | |
| 382 | /* Number of windows showing the buffer of the selected window (or |
| 383 | another buffer with the same base buffer). keyboard.c refers to |
| 384 | this. */ |
| 385 | |
| 386 | int buffer_shared; |
| 387 | |
| 388 | /* Vector containing glyphs for an ellipsis `...'. */ |
| 389 | |
| 390 | static Lisp_Object default_invis_vector[3]; |
| 391 | |
| 392 | /* Nonzero means display mode line highlighted. */ |
| 393 | |
| 394 | int mode_line_inverse_video; |
| 395 | |
| 396 | /* Prompt to display in front of the mini-buffer contents. */ |
| 397 | |
| 398 | Lisp_Object minibuf_prompt; |
| 399 | |
| 400 | /* Width of current mini-buffer prompt. Only set after display_line |
| 401 | of the line that contains the prompt. */ |
| 402 | |
| 403 | int minibuf_prompt_width; |
| 404 | int minibuf_prompt_pixel_width; |
| 405 | |
| 406 | /* This is the window where the echo area message was displayed. It |
| 407 | is always a mini-buffer window, but it may not be the same window |
| 408 | currently active as a mini-buffer. */ |
| 409 | |
| 410 | Lisp_Object echo_area_window; |
| 411 | |
| 412 | /* List of pairs (MESSAGE . MULTIBYTE). The function save_message |
| 413 | pushes the current message and the value of |
| 414 | message_enable_multibyte on the stack, the function restore_message |
| 415 | pops the stack and displays MESSAGE again. */ |
| 416 | |
| 417 | Lisp_Object Vmessage_stack; |
| 418 | |
| 419 | /* Nonzero means multibyte characters were enabled when the echo area |
| 420 | message was specified. */ |
| 421 | |
| 422 | int message_enable_multibyte; |
| 423 | |
| 424 | /* True if we should redraw the mode lines on the next redisplay. */ |
| 425 | |
| 426 | int update_mode_lines; |
| 427 | |
| 428 | /* Nonzero if window sizes or contents have changed since last |
| 429 | redisplay that finished */ |
| 430 | |
| 431 | int windows_or_buffers_changed; |
| 432 | |
| 433 | /* Nonzero after display_mode_line if %l was used and it displayed a |
| 434 | line number. */ |
| 435 | |
| 436 | int line_number_displayed; |
| 437 | |
| 438 | /* Maximum buffer size for which to display line numbers. */ |
| 439 | |
| 440 | static int line_number_display_limit; |
| 441 | |
| 442 | /* line width to consider when repostioning for line number display */ |
| 443 | |
| 444 | static int line_number_display_limit_width; |
| 445 | |
| 446 | /* Number of lines to keep in the message log buffer. t means |
| 447 | infinite. nil means don't log at all. */ |
| 448 | |
| 449 | Lisp_Object Vmessage_log_max; |
| 450 | |
| 451 | /* Current, index 0, and last displayed echo area message. Either |
| 452 | buffers from echo_buffers, or nil to indicate no message. */ |
| 453 | |
| 454 | Lisp_Object echo_area_buffer[2]; |
| 455 | |
| 456 | /* The buffers referenced from echo_area_buffer. */ |
| 457 | |
| 458 | static Lisp_Object echo_buffer[2]; |
| 459 | |
| 460 | /* A vector saved used in with_area_buffer to reduce consing. */ |
| 461 | |
| 462 | static Lisp_Object Vwith_echo_area_save_vector; |
| 463 | |
| 464 | /* Non-zero means display_echo_area should display the last echo area |
| 465 | message again. Set by redisplay_preserve_echo_area. */ |
| 466 | |
| 467 | static int display_last_displayed_message_p; |
| 468 | |
| 469 | /* Nonzero if echo area is being used by print; zero if being used by |
| 470 | message. */ |
| 471 | |
| 472 | int message_buf_print; |
| 473 | |
| 474 | /* Maximum height for resizing mini-windows. Either a float |
| 475 | specifying a fraction of the available height, or an integer |
| 476 | specifying a number of lines. */ |
| 477 | |
| 478 | static Lisp_Object Vmax_mini_window_height; |
| 479 | |
| 480 | /* A scratch glyph row with contents used for generating truncation |
| 481 | glyphs. Also used in direct_output_for_insert. */ |
| 482 | |
| 483 | #define MAX_SCRATCH_GLYPHS 100 |
| 484 | struct glyph_row scratch_glyph_row; |
| 485 | static struct glyph scratch_glyphs[MAX_SCRATCH_GLYPHS]; |
| 486 | |
| 487 | /* Ascent and height of the last line processed by move_it_to. */ |
| 488 | |
| 489 | static int last_max_ascent, last_height; |
| 490 | |
| 491 | /* The maximum distance to look ahead for text properties. Values |
| 492 | that are too small let us call compute_char_face and similar |
| 493 | functions too often which is expensive. Values that are too large |
| 494 | let us call compute_char_face and alike too often because we |
| 495 | might not be interested in text properties that far away. */ |
| 496 | |
| 497 | #define TEXT_PROP_DISTANCE_LIMIT 100 |
| 498 | |
| 499 | /* Non-zero means print traces of redisplay if compiled with |
| 500 | GLYPH_DEBUG != 0. */ |
| 501 | |
| 502 | #if GLYPH_DEBUG |
| 503 | int trace_redisplay_p; |
| 504 | #endif |
| 505 | |
| 506 | /* Value returned from text property handlers (see below). */ |
| 507 | |
| 508 | enum prop_handled |
| 509 | { |
| 510 | HANDLED_NORMALLY, |
| 511 | HANDLED_RECOMPUTE_PROPS, |
| 512 | HANDLED_OVERLAY_STRING_CONSUMED, |
| 513 | HANDLED_RETURN |
| 514 | }; |
| 515 | |
| 516 | /* A description of text properties that redisplay is interested |
| 517 | in. */ |
| 518 | |
| 519 | struct props |
| 520 | { |
| 521 | /* The name of the property. */ |
| 522 | Lisp_Object *name; |
| 523 | |
| 524 | /* A unique index for the property. */ |
| 525 | enum prop_idx idx; |
| 526 | |
| 527 | /* A handler function called to set up iterator IT from the property |
| 528 | at IT's current position. Value is used to steer handle_stop. */ |
| 529 | enum prop_handled (*handler) P_ ((struct it *it)); |
| 530 | }; |
| 531 | |
| 532 | static enum prop_handled handle_face_prop P_ ((struct it *)); |
| 533 | static enum prop_handled handle_invisible_prop P_ ((struct it *)); |
| 534 | static enum prop_handled handle_display_prop P_ ((struct it *)); |
| 535 | static enum prop_handled handle_overlay_change P_ ((struct it *)); |
| 536 | static enum prop_handled handle_fontified_prop P_ ((struct it *)); |
| 537 | |
| 538 | /* Properties handled by iterators. */ |
| 539 | |
| 540 | static struct props it_props[] = |
| 541 | { |
| 542 | {&Qfontified, FONTIFIED_PROP_IDX, handle_fontified_prop}, |
| 543 | /* Handle `face' before `display' because some sub-properties of |
| 544 | `display' need to know the face. */ |
| 545 | {&Qface, FACE_PROP_IDX, handle_face_prop}, |
| 546 | {&Qdisplay, DISPLAY_PROP_IDX, handle_display_prop}, |
| 547 | {&Qinvisible, INVISIBLE_PROP_IDX, handle_invisible_prop}, |
| 548 | {NULL, 0, NULL} |
| 549 | }; |
| 550 | |
| 551 | /* Value is the position described by X. If X is a marker, value is |
| 552 | the marker_position of X. Otherwise, value is X. */ |
| 553 | |
| 554 | #define COERCE_MARKER(X) (MARKERP ((X)) ? Fmarker_position (X) : (X)) |
| 555 | |
| 556 | /* Enumeration returned by some move_it_.* functions internally. */ |
| 557 | |
| 558 | enum move_it_result |
| 559 | { |
| 560 | /* Not used. Undefined value. */ |
| 561 | MOVE_UNDEFINED, |
| 562 | |
| 563 | /* Move ended at the requested buffer position or ZV. */ |
| 564 | MOVE_POS_MATCH_OR_ZV, |
| 565 | |
| 566 | /* Move ended at the requested X pixel position. */ |
| 567 | MOVE_X_REACHED, |
| 568 | |
| 569 | /* Move within a line ended at the end of a line that must be |
| 570 | continued. */ |
| 571 | MOVE_LINE_CONTINUED, |
| 572 | |
| 573 | /* Move within a line ended at the end of a line that would |
| 574 | be displayed truncated. */ |
| 575 | MOVE_LINE_TRUNCATED, |
| 576 | |
| 577 | /* Move within a line ended at a line end. */ |
| 578 | MOVE_NEWLINE_OR_CR |
| 579 | }; |
| 580 | |
| 581 | |
| 582 | \f |
| 583 | /* Function prototypes. */ |
| 584 | |
| 585 | static struct glyph_row *row_containing_pos P_ ((struct window *, int, |
| 586 | struct glyph_row *, |
| 587 | struct glyph_row *)); |
| 588 | static Lisp_Object unwind_with_echo_area_buffer P_ ((Lisp_Object)); |
| 589 | static Lisp_Object with_echo_area_buffer_unwind_data P_ ((struct window *)); |
| 590 | static void clear_garbaged_frames P_ ((void)); |
| 591 | static int current_message_1 P_ ((Lisp_Object *)); |
| 592 | static int truncate_message_1 P_ ((int)); |
| 593 | static int set_message_1 P_ ((char *s, Lisp_Object, int, int)); |
| 594 | static int display_echo_area P_ ((struct window *)); |
| 595 | static int display_echo_area_1 P_ ((struct window *)); |
| 596 | static Lisp_Object unwind_redisplay P_ ((Lisp_Object)); |
| 597 | static int string_char_and_length P_ ((unsigned char *, int, int *)); |
| 598 | static struct text_pos display_prop_end P_ ((struct it *, Lisp_Object, |
| 599 | struct text_pos)); |
| 600 | static int compute_window_start_on_continuation_line P_ ((struct window *)); |
| 601 | static Lisp_Object eval_handler P_ ((Lisp_Object)); |
| 602 | static Lisp_Object eval_form P_ ((Lisp_Object)); |
| 603 | static void insert_left_trunc_glyphs P_ ((struct it *)); |
| 604 | static struct glyph_row *get_overlay_arrow_glyph_row P_ ((struct window *)); |
| 605 | static void extend_face_to_end_of_line P_ ((struct it *)); |
| 606 | static void append_space P_ ((struct it *, int)); |
| 607 | static void make_cursor_line_fully_visible P_ ((struct window *)); |
| 608 | static int try_scrolling P_ ((Lisp_Object, int, int, int, int)); |
| 609 | static int trailing_whitespace_p P_ ((int)); |
| 610 | static int message_log_check_duplicate P_ ((int, int, int, int)); |
| 611 | int invisible_p P_ ((Lisp_Object, Lisp_Object)); |
| 612 | int invisible_ellipsis_p P_ ((Lisp_Object, Lisp_Object)); |
| 613 | static void push_it P_ ((struct it *)); |
| 614 | static void pop_it P_ ((struct it *)); |
| 615 | static void sync_frame_with_window_matrix_rows P_ ((struct window *)); |
| 616 | static void redisplay_internal P_ ((int)); |
| 617 | static int echo_area_display P_ ((int)); |
| 618 | static void redisplay_windows P_ ((Lisp_Object)); |
| 619 | static void redisplay_window P_ ((Lisp_Object, int)); |
| 620 | static void update_menu_bar P_ ((struct frame *, int)); |
| 621 | static int try_window_reusing_current_matrix P_ ((struct window *)); |
| 622 | static int try_window_id P_ ((struct window *)); |
| 623 | static int display_line P_ ((struct it *)); |
| 624 | static void display_mode_lines P_ ((struct window *)); |
| 625 | static void display_mode_line P_ ((struct window *, enum face_id, |
| 626 | Lisp_Object)); |
| 627 | static int display_mode_element P_ ((struct it *, int, int, int, Lisp_Object)); |
| 628 | static char *decode_mode_spec P_ ((struct window *, int, int, int)); |
| 629 | static void display_menu_bar P_ ((struct window *)); |
| 630 | static int display_count_lines P_ ((int, int, int, int, int *)); |
| 631 | static int display_string P_ ((unsigned char *, Lisp_Object, Lisp_Object, |
| 632 | int, int, struct it *, int, int, int, int)); |
| 633 | static void compute_line_metrics P_ ((struct it *)); |
| 634 | static void run_redisplay_end_trigger_hook P_ ((struct it *)); |
| 635 | static int get_overlay_strings P_ ((struct it *)); |
| 636 | static void next_overlay_string P_ ((struct it *)); |
| 637 | void set_iterator_to_next P_ ((struct it *)); |
| 638 | static void reseat P_ ((struct it *, struct text_pos, int)); |
| 639 | static void reseat_1 P_ ((struct it *, struct text_pos, int)); |
| 640 | static void back_to_previous_visible_line_start P_ ((struct it *)); |
| 641 | static void reseat_at_previous_visible_line_start P_ ((struct it *)); |
| 642 | static void reseat_at_next_visible_line_start P_ ((struct it *, int)); |
| 643 | static int next_element_from_display_vector P_ ((struct it *)); |
| 644 | static int next_element_from_string P_ ((struct it *)); |
| 645 | static int next_element_from_c_string P_ ((struct it *)); |
| 646 | static int next_element_from_buffer P_ ((struct it *)); |
| 647 | static int next_element_from_image P_ ((struct it *)); |
| 648 | static int next_element_from_stretch P_ ((struct it *)); |
| 649 | static void load_overlay_strings P_ ((struct it *)); |
| 650 | static void init_from_display_pos P_ ((struct it *, struct window *, |
| 651 | struct display_pos *)); |
| 652 | static void reseat_to_string P_ ((struct it *, unsigned char *, |
| 653 | Lisp_Object, int, int, int, int)); |
| 654 | static int charset_at_position P_ ((struct text_pos)); |
| 655 | static enum move_it_result move_it_in_display_line_to P_ ((struct it *, |
| 656 | int, int, int)); |
| 657 | void move_it_vertically_backward P_ ((struct it *, int)); |
| 658 | static void init_to_row_start P_ ((struct it *, struct window *, |
| 659 | struct glyph_row *)); |
| 660 | static void init_to_row_end P_ ((struct it *, struct window *, |
| 661 | struct glyph_row *)); |
| 662 | static void back_to_previous_line_start P_ ((struct it *)); |
| 663 | static void forward_to_next_line_start P_ ((struct it *)); |
| 664 | static struct text_pos string_pos_nchars_ahead P_ ((struct text_pos, |
| 665 | Lisp_Object, int)); |
| 666 | static struct text_pos string_pos P_ ((int, Lisp_Object)); |
| 667 | static struct text_pos c_string_pos P_ ((int, unsigned char *, int)); |
| 668 | static int number_of_chars P_ ((unsigned char *, int)); |
| 669 | static void compute_stop_pos P_ ((struct it *)); |
| 670 | static void compute_string_pos P_ ((struct text_pos *, struct text_pos, |
| 671 | Lisp_Object)); |
| 672 | static int face_before_or_after_it_pos P_ ((struct it *, int)); |
| 673 | static int next_overlay_change P_ ((int)); |
| 674 | static int handle_single_display_prop P_ ((struct it *, Lisp_Object, |
| 675 | Lisp_Object, struct text_pos *)); |
| 676 | |
| 677 | #define face_before_it_pos(IT) face_before_or_after_it_pos ((IT), 1) |
| 678 | #define face_after_it_pos(IT) face_before_or_after_it_pos ((IT), 0) |
| 679 | |
| 680 | #ifdef HAVE_WINDOW_SYSTEM |
| 681 | |
| 682 | static void update_tool_bar P_ ((struct frame *, int)); |
| 683 | static void build_desired_tool_bar_string P_ ((struct frame *f)); |
| 684 | static int redisplay_tool_bar P_ ((struct frame *)); |
| 685 | static void display_tool_bar_line P_ ((struct it *)); |
| 686 | |
| 687 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 688 | |
| 689 | \f |
| 690 | /*********************************************************************** |
| 691 | Window display dimensions |
| 692 | ***********************************************************************/ |
| 693 | |
| 694 | /* Return the window-relative maximum y + 1 for glyph rows displaying |
| 695 | text in window W. This is the height of W minus the height of a |
| 696 | mode line, if any. */ |
| 697 | |
| 698 | INLINE int |
| 699 | window_text_bottom_y (w) |
| 700 | struct window *w; |
| 701 | { |
| 702 | struct frame *f = XFRAME (w->frame); |
| 703 | int height = XFASTINT (w->height) * CANON_Y_UNIT (f); |
| 704 | |
| 705 | if (WINDOW_WANTS_MODELINE_P (w)) |
| 706 | height -= CURRENT_MODE_LINE_HEIGHT (w); |
| 707 | return height; |
| 708 | } |
| 709 | |
| 710 | |
| 711 | /* Return the pixel width of display area AREA of window W. AREA < 0 |
| 712 | means return the total width of W, not including bitmap areas to |
| 713 | the left and right of the window. */ |
| 714 | |
| 715 | INLINE int |
| 716 | window_box_width (w, area) |
| 717 | struct window *w; |
| 718 | int area; |
| 719 | { |
| 720 | struct frame *f = XFRAME (w->frame); |
| 721 | int width = XFASTINT (w->width); |
| 722 | |
| 723 | if (!w->pseudo_window_p) |
| 724 | { |
| 725 | width -= FRAME_SCROLL_BAR_WIDTH (f) + FRAME_FLAGS_AREA_COLS (f); |
| 726 | |
| 727 | if (area == TEXT_AREA) |
| 728 | { |
| 729 | if (INTEGERP (w->left_margin_width)) |
| 730 | width -= XFASTINT (w->left_margin_width); |
| 731 | if (INTEGERP (w->right_margin_width)) |
| 732 | width -= XFASTINT (w->right_margin_width); |
| 733 | } |
| 734 | else if (area == LEFT_MARGIN_AREA) |
| 735 | width = (INTEGERP (w->left_margin_width) |
| 736 | ? XFASTINT (w->left_margin_width) : 0); |
| 737 | else if (area == RIGHT_MARGIN_AREA) |
| 738 | width = (INTEGERP (w->right_margin_width) |
| 739 | ? XFASTINT (w->right_margin_width) : 0); |
| 740 | } |
| 741 | |
| 742 | return width * CANON_X_UNIT (f); |
| 743 | } |
| 744 | |
| 745 | |
| 746 | /* Return the pixel height of the display area of window W, not |
| 747 | including mode lines of W, if any.. */ |
| 748 | |
| 749 | INLINE int |
| 750 | window_box_height (w) |
| 751 | struct window *w; |
| 752 | { |
| 753 | struct frame *f = XFRAME (w->frame); |
| 754 | int height = XFASTINT (w->height) * CANON_Y_UNIT (f); |
| 755 | |
| 756 | if (WINDOW_WANTS_MODELINE_P (w)) |
| 757 | height -= CURRENT_MODE_LINE_HEIGHT (w); |
| 758 | |
| 759 | if (WINDOW_WANTS_HEADER_LINE_P (w)) |
| 760 | height -= CURRENT_HEADER_LINE_HEIGHT (w); |
| 761 | |
| 762 | return height; |
| 763 | } |
| 764 | |
| 765 | |
| 766 | /* Return the frame-relative coordinate of the left edge of display |
| 767 | area AREA of window W. AREA < 0 means return the left edge of the |
| 768 | whole window, to the right of any bitmap area at the left side of |
| 769 | W. */ |
| 770 | |
| 771 | INLINE int |
| 772 | window_box_left (w, area) |
| 773 | struct window *w; |
| 774 | int area; |
| 775 | { |
| 776 | struct frame *f = XFRAME (w->frame); |
| 777 | int x = FRAME_INTERNAL_BORDER_WIDTH_SAFE (f); |
| 778 | |
| 779 | if (!w->pseudo_window_p) |
| 780 | { |
| 781 | x += (WINDOW_LEFT_MARGIN (w) * CANON_X_UNIT (f) |
| 782 | + FRAME_LEFT_FLAGS_AREA_WIDTH (f)); |
| 783 | |
| 784 | if (area == TEXT_AREA) |
| 785 | x += window_box_width (w, LEFT_MARGIN_AREA); |
| 786 | else if (area == RIGHT_MARGIN_AREA) |
| 787 | x += (window_box_width (w, LEFT_MARGIN_AREA) |
| 788 | + window_box_width (w, TEXT_AREA)); |
| 789 | } |
| 790 | |
| 791 | return x; |
| 792 | } |
| 793 | |
| 794 | |
| 795 | /* Return the frame-relative coordinate of the right edge of display |
| 796 | area AREA of window W. AREA < 0 means return the left edge of the |
| 797 | whole window, to the left of any bitmap area at the right side of |
| 798 | W. */ |
| 799 | |
| 800 | INLINE int |
| 801 | window_box_right (w, area) |
| 802 | struct window *w; |
| 803 | int area; |
| 804 | { |
| 805 | return window_box_left (w, area) + window_box_width (w, area); |
| 806 | } |
| 807 | |
| 808 | |
| 809 | /* Get the bounding box of the display area AREA of window W, without |
| 810 | mode lines, in frame-relative coordinates. AREA < 0 means the |
| 811 | whole window, not including bitmap areas to the left and right of |
| 812 | the window. Return in *BOX_X and *BOX_Y the frame-relative pixel |
| 813 | coordinates of the upper-left corner of the box. Return in |
| 814 | *BOX_WIDTH, and *BOX_HEIGHT the pixel width and height of the box. */ |
| 815 | |
| 816 | INLINE void |
| 817 | window_box (w, area, box_x, box_y, box_width, box_height) |
| 818 | struct window *w; |
| 819 | int area; |
| 820 | int *box_x, *box_y, *box_width, *box_height; |
| 821 | { |
| 822 | struct frame *f = XFRAME (w->frame); |
| 823 | |
| 824 | *box_width = window_box_width (w, area); |
| 825 | *box_height = window_box_height (w); |
| 826 | *box_x = window_box_left (w, area); |
| 827 | *box_y = (FRAME_INTERNAL_BORDER_WIDTH_SAFE (f) |
| 828 | + XFASTINT (w->top) * CANON_Y_UNIT (f)); |
| 829 | if (WINDOW_WANTS_HEADER_LINE_P (w)) |
| 830 | *box_y += CURRENT_HEADER_LINE_HEIGHT (w); |
| 831 | } |
| 832 | |
| 833 | |
| 834 | /* Get the bounding box of the display area AREA of window W, without |
| 835 | mode lines. AREA < 0 means the whole window, not including bitmap |
| 836 | areas to the left and right of the window. Return in *TOP_LEFT_X |
| 837 | and TOP_LEFT_Y the frame-relative pixel coordinates of the |
| 838 | upper-left corner of the box. Return in *BOTTOM_RIGHT_X, and |
| 839 | *BOTTOM_RIGHT_Y the coordinates of the bottom-right corner of the |
| 840 | box. */ |
| 841 | |
| 842 | INLINE void |
| 843 | window_box_edges (w, area, top_left_x, top_left_y, |
| 844 | bottom_right_x, bottom_right_y) |
| 845 | struct window *w; |
| 846 | int area; |
| 847 | int *top_left_x, *top_left_y, *bottom_right_x, *bottom_right_y; |
| 848 | { |
| 849 | window_box (w, area, top_left_x, top_left_y, bottom_right_x, |
| 850 | bottom_right_y); |
| 851 | *bottom_right_x += *top_left_x; |
| 852 | *bottom_right_y += *top_left_y; |
| 853 | } |
| 854 | |
| 855 | |
| 856 | \f |
| 857 | /*********************************************************************** |
| 858 | Utilities |
| 859 | ***********************************************************************/ |
| 860 | |
| 861 | /* Return the next character from STR which is MAXLEN bytes long. |
| 862 | Return in *LEN the length of the character. This is like |
| 863 | STRING_CHAR_AND_LENGTH but never returns an invalid character. If |
| 864 | we find one, we return a `?', but with the length of the illegal |
| 865 | character. */ |
| 866 | |
| 867 | static INLINE int |
| 868 | string_char_and_length (str, maxlen, len) |
| 869 | unsigned char *str; |
| 870 | int maxlen, *len; |
| 871 | { |
| 872 | int c; |
| 873 | |
| 874 | c = STRING_CHAR_AND_LENGTH (str, maxlen, *len); |
| 875 | if (!CHAR_VALID_P (c, 1)) |
| 876 | /* We may not change the length here because other places in Emacs |
| 877 | don't use this function, i.e. they silently accept illegal |
| 878 | characters. */ |
| 879 | c = '?'; |
| 880 | |
| 881 | return c; |
| 882 | } |
| 883 | |
| 884 | |
| 885 | |
| 886 | /* Given a position POS containing a valid character and byte position |
| 887 | in STRING, return the position NCHARS ahead (NCHARS >= 0). */ |
| 888 | |
| 889 | static struct text_pos |
| 890 | string_pos_nchars_ahead (pos, string, nchars) |
| 891 | struct text_pos pos; |
| 892 | Lisp_Object string; |
| 893 | int nchars; |
| 894 | { |
| 895 | xassert (STRINGP (string) && nchars >= 0); |
| 896 | |
| 897 | if (STRING_MULTIBYTE (string)) |
| 898 | { |
| 899 | int rest = STRING_BYTES (XSTRING (string)) - BYTEPOS (pos); |
| 900 | unsigned char *p = XSTRING (string)->data + BYTEPOS (pos); |
| 901 | int len; |
| 902 | |
| 903 | while (nchars--) |
| 904 | { |
| 905 | string_char_and_length (p, rest, &len); |
| 906 | p += len, rest -= len; |
| 907 | xassert (rest >= 0); |
| 908 | CHARPOS (pos) += 1; |
| 909 | BYTEPOS (pos) += len; |
| 910 | } |
| 911 | } |
| 912 | else |
| 913 | SET_TEXT_POS (pos, CHARPOS (pos) + nchars, BYTEPOS (pos) + nchars); |
| 914 | |
| 915 | return pos; |
| 916 | } |
| 917 | |
| 918 | |
| 919 | /* Value is the text position, i.e. character and byte position, |
| 920 | for character position CHARPOS in STRING. */ |
| 921 | |
| 922 | static INLINE struct text_pos |
| 923 | string_pos (charpos, string) |
| 924 | int charpos; |
| 925 | Lisp_Object string; |
| 926 | { |
| 927 | struct text_pos pos; |
| 928 | xassert (STRINGP (string)); |
| 929 | xassert (charpos >= 0); |
| 930 | SET_TEXT_POS (pos, charpos, string_char_to_byte (string, charpos)); |
| 931 | return pos; |
| 932 | } |
| 933 | |
| 934 | |
| 935 | /* Value is a text position, i.e. character and byte position, for |
| 936 | character position CHARPOS in C string S. MULTIBYTE_P non-zero |
| 937 | means recognize multibyte characters. */ |
| 938 | |
| 939 | static struct text_pos |
| 940 | c_string_pos (charpos, s, multibyte_p) |
| 941 | int charpos; |
| 942 | unsigned char *s; |
| 943 | int multibyte_p; |
| 944 | { |
| 945 | struct text_pos pos; |
| 946 | |
| 947 | xassert (s != NULL); |
| 948 | xassert (charpos >= 0); |
| 949 | |
| 950 | if (multibyte_p) |
| 951 | { |
| 952 | int rest = strlen (s), len; |
| 953 | |
| 954 | SET_TEXT_POS (pos, 0, 0); |
| 955 | while (charpos--) |
| 956 | { |
| 957 | string_char_and_length (s, rest, &len); |
| 958 | s += len, rest -= len; |
| 959 | xassert (rest >= 0); |
| 960 | CHARPOS (pos) += 1; |
| 961 | BYTEPOS (pos) += len; |
| 962 | } |
| 963 | } |
| 964 | else |
| 965 | SET_TEXT_POS (pos, charpos, charpos); |
| 966 | |
| 967 | return pos; |
| 968 | } |
| 969 | |
| 970 | |
| 971 | /* Value is the number of characters in C string S. MULTIBYTE_P |
| 972 | non-zero means recognize multibyte characters. */ |
| 973 | |
| 974 | static int |
| 975 | number_of_chars (s, multibyte_p) |
| 976 | unsigned char *s; |
| 977 | int multibyte_p; |
| 978 | { |
| 979 | int nchars; |
| 980 | |
| 981 | if (multibyte_p) |
| 982 | { |
| 983 | int rest = strlen (s), len; |
| 984 | unsigned char *p = (unsigned char *) s; |
| 985 | |
| 986 | for (nchars = 0; rest > 0; ++nchars) |
| 987 | { |
| 988 | string_char_and_length (p, rest, &len); |
| 989 | rest -= len, p += len; |
| 990 | } |
| 991 | } |
| 992 | else |
| 993 | nchars = strlen (s); |
| 994 | |
| 995 | return nchars; |
| 996 | } |
| 997 | |
| 998 | |
| 999 | /* Compute byte position NEWPOS->bytepos corresponding to |
| 1000 | NEWPOS->charpos. POS is a known position in string STRING. |
| 1001 | NEWPOS->charpos must be >= POS.charpos. */ |
| 1002 | |
| 1003 | static void |
| 1004 | compute_string_pos (newpos, pos, string) |
| 1005 | struct text_pos *newpos, pos; |
| 1006 | Lisp_Object string; |
| 1007 | { |
| 1008 | xassert (STRINGP (string)); |
| 1009 | xassert (CHARPOS (*newpos) >= CHARPOS (pos)); |
| 1010 | |
| 1011 | if (STRING_MULTIBYTE (string)) |
| 1012 | *newpos = string_pos_nchars_ahead (pos, CHARPOS (*newpos) - CHARPOS (pos), |
| 1013 | string); |
| 1014 | else |
| 1015 | BYTEPOS (*newpos) = CHARPOS (*newpos); |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | /* Return the charset of the character at position POS in |
| 1020 | current_buffer. */ |
| 1021 | |
| 1022 | static int |
| 1023 | charset_at_position (pos) |
| 1024 | struct text_pos pos; |
| 1025 | { |
| 1026 | int c, multibyte_p; |
| 1027 | unsigned char *p = BYTE_POS_ADDR (BYTEPOS (pos)); |
| 1028 | |
| 1029 | multibyte_p = !NILP (current_buffer->enable_multibyte_characters); |
| 1030 | if (multibyte_p) |
| 1031 | { |
| 1032 | int maxlen = ((BYTEPOS (pos) >= GPT_BYTE ? ZV_BYTE : GPT_BYTE) |
| 1033 | - BYTEPOS (pos)); |
| 1034 | int len; |
| 1035 | c = string_char_and_length (p, maxlen, &len); |
| 1036 | } |
| 1037 | else |
| 1038 | c = *p; |
| 1039 | |
| 1040 | return CHAR_CHARSET (c); |
| 1041 | } |
| 1042 | |
| 1043 | |
| 1044 | \f |
| 1045 | /*********************************************************************** |
| 1046 | Lisp form evaluation |
| 1047 | ***********************************************************************/ |
| 1048 | |
| 1049 | /* Error handler for eval_form. */ |
| 1050 | |
| 1051 | static Lisp_Object |
| 1052 | eval_handler (arg) |
| 1053 | Lisp_Object arg; |
| 1054 | { |
| 1055 | return Qnil; |
| 1056 | } |
| 1057 | |
| 1058 | |
| 1059 | /* Evaluate SEXPR and return the result, or nil if something went |
| 1060 | wrong. */ |
| 1061 | |
| 1062 | static Lisp_Object |
| 1063 | eval_form (sexpr) |
| 1064 | Lisp_Object sexpr; |
| 1065 | { |
| 1066 | int count = specpdl_ptr - specpdl; |
| 1067 | Lisp_Object val; |
| 1068 | specbind (Qinhibit_redisplay, Qt); |
| 1069 | val = internal_condition_case_1 (Feval, sexpr, Qerror, eval_handler); |
| 1070 | return unbind_to (count, val); |
| 1071 | } |
| 1072 | |
| 1073 | |
| 1074 | \f |
| 1075 | /*********************************************************************** |
| 1076 | Debugging |
| 1077 | ***********************************************************************/ |
| 1078 | |
| 1079 | #if 0 |
| 1080 | |
| 1081 | /* Define CHECK_IT to perform sanity checks on iterators. |
| 1082 | This is for debugging. It is too slow to do unconditionally. */ |
| 1083 | |
| 1084 | static void |
| 1085 | check_it (it) |
| 1086 | struct it *it; |
| 1087 | { |
| 1088 | if (it->method == next_element_from_string) |
| 1089 | { |
| 1090 | xassert (STRINGP (it->string)); |
| 1091 | xassert (IT_STRING_CHARPOS (*it) >= 0); |
| 1092 | } |
| 1093 | else if (it->method == next_element_from_buffer) |
| 1094 | { |
| 1095 | /* Check that character and byte positions agree. */ |
| 1096 | xassert (IT_CHARPOS (*it) == BYTE_TO_CHAR (IT_BYTEPOS (*it))); |
| 1097 | } |
| 1098 | |
| 1099 | if (it->dpvec) |
| 1100 | xassert (it->current.dpvec_index >= 0); |
| 1101 | else |
| 1102 | xassert (it->current.dpvec_index < 0); |
| 1103 | } |
| 1104 | |
| 1105 | #define CHECK_IT(IT) check_it ((IT)) |
| 1106 | |
| 1107 | #else /* not 0 */ |
| 1108 | |
| 1109 | #define CHECK_IT(IT) (void) 0 |
| 1110 | |
| 1111 | #endif /* not 0 */ |
| 1112 | |
| 1113 | |
| 1114 | #if GLYPH_DEBUG |
| 1115 | |
| 1116 | /* Check that the window end of window W is what we expect it |
| 1117 | to be---the last row in the current matrix displaying text. */ |
| 1118 | |
| 1119 | static void |
| 1120 | check_window_end (w) |
| 1121 | struct window *w; |
| 1122 | { |
| 1123 | if (!MINI_WINDOW_P (w) |
| 1124 | && !NILP (w->window_end_valid)) |
| 1125 | { |
| 1126 | struct glyph_row *row; |
| 1127 | xassert ((row = MATRIX_ROW (w->current_matrix, |
| 1128 | XFASTINT (w->window_end_vpos)), |
| 1129 | !row->enabled_p |
| 1130 | || MATRIX_ROW_DISPLAYS_TEXT_P (row) |
| 1131 | || MATRIX_ROW_VPOS (row, w->current_matrix) == 0)); |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | #define CHECK_WINDOW_END(W) check_window_end ((W)) |
| 1136 | |
| 1137 | #else /* not GLYPH_DEBUG */ |
| 1138 | |
| 1139 | #define CHECK_WINDOW_END(W) (void) 0 |
| 1140 | |
| 1141 | #endif /* not GLYPH_DEBUG */ |
| 1142 | |
| 1143 | |
| 1144 | \f |
| 1145 | /*********************************************************************** |
| 1146 | Iterator initialization |
| 1147 | ***********************************************************************/ |
| 1148 | |
| 1149 | /* Initialize IT for displaying current_buffer in window W, starting |
| 1150 | at character position CHARPOS. CHARPOS < 0 means that no buffer |
| 1151 | position is specified which is useful when the iterator is assigned |
| 1152 | a position later. BYTEPOS is the byte position corresponding to |
| 1153 | CHARPOS. BYTEPOS <= 0 means compute it from CHARPOS. |
| 1154 | |
| 1155 | If ROW is not null, calls to produce_glyphs with IT as parameter |
| 1156 | will produce glyphs in that row. |
| 1157 | |
| 1158 | BASE_FACE_ID is the id of a base face to use. It must be one of |
| 1159 | DEFAULT_FACE_ID for normal text, MODE_LINE_FACE_ID or |
| 1160 | HEADER_LINE_FACE_ID for displaying mode lines, or TOOL_BAR_FACE_ID for |
| 1161 | displaying the tool-bar. |
| 1162 | |
| 1163 | If ROW is null and BASE_FACE_ID is equal to MODE_LINE_FACE_ID or |
| 1164 | HEADER_LINE_FACE_ID, the iterator will be initialized to use the |
| 1165 | corresponding mode line glyph row of the desired matrix of W. */ |
| 1166 | |
| 1167 | void |
| 1168 | init_iterator (it, w, charpos, bytepos, row, base_face_id) |
| 1169 | struct it *it; |
| 1170 | struct window *w; |
| 1171 | int charpos, bytepos; |
| 1172 | struct glyph_row *row; |
| 1173 | enum face_id base_face_id; |
| 1174 | { |
| 1175 | int highlight_region_p; |
| 1176 | |
| 1177 | /* Some precondition checks. */ |
| 1178 | xassert (w != NULL && it != NULL); |
| 1179 | xassert (charpos < 0 || (charpos > 0 && charpos <= ZV)); |
| 1180 | |
| 1181 | /* If face attributes have been changed since the last redisplay, |
| 1182 | free realized faces now because they depend on face definitions |
| 1183 | that might have changed. */ |
| 1184 | if (face_change_count) |
| 1185 | { |
| 1186 | face_change_count = 0; |
| 1187 | free_all_realized_faces (Qnil); |
| 1188 | } |
| 1189 | |
| 1190 | /* Use one of the mode line rows of W's desired matrix if |
| 1191 | appropriate. */ |
| 1192 | if (row == NULL) |
| 1193 | { |
| 1194 | if (base_face_id == MODE_LINE_FACE_ID) |
| 1195 | row = MATRIX_MODE_LINE_ROW (w->desired_matrix); |
| 1196 | else if (base_face_id == HEADER_LINE_FACE_ID) |
| 1197 | row = MATRIX_HEADER_LINE_ROW (w->desired_matrix); |
| 1198 | } |
| 1199 | |
| 1200 | /* Clear IT. */ |
| 1201 | bzero (it, sizeof *it); |
| 1202 | it->current.overlay_string_index = -1; |
| 1203 | it->current.dpvec_index = -1; |
| 1204 | it->charset = CHARSET_ASCII; |
| 1205 | it->base_face_id = base_face_id; |
| 1206 | |
| 1207 | /* The window in which we iterate over current_buffer: */ |
| 1208 | XSETWINDOW (it->window, w); |
| 1209 | it->w = w; |
| 1210 | it->f = XFRAME (w->frame); |
| 1211 | |
| 1212 | /* If realized faces have been removed, e.g. because of face |
| 1213 | attribute changes of named faces, recompute them. */ |
| 1214 | if (FRAME_FACE_CACHE (it->f)->used == 0) |
| 1215 | recompute_basic_faces (it->f); |
| 1216 | |
| 1217 | /* Current value of the `space-width', and 'height' properties. */ |
| 1218 | it->space_width = Qnil; |
| 1219 | it->font_height = Qnil; |
| 1220 | |
| 1221 | /* Are control characters displayed as `^C'? */ |
| 1222 | it->ctl_arrow_p = !NILP (current_buffer->ctl_arrow); |
| 1223 | |
| 1224 | /* -1 means everything between a CR and the following line end |
| 1225 | is invisible. >0 means lines indented more than this value are |
| 1226 | invisible. */ |
| 1227 | it->selective = (INTEGERP (current_buffer->selective_display) |
| 1228 | ? XFASTINT (current_buffer->selective_display) |
| 1229 | : (!NILP (current_buffer->selective_display) |
| 1230 | ? -1 : 0)); |
| 1231 | it->selective_display_ellipsis_p |
| 1232 | = !NILP (current_buffer->selective_display_ellipses); |
| 1233 | |
| 1234 | /* Display table to use. */ |
| 1235 | it->dp = window_display_table (w); |
| 1236 | |
| 1237 | /* Are multibyte characters enabled in current_buffer? */ |
| 1238 | it->multibyte_p = !NILP (current_buffer->enable_multibyte_characters); |
| 1239 | |
| 1240 | /* Non-zero if we should highlight the region. */ |
| 1241 | highlight_region_p |
| 1242 | = (!NILP (Vtransient_mark_mode) |
| 1243 | && !NILP (current_buffer->mark_active) |
| 1244 | && XMARKER (current_buffer->mark)->buffer != 0); |
| 1245 | |
| 1246 | /* Set IT->region_beg_charpos and IT->region_end_charpos to the |
| 1247 | start and end of a visible region in window IT->w. Set both to |
| 1248 | -1 to indicate no region. */ |
| 1249 | if (highlight_region_p |
| 1250 | /* Maybe highlight only in selected window. */ |
| 1251 | && (/* Either show region everywhere. */ |
| 1252 | highlight_nonselected_windows |
| 1253 | /* Or show region in the selected window. */ |
| 1254 | || w == XWINDOW (selected_window) |
| 1255 | /* Or show the region if we are in the mini-buffer and W is |
| 1256 | the window the mini-buffer refers to. */ |
| 1257 | || (MINI_WINDOW_P (XWINDOW (selected_window)) |
| 1258 | && w == XWINDOW (Vminibuf_scroll_window)))) |
| 1259 | { |
| 1260 | int charpos = marker_position (current_buffer->mark); |
| 1261 | it->region_beg_charpos = min (PT, charpos); |
| 1262 | it->region_end_charpos = max (PT, charpos); |
| 1263 | } |
| 1264 | else |
| 1265 | it->region_beg_charpos = it->region_end_charpos = -1; |
| 1266 | |
| 1267 | /* Get the position at which the redisplay_end_trigger hook should |
| 1268 | be run, if it is to be run at all. */ |
| 1269 | if (MARKERP (w->redisplay_end_trigger) |
| 1270 | && XMARKER (w->redisplay_end_trigger)->buffer != 0) |
| 1271 | it->redisplay_end_trigger_charpos |
| 1272 | = marker_position (w->redisplay_end_trigger); |
| 1273 | else if (INTEGERP (w->redisplay_end_trigger)) |
| 1274 | it->redisplay_end_trigger_charpos = XINT (w->redisplay_end_trigger); |
| 1275 | |
| 1276 | /* Correct bogus values of tab_width. */ |
| 1277 | it->tab_width = XINT (current_buffer->tab_width); |
| 1278 | if (it->tab_width <= 0 || it->tab_width > 1000) |
| 1279 | it->tab_width = 8; |
| 1280 | |
| 1281 | /* Are lines in the display truncated? */ |
| 1282 | it->truncate_lines_p |
| 1283 | = (base_face_id != DEFAULT_FACE_ID |
| 1284 | || XINT (it->w->hscroll) |
| 1285 | || (truncate_partial_width_windows |
| 1286 | && !WINDOW_FULL_WIDTH_P (it->w)) |
| 1287 | || !NILP (current_buffer->truncate_lines)); |
| 1288 | |
| 1289 | /* Get dimensions of truncation and continuation glyphs. These are |
| 1290 | displayed as bitmaps under X, so we don't need them for such |
| 1291 | frames. */ |
| 1292 | if (!FRAME_WINDOW_P (it->f)) |
| 1293 | { |
| 1294 | if (it->truncate_lines_p) |
| 1295 | { |
| 1296 | /* We will need the truncation glyph. */ |
| 1297 | xassert (it->glyph_row == NULL); |
| 1298 | produce_special_glyphs (it, IT_TRUNCATION); |
| 1299 | it->truncation_pixel_width = it->pixel_width; |
| 1300 | } |
| 1301 | else |
| 1302 | { |
| 1303 | /* We will need the continuation glyph. */ |
| 1304 | xassert (it->glyph_row == NULL); |
| 1305 | produce_special_glyphs (it, IT_CONTINUATION); |
| 1306 | it->continuation_pixel_width = it->pixel_width; |
| 1307 | } |
| 1308 | |
| 1309 | /* Reset these values to zero becaue the produce_special_glyphs |
| 1310 | above has changed them. */ |
| 1311 | it->pixel_width = it->ascent = it->descent = 0; |
| 1312 | it->phys_ascent = it->phys_descent = 0; |
| 1313 | } |
| 1314 | |
| 1315 | /* Set this after getting the dimensions of truncation and |
| 1316 | continuation glyphs, so that we don't produce glyphs when calling |
| 1317 | produce_special_glyphs, above. */ |
| 1318 | it->glyph_row = row; |
| 1319 | it->area = TEXT_AREA; |
| 1320 | |
| 1321 | /* Get the dimensions of the display area. The display area |
| 1322 | consists of the visible window area plus a horizontally scrolled |
| 1323 | part to the left of the window. All x-values are relative to the |
| 1324 | start of this total display area. */ |
| 1325 | if (base_face_id != DEFAULT_FACE_ID) |
| 1326 | { |
| 1327 | /* Mode lines, menu bar in terminal frames. */ |
| 1328 | it->first_visible_x = 0; |
| 1329 | it->last_visible_x = XFASTINT (w->width) * CANON_X_UNIT (it->f); |
| 1330 | } |
| 1331 | else |
| 1332 | { |
| 1333 | it->first_visible_x |
| 1334 | = XFASTINT (it->w->hscroll) * CANON_X_UNIT (it->f); |
| 1335 | it->last_visible_x = (it->first_visible_x |
| 1336 | + window_box_width (w, TEXT_AREA)); |
| 1337 | |
| 1338 | /* If we truncate lines, leave room for the truncator glyph(s) at |
| 1339 | the right margin. Otherwise, leave room for the continuation |
| 1340 | glyph(s). Truncation and continuation glyphs are not inserted |
| 1341 | for window-based redisplay. */ |
| 1342 | if (!FRAME_WINDOW_P (it->f)) |
| 1343 | { |
| 1344 | if (it->truncate_lines_p) |
| 1345 | it->last_visible_x -= it->truncation_pixel_width; |
| 1346 | else |
| 1347 | it->last_visible_x -= it->continuation_pixel_width; |
| 1348 | } |
| 1349 | |
| 1350 | it->header_line_p = WINDOW_WANTS_HEADER_LINE_P (w); |
| 1351 | it->current_y = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w) + w->vscroll; |
| 1352 | } |
| 1353 | |
| 1354 | /* Leave room for a border glyph. */ |
| 1355 | if (!FRAME_WINDOW_P (it->f) |
| 1356 | && !WINDOW_RIGHTMOST_P (it->w)) |
| 1357 | it->last_visible_x -= 1; |
| 1358 | |
| 1359 | it->last_visible_y = window_text_bottom_y (w); |
| 1360 | |
| 1361 | /* For mode lines and alike, arrange for the first glyph having a |
| 1362 | left box line if the face specifies a box. */ |
| 1363 | if (base_face_id != DEFAULT_FACE_ID) |
| 1364 | { |
| 1365 | struct face *face; |
| 1366 | |
| 1367 | it->face_id = base_face_id; |
| 1368 | |
| 1369 | /* If we have a boxed mode line, make the first character appear |
| 1370 | with a left box line. */ |
| 1371 | face = FACE_FROM_ID (it->f, base_face_id); |
| 1372 | if (face->box != FACE_NO_BOX) |
| 1373 | it->start_of_box_run_p = 1; |
| 1374 | } |
| 1375 | |
| 1376 | /* If a buffer position was specified, set the iterator there, |
| 1377 | getting overlays and face properties from that position. */ |
| 1378 | if (charpos > 0) |
| 1379 | { |
| 1380 | it->end_charpos = ZV; |
| 1381 | it->face_id = -1; |
| 1382 | IT_CHARPOS (*it) = charpos; |
| 1383 | |
| 1384 | /* Compute byte position if not specified. */ |
| 1385 | if (bytepos <= 0) |
| 1386 | IT_BYTEPOS (*it) = CHAR_TO_BYTE (charpos); |
| 1387 | else |
| 1388 | IT_BYTEPOS (*it) = bytepos; |
| 1389 | |
| 1390 | /* Compute faces etc. */ |
| 1391 | reseat (it, it->current.pos, 1); |
| 1392 | } |
| 1393 | |
| 1394 | CHECK_IT (it); |
| 1395 | } |
| 1396 | |
| 1397 | |
| 1398 | /* Initialize IT for the display of window W with window start POS. */ |
| 1399 | |
| 1400 | void |
| 1401 | start_display (it, w, pos) |
| 1402 | struct it *it; |
| 1403 | struct window *w; |
| 1404 | struct text_pos pos; |
| 1405 | { |
| 1406 | int start_at_line_beg_p; |
| 1407 | struct glyph_row *row; |
| 1408 | int first_vpos = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0; |
| 1409 | int first_y; |
| 1410 | |
| 1411 | row = w->desired_matrix->rows + first_vpos; |
| 1412 | init_iterator (it, w, CHARPOS (pos), BYTEPOS (pos), row, DEFAULT_FACE_ID); |
| 1413 | first_y = it->current_y; |
| 1414 | |
| 1415 | /* If window start is not at a line start, move back to the line |
| 1416 | start. This makes sure that we take continuation lines into |
| 1417 | account. */ |
| 1418 | start_at_line_beg_p = (CHARPOS (pos) == BEGV |
| 1419 | || FETCH_BYTE (BYTEPOS (pos) - 1) == '\n'); |
| 1420 | if (!start_at_line_beg_p) |
| 1421 | reseat_at_previous_visible_line_start (it); |
| 1422 | |
| 1423 | /* If window start is not at a line start, skip forward to POS to |
| 1424 | get the correct continuation_lines_width and current_x. */ |
| 1425 | if (!start_at_line_beg_p) |
| 1426 | { |
| 1427 | move_it_to (it, CHARPOS (pos), -1, -1, -1, MOVE_TO_POS); |
| 1428 | |
| 1429 | /* If lines are continued, this line may end in the middle of a |
| 1430 | multi-glyph character (e.g. a control character displayed as |
| 1431 | \003, or in the middle of an overlay string). In this case |
| 1432 | move_it_to above will not have taken us to the start of |
| 1433 | the continuation line but to the end of the continued line. */ |
| 1434 | if (!it->truncate_lines_p && it->current_x > 0) |
| 1435 | { |
| 1436 | if (it->current.dpvec_index >= 0 |
| 1437 | || it->current.overlay_string_index >= 0) |
| 1438 | { |
| 1439 | set_iterator_to_next (it); |
| 1440 | move_it_in_display_line_to (it, -1, -1, 0); |
| 1441 | } |
| 1442 | it->continuation_lines_width += it->current_x; |
| 1443 | } |
| 1444 | |
| 1445 | it->current_y = first_y; |
| 1446 | it->vpos = 0; |
| 1447 | it->current_x = it->hpos = 0; |
| 1448 | } |
| 1449 | |
| 1450 | #if 0 /* Don't assert the following because start_display is sometimes |
| 1451 | called intentionally with a window start that is not at a |
| 1452 | line start. Please leave this code in as a comment. */ |
| 1453 | |
| 1454 | /* Window start should be on a line start, now. */ |
| 1455 | xassert (it->continuation_lines_width |
| 1456 | || IT_CHARPOS (it) == BEGV |
| 1457 | || FETCH_BYTE (IT_BYTEPOS (it) - 1) == '\n'); |
| 1458 | #endif /* 0 */ |
| 1459 | } |
| 1460 | |
| 1461 | |
| 1462 | /* Initialize IT for stepping through current_buffer in window W, |
| 1463 | starting at position POS that includes overlay string and display |
| 1464 | vector/ control character translation position information. */ |
| 1465 | |
| 1466 | static void |
| 1467 | init_from_display_pos (it, w, pos) |
| 1468 | struct it *it; |
| 1469 | struct window *w; |
| 1470 | struct display_pos *pos; |
| 1471 | { |
| 1472 | /* Keep in mind: the call to reseat in init_iterator skips invisible |
| 1473 | text, so we might end up at a position different from POS. This |
| 1474 | is only a problem when POS is a row start after a newline and an |
| 1475 | overlay starts there with an after-string, and the overlay has an |
| 1476 | invisible property. Since we don't skip invisible text in |
| 1477 | display_line and elsewhere immediately after consuming the |
| 1478 | newline before the row start, such a POS will not be in a string, |
| 1479 | but the call to init_iterator below will move us to the |
| 1480 | after-string. */ |
| 1481 | init_iterator (it, w, CHARPOS (pos->pos), BYTEPOS (pos->pos), |
| 1482 | NULL, DEFAULT_FACE_ID); |
| 1483 | |
| 1484 | /* If position is within an overlay string, set up IT to |
| 1485 | the right overlay string. */ |
| 1486 | if (pos->overlay_string_index >= 0) |
| 1487 | { |
| 1488 | int relative_index; |
| 1489 | |
| 1490 | /* We already have the first chunk of overlay strings in |
| 1491 | IT->overlay_strings. Load more until the one for |
| 1492 | pos->overlay_string_index is in IT->overlay_strings. */ |
| 1493 | if (pos->overlay_string_index >= OVERLAY_STRING_CHUNK_SIZE) |
| 1494 | { |
| 1495 | int n = pos->overlay_string_index / OVERLAY_STRING_CHUNK_SIZE; |
| 1496 | it->current.overlay_string_index = 0; |
| 1497 | while (n--) |
| 1498 | { |
| 1499 | load_overlay_strings (it); |
| 1500 | it->current.overlay_string_index += OVERLAY_STRING_CHUNK_SIZE; |
| 1501 | } |
| 1502 | } |
| 1503 | |
| 1504 | it->current.overlay_string_index = pos->overlay_string_index; |
| 1505 | relative_index = (it->current.overlay_string_index |
| 1506 | % OVERLAY_STRING_CHUNK_SIZE); |
| 1507 | it->string = it->overlay_strings[relative_index]; |
| 1508 | it->current.string_pos = pos->string_pos; |
| 1509 | it->method = next_element_from_string; |
| 1510 | } |
| 1511 | else if (CHARPOS (pos->string_pos) >= 0) |
| 1512 | { |
| 1513 | /* Recorded position is not in an overlay string, but in another |
| 1514 | string. This can only be a string from a `display' property. |
| 1515 | IT should already be filled with that string. */ |
| 1516 | it->current.string_pos = pos->string_pos; |
| 1517 | xassert (STRINGP (it->string)); |
| 1518 | } |
| 1519 | |
| 1520 | /* Restore position in display vector translations or control |
| 1521 | character translations. */ |
| 1522 | if (pos->dpvec_index >= 0) |
| 1523 | { |
| 1524 | /* This fills IT->dpvec. */ |
| 1525 | get_next_display_element (it); |
| 1526 | xassert (it->dpvec && it->current.dpvec_index == 0); |
| 1527 | it->current.dpvec_index = pos->dpvec_index; |
| 1528 | } |
| 1529 | |
| 1530 | CHECK_IT (it); |
| 1531 | } |
| 1532 | |
| 1533 | |
| 1534 | /* Initialize IT for stepping through current_buffer in window W |
| 1535 | starting at ROW->start. */ |
| 1536 | |
| 1537 | static void |
| 1538 | init_to_row_start (it, w, row) |
| 1539 | struct it *it; |
| 1540 | struct window *w; |
| 1541 | struct glyph_row *row; |
| 1542 | { |
| 1543 | init_from_display_pos (it, w, &row->start); |
| 1544 | it->continuation_lines_width = row->continuation_lines_width; |
| 1545 | CHECK_IT (it); |
| 1546 | } |
| 1547 | |
| 1548 | |
| 1549 | /* Initialize IT for stepping through current_buffer in window W |
| 1550 | starting in the line following ROW, i.e. starting at ROW->end. */ |
| 1551 | |
| 1552 | static void |
| 1553 | init_to_row_end (it, w, row) |
| 1554 | struct it *it; |
| 1555 | struct window *w; |
| 1556 | struct glyph_row *row; |
| 1557 | { |
| 1558 | init_from_display_pos (it, w, &row->end); |
| 1559 | |
| 1560 | if (row->continued_p) |
| 1561 | it->continuation_lines_width = (row->continuation_lines_width |
| 1562 | + row->pixel_width); |
| 1563 | CHECK_IT (it); |
| 1564 | } |
| 1565 | |
| 1566 | |
| 1567 | |
| 1568 | \f |
| 1569 | /*********************************************************************** |
| 1570 | Text properties |
| 1571 | ***********************************************************************/ |
| 1572 | |
| 1573 | /* Called when IT reaches IT->stop_charpos. Handle text property and |
| 1574 | overlay changes. Set IT->stop_charpos to the next position where |
| 1575 | to stop. */ |
| 1576 | |
| 1577 | static void |
| 1578 | handle_stop (it) |
| 1579 | struct it *it; |
| 1580 | { |
| 1581 | enum prop_handled handled; |
| 1582 | int handle_overlay_change_p = 1; |
| 1583 | struct props *p; |
| 1584 | |
| 1585 | it->dpvec = NULL; |
| 1586 | it->current.dpvec_index = -1; |
| 1587 | |
| 1588 | do |
| 1589 | { |
| 1590 | handled = HANDLED_NORMALLY; |
| 1591 | |
| 1592 | /* Call text property handlers. */ |
| 1593 | for (p = it_props; p->handler; ++p) |
| 1594 | { |
| 1595 | handled = p->handler (it); |
| 1596 | |
| 1597 | if (handled == HANDLED_RECOMPUTE_PROPS) |
| 1598 | break; |
| 1599 | else if (handled == HANDLED_RETURN) |
| 1600 | return; |
| 1601 | else if (handled == HANDLED_OVERLAY_STRING_CONSUMED) |
| 1602 | handle_overlay_change_p = 0; |
| 1603 | } |
| 1604 | |
| 1605 | if (handled != HANDLED_RECOMPUTE_PROPS) |
| 1606 | { |
| 1607 | /* Don't check for overlay strings below when set to deliver |
| 1608 | characters from a display vector. */ |
| 1609 | if (it->method == next_element_from_display_vector) |
| 1610 | handle_overlay_change_p = 0; |
| 1611 | |
| 1612 | /* Handle overlay changes. */ |
| 1613 | if (handle_overlay_change_p) |
| 1614 | handled = handle_overlay_change (it); |
| 1615 | |
| 1616 | /* Determine where to stop next. */ |
| 1617 | if (handled == HANDLED_NORMALLY) |
| 1618 | compute_stop_pos (it); |
| 1619 | } |
| 1620 | } |
| 1621 | while (handled == HANDLED_RECOMPUTE_PROPS); |
| 1622 | } |
| 1623 | |
| 1624 | |
| 1625 | /* Compute IT->stop_charpos from text property and overlay change |
| 1626 | information for IT's current position. */ |
| 1627 | |
| 1628 | static void |
| 1629 | compute_stop_pos (it) |
| 1630 | struct it *it; |
| 1631 | { |
| 1632 | register INTERVAL iv, next_iv; |
| 1633 | Lisp_Object object, limit, position; |
| 1634 | |
| 1635 | /* If nowhere else, stop at the end. */ |
| 1636 | it->stop_charpos = it->end_charpos; |
| 1637 | |
| 1638 | if (STRINGP (it->string)) |
| 1639 | { |
| 1640 | /* Strings are usually short, so don't limit the search for |
| 1641 | properties. */ |
| 1642 | object = it->string; |
| 1643 | limit = Qnil; |
| 1644 | XSETFASTINT (position, IT_STRING_CHARPOS (*it)); |
| 1645 | } |
| 1646 | else |
| 1647 | { |
| 1648 | int charpos; |
| 1649 | |
| 1650 | /* If next overlay change is in front of the current stop pos |
| 1651 | (which is IT->end_charpos), stop there. Note: value of |
| 1652 | next_overlay_change is point-max if no overlay change |
| 1653 | follows. */ |
| 1654 | charpos = next_overlay_change (IT_CHARPOS (*it)); |
| 1655 | if (charpos < it->stop_charpos) |
| 1656 | it->stop_charpos = charpos; |
| 1657 | |
| 1658 | /* If showing the region, we have to stop at the region |
| 1659 | start or end because the face might change there. */ |
| 1660 | if (it->region_beg_charpos > 0) |
| 1661 | { |
| 1662 | if (IT_CHARPOS (*it) < it->region_beg_charpos) |
| 1663 | it->stop_charpos = min (it->stop_charpos, it->region_beg_charpos); |
| 1664 | else if (IT_CHARPOS (*it) < it->region_end_charpos) |
| 1665 | it->stop_charpos = min (it->stop_charpos, it->region_end_charpos); |
| 1666 | } |
| 1667 | |
| 1668 | /* Set up variables for computing the stop position from text |
| 1669 | property changes. */ |
| 1670 | XSETBUFFER (object, current_buffer); |
| 1671 | XSETFASTINT (limit, IT_CHARPOS (*it) + TEXT_PROP_DISTANCE_LIMIT); |
| 1672 | XSETFASTINT (position, IT_CHARPOS (*it)); |
| 1673 | |
| 1674 | } |
| 1675 | |
| 1676 | /* Get the interval containing IT's position. Value is a null |
| 1677 | interval if there isn't such an interval. */ |
| 1678 | iv = validate_interval_range (object, &position, &position, 0); |
| 1679 | if (!NULL_INTERVAL_P (iv)) |
| 1680 | { |
| 1681 | Lisp_Object values_here[LAST_PROP_IDX]; |
| 1682 | struct props *p; |
| 1683 | |
| 1684 | /* Get properties here. */ |
| 1685 | for (p = it_props; p->handler; ++p) |
| 1686 | values_here[p->idx] = textget (iv->plist, *p->name); |
| 1687 | |
| 1688 | /* Look for an interval following iv that has different |
| 1689 | properties. */ |
| 1690 | for (next_iv = next_interval (iv); |
| 1691 | (!NULL_INTERVAL_P (next_iv) |
| 1692 | && (NILP (limit) |
| 1693 | || XFASTINT (limit) > next_iv->position)); |
| 1694 | next_iv = next_interval (next_iv)) |
| 1695 | { |
| 1696 | for (p = it_props; p->handler; ++p) |
| 1697 | { |
| 1698 | Lisp_Object new_value; |
| 1699 | |
| 1700 | new_value = textget (next_iv->plist, *p->name); |
| 1701 | if (!EQ (values_here[p->idx], new_value)) |
| 1702 | break; |
| 1703 | } |
| 1704 | |
| 1705 | if (p->handler) |
| 1706 | break; |
| 1707 | } |
| 1708 | |
| 1709 | if (!NULL_INTERVAL_P (next_iv)) |
| 1710 | { |
| 1711 | if (INTEGERP (limit) |
| 1712 | && next_iv->position >= XFASTINT (limit)) |
| 1713 | /* No text property change up to limit. */ |
| 1714 | it->stop_charpos = min (XFASTINT (limit), it->stop_charpos); |
| 1715 | else |
| 1716 | /* Text properties change in next_iv. */ |
| 1717 | it->stop_charpos = min (it->stop_charpos, next_iv->position); |
| 1718 | } |
| 1719 | } |
| 1720 | |
| 1721 | xassert (STRINGP (it->string) |
| 1722 | || (it->stop_charpos >= BEGV |
| 1723 | && it->stop_charpos >= IT_CHARPOS (*it))); |
| 1724 | } |
| 1725 | |
| 1726 | |
| 1727 | /* Return the position of the next overlay change after POS in |
| 1728 | current_buffer. Value is point-max if no overlay change |
| 1729 | follows. This is like `next-overlay-change' but doesn't use |
| 1730 | xmalloc. */ |
| 1731 | |
| 1732 | static int |
| 1733 | next_overlay_change (pos) |
| 1734 | int pos; |
| 1735 | { |
| 1736 | int noverlays; |
| 1737 | int endpos; |
| 1738 | Lisp_Object *overlays; |
| 1739 | int len; |
| 1740 | int i; |
| 1741 | |
| 1742 | /* Get all overlays at the given position. */ |
| 1743 | len = 10; |
| 1744 | overlays = (Lisp_Object *) alloca (len * sizeof *overlays); |
| 1745 | noverlays = overlays_at (pos, 0, &overlays, &len, &endpos, NULL); |
| 1746 | if (noverlays > len) |
| 1747 | { |
| 1748 | len = noverlays; |
| 1749 | overlays = (Lisp_Object *) alloca (len * sizeof *overlays); |
| 1750 | noverlays = overlays_at (pos, 0, &overlays, &len, &endpos, NULL); |
| 1751 | } |
| 1752 | |
| 1753 | /* If any of these overlays ends before endpos, |
| 1754 | use its ending point instead. */ |
| 1755 | for (i = 0; i < noverlays; ++i) |
| 1756 | { |
| 1757 | Lisp_Object oend; |
| 1758 | int oendpos; |
| 1759 | |
| 1760 | oend = OVERLAY_END (overlays[i]); |
| 1761 | oendpos = OVERLAY_POSITION (oend); |
| 1762 | endpos = min (endpos, oendpos); |
| 1763 | } |
| 1764 | |
| 1765 | return endpos; |
| 1766 | } |
| 1767 | |
| 1768 | |
| 1769 | \f |
| 1770 | /*********************************************************************** |
| 1771 | Fontification |
| 1772 | ***********************************************************************/ |
| 1773 | |
| 1774 | /* Handle changes in the `fontified' property of the current buffer by |
| 1775 | calling hook functions from Qfontification_functions to fontify |
| 1776 | regions of text. */ |
| 1777 | |
| 1778 | static enum prop_handled |
| 1779 | handle_fontified_prop (it) |
| 1780 | struct it *it; |
| 1781 | { |
| 1782 | Lisp_Object prop, pos; |
| 1783 | enum prop_handled handled = HANDLED_NORMALLY; |
| 1784 | struct gcpro gcpro1; |
| 1785 | |
| 1786 | /* Get the value of the `fontified' property at IT's current buffer |
| 1787 | position. (The `fontified' property doesn't have a special |
| 1788 | meaning in strings.) If the value is nil, call functions from |
| 1789 | Qfontification_functions. */ |
| 1790 | if (!STRINGP (it->string) |
| 1791 | && it->s == NULL |
| 1792 | && !NILP (Vfontification_functions) |
| 1793 | && (pos = make_number (IT_CHARPOS (*it)), |
| 1794 | prop = Fget_char_property (pos, Qfontified, Qnil), |
| 1795 | NILP (prop))) |
| 1796 | { |
| 1797 | Lisp_Object args[2]; |
| 1798 | |
| 1799 | GCPRO1 (pos); |
| 1800 | /* Run the hook functions. */ |
| 1801 | args[0] = Qfontification_functions; |
| 1802 | args[1] = pos; |
| 1803 | Frun_hook_with_args (make_number (2), args); |
| 1804 | |
| 1805 | /* Return HANDLED_RECOMPUTE_PROPS only if function fontified |
| 1806 | something. This avoids an endless loop if they failed to |
| 1807 | fontify the text for which reason ever. */ |
| 1808 | if (!NILP (Fget_char_property (pos, Qfontified, Qnil))) |
| 1809 | handled = HANDLED_RECOMPUTE_PROPS; |
| 1810 | UNGCPRO; |
| 1811 | } |
| 1812 | |
| 1813 | return handled; |
| 1814 | } |
| 1815 | |
| 1816 | |
| 1817 | \f |
| 1818 | /*********************************************************************** |
| 1819 | Faces |
| 1820 | ***********************************************************************/ |
| 1821 | |
| 1822 | /* Set up iterator IT from face properties at its current position. |
| 1823 | Called from handle_stop. */ |
| 1824 | |
| 1825 | static enum prop_handled |
| 1826 | handle_face_prop (it) |
| 1827 | struct it *it; |
| 1828 | { |
| 1829 | int new_face_id, next_stop; |
| 1830 | |
| 1831 | if (!STRINGP (it->string)) |
| 1832 | { |
| 1833 | new_face_id |
| 1834 | = face_at_buffer_position (it->w, |
| 1835 | IT_CHARPOS (*it), |
| 1836 | it->region_beg_charpos, |
| 1837 | it->region_end_charpos, |
| 1838 | &next_stop, |
| 1839 | (IT_CHARPOS (*it) |
| 1840 | + TEXT_PROP_DISTANCE_LIMIT), |
| 1841 | 0); |
| 1842 | |
| 1843 | /* Is this a start of a run of characters with box face? |
| 1844 | Caveat: this can be called for a freshly initialized |
| 1845 | iterator; face_id is -1 is this case. We know that the new |
| 1846 | face will not change until limit, i.e. if the new face has a |
| 1847 | box, all characters up to limit will have one. But, as |
| 1848 | usual, we don't know whether limit is really the end. */ |
| 1849 | if (new_face_id != it->face_id) |
| 1850 | { |
| 1851 | struct face *new_face = FACE_FROM_ID (it->f, new_face_id); |
| 1852 | |
| 1853 | /* If new face has a box but old face has not, this is |
| 1854 | the start of a run of characters with box, i.e. it has |
| 1855 | a shadow on the left side. The value of face_id of the |
| 1856 | iterator will be -1 if this is the initial call that gets |
| 1857 | the face. In this case, we have to look in front of IT's |
| 1858 | position and see whether there is a face != new_face_id. */ |
| 1859 | it->start_of_box_run_p |
| 1860 | = (new_face->box != FACE_NO_BOX |
| 1861 | && (it->face_id >= 0 |
| 1862 | || IT_CHARPOS (*it) == BEG |
| 1863 | || new_face_id != face_before_it_pos (it))); |
| 1864 | it->face_box_p = new_face->box != FACE_NO_BOX; |
| 1865 | } |
| 1866 | } |
| 1867 | else |
| 1868 | { |
| 1869 | new_face_id |
| 1870 | = face_at_string_position (it->w, |
| 1871 | it->string, |
| 1872 | IT_STRING_CHARPOS (*it), |
| 1873 | (it->current.overlay_string_index >= 0 |
| 1874 | ? IT_CHARPOS (*it) |
| 1875 | : 0), |
| 1876 | it->region_beg_charpos, |
| 1877 | it->region_end_charpos, |
| 1878 | &next_stop, |
| 1879 | it->base_face_id); |
| 1880 | |
| 1881 | #if 0 /* This shouldn't be neccessary. Let's check it. */ |
| 1882 | /* If IT is used to display a mode line we would really like to |
| 1883 | use the mode line face instead of the frame's default face. */ |
| 1884 | if (it->glyph_row == MATRIX_MODE_LINE_ROW (it->w->desired_matrix) |
| 1885 | && new_face_id == DEFAULT_FACE_ID) |
| 1886 | new_face_id = MODE_LINE_FACE_ID; |
| 1887 | #endif |
| 1888 | |
| 1889 | /* Is this a start of a run of characters with box? Caveat: |
| 1890 | this can be called for a freshly allocated iterator; face_id |
| 1891 | is -1 is this case. We know that the new face will not |
| 1892 | change until the next check pos, i.e. if the new face has a |
| 1893 | box, all characters up to that position will have a |
| 1894 | box. But, as usual, we don't know whether that position |
| 1895 | is really the end. */ |
| 1896 | if (new_face_id != it->face_id) |
| 1897 | { |
| 1898 | struct face *new_face = FACE_FROM_ID (it->f, new_face_id); |
| 1899 | struct face *old_face = FACE_FROM_ID (it->f, it->face_id); |
| 1900 | |
| 1901 | /* If new face has a box but old face hasn't, this is the |
| 1902 | start of a run of characters with box, i.e. it has a |
| 1903 | shadow on the left side. */ |
| 1904 | it->start_of_box_run_p |
| 1905 | = new_face->box && (old_face == NULL || !old_face->box); |
| 1906 | it->face_box_p = new_face->box != FACE_NO_BOX; |
| 1907 | } |
| 1908 | } |
| 1909 | |
| 1910 | it->face_id = new_face_id; |
| 1911 | it->charset = CHARSET_ASCII; |
| 1912 | return HANDLED_NORMALLY; |
| 1913 | } |
| 1914 | |
| 1915 | |
| 1916 | /* Compute the face one character before or after the current position |
| 1917 | of IT. BEFORE_P non-zero means get the face in front of IT's |
| 1918 | position. Value is the id of the face. */ |
| 1919 | |
| 1920 | static int |
| 1921 | face_before_or_after_it_pos (it, before_p) |
| 1922 | struct it *it; |
| 1923 | int before_p; |
| 1924 | { |
| 1925 | int face_id, limit; |
| 1926 | int next_check_charpos; |
| 1927 | struct text_pos pos; |
| 1928 | |
| 1929 | xassert (it->s == NULL); |
| 1930 | |
| 1931 | if (STRINGP (it->string)) |
| 1932 | { |
| 1933 | /* No face change past the end of the string (for the case |
| 1934 | we are padding with spaces). No face change before the |
| 1935 | string start. */ |
| 1936 | if (IT_STRING_CHARPOS (*it) >= XSTRING (it->string)->size |
| 1937 | || (IT_STRING_CHARPOS (*it) == 0 && before_p)) |
| 1938 | return it->face_id; |
| 1939 | |
| 1940 | /* Set pos to the position before or after IT's current position. */ |
| 1941 | if (before_p) |
| 1942 | pos = string_pos (IT_STRING_CHARPOS (*it) - 1, it->string); |
| 1943 | else |
| 1944 | pos = string_pos (IT_STRING_CHARPOS (*it) + 1, it->string); |
| 1945 | |
| 1946 | /* Get the face for ASCII, or unibyte. */ |
| 1947 | face_id |
| 1948 | = face_at_string_position (it->w, |
| 1949 | it->string, |
| 1950 | CHARPOS (pos), |
| 1951 | (it->current.overlay_string_index >= 0 |
| 1952 | ? IT_CHARPOS (*it) |
| 1953 | : 0), |
| 1954 | it->region_beg_charpos, |
| 1955 | it->region_end_charpos, |
| 1956 | &next_check_charpos, |
| 1957 | it->base_face_id); |
| 1958 | |
| 1959 | /* Correct the face for charsets different from ASCII. Do it |
| 1960 | for the multibyte case only. The face returned above is |
| 1961 | suitable for unibyte text if IT->string is unibyte. */ |
| 1962 | if (STRING_MULTIBYTE (it->string)) |
| 1963 | { |
| 1964 | unsigned char *p = XSTRING (it->string)->data + BYTEPOS (pos); |
| 1965 | int rest = STRING_BYTES (XSTRING (it->string)) - BYTEPOS (pos); |
| 1966 | int c, len, charset; |
| 1967 | |
| 1968 | c = string_char_and_length (p, rest, &len); |
| 1969 | charset = CHAR_CHARSET (c); |
| 1970 | if (charset != CHARSET_ASCII) |
| 1971 | face_id = FACE_FOR_CHARSET (it->f, face_id, charset); |
| 1972 | } |
| 1973 | } |
| 1974 | else |
| 1975 | { |
| 1976 | if ((IT_CHARPOS (*it) >= ZV && !before_p) |
| 1977 | || (IT_CHARPOS (*it) <= BEGV && before_p)) |
| 1978 | return it->face_id; |
| 1979 | |
| 1980 | limit = IT_CHARPOS (*it) + TEXT_PROP_DISTANCE_LIMIT; |
| 1981 | pos = it->current.pos; |
| 1982 | |
| 1983 | if (before_p) |
| 1984 | DEC_TEXT_POS (pos); |
| 1985 | else |
| 1986 | INC_TEXT_POS (pos); |
| 1987 | |
| 1988 | /* Determine face for CHARSET_ASCII, or unibyte. */ |
| 1989 | face_id = face_at_buffer_position (it->w, |
| 1990 | CHARPOS (pos), |
| 1991 | it->region_beg_charpos, |
| 1992 | it->region_end_charpos, |
| 1993 | &next_check_charpos, |
| 1994 | limit, 0); |
| 1995 | |
| 1996 | /* Correct the face for charsets different from ASCII. Do it |
| 1997 | for the multibyte case only. The face returned above is |
| 1998 | suitable for unibyte text if current_buffer is unibyte. */ |
| 1999 | if (it->multibyte_p) |
| 2000 | { |
| 2001 | int charset = charset_at_position (pos); |
| 2002 | if (charset != CHARSET_ASCII) |
| 2003 | face_id = FACE_FOR_CHARSET (it->f, face_id, charset); |
| 2004 | } |
| 2005 | } |
| 2006 | |
| 2007 | return face_id; |
| 2008 | } |
| 2009 | |
| 2010 | |
| 2011 | \f |
| 2012 | /*********************************************************************** |
| 2013 | Invisible text |
| 2014 | ***********************************************************************/ |
| 2015 | |
| 2016 | /* Set up iterator IT from invisible properties at its current |
| 2017 | position. Called from handle_stop. */ |
| 2018 | |
| 2019 | static enum prop_handled |
| 2020 | handle_invisible_prop (it) |
| 2021 | struct it *it; |
| 2022 | { |
| 2023 | enum prop_handled handled = HANDLED_NORMALLY; |
| 2024 | |
| 2025 | if (STRINGP (it->string)) |
| 2026 | { |
| 2027 | extern Lisp_Object Qinvisible; |
| 2028 | Lisp_Object prop, end_charpos, limit, charpos; |
| 2029 | |
| 2030 | /* Get the value of the invisible text property at the |
| 2031 | current position. Value will be nil if there is no such |
| 2032 | property. */ |
| 2033 | XSETFASTINT (charpos, IT_STRING_CHARPOS (*it)); |
| 2034 | prop = Fget_text_property (charpos, Qinvisible, it->string); |
| 2035 | |
| 2036 | if (!NILP (prop)) |
| 2037 | { |
| 2038 | handled = HANDLED_RECOMPUTE_PROPS; |
| 2039 | |
| 2040 | /* Get the position at which the next change of the |
| 2041 | invisible text property can be found in IT->string. |
| 2042 | Value will be nil if the property value is the same for |
| 2043 | all the rest of IT->string. */ |
| 2044 | XSETINT (limit, XSTRING (it->string)->size); |
| 2045 | end_charpos = Fnext_single_property_change (charpos, Qinvisible, |
| 2046 | it->string, limit); |
| 2047 | |
| 2048 | /* Text at current position is invisible. The next |
| 2049 | change in the property is at position end_charpos. |
| 2050 | Move IT's current position to that position. */ |
| 2051 | if (INTEGERP (end_charpos) |
| 2052 | && XFASTINT (end_charpos) < XFASTINT (limit)) |
| 2053 | { |
| 2054 | struct text_pos old; |
| 2055 | old = it->current.string_pos; |
| 2056 | IT_STRING_CHARPOS (*it) = XFASTINT (end_charpos); |
| 2057 | compute_string_pos (&it->current.string_pos, old, it->string); |
| 2058 | } |
| 2059 | else |
| 2060 | { |
| 2061 | /* The rest of the string is invisible. If this is an |
| 2062 | overlay string, proceed with the next overlay string |
| 2063 | or whatever comes and return a character from there. */ |
| 2064 | if (it->current.overlay_string_index >= 0) |
| 2065 | { |
| 2066 | next_overlay_string (it); |
| 2067 | /* Don't check for overlay strings when we just |
| 2068 | finished processing them. */ |
| 2069 | handled = HANDLED_OVERLAY_STRING_CONSUMED; |
| 2070 | } |
| 2071 | else |
| 2072 | { |
| 2073 | struct Lisp_String *s = XSTRING (it->string); |
| 2074 | IT_STRING_CHARPOS (*it) = s->size; |
| 2075 | IT_STRING_BYTEPOS (*it) = STRING_BYTES (s); |
| 2076 | } |
| 2077 | } |
| 2078 | } |
| 2079 | } |
| 2080 | else |
| 2081 | { |
| 2082 | int visible_p, newpos, next_stop; |
| 2083 | Lisp_Object pos, prop; |
| 2084 | |
| 2085 | /* First of all, is there invisible text at this position? */ |
| 2086 | XSETFASTINT (pos, IT_CHARPOS (*it)); |
| 2087 | prop = Fget_char_property (pos, Qinvisible, it->window); |
| 2088 | |
| 2089 | /* If we are on invisible text, skip over it. */ |
| 2090 | if (TEXT_PROP_MEANS_INVISIBLE (prop)) |
| 2091 | { |
| 2092 | /* Record whether we have to display an ellipsis for the |
| 2093 | invisible text. */ |
| 2094 | int display_ellipsis_p |
| 2095 | = TEXT_PROP_MEANS_INVISIBLE_WITH_ELLIPSIS (prop); |
| 2096 | |
| 2097 | handled = HANDLED_RECOMPUTE_PROPS; |
| 2098 | |
| 2099 | /* Loop skipping over invisible text. The loop is left at |
| 2100 | ZV or with IT on the first char being visible again. */ |
| 2101 | do |
| 2102 | { |
| 2103 | /* Try to skip some invisible text. Return value is the |
| 2104 | position reached which can be equal to IT's position |
| 2105 | if there is nothing invisible here. This skips both |
| 2106 | over invisible text properties and overlays with |
| 2107 | invisible property. */ |
| 2108 | newpos = skip_invisible (IT_CHARPOS (*it), |
| 2109 | &next_stop, ZV, it->window); |
| 2110 | |
| 2111 | /* If we skipped nothing at all we weren't at invisible |
| 2112 | text in the first place. If everything to the end of |
| 2113 | the buffer was skipped, end the loop. */ |
| 2114 | if (newpos == IT_CHARPOS (*it) || newpos >= ZV) |
| 2115 | visible_p = 1; |
| 2116 | else |
| 2117 | { |
| 2118 | /* We skipped some characters but not necessarily |
| 2119 | all there are. Check if we ended up on visible |
| 2120 | text. Fget_char_property returns the property of |
| 2121 | the char before the given position, i.e. if we |
| 2122 | get visible_p = 1, this means that the char at |
| 2123 | newpos is visible. */ |
| 2124 | XSETFASTINT (pos, newpos); |
| 2125 | prop = Fget_char_property (pos, Qinvisible, it->window); |
| 2126 | visible_p = !TEXT_PROP_MEANS_INVISIBLE (prop); |
| 2127 | } |
| 2128 | |
| 2129 | /* If we ended up on invisible text, proceed to |
| 2130 | skip starting with next_stop. */ |
| 2131 | if (!visible_p) |
| 2132 | IT_CHARPOS (*it) = next_stop; |
| 2133 | } |
| 2134 | while (!visible_p); |
| 2135 | |
| 2136 | /* The position newpos is now either ZV or on visible text. */ |
| 2137 | IT_CHARPOS (*it) = newpos; |
| 2138 | IT_BYTEPOS (*it) = CHAR_TO_BYTE (newpos); |
| 2139 | |
| 2140 | /* Maybe return `...' next for the end of the invisible text. */ |
| 2141 | if (display_ellipsis_p) |
| 2142 | { |
| 2143 | if (it->dp |
| 2144 | && VECTORP (DISP_INVIS_VECTOR (it->dp))) |
| 2145 | { |
| 2146 | struct Lisp_Vector *v = XVECTOR (DISP_INVIS_VECTOR (it->dp)); |
| 2147 | it->dpvec = v->contents; |
| 2148 | it->dpend = v->contents + v->size; |
| 2149 | } |
| 2150 | else |
| 2151 | { |
| 2152 | /* Default `...'. */ |
| 2153 | it->dpvec = default_invis_vector; |
| 2154 | it->dpend = default_invis_vector + 3; |
| 2155 | } |
| 2156 | |
| 2157 | /* The ellipsis display does not replace the display of |
| 2158 | the character at the new position. Indicate this by |
| 2159 | setting IT->dpvec_char_len to zero. */ |
| 2160 | it->dpvec_char_len = 0; |
| 2161 | |
| 2162 | it->current.dpvec_index = 0; |
| 2163 | it->method = next_element_from_display_vector; |
| 2164 | } |
| 2165 | } |
| 2166 | } |
| 2167 | |
| 2168 | return handled; |
| 2169 | } |
| 2170 | |
| 2171 | |
| 2172 | \f |
| 2173 | /*********************************************************************** |
| 2174 | 'display' property |
| 2175 | ***********************************************************************/ |
| 2176 | |
| 2177 | /* Set up iterator IT from `display' property at its current position. |
| 2178 | Called from handle_stop. */ |
| 2179 | |
| 2180 | static enum prop_handled |
| 2181 | handle_display_prop (it) |
| 2182 | struct it *it; |
| 2183 | { |
| 2184 | Lisp_Object prop, object; |
| 2185 | struct text_pos *position; |
| 2186 | int space_or_image_found_p; |
| 2187 | |
| 2188 | if (STRINGP (it->string)) |
| 2189 | { |
| 2190 | object = it->string; |
| 2191 | position = &it->current.string_pos; |
| 2192 | } |
| 2193 | else |
| 2194 | { |
| 2195 | object = Qnil; |
| 2196 | position = &it->current.pos; |
| 2197 | } |
| 2198 | |
| 2199 | /* Reset those iterator values set from display property values. */ |
| 2200 | it->font_height = Qnil; |
| 2201 | it->space_width = Qnil; |
| 2202 | it->voffset = 0; |
| 2203 | |
| 2204 | /* We don't support recursive `display' properties, i.e. string |
| 2205 | values that have a string `display' property, that have a string |
| 2206 | `display' property etc. */ |
| 2207 | if (!it->string_from_display_prop_p) |
| 2208 | it->area = TEXT_AREA; |
| 2209 | |
| 2210 | prop = Fget_char_property (make_number (position->charpos), |
| 2211 | Qdisplay, object); |
| 2212 | if (NILP (prop)) |
| 2213 | return HANDLED_NORMALLY; |
| 2214 | |
| 2215 | space_or_image_found_p = 0; |
| 2216 | if (CONSP (prop) |
| 2217 | && CONSP (XCAR (prop)) |
| 2218 | && !EQ (Qmargin, XCAR (XCAR (prop)))) |
| 2219 | { |
| 2220 | /* A list of sub-properties. */ |
| 2221 | while (CONSP (prop)) |
| 2222 | { |
| 2223 | if (handle_single_display_prop (it, XCAR (prop), object, position)) |
| 2224 | space_or_image_found_p = 1; |
| 2225 | prop = XCDR (prop); |
| 2226 | } |
| 2227 | } |
| 2228 | else if (VECTORP (prop)) |
| 2229 | { |
| 2230 | int i; |
| 2231 | for (i = 0; i < XVECTOR (prop)->size; ++i) |
| 2232 | if (handle_single_display_prop (it, XVECTOR (prop)->contents[i], |
| 2233 | object, position)) |
| 2234 | space_or_image_found_p = 1; |
| 2235 | } |
| 2236 | else |
| 2237 | { |
| 2238 | if (handle_single_display_prop (it, prop, object, position)) |
| 2239 | space_or_image_found_p = 1; |
| 2240 | } |
| 2241 | |
| 2242 | return space_or_image_found_p ? HANDLED_RETURN : HANDLED_NORMALLY; |
| 2243 | } |
| 2244 | |
| 2245 | |
| 2246 | /* Value is the position of the end of the `display' property starting |
| 2247 | at START_POS in OBJECT. */ |
| 2248 | |
| 2249 | static struct text_pos |
| 2250 | display_prop_end (it, object, start_pos) |
| 2251 | struct it *it; |
| 2252 | Lisp_Object object; |
| 2253 | struct text_pos start_pos; |
| 2254 | { |
| 2255 | Lisp_Object end; |
| 2256 | struct text_pos end_pos; |
| 2257 | |
| 2258 | end = next_single_char_property_change (make_number (CHARPOS (start_pos)), |
| 2259 | Qdisplay, object, Qnil); |
| 2260 | CHARPOS (end_pos) = XFASTINT (end); |
| 2261 | if (STRINGP (object)) |
| 2262 | compute_string_pos (&end_pos, start_pos, it->string); |
| 2263 | else |
| 2264 | BYTEPOS (end_pos) = CHAR_TO_BYTE (XFASTINT (end)); |
| 2265 | |
| 2266 | return end_pos; |
| 2267 | } |
| 2268 | |
| 2269 | |
| 2270 | /* Set up IT from a single `display' sub-property value PROP. OBJECT |
| 2271 | is the object in which the `display' property was found. *POSITION |
| 2272 | is the position at which it was found. |
| 2273 | |
| 2274 | If PROP is a `space' or `image' sub-property, set *POSITION to the |
| 2275 | end position of the `display' property. |
| 2276 | |
| 2277 | Value is non-zero if a `space' or `image' property value was found. */ |
| 2278 | |
| 2279 | static int |
| 2280 | handle_single_display_prop (it, prop, object, position) |
| 2281 | struct it *it; |
| 2282 | Lisp_Object prop; |
| 2283 | Lisp_Object object; |
| 2284 | struct text_pos *position; |
| 2285 | { |
| 2286 | Lisp_Object value; |
| 2287 | int space_or_image_found_p = 0; |
| 2288 | |
| 2289 | Lisp_Object form; |
| 2290 | |
| 2291 | /* If PROP is a list of the form `(when FORM . VALUE)', FORM is |
| 2292 | evaluated. If the result is nil, VALUE is ignored. */ |
| 2293 | form = Qt; |
| 2294 | if (CONSP (prop) && EQ (XCAR (prop), Qwhen)) |
| 2295 | { |
| 2296 | prop = XCDR (prop); |
| 2297 | if (!CONSP (prop)) |
| 2298 | return 0; |
| 2299 | form = XCAR (prop); |
| 2300 | prop = XCDR (prop); |
| 2301 | } |
| 2302 | |
| 2303 | if (!NILP (form) && !EQ (form, Qt)) |
| 2304 | { |
| 2305 | struct gcpro gcpro1; |
| 2306 | struct text_pos end_pos, pt; |
| 2307 | |
| 2308 | end_pos = display_prop_end (it, object, *position); |
| 2309 | GCPRO1 (form); |
| 2310 | |
| 2311 | /* Temporarily set point to the end position, and then evaluate |
| 2312 | the form. This makes `(eolp)' work as FORM. */ |
| 2313 | CHARPOS (pt) = PT; |
| 2314 | BYTEPOS (pt) = PT_BYTE; |
| 2315 | TEMP_SET_PT_BOTH (CHARPOS (end_pos), BYTEPOS (end_pos)); |
| 2316 | form = eval_form (form); |
| 2317 | TEMP_SET_PT_BOTH (CHARPOS (pt), BYTEPOS (pt)); |
| 2318 | UNGCPRO; |
| 2319 | } |
| 2320 | |
| 2321 | if (NILP (form)) |
| 2322 | return 0; |
| 2323 | |
| 2324 | if (CONSP (prop) |
| 2325 | && EQ (XCAR (prop), Qheight) |
| 2326 | && CONSP (XCDR (prop))) |
| 2327 | { |
| 2328 | if (FRAME_TERMCAP_P (it->f) || FRAME_MSDOS_P (it->f)) |
| 2329 | return 0; |
| 2330 | |
| 2331 | /* `(height HEIGHT)'. */ |
| 2332 | it->font_height = XCAR (XCDR (prop)); |
| 2333 | if (!NILP (it->font_height)) |
| 2334 | { |
| 2335 | struct face *face = FACE_FROM_ID (it->f, it->face_id); |
| 2336 | int new_height = -1; |
| 2337 | |
| 2338 | if (CONSP (it->font_height) |
| 2339 | && (EQ (XCAR (it->font_height), Qplus) |
| 2340 | || EQ (XCAR (it->font_height), Qminus)) |
| 2341 | && CONSP (XCDR (it->font_height)) |
| 2342 | && INTEGERP (XCAR (XCDR (it->font_height)))) |
| 2343 | { |
| 2344 | /* `(+ N)' or `(- N)' where N is an integer. */ |
| 2345 | int steps = XINT (XCAR (XCDR (it->font_height))); |
| 2346 | if (EQ (XCAR (it->font_height), Qplus)) |
| 2347 | steps = - steps; |
| 2348 | it->face_id = smaller_face (it->f, it->face_id, steps); |
| 2349 | } |
| 2350 | else if (SYMBOLP (it->font_height)) |
| 2351 | { |
| 2352 | /* Call function with current height as argument. |
| 2353 | Value is the new height. */ |
| 2354 | Lisp_Object form, height; |
| 2355 | struct gcpro gcpro1; |
| 2356 | |
| 2357 | height = face->lface[LFACE_HEIGHT_INDEX]; |
| 2358 | form = Fcons (it->font_height, Fcons (height, Qnil)); |
| 2359 | GCPRO1 (form); |
| 2360 | height = eval_form (form); |
| 2361 | if (NUMBERP (height)) |
| 2362 | new_height = XFLOATINT (height); |
| 2363 | UNGCPRO; |
| 2364 | } |
| 2365 | else if (NUMBERP (it->font_height)) |
| 2366 | { |
| 2367 | /* Value is a multiple of the canonical char height. */ |
| 2368 | struct face *face; |
| 2369 | |
| 2370 | face = FACE_FROM_ID (it->f, DEFAULT_FACE_ID); |
| 2371 | new_height = (XFLOATINT (it->font_height) |
| 2372 | * XINT (face->lface[LFACE_HEIGHT_INDEX])); |
| 2373 | } |
| 2374 | else |
| 2375 | { |
| 2376 | /* Evaluate IT->font_height with `height' bound to the |
| 2377 | current specified height to get the new height. */ |
| 2378 | Lisp_Object value; |
| 2379 | int count = specpdl_ptr - specpdl; |
| 2380 | |
| 2381 | specbind (Qheight, face->lface[LFACE_HEIGHT_INDEX]); |
| 2382 | value = eval_form (it->font_height); |
| 2383 | unbind_to (count, Qnil); |
| 2384 | |
| 2385 | if (NUMBERP (value)) |
| 2386 | new_height = XFLOATINT (value); |
| 2387 | } |
| 2388 | |
| 2389 | if (new_height > 0) |
| 2390 | it->face_id = face_with_height (it->f, it->face_id, new_height); |
| 2391 | } |
| 2392 | } |
| 2393 | else if (CONSP (prop) |
| 2394 | && EQ (XCAR (prop), Qspace_width) |
| 2395 | && CONSP (XCDR (prop))) |
| 2396 | { |
| 2397 | /* `(space_width WIDTH)'. */ |
| 2398 | if (FRAME_TERMCAP_P (it->f) || FRAME_MSDOS_P (it->f)) |
| 2399 | return 0; |
| 2400 | |
| 2401 | value = XCAR (XCDR (prop)); |
| 2402 | if (NUMBERP (value) && XFLOATINT (value) > 0) |
| 2403 | it->space_width = value; |
| 2404 | } |
| 2405 | else if (CONSP (prop) |
| 2406 | && EQ (XCAR (prop), Qraise) |
| 2407 | && CONSP (XCDR (prop))) |
| 2408 | { |
| 2409 | #ifdef HAVE_WINDOW_SYSTEM |
| 2410 | /* `(raise FACTOR)'. */ |
| 2411 | if (FRAME_TERMCAP_P (it->f) || FRAME_MSDOS_P (it->f)) |
| 2412 | return 0; |
| 2413 | |
| 2414 | value = XCAR (XCDR (prop)); |
| 2415 | if (NUMBERP (value)) |
| 2416 | { |
| 2417 | struct face *face = FACE_FROM_ID (it->f, it->face_id); |
| 2418 | it->voffset = - (XFLOATINT (value) |
| 2419 | * (face->font->ascent + face->font->descent)); |
| 2420 | } |
| 2421 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 2422 | } |
| 2423 | else if (!it->string_from_display_prop_p) |
| 2424 | { |
| 2425 | /* `((margin left-margin) VALUE)' or `((margin right-margin) |
| 2426 | VALUE) or `((margin nil) VALUE)' or VALUE. */ |
| 2427 | Lisp_Object location, value; |
| 2428 | struct text_pos start_pos; |
| 2429 | int valid_p; |
| 2430 | |
| 2431 | /* Characters having this form of property are not displayed, so |
| 2432 | we have to find the end of the property. */ |
| 2433 | space_or_image_found_p = 1; |
| 2434 | start_pos = *position; |
| 2435 | *position = display_prop_end (it, object, start_pos); |
| 2436 | |
| 2437 | /* Let's stop at the new position and assume that all |
| 2438 | text properties change there. */ |
| 2439 | it->stop_charpos = position->charpos; |
| 2440 | |
| 2441 | location = Qunbound; |
| 2442 | if (CONSP (prop) && CONSP (XCAR (prop))) |
| 2443 | { |
| 2444 | Lisp_Object tem; |
| 2445 | |
| 2446 | value = XCDR (prop); |
| 2447 | if (CONSP (value)) |
| 2448 | value = XCAR (value); |
| 2449 | |
| 2450 | tem = XCAR (prop); |
| 2451 | if (EQ (XCAR (tem), Qmargin) |
| 2452 | && (tem = XCDR (tem), |
| 2453 | tem = CONSP (tem) ? XCAR (tem) : Qnil, |
| 2454 | (NILP (tem) |
| 2455 | || EQ (tem, Qleft_margin) |
| 2456 | || EQ (tem, Qright_margin)))) |
| 2457 | location = tem; |
| 2458 | } |
| 2459 | |
| 2460 | if (EQ (location, Qunbound)) |
| 2461 | { |
| 2462 | location = Qnil; |
| 2463 | value = prop; |
| 2464 | } |
| 2465 | |
| 2466 | #ifdef HAVE_WINDOW_SYSTEM |
| 2467 | if (FRAME_TERMCAP_P (it->f) || FRAME_MSDOS_P (it->f)) |
| 2468 | valid_p = STRINGP (value); |
| 2469 | else |
| 2470 | valid_p = (STRINGP (value) |
| 2471 | || (CONSP (value) && EQ (XCAR (value), Qspace)) |
| 2472 | || valid_image_p (value)); |
| 2473 | #else /* not HAVE_WINDOW_SYSTEM */ |
| 2474 | valid_p = STRINGP (value); |
| 2475 | #endif /* not HAVE_WINDOW_SYSTEM */ |
| 2476 | |
| 2477 | if ((EQ (location, Qleft_margin) |
| 2478 | || EQ (location, Qright_margin) |
| 2479 | || NILP (location)) |
| 2480 | && valid_p) |
| 2481 | { |
| 2482 | /* Save current settings of IT so that we can restore them |
| 2483 | when we are finished with the glyph property value. */ |
| 2484 | push_it (it); |
| 2485 | |
| 2486 | if (NILP (location)) |
| 2487 | it->area = TEXT_AREA; |
| 2488 | else if (EQ (location, Qleft_margin)) |
| 2489 | it->area = LEFT_MARGIN_AREA; |
| 2490 | else |
| 2491 | it->area = RIGHT_MARGIN_AREA; |
| 2492 | |
| 2493 | if (STRINGP (value)) |
| 2494 | { |
| 2495 | it->string = value; |
| 2496 | it->multibyte_p = STRING_MULTIBYTE (it->string); |
| 2497 | it->current.overlay_string_index = -1; |
| 2498 | IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = 0; |
| 2499 | it->end_charpos = it->string_nchars |
| 2500 | = XSTRING (it->string)->size; |
| 2501 | it->method = next_element_from_string; |
| 2502 | it->stop_charpos = 0; |
| 2503 | it->string_from_display_prop_p = 1; |
| 2504 | } |
| 2505 | else if (CONSP (value) && EQ (XCAR (value), Qspace)) |
| 2506 | { |
| 2507 | it->method = next_element_from_stretch; |
| 2508 | it->object = value; |
| 2509 | it->current.pos = it->position = start_pos; |
| 2510 | } |
| 2511 | #ifdef HAVE_WINDOW_SYSTEM |
| 2512 | else |
| 2513 | { |
| 2514 | it->what = IT_IMAGE; |
| 2515 | it->image_id = lookup_image (it->f, value); |
| 2516 | it->position = start_pos; |
| 2517 | it->object = NILP (object) ? it->w->buffer : object; |
| 2518 | it->method = next_element_from_image; |
| 2519 | |
| 2520 | /* Say that we don't have consumed the characters with |
| 2521 | `display' property yet. The call to pop_it in |
| 2522 | set_iterator_to_next will clean this up. */ |
| 2523 | *position = start_pos; |
| 2524 | } |
| 2525 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | return space_or_image_found_p; |
| 2530 | } |
| 2531 | |
| 2532 | |
| 2533 | \f |
| 2534 | /*********************************************************************** |
| 2535 | Overlay strings |
| 2536 | ***********************************************************************/ |
| 2537 | |
| 2538 | /* The following structure is used to record overlay strings for |
| 2539 | later sorting in load_overlay_strings. */ |
| 2540 | |
| 2541 | struct overlay_entry |
| 2542 | { |
| 2543 | Lisp_Object string; |
| 2544 | int priority; |
| 2545 | int after_string_p; |
| 2546 | }; |
| 2547 | |
| 2548 | |
| 2549 | /* Set up iterator IT from overlay strings at its current position. |
| 2550 | Called from handle_stop. */ |
| 2551 | |
| 2552 | static enum prop_handled |
| 2553 | handle_overlay_change (it) |
| 2554 | struct it *it; |
| 2555 | { |
| 2556 | /* Overlays are handled in current_buffer only. */ |
| 2557 | if (STRINGP (it->string)) |
| 2558 | return HANDLED_NORMALLY; |
| 2559 | else |
| 2560 | return (get_overlay_strings (it) |
| 2561 | ? HANDLED_RECOMPUTE_PROPS |
| 2562 | : HANDLED_NORMALLY); |
| 2563 | } |
| 2564 | |
| 2565 | |
| 2566 | /* Set up the next overlay string for delivery by IT, if there is an |
| 2567 | overlay string to deliver. Called by set_iterator_to_next when the |
| 2568 | end of the current overlay string is reached. If there are more |
| 2569 | overlay strings to display, IT->string and |
| 2570 | IT->current.overlay_string_index are set appropriately here. |
| 2571 | Otherwise IT->string is set to nil. */ |
| 2572 | |
| 2573 | static void |
| 2574 | next_overlay_string (it) |
| 2575 | struct it *it; |
| 2576 | { |
| 2577 | ++it->current.overlay_string_index; |
| 2578 | if (it->current.overlay_string_index == it->n_overlay_strings) |
| 2579 | { |
| 2580 | /* No more overlay strings. Restore IT's settings to what |
| 2581 | they were before overlay strings were processed, and |
| 2582 | continue to deliver from current_buffer. */ |
| 2583 | pop_it (it); |
| 2584 | xassert (it->stop_charpos >= BEGV |
| 2585 | && it->stop_charpos <= it->end_charpos); |
| 2586 | it->string = Qnil; |
| 2587 | it->current.overlay_string_index = -1; |
| 2588 | SET_TEXT_POS (it->current.string_pos, -1, -1); |
| 2589 | it->n_overlay_strings = 0; |
| 2590 | it->method = next_element_from_buffer; |
| 2591 | } |
| 2592 | else |
| 2593 | { |
| 2594 | /* There are more overlay strings to process. If |
| 2595 | IT->current.overlay_string_index has advanced to a position |
| 2596 | where we must load IT->overlay_strings with more strings, do |
| 2597 | it. */ |
| 2598 | int i = it->current.overlay_string_index % OVERLAY_STRING_CHUNK_SIZE; |
| 2599 | |
| 2600 | if (it->current.overlay_string_index && i == 0) |
| 2601 | load_overlay_strings (it); |
| 2602 | |
| 2603 | /* Initialize IT to deliver display elements from the overlay |
| 2604 | string. */ |
| 2605 | it->string = it->overlay_strings[i]; |
| 2606 | it->multibyte_p = STRING_MULTIBYTE (it->string); |
| 2607 | SET_TEXT_POS (it->current.string_pos, 0, 0); |
| 2608 | it->method = next_element_from_string; |
| 2609 | it->stop_charpos = 0; |
| 2610 | } |
| 2611 | |
| 2612 | CHECK_IT (it); |
| 2613 | } |
| 2614 | |
| 2615 | |
| 2616 | /* Compare two overlay_entry structures E1 and E2. Used as a |
| 2617 | comparison function for qsort in load_overlay_strings. Overlay |
| 2618 | strings for the same position are sorted so that |
| 2619 | |
| 2620 | 1. All after-strings come in front of before-strings. |
| 2621 | |
| 2622 | 2. Within after-strings, strings are sorted so that overlay strings |
| 2623 | from overlays with higher priorities come first. |
| 2624 | |
| 2625 | 2. Within before-strings, strings are sorted so that overlay |
| 2626 | strings from overlays with higher priorities come last. |
| 2627 | |
| 2628 | Value is analogous to strcmp. */ |
| 2629 | |
| 2630 | |
| 2631 | static int |
| 2632 | compare_overlay_entries (e1, e2) |
| 2633 | void *e1, *e2; |
| 2634 | { |
| 2635 | struct overlay_entry *entry1 = (struct overlay_entry *) e1; |
| 2636 | struct overlay_entry *entry2 = (struct overlay_entry *) e2; |
| 2637 | int result; |
| 2638 | |
| 2639 | if (entry1->after_string_p != entry2->after_string_p) |
| 2640 | /* Let after-strings appear in front of before-strings. */ |
| 2641 | result = entry1->after_string_p ? -1 : 1; |
| 2642 | else if (entry1->after_string_p) |
| 2643 | /* After-strings sorted in order of decreasing priority. */ |
| 2644 | result = entry2->priority - entry1->priority; |
| 2645 | else |
| 2646 | /* Before-strings sorted in order of increasing priority. */ |
| 2647 | result = entry1->priority - entry2->priority; |
| 2648 | |
| 2649 | return result; |
| 2650 | } |
| 2651 | |
| 2652 | |
| 2653 | /* Load the vector IT->overlay_strings with overlay strings from IT's |
| 2654 | current buffer position. Set IT->n_overlays to the total number of |
| 2655 | overlay strings found. |
| 2656 | |
| 2657 | Overlay strings are processed OVERLAY_STRING_CHUNK_SIZE strings at |
| 2658 | a time. On entry into load_overlay_strings, |
| 2659 | IT->current.overlay_string_index gives the number of overlay |
| 2660 | strings that have already been loaded by previous calls to this |
| 2661 | function. |
| 2662 | |
| 2663 | Overlay strings are sorted so that after-string strings come in |
| 2664 | front of before-string strings. Within before and after-strings, |
| 2665 | strings are sorted by overlay priority. See also function |
| 2666 | compare_overlay_entries. */ |
| 2667 | |
| 2668 | static void |
| 2669 | load_overlay_strings (it) |
| 2670 | struct it *it; |
| 2671 | { |
| 2672 | extern Lisp_Object Qafter_string, Qbefore_string, Qwindow, Qpriority; |
| 2673 | Lisp_Object ov, overlay, window, str; |
| 2674 | int start, end; |
| 2675 | int size = 20; |
| 2676 | int n = 0, i, j; |
| 2677 | struct overlay_entry *entries |
| 2678 | = (struct overlay_entry *) alloca (size * sizeof *entries); |
| 2679 | |
| 2680 | /* Append the overlay string STRING of overlay OVERLAY to vector |
| 2681 | `entries' which has size `size' and currently contains `n' |
| 2682 | elements. AFTER_P non-zero means STRING is an after-string of |
| 2683 | OVERLAY. */ |
| 2684 | #define RECORD_OVERLAY_STRING(OVERLAY, STRING, AFTER_P) \ |
| 2685 | do \ |
| 2686 | { \ |
| 2687 | Lisp_Object priority; \ |
| 2688 | \ |
| 2689 | if (n == size) \ |
| 2690 | { \ |
| 2691 | int new_size = 2 * size; \ |
| 2692 | struct overlay_entry *old = entries; \ |
| 2693 | entries = \ |
| 2694 | (struct overlay_entry *) alloca (new_size \ |
| 2695 | * sizeof *entries); \ |
| 2696 | bcopy (old, entries, size * sizeof *entries); \ |
| 2697 | size = new_size; \ |
| 2698 | } \ |
| 2699 | \ |
| 2700 | entries[n].string = (STRING); \ |
| 2701 | priority = Foverlay_get ((OVERLAY), Qpriority); \ |
| 2702 | entries[n].priority \ |
| 2703 | = INTEGERP (priority) ? XFASTINT (priority) : 0; \ |
| 2704 | entries[n].after_string_p = (AFTER_P); \ |
| 2705 | ++n; \ |
| 2706 | } \ |
| 2707 | while (0) |
| 2708 | |
| 2709 | /* Process overlay before the overlay center. */ |
| 2710 | for (ov = current_buffer->overlays_before; |
| 2711 | CONSP (ov); |
| 2712 | ov = XCDR (ov)) |
| 2713 | { |
| 2714 | overlay = XCAR (ov); |
| 2715 | xassert (OVERLAYP (overlay)); |
| 2716 | start = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 2717 | end = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 2718 | |
| 2719 | if (end < IT_CHARPOS (*it)) |
| 2720 | break; |
| 2721 | |
| 2722 | /* Skip this overlay if it doesn't start or end at IT's current |
| 2723 | position. */ |
| 2724 | if (end != IT_CHARPOS (*it) && start != IT_CHARPOS (*it)) |
| 2725 | continue; |
| 2726 | |
| 2727 | /* Skip this overlay if it doesn't apply to IT->w. */ |
| 2728 | window = Foverlay_get (overlay, Qwindow); |
| 2729 | if (WINDOWP (window) && XWINDOW (window) != it->w) |
| 2730 | continue; |
| 2731 | |
| 2732 | /* If overlay has a non-empty before-string, record it. */ |
| 2733 | if (start == IT_CHARPOS (*it) |
| 2734 | && (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str)) |
| 2735 | && XSTRING (str)->size) |
| 2736 | RECORD_OVERLAY_STRING (overlay, str, 0); |
| 2737 | |
| 2738 | /* If overlay has a non-empty after-string, record it. */ |
| 2739 | if (end == IT_CHARPOS (*it) |
| 2740 | && (str = Foverlay_get (overlay, Qafter_string), STRINGP (str)) |
| 2741 | && XSTRING (str)->size) |
| 2742 | RECORD_OVERLAY_STRING (overlay, str, 1); |
| 2743 | } |
| 2744 | |
| 2745 | /* Process overlays after the overlay center. */ |
| 2746 | for (ov = current_buffer->overlays_after; |
| 2747 | CONSP (ov); |
| 2748 | ov = XCDR (ov)) |
| 2749 | { |
| 2750 | overlay = XCAR (ov); |
| 2751 | xassert (OVERLAYP (overlay)); |
| 2752 | start = OVERLAY_POSITION (OVERLAY_START (overlay)); |
| 2753 | end = OVERLAY_POSITION (OVERLAY_END (overlay)); |
| 2754 | |
| 2755 | if (start > IT_CHARPOS (*it)) |
| 2756 | break; |
| 2757 | |
| 2758 | /* Skip this overlay if it doesn't start or end at IT's current |
| 2759 | position. */ |
| 2760 | if (end != IT_CHARPOS (*it) && start != IT_CHARPOS (*it)) |
| 2761 | continue; |
| 2762 | |
| 2763 | /* Skip this overlay if it doesn't apply to IT->w. */ |
| 2764 | window = Foverlay_get (overlay, Qwindow); |
| 2765 | if (WINDOWP (window) && XWINDOW (window) != it->w) |
| 2766 | continue; |
| 2767 | |
| 2768 | /* If overlay has a non-empty before-string, record it. */ |
| 2769 | if (start == IT_CHARPOS (*it) |
| 2770 | && (str = Foverlay_get (overlay, Qbefore_string), STRINGP (str)) |
| 2771 | && XSTRING (str)->size) |
| 2772 | RECORD_OVERLAY_STRING (overlay, str, 0); |
| 2773 | |
| 2774 | /* If overlay has a non-empty after-string, record it. */ |
| 2775 | if (end == IT_CHARPOS (*it) |
| 2776 | && (str = Foverlay_get (overlay, Qafter_string), STRINGP (str)) |
| 2777 | && XSTRING (str)->size) |
| 2778 | RECORD_OVERLAY_STRING (overlay, str, 1); |
| 2779 | } |
| 2780 | |
| 2781 | #undef RECORD_OVERLAY_STRING |
| 2782 | |
| 2783 | /* Sort entries. */ |
| 2784 | qsort (entries, n, sizeof *entries, compare_overlay_entries); |
| 2785 | |
| 2786 | /* Record the total number of strings to process. */ |
| 2787 | it->n_overlay_strings = n; |
| 2788 | |
| 2789 | /* IT->current.overlay_string_index is the number of overlay strings |
| 2790 | that have already been consumed by IT. Copy some of the |
| 2791 | remaining overlay strings to IT->overlay_strings. */ |
| 2792 | i = 0; |
| 2793 | j = it->current.overlay_string_index; |
| 2794 | while (i < OVERLAY_STRING_CHUNK_SIZE && j < n) |
| 2795 | it->overlay_strings[i++] = entries[j++].string; |
| 2796 | |
| 2797 | CHECK_IT (it); |
| 2798 | } |
| 2799 | |
| 2800 | |
| 2801 | /* Get the first chunk of overlay strings at IT's current buffer |
| 2802 | position. Value is non-zero if at least one overlay string was |
| 2803 | found. */ |
| 2804 | |
| 2805 | static int |
| 2806 | get_overlay_strings (it) |
| 2807 | struct it *it; |
| 2808 | { |
| 2809 | /* Get the first OVERLAY_STRING_CHUNK_SIZE overlay strings to |
| 2810 | process. This fills IT->overlay_strings with strings, and sets |
| 2811 | IT->n_overlay_strings to the total number of strings to process. |
| 2812 | IT->pos.overlay_string_index has to be set temporarily to zero |
| 2813 | because load_overlay_strings needs this; it must be set to -1 |
| 2814 | when no overlay strings are found because a zero value would |
| 2815 | indicate a position in the first overlay string. */ |
| 2816 | it->current.overlay_string_index = 0; |
| 2817 | load_overlay_strings (it); |
| 2818 | |
| 2819 | /* If we found overlay strings, set up IT to deliver display |
| 2820 | elements from the first one. Otherwise set up IT to deliver |
| 2821 | from current_buffer. */ |
| 2822 | if (it->n_overlay_strings) |
| 2823 | { |
| 2824 | /* Make sure we know settings in current_buffer, so that we can |
| 2825 | restore meaningful values when we're done with the overlay |
| 2826 | strings. */ |
| 2827 | compute_stop_pos (it); |
| 2828 | xassert (it->face_id >= 0); |
| 2829 | |
| 2830 | /* Save IT's settings. They are restored after all overlay |
| 2831 | strings have been processed. */ |
| 2832 | xassert (it->sp == 0); |
| 2833 | push_it (it); |
| 2834 | |
| 2835 | /* Set up IT to deliver display elements from the first overlay |
| 2836 | string. */ |
| 2837 | IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = 0; |
| 2838 | it->stop_charpos = 0; |
| 2839 | it->string = it->overlay_strings[0]; |
| 2840 | it->multibyte_p = STRING_MULTIBYTE (it->string); |
| 2841 | xassert (STRINGP (it->string)); |
| 2842 | it->method = next_element_from_string; |
| 2843 | } |
| 2844 | else |
| 2845 | { |
| 2846 | it->string = Qnil; |
| 2847 | it->current.overlay_string_index = -1; |
| 2848 | it->method = next_element_from_buffer; |
| 2849 | } |
| 2850 | |
| 2851 | CHECK_IT (it); |
| 2852 | |
| 2853 | /* Value is non-zero if we found at least one overlay string. */ |
| 2854 | return STRINGP (it->string); |
| 2855 | } |
| 2856 | |
| 2857 | |
| 2858 | \f |
| 2859 | /*********************************************************************** |
| 2860 | Saving and restoring state |
| 2861 | ***********************************************************************/ |
| 2862 | |
| 2863 | /* Save current settings of IT on IT->stack. Called, for example, |
| 2864 | before setting up IT for an overlay string, to be able to restore |
| 2865 | IT's settings to what they were after the overlay string has been |
| 2866 | processed. */ |
| 2867 | |
| 2868 | static void |
| 2869 | push_it (it) |
| 2870 | struct it *it; |
| 2871 | { |
| 2872 | struct iterator_stack_entry *p; |
| 2873 | |
| 2874 | xassert (it->sp < 2); |
| 2875 | p = it->stack + it->sp; |
| 2876 | |
| 2877 | p->stop_charpos = it->stop_charpos; |
| 2878 | xassert (it->face_id >= 0); |
| 2879 | p->face_id = it->face_id; |
| 2880 | p->string = it->string; |
| 2881 | p->pos = it->current; |
| 2882 | p->end_charpos = it->end_charpos; |
| 2883 | p->string_nchars = it->string_nchars; |
| 2884 | p->area = it->area; |
| 2885 | p->multibyte_p = it->multibyte_p; |
| 2886 | p->space_width = it->space_width; |
| 2887 | p->font_height = it->font_height; |
| 2888 | p->voffset = it->voffset; |
| 2889 | p->string_from_display_prop_p = it->string_from_display_prop_p; |
| 2890 | ++it->sp; |
| 2891 | } |
| 2892 | |
| 2893 | |
| 2894 | /* Restore IT's settings from IT->stack. Called, for example, when no |
| 2895 | more overlay strings must be processed, and we return to delivering |
| 2896 | display elements from a buffer, or when the end of a string from a |
| 2897 | `display' property is reached and we return to delivering display |
| 2898 | elements from an overlay string, or from a buffer. */ |
| 2899 | |
| 2900 | static void |
| 2901 | pop_it (it) |
| 2902 | struct it *it; |
| 2903 | { |
| 2904 | struct iterator_stack_entry *p; |
| 2905 | |
| 2906 | xassert (it->sp > 0); |
| 2907 | --it->sp; |
| 2908 | p = it->stack + it->sp; |
| 2909 | it->stop_charpos = p->stop_charpos; |
| 2910 | it->face_id = p->face_id; |
| 2911 | it->string = p->string; |
| 2912 | it->current = p->pos; |
| 2913 | it->end_charpos = p->end_charpos; |
| 2914 | it->string_nchars = p->string_nchars; |
| 2915 | it->area = p->area; |
| 2916 | it->multibyte_p = p->multibyte_p; |
| 2917 | it->space_width = p->space_width; |
| 2918 | it->font_height = p->font_height; |
| 2919 | it->voffset = p->voffset; |
| 2920 | it->string_from_display_prop_p = p->string_from_display_prop_p; |
| 2921 | } |
| 2922 | |
| 2923 | |
| 2924 | \f |
| 2925 | /*********************************************************************** |
| 2926 | Moving over lines |
| 2927 | ***********************************************************************/ |
| 2928 | |
| 2929 | /* Set IT's current position to the previous line start. */ |
| 2930 | |
| 2931 | static void |
| 2932 | back_to_previous_line_start (it) |
| 2933 | struct it *it; |
| 2934 | { |
| 2935 | IT_CHARPOS (*it) = find_next_newline_no_quit (IT_CHARPOS (*it) - 1, -1); |
| 2936 | IT_BYTEPOS (*it) = CHAR_TO_BYTE (IT_CHARPOS (*it)); |
| 2937 | } |
| 2938 | |
| 2939 | |
| 2940 | /* Set IT's current position to the next line start. */ |
| 2941 | |
| 2942 | static void |
| 2943 | forward_to_next_line_start (it) |
| 2944 | struct it *it; |
| 2945 | { |
| 2946 | IT_CHARPOS (*it) = find_next_newline_no_quit (IT_CHARPOS (*it), 1); |
| 2947 | IT_BYTEPOS (*it) = CHAR_TO_BYTE (IT_CHARPOS (*it)); |
| 2948 | } |
| 2949 | |
| 2950 | |
| 2951 | /* Set IT's current position to the previous visible line start. Skip |
| 2952 | invisible text that is so either due to text properties or due to |
| 2953 | selective display. Caution: this does not change IT->current_x and |
| 2954 | IT->hpos. */ |
| 2955 | |
| 2956 | static void |
| 2957 | back_to_previous_visible_line_start (it) |
| 2958 | struct it *it; |
| 2959 | { |
| 2960 | int visible_p = 0; |
| 2961 | |
| 2962 | /* Go back one newline if not on BEGV already. */ |
| 2963 | if (IT_CHARPOS (*it) > BEGV) |
| 2964 | back_to_previous_line_start (it); |
| 2965 | |
| 2966 | /* Move over lines that are invisible because of selective display |
| 2967 | or text properties. */ |
| 2968 | while (IT_CHARPOS (*it) > BEGV |
| 2969 | && !visible_p) |
| 2970 | { |
| 2971 | visible_p = 1; |
| 2972 | |
| 2973 | /* If selective > 0, then lines indented more than that values |
| 2974 | are invisible. */ |
| 2975 | if (it->selective > 0 |
| 2976 | && indented_beyond_p (IT_CHARPOS (*it), IT_BYTEPOS (*it), |
| 2977 | it->selective)) |
| 2978 | visible_p = 0; |
| 2979 | #ifdef USE_TEXT_PROPERTIES |
| 2980 | else |
| 2981 | { |
| 2982 | Lisp_Object prop; |
| 2983 | |
| 2984 | prop = Fget_char_property (IT_CHARPOS (*it), Qinvisible, it->window); |
| 2985 | if (TEXT_PROP_MEANS_INVISIBLE (prop)) |
| 2986 | visible_p = 0; |
| 2987 | } |
| 2988 | #endif /* USE_TEXT_PROPERTIES */ |
| 2989 | |
| 2990 | /* Back one more newline if the current one is invisible. */ |
| 2991 | if (!visible_p) |
| 2992 | back_to_previous_line_start (it); |
| 2993 | } |
| 2994 | |
| 2995 | xassert (IT_CHARPOS (*it) >= BEGV); |
| 2996 | xassert (IT_CHARPOS (*it) == BEGV |
| 2997 | || FETCH_BYTE (IT_BYTEPOS (*it) - 1) == '\n'); |
| 2998 | CHECK_IT (it); |
| 2999 | } |
| 3000 | |
| 3001 | |
| 3002 | /* Reseat iterator IT at the previous visible line start. Skip |
| 3003 | invisible text that is so either due to text properties or due to |
| 3004 | selective display. At the end, update IT's overlay information, |
| 3005 | face information etc. */ |
| 3006 | |
| 3007 | static void |
| 3008 | reseat_at_previous_visible_line_start (it) |
| 3009 | struct it *it; |
| 3010 | { |
| 3011 | back_to_previous_visible_line_start (it); |
| 3012 | reseat (it, it->current.pos, 1); |
| 3013 | CHECK_IT (it); |
| 3014 | } |
| 3015 | |
| 3016 | |
| 3017 | /* Reseat iterator IT on the next visible line start in the current |
| 3018 | buffer. ON_NEWLINE_P non-zero means position IT on the newline |
| 3019 | preceding the line start. Skip over invisible text that is so |
| 3020 | because of selective display. Compute faces, overlays etc at the |
| 3021 | new position. Note that this function does not skip over text that |
| 3022 | is invisible because of text properties. */ |
| 3023 | |
| 3024 | static void |
| 3025 | reseat_at_next_visible_line_start (it, on_newline_p) |
| 3026 | struct it *it; |
| 3027 | int on_newline_p; |
| 3028 | { |
| 3029 | /* Restore the buffer position when currently not delivering display |
| 3030 | elements from the current buffer. This is the case, for example, |
| 3031 | when called at the end of a truncated overlay string. */ |
| 3032 | while (it->sp) |
| 3033 | pop_it (it); |
| 3034 | it->method = next_element_from_buffer; |
| 3035 | |
| 3036 | /* Otherwise, scan_buffer would not work. */ |
| 3037 | if (IT_CHARPOS (*it) < ZV) |
| 3038 | { |
| 3039 | /* If on a newline, advance past it. Otherwise, find the next |
| 3040 | newline which automatically gives us the position following |
| 3041 | the newline. */ |
| 3042 | if (FETCH_BYTE (IT_BYTEPOS (*it)) == '\n') |
| 3043 | { |
| 3044 | ++IT_CHARPOS (*it); |
| 3045 | ++IT_BYTEPOS (*it); |
| 3046 | } |
| 3047 | else |
| 3048 | forward_to_next_line_start (it); |
| 3049 | |
| 3050 | /* We must either have reached the end of the buffer or end up |
| 3051 | after a newline. */ |
| 3052 | xassert (IT_CHARPOS (*it) == ZV |
| 3053 | || FETCH_BYTE (IT_BYTEPOS (*it) - 1) == '\n'); |
| 3054 | |
| 3055 | /* Skip over lines that are invisible because they are indented |
| 3056 | more than the value of IT->selective. */ |
| 3057 | if (it->selective > 0) |
| 3058 | while (IT_CHARPOS (*it) < ZV |
| 3059 | && indented_beyond_p (IT_CHARPOS (*it), IT_BYTEPOS (*it), |
| 3060 | it->selective)) |
| 3061 | forward_to_next_line_start (it); |
| 3062 | |
| 3063 | /* Position on the newline if we should. */ |
| 3064 | if (on_newline_p && IT_CHARPOS (*it) > BEGV) |
| 3065 | { |
| 3066 | --IT_CHARPOS (*it); |
| 3067 | IT_BYTEPOS (*it) = CHAR_TO_BYTE (IT_CHARPOS (*it)); |
| 3068 | } |
| 3069 | |
| 3070 | /* Set the iterator there. The 0 as the last parameter of |
| 3071 | reseat means don't force a text property lookup. The lookup |
| 3072 | is then only done if we've skipped past the iterator's |
| 3073 | check_charpos'es. This optimization is important because |
| 3074 | text property lookups tend to be expensive. */ |
| 3075 | reseat (it, it->current.pos, 0); |
| 3076 | } |
| 3077 | |
| 3078 | CHECK_IT (it); |
| 3079 | } |
| 3080 | |
| 3081 | |
| 3082 | \f |
| 3083 | /*********************************************************************** |
| 3084 | Changing an iterator's position |
| 3085 | ***********************************************************************/ |
| 3086 | |
| 3087 | /* Change IT's current position to POS in current_buffer. If FORCE_P |
| 3088 | is non-zero, always check for text properties at the new position. |
| 3089 | Otherwise, text properties are only looked up if POS >= |
| 3090 | IT->check_charpos of a property. */ |
| 3091 | |
| 3092 | static void |
| 3093 | reseat (it, pos, force_p) |
| 3094 | struct it *it; |
| 3095 | struct text_pos pos; |
| 3096 | int force_p; |
| 3097 | { |
| 3098 | int original_pos = IT_CHARPOS (*it); |
| 3099 | |
| 3100 | reseat_1 (it, pos, 0); |
| 3101 | |
| 3102 | /* Determine where to check text properties. Avoid doing it |
| 3103 | where possible because text property lookup is very expensive. */ |
| 3104 | if (force_p |
| 3105 | || CHARPOS (pos) > it->stop_charpos |
| 3106 | || CHARPOS (pos) < original_pos) |
| 3107 | handle_stop (it); |
| 3108 | |
| 3109 | CHECK_IT (it); |
| 3110 | } |
| 3111 | |
| 3112 | |
| 3113 | /* Change IT's buffer position to POS. SET_STOP_P non-zero means set |
| 3114 | IT->stop_pos to POS, also. */ |
| 3115 | |
| 3116 | static void |
| 3117 | reseat_1 (it, pos, set_stop_p) |
| 3118 | struct it *it; |
| 3119 | struct text_pos pos; |
| 3120 | int set_stop_p; |
| 3121 | { |
| 3122 | /* Don't call this function when scanning a C string. */ |
| 3123 | xassert (it->s == NULL); |
| 3124 | |
| 3125 | /* POS must be a reasonable value. */ |
| 3126 | xassert (CHARPOS (pos) >= BEGV && CHARPOS (pos) <= ZV); |
| 3127 | |
| 3128 | it->current.pos = it->position = pos; |
| 3129 | XSETBUFFER (it->object, current_buffer); |
| 3130 | it->dpvec = NULL; |
| 3131 | it->current.dpvec_index = -1; |
| 3132 | it->current.overlay_string_index = -1; |
| 3133 | IT_STRING_CHARPOS (*it) = -1; |
| 3134 | IT_STRING_BYTEPOS (*it) = -1; |
| 3135 | it->string = Qnil; |
| 3136 | it->method = next_element_from_buffer; |
| 3137 | it->sp = 0; |
| 3138 | |
| 3139 | if (set_stop_p) |
| 3140 | it->stop_charpos = CHARPOS (pos); |
| 3141 | } |
| 3142 | |
| 3143 | |
| 3144 | /* Set up IT for displaying a string, starting at CHARPOS in window W. |
| 3145 | If S is non-null, it is a C string to iterate over. Otherwise, |
| 3146 | STRING gives a Lisp string to iterate over. |
| 3147 | |
| 3148 | If PRECISION > 0, don't return more then PRECISION number of |
| 3149 | characters from the string. |
| 3150 | |
| 3151 | If FIELD_WIDTH > 0, return padding spaces until FIELD_WIDTH |
| 3152 | characters have been returned. FIELD_WIDTH < 0 means an infinite |
| 3153 | field width. |
| 3154 | |
| 3155 | MULTIBYTE = 0 means disable processing of multibyte characters, |
| 3156 | MULTIBYTE > 0 means enable it, |
| 3157 | MULTIBYTE < 0 means use IT->multibyte_p. |
| 3158 | |
| 3159 | IT must be initialized via a prior call to init_iterator before |
| 3160 | calling this function. */ |
| 3161 | |
| 3162 | static void |
| 3163 | reseat_to_string (it, s, string, charpos, precision, field_width, multibyte) |
| 3164 | struct it *it; |
| 3165 | unsigned char *s; |
| 3166 | Lisp_Object string; |
| 3167 | int charpos; |
| 3168 | int precision, field_width, multibyte; |
| 3169 | { |
| 3170 | /* No region in strings. */ |
| 3171 | it->region_beg_charpos = it->region_end_charpos = -1; |
| 3172 | |
| 3173 | /* No text property checks performed by default, but see below. */ |
| 3174 | it->stop_charpos = -1; |
| 3175 | |
| 3176 | /* Set iterator position and end position. */ |
| 3177 | bzero (&it->current, sizeof it->current); |
| 3178 | it->current.overlay_string_index = -1; |
| 3179 | it->current.dpvec_index = -1; |
| 3180 | it->charset = CHARSET_ASCII; |
| 3181 | xassert (charpos >= 0); |
| 3182 | |
| 3183 | /* Use the setting of MULTIBYTE if specified. */ |
| 3184 | if (multibyte >= 0) |
| 3185 | it->multibyte_p = multibyte > 0; |
| 3186 | |
| 3187 | if (s == NULL) |
| 3188 | { |
| 3189 | xassert (STRINGP (string)); |
| 3190 | it->string = string; |
| 3191 | it->s = NULL; |
| 3192 | it->end_charpos = it->string_nchars = XSTRING (string)->size; |
| 3193 | it->method = next_element_from_string; |
| 3194 | it->current.string_pos = string_pos (charpos, string); |
| 3195 | } |
| 3196 | else |
| 3197 | { |
| 3198 | it->s = s; |
| 3199 | it->string = Qnil; |
| 3200 | |
| 3201 | /* Note that we use IT->current.pos, not it->current.string_pos, |
| 3202 | for displaying C strings. */ |
| 3203 | IT_STRING_CHARPOS (*it) = IT_STRING_BYTEPOS (*it) = -1; |
| 3204 | if (it->multibyte_p) |
| 3205 | { |
| 3206 | it->current.pos = c_string_pos (charpos, s, 1); |
| 3207 | it->end_charpos = it->string_nchars = number_of_chars (s, 1); |
| 3208 | } |
| 3209 | else |
| 3210 | { |
| 3211 | IT_CHARPOS (*it) = IT_BYTEPOS (*it) = charpos; |
| 3212 | it->end_charpos = it->string_nchars = strlen (s); |
| 3213 | } |
| 3214 | |
| 3215 | it->method = next_element_from_c_string; |
| 3216 | } |
| 3217 | |
| 3218 | /* PRECISION > 0 means don't return more than PRECISION characters |
| 3219 | from the string. */ |
| 3220 | if (precision > 0 && it->end_charpos - charpos > precision) |
| 3221 | it->end_charpos = it->string_nchars = charpos + precision; |
| 3222 | |
| 3223 | /* FIELD_WIDTH > 0 means pad with spaces until FIELD_WIDTH |
| 3224 | characters have been returned. FIELD_WIDTH == 0 means don't pad, |
| 3225 | FIELD_WIDTH < 0 means infinite field width. This is useful for |
| 3226 | padding with `-' at the end of a mode line. */ |
| 3227 | if (field_width < 0) |
| 3228 | field_width = INFINITY; |
| 3229 | if (field_width > it->end_charpos - charpos) |
| 3230 | it->end_charpos = charpos + field_width; |
| 3231 | |
| 3232 | /* Use the standard display table for displaying strings. */ |
| 3233 | if (DISP_TABLE_P (Vstandard_display_table)) |
| 3234 | it->dp = XCHAR_TABLE (Vstandard_display_table); |
| 3235 | |
| 3236 | it->stop_charpos = charpos; |
| 3237 | CHECK_IT (it); |
| 3238 | } |
| 3239 | |
| 3240 | |
| 3241 | \f |
| 3242 | /*********************************************************************** |
| 3243 | Iteration |
| 3244 | ***********************************************************************/ |
| 3245 | |
| 3246 | /* Load IT's display element fields with information about the next |
| 3247 | display element from the current position of IT. Value is zero if |
| 3248 | end of buffer (or C string) is reached. */ |
| 3249 | |
| 3250 | int |
| 3251 | get_next_display_element (it) |
| 3252 | struct it *it; |
| 3253 | { |
| 3254 | /* Non-zero means that we found an display element. Zero means that |
| 3255 | we hit the end of what we iterate over. Performance note: the |
| 3256 | function pointer `method' used here turns out to be faster than |
| 3257 | using a sequence of if-statements. */ |
| 3258 | int success_p = (*it->method) (it); |
| 3259 | int charset; |
| 3260 | |
| 3261 | if (it->what == IT_CHARACTER) |
| 3262 | { |
| 3263 | /* Map via display table or translate control characters. |
| 3264 | IT->c, IT->len etc. have been set to the next character by |
| 3265 | the function call above. If we have a display table, and it |
| 3266 | contains an entry for IT->c, translate it. Don't do this if |
| 3267 | IT->c itself comes from a display table, otherwise we could |
| 3268 | end up in an infinite recursion. (An alternative could be to |
| 3269 | count the recursion depth of this function and signal an |
| 3270 | error when a certain maximum depth is reached.) Is it worth |
| 3271 | it? */ |
| 3272 | if (success_p && it->dpvec == NULL) |
| 3273 | { |
| 3274 | Lisp_Object dv; |
| 3275 | |
| 3276 | if (it->dp |
| 3277 | && (dv = DISP_CHAR_VECTOR (it->dp, it->c), |
| 3278 | VECTORP (dv))) |
| 3279 | { |
| 3280 | struct Lisp_Vector *v = XVECTOR (dv); |
| 3281 | |
| 3282 | /* Return the first character from the display table |
| 3283 | entry, if not empty. If empty, don't display the |
| 3284 | current character. */ |
| 3285 | if (v->size) |
| 3286 | { |
| 3287 | it->dpvec_char_len = it->len; |
| 3288 | it->dpvec = v->contents; |
| 3289 | it->dpend = v->contents + v->size; |
| 3290 | it->current.dpvec_index = 0; |
| 3291 | it->method = next_element_from_display_vector; |
| 3292 | } |
| 3293 | |
| 3294 | success_p = get_next_display_element (it); |
| 3295 | } |
| 3296 | |
| 3297 | /* Translate control characters into `\003' or `^C' form. |
| 3298 | Control characters coming from a display table entry are |
| 3299 | currently not translated because we use IT->dpvec to hold |
| 3300 | the translation. This could easily be changed but I |
| 3301 | don't believe that it is worth doing. |
| 3302 | |
| 3303 | Non-printable multibyte characters are also translated |
| 3304 | octal form. */ |
| 3305 | else if ((it->c < ' ' |
| 3306 | && (it->area != TEXT_AREA |
| 3307 | || (it->c != '\n' && it->c != '\t'))) |
| 3308 | || (it->c >= 127 |
| 3309 | && it->len == 1) |
| 3310 | || !CHAR_PRINTABLE_P (it->c)) |
| 3311 | { |
| 3312 | /* IT->c is a control character which must be displayed |
| 3313 | either as '\003' or as `^C' where the '\\' and '^' |
| 3314 | can be defined in the display table. Fill |
| 3315 | IT->ctl_chars with glyphs for what we have to |
| 3316 | display. Then, set IT->dpvec to these glyphs. */ |
| 3317 | GLYPH g; |
| 3318 | |
| 3319 | if (it->c < 128 && it->ctl_arrow_p) |
| 3320 | { |
| 3321 | /* Set IT->ctl_chars[0] to the glyph for `^'. */ |
| 3322 | if (it->dp |
| 3323 | && INTEGERP (DISP_CTRL_GLYPH (it->dp)) |
| 3324 | && GLYPH_CHAR_VALID_P (XINT (DISP_CTRL_GLYPH (it->dp)))) |
| 3325 | g = XINT (DISP_CTRL_GLYPH (it->dp)); |
| 3326 | else |
| 3327 | g = FAST_MAKE_GLYPH ('^', 0); |
| 3328 | XSETINT (it->ctl_chars[0], g); |
| 3329 | |
| 3330 | g = FAST_MAKE_GLYPH (it->c ^ 0100, 0); |
| 3331 | XSETINT (it->ctl_chars[1], g); |
| 3332 | |
| 3333 | /* Set up IT->dpvec and return first character from it. */ |
| 3334 | it->dpvec_char_len = it->len; |
| 3335 | it->dpvec = it->ctl_chars; |
| 3336 | it->dpend = it->dpvec + 2; |
| 3337 | it->current.dpvec_index = 0; |
| 3338 | it->method = next_element_from_display_vector; |
| 3339 | get_next_display_element (it); |
| 3340 | } |
| 3341 | else |
| 3342 | { |
| 3343 | unsigned char work[4], *str; |
| 3344 | int len = CHAR_STRING (it->c, work, str); |
| 3345 | int i; |
| 3346 | GLYPH escape_glyph; |
| 3347 | |
| 3348 | /* Set IT->ctl_chars[0] to the glyph for `\\'. */ |
| 3349 | if (it->dp |
| 3350 | && INTEGERP (DISP_ESCAPE_GLYPH (it->dp)) |
| 3351 | && GLYPH_CHAR_VALID_P (XFASTINT (DISP_ESCAPE_GLYPH (it->dp)))) |
| 3352 | escape_glyph = XFASTINT (DISP_ESCAPE_GLYPH (it->dp)); |
| 3353 | else |
| 3354 | escape_glyph = FAST_MAKE_GLYPH ('\\', 0); |
| 3355 | |
| 3356 | for (i = 0; i < len; i++) |
| 3357 | { |
| 3358 | XSETINT (it->ctl_chars[i * 4], escape_glyph); |
| 3359 | /* Insert three more glyphs into IT->ctl_chars for |
| 3360 | the octal display of the character. */ |
| 3361 | g = FAST_MAKE_GLYPH (((str[i] >> 6) & 7) + '0', 0); |
| 3362 | XSETINT (it->ctl_chars[i * 4 + 1], g); |
| 3363 | g = FAST_MAKE_GLYPH (((str[i] >> 3) & 7) + '0', 0); |
| 3364 | XSETINT (it->ctl_chars[i * 4 + 2], g); |
| 3365 | g = FAST_MAKE_GLYPH ((str[i] & 7) + '0', 0); |
| 3366 | XSETINT (it->ctl_chars[i * 4 + 3], g); |
| 3367 | } |
| 3368 | |
| 3369 | /* Set up IT->dpvec and return the first character |
| 3370 | from it. */ |
| 3371 | it->dpvec_char_len = it->len; |
| 3372 | it->dpvec = it->ctl_chars; |
| 3373 | it->dpend = it->dpvec + len * 4; |
| 3374 | it->current.dpvec_index = 0; |
| 3375 | it->method = next_element_from_display_vector; |
| 3376 | get_next_display_element (it); |
| 3377 | } |
| 3378 | } |
| 3379 | } |
| 3380 | |
| 3381 | /* Adjust face id if charset changes. There are no charset |
| 3382 | changes in unibyte text because Emacs' charsets are not |
| 3383 | applicable there. */ |
| 3384 | if (it->multibyte_p |
| 3385 | && success_p |
| 3386 | && (charset = CHAR_CHARSET (it->c), |
| 3387 | charset != it->charset)) |
| 3388 | { |
| 3389 | it->charset = charset; |
| 3390 | it->face_id = FACE_FOR_CHARSET (it->f, it->face_id, charset); |
| 3391 | } |
| 3392 | } |
| 3393 | |
| 3394 | /* Is this character the last one of a run of characters with |
| 3395 | box? If yes, set IT->end_of_box_run_p to 1. */ |
| 3396 | if (it->face_box_p |
| 3397 | && it->s == NULL) |
| 3398 | { |
| 3399 | int face_id; |
| 3400 | struct face *face; |
| 3401 | |
| 3402 | it->end_of_box_run_p |
| 3403 | = ((face_id = face_after_it_pos (it), |
| 3404 | face_id != it->face_id) |
| 3405 | && (face = FACE_FROM_ID (it->f, face_id), |
| 3406 | face->box == FACE_NO_BOX)); |
| 3407 | } |
| 3408 | |
| 3409 | /* Value is 0 if end of buffer or string reached. */ |
| 3410 | return success_p; |
| 3411 | } |
| 3412 | |
| 3413 | |
| 3414 | /* Move IT to the next display element. |
| 3415 | |
| 3416 | Functions get_next_display_element and set_iterator_to_next are |
| 3417 | separate because I find this arrangement easier to handle than a |
| 3418 | get_next_display_element function that also increments IT's |
| 3419 | position. The way it is we can first look at an iterator's current |
| 3420 | display element, decide whether it fits on a line, and if it does, |
| 3421 | increment the iterator position. The other way around we probably |
| 3422 | would either need a flag indicating whether the iterator has to be |
| 3423 | incremented the next time, or we would have to implement a |
| 3424 | decrement position function which would not be easy to write. */ |
| 3425 | |
| 3426 | void |
| 3427 | set_iterator_to_next (it) |
| 3428 | struct it *it; |
| 3429 | { |
| 3430 | if (it->method == next_element_from_buffer) |
| 3431 | { |
| 3432 | /* The current display element of IT is a character from |
| 3433 | current_buffer. Advance in the buffer, and maybe skip over |
| 3434 | invisible lines that are so because of selective display. */ |
| 3435 | if (ITERATOR_AT_END_OF_LINE_P (it)) |
| 3436 | reseat_at_next_visible_line_start (it, 0); |
| 3437 | else |
| 3438 | { |
| 3439 | xassert (it->len != 0); |
| 3440 | IT_BYTEPOS (*it) += it->len; |
| 3441 | IT_CHARPOS (*it) += 1; |
| 3442 | xassert (IT_BYTEPOS (*it) == CHAR_TO_BYTE (IT_CHARPOS (*it))); |
| 3443 | } |
| 3444 | } |
| 3445 | else if (it->method == next_element_from_c_string) |
| 3446 | { |
| 3447 | /* Current display element of IT is from a C string. */ |
| 3448 | IT_BYTEPOS (*it) += it->len; |
| 3449 | IT_CHARPOS (*it) += 1; |
| 3450 | } |
| 3451 | else if (it->method == next_element_from_display_vector) |
| 3452 | { |
| 3453 | /* Current display element of IT is from a display table entry. |
| 3454 | Advance in the display table definition. Reset it to null if |
| 3455 | end reached, and continue with characters from buffers/ |
| 3456 | strings. */ |
| 3457 | ++it->current.dpvec_index; |
| 3458 | |
| 3459 | /* Restore face and charset of the iterator to what they were |
| 3460 | before the display vector entry (these entries may contain |
| 3461 | faces, and of course characters of different charsets). */ |
| 3462 | it->face_id = it->saved_face_id; |
| 3463 | it->charset = FACE_FROM_ID (it->f, it->face_id)->charset; |
| 3464 | |
| 3465 | if (it->dpvec + it->current.dpvec_index == it->dpend) |
| 3466 | { |
| 3467 | if (it->s) |
| 3468 | it->method = next_element_from_c_string; |
| 3469 | else if (STRINGP (it->string)) |
| 3470 | it->method = next_element_from_string; |
| 3471 | else |
| 3472 | it->method = next_element_from_buffer; |
| 3473 | |
| 3474 | it->dpvec = NULL; |
| 3475 | it->current.dpvec_index = -1; |
| 3476 | |
| 3477 | /* Skip over characters which were displayed via IT->dpvec. */ |
| 3478 | if (it->dpvec_char_len < 0) |
| 3479 | reseat_at_next_visible_line_start (it, 1); |
| 3480 | else if (it->dpvec_char_len > 0) |
| 3481 | { |
| 3482 | it->len = it->dpvec_char_len; |
| 3483 | set_iterator_to_next (it); |
| 3484 | } |
| 3485 | } |
| 3486 | } |
| 3487 | else if (it->method == next_element_from_string) |
| 3488 | { |
| 3489 | /* Current display element is a character from a Lisp string. */ |
| 3490 | xassert (it->s == NULL && STRINGP (it->string)); |
| 3491 | IT_STRING_BYTEPOS (*it) += it->len; |
| 3492 | IT_STRING_CHARPOS (*it) += 1; |
| 3493 | |
| 3494 | consider_string_end: |
| 3495 | |
| 3496 | if (it->current.overlay_string_index >= 0) |
| 3497 | { |
| 3498 | /* IT->string is an overlay string. Advance to the |
| 3499 | next, if there is one. */ |
| 3500 | if (IT_STRING_CHARPOS (*it) >= XSTRING (it->string)->size) |
| 3501 | next_overlay_string (it); |
| 3502 | } |
| 3503 | else |
| 3504 | { |
| 3505 | /* IT->string is not an overlay string. If we reached |
| 3506 | its end, and there is something on IT->stack, proceed |
| 3507 | with what is on the stack. This can be either another |
| 3508 | string, this time an overlay string, or a buffer. */ |
| 3509 | if (IT_STRING_CHARPOS (*it) == XSTRING (it->string)->size |
| 3510 | && it->sp > 0) |
| 3511 | { |
| 3512 | pop_it (it); |
| 3513 | if (!STRINGP (it->string)) |
| 3514 | it->method = next_element_from_buffer; |
| 3515 | } |
| 3516 | } |
| 3517 | } |
| 3518 | else if (it->method == next_element_from_image |
| 3519 | || it->method == next_element_from_stretch) |
| 3520 | { |
| 3521 | /* The position etc with which we have to proceed are on |
| 3522 | the stack. The position may be at the end of a string, |
| 3523 | if the `display' property takes up the whole string. */ |
| 3524 | pop_it (it); |
| 3525 | it->image_id = 0; |
| 3526 | if (STRINGP (it->string)) |
| 3527 | { |
| 3528 | it->method = next_element_from_string; |
| 3529 | goto consider_string_end; |
| 3530 | } |
| 3531 | else |
| 3532 | it->method = next_element_from_buffer; |
| 3533 | } |
| 3534 | else |
| 3535 | /* There are no other methods defined, so this should be a bug. */ |
| 3536 | abort (); |
| 3537 | |
| 3538 | /* Reset flags indicating start and end of a sequence of |
| 3539 | characters with box. */ |
| 3540 | it->start_of_box_run_p = it->end_of_box_run_p = 0; |
| 3541 | |
| 3542 | xassert (it->method != next_element_from_string |
| 3543 | || (STRINGP (it->string) |
| 3544 | && IT_STRING_CHARPOS (*it) >= 0)); |
| 3545 | } |
| 3546 | |
| 3547 | |
| 3548 | /* Load IT's display element fields with information about the next |
| 3549 | display element which comes from a display table entry or from the |
| 3550 | result of translating a control character to one of the forms `^C' |
| 3551 | or `\003'. IT->dpvec holds the glyphs to return as characters. */ |
| 3552 | |
| 3553 | static int |
| 3554 | next_element_from_display_vector (it) |
| 3555 | struct it *it; |
| 3556 | { |
| 3557 | /* Precondition. */ |
| 3558 | xassert (it->dpvec && it->current.dpvec_index >= 0); |
| 3559 | |
| 3560 | /* Remember the current face id in case glyphs specify faces. |
| 3561 | IT's face is restored in set_iterator_to_next. */ |
| 3562 | it->saved_face_id = it->face_id; |
| 3563 | |
| 3564 | if (INTEGERP (*it->dpvec) |
| 3565 | && GLYPH_CHAR_VALID_P (XFASTINT (*it->dpvec))) |
| 3566 | { |
| 3567 | int lface_id; |
| 3568 | GLYPH g; |
| 3569 | |
| 3570 | g = XFASTINT (it->dpvec[it->current.dpvec_index]); |
| 3571 | it->c = FAST_GLYPH_CHAR (g); |
| 3572 | it->len = CHAR_LEN (it->c); |
| 3573 | |
| 3574 | /* The entry may contain a face id to use. Such a face id is |
| 3575 | the id of a Lisp face, not a realized face. A face id of |
| 3576 | zero means no face. */ |
| 3577 | lface_id = FAST_GLYPH_FACE (g); |
| 3578 | if (lface_id) |
| 3579 | { |
| 3580 | int face_id = ascii_face_of_lisp_face (it->f, lface_id); |
| 3581 | if (face_id >= 0) |
| 3582 | { |
| 3583 | it->face_id = face_id; |
| 3584 | it->charset = CHARSET_ASCII; |
| 3585 | } |
| 3586 | } |
| 3587 | } |
| 3588 | else |
| 3589 | /* Display table entry is invalid. Return a space. */ |
| 3590 | it->c = ' ', it->len = 1; |
| 3591 | |
| 3592 | /* Don't change position and object of the iterator here. They are |
| 3593 | still the values of the character that had this display table |
| 3594 | entry or was translated, and that's what we want. */ |
| 3595 | it->what = IT_CHARACTER; |
| 3596 | return 1; |
| 3597 | } |
| 3598 | |
| 3599 | |
| 3600 | /* Load IT with the next display element from Lisp string IT->string. |
| 3601 | IT->current.string_pos is the current position within the string. |
| 3602 | If IT->current.overlay_string_index >= 0, the Lisp string is an |
| 3603 | overlay string. */ |
| 3604 | |
| 3605 | static int |
| 3606 | next_element_from_string (it) |
| 3607 | struct it *it; |
| 3608 | { |
| 3609 | struct text_pos position; |
| 3610 | |
| 3611 | xassert (STRINGP (it->string)); |
| 3612 | xassert (IT_STRING_CHARPOS (*it) >= 0); |
| 3613 | position = it->current.string_pos; |
| 3614 | |
| 3615 | /* Time to check for invisible text? */ |
| 3616 | if (IT_STRING_CHARPOS (*it) < it->end_charpos |
| 3617 | && IT_STRING_CHARPOS (*it) == it->stop_charpos) |
| 3618 | { |
| 3619 | handle_stop (it); |
| 3620 | |
| 3621 | /* Since a handler may have changed IT->method, we must |
| 3622 | recurse here. */ |
| 3623 | return get_next_display_element (it); |
| 3624 | } |
| 3625 | |
| 3626 | if (it->current.overlay_string_index >= 0) |
| 3627 | { |
| 3628 | /* Get the next character from an overlay string. In overlay |
| 3629 | strings, There is no field width or padding with spaces to |
| 3630 | do. */ |
| 3631 | if (IT_STRING_CHARPOS (*it) >= XSTRING (it->string)->size) |
| 3632 | { |
| 3633 | it->what = IT_EOB; |
| 3634 | return 0; |
| 3635 | } |
| 3636 | else if (STRING_MULTIBYTE (it->string)) |
| 3637 | { |
| 3638 | int remaining = (STRING_BYTES (XSTRING (it->string)) |
| 3639 | - IT_STRING_BYTEPOS (*it)); |
| 3640 | unsigned char *s = (XSTRING (it->string)->data |
| 3641 | + IT_STRING_BYTEPOS (*it)); |
| 3642 | it->c = string_char_and_length (s, remaining, &it->len); |
| 3643 | } |
| 3644 | else |
| 3645 | { |
| 3646 | it->c = XSTRING (it->string)->data[IT_STRING_BYTEPOS (*it)]; |
| 3647 | it->len = 1; |
| 3648 | } |
| 3649 | } |
| 3650 | else |
| 3651 | { |
| 3652 | /* Get the next character from a Lisp string that is not an |
| 3653 | overlay string. Such strings come from the mode line, for |
| 3654 | example. We may have to pad with spaces, or truncate the |
| 3655 | string. See also next_element_from_c_string. */ |
| 3656 | if (IT_STRING_CHARPOS (*it) >= it->end_charpos) |
| 3657 | { |
| 3658 | it->what = IT_EOB; |
| 3659 | return 0; |
| 3660 | } |
| 3661 | else if (IT_STRING_CHARPOS (*it) >= it->string_nchars) |
| 3662 | { |
| 3663 | /* Pad with spaces. */ |
| 3664 | it->c = ' ', it->len = 1; |
| 3665 | CHARPOS (position) = BYTEPOS (position) = -1; |
| 3666 | } |
| 3667 | else if (STRING_MULTIBYTE (it->string)) |
| 3668 | { |
| 3669 | int maxlen = (STRING_BYTES (XSTRING (it->string)) |
| 3670 | - IT_STRING_BYTEPOS (*it)); |
| 3671 | unsigned char *s = (XSTRING (it->string)->data |
| 3672 | + IT_STRING_BYTEPOS (*it)); |
| 3673 | it->c = string_char_and_length (s, maxlen, &it->len); |
| 3674 | } |
| 3675 | else |
| 3676 | { |
| 3677 | it->c = XSTRING (it->string)->data[IT_STRING_BYTEPOS (*it)]; |
| 3678 | it->len = 1; |
| 3679 | } |
| 3680 | } |
| 3681 | |
| 3682 | /* Record what we have and where it came from. Note that we store a |
| 3683 | buffer position in IT->position although it could arguably be a |
| 3684 | string position. */ |
| 3685 | it->what = IT_CHARACTER; |
| 3686 | it->object = it->string; |
| 3687 | it->position = position; |
| 3688 | return 1; |
| 3689 | } |
| 3690 | |
| 3691 | |
| 3692 | /* Load IT with next display element from C string IT->s. |
| 3693 | IT->string_nchars is the maximum number of characters to return |
| 3694 | from the string. IT->end_charpos may be greater than |
| 3695 | IT->string_nchars when this function is called, in which case we |
| 3696 | may have to return padding spaces. Value is zero if end of string |
| 3697 | reached, including padding spaces. */ |
| 3698 | |
| 3699 | static int |
| 3700 | next_element_from_c_string (it) |
| 3701 | struct it *it; |
| 3702 | { |
| 3703 | int success_p = 1; |
| 3704 | |
| 3705 | xassert (it->s); |
| 3706 | it->what = IT_CHARACTER; |
| 3707 | BYTEPOS (it->position) = CHARPOS (it->position) = 0; |
| 3708 | it->object = Qnil; |
| 3709 | |
| 3710 | /* IT's position can be greater IT->string_nchars in case a field |
| 3711 | width or precision has been specified when the iterator was |
| 3712 | initialized. */ |
| 3713 | if (IT_CHARPOS (*it) >= it->end_charpos) |
| 3714 | { |
| 3715 | /* End of the game. */ |
| 3716 | it->what = IT_EOB; |
| 3717 | success_p = 0; |
| 3718 | } |
| 3719 | else if (IT_CHARPOS (*it) >= it->string_nchars) |
| 3720 | { |
| 3721 | /* Pad with spaces. */ |
| 3722 | it->c = ' ', it->len = 1; |
| 3723 | BYTEPOS (it->position) = CHARPOS (it->position) = -1; |
| 3724 | } |
| 3725 | else if (it->multibyte_p) |
| 3726 | { |
| 3727 | /* Implementation note: The calls to strlen apparently aren't a |
| 3728 | performance problem because there is no noticeable performance |
| 3729 | difference between Emacs running in unibyte or multibyte mode. */ |
| 3730 | int maxlen = strlen (it->s) - IT_BYTEPOS (*it); |
| 3731 | it->c = string_char_and_length (it->s + IT_BYTEPOS (*it), |
| 3732 | maxlen, &it->len); |
| 3733 | } |
| 3734 | else |
| 3735 | it->c = it->s[IT_BYTEPOS (*it)], it->len = 1; |
| 3736 | |
| 3737 | return success_p; |
| 3738 | } |
| 3739 | |
| 3740 | |
| 3741 | /* Set up IT to return characters from an ellipsis, if appropriate. |
| 3742 | The definition of the ellipsis glyphs may come from a display table |
| 3743 | entry. This function Fills IT with the first glyph from the |
| 3744 | ellipsis if an ellipsis is to be displayed. */ |
| 3745 | |
| 3746 | static void |
| 3747 | next_element_from_ellipsis (it) |
| 3748 | struct it *it; |
| 3749 | { |
| 3750 | if (it->dp && VECTORP (DISP_INVIS_VECTOR (it->dp))) |
| 3751 | { |
| 3752 | /* Use the display table definition for `...'. Invalid glyphs |
| 3753 | will be handled by the method returning elements from dpvec. */ |
| 3754 | struct Lisp_Vector *v = XVECTOR (DISP_INVIS_VECTOR (it->dp)); |
| 3755 | it->dpvec_char_len = it->len; |
| 3756 | it->dpvec = v->contents; |
| 3757 | it->dpend = v->contents + v->size; |
| 3758 | it->current.dpvec_index = 0; |
| 3759 | it->method = next_element_from_display_vector; |
| 3760 | get_next_display_element (it); |
| 3761 | } |
| 3762 | else if (it->selective_display_ellipsis_p) |
| 3763 | { |
| 3764 | /* Use default `...' which is stored in default_invis_vector. */ |
| 3765 | it->dpvec_char_len = it->len; |
| 3766 | it->dpvec = default_invis_vector; |
| 3767 | it->dpend = default_invis_vector + 3; |
| 3768 | it->current.dpvec_index = 0; |
| 3769 | it->method = next_element_from_display_vector; |
| 3770 | get_next_display_element (it); |
| 3771 | } |
| 3772 | } |
| 3773 | |
| 3774 | |
| 3775 | /* Deliver an image display element. The iterator IT is already |
| 3776 | filled with image information (done in handle_display_prop). Value |
| 3777 | is always 1. */ |
| 3778 | |
| 3779 | |
| 3780 | static int |
| 3781 | next_element_from_image (it) |
| 3782 | struct it *it; |
| 3783 | { |
| 3784 | it->what = IT_IMAGE; |
| 3785 | return 1; |
| 3786 | } |
| 3787 | |
| 3788 | |
| 3789 | /* Fill iterator IT with next display element from a stretch glyph |
| 3790 | property. IT->object is the value of the text property. Value is |
| 3791 | always 1. */ |
| 3792 | |
| 3793 | static int |
| 3794 | next_element_from_stretch (it) |
| 3795 | struct it *it; |
| 3796 | { |
| 3797 | it->what = IT_STRETCH; |
| 3798 | return 1; |
| 3799 | } |
| 3800 | |
| 3801 | |
| 3802 | /* Load IT with the next display element from current_buffer. Value |
| 3803 | is zero if end of buffer reached. IT->stop_charpos is the next |
| 3804 | position at which to stop and check for text properties or buffer |
| 3805 | end. */ |
| 3806 | |
| 3807 | static int |
| 3808 | next_element_from_buffer (it) |
| 3809 | struct it *it; |
| 3810 | { |
| 3811 | int success_p = 1; |
| 3812 | |
| 3813 | /* Check this assumption, otherwise, we would never enter the |
| 3814 | if-statement, below. */ |
| 3815 | xassert (IT_CHARPOS (*it) >= BEGV |
| 3816 | && IT_CHARPOS (*it) <= it->stop_charpos); |
| 3817 | |
| 3818 | if (IT_CHARPOS (*it) >= it->stop_charpos) |
| 3819 | { |
| 3820 | if (IT_CHARPOS (*it) >= it->end_charpos) |
| 3821 | { |
| 3822 | int overlay_strings_follow_p; |
| 3823 | |
| 3824 | /* End of the game, except when overlay strings follow that |
| 3825 | haven't been returned yet. */ |
| 3826 | if (it->overlay_strings_at_end_processed_p) |
| 3827 | overlay_strings_follow_p = 0; |
| 3828 | else |
| 3829 | { |
| 3830 | it->overlay_strings_at_end_processed_p = 1; |
| 3831 | overlay_strings_follow_p |
| 3832 | = get_overlay_strings (it); |
| 3833 | } |
| 3834 | |
| 3835 | if (overlay_strings_follow_p) |
| 3836 | success_p = get_next_display_element (it); |
| 3837 | else |
| 3838 | { |
| 3839 | it->what = IT_EOB; |
| 3840 | it->position = it->current.pos; |
| 3841 | success_p = 0; |
| 3842 | } |
| 3843 | } |
| 3844 | else |
| 3845 | { |
| 3846 | handle_stop (it); |
| 3847 | return get_next_display_element (it); |
| 3848 | } |
| 3849 | } |
| 3850 | else |
| 3851 | { |
| 3852 | /* No face changes, overlays etc. in sight, so just return a |
| 3853 | character from current_buffer. */ |
| 3854 | unsigned char *p; |
| 3855 | |
| 3856 | /* Maybe run the redisplay end trigger hook. Performance note: |
| 3857 | This doesn't seem to cost measurable time. */ |
| 3858 | if (it->redisplay_end_trigger_charpos |
| 3859 | && it->glyph_row |
| 3860 | && IT_CHARPOS (*it) >= it->redisplay_end_trigger_charpos) |
| 3861 | run_redisplay_end_trigger_hook (it); |
| 3862 | |
| 3863 | /* Get the next character, maybe multibyte. */ |
| 3864 | p = BYTE_POS_ADDR (IT_BYTEPOS (*it)); |
| 3865 | if (it->multibyte_p) |
| 3866 | { |
| 3867 | int maxlen = ((IT_BYTEPOS (*it) >= GPT_BYTE ? ZV_BYTE : GPT_BYTE) |
| 3868 | - IT_BYTEPOS (*it)); |
| 3869 | it->c = string_char_and_length (p, maxlen, &it->len); |
| 3870 | } |
| 3871 | else |
| 3872 | it->c = *p, it->len = 1; |
| 3873 | |
| 3874 | /* Record what we have and where it came from. */ |
| 3875 | it->what = IT_CHARACTER;; |
| 3876 | it->object = it->w->buffer; |
| 3877 | it->position = it->current.pos; |
| 3878 | |
| 3879 | /* Normally we return the character found above, except when we |
| 3880 | really want to return an ellipsis for selective display. */ |
| 3881 | if (it->selective) |
| 3882 | { |
| 3883 | if (it->c == '\n') |
| 3884 | { |
| 3885 | /* A value of selective > 0 means hide lines indented more |
| 3886 | than that number of columns. */ |
| 3887 | if (it->selective > 0 |
| 3888 | && IT_CHARPOS (*it) + 1 < ZV |
| 3889 | && indented_beyond_p (IT_CHARPOS (*it) + 1, |
| 3890 | IT_BYTEPOS (*it) + 1, |
| 3891 | it->selective)) |
| 3892 | { |
| 3893 | next_element_from_ellipsis (it); |
| 3894 | it->dpvec_char_len = -1; |
| 3895 | } |
| 3896 | } |
| 3897 | else if (it->c == '\r' && it->selective == -1) |
| 3898 | { |
| 3899 | /* A value of selective == -1 means that everything from the |
| 3900 | CR to the end of the line is invisible, with maybe an |
| 3901 | ellipsis displayed for it. */ |
| 3902 | next_element_from_ellipsis (it); |
| 3903 | it->dpvec_char_len = -1; |
| 3904 | } |
| 3905 | } |
| 3906 | } |
| 3907 | |
| 3908 | /* Value is zero if end of buffer reached. */ |
| 3909 | xassert (!success_p || it->len > 0); |
| 3910 | return success_p; |
| 3911 | } |
| 3912 | |
| 3913 | |
| 3914 | /* Run the redisplay end trigger hook for IT. */ |
| 3915 | |
| 3916 | static void |
| 3917 | run_redisplay_end_trigger_hook (it) |
| 3918 | struct it *it; |
| 3919 | { |
| 3920 | Lisp_Object args[3]; |
| 3921 | |
| 3922 | /* IT->glyph_row should be non-null, i.e. we should be actually |
| 3923 | displaying something, or otherwise we should not run the hook. */ |
| 3924 | xassert (it->glyph_row); |
| 3925 | |
| 3926 | /* Set up hook arguments. */ |
| 3927 | args[0] = Qredisplay_end_trigger_functions; |
| 3928 | args[1] = it->window; |
| 3929 | XSETINT (args[2], it->redisplay_end_trigger_charpos); |
| 3930 | it->redisplay_end_trigger_charpos = 0; |
| 3931 | |
| 3932 | /* Since we are *trying* to run these functions, don't try to run |
| 3933 | them again, even if they get an error. */ |
| 3934 | it->w->redisplay_end_trigger = Qnil; |
| 3935 | Frun_hook_with_args (3, args); |
| 3936 | |
| 3937 | /* Notice if it changed the face of the character we are on. */ |
| 3938 | handle_face_prop (it); |
| 3939 | } |
| 3940 | |
| 3941 | |
| 3942 | \f |
| 3943 | /*********************************************************************** |
| 3944 | Moving an iterator without producing glyphs |
| 3945 | ***********************************************************************/ |
| 3946 | |
| 3947 | /* Move iterator IT to a specified buffer or X position within one |
| 3948 | line on the display without producing glyphs. |
| 3949 | |
| 3950 | Begin to skip at IT's current position. Skip to TO_CHARPOS or TO_X |
| 3951 | whichever is reached first. |
| 3952 | |
| 3953 | TO_CHARPOS <= 0 means no TO_CHARPOS is specified. |
| 3954 | |
| 3955 | TO_X < 0 means that no TO_X is specified. TO_X is normally a value |
| 3956 | 0 <= TO_X <= IT->last_visible_x. This means in particular, that |
| 3957 | TO_X includes the amount by which a window is horizontally |
| 3958 | scrolled. |
| 3959 | |
| 3960 | Value is |
| 3961 | |
| 3962 | MOVE_POS_MATCH_OR_ZV |
| 3963 | - when TO_POS or ZV was reached. |
| 3964 | |
| 3965 | MOVE_X_REACHED |
| 3966 | -when TO_X was reached before TO_POS or ZV were reached. |
| 3967 | |
| 3968 | MOVE_LINE_CONTINUED |
| 3969 | - when we reached the end of the display area and the line must |
| 3970 | be continued. |
| 3971 | |
| 3972 | MOVE_LINE_TRUNCATED |
| 3973 | - when we reached the end of the display area and the line is |
| 3974 | truncated. |
| 3975 | |
| 3976 | MOVE_NEWLINE_OR_CR |
| 3977 | - when we stopped at a line end, i.e. a newline or a CR and selective |
| 3978 | display is on. */ |
| 3979 | |
| 3980 | static enum move_it_result |
| 3981 | move_it_in_display_line_to (it, to_charpos, to_x, op) |
| 3982 | struct it *it; |
| 3983 | int to_charpos, to_x, op; |
| 3984 | { |
| 3985 | enum move_it_result result = MOVE_UNDEFINED; |
| 3986 | struct glyph_row *saved_glyph_row; |
| 3987 | |
| 3988 | /* Don't produce glyphs in produce_glyphs. */ |
| 3989 | saved_glyph_row = it->glyph_row; |
| 3990 | it->glyph_row = NULL; |
| 3991 | |
| 3992 | while (1) |
| 3993 | { |
| 3994 | int x, i; |
| 3995 | |
| 3996 | /* Stop when ZV or TO_CHARPOS reached. */ |
| 3997 | if (!get_next_display_element (it) |
| 3998 | || ((op & MOVE_TO_POS) != 0 |
| 3999 | && BUFFERP (it->object) |
| 4000 | && IT_CHARPOS (*it) >= to_charpos)) |
| 4001 | { |
| 4002 | result = MOVE_POS_MATCH_OR_ZV; |
| 4003 | break; |
| 4004 | } |
| 4005 | |
| 4006 | /* The call to produce_glyphs will get the metrics of the |
| 4007 | display element IT is loaded with. We record in x the |
| 4008 | x-position before this display element in case it does not |
| 4009 | fit on the line. */ |
| 4010 | x = it->current_x; |
| 4011 | PRODUCE_GLYPHS (it); |
| 4012 | |
| 4013 | if (it->area != TEXT_AREA) |
| 4014 | { |
| 4015 | set_iterator_to_next (it); |
| 4016 | continue; |
| 4017 | } |
| 4018 | |
| 4019 | /* The number of glyphs we get back in IT->nglyphs will normally |
| 4020 | be 1 except when IT->c is (i) a TAB, or (ii) a multi-glyph |
| 4021 | character on a terminal frame, or (iii) a line end. For the |
| 4022 | second case, IT->nglyphs - 1 padding glyphs will be present |
| 4023 | (on X frames, there is only one glyph produced for a |
| 4024 | composite character. |
| 4025 | |
| 4026 | The behavior implemented below means, for continuation lines, |
| 4027 | that as many spaces of a TAB as fit on the current line are |
| 4028 | displayed there. For terminal frames, as many glyphs of a |
| 4029 | multi-glyph character are displayed in the current line, too. |
| 4030 | This is what the old redisplay code did, and we keep it that |
| 4031 | way. Under X, the whole shape of a complex character must |
| 4032 | fit on the line or it will be completely displayed in the |
| 4033 | next line. |
| 4034 | |
| 4035 | Note that both for tabs and padding glyphs, all glyphs have |
| 4036 | the same width. */ |
| 4037 | if (it->nglyphs) |
| 4038 | { |
| 4039 | /* More than one glyph or glyph doesn't fit on line. All |
| 4040 | glyphs have the same width. */ |
| 4041 | int single_glyph_width = it->pixel_width / it->nglyphs; |
| 4042 | int new_x; |
| 4043 | |
| 4044 | for (i = 0; i < it->nglyphs; ++i, x = new_x) |
| 4045 | { |
| 4046 | new_x = x + single_glyph_width; |
| 4047 | |
| 4048 | /* We want to leave anything reaching TO_X to the caller. */ |
| 4049 | if ((op & MOVE_TO_X) && new_x > to_x) |
| 4050 | { |
| 4051 | it->current_x = x; |
| 4052 | result = MOVE_X_REACHED; |
| 4053 | break; |
| 4054 | } |
| 4055 | else if (/* Lines are continued. */ |
| 4056 | !it->truncate_lines_p |
| 4057 | && (/* And glyph doesn't fit on the line. */ |
| 4058 | new_x > it->last_visible_x |
| 4059 | /* Or it fits exactly and we're on a window |
| 4060 | system frame. */ |
| 4061 | || (new_x == it->last_visible_x |
| 4062 | && FRAME_WINDOW_P (it->f)))) |
| 4063 | { |
| 4064 | if (/* IT->hpos == 0 means the very first glyph |
| 4065 | doesn't fit on the line, e.g. a wide image. */ |
| 4066 | it->hpos == 0 |
| 4067 | || (new_x == it->last_visible_x |
| 4068 | && FRAME_WINDOW_P (it->f))) |
| 4069 | { |
| 4070 | ++it->hpos; |
| 4071 | it->current_x = new_x; |
| 4072 | if (i == it->nglyphs - 1) |
| 4073 | set_iterator_to_next (it); |
| 4074 | } |
| 4075 | else |
| 4076 | it->current_x = x; |
| 4077 | |
| 4078 | result = MOVE_LINE_CONTINUED; |
| 4079 | break; |
| 4080 | } |
| 4081 | else if (new_x > it->first_visible_x) |
| 4082 | { |
| 4083 | /* Glyph is visible. Increment number of glyphs that |
| 4084 | would be displayed. */ |
| 4085 | ++it->hpos; |
| 4086 | } |
| 4087 | else |
| 4088 | { |
| 4089 | /* Glyph is completely off the left margin of the display |
| 4090 | area. Nothing to do. */ |
| 4091 | } |
| 4092 | } |
| 4093 | |
| 4094 | if (result != MOVE_UNDEFINED) |
| 4095 | break; |
| 4096 | } |
| 4097 | else if ((op & MOVE_TO_X) && it->current_x >= to_x) |
| 4098 | { |
| 4099 | /* Stop when TO_X specified and reached. This check is |
| 4100 | necessary here because of lines consisting of a line end, |
| 4101 | only. The line end will not produce any glyphs and we |
| 4102 | would never get MOVE_X_REACHED. */ |
| 4103 | xassert (it->nglyphs == 0); |
| 4104 | result = MOVE_X_REACHED; |
| 4105 | break; |
| 4106 | } |
| 4107 | |
| 4108 | /* Is this a line end? If yes, we're done. */ |
| 4109 | if (ITERATOR_AT_END_OF_LINE_P (it)) |
| 4110 | { |
| 4111 | result = MOVE_NEWLINE_OR_CR; |
| 4112 | break; |
| 4113 | } |
| 4114 | |
| 4115 | /* The current display element has been consumed. Advance |
| 4116 | to the next. */ |
| 4117 | set_iterator_to_next (it); |
| 4118 | |
| 4119 | /* Stop if lines are truncated and IT's current x-position is |
| 4120 | past the right edge of the window now. */ |
| 4121 | if (it->truncate_lines_p |
| 4122 | && it->current_x >= it->last_visible_x) |
| 4123 | { |
| 4124 | result = MOVE_LINE_TRUNCATED; |
| 4125 | break; |
| 4126 | } |
| 4127 | } |
| 4128 | |
| 4129 | /* Restore the iterator settings altered at the beginning of this |
| 4130 | function. */ |
| 4131 | it->glyph_row = saved_glyph_row; |
| 4132 | return result; |
| 4133 | } |
| 4134 | |
| 4135 | |
| 4136 | /* Move IT forward to a specified buffer position TO_CHARPOS, TO_X, |
| 4137 | TO_Y, TO_VPOS. OP is a bit-mask that specifies where to stop. See |
| 4138 | the description of enum move_operation_enum. |
| 4139 | |
| 4140 | If TO_CHARPOS is in invisible text, e.g. a truncated part of a |
| 4141 | screen line, this function will set IT to the next position > |
| 4142 | TO_CHARPOS. */ |
| 4143 | |
| 4144 | void |
| 4145 | move_it_to (it, to_charpos, to_x, to_y, to_vpos, op) |
| 4146 | struct it *it; |
| 4147 | int to_charpos, to_x, to_y, to_vpos; |
| 4148 | int op; |
| 4149 | { |
| 4150 | enum move_it_result skip, skip2 = MOVE_X_REACHED; |
| 4151 | int line_height; |
| 4152 | |
| 4153 | while (1) |
| 4154 | { |
| 4155 | if (op & MOVE_TO_VPOS) |
| 4156 | { |
| 4157 | /* If no TO_CHARPOS and no TO_X specified, stop at the |
| 4158 | start of the line TO_VPOS. */ |
| 4159 | if ((op & (MOVE_TO_X | MOVE_TO_POS)) == 0) |
| 4160 | { |
| 4161 | if (it->vpos == to_vpos) |
| 4162 | break; |
| 4163 | skip = move_it_in_display_line_to (it, -1, -1, 0); |
| 4164 | } |
| 4165 | else |
| 4166 | { |
| 4167 | /* TO_VPOS >= 0 means stop at TO_X in the line at |
| 4168 | TO_VPOS, or at TO_POS, whichever comes first. */ |
| 4169 | skip = move_it_in_display_line_to (it, to_charpos, to_x, op); |
| 4170 | |
| 4171 | if (skip == MOVE_POS_MATCH_OR_ZV || it->vpos == to_vpos) |
| 4172 | break; |
| 4173 | else if (skip == MOVE_X_REACHED && it->vpos != to_vpos) |
| 4174 | { |
| 4175 | /* We have reached TO_X but not in the line we want. */ |
| 4176 | skip = move_it_in_display_line_to (it, to_charpos, |
| 4177 | -1, MOVE_TO_POS); |
| 4178 | if (skip == MOVE_POS_MATCH_OR_ZV) |
| 4179 | break; |
| 4180 | } |
| 4181 | } |
| 4182 | } |
| 4183 | else if (op & MOVE_TO_Y) |
| 4184 | { |
| 4185 | struct it it_backup; |
| 4186 | int done_p; |
| 4187 | |
| 4188 | /* TO_Y specified means stop at TO_X in the line containing |
| 4189 | TO_Y---or at TO_CHARPOS if this is reached first. The |
| 4190 | problem is that we can't really tell whether the line |
| 4191 | contains TO_Y before we have completely scanned it, and |
| 4192 | this may skip past TO_X. What we do is to first scan to |
| 4193 | TO_X. |
| 4194 | |
| 4195 | If TO_X is not specified, use a TO_X of zero. The reason |
| 4196 | is to make the outcome of this function more predictable. |
| 4197 | If we didn't use TO_X == 0, we would stop at the end of |
| 4198 | the line which is probably not what a caller would expect |
| 4199 | to happen. */ |
| 4200 | skip = move_it_in_display_line_to (it, to_charpos, |
| 4201 | ((op & MOVE_TO_X) |
| 4202 | ? to_x : 0), |
| 4203 | (MOVE_TO_X |
| 4204 | | (op & MOVE_TO_POS))); |
| 4205 | |
| 4206 | /* If TO_CHARPOS is reached or ZV, we don't have to do more. */ |
| 4207 | if (skip == MOVE_POS_MATCH_OR_ZV) |
| 4208 | break; |
| 4209 | |
| 4210 | /* If TO_X was reached, we would like to know whether TO_Y |
| 4211 | is in the line. This can only be said if we know the |
| 4212 | total line height which requires us to scan the rest of |
| 4213 | the line. */ |
| 4214 | done_p = 0; |
| 4215 | if (skip == MOVE_X_REACHED) |
| 4216 | { |
| 4217 | it_backup = *it; |
| 4218 | skip2 = move_it_in_display_line_to (it, to_charpos, -1, |
| 4219 | op & MOVE_TO_POS); |
| 4220 | } |
| 4221 | |
| 4222 | /* Now, decide whether TO_Y is in this line. */ |
| 4223 | line_height = it->max_ascent + it->max_descent; |
| 4224 | |
| 4225 | if (to_y >= it->current_y |
| 4226 | && to_y < it->current_y + line_height) |
| 4227 | { |
| 4228 | if (skip == MOVE_X_REACHED) |
| 4229 | /* If TO_Y is in this line and TO_X was reached above, |
| 4230 | we scanned too far. We have to restore IT's settings |
| 4231 | to the ones before skipping. */ |
| 4232 | *it = it_backup; |
| 4233 | done_p = 1; |
| 4234 | } |
| 4235 | else if (skip == MOVE_X_REACHED) |
| 4236 | { |
| 4237 | skip = skip2; |
| 4238 | if (skip == MOVE_POS_MATCH_OR_ZV) |
| 4239 | done_p = 1; |
| 4240 | } |
| 4241 | |
| 4242 | if (done_p) |
| 4243 | break; |
| 4244 | } |
| 4245 | else |
| 4246 | skip = move_it_in_display_line_to (it, to_charpos, -1, MOVE_TO_POS); |
| 4247 | |
| 4248 | switch (skip) |
| 4249 | { |
| 4250 | case MOVE_POS_MATCH_OR_ZV: |
| 4251 | return; |
| 4252 | |
| 4253 | case MOVE_NEWLINE_OR_CR: |
| 4254 | set_iterator_to_next (it); |
| 4255 | it->continuation_lines_width = 0; |
| 4256 | break; |
| 4257 | |
| 4258 | case MOVE_LINE_TRUNCATED: |
| 4259 | it->continuation_lines_width = 0; |
| 4260 | reseat_at_next_visible_line_start (it, 0); |
| 4261 | if ((op & MOVE_TO_POS) != 0 |
| 4262 | && IT_CHARPOS (*it) > to_charpos) |
| 4263 | goto out; |
| 4264 | break; |
| 4265 | |
| 4266 | case MOVE_LINE_CONTINUED: |
| 4267 | it->continuation_lines_width += it->current_x; |
| 4268 | break; |
| 4269 | |
| 4270 | default: |
| 4271 | abort (); |
| 4272 | } |
| 4273 | |
| 4274 | /* Reset/increment for the next run. */ |
| 4275 | recenter_overlay_lists (current_buffer, IT_CHARPOS (*it)); |
| 4276 | it->current_x = it->hpos = 0; |
| 4277 | it->current_y += it->max_ascent + it->max_descent; |
| 4278 | ++it->vpos; |
| 4279 | last_height = it->max_ascent + it->max_descent; |
| 4280 | last_max_ascent = it->max_ascent; |
| 4281 | it->max_ascent = it->max_descent = 0; |
| 4282 | } |
| 4283 | out:; |
| 4284 | } |
| 4285 | |
| 4286 | |
| 4287 | /* Move iterator IT backward by a specified y-distance DY, DY >= 0. |
| 4288 | |
| 4289 | If DY > 0, move IT backward at least that many pixels. DY = 0 |
| 4290 | means move IT backward to the preceding line start or BEGV. This |
| 4291 | function may move over more than DY pixels if IT->current_y - DY |
| 4292 | ends up in the middle of a line; in this case IT->current_y will be |
| 4293 | set to the top of the line moved to. */ |
| 4294 | |
| 4295 | void |
| 4296 | move_it_vertically_backward (it, dy) |
| 4297 | struct it *it; |
| 4298 | int dy; |
| 4299 | { |
| 4300 | int nlines, h, line_height; |
| 4301 | struct it it2; |
| 4302 | int start_pos = IT_CHARPOS (*it); |
| 4303 | |
| 4304 | xassert (dy >= 0); |
| 4305 | |
| 4306 | /* Estimate how many newlines we must move back. */ |
| 4307 | nlines = max (1, dy / CANON_Y_UNIT (it->f)); |
| 4308 | |
| 4309 | /* Set the iterator's position that many lines back. */ |
| 4310 | while (nlines-- && IT_CHARPOS (*it) > BEGV) |
| 4311 | back_to_previous_visible_line_start (it); |
| 4312 | |
| 4313 | /* Reseat the iterator here. When moving backward, we don't want |
| 4314 | reseat to skip forward over invisible text, set up the iterator |
| 4315 | to deliver from overlay strings at the new position etc. So, |
| 4316 | use reseat_1 here. */ |
| 4317 | reseat_1 (it, it->current.pos, 1); |
| 4318 | |
| 4319 | /* We are now surely at a line start. */ |
| 4320 | it->current_x = it->hpos = 0; |
| 4321 | |
| 4322 | /* Move forward and see what y-distance we moved. First move to the |
| 4323 | start of the next line so that we get its height. We need this |
| 4324 | height to be able to tell whether we reached the specified |
| 4325 | y-distance. */ |
| 4326 | it2 = *it; |
| 4327 | it2.max_ascent = it2.max_descent = 0; |
| 4328 | move_it_to (&it2, start_pos, -1, -1, it2.vpos + 1, |
| 4329 | MOVE_TO_POS | MOVE_TO_VPOS); |
| 4330 | xassert (IT_CHARPOS (*it) >= BEGV); |
| 4331 | line_height = it2.max_ascent + it2.max_descent; |
| 4332 | move_it_to (&it2, start_pos, -1, -1, -1, MOVE_TO_POS); |
| 4333 | xassert (IT_CHARPOS (*it) >= BEGV); |
| 4334 | h = it2.current_y - it->current_y; |
| 4335 | nlines = it2.vpos - it->vpos; |
| 4336 | |
| 4337 | /* Correct IT's y and vpos position. */ |
| 4338 | it->vpos -= nlines; |
| 4339 | it->current_y -= h; |
| 4340 | |
| 4341 | if (dy == 0) |
| 4342 | { |
| 4343 | /* DY == 0 means move to the start of the screen line. The |
| 4344 | value of nlines is > 0 if continuation lines were involved. */ |
| 4345 | if (nlines > 0) |
| 4346 | move_it_by_lines (it, nlines, 1); |
| 4347 | xassert (IT_CHARPOS (*it) <= start_pos); |
| 4348 | } |
| 4349 | else if (nlines) |
| 4350 | { |
| 4351 | /* The y-position we try to reach. Note that h has been |
| 4352 | subtracted in front of the if-statement. */ |
| 4353 | int target_y = it->current_y + h - dy; |
| 4354 | |
| 4355 | /* If we did not reach target_y, try to move further backward if |
| 4356 | we can. If we moved too far backward, try to move forward. */ |
| 4357 | if (target_y < it->current_y |
| 4358 | && IT_CHARPOS (*it) > BEGV) |
| 4359 | { |
| 4360 | move_it_vertically (it, target_y - it->current_y); |
| 4361 | xassert (IT_CHARPOS (*it) >= BEGV); |
| 4362 | } |
| 4363 | else if (target_y >= it->current_y + line_height |
| 4364 | && IT_CHARPOS (*it) < ZV) |
| 4365 | { |
| 4366 | move_it_vertically (it, target_y - (it->current_y + line_height)); |
| 4367 | xassert (IT_CHARPOS (*it) >= BEGV); |
| 4368 | } |
| 4369 | } |
| 4370 | } |
| 4371 | |
| 4372 | |
| 4373 | /* Move IT by a specified amount of pixel lines DY. DY negative means |
| 4374 | move backwards. DY = 0 means move to start of screen line. At the |
| 4375 | end, IT will be on the start of a screen line. */ |
| 4376 | |
| 4377 | void |
| 4378 | move_it_vertically (it, dy) |
| 4379 | struct it *it; |
| 4380 | int dy; |
| 4381 | { |
| 4382 | if (dy <= 0) |
| 4383 | move_it_vertically_backward (it, -dy); |
| 4384 | else if (dy > 0) |
| 4385 | { |
| 4386 | move_it_to (it, ZV, -1, it->current_y + dy, -1, |
| 4387 | MOVE_TO_POS | MOVE_TO_Y); |
| 4388 | |
| 4389 | /* If buffer ends in ZV without a newline, move to the start of |
| 4390 | the line to satisfy the post-condition. */ |
| 4391 | if (IT_CHARPOS (*it) == ZV |
| 4392 | && FETCH_BYTE (IT_BYTEPOS (*it) - 1) != '\n') |
| 4393 | move_it_by_lines (it, 0, 0); |
| 4394 | } |
| 4395 | } |
| 4396 | |
| 4397 | |
| 4398 | /* Return non-zero if some text between buffer positions START_CHARPOS |
| 4399 | and END_CHARPOS is invisible. IT->window is the window for text |
| 4400 | property lookup. */ |
| 4401 | |
| 4402 | static int |
| 4403 | invisible_text_between_p (it, start_charpos, end_charpos) |
| 4404 | struct it *it; |
| 4405 | int start_charpos, end_charpos; |
| 4406 | { |
| 4407 | #ifdef USE_TEXT_PROPERTIES |
| 4408 | Lisp_Object prop, limit; |
| 4409 | int invisible_found_p; |
| 4410 | |
| 4411 | xassert (it != NULL && start_charpos <= end_charpos); |
| 4412 | |
| 4413 | /* Is text at START invisible? */ |
| 4414 | prop = Fget_char_property (make_number (start_charpos), Qinvisible, |
| 4415 | it->window); |
| 4416 | if (TEXT_PROP_MEANS_INVISIBLE (prop)) |
| 4417 | invisible_found_p = 1; |
| 4418 | else |
| 4419 | { |
| 4420 | limit = next_single_char_property_change (make_number (start_charpos), |
| 4421 | Qinvisible, Qnil, |
| 4422 | make_number (end_charpos)); |
| 4423 | invisible_found_p = XFASTINT (limit) < end_charpos; |
| 4424 | } |
| 4425 | |
| 4426 | return invisible_found_p; |
| 4427 | |
| 4428 | #else /* not USE_TEXT_PROPERTIES */ |
| 4429 | return 0; |
| 4430 | #endif /* not USE_TEXT_PROPERTIES */ |
| 4431 | } |
| 4432 | |
| 4433 | |
| 4434 | /* Move IT by a specified number DVPOS of screen lines down. DVPOS |
| 4435 | negative means move up. DVPOS == 0 means move to the start of the |
| 4436 | screen line. NEED_Y_P non-zero means calculate IT->current_y. If |
| 4437 | NEED_Y_P is zero, IT->current_y will be left unchanged. |
| 4438 | |
| 4439 | Further optimization ideas: If we would know that IT->f doesn't use |
| 4440 | a face with proportional font, we could be faster for |
| 4441 | truncate-lines nil. */ |
| 4442 | |
| 4443 | void |
| 4444 | move_it_by_lines (it, dvpos, need_y_p) |
| 4445 | struct it *it; |
| 4446 | int dvpos, need_y_p; |
| 4447 | { |
| 4448 | struct position pos; |
| 4449 | |
| 4450 | if (!FRAME_WINDOW_P (it->f)) |
| 4451 | { |
| 4452 | struct text_pos textpos; |
| 4453 | |
| 4454 | /* We can use vmotion on frames without proportional fonts. */ |
| 4455 | pos = *vmotion (IT_CHARPOS (*it), dvpos, it->w); |
| 4456 | SET_TEXT_POS (textpos, pos.bufpos, pos.bytepos); |
| 4457 | reseat (it, textpos, 1); |
| 4458 | it->vpos += pos.vpos; |
| 4459 | it->current_y += pos.vpos; |
| 4460 | } |
| 4461 | else if (dvpos == 0) |
| 4462 | { |
| 4463 | /* DVPOS == 0 means move to the start of the screen line. */ |
| 4464 | move_it_vertically_backward (it, 0); |
| 4465 | xassert (it->current_x == 0 && it->hpos == 0); |
| 4466 | } |
| 4467 | else if (dvpos > 0) |
| 4468 | { |
| 4469 | /* If there are no continuation lines, and if there is no |
| 4470 | selective display, try the simple method of moving forward |
| 4471 | DVPOS newlines, then see where we are. */ |
| 4472 | if (!need_y_p && it->truncate_lines_p && it->selective == 0) |
| 4473 | { |
| 4474 | int shortage = 0, charpos; |
| 4475 | |
| 4476 | if (FETCH_BYTE (IT_BYTEPOS (*it) == '\n')) |
| 4477 | charpos = IT_CHARPOS (*it) + 1; |
| 4478 | else |
| 4479 | charpos = scan_buffer ('\n', IT_CHARPOS (*it), 0, dvpos, |
| 4480 | &shortage, 0); |
| 4481 | |
| 4482 | if (!invisible_text_between_p (it, IT_CHARPOS (*it), charpos)) |
| 4483 | { |
| 4484 | struct text_pos pos; |
| 4485 | CHARPOS (pos) = charpos; |
| 4486 | BYTEPOS (pos) = CHAR_TO_BYTE (charpos); |
| 4487 | reseat (it, pos, 1); |
| 4488 | it->vpos += dvpos - shortage; |
| 4489 | it->hpos = it->current_x = 0; |
| 4490 | return; |
| 4491 | } |
| 4492 | } |
| 4493 | |
| 4494 | move_it_to (it, -1, -1, -1, it->vpos + dvpos, MOVE_TO_VPOS); |
| 4495 | } |
| 4496 | else |
| 4497 | { |
| 4498 | struct it it2; |
| 4499 | int start_charpos, i; |
| 4500 | |
| 4501 | /* If there are no continuation lines, and if there is no |
| 4502 | selective display, try the simple method of moving backward |
| 4503 | -DVPOS newlines. */ |
| 4504 | if (!need_y_p && it->truncate_lines_p && it->selective == 0) |
| 4505 | { |
| 4506 | int shortage; |
| 4507 | int charpos = IT_CHARPOS (*it); |
| 4508 | int bytepos = IT_BYTEPOS (*it); |
| 4509 | |
| 4510 | /* If in the middle of a line, go to its start. */ |
| 4511 | if (charpos > BEGV && FETCH_BYTE (bytepos - 1) != '\n') |
| 4512 | { |
| 4513 | charpos = find_next_newline_no_quit (charpos, -1); |
| 4514 | bytepos = CHAR_TO_BYTE (charpos); |
| 4515 | } |
| 4516 | |
| 4517 | if (charpos == BEGV) |
| 4518 | { |
| 4519 | struct text_pos pos; |
| 4520 | CHARPOS (pos) = charpos; |
| 4521 | BYTEPOS (pos) = bytepos; |
| 4522 | reseat (it, pos, 1); |
| 4523 | it->hpos = it->current_x = 0; |
| 4524 | return; |
| 4525 | } |
| 4526 | else |
| 4527 | { |
| 4528 | charpos = scan_buffer ('\n', charpos - 1, 0, dvpos, &shortage, 0); |
| 4529 | if (!invisible_text_between_p (it, charpos, IT_CHARPOS (*it))) |
| 4530 | { |
| 4531 | struct text_pos pos; |
| 4532 | CHARPOS (pos) = charpos; |
| 4533 | BYTEPOS (pos) = CHAR_TO_BYTE (charpos); |
| 4534 | reseat (it, pos, 1); |
| 4535 | it->vpos += dvpos + (shortage ? shortage - 1 : 0); |
| 4536 | it->hpos = it->current_x = 0; |
| 4537 | return; |
| 4538 | } |
| 4539 | } |
| 4540 | } |
| 4541 | |
| 4542 | /* Go back -DVPOS visible lines and reseat the iterator there. */ |
| 4543 | start_charpos = IT_CHARPOS (*it); |
| 4544 | for (i = -dvpos; i && IT_CHARPOS (*it) > BEGV; --i) |
| 4545 | back_to_previous_visible_line_start (it); |
| 4546 | reseat (it, it->current.pos, 1); |
| 4547 | it->current_x = it->hpos = 0; |
| 4548 | |
| 4549 | /* Above call may have moved too far if continuation lines |
| 4550 | are involved. Scan forward and see if it did. */ |
| 4551 | it2 = *it; |
| 4552 | it2.vpos = it2.current_y = 0; |
| 4553 | move_it_to (&it2, start_charpos, -1, -1, -1, MOVE_TO_POS); |
| 4554 | it->vpos -= it2.vpos; |
| 4555 | it->current_y -= it2.current_y; |
| 4556 | it->current_x = it->hpos = 0; |
| 4557 | |
| 4558 | /* If we moved too far, move IT some lines forward. */ |
| 4559 | if (it2.vpos > -dvpos) |
| 4560 | { |
| 4561 | int delta = it2.vpos + dvpos; |
| 4562 | move_it_to (it, -1, -1, -1, it->vpos + delta, MOVE_TO_VPOS); |
| 4563 | } |
| 4564 | } |
| 4565 | } |
| 4566 | |
| 4567 | |
| 4568 | \f |
| 4569 | /*********************************************************************** |
| 4570 | Messages |
| 4571 | ***********************************************************************/ |
| 4572 | |
| 4573 | |
| 4574 | /* Add a message with format string FORMAT and arguments ARG1 and ARG2 |
| 4575 | to *Messages*. */ |
| 4576 | |
| 4577 | void |
| 4578 | add_to_log (format, arg1, arg2) |
| 4579 | char *format; |
| 4580 | Lisp_Object arg1, arg2; |
| 4581 | { |
| 4582 | Lisp_Object args[3]; |
| 4583 | Lisp_Object msg, fmt; |
| 4584 | char *buffer; |
| 4585 | int len; |
| 4586 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 4587 | |
| 4588 | fmt = msg = Qnil; |
| 4589 | GCPRO4 (fmt, msg, arg1, arg2); |
| 4590 | |
| 4591 | args[0] = fmt = build_string (format); |
| 4592 | args[1] = arg1; |
| 4593 | args[2] = arg2; |
| 4594 | msg = Fformat (make_number (3), args); |
| 4595 | |
| 4596 | len = STRING_BYTES (XSTRING (msg)) + 1; |
| 4597 | buffer = (char *) alloca (len); |
| 4598 | strcpy (buffer, XSTRING (msg)->data); |
| 4599 | |
| 4600 | message_dolog (buffer, len, 1, 0); |
| 4601 | UNGCPRO; |
| 4602 | } |
| 4603 | |
| 4604 | |
| 4605 | /* Output a newline in the *Messages* buffer if "needs" one. */ |
| 4606 | |
| 4607 | void |
| 4608 | message_log_maybe_newline () |
| 4609 | { |
| 4610 | if (message_log_need_newline) |
| 4611 | message_dolog ("", 0, 1, 0); |
| 4612 | } |
| 4613 | |
| 4614 | |
| 4615 | /* Add a string M of length LEN to the message log, optionally |
| 4616 | terminated with a newline when NLFLAG is non-zero. MULTIBYTE, if |
| 4617 | nonzero, means interpret the contents of M as multibyte. This |
| 4618 | function calls low-level routines in order to bypass text property |
| 4619 | hooks, etc. which might not be safe to run. */ |
| 4620 | |
| 4621 | void |
| 4622 | message_dolog (m, len, nlflag, multibyte) |
| 4623 | char *m; |
| 4624 | int len, nlflag, multibyte; |
| 4625 | { |
| 4626 | if (!NILP (Vmessage_log_max)) |
| 4627 | { |
| 4628 | struct buffer *oldbuf; |
| 4629 | Lisp_Object oldpoint, oldbegv, oldzv; |
| 4630 | int old_windows_or_buffers_changed = windows_or_buffers_changed; |
| 4631 | int point_at_end = 0; |
| 4632 | int zv_at_end = 0; |
| 4633 | Lisp_Object old_deactivate_mark, tem; |
| 4634 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 4635 | |
| 4636 | old_deactivate_mark = Vdeactivate_mark; |
| 4637 | oldbuf = current_buffer; |
| 4638 | Fset_buffer (Fget_buffer_create (build_string ("*Messages*"))); |
| 4639 | current_buffer->undo_list = Qt; |
| 4640 | |
| 4641 | oldpoint = Fpoint_marker (); |
| 4642 | oldbegv = Fpoint_min_marker (); |
| 4643 | oldzv = Fpoint_max_marker (); |
| 4644 | GCPRO4 (oldpoint, oldbegv, oldzv, old_deactivate_mark); |
| 4645 | |
| 4646 | if (PT == Z) |
| 4647 | point_at_end = 1; |
| 4648 | if (ZV == Z) |
| 4649 | zv_at_end = 1; |
| 4650 | |
| 4651 | BEGV = BEG; |
| 4652 | BEGV_BYTE = BEG_BYTE; |
| 4653 | ZV = Z; |
| 4654 | ZV_BYTE = Z_BYTE; |
| 4655 | TEMP_SET_PT_BOTH (Z, Z_BYTE); |
| 4656 | |
| 4657 | /* Insert the string--maybe converting multibyte to single byte |
| 4658 | or vice versa, so that all the text fits the buffer. */ |
| 4659 | if (multibyte |
| 4660 | && NILP (current_buffer->enable_multibyte_characters)) |
| 4661 | { |
| 4662 | int i, c, nbytes; |
| 4663 | unsigned char work[1]; |
| 4664 | |
| 4665 | /* Convert a multibyte string to single-byte |
| 4666 | for the *Message* buffer. */ |
| 4667 | for (i = 0; i < len; i += nbytes) |
| 4668 | { |
| 4669 | c = string_char_and_length (m + i, len - i, &nbytes); |
| 4670 | work[0] = (SINGLE_BYTE_CHAR_P (c) |
| 4671 | ? c |
| 4672 | : multibyte_char_to_unibyte (c, Qnil)); |
| 4673 | insert_1_both (work, 1, 1, 1, 0, 0); |
| 4674 | } |
| 4675 | } |
| 4676 | else if (! multibyte |
| 4677 | && ! NILP (current_buffer->enable_multibyte_characters)) |
| 4678 | { |
| 4679 | int i, c, nbytes; |
| 4680 | unsigned char *msg = (unsigned char *) m; |
| 4681 | unsigned char *str, work[4]; |
| 4682 | /* Convert a single-byte string to multibyte |
| 4683 | for the *Message* buffer. */ |
| 4684 | for (i = 0; i < len; i++) |
| 4685 | { |
| 4686 | c = unibyte_char_to_multibyte (msg[i]); |
| 4687 | nbytes = CHAR_STRING (c, work, str); |
| 4688 | insert_1_both (work, 1, nbytes, 1, 0, 0); |
| 4689 | } |
| 4690 | } |
| 4691 | else if (len) |
| 4692 | insert_1 (m, len, 1, 0, 0); |
| 4693 | |
| 4694 | if (nlflag) |
| 4695 | { |
| 4696 | int this_bol, this_bol_byte, prev_bol, prev_bol_byte, dup; |
| 4697 | insert_1 ("\n", 1, 1, 0, 0); |
| 4698 | |
| 4699 | scan_newline (Z, Z_BYTE, BEG, BEG_BYTE, -2, 0); |
| 4700 | this_bol = PT; |
| 4701 | this_bol_byte = PT_BYTE; |
| 4702 | |
| 4703 | if (this_bol > BEG) |
| 4704 | { |
| 4705 | scan_newline (PT, PT_BYTE, BEG, BEG_BYTE, -2, 0); |
| 4706 | prev_bol = PT; |
| 4707 | prev_bol_byte = PT_BYTE; |
| 4708 | |
| 4709 | dup = message_log_check_duplicate (prev_bol, prev_bol_byte, |
| 4710 | this_bol, this_bol_byte); |
| 4711 | if (dup) |
| 4712 | { |
| 4713 | del_range_both (prev_bol, prev_bol_byte, |
| 4714 | this_bol, this_bol_byte, 0); |
| 4715 | if (dup > 1) |
| 4716 | { |
| 4717 | char dupstr[40]; |
| 4718 | int duplen; |
| 4719 | |
| 4720 | /* If you change this format, don't forget to also |
| 4721 | change message_log_check_duplicate. */ |
| 4722 | sprintf (dupstr, " [%d times]", dup); |
| 4723 | duplen = strlen (dupstr); |
| 4724 | TEMP_SET_PT_BOTH (Z - 1, Z_BYTE - 1); |
| 4725 | insert_1 (dupstr, duplen, 1, 0, 1); |
| 4726 | } |
| 4727 | } |
| 4728 | } |
| 4729 | |
| 4730 | if (NATNUMP (Vmessage_log_max)) |
| 4731 | { |
| 4732 | scan_newline (Z, Z_BYTE, BEG, BEG_BYTE, |
| 4733 | -XFASTINT (Vmessage_log_max) - 1, 0); |
| 4734 | del_range_both (BEG, BEG_BYTE, PT, PT_BYTE, 0); |
| 4735 | } |
| 4736 | } |
| 4737 | BEGV = XMARKER (oldbegv)->charpos; |
| 4738 | BEGV_BYTE = marker_byte_position (oldbegv); |
| 4739 | |
| 4740 | if (zv_at_end) |
| 4741 | { |
| 4742 | ZV = Z; |
| 4743 | ZV_BYTE = Z_BYTE; |
| 4744 | } |
| 4745 | else |
| 4746 | { |
| 4747 | ZV = XMARKER (oldzv)->charpos; |
| 4748 | ZV_BYTE = marker_byte_position (oldzv); |
| 4749 | } |
| 4750 | |
| 4751 | if (point_at_end) |
| 4752 | TEMP_SET_PT_BOTH (Z, Z_BYTE); |
| 4753 | else |
| 4754 | /* We can't do Fgoto_char (oldpoint) because it will run some |
| 4755 | Lisp code. */ |
| 4756 | TEMP_SET_PT_BOTH (XMARKER (oldpoint)->charpos, |
| 4757 | XMARKER (oldpoint)->bytepos); |
| 4758 | |
| 4759 | UNGCPRO; |
| 4760 | free_marker (oldpoint); |
| 4761 | free_marker (oldbegv); |
| 4762 | free_marker (oldzv); |
| 4763 | |
| 4764 | tem = Fget_buffer_window (Fcurrent_buffer (), Qt); |
| 4765 | set_buffer_internal (oldbuf); |
| 4766 | if (NILP (tem)) |
| 4767 | windows_or_buffers_changed = old_windows_or_buffers_changed; |
| 4768 | message_log_need_newline = !nlflag; |
| 4769 | Vdeactivate_mark = old_deactivate_mark; |
| 4770 | } |
| 4771 | } |
| 4772 | |
| 4773 | |
| 4774 | /* We are at the end of the buffer after just having inserted a newline. |
| 4775 | (Note: We depend on the fact we won't be crossing the gap.) |
| 4776 | Check to see if the most recent message looks a lot like the previous one. |
| 4777 | Return 0 if different, 1 if the new one should just replace it, or a |
| 4778 | value N > 1 if we should also append " [N times]". */ |
| 4779 | |
| 4780 | static int |
| 4781 | message_log_check_duplicate (prev_bol, prev_bol_byte, this_bol, this_bol_byte) |
| 4782 | int prev_bol, this_bol; |
| 4783 | int prev_bol_byte, this_bol_byte; |
| 4784 | { |
| 4785 | int i; |
| 4786 | int len = Z_BYTE - 1 - this_bol_byte; |
| 4787 | int seen_dots = 0; |
| 4788 | unsigned char *p1 = BUF_BYTE_ADDRESS (current_buffer, prev_bol_byte); |
| 4789 | unsigned char *p2 = BUF_BYTE_ADDRESS (current_buffer, this_bol_byte); |
| 4790 | |
| 4791 | for (i = 0; i < len; i++) |
| 4792 | { |
| 4793 | if (i >= 3 && p1[i-3] == '.' && p1[i-2] == '.' && p1[i-1] == '.' |
| 4794 | && p1[i] != '\n') |
| 4795 | seen_dots = 1; |
| 4796 | if (p1[i] != p2[i]) |
| 4797 | return seen_dots; |
| 4798 | } |
| 4799 | p1 += len; |
| 4800 | if (*p1 == '\n') |
| 4801 | return 2; |
| 4802 | if (*p1++ == ' ' && *p1++ == '[') |
| 4803 | { |
| 4804 | int n = 0; |
| 4805 | while (*p1 >= '0' && *p1 <= '9') |
| 4806 | n = n * 10 + *p1++ - '0'; |
| 4807 | if (strncmp (p1, " times]\n", 8) == 0) |
| 4808 | return n+1; |
| 4809 | } |
| 4810 | return 0; |
| 4811 | } |
| 4812 | |
| 4813 | |
| 4814 | /* Display an echo area message M with a specified length of LEN |
| 4815 | chars. The string may include null characters. If M is 0, clear |
| 4816 | out any existing message, and let the mini-buffer text show through. |
| 4817 | |
| 4818 | The buffer M must continue to exist until after the echo area gets |
| 4819 | cleared or some other message gets displayed there. This means do |
| 4820 | not pass text that is stored in a Lisp string; do not pass text in |
| 4821 | a buffer that was alloca'd. */ |
| 4822 | |
| 4823 | void |
| 4824 | message2 (m, len, multibyte) |
| 4825 | char *m; |
| 4826 | int len; |
| 4827 | int multibyte; |
| 4828 | { |
| 4829 | /* First flush out any partial line written with print. */ |
| 4830 | message_log_maybe_newline (); |
| 4831 | if (m) |
| 4832 | message_dolog (m, len, 1, multibyte); |
| 4833 | message2_nolog (m, len, multibyte); |
| 4834 | } |
| 4835 | |
| 4836 | |
| 4837 | /* The non-logging counterpart of message2. */ |
| 4838 | |
| 4839 | void |
| 4840 | message2_nolog (m, len, multibyte) |
| 4841 | char *m; |
| 4842 | int len; |
| 4843 | { |
| 4844 | struct frame *sf = SELECTED_FRAME (); |
| 4845 | message_enable_multibyte = multibyte; |
| 4846 | |
| 4847 | if (noninteractive) |
| 4848 | { |
| 4849 | if (noninteractive_need_newline) |
| 4850 | putc ('\n', stderr); |
| 4851 | noninteractive_need_newline = 0; |
| 4852 | if (m) |
| 4853 | fwrite (m, len, 1, stderr); |
| 4854 | if (cursor_in_echo_area == 0) |
| 4855 | fprintf (stderr, "\n"); |
| 4856 | fflush (stderr); |
| 4857 | } |
| 4858 | /* A null message buffer means that the frame hasn't really been |
| 4859 | initialized yet. Error messages get reported properly by |
| 4860 | cmd_error, so this must be just an informative message; toss it. */ |
| 4861 | else if (INTERACTIVE |
| 4862 | && sf->glyphs_initialized_p |
| 4863 | && FRAME_MESSAGE_BUF (sf)) |
| 4864 | { |
| 4865 | Lisp_Object mini_window; |
| 4866 | struct frame *f; |
| 4867 | |
| 4868 | /* Get the frame containing the mini-buffer |
| 4869 | that the selected frame is using. */ |
| 4870 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 4871 | f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window))); |
| 4872 | |
| 4873 | FRAME_SAMPLE_VISIBILITY (f); |
| 4874 | if (FRAME_VISIBLE_P (sf) |
| 4875 | && ! FRAME_VISIBLE_P (f)) |
| 4876 | Fmake_frame_visible (WINDOW_FRAME (XWINDOW (mini_window))); |
| 4877 | |
| 4878 | if (m) |
| 4879 | { |
| 4880 | set_message (m, Qnil, len, multibyte); |
| 4881 | if (minibuffer_auto_raise) |
| 4882 | Fraise_frame (WINDOW_FRAME (XWINDOW (mini_window))); |
| 4883 | } |
| 4884 | else |
| 4885 | clear_message (1, 1); |
| 4886 | |
| 4887 | do_pending_window_change (0); |
| 4888 | echo_area_display (1); |
| 4889 | do_pending_window_change (0); |
| 4890 | if (frame_up_to_date_hook != 0 && ! gc_in_progress) |
| 4891 | (*frame_up_to_date_hook) (f); |
| 4892 | } |
| 4893 | } |
| 4894 | |
| 4895 | |
| 4896 | /* Display an echo area message M with a specified length of NBYTES |
| 4897 | bytes. The string may include null characters. If M is not a |
| 4898 | string, clear out any existing message, and let the mini-buffer |
| 4899 | text show through. */ |
| 4900 | |
| 4901 | void |
| 4902 | message3 (m, nbytes, multibyte) |
| 4903 | Lisp_Object m; |
| 4904 | int nbytes; |
| 4905 | int multibyte; |
| 4906 | { |
| 4907 | struct gcpro gcpro1; |
| 4908 | |
| 4909 | GCPRO1 (m); |
| 4910 | |
| 4911 | /* First flush out any partial line written with print. */ |
| 4912 | message_log_maybe_newline (); |
| 4913 | if (STRINGP (m)) |
| 4914 | message_dolog (XSTRING (m)->data, nbytes, 1, multibyte); |
| 4915 | message3_nolog (m, nbytes, multibyte); |
| 4916 | |
| 4917 | UNGCPRO; |
| 4918 | } |
| 4919 | |
| 4920 | |
| 4921 | /* The non-logging version of message3. */ |
| 4922 | |
| 4923 | void |
| 4924 | message3_nolog (m, nbytes, multibyte) |
| 4925 | Lisp_Object m; |
| 4926 | int nbytes, multibyte; |
| 4927 | { |
| 4928 | struct frame *sf = SELECTED_FRAME (); |
| 4929 | message_enable_multibyte = multibyte; |
| 4930 | |
| 4931 | if (noninteractive) |
| 4932 | { |
| 4933 | if (noninteractive_need_newline) |
| 4934 | putc ('\n', stderr); |
| 4935 | noninteractive_need_newline = 0; |
| 4936 | if (STRINGP (m)) |
| 4937 | fwrite (XSTRING (m)->data, nbytes, 1, stderr); |
| 4938 | if (cursor_in_echo_area == 0) |
| 4939 | fprintf (stderr, "\n"); |
| 4940 | fflush (stderr); |
| 4941 | } |
| 4942 | /* A null message buffer means that the frame hasn't really been |
| 4943 | initialized yet. Error messages get reported properly by |
| 4944 | cmd_error, so this must be just an informative message; toss it. */ |
| 4945 | else if (INTERACTIVE |
| 4946 | && sf->glyphs_initialized_p |
| 4947 | && FRAME_MESSAGE_BUF (sf)) |
| 4948 | { |
| 4949 | Lisp_Object mini_window; |
| 4950 | Lisp_Object frame; |
| 4951 | struct frame *f; |
| 4952 | |
| 4953 | /* Get the frame containing the mini-buffer |
| 4954 | that the selected frame is using. */ |
| 4955 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 4956 | frame = XWINDOW (mini_window)->frame; |
| 4957 | f = XFRAME (frame); |
| 4958 | |
| 4959 | FRAME_SAMPLE_VISIBILITY (f); |
| 4960 | if (FRAME_VISIBLE_P (sf) |
| 4961 | && !FRAME_VISIBLE_P (f)) |
| 4962 | Fmake_frame_visible (frame); |
| 4963 | |
| 4964 | if (STRINGP (m) && XSTRING (m)->size) |
| 4965 | { |
| 4966 | set_message (NULL, m, nbytes, multibyte); |
| 4967 | if (minibuffer_auto_raise) |
| 4968 | Fraise_frame (frame); |
| 4969 | } |
| 4970 | else |
| 4971 | clear_message (1, 1); |
| 4972 | |
| 4973 | do_pending_window_change (0); |
| 4974 | echo_area_display (1); |
| 4975 | do_pending_window_change (0); |
| 4976 | if (frame_up_to_date_hook != 0 && ! gc_in_progress) |
| 4977 | (*frame_up_to_date_hook) (f); |
| 4978 | } |
| 4979 | } |
| 4980 | |
| 4981 | |
| 4982 | /* Display a null-terminated echo area message M. If M is 0, clear |
| 4983 | out any existing message, and let the mini-buffer text show through. |
| 4984 | |
| 4985 | The buffer M must continue to exist until after the echo area gets |
| 4986 | cleared or some other message gets displayed there. Do not pass |
| 4987 | text that is stored in a Lisp string. Do not pass text in a buffer |
| 4988 | that was alloca'd. */ |
| 4989 | |
| 4990 | void |
| 4991 | message1 (m) |
| 4992 | char *m; |
| 4993 | { |
| 4994 | message2 (m, (m ? strlen (m) : 0), 0); |
| 4995 | } |
| 4996 | |
| 4997 | |
| 4998 | /* The non-logging counterpart of message1. */ |
| 4999 | |
| 5000 | void |
| 5001 | message1_nolog (m) |
| 5002 | char *m; |
| 5003 | { |
| 5004 | message2_nolog (m, (m ? strlen (m) : 0), 0); |
| 5005 | } |
| 5006 | |
| 5007 | /* Display a message M which contains a single %s |
| 5008 | which gets replaced with STRING. */ |
| 5009 | |
| 5010 | void |
| 5011 | message_with_string (m, string, log) |
| 5012 | char *m; |
| 5013 | Lisp_Object string; |
| 5014 | int log; |
| 5015 | { |
| 5016 | if (noninteractive) |
| 5017 | { |
| 5018 | if (m) |
| 5019 | { |
| 5020 | if (noninteractive_need_newline) |
| 5021 | putc ('\n', stderr); |
| 5022 | noninteractive_need_newline = 0; |
| 5023 | fprintf (stderr, m, XSTRING (string)->data); |
| 5024 | if (cursor_in_echo_area == 0) |
| 5025 | fprintf (stderr, "\n"); |
| 5026 | fflush (stderr); |
| 5027 | } |
| 5028 | } |
| 5029 | else if (INTERACTIVE) |
| 5030 | { |
| 5031 | /* The frame whose minibuffer we're going to display the message on. |
| 5032 | It may be larger than the selected frame, so we need |
| 5033 | to use its buffer, not the selected frame's buffer. */ |
| 5034 | Lisp_Object mini_window; |
| 5035 | struct frame *f, *sf = SELECTED_FRAME (); |
| 5036 | |
| 5037 | /* Get the frame containing the minibuffer |
| 5038 | that the selected frame is using. */ |
| 5039 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 5040 | f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window))); |
| 5041 | |
| 5042 | /* A null message buffer means that the frame hasn't really been |
| 5043 | initialized yet. Error messages get reported properly by |
| 5044 | cmd_error, so this must be just an informative message; toss it. */ |
| 5045 | if (FRAME_MESSAGE_BUF (f)) |
| 5046 | { |
| 5047 | int len; |
| 5048 | char *a[1]; |
| 5049 | a[0] = (char *) XSTRING (string)->data; |
| 5050 | |
| 5051 | len = doprnt (FRAME_MESSAGE_BUF (f), |
| 5052 | FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a); |
| 5053 | |
| 5054 | if (log) |
| 5055 | message2 (FRAME_MESSAGE_BUF (f), len, |
| 5056 | STRING_MULTIBYTE (string)); |
| 5057 | else |
| 5058 | message2_nolog (FRAME_MESSAGE_BUF (f), len, |
| 5059 | STRING_MULTIBYTE (string)); |
| 5060 | |
| 5061 | /* Print should start at the beginning of the message |
| 5062 | buffer next time. */ |
| 5063 | message_buf_print = 0; |
| 5064 | } |
| 5065 | } |
| 5066 | } |
| 5067 | |
| 5068 | |
| 5069 | /* Dump an informative message to the minibuf. If M is 0, clear out |
| 5070 | any existing message, and let the mini-buffer text show through. */ |
| 5071 | |
| 5072 | /* VARARGS 1 */ |
| 5073 | void |
| 5074 | message (m, a1, a2, a3) |
| 5075 | char *m; |
| 5076 | EMACS_INT a1, a2, a3; |
| 5077 | { |
| 5078 | if (noninteractive) |
| 5079 | { |
| 5080 | if (m) |
| 5081 | { |
| 5082 | if (noninteractive_need_newline) |
| 5083 | putc ('\n', stderr); |
| 5084 | noninteractive_need_newline = 0; |
| 5085 | fprintf (stderr, m, a1, a2, a3); |
| 5086 | if (cursor_in_echo_area == 0) |
| 5087 | fprintf (stderr, "\n"); |
| 5088 | fflush (stderr); |
| 5089 | } |
| 5090 | } |
| 5091 | else if (INTERACTIVE) |
| 5092 | { |
| 5093 | /* The frame whose mini-buffer we're going to display the message |
| 5094 | on. It may be larger than the selected frame, so we need to |
| 5095 | use its buffer, not the selected frame's buffer. */ |
| 5096 | Lisp_Object mini_window; |
| 5097 | struct frame *f, *sf = SELECTED_FRAME (); |
| 5098 | |
| 5099 | /* Get the frame containing the mini-buffer |
| 5100 | that the selected frame is using. */ |
| 5101 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 5102 | f = XFRAME (WINDOW_FRAME (XWINDOW (mini_window))); |
| 5103 | |
| 5104 | /* A null message buffer means that the frame hasn't really been |
| 5105 | initialized yet. Error messages get reported properly by |
| 5106 | cmd_error, so this must be just an informative message; toss |
| 5107 | it. */ |
| 5108 | if (FRAME_MESSAGE_BUF (f)) |
| 5109 | { |
| 5110 | if (m) |
| 5111 | { |
| 5112 | int len; |
| 5113 | #ifdef NO_ARG_ARRAY |
| 5114 | char *a[3]; |
| 5115 | a[0] = (char *) a1; |
| 5116 | a[1] = (char *) a2; |
| 5117 | a[2] = (char *) a3; |
| 5118 | |
| 5119 | len = doprnt (FRAME_MESSAGE_BUF (f), |
| 5120 | FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a); |
| 5121 | #else |
| 5122 | len = doprnt (FRAME_MESSAGE_BUF (f), |
| 5123 | FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, |
| 5124 | (char **) &a1); |
| 5125 | #endif /* NO_ARG_ARRAY */ |
| 5126 | |
| 5127 | message2 (FRAME_MESSAGE_BUF (f), len, 0); |
| 5128 | } |
| 5129 | else |
| 5130 | message1 (0); |
| 5131 | |
| 5132 | /* Print should start at the beginning of the message |
| 5133 | buffer next time. */ |
| 5134 | message_buf_print = 0; |
| 5135 | } |
| 5136 | } |
| 5137 | } |
| 5138 | |
| 5139 | |
| 5140 | /* The non-logging version of message. */ |
| 5141 | |
| 5142 | void |
| 5143 | message_nolog (m, a1, a2, a3) |
| 5144 | char *m; |
| 5145 | EMACS_INT a1, a2, a3; |
| 5146 | { |
| 5147 | Lisp_Object old_log_max; |
| 5148 | old_log_max = Vmessage_log_max; |
| 5149 | Vmessage_log_max = Qnil; |
| 5150 | message (m, a1, a2, a3); |
| 5151 | Vmessage_log_max = old_log_max; |
| 5152 | } |
| 5153 | |
| 5154 | |
| 5155 | /* Display the current message in the current mini-buffer. This is |
| 5156 | only called from error handlers in process.c, and is not time |
| 5157 | critical. */ |
| 5158 | |
| 5159 | void |
| 5160 | update_echo_area () |
| 5161 | { |
| 5162 | if (!NILP (echo_area_buffer[0])) |
| 5163 | { |
| 5164 | Lisp_Object string; |
| 5165 | string = Fcurrent_message (); |
| 5166 | message3 (string, XSTRING (string)->size, |
| 5167 | !NILP (current_buffer->enable_multibyte_characters)); |
| 5168 | } |
| 5169 | } |
| 5170 | |
| 5171 | |
| 5172 | /* Call FN with args A1..A5 with either the current or last displayed |
| 5173 | echo_area_buffer as current buffer. |
| 5174 | |
| 5175 | WHICH zero means use the current message buffer |
| 5176 | echo_area_buffer[0]. If that is nil, choose a suitable buffer |
| 5177 | from echo_buffer[] and clear it. |
| 5178 | |
| 5179 | WHICH > 0 means use echo_area_buffer[1]. If that is nil, choose a |
| 5180 | suitable buffer from echo_buffer[] and clear it. |
| 5181 | |
| 5182 | If WHICH < 0, set echo_area_buffer[1] to echo_area_buffer[0], so |
| 5183 | that the current message becomes the last displayed one, make |
| 5184 | choose a suitable buffer for echo_area_buffer[0], and clear it. |
| 5185 | |
| 5186 | Value is what FN returns. */ |
| 5187 | |
| 5188 | static int |
| 5189 | with_echo_area_buffer (w, which, fn, a1, a2, a3, a4, a5) |
| 5190 | struct window *w; |
| 5191 | int which; |
| 5192 | int (*fn) (); |
| 5193 | int a1, a2, a3, a4, a5; |
| 5194 | { |
| 5195 | Lisp_Object buffer; |
| 5196 | int i, this_one, the_other, clear_buffer_p, rc; |
| 5197 | int count = specpdl_ptr - specpdl; |
| 5198 | |
| 5199 | /* If buffers aren't life, make new ones. */ |
| 5200 | for (i = 0; i < 2; ++i) |
| 5201 | if (!BUFFERP (echo_buffer[i]) |
| 5202 | || NILP (XBUFFER (echo_buffer[i])->name)) |
| 5203 | { |
| 5204 | char name[30]; |
| 5205 | sprintf (name, " *Echo Area %d*", i); |
| 5206 | echo_buffer[i] = Fget_buffer_create (build_string (name)); |
| 5207 | } |
| 5208 | |
| 5209 | clear_buffer_p = 0; |
| 5210 | |
| 5211 | if (which == 0) |
| 5212 | this_one = 0, the_other = 1; |
| 5213 | else if (which > 0) |
| 5214 | this_one = 1, the_other = 0; |
| 5215 | else |
| 5216 | { |
| 5217 | this_one = 0, the_other = 1; |
| 5218 | clear_buffer_p = 1; |
| 5219 | |
| 5220 | /* We need a fresh one in case the current echo buffer equals |
| 5221 | the one containing the last displayed echo area message. */ |
| 5222 | if (!NILP (echo_area_buffer[this_one]) |
| 5223 | && EQ (echo_area_buffer[this_one], echo_area_buffer[the_other])) |
| 5224 | echo_area_buffer[this_one] = Qnil; |
| 5225 | } |
| 5226 | |
| 5227 | /* Choose a suitable buffer from echo_buffer[] is we don't |
| 5228 | have one. */ |
| 5229 | if (NILP (echo_area_buffer[this_one])) |
| 5230 | { |
| 5231 | echo_area_buffer[this_one] |
| 5232 | = (EQ (echo_area_buffer[the_other], echo_buffer[this_one]) |
| 5233 | ? echo_buffer[the_other] |
| 5234 | : echo_buffer[this_one]); |
| 5235 | clear_buffer_p = 1; |
| 5236 | } |
| 5237 | |
| 5238 | buffer = echo_area_buffer[this_one]; |
| 5239 | |
| 5240 | record_unwind_protect (unwind_with_echo_area_buffer, |
| 5241 | with_echo_area_buffer_unwind_data (w)); |
| 5242 | |
| 5243 | /* Make the echo area buffer current. Note that for display |
| 5244 | purposes, it is not necessary that the displayed window's buffer |
| 5245 | == current_buffer, except for text property lookup. So, let's |
| 5246 | only set that buffer temporarily here without doing a full |
| 5247 | Fset_window_buffer. We must also change w->pointm, though, |
| 5248 | because otherwise an assertions in unshow_buffer fails, and Emacs |
| 5249 | aborts. */ |
| 5250 | set_buffer_internal_1 (XBUFFER (buffer)); |
| 5251 | if (w) |
| 5252 | { |
| 5253 | w->buffer = buffer; |
| 5254 | set_marker_both (w->pointm, buffer, BEG, BEG_BYTE); |
| 5255 | } |
| 5256 | current_buffer->truncate_lines = Qnil; |
| 5257 | current_buffer->undo_list = Qt; |
| 5258 | current_buffer->read_only = Qnil; |
| 5259 | |
| 5260 | if (clear_buffer_p && Z > BEG) |
| 5261 | del_range (BEG, Z); |
| 5262 | |
| 5263 | xassert (BEGV >= BEG); |
| 5264 | xassert (ZV <= Z && ZV >= BEGV); |
| 5265 | |
| 5266 | rc = fn (a1, a2, a3, a4, a5); |
| 5267 | |
| 5268 | xassert (BEGV >= BEG); |
| 5269 | xassert (ZV <= Z && ZV >= BEGV); |
| 5270 | |
| 5271 | unbind_to (count, Qnil); |
| 5272 | return rc; |
| 5273 | } |
| 5274 | |
| 5275 | |
| 5276 | /* Save state that should be preserved around the call to the function |
| 5277 | FN called in with_echo_area_buffer. */ |
| 5278 | |
| 5279 | static Lisp_Object |
| 5280 | with_echo_area_buffer_unwind_data (w) |
| 5281 | struct window *w; |
| 5282 | { |
| 5283 | int i = 0; |
| 5284 | Lisp_Object vector; |
| 5285 | |
| 5286 | /* Reduce consing by keeping one vector in |
| 5287 | Vwith_echo_area_save_vector. */ |
| 5288 | vector = Vwith_echo_area_save_vector; |
| 5289 | Vwith_echo_area_save_vector = Qnil; |
| 5290 | |
| 5291 | if (NILP (vector)) |
| 5292 | vector = Fmake_vector (make_number (7), Qnil); |
| 5293 | |
| 5294 | XSETBUFFER (XVECTOR (vector)->contents[i], current_buffer); ++i; |
| 5295 | XVECTOR (vector)->contents[i++] = Vdeactivate_mark; |
| 5296 | XVECTOR (vector)->contents[i++] = make_number (windows_or_buffers_changed); |
| 5297 | |
| 5298 | if (w) |
| 5299 | { |
| 5300 | XSETWINDOW (XVECTOR (vector)->contents[i], w); ++i; |
| 5301 | XVECTOR (vector)->contents[i++] = w->buffer; |
| 5302 | XVECTOR (vector)->contents[i++] |
| 5303 | = make_number (XMARKER (w->pointm)->charpos); |
| 5304 | XVECTOR (vector)->contents[i++] |
| 5305 | = make_number (XMARKER (w->pointm)->bytepos); |
| 5306 | } |
| 5307 | else |
| 5308 | { |
| 5309 | int end = i + 4; |
| 5310 | while (i < end) |
| 5311 | XVECTOR (vector)->contents[i++] = Qnil; |
| 5312 | } |
| 5313 | |
| 5314 | xassert (i == XVECTOR (vector)->size); |
| 5315 | return vector; |
| 5316 | } |
| 5317 | |
| 5318 | |
| 5319 | /* Restore global state from VECTOR which was created by |
| 5320 | with_echo_area_buffer_unwind_data. */ |
| 5321 | |
| 5322 | static Lisp_Object |
| 5323 | unwind_with_echo_area_buffer (vector) |
| 5324 | Lisp_Object vector; |
| 5325 | { |
| 5326 | int i = 0; |
| 5327 | |
| 5328 | set_buffer_internal_1 (XBUFFER (XVECTOR (vector)->contents[i])); ++i; |
| 5329 | Vdeactivate_mark = XVECTOR (vector)->contents[i]; ++i; |
| 5330 | windows_or_buffers_changed = XFASTINT (XVECTOR (vector)->contents[i]); ++i; |
| 5331 | |
| 5332 | if (WINDOWP (XVECTOR (vector)->contents[i])) |
| 5333 | { |
| 5334 | struct window *w; |
| 5335 | Lisp_Object buffer, charpos, bytepos; |
| 5336 | |
| 5337 | w = XWINDOW (XVECTOR (vector)->contents[i]); ++i; |
| 5338 | buffer = XVECTOR (vector)->contents[i]; ++i; |
| 5339 | charpos = XVECTOR (vector)->contents[i]; ++i; |
| 5340 | bytepos = XVECTOR (vector)->contents[i]; ++i; |
| 5341 | |
| 5342 | w->buffer = buffer; |
| 5343 | set_marker_both (w->pointm, buffer, |
| 5344 | XFASTINT (charpos), XFASTINT (bytepos)); |
| 5345 | } |
| 5346 | |
| 5347 | Vwith_echo_area_save_vector = vector; |
| 5348 | return Qnil; |
| 5349 | } |
| 5350 | |
| 5351 | |
| 5352 | /* Set up the echo area for use by print functions. MULTIBYTE_P |
| 5353 | non-zero means we will print multibyte. */ |
| 5354 | |
| 5355 | void |
| 5356 | setup_echo_area_for_printing (multibyte_p) |
| 5357 | int multibyte_p; |
| 5358 | { |
| 5359 | if (!message_buf_print) |
| 5360 | { |
| 5361 | /* A message has been output since the last time we printed. |
| 5362 | Choose a fresh echo area buffer. */ |
| 5363 | if (EQ (echo_area_buffer[1], echo_buffer[0])) |
| 5364 | echo_area_buffer[0] = echo_buffer[1]; |
| 5365 | else |
| 5366 | echo_area_buffer[0] = echo_buffer[0]; |
| 5367 | |
| 5368 | /* Switch to that buffer and clear it. */ |
| 5369 | set_buffer_internal (XBUFFER (echo_area_buffer[0])); |
| 5370 | if (Z > BEG) |
| 5371 | del_range (BEG, Z); |
| 5372 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 5373 | |
| 5374 | /* Set up the buffer for the multibyteness we need. */ |
| 5375 | if (multibyte_p |
| 5376 | != !NILP (current_buffer->enable_multibyte_characters)) |
| 5377 | Fset_buffer_multibyte (multibyte_p ? Qt : Qnil); |
| 5378 | |
| 5379 | /* Raise the frame containing the echo area. */ |
| 5380 | if (minibuffer_auto_raise) |
| 5381 | { |
| 5382 | struct frame *sf = SELECTED_FRAME (); |
| 5383 | Lisp_Object mini_window; |
| 5384 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 5385 | Fraise_frame (WINDOW_FRAME (XWINDOW (mini_window))); |
| 5386 | } |
| 5387 | |
| 5388 | message_buf_print = 1; |
| 5389 | } |
| 5390 | else if (current_buffer != XBUFFER (echo_area_buffer[0])) |
| 5391 | /* Someone switched buffers between print requests. */ |
| 5392 | set_buffer_internal (XBUFFER (echo_area_buffer[0])); |
| 5393 | } |
| 5394 | |
| 5395 | |
| 5396 | /* Display an echo area message in window W. Value is non-zero if W's |
| 5397 | height is changed. If display_last_displayed_message_p is |
| 5398 | non-zero, display the message that was last displayed, otherwise |
| 5399 | display the current message. */ |
| 5400 | |
| 5401 | static int |
| 5402 | display_echo_area (w) |
| 5403 | struct window *w; |
| 5404 | { |
| 5405 | int i, no_message_p, window_height_changed_p; |
| 5406 | |
| 5407 | /* If there is no message, we must call display_echo_area_1 |
| 5408 | nevertheless because it resizes the window. But we will have to |
| 5409 | reset the echo_area_buffer in question to nil at the end because |
| 5410 | with_echo_area_buffer will sets it to an empty buffer. */ |
| 5411 | i = display_last_displayed_message_p ? 1 : 0; |
| 5412 | no_message_p = NILP (echo_area_buffer[i]); |
| 5413 | |
| 5414 | window_height_changed_p |
| 5415 | = with_echo_area_buffer (w, display_last_displayed_message_p, |
| 5416 | (int (*) ()) display_echo_area_1, w); |
| 5417 | |
| 5418 | if (no_message_p) |
| 5419 | echo_area_buffer[i] = Qnil; |
| 5420 | |
| 5421 | return window_height_changed_p; |
| 5422 | } |
| 5423 | |
| 5424 | |
| 5425 | /* Helper for display_echo_area. Display the current buffer which |
| 5426 | contains the current echo area message in window W, a mini-window. |
| 5427 | Change the height of W so that all of the message is displayed. |
| 5428 | Value is non-zero if height of W was changed. */ |
| 5429 | |
| 5430 | static int |
| 5431 | display_echo_area_1 (w) |
| 5432 | struct window *w; |
| 5433 | { |
| 5434 | Lisp_Object window; |
| 5435 | struct text_pos start; |
| 5436 | int window_height_changed_p = 0; |
| 5437 | |
| 5438 | /* Do this before displaying, so that we have a large enough glyph |
| 5439 | matrix for the display. */ |
| 5440 | window_height_changed_p = resize_mini_window (w, 0); |
| 5441 | |
| 5442 | /* Display. */ |
| 5443 | clear_glyph_matrix (w->desired_matrix); |
| 5444 | XSETWINDOW (window, w); |
| 5445 | SET_TEXT_POS (start, BEG, BEG_BYTE); |
| 5446 | try_window (window, start); |
| 5447 | |
| 5448 | return window_height_changed_p; |
| 5449 | } |
| 5450 | |
| 5451 | |
| 5452 | /* Resize the echo area window to exactly the size needed for the |
| 5453 | currently displayed message, if there is one. */ |
| 5454 | |
| 5455 | void |
| 5456 | resize_echo_area_axactly () |
| 5457 | { |
| 5458 | if (BUFFERP (echo_area_buffer[0]) |
| 5459 | && WINDOWP (echo_area_window)) |
| 5460 | { |
| 5461 | struct window *w = XWINDOW (echo_area_window); |
| 5462 | int resized_p; |
| 5463 | |
| 5464 | resized_p = with_echo_area_buffer (w, 0, |
| 5465 | (int (*) ()) resize_mini_window, |
| 5466 | w, 1); |
| 5467 | if (resized_p) |
| 5468 | { |
| 5469 | ++windows_or_buffers_changed; |
| 5470 | ++update_mode_lines; |
| 5471 | redisplay_internal (0); |
| 5472 | } |
| 5473 | } |
| 5474 | } |
| 5475 | |
| 5476 | |
| 5477 | /* Resize mini-window W to fit the size of its contents. EXACT:P |
| 5478 | means size the window exactly to the size needed. Otherwise, it's |
| 5479 | only enlarged until W's buffer is empty. Value is non-zero if |
| 5480 | the window height has been changed. */ |
| 5481 | |
| 5482 | int |
| 5483 | resize_mini_window (w, exact_p) |
| 5484 | struct window *w; |
| 5485 | int exact_p; |
| 5486 | { |
| 5487 | struct frame *f = XFRAME (w->frame); |
| 5488 | int window_height_changed_p = 0; |
| 5489 | |
| 5490 | xassert (MINI_WINDOW_P (w)); |
| 5491 | |
| 5492 | /* Nil means don't try to resize. */ |
| 5493 | if (NILP (Vmax_mini_window_height) |
| 5494 | || (FRAME_X_P (f) && f->output_data.x == NULL)) |
| 5495 | return 0; |
| 5496 | |
| 5497 | if (!FRAME_MINIBUF_ONLY_P (f)) |
| 5498 | { |
| 5499 | struct it it; |
| 5500 | struct window *root = XWINDOW (FRAME_ROOT_WINDOW (f)); |
| 5501 | int total_height = XFASTINT (root->height) + XFASTINT (w->height); |
| 5502 | int height, max_height; |
| 5503 | int unit = CANON_Y_UNIT (f); |
| 5504 | struct text_pos start; |
| 5505 | |
| 5506 | init_iterator (&it, w, BEGV, BEGV_BYTE, NULL, DEFAULT_FACE_ID); |
| 5507 | |
| 5508 | /* Compute the max. number of lines specified by the user. */ |
| 5509 | if (FLOATP (Vmax_mini_window_height)) |
| 5510 | max_height = XFLOATINT (Vmax_mini_window_height) * total_height; |
| 5511 | else if (INTEGERP (Vmax_mini_window_height)) |
| 5512 | max_height = XINT (Vmax_mini_window_height); |
| 5513 | else |
| 5514 | max_height = total_height / 4; |
| 5515 | |
| 5516 | /* Correct that max. height if it's bogus. */ |
| 5517 | max_height = max (1, max_height); |
| 5518 | max_height = min (total_height, max_height); |
| 5519 | |
| 5520 | /* Find out the height of the text in the window. */ |
| 5521 | move_it_to (&it, ZV, -1, -1, -1, MOVE_TO_POS); |
| 5522 | height = (unit - 1 + it.current_y + last_height) / unit; |
| 5523 | height = max (1, height); |
| 5524 | |
| 5525 | /* Compute a suitable window start. */ |
| 5526 | if (height > max_height) |
| 5527 | { |
| 5528 | height = max_height; |
| 5529 | init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID); |
| 5530 | move_it_vertically_backward (&it, (height - 1) * unit); |
| 5531 | start = it.current.pos; |
| 5532 | } |
| 5533 | else |
| 5534 | SET_TEXT_POS (start, BEGV, BEGV_BYTE); |
| 5535 | SET_MARKER_FROM_TEXT_POS (w->start, start); |
| 5536 | |
| 5537 | /* Let it grow only, until we display an empty message, in which |
| 5538 | case the window shrinks again. */ |
| 5539 | if (height > XFASTINT (w->height)) |
| 5540 | { |
| 5541 | int old_height = XFASTINT (w->height); |
| 5542 | freeze_window_starts (f, 1); |
| 5543 | grow_mini_window (w, height - XFASTINT (w->height)); |
| 5544 | window_height_changed_p = XFASTINT (w->height) != old_height; |
| 5545 | } |
| 5546 | else if (height < XFASTINT (w->height) |
| 5547 | && (exact_p || BEGV == ZV)) |
| 5548 | { |
| 5549 | int old_height = XFASTINT (w->height); |
| 5550 | freeze_window_starts (f, 0); |
| 5551 | shrink_mini_window (w); |
| 5552 | window_height_changed_p = XFASTINT (w->height) != old_height; |
| 5553 | } |
| 5554 | } |
| 5555 | |
| 5556 | return window_height_changed_p; |
| 5557 | } |
| 5558 | |
| 5559 | |
| 5560 | /* Value is the current message, a string, or nil if there is no |
| 5561 | current message. */ |
| 5562 | |
| 5563 | Lisp_Object |
| 5564 | current_message () |
| 5565 | { |
| 5566 | Lisp_Object msg; |
| 5567 | |
| 5568 | if (NILP (echo_area_buffer[0])) |
| 5569 | msg = Qnil; |
| 5570 | else |
| 5571 | { |
| 5572 | with_echo_area_buffer (0, 0, (int (*) ()) current_message_1, &msg); |
| 5573 | if (NILP (msg)) |
| 5574 | echo_area_buffer[0] = Qnil; |
| 5575 | } |
| 5576 | |
| 5577 | return msg; |
| 5578 | } |
| 5579 | |
| 5580 | |
| 5581 | static int |
| 5582 | current_message_1 (msg) |
| 5583 | Lisp_Object *msg; |
| 5584 | { |
| 5585 | if (Z > BEG) |
| 5586 | *msg = make_buffer_string (BEG, Z, 1); |
| 5587 | else |
| 5588 | *msg = Qnil; |
| 5589 | return 0; |
| 5590 | } |
| 5591 | |
| 5592 | |
| 5593 | /* Push the current message on Vmessage_stack for later restauration |
| 5594 | by restore_message. Value is non-zero if the current message isn't |
| 5595 | empty. This is a relatively infrequent operation, so it's not |
| 5596 | worth optimizing. */ |
| 5597 | |
| 5598 | int |
| 5599 | push_message () |
| 5600 | { |
| 5601 | Lisp_Object msg; |
| 5602 | msg = current_message (); |
| 5603 | Vmessage_stack = Fcons (msg, Vmessage_stack); |
| 5604 | return STRINGP (msg); |
| 5605 | } |
| 5606 | |
| 5607 | |
| 5608 | /* Restore message display from the top of Vmessage_stack. */ |
| 5609 | |
| 5610 | void |
| 5611 | restore_message () |
| 5612 | { |
| 5613 | Lisp_Object msg; |
| 5614 | |
| 5615 | xassert (CONSP (Vmessage_stack)); |
| 5616 | msg = XCAR (Vmessage_stack); |
| 5617 | if (STRINGP (msg)) |
| 5618 | message3_nolog (msg, STRING_BYTES (XSTRING (msg)), STRING_MULTIBYTE (msg)); |
| 5619 | else |
| 5620 | message3_nolog (msg, 0, 0); |
| 5621 | } |
| 5622 | |
| 5623 | |
| 5624 | /* Pop the top-most entry off Vmessage_stack. */ |
| 5625 | |
| 5626 | void |
| 5627 | pop_message () |
| 5628 | { |
| 5629 | xassert (CONSP (Vmessage_stack)); |
| 5630 | Vmessage_stack = XCDR (Vmessage_stack); |
| 5631 | } |
| 5632 | |
| 5633 | |
| 5634 | /* Check that Vmessage_stack is nil. Called from emacs.c when Emacs |
| 5635 | exits. If the stack is not empty, we have a missing pop_message |
| 5636 | somewhere. */ |
| 5637 | |
| 5638 | void |
| 5639 | check_message_stack () |
| 5640 | { |
| 5641 | if (!NILP (Vmessage_stack)) |
| 5642 | abort (); |
| 5643 | } |
| 5644 | |
| 5645 | |
| 5646 | /* Truncate to NCHARS what will be displayed in the echo area the next |
| 5647 | time we display it---but don't redisplay it now. */ |
| 5648 | |
| 5649 | void |
| 5650 | truncate_echo_area (nchars) |
| 5651 | int nchars; |
| 5652 | { |
| 5653 | if (nchars == 0) |
| 5654 | echo_area_buffer[0] = Qnil; |
| 5655 | /* A null message buffer means that the frame hasn't really been |
| 5656 | initialized yet. Error messages get reported properly by |
| 5657 | cmd_error, so this must be just an informative message; toss it. */ |
| 5658 | else if (!noninteractive |
| 5659 | && INTERACTIVE |
| 5660 | && !NILP (echo_area_buffer[0])) |
| 5661 | { |
| 5662 | struct frame *sf = SELECTED_FRAME (); |
| 5663 | if (FRAME_MESSAGE_BUF (sf)) |
| 5664 | with_echo_area_buffer (0, 0, (int (*) ()) truncate_message_1, nchars); |
| 5665 | } |
| 5666 | } |
| 5667 | |
| 5668 | |
| 5669 | /* Helper function for truncate_echo_area. Truncate the current |
| 5670 | message to at most NCHARS characters. */ |
| 5671 | |
| 5672 | static int |
| 5673 | truncate_message_1 (nchars) |
| 5674 | int nchars; |
| 5675 | { |
| 5676 | if (BEG + nchars < Z) |
| 5677 | del_range (BEG + nchars, Z); |
| 5678 | if (Z == BEG) |
| 5679 | echo_area_buffer[0] = Qnil; |
| 5680 | return 0; |
| 5681 | } |
| 5682 | |
| 5683 | |
| 5684 | /* Set the current message to a substring of S or STRING. |
| 5685 | |
| 5686 | If STRING is a Lisp string, set the message to the first NBYTES |
| 5687 | bytes from STRING. NBYTES zero means use the whole string. If |
| 5688 | STRING is multibyte, the message will be displayed multibyte. |
| 5689 | |
| 5690 | If S is not null, set the message to the first LEN bytes of S. LEN |
| 5691 | zero means use the whole string. MULTIBYTE_P non-zero means S is |
| 5692 | multibyte. Display the message multibyte in that case. */ |
| 5693 | |
| 5694 | void |
| 5695 | set_message (s, string, nbytes, multibyte_p) |
| 5696 | char *s; |
| 5697 | Lisp_Object string; |
| 5698 | int nbytes; |
| 5699 | { |
| 5700 | message_enable_multibyte |
| 5701 | = ((s && multibyte_p) |
| 5702 | || (STRINGP (string) && STRING_MULTIBYTE (string))); |
| 5703 | |
| 5704 | with_echo_area_buffer (0, -1, (int (*) ()) set_message_1, |
| 5705 | s, string, nbytes, multibyte_p); |
| 5706 | message_buf_print = 0; |
| 5707 | } |
| 5708 | |
| 5709 | |
| 5710 | /* Helper function for set_message. Arguments have the same meaning |
| 5711 | as there. This function is called with the echo area buffer being |
| 5712 | current. */ |
| 5713 | |
| 5714 | static int |
| 5715 | set_message_1 (s, string, nbytes, multibyte_p) |
| 5716 | char *s; |
| 5717 | Lisp_Object string; |
| 5718 | int nbytes, multibyte_p; |
| 5719 | { |
| 5720 | xassert (BEG == Z); |
| 5721 | |
| 5722 | /* Change multibyteness of the echo buffer appropriately. */ |
| 5723 | if (message_enable_multibyte |
| 5724 | != !NILP (current_buffer->enable_multibyte_characters)) |
| 5725 | Fset_buffer_multibyte (message_enable_multibyte ? Qt : Qnil); |
| 5726 | |
| 5727 | /* Insert new message at BEG. */ |
| 5728 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 5729 | |
| 5730 | if (STRINGP (string)) |
| 5731 | { |
| 5732 | int nchars; |
| 5733 | |
| 5734 | if (nbytes == 0) |
| 5735 | nbytes = XSTRING (string)->size_byte; |
| 5736 | nchars = string_byte_to_char (string, nbytes); |
| 5737 | |
| 5738 | /* This function takes care of single/multibyte conversion. We |
| 5739 | just have to ensure that the echo area buffer has the right |
| 5740 | setting of enable_multibyte_characters. */ |
| 5741 | insert_from_string (string, 0, 0, nchars, nbytes, 1); |
| 5742 | } |
| 5743 | else if (s) |
| 5744 | { |
| 5745 | if (nbytes == 0) |
| 5746 | nbytes = strlen (s); |
| 5747 | |
| 5748 | if (multibyte_p && NILP (current_buffer->enable_multibyte_characters)) |
| 5749 | { |
| 5750 | /* Convert from multi-byte to single-byte. */ |
| 5751 | int i, c, n; |
| 5752 | unsigned char work[1]; |
| 5753 | |
| 5754 | /* Convert a multibyte string to single-byte. */ |
| 5755 | for (i = 0; i < nbytes; i += n) |
| 5756 | { |
| 5757 | c = string_char_and_length (s + i, nbytes - i, &n); |
| 5758 | work[0] = (SINGLE_BYTE_CHAR_P (c) |
| 5759 | ? c |
| 5760 | : multibyte_char_to_unibyte (c, Qnil)); |
| 5761 | insert_1_both (work, 1, 1, 1, 0, 0); |
| 5762 | } |
| 5763 | } |
| 5764 | else if (!multibyte_p |
| 5765 | && !NILP (current_buffer->enable_multibyte_characters)) |
| 5766 | { |
| 5767 | /* Convert from single-byte to multi-byte. */ |
| 5768 | int i, c, n; |
| 5769 | unsigned char *msg = (unsigned char *) s; |
| 5770 | unsigned char *str, work[4]; |
| 5771 | |
| 5772 | /* Convert a single-byte string to multibyte. */ |
| 5773 | for (i = 0; i < nbytes; i++) |
| 5774 | { |
| 5775 | c = unibyte_char_to_multibyte (msg[i]); |
| 5776 | n = CHAR_STRING (c, work, str); |
| 5777 | insert_1_both (work, 1, n, 1, 0, 0); |
| 5778 | } |
| 5779 | } |
| 5780 | else |
| 5781 | insert_1 (s, nbytes, 1, 0, 0); |
| 5782 | } |
| 5783 | |
| 5784 | return 0; |
| 5785 | } |
| 5786 | |
| 5787 | |
| 5788 | /* Clear messages. CURRENT_P non-zero means clear the current |
| 5789 | message. LAST_DISPLAYED_P non-zero means clear the message |
| 5790 | last displayed. */ |
| 5791 | |
| 5792 | void |
| 5793 | clear_message (current_p, last_displayed_p) |
| 5794 | int current_p, last_displayed_p; |
| 5795 | { |
| 5796 | if (current_p) |
| 5797 | echo_area_buffer[0] = Qnil; |
| 5798 | |
| 5799 | if (last_displayed_p) |
| 5800 | echo_area_buffer[1] = Qnil; |
| 5801 | |
| 5802 | message_buf_print = 0; |
| 5803 | } |
| 5804 | |
| 5805 | /* Clear garbaged frames. |
| 5806 | |
| 5807 | This function is used where the old redisplay called |
| 5808 | redraw_garbaged_frames which in turn called redraw_frame which in |
| 5809 | turn called clear_frame. The call to clear_frame was a source of |
| 5810 | flickering. I believe a clear_frame is not necessary. It should |
| 5811 | suffice in the new redisplay to invalidate all current matrices, |
| 5812 | and ensure a complete redisplay of all windows. */ |
| 5813 | |
| 5814 | static void |
| 5815 | clear_garbaged_frames () |
| 5816 | { |
| 5817 | if (frame_garbaged) |
| 5818 | { |
| 5819 | Lisp_Object tail, frame; |
| 5820 | |
| 5821 | FOR_EACH_FRAME (tail, frame) |
| 5822 | { |
| 5823 | struct frame *f = XFRAME (frame); |
| 5824 | |
| 5825 | if (FRAME_VISIBLE_P (f) && FRAME_GARBAGED_P (f)) |
| 5826 | { |
| 5827 | clear_current_matrices (f); |
| 5828 | f->garbaged = 0; |
| 5829 | } |
| 5830 | } |
| 5831 | |
| 5832 | frame_garbaged = 0; |
| 5833 | ++windows_or_buffers_changed; |
| 5834 | } |
| 5835 | } |
| 5836 | |
| 5837 | |
| 5838 | /* Redisplay the echo area of the selected frame. If UPDATE_FRAME_P |
| 5839 | is non-zero update selected_frame. Value is non-zero if the |
| 5840 | mini-windows height has been changed. */ |
| 5841 | |
| 5842 | static int |
| 5843 | echo_area_display (update_frame_p) |
| 5844 | int update_frame_p; |
| 5845 | { |
| 5846 | Lisp_Object mini_window; |
| 5847 | struct window *w; |
| 5848 | struct frame *f; |
| 5849 | int window_height_changed_p = 0; |
| 5850 | struct frame *sf = SELECTED_FRAME (); |
| 5851 | |
| 5852 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 5853 | w = XWINDOW (mini_window); |
| 5854 | f = XFRAME (WINDOW_FRAME (w)); |
| 5855 | |
| 5856 | /* Don't display if frame is invisible or not yet initialized. */ |
| 5857 | if (!FRAME_VISIBLE_P (f) || !f->glyphs_initialized_p) |
| 5858 | return 0; |
| 5859 | |
| 5860 | #if 0 /* inhibit_window_system is not a valid way of testing |
| 5861 | whether a window system is in use. |
| 5862 | This code prevents all echo area display |
| 5863 | when you run plain `emacs' on a tty. */ |
| 5864 | /* When Emacs starts, selected_frame may be a visible terminal |
| 5865 | frame, even if we run under a window system. If we let this |
| 5866 | through, a message would be displayed on the terminal. */ |
| 5867 | #ifdef HAVE_WINDOW_SYSTEM |
| 5868 | if (!inhibit_window_system && !FRAME_WINDOW_P (sf)) |
| 5869 | return 0; |
| 5870 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 5871 | #endif |
| 5872 | |
| 5873 | /* Redraw garbaged frames. */ |
| 5874 | if (frame_garbaged) |
| 5875 | clear_garbaged_frames (); |
| 5876 | |
| 5877 | if (!NILP (echo_area_buffer[0]) || minibuf_level == 0) |
| 5878 | { |
| 5879 | echo_area_window = mini_window; |
| 5880 | window_height_changed_p = display_echo_area (w); |
| 5881 | w->must_be_updated_p = 1; |
| 5882 | |
| 5883 | if (update_frame_p) |
| 5884 | { |
| 5885 | /* Not called from redisplay_internal. If we changed |
| 5886 | window configuration, we must redisplay thoroughly. |
| 5887 | Otherwise, we can do with updating what we displayed |
| 5888 | above. */ |
| 5889 | if (window_height_changed_p) |
| 5890 | { |
| 5891 | ++windows_or_buffers_changed; |
| 5892 | ++update_mode_lines; |
| 5893 | redisplay_internal (0); |
| 5894 | } |
| 5895 | else if (FRAME_WINDOW_P (f)) |
| 5896 | { |
| 5897 | update_single_window (w, 1); |
| 5898 | rif->flush_display (f); |
| 5899 | } |
| 5900 | else |
| 5901 | update_frame (f, 1, 1); |
| 5902 | } |
| 5903 | } |
| 5904 | else if (!EQ (mini_window, selected_window)) |
| 5905 | windows_or_buffers_changed++; |
| 5906 | |
| 5907 | /* Last displayed message is now the current message. */ |
| 5908 | echo_area_buffer[1] = echo_area_buffer[0]; |
| 5909 | |
| 5910 | /* Prevent redisplay optimization in redisplay_internal by resetting |
| 5911 | this_line_start_pos. This is done because the mini-buffer now |
| 5912 | displays the message instead of its buffer text. */ |
| 5913 | if (EQ (mini_window, selected_window)) |
| 5914 | CHARPOS (this_line_start_pos) = 0; |
| 5915 | |
| 5916 | return window_height_changed_p; |
| 5917 | } |
| 5918 | |
| 5919 | |
| 5920 | \f |
| 5921 | /*********************************************************************** |
| 5922 | Frame Titles |
| 5923 | ***********************************************************************/ |
| 5924 | |
| 5925 | |
| 5926 | #ifdef HAVE_WINDOW_SYSTEM |
| 5927 | |
| 5928 | /* A buffer for constructing frame titles in it; allocated from the |
| 5929 | heap in init_xdisp and resized as needed in store_frame_title_char. */ |
| 5930 | |
| 5931 | static char *frame_title_buf; |
| 5932 | |
| 5933 | /* The buffer's end, and a current output position in it. */ |
| 5934 | |
| 5935 | static char *frame_title_buf_end; |
| 5936 | static char *frame_title_ptr; |
| 5937 | |
| 5938 | |
| 5939 | /* Store a single character C for the frame title in frame_title_buf. |
| 5940 | Re-allocate frame_title_buf if necessary. */ |
| 5941 | |
| 5942 | static void |
| 5943 | store_frame_title_char (c) |
| 5944 | char c; |
| 5945 | { |
| 5946 | /* If output position has reached the end of the allocated buffer, |
| 5947 | double the buffer's size. */ |
| 5948 | if (frame_title_ptr == frame_title_buf_end) |
| 5949 | { |
| 5950 | int len = frame_title_ptr - frame_title_buf; |
| 5951 | int new_size = 2 * len * sizeof *frame_title_buf; |
| 5952 | frame_title_buf = (char *) xrealloc (frame_title_buf, new_size); |
| 5953 | frame_title_buf_end = frame_title_buf + new_size; |
| 5954 | frame_title_ptr = frame_title_buf + len; |
| 5955 | } |
| 5956 | |
| 5957 | *frame_title_ptr++ = c; |
| 5958 | } |
| 5959 | |
| 5960 | |
| 5961 | /* Store part of a frame title in frame_title_buf, beginning at |
| 5962 | frame_title_ptr. STR is the string to store. Do not copy more |
| 5963 | than PRECISION number of bytes from STR; PRECISION <= 0 means copy |
| 5964 | the whole string. Pad with spaces until FIELD_WIDTH number of |
| 5965 | characters have been copied; FIELD_WIDTH <= 0 means don't pad. |
| 5966 | Called from display_mode_element when it is used to build a frame |
| 5967 | title. */ |
| 5968 | |
| 5969 | static int |
| 5970 | store_frame_title (str, field_width, precision) |
| 5971 | unsigned char *str; |
| 5972 | int field_width, precision; |
| 5973 | { |
| 5974 | int n = 0; |
| 5975 | |
| 5976 | /* Copy at most PRECISION chars from STR. */ |
| 5977 | while ((precision <= 0 || n < precision) |
| 5978 | && *str) |
| 5979 | { |
| 5980 | store_frame_title_char (*str++); |
| 5981 | ++n; |
| 5982 | } |
| 5983 | |
| 5984 | /* Fill up with spaces until FIELD_WIDTH reached. */ |
| 5985 | while (field_width > 0 |
| 5986 | && n < field_width) |
| 5987 | { |
| 5988 | store_frame_title_char (' '); |
| 5989 | ++n; |
| 5990 | } |
| 5991 | |
| 5992 | return n; |
| 5993 | } |
| 5994 | |
| 5995 | |
| 5996 | /* Set the title of FRAME, if it has changed. The title format is |
| 5997 | Vicon_title_format if FRAME is iconified, otherwise it is |
| 5998 | frame_title_format. */ |
| 5999 | |
| 6000 | static void |
| 6001 | x_consider_frame_title (frame) |
| 6002 | Lisp_Object frame; |
| 6003 | { |
| 6004 | struct frame *f = XFRAME (frame); |
| 6005 | |
| 6006 | if (FRAME_WINDOW_P (f) |
| 6007 | || FRAME_MINIBUF_ONLY_P (f) |
| 6008 | || f->explicit_name) |
| 6009 | { |
| 6010 | /* Do we have more than one visible frame on this X display? */ |
| 6011 | Lisp_Object tail; |
| 6012 | Lisp_Object fmt; |
| 6013 | struct buffer *obuf; |
| 6014 | int len; |
| 6015 | struct it it; |
| 6016 | |
| 6017 | for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail)) |
| 6018 | { |
| 6019 | struct frame *tf = XFRAME (XCAR (tail)); |
| 6020 | |
| 6021 | if (tf != f |
| 6022 | && FRAME_KBOARD (tf) == FRAME_KBOARD (f) |
| 6023 | && !FRAME_MINIBUF_ONLY_P (tf) |
| 6024 | && (FRAME_VISIBLE_P (tf) || FRAME_ICONIFIED_P (tf))) |
| 6025 | break; |
| 6026 | } |
| 6027 | |
| 6028 | /* Set global variable indicating that multiple frames exist. */ |
| 6029 | multiple_frames = CONSP (tail); |
| 6030 | |
| 6031 | /* Switch to the buffer of selected window of the frame. Set up |
| 6032 | frame_title_ptr so that display_mode_element will output into it; |
| 6033 | then display the title. */ |
| 6034 | obuf = current_buffer; |
| 6035 | Fset_buffer (XWINDOW (f->selected_window)->buffer); |
| 6036 | fmt = FRAME_ICONIFIED_P (f) ? Vicon_title_format : Vframe_title_format; |
| 6037 | frame_title_ptr = frame_title_buf; |
| 6038 | init_iterator (&it, XWINDOW (f->selected_window), -1, -1, |
| 6039 | NULL, DEFAULT_FACE_ID); |
| 6040 | len = display_mode_element (&it, 0, -1, -1, fmt); |
| 6041 | frame_title_ptr = NULL; |
| 6042 | set_buffer_internal (obuf); |
| 6043 | |
| 6044 | /* Set the title only if it's changed. This avoids consing in |
| 6045 | the common case where it hasn't. (If it turns out that we've |
| 6046 | already wasted too much time by walking through the list with |
| 6047 | display_mode_element, then we might need to optimize at a |
| 6048 | higher level than this.) */ |
| 6049 | if (! STRINGP (f->name) |
| 6050 | || STRING_BYTES (XSTRING (f->name)) != len |
| 6051 | || bcmp (frame_title_buf, XSTRING (f->name)->data, len) != 0) |
| 6052 | x_implicitly_set_name (f, make_string (frame_title_buf, len), Qnil); |
| 6053 | } |
| 6054 | } |
| 6055 | |
| 6056 | #else /* not HAVE_WINDOW_SYSTEM */ |
| 6057 | |
| 6058 | #define frame_title_ptr ((char *)0) |
| 6059 | #define store_frame_title(str, mincol, maxcol) 0 |
| 6060 | |
| 6061 | #endif /* not HAVE_WINDOW_SYSTEM */ |
| 6062 | |
| 6063 | |
| 6064 | |
| 6065 | \f |
| 6066 | /*********************************************************************** |
| 6067 | Menu Bars |
| 6068 | ***********************************************************************/ |
| 6069 | |
| 6070 | |
| 6071 | /* Prepare for redisplay by updating menu-bar item lists when |
| 6072 | appropriate. This can call eval. */ |
| 6073 | |
| 6074 | void |
| 6075 | prepare_menu_bars () |
| 6076 | { |
| 6077 | int all_windows; |
| 6078 | struct gcpro gcpro1, gcpro2; |
| 6079 | struct frame *f; |
| 6080 | struct frame *tooltip_frame; |
| 6081 | |
| 6082 | #ifdef HAVE_X_WINDOWS |
| 6083 | tooltip_frame = tip_frame; |
| 6084 | #else |
| 6085 | tooltip_frame = NULL; |
| 6086 | #endif |
| 6087 | |
| 6088 | /* Update all frame titles based on their buffer names, etc. We do |
| 6089 | this before the menu bars so that the buffer-menu will show the |
| 6090 | up-to-date frame titles. */ |
| 6091 | #ifdef HAVE_WINDOW_SYSTEM |
| 6092 | if (windows_or_buffers_changed || update_mode_lines) |
| 6093 | { |
| 6094 | Lisp_Object tail, frame; |
| 6095 | |
| 6096 | FOR_EACH_FRAME (tail, frame) |
| 6097 | { |
| 6098 | f = XFRAME (frame); |
| 6099 | if (f != tooltip_frame |
| 6100 | && (FRAME_VISIBLE_P (f) || FRAME_ICONIFIED_P (f))) |
| 6101 | x_consider_frame_title (frame); |
| 6102 | } |
| 6103 | } |
| 6104 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 6105 | |
| 6106 | /* Update the menu bar item lists, if appropriate. This has to be |
| 6107 | done before any actual redisplay or generation of display lines. */ |
| 6108 | all_windows = (update_mode_lines |
| 6109 | || buffer_shared > 1 |
| 6110 | || windows_or_buffers_changed); |
| 6111 | if (all_windows) |
| 6112 | { |
| 6113 | Lisp_Object tail, frame; |
| 6114 | int count = specpdl_ptr - specpdl; |
| 6115 | |
| 6116 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); |
| 6117 | |
| 6118 | FOR_EACH_FRAME (tail, frame) |
| 6119 | { |
| 6120 | f = XFRAME (frame); |
| 6121 | |
| 6122 | /* Ignore tooltip frame. */ |
| 6123 | if (f == tooltip_frame) |
| 6124 | continue; |
| 6125 | |
| 6126 | /* If a window on this frame changed size, report that to |
| 6127 | the user and clear the size-change flag. */ |
| 6128 | if (FRAME_WINDOW_SIZES_CHANGED (f)) |
| 6129 | { |
| 6130 | Lisp_Object functions; |
| 6131 | |
| 6132 | /* Clear flag first in case we get an error below. */ |
| 6133 | FRAME_WINDOW_SIZES_CHANGED (f) = 0; |
| 6134 | functions = Vwindow_size_change_functions; |
| 6135 | GCPRO2 (tail, functions); |
| 6136 | |
| 6137 | while (CONSP (functions)) |
| 6138 | { |
| 6139 | call1 (XCAR (functions), frame); |
| 6140 | functions = XCDR (functions); |
| 6141 | } |
| 6142 | UNGCPRO; |
| 6143 | } |
| 6144 | |
| 6145 | GCPRO1 (tail); |
| 6146 | update_menu_bar (f, 0); |
| 6147 | #ifdef HAVE_WINDOW_SYSTEM |
| 6148 | update_tool_bar (f, 0); |
| 6149 | #endif |
| 6150 | UNGCPRO; |
| 6151 | } |
| 6152 | |
| 6153 | unbind_to (count, Qnil); |
| 6154 | } |
| 6155 | else |
| 6156 | { |
| 6157 | struct frame *sf = SELECTED_FRAME (); |
| 6158 | update_menu_bar (sf, 1); |
| 6159 | #ifdef HAVE_WINDOW_SYSTEM |
| 6160 | update_tool_bar (sf, 1); |
| 6161 | #endif |
| 6162 | } |
| 6163 | |
| 6164 | /* Motif needs this. See comment in xmenu.c. Turn it off when |
| 6165 | pending_menu_activation is not defined. */ |
| 6166 | #ifdef USE_X_TOOLKIT |
| 6167 | pending_menu_activation = 0; |
| 6168 | #endif |
| 6169 | } |
| 6170 | |
| 6171 | |
| 6172 | /* Update the menu bar item list for frame F. This has to be done |
| 6173 | before we start to fill in any display lines, because it can call |
| 6174 | eval. |
| 6175 | |
| 6176 | If SAVE_MATCH_DATA is non-zero, we must save and restore it here. */ |
| 6177 | |
| 6178 | static void |
| 6179 | update_menu_bar (f, save_match_data) |
| 6180 | struct frame *f; |
| 6181 | int save_match_data; |
| 6182 | { |
| 6183 | Lisp_Object window; |
| 6184 | register struct window *w; |
| 6185 | |
| 6186 | window = FRAME_SELECTED_WINDOW (f); |
| 6187 | w = XWINDOW (window); |
| 6188 | |
| 6189 | if (update_mode_lines) |
| 6190 | w->update_mode_line = Qt; |
| 6191 | |
| 6192 | if (FRAME_WINDOW_P (f) |
| 6193 | ? |
| 6194 | #if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) |
| 6195 | FRAME_EXTERNAL_MENU_BAR (f) |
| 6196 | #else |
| 6197 | FRAME_MENU_BAR_LINES (f) > 0 |
| 6198 | #endif |
| 6199 | : FRAME_MENU_BAR_LINES (f) > 0) |
| 6200 | { |
| 6201 | /* If the user has switched buffers or windows, we need to |
| 6202 | recompute to reflect the new bindings. But we'll |
| 6203 | recompute when update_mode_lines is set too; that means |
| 6204 | that people can use force-mode-line-update to request |
| 6205 | that the menu bar be recomputed. The adverse effect on |
| 6206 | the rest of the redisplay algorithm is about the same as |
| 6207 | windows_or_buffers_changed anyway. */ |
| 6208 | if (windows_or_buffers_changed |
| 6209 | || !NILP (w->update_mode_line) |
| 6210 | || ((BUF_SAVE_MODIFF (XBUFFER (w->buffer)) |
| 6211 | < BUF_MODIFF (XBUFFER (w->buffer))) |
| 6212 | != !NILP (w->last_had_star)) |
| 6213 | || ((!NILP (Vtransient_mark_mode) |
| 6214 | && !NILP (XBUFFER (w->buffer)->mark_active)) |
| 6215 | != !NILP (w->region_showing))) |
| 6216 | { |
| 6217 | struct buffer *prev = current_buffer; |
| 6218 | int count = specpdl_ptr - specpdl; |
| 6219 | |
| 6220 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 6221 | if (save_match_data) |
| 6222 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); |
| 6223 | if (NILP (Voverriding_local_map_menu_flag)) |
| 6224 | { |
| 6225 | specbind (Qoverriding_terminal_local_map, Qnil); |
| 6226 | specbind (Qoverriding_local_map, Qnil); |
| 6227 | } |
| 6228 | |
| 6229 | /* Run the Lucid hook. */ |
| 6230 | call1 (Vrun_hooks, Qactivate_menubar_hook); |
| 6231 | |
| 6232 | /* If it has changed current-menubar from previous value, |
| 6233 | really recompute the menu-bar from the value. */ |
| 6234 | if (! NILP (Vlucid_menu_bar_dirty_flag)) |
| 6235 | call0 (Qrecompute_lucid_menubar); |
| 6236 | |
| 6237 | safe_run_hooks (Qmenu_bar_update_hook); |
| 6238 | FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f)); |
| 6239 | |
| 6240 | /* Redisplay the menu bar in case we changed it. */ |
| 6241 | #if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) |
| 6242 | if (FRAME_WINDOW_P (f)) |
| 6243 | set_frame_menubar (f, 0, 0); |
| 6244 | else |
| 6245 | /* On a terminal screen, the menu bar is an ordinary screen |
| 6246 | line, and this makes it get updated. */ |
| 6247 | w->update_mode_line = Qt; |
| 6248 | #else /* ! (USE_X_TOOLKIT || HAVE_NTGUI) */ |
| 6249 | /* In the non-toolkit version, the menu bar is an ordinary screen |
| 6250 | line, and this makes it get updated. */ |
| 6251 | w->update_mode_line = Qt; |
| 6252 | #endif /* ! (USE_X_TOOLKIT || HAVE_NTGUI) */ |
| 6253 | |
| 6254 | unbind_to (count, Qnil); |
| 6255 | set_buffer_internal_1 (prev); |
| 6256 | } |
| 6257 | } |
| 6258 | } |
| 6259 | |
| 6260 | |
| 6261 | \f |
| 6262 | /*********************************************************************** |
| 6263 | Tool-bars |
| 6264 | ***********************************************************************/ |
| 6265 | |
| 6266 | #ifdef HAVE_WINDOW_SYSTEM |
| 6267 | |
| 6268 | /* Update the tool-bar item list for frame F. This has to be done |
| 6269 | before we start to fill in any display lines. Called from |
| 6270 | prepare_menu_bars. If SAVE_MATCH_DATA is non-zero, we must save |
| 6271 | and restore it here. */ |
| 6272 | |
| 6273 | static void |
| 6274 | update_tool_bar (f, save_match_data) |
| 6275 | struct frame *f; |
| 6276 | int save_match_data; |
| 6277 | { |
| 6278 | if (WINDOWP (f->tool_bar_window) |
| 6279 | && XFASTINT (XWINDOW (f->tool_bar_window)->height) > 0) |
| 6280 | { |
| 6281 | Lisp_Object window; |
| 6282 | struct window *w; |
| 6283 | |
| 6284 | window = FRAME_SELECTED_WINDOW (f); |
| 6285 | w = XWINDOW (window); |
| 6286 | |
| 6287 | /* If the user has switched buffers or windows, we need to |
| 6288 | recompute to reflect the new bindings. But we'll |
| 6289 | recompute when update_mode_lines is set too; that means |
| 6290 | that people can use force-mode-line-update to request |
| 6291 | that the menu bar be recomputed. The adverse effect on |
| 6292 | the rest of the redisplay algorithm is about the same as |
| 6293 | windows_or_buffers_changed anyway. */ |
| 6294 | if (windows_or_buffers_changed |
| 6295 | || !NILP (w->update_mode_line) |
| 6296 | || ((BUF_SAVE_MODIFF (XBUFFER (w->buffer)) |
| 6297 | < BUF_MODIFF (XBUFFER (w->buffer))) |
| 6298 | != !NILP (w->last_had_star)) |
| 6299 | || ((!NILP (Vtransient_mark_mode) |
| 6300 | && !NILP (XBUFFER (w->buffer)->mark_active)) |
| 6301 | != !NILP (w->region_showing))) |
| 6302 | { |
| 6303 | struct buffer *prev = current_buffer; |
| 6304 | int count = specpdl_ptr - specpdl; |
| 6305 | |
| 6306 | /* Set current_buffer to the buffer of the selected |
| 6307 | window of the frame, so that we get the right local |
| 6308 | keymaps. */ |
| 6309 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 6310 | |
| 6311 | /* Save match data, if we must. */ |
| 6312 | if (save_match_data) |
| 6313 | record_unwind_protect (Fset_match_data, Fmatch_data (Qnil, Qnil)); |
| 6314 | |
| 6315 | /* Make sure that we don't accidentally use bogus keymaps. */ |
| 6316 | if (NILP (Voverriding_local_map_menu_flag)) |
| 6317 | { |
| 6318 | specbind (Qoverriding_terminal_local_map, Qnil); |
| 6319 | specbind (Qoverriding_local_map, Qnil); |
| 6320 | } |
| 6321 | |
| 6322 | /* Build desired tool-bar items from keymaps. */ |
| 6323 | f->desired_tool_bar_items |
| 6324 | = tool_bar_items (f->desired_tool_bar_items, |
| 6325 | &f->n_desired_tool_bar_items); |
| 6326 | |
| 6327 | /* Redisplay the tool-bar in case we changed it. */ |
| 6328 | w->update_mode_line = Qt; |
| 6329 | |
| 6330 | unbind_to (count, Qnil); |
| 6331 | set_buffer_internal_1 (prev); |
| 6332 | } |
| 6333 | } |
| 6334 | } |
| 6335 | |
| 6336 | |
| 6337 | /* Set F->desired_tool_bar_string to a Lisp string representing frame |
| 6338 | F's desired tool-bar contents. F->desired_tool_bar_items must have |
| 6339 | been set up previously by calling prepare_menu_bars. */ |
| 6340 | |
| 6341 | static void |
| 6342 | build_desired_tool_bar_string (f) |
| 6343 | struct frame *f; |
| 6344 | { |
| 6345 | int i, size, size_needed, string_idx; |
| 6346 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 6347 | Lisp_Object image, plist, props; |
| 6348 | |
| 6349 | image = plist = props = Qnil; |
| 6350 | GCPRO3 (image, plist, props); |
| 6351 | |
| 6352 | /* Prepare F->desired_tool_bar_string. If we can reuse it, do so. |
| 6353 | Otherwise, make a new string. */ |
| 6354 | |
| 6355 | /* The size of the string we might be able to reuse. */ |
| 6356 | size = (STRINGP (f->desired_tool_bar_string) |
| 6357 | ? XSTRING (f->desired_tool_bar_string)->size |
| 6358 | : 0); |
| 6359 | |
| 6360 | /* Each image in the string we build is preceded by a space, |
| 6361 | and there is a space at the end. */ |
| 6362 | size_needed = f->n_desired_tool_bar_items + 1; |
| 6363 | |
| 6364 | /* Reuse f->desired_tool_bar_string, if possible. */ |
| 6365 | if (size < size_needed) |
| 6366 | f->desired_tool_bar_string = Fmake_string (make_number (size_needed), ' '); |
| 6367 | else |
| 6368 | { |
| 6369 | props = list4 (Qdisplay, Qnil, Qmenu_item, Qnil); |
| 6370 | Fremove_text_properties (make_number (0), make_number (size), |
| 6371 | props, f->desired_tool_bar_string); |
| 6372 | } |
| 6373 | |
| 6374 | /* Put a `display' property on the string for the images to display, |
| 6375 | put a `menu_item' property on tool-bar items with a value that |
| 6376 | is the index of the item in F's tool-bar item vector. */ |
| 6377 | for (i = 0, string_idx = 0; |
| 6378 | i < f->n_desired_tool_bar_items; |
| 6379 | ++i, string_idx += 1) |
| 6380 | { |
| 6381 | #define PROP(IDX) \ |
| 6382 | (XVECTOR (f->desired_tool_bar_items) \ |
| 6383 | ->contents[i * TOOL_BAR_ITEM_NSLOTS + (IDX)]) |
| 6384 | |
| 6385 | int enabled_p = !NILP (PROP (TOOL_BAR_ITEM_ENABLED_P)); |
| 6386 | int selected_p = !NILP (PROP (TOOL_BAR_ITEM_SELECTED_P)); |
| 6387 | int margin, relief; |
| 6388 | extern Lisp_Object QCrelief, QCmargin, QCalgorithm, Qimage; |
| 6389 | extern Lisp_Object Qlaplace; |
| 6390 | |
| 6391 | /* If image is a vector, choose the image according to the |
| 6392 | button state. */ |
| 6393 | image = PROP (TOOL_BAR_ITEM_IMAGES); |
| 6394 | if (VECTORP (image)) |
| 6395 | { |
| 6396 | enum tool_bar_item_image idx; |
| 6397 | |
| 6398 | if (enabled_p) |
| 6399 | idx = (selected_p |
| 6400 | ? TOOL_BAR_IMAGE_ENABLED_SELECTED |
| 6401 | : TOOL_BAR_IMAGE_ENABLED_DESELECTED); |
| 6402 | else |
| 6403 | idx = (selected_p |
| 6404 | ? TOOL_BAR_IMAGE_DISABLED_SELECTED |
| 6405 | : TOOL_BAR_IMAGE_DISABLED_DESELECTED); |
| 6406 | |
| 6407 | xassert (XVECTOR (image)->size >= idx); |
| 6408 | image = XVECTOR (image)->contents[idx]; |
| 6409 | } |
| 6410 | |
| 6411 | /* Ignore invalid image specifications. */ |
| 6412 | if (!valid_image_p (image)) |
| 6413 | continue; |
| 6414 | |
| 6415 | /* Display the tool-bar button pressed, or depressed. */ |
| 6416 | plist = Fcopy_sequence (XCDR (image)); |
| 6417 | |
| 6418 | /* Compute margin and relief to draw. */ |
| 6419 | relief = tool_bar_button_relief > 0 ? tool_bar_button_relief : 3; |
| 6420 | margin = relief + max (0, tool_bar_button_margin); |
| 6421 | |
| 6422 | if (auto_raise_tool_bar_buttons_p) |
| 6423 | { |
| 6424 | /* Add a `:relief' property to the image spec if the item is |
| 6425 | selected. */ |
| 6426 | if (selected_p) |
| 6427 | { |
| 6428 | plist = Fplist_put (plist, QCrelief, make_number (-relief)); |
| 6429 | margin -= relief; |
| 6430 | } |
| 6431 | } |
| 6432 | else |
| 6433 | { |
| 6434 | /* If image is selected, display it pressed, i.e. with a |
| 6435 | negative relief. If it's not selected, display it with a |
| 6436 | raised relief. */ |
| 6437 | plist = Fplist_put (plist, QCrelief, |
| 6438 | (selected_p |
| 6439 | ? make_number (-relief) |
| 6440 | : make_number (relief))); |
| 6441 | margin -= relief; |
| 6442 | } |
| 6443 | |
| 6444 | /* Put a margin around the image. */ |
| 6445 | if (margin) |
| 6446 | plist = Fplist_put (plist, QCmargin, make_number (margin)); |
| 6447 | |
| 6448 | /* If button is not enabled, make the image appear disabled by |
| 6449 | applying an appropriate algorithm to it. */ |
| 6450 | if (!enabled_p) |
| 6451 | plist = Fplist_put (plist, QCalgorithm, Qlaplace); |
| 6452 | |
| 6453 | /* Put a `display' text property on the string for the image to |
| 6454 | display. Put a `menu-item' property on the string that gives |
| 6455 | the start of this item's properties in the tool-bar items |
| 6456 | vector. */ |
| 6457 | image = Fcons (Qimage, plist); |
| 6458 | props = list4 (Qdisplay, image, |
| 6459 | Qmenu_item, make_number (i * TOOL_BAR_ITEM_NSLOTS)), |
| 6460 | Fadd_text_properties (make_number (string_idx), |
| 6461 | make_number (string_idx + 1), |
| 6462 | props, f->desired_tool_bar_string); |
| 6463 | #undef PROP |
| 6464 | } |
| 6465 | |
| 6466 | UNGCPRO; |
| 6467 | } |
| 6468 | |
| 6469 | |
| 6470 | /* Display one line of the tool-bar of frame IT->f. */ |
| 6471 | |
| 6472 | static void |
| 6473 | display_tool_bar_line (it) |
| 6474 | struct it *it; |
| 6475 | { |
| 6476 | struct glyph_row *row = it->glyph_row; |
| 6477 | int max_x = it->last_visible_x; |
| 6478 | struct glyph *last; |
| 6479 | |
| 6480 | prepare_desired_row (row); |
| 6481 | row->y = it->current_y; |
| 6482 | |
| 6483 | while (it->current_x < max_x) |
| 6484 | { |
| 6485 | int x_before, x, n_glyphs_before, i, nglyphs; |
| 6486 | |
| 6487 | /* Get the next display element. */ |
| 6488 | if (!get_next_display_element (it)) |
| 6489 | break; |
| 6490 | |
| 6491 | /* Produce glyphs. */ |
| 6492 | x_before = it->current_x; |
| 6493 | n_glyphs_before = it->glyph_row->used[TEXT_AREA]; |
| 6494 | PRODUCE_GLYPHS (it); |
| 6495 | |
| 6496 | nglyphs = it->glyph_row->used[TEXT_AREA] - n_glyphs_before; |
| 6497 | i = 0; |
| 6498 | x = x_before; |
| 6499 | while (i < nglyphs) |
| 6500 | { |
| 6501 | struct glyph *glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i; |
| 6502 | |
| 6503 | if (x + glyph->pixel_width > max_x) |
| 6504 | { |
| 6505 | /* Glyph doesn't fit on line. */ |
| 6506 | it->glyph_row->used[TEXT_AREA] = n_glyphs_before + i; |
| 6507 | it->current_x = x; |
| 6508 | goto out; |
| 6509 | } |
| 6510 | |
| 6511 | ++it->hpos; |
| 6512 | x += glyph->pixel_width; |
| 6513 | ++i; |
| 6514 | } |
| 6515 | |
| 6516 | /* Stop at line ends. */ |
| 6517 | if (ITERATOR_AT_END_OF_LINE_P (it)) |
| 6518 | break; |
| 6519 | |
| 6520 | set_iterator_to_next (it); |
| 6521 | } |
| 6522 | |
| 6523 | out:; |
| 6524 | |
| 6525 | row->displays_text_p = row->used[TEXT_AREA] != 0; |
| 6526 | extend_face_to_end_of_line (it); |
| 6527 | last = row->glyphs[TEXT_AREA] + row->used[TEXT_AREA] - 1; |
| 6528 | last->right_box_line_p = 1; |
| 6529 | compute_line_metrics (it); |
| 6530 | |
| 6531 | /* If line is empty, make it occupy the rest of the tool-bar. */ |
| 6532 | if (!row->displays_text_p) |
| 6533 | { |
| 6534 | row->height = row->phys_height = it->last_visible_y - row->y; |
| 6535 | row->ascent = row->phys_ascent = 0; |
| 6536 | } |
| 6537 | |
| 6538 | row->full_width_p = 1; |
| 6539 | row->continued_p = 0; |
| 6540 | row->truncated_on_left_p = 0; |
| 6541 | row->truncated_on_right_p = 0; |
| 6542 | |
| 6543 | it->current_x = it->hpos = 0; |
| 6544 | it->current_y += row->height; |
| 6545 | ++it->vpos; |
| 6546 | ++it->glyph_row; |
| 6547 | } |
| 6548 | |
| 6549 | |
| 6550 | /* Value is the number of screen lines needed to make all tool-bar |
| 6551 | items of frame F visible. */ |
| 6552 | |
| 6553 | static int |
| 6554 | tool_bar_lines_needed (f) |
| 6555 | struct frame *f; |
| 6556 | { |
| 6557 | struct window *w = XWINDOW (f->tool_bar_window); |
| 6558 | struct it it; |
| 6559 | |
| 6560 | /* Initialize an iterator for iteration over |
| 6561 | F->desired_tool_bar_string in the tool-bar window of frame F. */ |
| 6562 | init_iterator (&it, w, -1, -1, w->desired_matrix->rows, TOOL_BAR_FACE_ID); |
| 6563 | it.first_visible_x = 0; |
| 6564 | it.last_visible_x = FRAME_WINDOW_WIDTH (f) * CANON_X_UNIT (f); |
| 6565 | reseat_to_string (&it, NULL, f->desired_tool_bar_string, 0, 0, 0, -1); |
| 6566 | |
| 6567 | while (!ITERATOR_AT_END_P (&it)) |
| 6568 | { |
| 6569 | it.glyph_row = w->desired_matrix->rows; |
| 6570 | clear_glyph_row (it.glyph_row); |
| 6571 | display_tool_bar_line (&it); |
| 6572 | } |
| 6573 | |
| 6574 | return (it.current_y + CANON_Y_UNIT (f) - 1) / CANON_Y_UNIT (f); |
| 6575 | } |
| 6576 | |
| 6577 | |
| 6578 | /* Display the tool-bar of frame F. Value is non-zero if tool-bar's |
| 6579 | height should be changed. */ |
| 6580 | |
| 6581 | static int |
| 6582 | redisplay_tool_bar (f) |
| 6583 | struct frame *f; |
| 6584 | { |
| 6585 | struct window *w; |
| 6586 | struct it it; |
| 6587 | struct glyph_row *row; |
| 6588 | int change_height_p = 0; |
| 6589 | |
| 6590 | /* If frame hasn't a tool-bar window or if it is zero-height, don't |
| 6591 | do anything. This means you must start with tool-bar-lines |
| 6592 | non-zero to get the auto-sizing effect. Or in other words, you |
| 6593 | can turn off tool-bars by specifying tool-bar-lines zero. */ |
| 6594 | if (!WINDOWP (f->tool_bar_window) |
| 6595 | || (w = XWINDOW (f->tool_bar_window), |
| 6596 | XFASTINT (w->height) == 0)) |
| 6597 | return 0; |
| 6598 | |
| 6599 | /* Set up an iterator for the tool-bar window. */ |
| 6600 | init_iterator (&it, w, -1, -1, w->desired_matrix->rows, TOOL_BAR_FACE_ID); |
| 6601 | it.first_visible_x = 0; |
| 6602 | it.last_visible_x = FRAME_WINDOW_WIDTH (f) * CANON_X_UNIT (f); |
| 6603 | row = it.glyph_row; |
| 6604 | |
| 6605 | /* Build a string that represents the contents of the tool-bar. */ |
| 6606 | build_desired_tool_bar_string (f); |
| 6607 | reseat_to_string (&it, NULL, f->desired_tool_bar_string, 0, 0, 0, -1); |
| 6608 | |
| 6609 | /* Display as many lines as needed to display all tool-bar items. */ |
| 6610 | while (it.current_y < it.last_visible_y) |
| 6611 | display_tool_bar_line (&it); |
| 6612 | |
| 6613 | /* It doesn't make much sense to try scrolling in the tool-bar |
| 6614 | window, so don't do it. */ |
| 6615 | w->desired_matrix->no_scrolling_p = 1; |
| 6616 | w->must_be_updated_p = 1; |
| 6617 | |
| 6618 | if (auto_resize_tool_bars_p) |
| 6619 | { |
| 6620 | int nlines; |
| 6621 | |
| 6622 | /* If there are blank lines at the end, except for a partially |
| 6623 | visible blank line at the end that is smaller than |
| 6624 | CANON_Y_UNIT, change the tool-bar's height. */ |
| 6625 | row = it.glyph_row - 1; |
| 6626 | if (!row->displays_text_p |
| 6627 | && row->height >= CANON_Y_UNIT (f)) |
| 6628 | change_height_p = 1; |
| 6629 | |
| 6630 | /* If row displays tool-bar items, but is partially visible, |
| 6631 | change the tool-bar's height. */ |
| 6632 | if (row->displays_text_p |
| 6633 | && MATRIX_ROW_BOTTOM_Y (row) > it.last_visible_y) |
| 6634 | change_height_p = 1; |
| 6635 | |
| 6636 | /* Resize windows as needed by changing the `tool-bar-lines' |
| 6637 | frame parameter. */ |
| 6638 | if (change_height_p |
| 6639 | && (nlines = tool_bar_lines_needed (f), |
| 6640 | nlines != XFASTINT (w->height))) |
| 6641 | { |
| 6642 | extern Lisp_Object Qtool_bar_lines; |
| 6643 | Lisp_Object frame; |
| 6644 | |
| 6645 | XSETFRAME (frame, f); |
| 6646 | clear_glyph_matrix (w->desired_matrix); |
| 6647 | Fmodify_frame_parameters (frame, |
| 6648 | Fcons (Fcons (Qtool_bar_lines, |
| 6649 | make_number (nlines)), |
| 6650 | Qnil)); |
| 6651 | fonts_changed_p = 1; |
| 6652 | } |
| 6653 | } |
| 6654 | |
| 6655 | return change_height_p; |
| 6656 | } |
| 6657 | |
| 6658 | |
| 6659 | /* Get information about the tool-bar item which is displayed in GLYPH |
| 6660 | on frame F. Return in *PROP_IDX the index where tool-bar item |
| 6661 | properties start in F->current_tool_bar_items. Value is zero if |
| 6662 | GLYPH doesn't display a tool-bar item. */ |
| 6663 | |
| 6664 | int |
| 6665 | tool_bar_item_info (f, glyph, prop_idx) |
| 6666 | struct frame *f; |
| 6667 | struct glyph *glyph; |
| 6668 | int *prop_idx; |
| 6669 | { |
| 6670 | Lisp_Object prop; |
| 6671 | int success_p; |
| 6672 | |
| 6673 | /* Get the text property `menu-item' at pos. The value of that |
| 6674 | property is the start index of this item's properties in |
| 6675 | F->current_tool_bar_items. */ |
| 6676 | prop = Fget_text_property (make_number (glyph->charpos), |
| 6677 | Qmenu_item, f->current_tool_bar_string); |
| 6678 | if (INTEGERP (prop)) |
| 6679 | { |
| 6680 | *prop_idx = XINT (prop); |
| 6681 | success_p = 1; |
| 6682 | } |
| 6683 | else |
| 6684 | success_p = 0; |
| 6685 | |
| 6686 | return success_p; |
| 6687 | } |
| 6688 | |
| 6689 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 6690 | |
| 6691 | |
| 6692 | \f |
| 6693 | /************************************************************************ |
| 6694 | Horizontal scrolling |
| 6695 | ************************************************************************/ |
| 6696 | |
| 6697 | static int hscroll_window_tree P_ ((Lisp_Object)); |
| 6698 | static int hscroll_windows P_ ((Lisp_Object)); |
| 6699 | |
| 6700 | /* For all leaf windows in the window tree rooted at WINDOW, set their |
| 6701 | hscroll value so that PT is (i) visible in the window, and (ii) so |
| 6702 | that it is not within a certain margin at the window's left and |
| 6703 | right border. Value is non-zero if any window's hscroll has been |
| 6704 | changed. */ |
| 6705 | |
| 6706 | static int |
| 6707 | hscroll_window_tree (window) |
| 6708 | Lisp_Object window; |
| 6709 | { |
| 6710 | int hscrolled_p = 0; |
| 6711 | |
| 6712 | while (WINDOWP (window)) |
| 6713 | { |
| 6714 | struct window *w = XWINDOW (window); |
| 6715 | |
| 6716 | if (WINDOWP (w->hchild)) |
| 6717 | hscrolled_p |= hscroll_window_tree (w->hchild); |
| 6718 | else if (WINDOWP (w->vchild)) |
| 6719 | hscrolled_p |= hscroll_window_tree (w->vchild); |
| 6720 | else if (w->cursor.vpos >= 0) |
| 6721 | { |
| 6722 | int hscroll_margin, text_area_x, text_area_y; |
| 6723 | int text_area_width, text_area_height; |
| 6724 | struct glyph_row *current_cursor_row |
| 6725 | = MATRIX_ROW (w->current_matrix, w->cursor.vpos); |
| 6726 | struct glyph_row *desired_cursor_row |
| 6727 | = MATRIX_ROW (w->desired_matrix, w->cursor.vpos); |
| 6728 | struct glyph_row *cursor_row |
| 6729 | = (desired_cursor_row->enabled_p |
| 6730 | ? desired_cursor_row |
| 6731 | : current_cursor_row); |
| 6732 | |
| 6733 | window_box (w, TEXT_AREA, &text_area_x, &text_area_y, |
| 6734 | &text_area_width, &text_area_height); |
| 6735 | |
| 6736 | /* Scroll when cursor is inside this scroll margin. */ |
| 6737 | hscroll_margin = 5 * CANON_X_UNIT (XFRAME (w->frame)); |
| 6738 | |
| 6739 | if ((XFASTINT (w->hscroll) |
| 6740 | && w->cursor.x < hscroll_margin) |
| 6741 | || (cursor_row->enabled_p |
| 6742 | && cursor_row->truncated_on_right_p |
| 6743 | && (w->cursor.x > text_area_width - hscroll_margin))) |
| 6744 | { |
| 6745 | struct it it; |
| 6746 | int hscroll; |
| 6747 | struct buffer *saved_current_buffer; |
| 6748 | int pt; |
| 6749 | |
| 6750 | /* Find point in a display of infinite width. */ |
| 6751 | saved_current_buffer = current_buffer; |
| 6752 | current_buffer = XBUFFER (w->buffer); |
| 6753 | |
| 6754 | if (w == XWINDOW (selected_window)) |
| 6755 | pt = BUF_PT (current_buffer); |
| 6756 | else |
| 6757 | { |
| 6758 | pt = marker_position (w->pointm); |
| 6759 | pt = max (BEGV, pt); |
| 6760 | pt = min (ZV, pt); |
| 6761 | } |
| 6762 | |
| 6763 | /* Move iterator to pt starting at cursor_row->start in |
| 6764 | a line with infinite width. */ |
| 6765 | init_to_row_start (&it, w, cursor_row); |
| 6766 | it.last_visible_x = INFINITY; |
| 6767 | move_it_in_display_line_to (&it, pt, -1, MOVE_TO_POS); |
| 6768 | current_buffer = saved_current_buffer; |
| 6769 | |
| 6770 | /* Center cursor in window. */ |
| 6771 | hscroll = (max (0, it.current_x - text_area_width / 2) |
| 6772 | / CANON_X_UNIT (it.f)); |
| 6773 | |
| 6774 | /* Don't call Fset_window_hscroll if value hasn't |
| 6775 | changed because it will prevent redisplay |
| 6776 | optimizations. */ |
| 6777 | if (XFASTINT (w->hscroll) != hscroll) |
| 6778 | { |
| 6779 | Fset_window_hscroll (window, make_number (hscroll)); |
| 6780 | hscrolled_p = 1; |
| 6781 | } |
| 6782 | } |
| 6783 | } |
| 6784 | |
| 6785 | window = w->next; |
| 6786 | } |
| 6787 | |
| 6788 | /* Value is non-zero if hscroll of any leaf window has been changed. */ |
| 6789 | return hscrolled_p; |
| 6790 | } |
| 6791 | |
| 6792 | |
| 6793 | /* Set hscroll so that cursor is visible and not inside horizontal |
| 6794 | scroll margins for all windows in the tree rooted at WINDOW. See |
| 6795 | also hscroll_window_tree above. Value is non-zero if any window's |
| 6796 | hscroll has been changed. If it has, desired matrices on the frame |
| 6797 | of WINDOW are cleared. */ |
| 6798 | |
| 6799 | static int |
| 6800 | hscroll_windows (window) |
| 6801 | Lisp_Object window; |
| 6802 | { |
| 6803 | int hscrolled_p = hscroll_window_tree (window); |
| 6804 | if (hscrolled_p) |
| 6805 | clear_desired_matrices (XFRAME (WINDOW_FRAME (XWINDOW (window)))); |
| 6806 | return hscrolled_p; |
| 6807 | } |
| 6808 | |
| 6809 | |
| 6810 | \f |
| 6811 | /************************************************************************ |
| 6812 | Redisplay |
| 6813 | ************************************************************************/ |
| 6814 | |
| 6815 | /* Variables holding some state of redisplay if GLYPH_DEBUG is defined |
| 6816 | to a non-zero value. This is sometimes handy to have in a debugger |
| 6817 | session. */ |
| 6818 | |
| 6819 | #if GLYPH_DEBUG |
| 6820 | |
| 6821 | /* First and last unchanged row for try_window_id. */ |
| 6822 | |
| 6823 | int debug_first_unchanged_at_end_vpos; |
| 6824 | int debug_last_unchanged_at_beg_vpos; |
| 6825 | |
| 6826 | /* Delta vpos and y. */ |
| 6827 | |
| 6828 | int debug_dvpos, debug_dy; |
| 6829 | |
| 6830 | /* Delta in characters and bytes for try_window_id. */ |
| 6831 | |
| 6832 | int debug_delta, debug_delta_bytes; |
| 6833 | |
| 6834 | /* Values of window_end_pos and window_end_vpos at the end of |
| 6835 | try_window_id. */ |
| 6836 | |
| 6837 | int debug_end_pos, debug_end_vpos; |
| 6838 | |
| 6839 | /* Append a string to W->desired_matrix->method. FMT is a printf |
| 6840 | format string. A1...A9 are a supplement for a variable-length |
| 6841 | argument list. If trace_redisplay_p is non-zero also printf the |
| 6842 | resulting string to stderr. */ |
| 6843 | |
| 6844 | static void |
| 6845 | debug_method_add (w, fmt, a1, a2, a3, a4, a5, a6, a7, a8, a9) |
| 6846 | struct window *w; |
| 6847 | char *fmt; |
| 6848 | int a1, a2, a3, a4, a5, a6, a7, a8, a9; |
| 6849 | { |
| 6850 | char buffer[512]; |
| 6851 | char *method = w->desired_matrix->method; |
| 6852 | int len = strlen (method); |
| 6853 | int size = sizeof w->desired_matrix->method; |
| 6854 | int remaining = size - len - 1; |
| 6855 | |
| 6856 | sprintf (buffer, fmt, a1, a2, a3, a4, a5, a6, a7, a8, a9); |
| 6857 | if (len && remaining) |
| 6858 | { |
| 6859 | method[len] = '|'; |
| 6860 | --remaining, ++len; |
| 6861 | } |
| 6862 | |
| 6863 | strncpy (method + len, buffer, remaining); |
| 6864 | |
| 6865 | if (trace_redisplay_p) |
| 6866 | fprintf (stderr, "%p (%s): %s\n", |
| 6867 | w, |
| 6868 | ((BUFFERP (w->buffer) |
| 6869 | && STRINGP (XBUFFER (w->buffer)->name)) |
| 6870 | ? (char *) XSTRING (XBUFFER (w->buffer)->name)->data |
| 6871 | : "no buffer"), |
| 6872 | buffer); |
| 6873 | } |
| 6874 | |
| 6875 | #endif /* GLYPH_DEBUG */ |
| 6876 | |
| 6877 | |
| 6878 | /* This counter is used to clear the face cache every once in a while |
| 6879 | in redisplay_internal. It is incremented for each redisplay. |
| 6880 | Every CLEAR_FACE_CACHE_COUNT full redisplays, the face cache is |
| 6881 | cleared. */ |
| 6882 | |
| 6883 | #define CLEAR_FACE_CACHE_COUNT 10000 |
| 6884 | static int clear_face_cache_count; |
| 6885 | |
| 6886 | /* Record the previous terminal frame we displayed. */ |
| 6887 | |
| 6888 | static struct frame *previous_terminal_frame; |
| 6889 | |
| 6890 | /* Non-zero while redisplay_internal is in progress. */ |
| 6891 | |
| 6892 | int redisplaying_p; |
| 6893 | |
| 6894 | |
| 6895 | /* Value is non-zero if all changes in window W, which displays |
| 6896 | current_buffer, are in the text between START and END. START is a |
| 6897 | buffer position, END is given as a distance from Z. Used in |
| 6898 | redisplay_internal for display optimization. */ |
| 6899 | |
| 6900 | static INLINE int |
| 6901 | text_outside_line_unchanged_p (w, start, end) |
| 6902 | struct window *w; |
| 6903 | int start, end; |
| 6904 | { |
| 6905 | int unchanged_p = 1; |
| 6906 | |
| 6907 | /* If text or overlays have changed, see where. */ |
| 6908 | if (XFASTINT (w->last_modified) < MODIFF |
| 6909 | || XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF) |
| 6910 | { |
| 6911 | /* Gap in the line? */ |
| 6912 | if (GPT < start || Z - GPT < end) |
| 6913 | unchanged_p = 0; |
| 6914 | |
| 6915 | /* Changes start in front of the line, or end after it? */ |
| 6916 | if (unchanged_p |
| 6917 | && (BEG_UNCHANGED < start - 1 |
| 6918 | || END_UNCHANGED < end)) |
| 6919 | unchanged_p = 0; |
| 6920 | |
| 6921 | /* If selective display, can't optimize if changes start at the |
| 6922 | beginning of the line. */ |
| 6923 | if (unchanged_p |
| 6924 | && INTEGERP (current_buffer->selective_display) |
| 6925 | && XINT (current_buffer->selective_display) > 0 |
| 6926 | && (BEG_UNCHANGED < start || GPT <= start)) |
| 6927 | unchanged_p = 0; |
| 6928 | } |
| 6929 | |
| 6930 | return unchanged_p; |
| 6931 | } |
| 6932 | |
| 6933 | |
| 6934 | /* Do a frame update, taking possible shortcuts into account. This is |
| 6935 | the main external entry point for redisplay. |
| 6936 | |
| 6937 | If the last redisplay displayed an echo area message and that message |
| 6938 | is no longer requested, we clear the echo area or bring back the |
| 6939 | mini-buffer if that is in use. */ |
| 6940 | |
| 6941 | void |
| 6942 | redisplay () |
| 6943 | { |
| 6944 | redisplay_internal (0); |
| 6945 | } |
| 6946 | |
| 6947 | |
| 6948 | /* Reconsider the setting of B->clip_changed which is displayed |
| 6949 | in window W. */ |
| 6950 | |
| 6951 | static INLINE void |
| 6952 | reconsider_clip_changes (w, b) |
| 6953 | struct window *w; |
| 6954 | struct buffer *b; |
| 6955 | { |
| 6956 | if (b->prevent_redisplay_optimizations_p) |
| 6957 | b->clip_changed = 1; |
| 6958 | else if (b->clip_changed |
| 6959 | && !NILP (w->window_end_valid) |
| 6960 | && w->current_matrix->buffer == b |
| 6961 | && w->current_matrix->zv == BUF_ZV (b) |
| 6962 | && w->current_matrix->begv == BUF_BEGV (b)) |
| 6963 | b->clip_changed = 0; |
| 6964 | } |
| 6965 | |
| 6966 | |
| 6967 | /* If PRESERVE_ECHO_AREA is nonzero, it means this redisplay is not in |
| 6968 | response to any user action; therefore, we should preserve the echo |
| 6969 | area. (Actually, our caller does that job.) Perhaps in the future |
| 6970 | avoid recentering windows if it is not necessary; currently that |
| 6971 | causes some problems. */ |
| 6972 | |
| 6973 | static void |
| 6974 | redisplay_internal (preserve_echo_area) |
| 6975 | int preserve_echo_area; |
| 6976 | { |
| 6977 | struct window *w = XWINDOW (selected_window); |
| 6978 | struct frame *f = XFRAME (w->frame); |
| 6979 | int pause; |
| 6980 | int must_finish = 0; |
| 6981 | struct text_pos tlbufpos, tlendpos; |
| 6982 | int number_of_visible_frames; |
| 6983 | int count; |
| 6984 | struct frame *sf = SELECTED_FRAME (); |
| 6985 | |
| 6986 | /* Non-zero means redisplay has to consider all windows on all |
| 6987 | frames. Zero means, only selected_window is considered. */ |
| 6988 | int consider_all_windows_p; |
| 6989 | |
| 6990 | TRACE ((stderr, "redisplay_internal %d\n", redisplaying_p)); |
| 6991 | |
| 6992 | /* No redisplay if running in batch mode or frame is not yet fully |
| 6993 | initialized, or redisplay is explicitly turned off by setting |
| 6994 | Vinhibit_redisplay. */ |
| 6995 | if (noninteractive |
| 6996 | || !NILP (Vinhibit_redisplay) |
| 6997 | || !f->glyphs_initialized_p) |
| 6998 | return; |
| 6999 | |
| 7000 | /* The flag redisplay_performed_directly_p is set by |
| 7001 | direct_output_for_insert when it already did the whole screen |
| 7002 | update necessary. */ |
| 7003 | if (redisplay_performed_directly_p) |
| 7004 | { |
| 7005 | redisplay_performed_directly_p = 0; |
| 7006 | if (!hscroll_windows (selected_window)) |
| 7007 | return; |
| 7008 | } |
| 7009 | |
| 7010 | #ifdef USE_X_TOOLKIT |
| 7011 | if (popup_activated ()) |
| 7012 | return; |
| 7013 | #endif |
| 7014 | |
| 7015 | /* I don't think this happens but let's be paranoid. */ |
| 7016 | if (redisplaying_p) |
| 7017 | return; |
| 7018 | |
| 7019 | /* Record a function that resets redisplaying_p to its old value |
| 7020 | when we leave this function. */ |
| 7021 | count = specpdl_ptr - specpdl; |
| 7022 | record_unwind_protect (unwind_redisplay, make_number (redisplaying_p)); |
| 7023 | ++redisplaying_p; |
| 7024 | |
| 7025 | retry: |
| 7026 | |
| 7027 | reconsider_clip_changes (w, current_buffer); |
| 7028 | |
| 7029 | /* If new fonts have been loaded that make a glyph matrix adjustment |
| 7030 | necessary, do it. */ |
| 7031 | if (fonts_changed_p) |
| 7032 | { |
| 7033 | adjust_glyphs (NULL); |
| 7034 | ++windows_or_buffers_changed; |
| 7035 | fonts_changed_p = 0; |
| 7036 | } |
| 7037 | |
| 7038 | if (! FRAME_WINDOW_P (sf) |
| 7039 | && previous_terminal_frame != sf) |
| 7040 | { |
| 7041 | /* Since frames on an ASCII terminal share the same display |
| 7042 | area, displaying a different frame means redisplay the whole |
| 7043 | thing. */ |
| 7044 | windows_or_buffers_changed++; |
| 7045 | SET_FRAME_GARBAGED (sf); |
| 7046 | XSETFRAME (Vterminal_frame, sf); |
| 7047 | } |
| 7048 | previous_terminal_frame = sf; |
| 7049 | |
| 7050 | /* Set the visible flags for all frames. Do this before checking |
| 7051 | for resized or garbaged frames; they want to know if their frames |
| 7052 | are visible. See the comment in frame.h for |
| 7053 | FRAME_SAMPLE_VISIBILITY. */ |
| 7054 | { |
| 7055 | Lisp_Object tail, frame; |
| 7056 | |
| 7057 | number_of_visible_frames = 0; |
| 7058 | |
| 7059 | FOR_EACH_FRAME (tail, frame) |
| 7060 | { |
| 7061 | struct frame *f = XFRAME (frame); |
| 7062 | |
| 7063 | FRAME_SAMPLE_VISIBILITY (f); |
| 7064 | if (FRAME_VISIBLE_P (f)) |
| 7065 | ++number_of_visible_frames; |
| 7066 | clear_desired_matrices (f); |
| 7067 | } |
| 7068 | } |
| 7069 | |
| 7070 | /* Notice any pending interrupt request to change frame size. */ |
| 7071 | do_pending_window_change (1); |
| 7072 | |
| 7073 | /* Clear frames marked as garbaged. */ |
| 7074 | if (frame_garbaged) |
| 7075 | clear_garbaged_frames (); |
| 7076 | |
| 7077 | /* Build menubar and tool-bar items. */ |
| 7078 | prepare_menu_bars (); |
| 7079 | |
| 7080 | if (windows_or_buffers_changed) |
| 7081 | update_mode_lines++; |
| 7082 | |
| 7083 | /* Detect case that we need to write or remove a star in the mode line. */ |
| 7084 | if ((SAVE_MODIFF < MODIFF) != !NILP (w->last_had_star)) |
| 7085 | { |
| 7086 | w->update_mode_line = Qt; |
| 7087 | if (buffer_shared > 1) |
| 7088 | update_mode_lines++; |
| 7089 | } |
| 7090 | |
| 7091 | /* If %c is in the mode line, update it if needed. */ |
| 7092 | if (!NILP (w->column_number_displayed) |
| 7093 | /* This alternative quickly identifies a common case |
| 7094 | where no change is needed. */ |
| 7095 | && !(PT == XFASTINT (w->last_point) |
| 7096 | && XFASTINT (w->last_modified) >= MODIFF |
| 7097 | && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF) |
| 7098 | && XFASTINT (w->column_number_displayed) != current_column ()) |
| 7099 | w->update_mode_line = Qt; |
| 7100 | |
| 7101 | FRAME_SCROLL_BOTTOM_VPOS (XFRAME (w->frame)) = -1; |
| 7102 | |
| 7103 | /* The variable buffer_shared is set in redisplay_window and |
| 7104 | indicates that we redisplay a buffer in different windows. See |
| 7105 | there. */ |
| 7106 | consider_all_windows_p = update_mode_lines || buffer_shared > 1; |
| 7107 | |
| 7108 | /* If specs for an arrow have changed, do thorough redisplay |
| 7109 | to ensure we remove any arrow that should no longer exist. */ |
| 7110 | if (! EQ (COERCE_MARKER (Voverlay_arrow_position), last_arrow_position) |
| 7111 | || ! EQ (Voverlay_arrow_string, last_arrow_string)) |
| 7112 | consider_all_windows_p = windows_or_buffers_changed = 1; |
| 7113 | |
| 7114 | /* Normally the message* functions will have already displayed and |
| 7115 | updated the echo area, but the frame may have been trashed, or |
| 7116 | the update may have been preempted, so display the echo area |
| 7117 | again here. Checking both message buffers captures the case that |
| 7118 | the echo area should be cleared. */ |
| 7119 | if (!NILP (echo_area_buffer[0]) || !NILP (echo_area_buffer[1])) |
| 7120 | { |
| 7121 | int window_height_changed_p = echo_area_display (0); |
| 7122 | must_finish = 1; |
| 7123 | |
| 7124 | if (fonts_changed_p) |
| 7125 | goto retry; |
| 7126 | else if (window_height_changed_p) |
| 7127 | { |
| 7128 | consider_all_windows_p = 1; |
| 7129 | ++update_mode_lines; |
| 7130 | ++windows_or_buffers_changed; |
| 7131 | |
| 7132 | /* If window configuration was changed, frames may have been |
| 7133 | marked garbaged. Clear them or we will experience |
| 7134 | surprises wrt scrolling. */ |
| 7135 | if (frame_garbaged) |
| 7136 | clear_garbaged_frames (); |
| 7137 | } |
| 7138 | } |
| 7139 | else if (w == XWINDOW (minibuf_window) |
| 7140 | && (current_buffer->clip_changed |
| 7141 | || XFASTINT (w->last_modified) < MODIFF |
| 7142 | || XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF) |
| 7143 | && resize_mini_window (w, 0)) |
| 7144 | { |
| 7145 | /* Resized active mini-window to fit the size of what it is |
| 7146 | showing if its contents might have changed. */ |
| 7147 | must_finish = 1; |
| 7148 | consider_all_windows_p = 1; |
| 7149 | ++windows_or_buffers_changed; |
| 7150 | ++update_mode_lines; |
| 7151 | |
| 7152 | /* If window configuration was changed, frames may have been |
| 7153 | marked garbaged. Clear them or we will experience |
| 7154 | surprises wrt scrolling. */ |
| 7155 | if (frame_garbaged) |
| 7156 | clear_garbaged_frames (); |
| 7157 | } |
| 7158 | |
| 7159 | |
| 7160 | /* If showing the region, and mark has changed, we must redisplay |
| 7161 | the whole window. The assignment to this_line_start_pos prevents |
| 7162 | the optimization directly below this if-statement. */ |
| 7163 | if (((!NILP (Vtransient_mark_mode) |
| 7164 | && !NILP (XBUFFER (w->buffer)->mark_active)) |
| 7165 | != !NILP (w->region_showing)) |
| 7166 | || (!NILP (w->region_showing) |
| 7167 | && !EQ (w->region_showing, |
| 7168 | Fmarker_position (XBUFFER (w->buffer)->mark)))) |
| 7169 | CHARPOS (this_line_start_pos) = 0; |
| 7170 | |
| 7171 | /* Optimize the case that only the line containing the cursor in the |
| 7172 | selected window has changed. Variables starting with this_ are |
| 7173 | set in display_line and record information about the line |
| 7174 | containing the cursor. */ |
| 7175 | tlbufpos = this_line_start_pos; |
| 7176 | tlendpos = this_line_end_pos; |
| 7177 | if (!consider_all_windows_p |
| 7178 | && CHARPOS (tlbufpos) > 0 |
| 7179 | && NILP (w->update_mode_line) |
| 7180 | && !current_buffer->clip_changed |
| 7181 | && FRAME_VISIBLE_P (XFRAME (w->frame)) |
| 7182 | && !FRAME_OBSCURED_P (XFRAME (w->frame)) |
| 7183 | /* Make sure recorded data applies to current buffer, etc. */ |
| 7184 | && this_line_buffer == current_buffer |
| 7185 | && current_buffer == XBUFFER (w->buffer) |
| 7186 | && NILP (w->force_start) |
| 7187 | /* Point must be on the line that we have info recorded about. */ |
| 7188 | && PT >= CHARPOS (tlbufpos) |
| 7189 | && PT <= Z - CHARPOS (tlendpos) |
| 7190 | /* All text outside that line, including its final newline, |
| 7191 | must be unchanged */ |
| 7192 | && text_outside_line_unchanged_p (w, CHARPOS (tlbufpos), |
| 7193 | CHARPOS (tlendpos))) |
| 7194 | { |
| 7195 | if (CHARPOS (tlbufpos) > BEGV |
| 7196 | && FETCH_BYTE (BYTEPOS (tlbufpos) - 1) != '\n' |
| 7197 | && (CHARPOS (tlbufpos) == ZV |
| 7198 | || FETCH_BYTE (BYTEPOS (tlbufpos)) == '\n')) |
| 7199 | /* Former continuation line has disappeared by becoming empty */ |
| 7200 | goto cancel; |
| 7201 | else if (XFASTINT (w->last_modified) < MODIFF |
| 7202 | || XFASTINT (w->last_overlay_modified) < OVERLAY_MODIFF |
| 7203 | || MINI_WINDOW_P (w)) |
| 7204 | { |
| 7205 | /* We have to handle the case of continuation around a |
| 7206 | wide-column character (See the comment in indent.c around |
| 7207 | line 885). |
| 7208 | |
| 7209 | For instance, in the following case: |
| 7210 | |
| 7211 | -------- Insert -------- |
| 7212 | K_A_N_\\ `a' K_A_N_a\ `X_' are wide-column chars. |
| 7213 | J_I_ ==> J_I_ `^^' are cursors. |
| 7214 | ^^ ^^ |
| 7215 | -------- -------- |
| 7216 | |
| 7217 | As we have to redraw the line above, we should goto cancel. */ |
| 7218 | |
| 7219 | struct it it; |
| 7220 | int line_height_before = this_line_pixel_height; |
| 7221 | |
| 7222 | /* Note that start_display will handle the case that the |
| 7223 | line starting at tlbufpos is a continuation lines. */ |
| 7224 | start_display (&it, w, tlbufpos); |
| 7225 | |
| 7226 | /* Implementation note: It this still necessary? */ |
| 7227 | if (it.current_x != this_line_start_x) |
| 7228 | goto cancel; |
| 7229 | |
| 7230 | TRACE ((stderr, "trying display optimization 1\n")); |
| 7231 | w->cursor.vpos = -1; |
| 7232 | overlay_arrow_seen = 0; |
| 7233 | it.vpos = this_line_vpos; |
| 7234 | it.current_y = this_line_y; |
| 7235 | it.glyph_row = MATRIX_ROW (w->desired_matrix, this_line_vpos); |
| 7236 | display_line (&it); |
| 7237 | |
| 7238 | /* If line contains point, is not continued, |
| 7239 | and ends at same distance from eob as before, we win */ |
| 7240 | if (w->cursor.vpos >= 0 |
| 7241 | /* Line is not continued, otherwise this_line_start_pos |
| 7242 | would have been set to 0 in display_line. */ |
| 7243 | && CHARPOS (this_line_start_pos) |
| 7244 | /* Line ends as before. */ |
| 7245 | && CHARPOS (this_line_end_pos) == CHARPOS (tlendpos) |
| 7246 | /* Line has same height as before. Otherwise other lines |
| 7247 | would have to be shifted up or down. */ |
| 7248 | && this_line_pixel_height == line_height_before) |
| 7249 | { |
| 7250 | /* If this is not the window's last line, we must adjust |
| 7251 | the charstarts of the lines below. */ |
| 7252 | if (it.current_y < it.last_visible_y) |
| 7253 | { |
| 7254 | struct glyph_row *row |
| 7255 | = MATRIX_ROW (w->current_matrix, this_line_vpos + 1); |
| 7256 | int delta, delta_bytes; |
| 7257 | |
| 7258 | if (Z - CHARPOS (tlendpos) == ZV) |
| 7259 | { |
| 7260 | /* This line ends at end of (accessible part of) |
| 7261 | buffer. There is no newline to count. */ |
| 7262 | delta = (Z |
| 7263 | - CHARPOS (tlendpos) |
| 7264 | - MATRIX_ROW_START_CHARPOS (row)); |
| 7265 | delta_bytes = (Z_BYTE |
| 7266 | - BYTEPOS (tlendpos) |
| 7267 | - MATRIX_ROW_START_BYTEPOS (row)); |
| 7268 | } |
| 7269 | else |
| 7270 | { |
| 7271 | /* This line ends in a newline. Must take |
| 7272 | account of the newline and the rest of the |
| 7273 | text that follows. */ |
| 7274 | delta = (Z |
| 7275 | - CHARPOS (tlendpos) |
| 7276 | - MATRIX_ROW_START_CHARPOS (row)); |
| 7277 | delta_bytes = (Z_BYTE |
| 7278 | - BYTEPOS (tlendpos) |
| 7279 | - MATRIX_ROW_START_BYTEPOS (row)); |
| 7280 | } |
| 7281 | |
| 7282 | increment_glyph_matrix_buffer_positions (w->current_matrix, |
| 7283 | this_line_vpos + 1, |
| 7284 | w->current_matrix->nrows, |
| 7285 | delta, delta_bytes); |
| 7286 | } |
| 7287 | |
| 7288 | /* If this row displays text now but previously didn't, |
| 7289 | or vice versa, w->window_end_vpos may have to be |
| 7290 | adjusted. */ |
| 7291 | if ((it.glyph_row - 1)->displays_text_p) |
| 7292 | { |
| 7293 | if (XFASTINT (w->window_end_vpos) < this_line_vpos) |
| 7294 | XSETINT (w->window_end_vpos, this_line_vpos); |
| 7295 | } |
| 7296 | else if (XFASTINT (w->window_end_vpos) == this_line_vpos |
| 7297 | && this_line_vpos > 0) |
| 7298 | XSETINT (w->window_end_vpos, this_line_vpos - 1); |
| 7299 | w->window_end_valid = Qnil; |
| 7300 | |
| 7301 | /* Update hint: No need to try to scroll in update_window. */ |
| 7302 | w->desired_matrix->no_scrolling_p = 1; |
| 7303 | |
| 7304 | #if GLYPH_DEBUG |
| 7305 | *w->desired_matrix->method = 0; |
| 7306 | debug_method_add (w, "optimization 1"); |
| 7307 | #endif |
| 7308 | goto update; |
| 7309 | } |
| 7310 | else |
| 7311 | goto cancel; |
| 7312 | } |
| 7313 | else if (/* Cursor position hasn't changed. */ |
| 7314 | PT == XFASTINT (w->last_point) |
| 7315 | /* Make sure the cursor was last displayed |
| 7316 | in this window. Otherwise we have to reposition it. */ |
| 7317 | && 0 <= w->cursor.vpos |
| 7318 | && XINT (w->height) > w->cursor.vpos) |
| 7319 | { |
| 7320 | if (!must_finish) |
| 7321 | { |
| 7322 | do_pending_window_change (1); |
| 7323 | |
| 7324 | /* We used to always goto end_of_redisplay here, but this |
| 7325 | isn't enough if we have a blinking cursor. */ |
| 7326 | if (w->cursor_off_p == w->last_cursor_off_p) |
| 7327 | goto end_of_redisplay; |
| 7328 | } |
| 7329 | goto update; |
| 7330 | } |
| 7331 | /* If highlighting the region, or if the cursor is in the echo area, |
| 7332 | then we can't just move the cursor. */ |
| 7333 | else if (! (!NILP (Vtransient_mark_mode) |
| 7334 | && !NILP (current_buffer->mark_active)) |
| 7335 | && (w == XWINDOW (current_buffer->last_selected_window) |
| 7336 | || highlight_nonselected_windows) |
| 7337 | && NILP (w->region_showing) |
| 7338 | && NILP (Vshow_trailing_whitespace) |
| 7339 | && !cursor_in_echo_area) |
| 7340 | { |
| 7341 | struct it it; |
| 7342 | struct glyph_row *row; |
| 7343 | |
| 7344 | /* Skip from tlbufpos to PT and see where it is. Note that |
| 7345 | PT may be in invisible text. If so, we will end at the |
| 7346 | next visible position. */ |
| 7347 | init_iterator (&it, w, CHARPOS (tlbufpos), BYTEPOS (tlbufpos), |
| 7348 | NULL, DEFAULT_FACE_ID); |
| 7349 | it.current_x = this_line_start_x; |
| 7350 | it.current_y = this_line_y; |
| 7351 | it.vpos = this_line_vpos; |
| 7352 | |
| 7353 | /* The call to move_it_to stops in front of PT, but |
| 7354 | moves over before-strings. */ |
| 7355 | move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS); |
| 7356 | |
| 7357 | if (it.vpos == this_line_vpos |
| 7358 | && (row = MATRIX_ROW (w->current_matrix, this_line_vpos), |
| 7359 | row->enabled_p)) |
| 7360 | { |
| 7361 | xassert (this_line_vpos == it.vpos); |
| 7362 | xassert (this_line_y == it.current_y); |
| 7363 | set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0); |
| 7364 | goto update; |
| 7365 | } |
| 7366 | else |
| 7367 | goto cancel; |
| 7368 | } |
| 7369 | |
| 7370 | cancel: |
| 7371 | /* Text changed drastically or point moved off of line. */ |
| 7372 | SET_MATRIX_ROW_ENABLED_P (w->desired_matrix, this_line_vpos, 0); |
| 7373 | } |
| 7374 | |
| 7375 | CHARPOS (this_line_start_pos) = 0; |
| 7376 | consider_all_windows_p |= buffer_shared > 1; |
| 7377 | ++clear_face_cache_count; |
| 7378 | |
| 7379 | |
| 7380 | /* Build desired matrices. If consider_all_windows_p is non-zero, |
| 7381 | do it for all windows on all frames. Otherwise do it for |
| 7382 | selected_window, only. */ |
| 7383 | |
| 7384 | if (consider_all_windows_p) |
| 7385 | { |
| 7386 | Lisp_Object tail, frame; |
| 7387 | |
| 7388 | /* Clear the face cache eventually. */ |
| 7389 | if (clear_face_cache_count > CLEAR_FACE_CACHE_COUNT) |
| 7390 | { |
| 7391 | clear_face_cache (0); |
| 7392 | clear_face_cache_count = 0; |
| 7393 | } |
| 7394 | |
| 7395 | /* Recompute # windows showing selected buffer. This will be |
| 7396 | incremented each time such a window is displayed. */ |
| 7397 | buffer_shared = 0; |
| 7398 | |
| 7399 | FOR_EACH_FRAME (tail, frame) |
| 7400 | { |
| 7401 | struct frame *f = XFRAME (frame); |
| 7402 | if (FRAME_WINDOW_P (f) || f == sf) |
| 7403 | { |
| 7404 | /* Mark all the scroll bars to be removed; we'll redeem |
| 7405 | the ones we want when we redisplay their windows. */ |
| 7406 | if (condemn_scroll_bars_hook) |
| 7407 | (*condemn_scroll_bars_hook) (f); |
| 7408 | |
| 7409 | if (FRAME_VISIBLE_P (f) && !FRAME_OBSCURED_P (f)) |
| 7410 | redisplay_windows (FRAME_ROOT_WINDOW (f)); |
| 7411 | |
| 7412 | /* Any scroll bars which redisplay_windows should have |
| 7413 | nuked should now go away. */ |
| 7414 | if (judge_scroll_bars_hook) |
| 7415 | (*judge_scroll_bars_hook) (f); |
| 7416 | } |
| 7417 | } |
| 7418 | } |
| 7419 | else if (FRAME_VISIBLE_P (sf) |
| 7420 | && !FRAME_OBSCURED_P (sf)) |
| 7421 | redisplay_window (selected_window, 1); |
| 7422 | |
| 7423 | |
| 7424 | /* Compare desired and current matrices, perform output. */ |
| 7425 | |
| 7426 | update: |
| 7427 | |
| 7428 | /* If fonts changed, display again. */ |
| 7429 | if (fonts_changed_p) |
| 7430 | goto retry; |
| 7431 | |
| 7432 | /* Prevent various kinds of signals during display update. |
| 7433 | stdio is not robust about handling signals, |
| 7434 | which can cause an apparent I/O error. */ |
| 7435 | if (interrupt_input) |
| 7436 | unrequest_sigio (); |
| 7437 | stop_polling (); |
| 7438 | |
| 7439 | if (consider_all_windows_p) |
| 7440 | { |
| 7441 | Lisp_Object tail; |
| 7442 | struct frame *f; |
| 7443 | int hscrolled_p; |
| 7444 | |
| 7445 | pause = 0; |
| 7446 | hscrolled_p = 0; |
| 7447 | |
| 7448 | /* See if we have to hscroll. */ |
| 7449 | for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail)) |
| 7450 | if (FRAMEP (XCAR (tail))) |
| 7451 | { |
| 7452 | f = XFRAME (XCAR (tail)); |
| 7453 | |
| 7454 | if ((FRAME_WINDOW_P (f) |
| 7455 | || f == sf) |
| 7456 | && FRAME_VISIBLE_P (f) |
| 7457 | && !FRAME_OBSCURED_P (f) |
| 7458 | && hscroll_windows (f->root_window)) |
| 7459 | hscrolled_p = 1; |
| 7460 | } |
| 7461 | |
| 7462 | if (hscrolled_p) |
| 7463 | goto retry; |
| 7464 | |
| 7465 | for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail)) |
| 7466 | { |
| 7467 | if (!FRAMEP (XCAR (tail))) |
| 7468 | continue; |
| 7469 | |
| 7470 | f = XFRAME (XCAR (tail)); |
| 7471 | |
| 7472 | if ((FRAME_WINDOW_P (f) || f == sf) |
| 7473 | && FRAME_VISIBLE_P (f) && !FRAME_OBSCURED_P (f)) |
| 7474 | { |
| 7475 | /* Mark all windows as to be updated. */ |
| 7476 | set_window_update_flags (XWINDOW (f->root_window), 1); |
| 7477 | pause |= update_frame (f, 0, 0); |
| 7478 | if (!pause) |
| 7479 | { |
| 7480 | mark_window_display_accurate (f->root_window, 1); |
| 7481 | if (frame_up_to_date_hook != 0) |
| 7482 | (*frame_up_to_date_hook) (f); |
| 7483 | } |
| 7484 | } |
| 7485 | } |
| 7486 | } |
| 7487 | else |
| 7488 | { |
| 7489 | if (FRAME_VISIBLE_P (sf) |
| 7490 | && !FRAME_OBSCURED_P (sf)) |
| 7491 | { |
| 7492 | if (hscroll_windows (selected_window)) |
| 7493 | goto retry; |
| 7494 | |
| 7495 | XWINDOW (selected_window)->must_be_updated_p = 1; |
| 7496 | pause = update_frame (sf, 0, 0); |
| 7497 | } |
| 7498 | else |
| 7499 | pause = 0; |
| 7500 | |
| 7501 | /* We may have called echo_area_display at the top of this |
| 7502 | function. If the echo area is on another frame, that may |
| 7503 | have put text on a frame other than the selected one, so the |
| 7504 | above call to update_frame would not have caught it. Catch |
| 7505 | it here. */ |
| 7506 | { |
| 7507 | Lisp_Object mini_window; |
| 7508 | struct frame *mini_frame; |
| 7509 | |
| 7510 | mini_window = FRAME_MINIBUF_WINDOW (sf); |
| 7511 | mini_frame = XFRAME (WINDOW_FRAME (XWINDOW (mini_window))); |
| 7512 | |
| 7513 | if (mini_frame != sf && FRAME_WINDOW_P (mini_frame)) |
| 7514 | { |
| 7515 | XWINDOW (mini_window)->must_be_updated_p = 1; |
| 7516 | pause |= update_frame (mini_frame, 0, 0); |
| 7517 | if (!pause && hscroll_windows (mini_window)) |
| 7518 | goto retry; |
| 7519 | } |
| 7520 | } |
| 7521 | } |
| 7522 | |
| 7523 | /* If display was paused because of pending input, make sure we do a |
| 7524 | thorough update the next time. */ |
| 7525 | if (pause) |
| 7526 | { |
| 7527 | /* Prevent the optimization at the beginning of |
| 7528 | redisplay_internal that tries a single-line update of the |
| 7529 | line containing the cursor in the selected window. */ |
| 7530 | CHARPOS (this_line_start_pos) = 0; |
| 7531 | |
| 7532 | /* Let the overlay arrow be updated the next time. */ |
| 7533 | if (!NILP (last_arrow_position)) |
| 7534 | { |
| 7535 | last_arrow_position = Qt; |
| 7536 | last_arrow_string = Qt; |
| 7537 | } |
| 7538 | |
| 7539 | /* If we pause after scrolling, some rows in the current |
| 7540 | matrices of some windows are not valid. */ |
| 7541 | if (!WINDOW_FULL_WIDTH_P (w) |
| 7542 | && !FRAME_WINDOW_P (XFRAME (w->frame))) |
| 7543 | update_mode_lines = 1; |
| 7544 | } |
| 7545 | |
| 7546 | /* Now text on frame agrees with windows, so put info into the |
| 7547 | windows for partial redisplay to follow. */ |
| 7548 | if (!pause) |
| 7549 | { |
| 7550 | register struct buffer *b = XBUFFER (w->buffer); |
| 7551 | |
| 7552 | BUF_UNCHANGED_MODIFIED (b) = BUF_MODIFF (b); |
| 7553 | BUF_OVERLAY_UNCHANGED_MODIFIED (b) = BUF_OVERLAY_MODIFF (b); |
| 7554 | BUF_BEG_UNCHANGED (b) = BUF_GPT (b) - BUF_BEG (b); |
| 7555 | BUF_END_UNCHANGED (b) = BUF_Z (b) - BUF_GPT (b); |
| 7556 | |
| 7557 | if (consider_all_windows_p) |
| 7558 | mark_window_display_accurate (FRAME_ROOT_WINDOW (sf), 1); |
| 7559 | else |
| 7560 | { |
| 7561 | XSETFASTINT (w->last_point, BUF_PT (b)); |
| 7562 | w->last_cursor = w->cursor; |
| 7563 | w->last_cursor_off_p = w->cursor_off_p; |
| 7564 | |
| 7565 | b->clip_changed = 0; |
| 7566 | b->prevent_redisplay_optimizations_p = 0; |
| 7567 | w->update_mode_line = Qnil; |
| 7568 | XSETFASTINT (w->last_modified, BUF_MODIFF (b)); |
| 7569 | XSETFASTINT (w->last_overlay_modified, BUF_OVERLAY_MODIFF (b)); |
| 7570 | w->last_had_star |
| 7571 | = (BUF_MODIFF (XBUFFER (w->buffer)) > BUF_SAVE_MODIFF (XBUFFER (w->buffer)) |
| 7572 | ? Qt : Qnil); |
| 7573 | |
| 7574 | /* Record if we are showing a region, so can make sure to |
| 7575 | update it fully at next redisplay. */ |
| 7576 | w->region_showing = (!NILP (Vtransient_mark_mode) |
| 7577 | && (w == XWINDOW (current_buffer->last_selected_window) |
| 7578 | || highlight_nonselected_windows) |
| 7579 | && !NILP (XBUFFER (w->buffer)->mark_active) |
| 7580 | ? Fmarker_position (XBUFFER (w->buffer)->mark) |
| 7581 | : Qnil); |
| 7582 | |
| 7583 | w->window_end_valid = w->buffer; |
| 7584 | last_arrow_position = COERCE_MARKER (Voverlay_arrow_position); |
| 7585 | last_arrow_string = Voverlay_arrow_string; |
| 7586 | if (frame_up_to_date_hook != 0) |
| 7587 | (*frame_up_to_date_hook) (sf); |
| 7588 | |
| 7589 | w->current_matrix->buffer = b; |
| 7590 | w->current_matrix->begv = BUF_BEGV (b); |
| 7591 | w->current_matrix->zv = BUF_ZV (b); |
| 7592 | } |
| 7593 | |
| 7594 | update_mode_lines = 0; |
| 7595 | windows_or_buffers_changed = 0; |
| 7596 | } |
| 7597 | |
| 7598 | /* Start SIGIO interrupts coming again. Having them off during the |
| 7599 | code above makes it less likely one will discard output, but not |
| 7600 | impossible, since there might be stuff in the system buffer here. |
| 7601 | But it is much hairier to try to do anything about that. */ |
| 7602 | if (interrupt_input) |
| 7603 | request_sigio (); |
| 7604 | start_polling (); |
| 7605 | |
| 7606 | /* If a frame has become visible which was not before, redisplay |
| 7607 | again, so that we display it. Expose events for such a frame |
| 7608 | (which it gets when becoming visible) don't call the parts of |
| 7609 | redisplay constructing glyphs, so simply exposing a frame won't |
| 7610 | display anything in this case. So, we have to display these |
| 7611 | frames here explicitly. */ |
| 7612 | if (!pause) |
| 7613 | { |
| 7614 | Lisp_Object tail, frame; |
| 7615 | int new_count = 0; |
| 7616 | |
| 7617 | FOR_EACH_FRAME (tail, frame) |
| 7618 | { |
| 7619 | int this_is_visible = 0; |
| 7620 | |
| 7621 | if (XFRAME (frame)->visible) |
| 7622 | this_is_visible = 1; |
| 7623 | FRAME_SAMPLE_VISIBILITY (XFRAME (frame)); |
| 7624 | if (XFRAME (frame)->visible) |
| 7625 | this_is_visible = 1; |
| 7626 | |
| 7627 | if (this_is_visible) |
| 7628 | new_count++; |
| 7629 | } |
| 7630 | |
| 7631 | if (new_count != number_of_visible_frames) |
| 7632 | windows_or_buffers_changed++; |
| 7633 | } |
| 7634 | |
| 7635 | /* Change frame size now if a change is pending. */ |
| 7636 | do_pending_window_change (1); |
| 7637 | |
| 7638 | /* If we just did a pending size change, or have additional |
| 7639 | visible frames, redisplay again. */ |
| 7640 | if (windows_or_buffers_changed && !pause) |
| 7641 | goto retry; |
| 7642 | |
| 7643 | end_of_redisplay:; |
| 7644 | |
| 7645 | unbind_to (count, Qnil); |
| 7646 | } |
| 7647 | |
| 7648 | |
| 7649 | /* Redisplay, but leave alone any recent echo area message unless |
| 7650 | another message has been requested in its place. |
| 7651 | |
| 7652 | This is useful in situations where you need to redisplay but no |
| 7653 | user action has occurred, making it inappropriate for the message |
| 7654 | area to be cleared. See tracking_off and |
| 7655 | wait_reading_process_input for examples of these situations. */ |
| 7656 | |
| 7657 | void |
| 7658 | redisplay_preserve_echo_area () |
| 7659 | { |
| 7660 | if (!NILP (echo_area_buffer[1])) |
| 7661 | { |
| 7662 | /* We have a previously displayed message, but no current |
| 7663 | message. Redisplay the previous message. */ |
| 7664 | display_last_displayed_message_p = 1; |
| 7665 | redisplay_internal (1); |
| 7666 | display_last_displayed_message_p = 0; |
| 7667 | } |
| 7668 | else |
| 7669 | redisplay_internal (1); |
| 7670 | } |
| 7671 | |
| 7672 | |
| 7673 | /* Function registered with record_unwind_protect in |
| 7674 | redisplay_internal. Clears the flag indicating that a redisplay is |
| 7675 | in progress. */ |
| 7676 | |
| 7677 | static Lisp_Object |
| 7678 | unwind_redisplay (old_redisplaying_p) |
| 7679 | Lisp_Object old_redisplaying_p; |
| 7680 | { |
| 7681 | redisplaying_p = XFASTINT (old_redisplaying_p); |
| 7682 | return Qnil; |
| 7683 | } |
| 7684 | |
| 7685 | |
| 7686 | /* Mark the display of windows in the window tree rooted at WINDOW as |
| 7687 | accurate or inaccurate. If FLAG is non-zero mark display of WINDOW |
| 7688 | as accurate. If FLAG is zero arrange for WINDOW to be redisplayed |
| 7689 | the next time redisplay_internal is called. */ |
| 7690 | |
| 7691 | void |
| 7692 | mark_window_display_accurate (window, accurate_p) |
| 7693 | Lisp_Object window; |
| 7694 | int accurate_p; |
| 7695 | { |
| 7696 | struct window *w; |
| 7697 | |
| 7698 | for (; !NILP (window); window = w->next) |
| 7699 | { |
| 7700 | w = XWINDOW (window); |
| 7701 | |
| 7702 | if (BUFFERP (w->buffer)) |
| 7703 | { |
| 7704 | struct buffer *b = XBUFFER (w->buffer); |
| 7705 | |
| 7706 | XSETFASTINT (w->last_modified, |
| 7707 | accurate_p ? BUF_MODIFF (b) : 0); |
| 7708 | XSETFASTINT (w->last_overlay_modified, |
| 7709 | accurate_p ? BUF_OVERLAY_MODIFF (b) : 0); |
| 7710 | w->last_had_star = (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b) |
| 7711 | ? Qt : Qnil); |
| 7712 | |
| 7713 | #if 0 /* I don't think this is necessary because display_line does it. |
| 7714 | Let's check it. */ |
| 7715 | /* Record if we are showing a region, so can make sure to |
| 7716 | update it fully at next redisplay. */ |
| 7717 | w->region_showing |
| 7718 | = (!NILP (Vtransient_mark_mode) |
| 7719 | && (w == XWINDOW (current_buffer->last_selected_window) |
| 7720 | || highlight_nonselected_windows) |
| 7721 | && (!NILP (b->mark_active) |
| 7722 | ? Fmarker_position (b->mark) |
| 7723 | : Qnil)); |
| 7724 | #endif |
| 7725 | |
| 7726 | if (accurate_p) |
| 7727 | { |
| 7728 | b->clip_changed = 0; |
| 7729 | b->prevent_redisplay_optimizations_p = 0; |
| 7730 | w->current_matrix->buffer = b; |
| 7731 | w->current_matrix->begv = BUF_BEGV (b); |
| 7732 | w->current_matrix->zv = BUF_ZV (b); |
| 7733 | w->last_cursor = w->cursor; |
| 7734 | w->last_cursor_off_p = w->cursor_off_p; |
| 7735 | if (w == XWINDOW (selected_window)) |
| 7736 | w->last_point = BUF_PT (b); |
| 7737 | else |
| 7738 | w->last_point = XMARKER (w->pointm)->charpos; |
| 7739 | } |
| 7740 | } |
| 7741 | |
| 7742 | w->window_end_valid = w->buffer; |
| 7743 | w->update_mode_line = Qnil; |
| 7744 | |
| 7745 | if (!NILP (w->vchild)) |
| 7746 | mark_window_display_accurate (w->vchild, accurate_p); |
| 7747 | if (!NILP (w->hchild)) |
| 7748 | mark_window_display_accurate (w->hchild, accurate_p); |
| 7749 | } |
| 7750 | |
| 7751 | if (accurate_p) |
| 7752 | { |
| 7753 | last_arrow_position = COERCE_MARKER (Voverlay_arrow_position); |
| 7754 | last_arrow_string = Voverlay_arrow_string; |
| 7755 | } |
| 7756 | else |
| 7757 | { |
| 7758 | /* Force a thorough redisplay the next time by setting |
| 7759 | last_arrow_position and last_arrow_string to t, which is |
| 7760 | unequal to any useful value of Voverlay_arrow_... */ |
| 7761 | last_arrow_position = Qt; |
| 7762 | last_arrow_string = Qt; |
| 7763 | } |
| 7764 | } |
| 7765 | |
| 7766 | |
| 7767 | /* Return value in display table DP (Lisp_Char_Table *) for character |
| 7768 | C. Since a display table doesn't have any parent, we don't have to |
| 7769 | follow parent. Do not call this function directly but use the |
| 7770 | macro DISP_CHAR_VECTOR. */ |
| 7771 | |
| 7772 | Lisp_Object |
| 7773 | disp_char_vector (dp, c) |
| 7774 | struct Lisp_Char_Table *dp; |
| 7775 | int c; |
| 7776 | { |
| 7777 | int code[4], i; |
| 7778 | Lisp_Object val; |
| 7779 | |
| 7780 | if (SINGLE_BYTE_CHAR_P (c)) |
| 7781 | return (dp->contents[c]); |
| 7782 | |
| 7783 | SPLIT_NON_ASCII_CHAR (c, code[0], code[1], code[2]); |
| 7784 | if (code[0] != CHARSET_COMPOSITION) |
| 7785 | { |
| 7786 | if (code[1] < 32) |
| 7787 | code[1] = -1; |
| 7788 | else if (code[2] < 32) |
| 7789 | code[2] = -1; |
| 7790 | } |
| 7791 | |
| 7792 | /* Here, the possible range of code[0] (== charset ID) is |
| 7793 | 128..max_charset. Since the top level char table contains data |
| 7794 | for multibyte characters after 256th element, we must increment |
| 7795 | code[0] by 128 to get a correct index. */ |
| 7796 | code[0] += 128; |
| 7797 | code[3] = -1; /* anchor */ |
| 7798 | |
| 7799 | for (i = 0; code[i] >= 0; i++, dp = XCHAR_TABLE (val)) |
| 7800 | { |
| 7801 | val = dp->contents[code[i]]; |
| 7802 | if (!SUB_CHAR_TABLE_P (val)) |
| 7803 | return (NILP (val) ? dp->defalt : val); |
| 7804 | } |
| 7805 | |
| 7806 | /* Here, val is a sub char table. We return the default value of |
| 7807 | it. */ |
| 7808 | return (dp->defalt); |
| 7809 | } |
| 7810 | |
| 7811 | |
| 7812 | \f |
| 7813 | /*********************************************************************** |
| 7814 | Window Redisplay |
| 7815 | ***********************************************************************/ |
| 7816 | |
| 7817 | /* Redisplay all leaf windows in the window tree rooted at WINDOW. */ |
| 7818 | |
| 7819 | static void |
| 7820 | redisplay_windows (window) |
| 7821 | Lisp_Object window; |
| 7822 | { |
| 7823 | while (!NILP (window)) |
| 7824 | { |
| 7825 | struct window *w = XWINDOW (window); |
| 7826 | |
| 7827 | if (!NILP (w->hchild)) |
| 7828 | redisplay_windows (w->hchild); |
| 7829 | else if (!NILP (w->vchild)) |
| 7830 | redisplay_windows (w->vchild); |
| 7831 | else |
| 7832 | redisplay_window (window, 0); |
| 7833 | |
| 7834 | window = w->next; |
| 7835 | } |
| 7836 | } |
| 7837 | |
| 7838 | |
| 7839 | /* Set cursor position of W. PT is assumed to be displayed in ROW. |
| 7840 | DELTA is the number of bytes by which positions recorded in ROW |
| 7841 | differ from current buffer positions. */ |
| 7842 | |
| 7843 | void |
| 7844 | set_cursor_from_row (w, row, matrix, delta, delta_bytes, dy, dvpos) |
| 7845 | struct window *w; |
| 7846 | struct glyph_row *row; |
| 7847 | struct glyph_matrix *matrix; |
| 7848 | int delta, delta_bytes, dy, dvpos; |
| 7849 | { |
| 7850 | struct glyph *glyph = row->glyphs[TEXT_AREA]; |
| 7851 | struct glyph *end = glyph + row->used[TEXT_AREA]; |
| 7852 | int x = row->x; |
| 7853 | int pt_old = PT - delta; |
| 7854 | |
| 7855 | /* Skip over glyphs not having an object at the start of the row. |
| 7856 | These are special glyphs like truncation marks on terminal |
| 7857 | frames. */ |
| 7858 | if (row->displays_text_p) |
| 7859 | while (glyph < end |
| 7860 | && !glyph->object |
| 7861 | && glyph->charpos < 0) |
| 7862 | { |
| 7863 | x += glyph->pixel_width; |
| 7864 | ++glyph; |
| 7865 | } |
| 7866 | |
| 7867 | while (glyph < end |
| 7868 | && glyph->object |
| 7869 | && (!BUFFERP (glyph->object) |
| 7870 | || glyph->charpos < pt_old)) |
| 7871 | { |
| 7872 | x += glyph->pixel_width; |
| 7873 | ++glyph; |
| 7874 | } |
| 7875 | |
| 7876 | w->cursor.hpos = glyph - row->glyphs[TEXT_AREA]; |
| 7877 | w->cursor.x = x; |
| 7878 | w->cursor.vpos = MATRIX_ROW_VPOS (row, matrix) + dvpos; |
| 7879 | w->cursor.y = row->y + dy; |
| 7880 | |
| 7881 | if (w == XWINDOW (selected_window)) |
| 7882 | { |
| 7883 | if (!row->continued_p |
| 7884 | && !MATRIX_ROW_CONTINUATION_LINE_P (row) |
| 7885 | && row->x == 0) |
| 7886 | { |
| 7887 | this_line_buffer = XBUFFER (w->buffer); |
| 7888 | |
| 7889 | CHARPOS (this_line_start_pos) |
| 7890 | = MATRIX_ROW_START_CHARPOS (row) + delta; |
| 7891 | BYTEPOS (this_line_start_pos) |
| 7892 | = MATRIX_ROW_START_BYTEPOS (row) + delta_bytes; |
| 7893 | |
| 7894 | CHARPOS (this_line_end_pos) |
| 7895 | = Z - (MATRIX_ROW_END_CHARPOS (row) + delta); |
| 7896 | BYTEPOS (this_line_end_pos) |
| 7897 | = Z_BYTE - (MATRIX_ROW_END_BYTEPOS (row) + delta_bytes); |
| 7898 | |
| 7899 | this_line_y = w->cursor.y; |
| 7900 | this_line_pixel_height = row->height; |
| 7901 | this_line_vpos = w->cursor.vpos; |
| 7902 | this_line_start_x = row->x; |
| 7903 | } |
| 7904 | else |
| 7905 | CHARPOS (this_line_start_pos) = 0; |
| 7906 | } |
| 7907 | } |
| 7908 | |
| 7909 | |
| 7910 | /* Run window scroll functions, if any, for WINDOW with new window |
| 7911 | start STARTP. Sets the window start of WINDOW to that position. |
| 7912 | |
| 7913 | We assume that the window's buffer is really current. */ |
| 7914 | |
| 7915 | static INLINE struct text_pos |
| 7916 | run_window_scroll_functions (window, startp) |
| 7917 | Lisp_Object window; |
| 7918 | struct text_pos startp; |
| 7919 | { |
| 7920 | struct window *w = XWINDOW (window); |
| 7921 | SET_MARKER_FROM_TEXT_POS (w->start, startp); |
| 7922 | |
| 7923 | if (current_buffer != XBUFFER (w->buffer)) |
| 7924 | abort (); |
| 7925 | |
| 7926 | if (!NILP (Vwindow_scroll_functions)) |
| 7927 | { |
| 7928 | run_hook_with_args_2 (Qwindow_scroll_functions, window, |
| 7929 | make_number (CHARPOS (startp))); |
| 7930 | SET_TEXT_POS_FROM_MARKER (startp, w->start); |
| 7931 | /* In case the hook functions switch buffers. */ |
| 7932 | if (current_buffer != XBUFFER (w->buffer)) |
| 7933 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 7934 | } |
| 7935 | |
| 7936 | return startp; |
| 7937 | } |
| 7938 | |
| 7939 | |
| 7940 | /* Modify the desired matrix of window W and W->vscroll so that the |
| 7941 | line containing the cursor is fully visible. */ |
| 7942 | |
| 7943 | static void |
| 7944 | make_cursor_line_fully_visible (w) |
| 7945 | struct window *w; |
| 7946 | { |
| 7947 | struct glyph_matrix *matrix; |
| 7948 | struct glyph_row *row; |
| 7949 | int header_line_height; |
| 7950 | |
| 7951 | /* It's not always possible to find the cursor, e.g, when a window |
| 7952 | is full of overlay strings. Don't do anything in that case. */ |
| 7953 | if (w->cursor.vpos < 0) |
| 7954 | return; |
| 7955 | |
| 7956 | matrix = w->desired_matrix; |
| 7957 | row = MATRIX_ROW (matrix, w->cursor.vpos); |
| 7958 | |
| 7959 | /* If row->y == top y of window display area, the window isn't tall |
| 7960 | enough to display a single line. There is nothing we can do |
| 7961 | about it. */ |
| 7962 | header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w); |
| 7963 | if (row->y == header_line_height) |
| 7964 | return; |
| 7965 | |
| 7966 | if (MATRIX_ROW_PARTIALLY_VISIBLE_AT_TOP_P (w, row)) |
| 7967 | { |
| 7968 | int dy = row->height - row->visible_height; |
| 7969 | w->vscroll = 0; |
| 7970 | w->cursor.y += dy; |
| 7971 | shift_glyph_matrix (w, matrix, 0, matrix->nrows, dy); |
| 7972 | } |
| 7973 | else if (MATRIX_ROW_PARTIALLY_VISIBLE_AT_BOTTOM_P (w, row)) |
| 7974 | { |
| 7975 | int dy = - (row->height - row->visible_height); |
| 7976 | w->vscroll = dy; |
| 7977 | w->cursor.y += dy; |
| 7978 | shift_glyph_matrix (w, matrix, 0, matrix->nrows, dy); |
| 7979 | } |
| 7980 | |
| 7981 | /* When we change the cursor y-position of the selected window, |
| 7982 | change this_line_y as well so that the display optimization for |
| 7983 | the cursor line of the selected window in redisplay_internal uses |
| 7984 | the correct y-position. */ |
| 7985 | if (w == XWINDOW (selected_window)) |
| 7986 | this_line_y = w->cursor.y; |
| 7987 | } |
| 7988 | |
| 7989 | |
| 7990 | /* Try scrolling PT into view in window WINDOW. JUST_THIS_ONE_P |
| 7991 | non-zero means only WINDOW is redisplayed in redisplay_internal. |
| 7992 | TEMP_SCROLL_STEP has the same meaning as scroll_step, and is used |
| 7993 | in redisplay_window to bring a partially visible line into view in |
| 7994 | the case that only the cursor has moved. |
| 7995 | |
| 7996 | Value is |
| 7997 | |
| 7998 | 1 if scrolling succeeded |
| 7999 | |
| 8000 | 0 if scrolling didn't find point. |
| 8001 | |
| 8002 | -1 if new fonts have been loaded so that we must interrupt |
| 8003 | redisplay, adjust glyph matrices, and try again. */ |
| 8004 | |
| 8005 | static int |
| 8006 | try_scrolling (window, just_this_one_p, scroll_conservatively, |
| 8007 | scroll_step, temp_scroll_step) |
| 8008 | Lisp_Object window; |
| 8009 | int just_this_one_p; |
| 8010 | int scroll_conservatively, scroll_step; |
| 8011 | int temp_scroll_step; |
| 8012 | { |
| 8013 | struct window *w = XWINDOW (window); |
| 8014 | struct frame *f = XFRAME (w->frame); |
| 8015 | struct text_pos scroll_margin_pos; |
| 8016 | struct text_pos pos; |
| 8017 | struct text_pos startp; |
| 8018 | struct it it; |
| 8019 | Lisp_Object window_end; |
| 8020 | int this_scroll_margin; |
| 8021 | int dy = 0; |
| 8022 | int scroll_max; |
| 8023 | int line_height, rc; |
| 8024 | int amount_to_scroll = 0; |
| 8025 | Lisp_Object aggressive; |
| 8026 | int height; |
| 8027 | |
| 8028 | #if GLYPH_DEBUG |
| 8029 | debug_method_add (w, "try_scrolling"); |
| 8030 | #endif |
| 8031 | |
| 8032 | SET_TEXT_POS_FROM_MARKER (startp, w->start); |
| 8033 | |
| 8034 | /* Compute scroll margin height in pixels. We scroll when point is |
| 8035 | within this distance from the top or bottom of the window. */ |
| 8036 | if (scroll_margin > 0) |
| 8037 | { |
| 8038 | this_scroll_margin = min (scroll_margin, XINT (w->height) / 4); |
| 8039 | this_scroll_margin *= CANON_Y_UNIT (f); |
| 8040 | } |
| 8041 | else |
| 8042 | this_scroll_margin = 0; |
| 8043 | |
| 8044 | /* Compute how much we should try to scroll maximally to bring point |
| 8045 | into view. */ |
| 8046 | if (scroll_step) |
| 8047 | scroll_max = scroll_step; |
| 8048 | else if (scroll_conservatively) |
| 8049 | scroll_max = scroll_conservatively; |
| 8050 | else if (temp_scroll_step) |
| 8051 | scroll_max = temp_scroll_step; |
| 8052 | else if (NUMBERP (current_buffer->scroll_down_aggressively) |
| 8053 | || NUMBERP (current_buffer->scroll_up_aggressively)) |
| 8054 | /* We're trying to scroll because of aggressive scrolling |
| 8055 | but no scroll_step is set. Choose an arbitrary one. Maybe |
| 8056 | there should be a variable for this. */ |
| 8057 | scroll_max = 10; |
| 8058 | else |
| 8059 | scroll_max = 0; |
| 8060 | scroll_max *= CANON_Y_UNIT (f); |
| 8061 | |
| 8062 | /* Decide whether we have to scroll down. Start at the window end |
| 8063 | and move this_scroll_margin up to find the position of the scroll |
| 8064 | margin. */ |
| 8065 | window_end = Fwindow_end (window, Qt); |
| 8066 | CHARPOS (scroll_margin_pos) = XINT (window_end); |
| 8067 | BYTEPOS (scroll_margin_pos) = CHAR_TO_BYTE (CHARPOS (scroll_margin_pos)); |
| 8068 | if (this_scroll_margin) |
| 8069 | { |
| 8070 | start_display (&it, w, scroll_margin_pos); |
| 8071 | move_it_vertically (&it, - this_scroll_margin); |
| 8072 | scroll_margin_pos = it.current.pos; |
| 8073 | } |
| 8074 | |
| 8075 | if (PT >= CHARPOS (scroll_margin_pos)) |
| 8076 | { |
| 8077 | int y0; |
| 8078 | |
| 8079 | /* Point is in the scroll margin at the bottom of the window, or |
| 8080 | below. Compute a new window start that makes point visible. */ |
| 8081 | |
| 8082 | /* Compute the distance from the scroll margin to PT. |
| 8083 | Give up if the distance is greater than scroll_max. */ |
| 8084 | start_display (&it, w, scroll_margin_pos); |
| 8085 | y0 = it.current_y; |
| 8086 | move_it_to (&it, PT, 0, it.last_visible_y, -1, |
| 8087 | MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y); |
| 8088 | line_height = (it.max_ascent + it.max_descent |
| 8089 | ? it.max_ascent + it.max_descent |
| 8090 | : last_height); |
| 8091 | dy = it.current_y + line_height - y0; |
| 8092 | if (dy > scroll_max) |
| 8093 | return 0; |
| 8094 | |
| 8095 | /* Move the window start down. If scrolling conservatively, |
| 8096 | move it just enough down to make point visible. If |
| 8097 | scroll_step is set, move it down by scroll_step. */ |
| 8098 | start_display (&it, w, startp); |
| 8099 | |
| 8100 | if (scroll_conservatively) |
| 8101 | amount_to_scroll = dy; |
| 8102 | else if (scroll_step || temp_scroll_step) |
| 8103 | amount_to_scroll = scroll_max; |
| 8104 | else |
| 8105 | { |
| 8106 | aggressive = current_buffer->scroll_down_aggressively; |
| 8107 | height = (WINDOW_DISPLAY_HEIGHT_NO_MODE_LINE (w) |
| 8108 | - WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w)); |
| 8109 | if (NUMBERP (aggressive)) |
| 8110 | amount_to_scroll = XFLOATINT (aggressive) * height; |
| 8111 | } |
| 8112 | |
| 8113 | if (amount_to_scroll <= 0) |
| 8114 | return 0; |
| 8115 | |
| 8116 | move_it_vertically (&it, amount_to_scroll); |
| 8117 | startp = it.current.pos; |
| 8118 | } |
| 8119 | else |
| 8120 | { |
| 8121 | /* See if point is inside the scroll margin at the top of the |
| 8122 | window. */ |
| 8123 | scroll_margin_pos = startp; |
| 8124 | if (this_scroll_margin) |
| 8125 | { |
| 8126 | start_display (&it, w, startp); |
| 8127 | move_it_vertically (&it, this_scroll_margin); |
| 8128 | scroll_margin_pos = it.current.pos; |
| 8129 | } |
| 8130 | |
| 8131 | if (PT < CHARPOS (scroll_margin_pos)) |
| 8132 | { |
| 8133 | /* Point is in the scroll margin at the top of the window or |
| 8134 | above what is displayed in the window. */ |
| 8135 | int y0; |
| 8136 | |
| 8137 | /* Compute the vertical distance from PT to the scroll |
| 8138 | margin position. Give up if distance is greater than |
| 8139 | scroll_max. */ |
| 8140 | SET_TEXT_POS (pos, PT, PT_BYTE); |
| 8141 | start_display (&it, w, pos); |
| 8142 | y0 = it.current_y; |
| 8143 | move_it_to (&it, CHARPOS (scroll_margin_pos), 0, |
| 8144 | it.last_visible_y, -1, |
| 8145 | MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y); |
| 8146 | dy = it.current_y - y0; |
| 8147 | if (dy > scroll_max) |
| 8148 | return 0; |
| 8149 | |
| 8150 | /* Compute new window start. */ |
| 8151 | start_display (&it, w, startp); |
| 8152 | |
| 8153 | if (scroll_conservatively) |
| 8154 | amount_to_scroll = dy; |
| 8155 | else if (scroll_step || temp_scroll_step) |
| 8156 | amount_to_scroll = scroll_max; |
| 8157 | else |
| 8158 | { |
| 8159 | aggressive = current_buffer->scroll_up_aggressively; |
| 8160 | height = (WINDOW_DISPLAY_HEIGHT_NO_MODE_LINE (w) |
| 8161 | - WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w)); |
| 8162 | if (NUMBERP (aggressive)) |
| 8163 | amount_to_scroll = XFLOATINT (aggressive) * height; |
| 8164 | } |
| 8165 | |
| 8166 | if (amount_to_scroll <= 0) |
| 8167 | return 0; |
| 8168 | |
| 8169 | move_it_vertically (&it, - amount_to_scroll); |
| 8170 | startp = it.current.pos; |
| 8171 | } |
| 8172 | } |
| 8173 | |
| 8174 | /* Run window scroll functions. */ |
| 8175 | startp = run_window_scroll_functions (window, startp); |
| 8176 | |
| 8177 | /* Display the window. Give up if new fonts are loaded, or if point |
| 8178 | doesn't appear. */ |
| 8179 | if (!try_window (window, startp)) |
| 8180 | rc = -1; |
| 8181 | else if (w->cursor.vpos < 0) |
| 8182 | { |
| 8183 | clear_glyph_matrix (w->desired_matrix); |
| 8184 | rc = 0; |
| 8185 | } |
| 8186 | else |
| 8187 | { |
| 8188 | /* Maybe forget recorded base line for line number display. */ |
| 8189 | if (!just_this_one_p |
| 8190 | || current_buffer->clip_changed |
| 8191 | || BEG_UNCHANGED < CHARPOS (startp)) |
| 8192 | w->base_line_number = Qnil; |
| 8193 | |
| 8194 | /* If cursor ends up on a partially visible line, shift display |
| 8195 | lines up or down. */ |
| 8196 | make_cursor_line_fully_visible (w); |
| 8197 | rc = 1; |
| 8198 | } |
| 8199 | |
| 8200 | return rc; |
| 8201 | } |
| 8202 | |
| 8203 | |
| 8204 | /* Compute a suitable window start for window W if display of W starts |
| 8205 | on a continuation line. Value is non-zero if a new window start |
| 8206 | was computed. |
| 8207 | |
| 8208 | The new window start will be computed, based on W's width, starting |
| 8209 | from the start of the continued line. It is the start of the |
| 8210 | screen line with the minimum distance from the old start W->start. */ |
| 8211 | |
| 8212 | static int |
| 8213 | compute_window_start_on_continuation_line (w) |
| 8214 | struct window *w; |
| 8215 | { |
| 8216 | struct text_pos pos, start_pos; |
| 8217 | int window_start_changed_p = 0; |
| 8218 | |
| 8219 | SET_TEXT_POS_FROM_MARKER (start_pos, w->start); |
| 8220 | |
| 8221 | /* If window start is on a continuation line... Window start may be |
| 8222 | < BEGV in case there's invisible text at the start of the |
| 8223 | buffer (M-x rmail, for example). */ |
| 8224 | if (CHARPOS (start_pos) > BEGV |
| 8225 | && FETCH_BYTE (BYTEPOS (start_pos) - 1) != '\n') |
| 8226 | { |
| 8227 | struct it it; |
| 8228 | struct glyph_row *row; |
| 8229 | |
| 8230 | /* Handle the case that the window start is out of range. */ |
| 8231 | if (CHARPOS (start_pos) < BEGV) |
| 8232 | SET_TEXT_POS (start_pos, BEGV, BEGV_BYTE); |
| 8233 | else if (CHARPOS (start_pos) > ZV) |
| 8234 | SET_TEXT_POS (start_pos, ZV, ZV_BYTE); |
| 8235 | |
| 8236 | /* Find the start of the continued line. This should be fast |
| 8237 | because scan_buffer is fast (newline cache). */ |
| 8238 | row = w->desired_matrix->rows + (WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0); |
| 8239 | init_iterator (&it, w, CHARPOS (start_pos), BYTEPOS (start_pos), |
| 8240 | row, DEFAULT_FACE_ID); |
| 8241 | reseat_at_previous_visible_line_start (&it); |
| 8242 | |
| 8243 | /* If the line start is "too far" away from the window start, |
| 8244 | say it takes too much time to compute a new window start. */ |
| 8245 | if (CHARPOS (start_pos) - IT_CHARPOS (it) |
| 8246 | < XFASTINT (w->height) * XFASTINT (w->width)) |
| 8247 | { |
| 8248 | int min_distance, distance; |
| 8249 | |
| 8250 | /* Move forward by display lines to find the new window |
| 8251 | start. If window width was enlarged, the new start can |
| 8252 | be expected to be > the old start. If window width was |
| 8253 | decreased, the new window start will be < the old start. |
| 8254 | So, we're looking for the display line start with the |
| 8255 | minimum distance from the old window start. */ |
| 8256 | pos = it.current.pos; |
| 8257 | min_distance = INFINITY; |
| 8258 | while ((distance = abs (CHARPOS (start_pos) - IT_CHARPOS (it))), |
| 8259 | distance < min_distance) |
| 8260 | { |
| 8261 | min_distance = distance; |
| 8262 | pos = it.current.pos; |
| 8263 | move_it_by_lines (&it, 1, 0); |
| 8264 | } |
| 8265 | |
| 8266 | /* Set the window start there. */ |
| 8267 | SET_MARKER_FROM_TEXT_POS (w->start, pos); |
| 8268 | window_start_changed_p = 1; |
| 8269 | } |
| 8270 | } |
| 8271 | |
| 8272 | return window_start_changed_p; |
| 8273 | } |
| 8274 | |
| 8275 | |
| 8276 | /* Redisplay leaf window WINDOW. JUST_THIS_ONE_P non-zero means only |
| 8277 | selected_window is redisplayed. */ |
| 8278 | |
| 8279 | static void |
| 8280 | redisplay_window (window, just_this_one_p) |
| 8281 | Lisp_Object window; |
| 8282 | int just_this_one_p; |
| 8283 | { |
| 8284 | struct window *w = XWINDOW (window); |
| 8285 | struct frame *f = XFRAME (w->frame); |
| 8286 | struct buffer *buffer = XBUFFER (w->buffer); |
| 8287 | struct buffer *old = current_buffer; |
| 8288 | struct text_pos lpoint, opoint, startp; |
| 8289 | int update_mode_line; |
| 8290 | int tem; |
| 8291 | struct it it; |
| 8292 | /* Record it now because it's overwritten. */ |
| 8293 | int current_matrix_up_to_date_p = 0; |
| 8294 | int really_switched_buffer = 0; |
| 8295 | int temp_scroll_step = 0; |
| 8296 | int count = specpdl_ptr - specpdl; |
| 8297 | |
| 8298 | SET_TEXT_POS (lpoint, PT, PT_BYTE); |
| 8299 | opoint = lpoint; |
| 8300 | |
| 8301 | /* W must be a leaf window here. */ |
| 8302 | xassert (!NILP (w->buffer)); |
| 8303 | #if GLYPH_DEBUG |
| 8304 | *w->desired_matrix->method = 0; |
| 8305 | #endif |
| 8306 | |
| 8307 | specbind (Qinhibit_point_motion_hooks, Qt); |
| 8308 | |
| 8309 | reconsider_clip_changes (w, buffer); |
| 8310 | |
| 8311 | /* Has the mode line to be updated? */ |
| 8312 | update_mode_line = (!NILP (w->update_mode_line) |
| 8313 | || update_mode_lines |
| 8314 | || buffer->clip_changed); |
| 8315 | |
| 8316 | if (MINI_WINDOW_P (w)) |
| 8317 | { |
| 8318 | if (w == XWINDOW (echo_area_window) |
| 8319 | && !NILP (echo_area_buffer[0])) |
| 8320 | { |
| 8321 | if (update_mode_line) |
| 8322 | /* We may have to update a tty frame's menu bar or a |
| 8323 | tool-bar. Example `M-x C-h C-h C-g'. */ |
| 8324 | goto finish_menu_bars; |
| 8325 | else |
| 8326 | /* We've already displayed the echo area glyphs in this window. */ |
| 8327 | goto finish_scroll_bars; |
| 8328 | } |
| 8329 | else if (w != XWINDOW (minibuf_window)) |
| 8330 | { |
| 8331 | /* W is a mini-buffer window, but it's not the currently |
| 8332 | active one, so clear it. */ |
| 8333 | int yb = window_text_bottom_y (w); |
| 8334 | struct glyph_row *row; |
| 8335 | int y; |
| 8336 | |
| 8337 | for (y = 0, row = w->desired_matrix->rows; |
| 8338 | y < yb; |
| 8339 | y += row->height, ++row) |
| 8340 | blank_row (w, row, y); |
| 8341 | goto finish_scroll_bars; |
| 8342 | } |
| 8343 | } |
| 8344 | |
| 8345 | /* Otherwise set up data on this window; select its buffer and point |
| 8346 | value. */ |
| 8347 | if (update_mode_line) |
| 8348 | { |
| 8349 | /* Really select the buffer, for the sake of buffer-local |
| 8350 | variables. */ |
| 8351 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 8352 | really_switched_buffer = 1; |
| 8353 | } |
| 8354 | else |
| 8355 | set_buffer_temp (XBUFFER (w->buffer)); |
| 8356 | SET_TEXT_POS (opoint, PT, PT_BYTE); |
| 8357 | |
| 8358 | current_matrix_up_to_date_p |
| 8359 | = (!NILP (w->window_end_valid) |
| 8360 | && !current_buffer->clip_changed |
| 8361 | && XFASTINT (w->last_modified) >= MODIFF |
| 8362 | && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF); |
| 8363 | |
| 8364 | /* When windows_or_buffers_changed is non-zero, we can't rely on |
| 8365 | the window end being valid, so set it to nil there. */ |
| 8366 | if (windows_or_buffers_changed) |
| 8367 | { |
| 8368 | /* If window starts on a continuation line, maybe adjust the |
| 8369 | window start in case the window's width changed. */ |
| 8370 | if (XMARKER (w->start)->buffer == current_buffer) |
| 8371 | compute_window_start_on_continuation_line (w); |
| 8372 | |
| 8373 | w->window_end_valid = Qnil; |
| 8374 | } |
| 8375 | |
| 8376 | /* Some sanity checks. */ |
| 8377 | CHECK_WINDOW_END (w); |
| 8378 | if (Z == Z_BYTE && CHARPOS (opoint) != BYTEPOS (opoint)) |
| 8379 | abort (); |
| 8380 | if (BYTEPOS (opoint) < CHARPOS (opoint)) |
| 8381 | abort (); |
| 8382 | |
| 8383 | /* If %c is in mode line, update it if needed. */ |
| 8384 | if (!NILP (w->column_number_displayed) |
| 8385 | /* This alternative quickly identifies a common case |
| 8386 | where no change is needed. */ |
| 8387 | && !(PT == XFASTINT (w->last_point) |
| 8388 | && XFASTINT (w->last_modified) >= MODIFF |
| 8389 | && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF) |
| 8390 | && XFASTINT (w->column_number_displayed) != current_column ()) |
| 8391 | update_mode_line = 1; |
| 8392 | |
| 8393 | /* Count number of windows showing the selected buffer. An indirect |
| 8394 | buffer counts as its base buffer. */ |
| 8395 | if (!just_this_one_p) |
| 8396 | { |
| 8397 | struct buffer *current_base, *window_base; |
| 8398 | current_base = current_buffer; |
| 8399 | window_base = XBUFFER (XWINDOW (selected_window)->buffer); |
| 8400 | if (current_base->base_buffer) |
| 8401 | current_base = current_base->base_buffer; |
| 8402 | if (window_base->base_buffer) |
| 8403 | window_base = window_base->base_buffer; |
| 8404 | if (current_base == window_base) |
| 8405 | buffer_shared++; |
| 8406 | } |
| 8407 | |
| 8408 | /* Point refers normally to the selected window. For any other |
| 8409 | window, set up appropriate value. */ |
| 8410 | if (!EQ (window, selected_window)) |
| 8411 | { |
| 8412 | int new_pt = XMARKER (w->pointm)->charpos; |
| 8413 | int new_pt_byte = marker_byte_position (w->pointm); |
| 8414 | if (new_pt < BEGV) |
| 8415 | { |
| 8416 | new_pt = BEGV; |
| 8417 | new_pt_byte = BEGV_BYTE; |
| 8418 | set_marker_both (w->pointm, Qnil, BEGV, BEGV_BYTE); |
| 8419 | } |
| 8420 | else if (new_pt > (ZV - 1)) |
| 8421 | { |
| 8422 | new_pt = ZV; |
| 8423 | new_pt_byte = ZV_BYTE; |
| 8424 | set_marker_both (w->pointm, Qnil, ZV, ZV_BYTE); |
| 8425 | } |
| 8426 | |
| 8427 | /* We don't use SET_PT so that the point-motion hooks don't run. */ |
| 8428 | TEMP_SET_PT_BOTH (new_pt, new_pt_byte); |
| 8429 | } |
| 8430 | |
| 8431 | /* If any of the character widths specified in the display table |
| 8432 | have changed, invalidate the width run cache. It's true that |
| 8433 | this may be a bit late to catch such changes, but the rest of |
| 8434 | redisplay goes (non-fatally) haywire when the display table is |
| 8435 | changed, so why should we worry about doing any better? */ |
| 8436 | if (current_buffer->width_run_cache) |
| 8437 | { |
| 8438 | struct Lisp_Char_Table *disptab = buffer_display_table (); |
| 8439 | |
| 8440 | if (! disptab_matches_widthtab (disptab, |
| 8441 | XVECTOR (current_buffer->width_table))) |
| 8442 | { |
| 8443 | invalidate_region_cache (current_buffer, |
| 8444 | current_buffer->width_run_cache, |
| 8445 | BEG, Z); |
| 8446 | recompute_width_table (current_buffer, disptab); |
| 8447 | } |
| 8448 | } |
| 8449 | |
| 8450 | /* If window-start is screwed up, choose a new one. */ |
| 8451 | if (XMARKER (w->start)->buffer != current_buffer) |
| 8452 | goto recenter; |
| 8453 | |
| 8454 | SET_TEXT_POS_FROM_MARKER (startp, w->start); |
| 8455 | |
| 8456 | /* If someone specified a new starting point but did not insist, |
| 8457 | check whether it can be used. */ |
| 8458 | if (!NILP (w->optional_new_start)) |
| 8459 | { |
| 8460 | w->optional_new_start = Qnil; |
| 8461 | /* This takes a mini-buffer prompt into account. */ |
| 8462 | start_display (&it, w, startp); |
| 8463 | move_it_to (&it, PT, 0, it.last_visible_y, -1, |
| 8464 | MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y); |
| 8465 | if (IT_CHARPOS (it) == PT) |
| 8466 | w->force_start = Qt; |
| 8467 | } |
| 8468 | |
| 8469 | /* Handle case where place to start displaying has been specified, |
| 8470 | unless the specified location is outside the accessible range. */ |
| 8471 | if (!NILP (w->force_start) |
| 8472 | || w->frozen_window_start_p) |
| 8473 | { |
| 8474 | w->force_start = Qnil; |
| 8475 | w->vscroll = 0; |
| 8476 | w->window_end_valid = Qnil; |
| 8477 | |
| 8478 | /* Forget any recorded base line for line number display. */ |
| 8479 | if (!current_matrix_up_to_date_p |
| 8480 | || current_buffer->clip_changed) |
| 8481 | w->base_line_number = Qnil; |
| 8482 | |
| 8483 | /* Redisplay the mode line. Select the buffer properly for that. |
| 8484 | Also, run the hook window-scroll-functions |
| 8485 | because we have scrolled. */ |
| 8486 | /* Note, we do this after clearing force_start because |
| 8487 | if there's an error, it is better to forget about force_start |
| 8488 | than to get into an infinite loop calling the hook functions |
| 8489 | and having them get more errors. */ |
| 8490 | if (!update_mode_line |
| 8491 | || ! NILP (Vwindow_scroll_functions)) |
| 8492 | { |
| 8493 | if (!really_switched_buffer) |
| 8494 | { |
| 8495 | set_buffer_temp (old); |
| 8496 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 8497 | really_switched_buffer = 1; |
| 8498 | } |
| 8499 | |
| 8500 | update_mode_line = 1; |
| 8501 | w->update_mode_line = Qt; |
| 8502 | startp = run_window_scroll_functions (window, startp); |
| 8503 | } |
| 8504 | |
| 8505 | XSETFASTINT (w->last_modified, 0); |
| 8506 | XSETFASTINT (w->last_overlay_modified, 0); |
| 8507 | if (CHARPOS (startp) < BEGV) |
| 8508 | SET_TEXT_POS (startp, BEGV, BEGV_BYTE); |
| 8509 | else if (CHARPOS (startp) > ZV) |
| 8510 | SET_TEXT_POS (startp, ZV, ZV_BYTE); |
| 8511 | |
| 8512 | /* Redisplay, then check if cursor has been set during the |
| 8513 | redisplay. Give up if new fonts were loaded. */ |
| 8514 | if (!try_window (window, startp)) |
| 8515 | { |
| 8516 | w->force_start = Qt; |
| 8517 | clear_glyph_matrix (w->desired_matrix); |
| 8518 | goto restore_buffers; |
| 8519 | } |
| 8520 | |
| 8521 | if (w->cursor.vpos < 0 && !w->frozen_window_start_p) |
| 8522 | { |
| 8523 | /* If point does not appear, or on a line that is not fully |
| 8524 | visible, move point so it does appear. The desired |
| 8525 | matrix has been built above, so we can use it. */ |
| 8526 | int height = window_box_height (w) / 2; |
| 8527 | struct glyph_row *row = MATRIX_ROW (w->desired_matrix, 0); |
| 8528 | |
| 8529 | while (row->y < height) |
| 8530 | ++row; |
| 8531 | |
| 8532 | TEMP_SET_PT_BOTH (MATRIX_ROW_START_CHARPOS (row), |
| 8533 | MATRIX_ROW_START_BYTEPOS (row)); |
| 8534 | |
| 8535 | if (w != XWINDOW (selected_window)) |
| 8536 | set_marker_both (w->pointm, Qnil, PT, PT_BYTE); |
| 8537 | else if (current_buffer == old) |
| 8538 | SET_TEXT_POS (lpoint, PT, PT_BYTE); |
| 8539 | |
| 8540 | set_cursor_from_row (w, row, w->desired_matrix, 0, 0, 0, 0); |
| 8541 | |
| 8542 | /* If we are highlighting the region, then we just changed |
| 8543 | the region, so redisplay to show it. */ |
| 8544 | if (!NILP (Vtransient_mark_mode) |
| 8545 | && !NILP (current_buffer->mark_active)) |
| 8546 | { |
| 8547 | clear_glyph_matrix (w->desired_matrix); |
| 8548 | if (!try_window (window, startp)) |
| 8549 | goto restore_buffers; |
| 8550 | } |
| 8551 | } |
| 8552 | |
| 8553 | make_cursor_line_fully_visible (w); |
| 8554 | #if GLYPH_DEBUG |
| 8555 | debug_method_add (w, "forced window start"); |
| 8556 | #endif |
| 8557 | goto done; |
| 8558 | } |
| 8559 | |
| 8560 | /* Handle case where text has not changed, only point, and it has |
| 8561 | not moved off the frame. */ |
| 8562 | if (current_matrix_up_to_date_p |
| 8563 | /* Point may be in this window. */ |
| 8564 | && PT >= CHARPOS (startp) |
| 8565 | /* If we don't check this, we are called to move the cursor in a |
| 8566 | horizontally split window with a current matrix that doesn't |
| 8567 | fit the display. */ |
| 8568 | && !windows_or_buffers_changed |
| 8569 | /* Selective display hasn't changed. */ |
| 8570 | && !current_buffer->clip_changed |
| 8571 | /* If force-mode-line-update was called, really redisplay; |
| 8572 | that's how redisplay is forced after e.g. changing |
| 8573 | buffer-invisibility-spec. */ |
| 8574 | && NILP (w->update_mode_line) |
| 8575 | /* Can't use this case if highlighting a region. When a |
| 8576 | region exists, cursor movement has to do more than just |
| 8577 | set the cursor. */ |
| 8578 | && !(!NILP (Vtransient_mark_mode) |
| 8579 | && !NILP (current_buffer->mark_active)) |
| 8580 | && NILP (w->region_showing) |
| 8581 | && NILP (Vshow_trailing_whitespace) |
| 8582 | /* Right after splitting windows, last_point may be nil. */ |
| 8583 | && INTEGERP (w->last_point) |
| 8584 | /* This code is not used for mini-buffer for the sake of the case |
| 8585 | of redisplaying to replace an echo area message; since in |
| 8586 | that case the mini-buffer contents per se are usually |
| 8587 | unchanged. This code is of no real use in the mini-buffer |
| 8588 | since the handling of this_line_start_pos, etc., in redisplay |
| 8589 | handles the same cases. */ |
| 8590 | && !EQ (window, minibuf_window) |
| 8591 | /* When splitting windows or for new windows, it happens that |
| 8592 | redisplay is called with a nil window_end_vpos or one being |
| 8593 | larger than the window. This should really be fixed in |
| 8594 | window.c. I don't have this on my list, now, so we do |
| 8595 | approximately the same as the old redisplay code. --gerd. */ |
| 8596 | && INTEGERP (w->window_end_vpos) |
| 8597 | && XFASTINT (w->window_end_vpos) < w->current_matrix->nrows |
| 8598 | && (FRAME_WINDOW_P (f) |
| 8599 | || !MARKERP (Voverlay_arrow_position) |
| 8600 | || current_buffer != XMARKER (Voverlay_arrow_position)->buffer)) |
| 8601 | { |
| 8602 | int this_scroll_margin; |
| 8603 | struct glyph_row *row; |
| 8604 | int scroll_p; |
| 8605 | |
| 8606 | #if GLYPH_DEBUG |
| 8607 | debug_method_add (w, "cursor movement"); |
| 8608 | #endif |
| 8609 | |
| 8610 | /* Scroll if point within this distance from the top or bottom |
| 8611 | of the window. This is a pixel value. */ |
| 8612 | this_scroll_margin = max (0, scroll_margin); |
| 8613 | this_scroll_margin = min (this_scroll_margin, XFASTINT (w->height) / 4); |
| 8614 | this_scroll_margin *= CANON_Y_UNIT (f); |
| 8615 | |
| 8616 | /* Start with the row the cursor was displayed during the last |
| 8617 | not paused redisplay. Give up if that row is not valid. */ |
| 8618 | if (w->last_cursor.vpos >= w->current_matrix->nrows) |
| 8619 | goto try_to_scroll; |
| 8620 | row = MATRIX_ROW (w->current_matrix, w->last_cursor.vpos); |
| 8621 | if (row->mode_line_p) |
| 8622 | ++row; |
| 8623 | if (!row->enabled_p) |
| 8624 | goto try_to_scroll; |
| 8625 | |
| 8626 | scroll_p = 0; |
| 8627 | if (PT > XFASTINT (w->last_point)) |
| 8628 | { |
| 8629 | /* Point has moved forward. */ |
| 8630 | int last_y = window_text_bottom_y (w) - this_scroll_margin; |
| 8631 | |
| 8632 | while ((MATRIX_ROW_END_CHARPOS (row) < PT |
| 8633 | /* The end position of a row equals the start |
| 8634 | position of the next row. If PT is there, we |
| 8635 | would rather display it in the next line, except |
| 8636 | when this line ends in ZV. */ |
| 8637 | || (MATRIX_ROW_END_CHARPOS (row) == PT |
| 8638 | && (MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row) |
| 8639 | || !row->ends_at_zv_p))) |
| 8640 | && MATRIX_ROW_BOTTOM_Y (row) < last_y) |
| 8641 | { |
| 8642 | xassert (row->enabled_p); |
| 8643 | ++row; |
| 8644 | } |
| 8645 | |
| 8646 | /* If within the scroll margin, scroll. Note that |
| 8647 | MATRIX_ROW_BOTTOM_Y gives the pixel position at which the |
| 8648 | next line would be drawn, and that this_scroll_margin can |
| 8649 | be zero. */ |
| 8650 | if (MATRIX_ROW_BOTTOM_Y (row) > last_y |
| 8651 | || PT > MATRIX_ROW_END_CHARPOS (row) |
| 8652 | /* Line is completely visible last line in window and PT |
| 8653 | is to be set in the next line. */ |
| 8654 | || (MATRIX_ROW_BOTTOM_Y (row) == last_y |
| 8655 | && PT == MATRIX_ROW_END_CHARPOS (row) |
| 8656 | && !row->ends_at_zv_p |
| 8657 | && !MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row))) |
| 8658 | scroll_p = 1; |
| 8659 | } |
| 8660 | else if (PT < XFASTINT (w->last_point)) |
| 8661 | { |
| 8662 | /* Cursor has to be moved backward. Note that PT >= |
| 8663 | CHARPOS (startp) because of the outer if-statement. */ |
| 8664 | while (!row->mode_line_p |
| 8665 | && (MATRIX_ROW_START_CHARPOS (row) > PT |
| 8666 | || (MATRIX_ROW_START_CHARPOS (row) == PT |
| 8667 | && MATRIX_ROW_STARTS_IN_MIDDLE_OF_CHAR_P (row))) |
| 8668 | && (row->y > this_scroll_margin |
| 8669 | || CHARPOS (startp) == BEGV)) |
| 8670 | { |
| 8671 | xassert (row->enabled_p); |
| 8672 | --row; |
| 8673 | } |
| 8674 | |
| 8675 | /* Consider the following case: Window starts at BEGV, there |
| 8676 | is invisible, intangible text at BEGV, so that display |
| 8677 | starts at some point START > BEGV. It can happen that |
| 8678 | we are called with PT somewhere between BEGV and START. |
| 8679 | Try to handle that case. */ |
| 8680 | if (row < w->current_matrix->rows |
| 8681 | || row->mode_line_p) |
| 8682 | { |
| 8683 | row = w->current_matrix->rows; |
| 8684 | if (row->mode_line_p) |
| 8685 | ++row; |
| 8686 | } |
| 8687 | |
| 8688 | /* Due to newlines in overlay strings, we may have to skip |
| 8689 | forward over overlay strings. */ |
| 8690 | while (MATRIX_ROW_END_CHARPOS (row) == PT |
| 8691 | && MATRIX_ROW_ENDS_IN_OVERLAY_STRING_P (row) |
| 8692 | && !row->ends_at_zv_p) |
| 8693 | ++row; |
| 8694 | |
| 8695 | /* If within the scroll margin, scroll. */ |
| 8696 | if (row->y < this_scroll_margin |
| 8697 | && CHARPOS (startp) != BEGV) |
| 8698 | scroll_p = 1; |
| 8699 | } |
| 8700 | |
| 8701 | /* if PT is not in the glyph row, give up. */ |
| 8702 | if (PT < MATRIX_ROW_START_CHARPOS (row) |
| 8703 | || PT > MATRIX_ROW_END_CHARPOS (row)) |
| 8704 | goto try_to_scroll; |
| 8705 | |
| 8706 | /* If we end up in a partially visible line, let's make it fully |
| 8707 | visible. This can be done most easily by using the existing |
| 8708 | scrolling code. */ |
| 8709 | if (MATRIX_ROW_PARTIALLY_VISIBLE_P (row)) |
| 8710 | { |
| 8711 | temp_scroll_step = 1; |
| 8712 | goto try_to_scroll; |
| 8713 | } |
| 8714 | else if (scroll_p) |
| 8715 | goto try_to_scroll; |
| 8716 | |
| 8717 | set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0); |
| 8718 | goto done; |
| 8719 | } |
| 8720 | |
| 8721 | /* If current starting point was originally the beginning of a line |
| 8722 | but no longer is, find a new starting point. */ |
| 8723 | else if (!NILP (w->start_at_line_beg) |
| 8724 | && !(CHARPOS (startp) <= BEGV |
| 8725 | || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n')) |
| 8726 | { |
| 8727 | #if GLYPH_DEBUG |
| 8728 | debug_method_add (w, "recenter 1"); |
| 8729 | #endif |
| 8730 | goto recenter; |
| 8731 | } |
| 8732 | |
| 8733 | /* Try scrolling with try_window_id. */ |
| 8734 | else if (/* Windows and buffers haven't changed. */ |
| 8735 | !windows_or_buffers_changed |
| 8736 | /* Window must be either use window-based redisplay or |
| 8737 | be full width. */ |
| 8738 | && (FRAME_WINDOW_P (f) |
| 8739 | || (line_ins_del_ok && WINDOW_FULL_WIDTH_P (w))) |
| 8740 | && !MINI_WINDOW_P (w) |
| 8741 | /* Point is not known NOT to appear in window. */ |
| 8742 | && PT >= CHARPOS (startp) |
| 8743 | && XFASTINT (w->last_modified) |
| 8744 | /* Window is not hscrolled. */ |
| 8745 | && XFASTINT (w->hscroll) == 0 |
| 8746 | /* Selective display has not changed. */ |
| 8747 | && !current_buffer->clip_changed |
| 8748 | /* Current matrix is up to date. */ |
| 8749 | && !NILP (w->window_end_valid) |
| 8750 | /* Can't use this case if highlighting a region because |
| 8751 | a cursor movement will do more than just set the cursor. */ |
| 8752 | && !(!NILP (Vtransient_mark_mode) |
| 8753 | && !NILP (current_buffer->mark_active)) |
| 8754 | && NILP (w->region_showing) |
| 8755 | && NILP (Vshow_trailing_whitespace) |
| 8756 | /* Overlay arrow position and string not changed. */ |
| 8757 | && EQ (last_arrow_position, COERCE_MARKER (Voverlay_arrow_position)) |
| 8758 | && EQ (last_arrow_string, Voverlay_arrow_string) |
| 8759 | /* Value is > 0 if update has been done, it is -1 if we |
| 8760 | know that the same window start will not work. It is 0 |
| 8761 | if unsuccessful for some other reason. */ |
| 8762 | && (tem = try_window_id (w)) != 0) |
| 8763 | { |
| 8764 | #if GLYPH_DEBUG |
| 8765 | debug_method_add (w, "try_window_id"); |
| 8766 | #endif |
| 8767 | |
| 8768 | if (fonts_changed_p) |
| 8769 | goto restore_buffers; |
| 8770 | if (tem > 0) |
| 8771 | goto done; |
| 8772 | /* Otherwise try_window_id has returned -1 which means that we |
| 8773 | don't want the alternative below this comment to execute. */ |
| 8774 | } |
| 8775 | else if (CHARPOS (startp) >= BEGV |
| 8776 | && CHARPOS (startp) <= ZV |
| 8777 | && PT >= CHARPOS (startp) |
| 8778 | && (CHARPOS (startp) < ZV |
| 8779 | /* Avoid starting at end of buffer. */ |
| 8780 | || CHARPOS (startp) == BEGV |
| 8781 | || (XFASTINT (w->last_modified) >= MODIFF |
| 8782 | && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF))) |
| 8783 | { |
| 8784 | #if GLYPH_DEBUG |
| 8785 | debug_method_add (w, "same window start"); |
| 8786 | #endif |
| 8787 | |
| 8788 | /* Try to redisplay starting at same place as before. |
| 8789 | If point has not moved off frame, accept the results. */ |
| 8790 | if (!current_matrix_up_to_date_p |
| 8791 | /* Don't use try_window_reusing_current_matrix in this case |
| 8792 | because it can have changed the buffer. */ |
| 8793 | || !NILP (Vwindow_scroll_functions) |
| 8794 | || MINI_WINDOW_P (w) |
| 8795 | || !try_window_reusing_current_matrix (w)) |
| 8796 | { |
| 8797 | IF_DEBUG (debug_method_add (w, "1")); |
| 8798 | try_window (window, startp); |
| 8799 | } |
| 8800 | |
| 8801 | if (fonts_changed_p) |
| 8802 | goto restore_buffers; |
| 8803 | |
| 8804 | if (w->cursor.vpos >= 0) |
| 8805 | { |
| 8806 | if (!just_this_one_p |
| 8807 | || current_buffer->clip_changed |
| 8808 | || BEG_UNCHANGED < CHARPOS (startp)) |
| 8809 | /* Forget any recorded base line for line number display. */ |
| 8810 | w->base_line_number = Qnil; |
| 8811 | |
| 8812 | make_cursor_line_fully_visible (w); |
| 8813 | goto done; |
| 8814 | } |
| 8815 | else |
| 8816 | clear_glyph_matrix (w->desired_matrix); |
| 8817 | } |
| 8818 | |
| 8819 | try_to_scroll: |
| 8820 | |
| 8821 | XSETFASTINT (w->last_modified, 0); |
| 8822 | XSETFASTINT (w->last_overlay_modified, 0); |
| 8823 | |
| 8824 | /* Redisplay the mode line. Select the buffer properly for that. */ |
| 8825 | if (!update_mode_line) |
| 8826 | { |
| 8827 | if (!really_switched_buffer) |
| 8828 | { |
| 8829 | set_buffer_temp (old); |
| 8830 | set_buffer_internal_1 (XBUFFER (w->buffer)); |
| 8831 | really_switched_buffer = 1; |
| 8832 | } |
| 8833 | update_mode_line = 1; |
| 8834 | w->update_mode_line = Qt; |
| 8835 | } |
| 8836 | |
| 8837 | /* Try to scroll by specified few lines. */ |
| 8838 | if ((scroll_conservatively |
| 8839 | || scroll_step |
| 8840 | || temp_scroll_step |
| 8841 | || NUMBERP (current_buffer->scroll_up_aggressively) |
| 8842 | || NUMBERP (current_buffer->scroll_down_aggressively)) |
| 8843 | && !current_buffer->clip_changed |
| 8844 | && CHARPOS (startp) >= BEGV |
| 8845 | && CHARPOS (startp) <= ZV) |
| 8846 | { |
| 8847 | /* The function returns -1 if new fonts were loaded, 1 if |
| 8848 | successful, 0 if not successful. */ |
| 8849 | int rc = try_scrolling (window, just_this_one_p, |
| 8850 | scroll_conservatively, |
| 8851 | scroll_step, |
| 8852 | temp_scroll_step); |
| 8853 | if (rc > 0) |
| 8854 | goto done; |
| 8855 | else if (rc < 0) |
| 8856 | goto restore_buffers; |
| 8857 | } |
| 8858 | |
| 8859 | /* Finally, just choose place to start which centers point */ |
| 8860 | |
| 8861 | recenter: |
| 8862 | |
| 8863 | #if GLYPH_DEBUG |
| 8864 | debug_method_add (w, "recenter"); |
| 8865 | #endif |
| 8866 | |
| 8867 | /* w->vscroll = 0; */ |
| 8868 | |
| 8869 | /* Forget any previously recorded base line for line number display. */ |
| 8870 | if (!current_matrix_up_to_date_p |
| 8871 | || current_buffer->clip_changed) |
| 8872 | w->base_line_number = Qnil; |
| 8873 | |
| 8874 | /* Move backward half the height of the window. */ |
| 8875 | init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID); |
| 8876 | it.current_y = it.last_visible_y; |
| 8877 | move_it_vertically_backward (&it, it.last_visible_y / 2); |
| 8878 | xassert (IT_CHARPOS (it) >= BEGV); |
| 8879 | |
| 8880 | /* The function move_it_vertically_backward may move over more |
| 8881 | than the specified y-distance. If it->w is small, e.g. a |
| 8882 | mini-buffer window, we may end up in front of the window's |
| 8883 | display area. Start displaying at the start of the line |
| 8884 | containing PT in this case. */ |
| 8885 | if (it.current_y <= 0) |
| 8886 | { |
| 8887 | init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID); |
| 8888 | move_it_vertically (&it, 0); |
| 8889 | xassert (IT_CHARPOS (it) <= PT); |
| 8890 | it.current_y = 0; |
| 8891 | } |
| 8892 | |
| 8893 | it.current_x = it.hpos = 0; |
| 8894 | |
| 8895 | /* Set startp here explicitly in case that helps avoid an infinite loop |
| 8896 | in case the window-scroll-functions functions get errors. */ |
| 8897 | set_marker_both (w->start, Qnil, IT_CHARPOS (it), IT_BYTEPOS (it)); |
| 8898 | |
| 8899 | /* Run scroll hooks. */ |
| 8900 | startp = run_window_scroll_functions (window, it.current.pos); |
| 8901 | |
| 8902 | /* Redisplay the window. */ |
| 8903 | if (!current_matrix_up_to_date_p |
| 8904 | || windows_or_buffers_changed |
| 8905 | /* Don't use try_window_reusing_current_matrix in this case |
| 8906 | because it can have changed the buffer. */ |
| 8907 | || !NILP (Vwindow_scroll_functions) |
| 8908 | || !just_this_one_p |
| 8909 | || MINI_WINDOW_P (w) |
| 8910 | || !try_window_reusing_current_matrix (w)) |
| 8911 | try_window (window, startp); |
| 8912 | |
| 8913 | /* If new fonts have been loaded (due to fontsets), give up. We |
| 8914 | have to start a new redisplay since we need to re-adjust glyph |
| 8915 | matrices. */ |
| 8916 | if (fonts_changed_p) |
| 8917 | goto restore_buffers; |
| 8918 | |
| 8919 | /* If cursor did not appear assume that the middle of the window is |
| 8920 | in the first line of the window. Do it again with the next line. |
| 8921 | (Imagine a window of height 100, displaying two lines of height |
| 8922 | 60. Moving back 50 from it->last_visible_y will end in the first |
| 8923 | line.) */ |
| 8924 | if (w->cursor.vpos < 0) |
| 8925 | { |
| 8926 | if (!NILP (w->window_end_valid) |
| 8927 | && PT >= Z - XFASTINT (w->window_end_pos)) |
| 8928 | { |
| 8929 | clear_glyph_matrix (w->desired_matrix); |
| 8930 | move_it_by_lines (&it, 1, 0); |
| 8931 | try_window (window, it.current.pos); |
| 8932 | } |
| 8933 | else if (PT < IT_CHARPOS (it)) |
| 8934 | { |
| 8935 | clear_glyph_matrix (w->desired_matrix); |
| 8936 | move_it_by_lines (&it, -1, 0); |
| 8937 | try_window (window, it.current.pos); |
| 8938 | } |
| 8939 | else |
| 8940 | { |
| 8941 | /* Not much we can do about it. */ |
| 8942 | } |
| 8943 | } |
| 8944 | |
| 8945 | /* Consider the following case: Window starts at BEGV, there is |
| 8946 | invisible, intangible text at BEGV, so that display starts at |
| 8947 | some point START > BEGV. It can happen that we are called with |
| 8948 | PT somewhere between BEGV and START. Try to handle that case. */ |
| 8949 | if (w->cursor.vpos < 0) |
| 8950 | { |
| 8951 | struct glyph_row *row = w->current_matrix->rows; |
| 8952 | if (row->mode_line_p) |
| 8953 | ++row; |
| 8954 | set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0); |
| 8955 | } |
| 8956 | |
| 8957 | make_cursor_line_fully_visible (w); |
| 8958 | |
| 8959 | done: |
| 8960 | |
| 8961 | SET_TEXT_POS_FROM_MARKER (startp, w->start); |
| 8962 | w->start_at_line_beg = ((CHARPOS (startp) == BEGV |
| 8963 | || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n') |
| 8964 | ? Qt : Qnil); |
| 8965 | |
| 8966 | /* Display the mode line, if we must. */ |
| 8967 | if ((update_mode_line |
| 8968 | /* If window not full width, must redo its mode line |
| 8969 | if (a) the window to its side is being redone and |
| 8970 | (b) we do a frame-based redisplay. This is a consequence |
| 8971 | of how inverted lines are drawn in frame-based redisplay. */ |
| 8972 | || (!just_this_one_p |
| 8973 | && !FRAME_WINDOW_P (f) |
| 8974 | && !WINDOW_FULL_WIDTH_P (w)) |
| 8975 | /* Line number to display. */ |
| 8976 | || INTEGERP (w->base_line_pos) |
| 8977 | /* Column number is displayed and different from the one displayed. */ |
| 8978 | || (!NILP (w->column_number_displayed) |
| 8979 | && XFASTINT (w->column_number_displayed) != current_column ())) |
| 8980 | /* This means that the window has a mode line. */ |
| 8981 | && (WINDOW_WANTS_MODELINE_P (w) |
| 8982 | || WINDOW_WANTS_HEADER_LINE_P (w))) |
| 8983 | { |
| 8984 | display_mode_lines (w); |
| 8985 | |
| 8986 | /* If mode line height has changed, arrange for a thorough |
| 8987 | immediate redisplay using the correct mode line height. */ |
| 8988 | if (WINDOW_WANTS_MODELINE_P (w) |
| 8989 | && CURRENT_MODE_LINE_HEIGHT (w) != DESIRED_MODE_LINE_HEIGHT (w)) |
| 8990 | { |
| 8991 | fonts_changed_p = 1; |
| 8992 | MATRIX_MODE_LINE_ROW (w->current_matrix)->height |
| 8993 | = DESIRED_MODE_LINE_HEIGHT (w); |
| 8994 | } |
| 8995 | |
| 8996 | /* If top line height has changed, arrange for a thorough |
| 8997 | immediate redisplay using the correct mode line height. */ |
| 8998 | if (WINDOW_WANTS_HEADER_LINE_P (w) |
| 8999 | && CURRENT_HEADER_LINE_HEIGHT (w) != DESIRED_HEADER_LINE_HEIGHT (w)) |
| 9000 | { |
| 9001 | fonts_changed_p = 1; |
| 9002 | MATRIX_HEADER_LINE_ROW (w->current_matrix)->height |
| 9003 | = DESIRED_HEADER_LINE_HEIGHT (w); |
| 9004 | } |
| 9005 | |
| 9006 | if (fonts_changed_p) |
| 9007 | goto restore_buffers; |
| 9008 | } |
| 9009 | |
| 9010 | if (!line_number_displayed |
| 9011 | && !BUFFERP (w->base_line_pos)) |
| 9012 | { |
| 9013 | w->base_line_pos = Qnil; |
| 9014 | w->base_line_number = Qnil; |
| 9015 | } |
| 9016 | |
| 9017 | finish_menu_bars: |
| 9018 | |
| 9019 | /* When we reach a frame's selected window, redo the frame's menu bar. */ |
| 9020 | if (update_mode_line |
| 9021 | && EQ (FRAME_SELECTED_WINDOW (f), window)) |
| 9022 | { |
| 9023 | int redisplay_menu_p = 0; |
| 9024 | |
| 9025 | if (FRAME_WINDOW_P (f)) |
| 9026 | { |
| 9027 | #if defined (USE_X_TOOLKIT) || defined (HAVE_NTGUI) |
| 9028 | redisplay_menu_p = FRAME_EXTERNAL_MENU_BAR (f); |
| 9029 | #else |
| 9030 | redisplay_menu_p = FRAME_MENU_BAR_LINES (f) > 0; |
| 9031 | #endif |
| 9032 | } |
| 9033 | else |
| 9034 | redisplay_menu_p = FRAME_MENU_BAR_LINES (f) > 0; |
| 9035 | |
| 9036 | if (redisplay_menu_p) |
| 9037 | display_menu_bar (w); |
| 9038 | |
| 9039 | #ifdef HAVE_WINDOW_SYSTEM |
| 9040 | if (WINDOWP (f->tool_bar_window) |
| 9041 | && (FRAME_TOOL_BAR_LINES (f) > 0 |
| 9042 | || auto_resize_tool_bars_p)) |
| 9043 | redisplay_tool_bar (f); |
| 9044 | #endif |
| 9045 | } |
| 9046 | |
| 9047 | finish_scroll_bars: |
| 9048 | |
| 9049 | if (FRAME_HAS_VERTICAL_SCROLL_BARS (f)) |
| 9050 | { |
| 9051 | int start, end, whole; |
| 9052 | |
| 9053 | /* Calculate the start and end positions for the current window. |
| 9054 | At some point, it would be nice to choose between scrollbars |
| 9055 | which reflect the whole buffer size, with special markers |
| 9056 | indicating narrowing, and scrollbars which reflect only the |
| 9057 | visible region. |
| 9058 | |
| 9059 | Note that mini-buffers sometimes aren't displaying any text. */ |
| 9060 | if (!MINI_WINDOW_P (w) |
| 9061 | || (w == XWINDOW (minibuf_window) |
| 9062 | && NILP (echo_area_buffer[0]))) |
| 9063 | { |
| 9064 | whole = ZV - BEGV; |
| 9065 | start = marker_position (w->start) - BEGV; |
| 9066 | /* I don't think this is guaranteed to be right. For the |
| 9067 | moment, we'll pretend it is. */ |
| 9068 | end = (Z - XFASTINT (w->window_end_pos)) - BEGV; |
| 9069 | |
| 9070 | if (end < start) |
| 9071 | end = start; |
| 9072 | if (whole < (end - start)) |
| 9073 | whole = end - start; |
| 9074 | } |
| 9075 | else |
| 9076 | start = end = whole = 0; |
| 9077 | |
| 9078 | /* Indicate what this scroll bar ought to be displaying now. */ |
| 9079 | (*set_vertical_scroll_bar_hook) (w, end - start, whole, start); |
| 9080 | |
| 9081 | /* Note that we actually used the scroll bar attached to this |
| 9082 | window, so it shouldn't be deleted at the end of redisplay. */ |
| 9083 | (*redeem_scroll_bar_hook) (w); |
| 9084 | } |
| 9085 | |
| 9086 | restore_buffers: |
| 9087 | |
| 9088 | /* Restore current_buffer and value of point in it. */ |
| 9089 | TEMP_SET_PT_BOTH (CHARPOS (opoint), BYTEPOS (opoint)); |
| 9090 | if (really_switched_buffer) |
| 9091 | set_buffer_internal_1 (old); |
| 9092 | else |
| 9093 | set_buffer_temp (old); |
| 9094 | TEMP_SET_PT_BOTH (CHARPOS (lpoint), BYTEPOS (lpoint)); |
| 9095 | |
| 9096 | unbind_to (count, Qnil); |
| 9097 | } |
| 9098 | |
| 9099 | |
| 9100 | /* Build the complete desired matrix of WINDOW with a window start |
| 9101 | buffer position POS. Value is non-zero if successful. It is zero |
| 9102 | if fonts were loaded during redisplay which makes re-adjusting |
| 9103 | glyph matrices necessary. */ |
| 9104 | |
| 9105 | int |
| 9106 | try_window (window, pos) |
| 9107 | Lisp_Object window; |
| 9108 | struct text_pos pos; |
| 9109 | { |
| 9110 | struct window *w = XWINDOW (window); |
| 9111 | struct it it; |
| 9112 | struct glyph_row *last_text_row = NULL; |
| 9113 | |
| 9114 | /* Make POS the new window start. */ |
| 9115 | set_marker_both (w->start, Qnil, CHARPOS (pos), BYTEPOS (pos)); |
| 9116 | |
| 9117 | /* Mark cursor position as unknown. No overlay arrow seen. */ |
| 9118 | w->cursor.vpos = -1; |
| 9119 | overlay_arrow_seen = 0; |
| 9120 | |
| 9121 | /* Initialize iterator and info to start at POS. */ |
| 9122 | start_display (&it, w, pos); |
| 9123 | |
| 9124 | /* Display all lines of W. */ |
| 9125 | while (it.current_y < it.last_visible_y) |
| 9126 | { |
| 9127 | if (display_line (&it)) |
| 9128 | last_text_row = it.glyph_row - 1; |
| 9129 | if (fonts_changed_p) |
| 9130 | return 0; |
| 9131 | } |
| 9132 | |
| 9133 | /* If bottom moved off end of frame, change mode line percentage. */ |
| 9134 | if (XFASTINT (w->window_end_pos) <= 0 |
| 9135 | && Z != IT_CHARPOS (it)) |
| 9136 | w->update_mode_line = Qt; |
| 9137 | |
| 9138 | /* Set window_end_pos to the offset of the last character displayed |
| 9139 | on the window from the end of current_buffer. Set |
| 9140 | window_end_vpos to its row number. */ |
| 9141 | if (last_text_row) |
| 9142 | { |
| 9143 | xassert (MATRIX_ROW_DISPLAYS_TEXT_P (last_text_row)); |
| 9144 | w->window_end_bytepos |
| 9145 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row); |
| 9146 | XSETFASTINT (w->window_end_pos, |
| 9147 | Z - MATRIX_ROW_END_CHARPOS (last_text_row)); |
| 9148 | XSETFASTINT (w->window_end_vpos, |
| 9149 | MATRIX_ROW_VPOS (last_text_row, w->desired_matrix)); |
| 9150 | xassert (MATRIX_ROW (w->desired_matrix, XFASTINT (w->window_end_vpos)) |
| 9151 | ->displays_text_p); |
| 9152 | } |
| 9153 | else |
| 9154 | { |
| 9155 | w->window_end_bytepos = 0; |
| 9156 | XSETFASTINT (w->window_end_pos, 0); |
| 9157 | XSETFASTINT (w->window_end_vpos, 0); |
| 9158 | } |
| 9159 | |
| 9160 | /* But that is not valid info until redisplay finishes. */ |
| 9161 | w->window_end_valid = Qnil; |
| 9162 | return 1; |
| 9163 | } |
| 9164 | |
| 9165 | |
| 9166 | \f |
| 9167 | /************************************************************************ |
| 9168 | Window redisplay reusing current matrix when buffer has not changed |
| 9169 | ************************************************************************/ |
| 9170 | |
| 9171 | /* Try redisplay of window W showing an unchanged buffer with a |
| 9172 | different window start than the last time it was displayed by |
| 9173 | reusing its current matrix. Value is non-zero if successful. |
| 9174 | W->start is the new window start. */ |
| 9175 | |
| 9176 | static int |
| 9177 | try_window_reusing_current_matrix (w) |
| 9178 | struct window *w; |
| 9179 | { |
| 9180 | struct frame *f = XFRAME (w->frame); |
| 9181 | struct glyph_row *row, *bottom_row; |
| 9182 | struct it it; |
| 9183 | struct run run; |
| 9184 | struct text_pos start, new_start; |
| 9185 | int nrows_scrolled, i; |
| 9186 | struct glyph_row *last_text_row; |
| 9187 | struct glyph_row *last_reused_text_row; |
| 9188 | struct glyph_row *start_row; |
| 9189 | int start_vpos, min_y, max_y; |
| 9190 | |
| 9191 | /* Right now this function doesn't handle terminal frames. */ |
| 9192 | if (!FRAME_WINDOW_P (f)) |
| 9193 | return 0; |
| 9194 | |
| 9195 | /* Can't do this if region may have changed. */ |
| 9196 | if ((!NILP (Vtransient_mark_mode) |
| 9197 | && !NILP (current_buffer->mark_active)) |
| 9198 | || !NILP (w->region_showing) |
| 9199 | || !NILP (Vshow_trailing_whitespace)) |
| 9200 | return 0; |
| 9201 | |
| 9202 | /* If top-line visibility has changed, give up. */ |
| 9203 | if (WINDOW_WANTS_HEADER_LINE_P (w) |
| 9204 | != MATRIX_HEADER_LINE_ROW (w->current_matrix)->mode_line_p) |
| 9205 | return 0; |
| 9206 | |
| 9207 | /* Give up if old or new display is scrolled vertically. We could |
| 9208 | make this function handle this, but right now it doesn't. */ |
| 9209 | start_row = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9210 | if (w->vscroll || MATRIX_ROW_PARTIALLY_VISIBLE_P (start_row)) |
| 9211 | return 0; |
| 9212 | |
| 9213 | /* The variable new_start now holds the new window start. The old |
| 9214 | start `start' can be determined from the current matrix. */ |
| 9215 | SET_TEXT_POS_FROM_MARKER (new_start, w->start); |
| 9216 | start = start_row->start.pos; |
| 9217 | start_vpos = MATRIX_ROW_VPOS (start_row, w->current_matrix); |
| 9218 | |
| 9219 | /* Clear the desired matrix for the display below. */ |
| 9220 | clear_glyph_matrix (w->desired_matrix); |
| 9221 | |
| 9222 | if (CHARPOS (new_start) <= CHARPOS (start)) |
| 9223 | { |
| 9224 | int first_row_y; |
| 9225 | |
| 9226 | IF_DEBUG (debug_method_add (w, "twu1")); |
| 9227 | |
| 9228 | /* Display up to a row that can be reused. The variable |
| 9229 | last_text_row is set to the last row displayed that displays |
| 9230 | text. */ |
| 9231 | start_display (&it, w, new_start); |
| 9232 | first_row_y = it.current_y; |
| 9233 | w->cursor.vpos = -1; |
| 9234 | last_text_row = last_reused_text_row = NULL; |
| 9235 | while (it.current_y < it.last_visible_y |
| 9236 | && IT_CHARPOS (it) < CHARPOS (start) |
| 9237 | && !fonts_changed_p) |
| 9238 | if (display_line (&it)) |
| 9239 | last_text_row = it.glyph_row - 1; |
| 9240 | |
| 9241 | /* A value of current_y < last_visible_y means that we stopped |
| 9242 | at the previous window start, which in turn means that we |
| 9243 | have at least one reusable row. */ |
| 9244 | if (it.current_y < it.last_visible_y) |
| 9245 | { |
| 9246 | nrows_scrolled = it.vpos; |
| 9247 | |
| 9248 | /* Find PT if not already found in the lines displayed. */ |
| 9249 | if (w->cursor.vpos < 0) |
| 9250 | { |
| 9251 | int dy = it.current_y - first_row_y; |
| 9252 | |
| 9253 | row = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9254 | while (MATRIX_ROW_DISPLAYS_TEXT_P (row)) |
| 9255 | { |
| 9256 | if (PT >= MATRIX_ROW_START_CHARPOS (row) |
| 9257 | && PT < MATRIX_ROW_END_CHARPOS (row)) |
| 9258 | { |
| 9259 | set_cursor_from_row (w, row, w->current_matrix, 0, 0, |
| 9260 | dy, nrows_scrolled); |
| 9261 | break; |
| 9262 | } |
| 9263 | |
| 9264 | if (MATRIX_ROW_BOTTOM_Y (row) + dy >= it.last_visible_y) |
| 9265 | break; |
| 9266 | |
| 9267 | ++row; |
| 9268 | } |
| 9269 | |
| 9270 | /* Give up if point was not found. This shouldn't |
| 9271 | happen often; not more often than with try_window |
| 9272 | itself. */ |
| 9273 | if (w->cursor.vpos < 0) |
| 9274 | { |
| 9275 | clear_glyph_matrix (w->desired_matrix); |
| 9276 | return 0; |
| 9277 | } |
| 9278 | } |
| 9279 | |
| 9280 | /* Scroll the display. Do it before the current matrix is |
| 9281 | changed. The problem here is that update has not yet |
| 9282 | run, i.e. part of the current matrix is not up to date. |
| 9283 | scroll_run_hook will clear the cursor, and use the |
| 9284 | current matrix to get the height of the row the cursor is |
| 9285 | in. */ |
| 9286 | run.current_y = first_row_y; |
| 9287 | run.desired_y = it.current_y; |
| 9288 | run.height = it.last_visible_y - it.current_y; |
| 9289 | if (run.height > 0) |
| 9290 | { |
| 9291 | update_begin (f); |
| 9292 | rif->update_window_begin_hook (w); |
| 9293 | rif->scroll_run_hook (w, &run); |
| 9294 | rif->update_window_end_hook (w, 0); |
| 9295 | update_end (f); |
| 9296 | } |
| 9297 | |
| 9298 | /* Shift current matrix down by nrows_scrolled lines. */ |
| 9299 | bottom_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w); |
| 9300 | rotate_matrix (w->current_matrix, |
| 9301 | start_vpos, |
| 9302 | MATRIX_ROW_VPOS (bottom_row, w->current_matrix), |
| 9303 | nrows_scrolled); |
| 9304 | |
| 9305 | /* Disable lines not reused. */ |
| 9306 | for (i = 0; i < it.vpos; ++i) |
| 9307 | MATRIX_ROW (w->current_matrix, i)->enabled_p = 0; |
| 9308 | |
| 9309 | /* Re-compute Y positions. */ |
| 9310 | row = MATRIX_FIRST_TEXT_ROW (w->current_matrix) + nrows_scrolled; |
| 9311 | min_y = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w); |
| 9312 | max_y = it.last_visible_y; |
| 9313 | while (row < bottom_row) |
| 9314 | { |
| 9315 | row->y = it.current_y; |
| 9316 | |
| 9317 | if (row->y < min_y) |
| 9318 | row->visible_height = row->height - (min_y - row->y); |
| 9319 | else if (row->y + row->height > max_y) |
| 9320 | row->visible_height |
| 9321 | = row->height - (row->y + row->height - max_y); |
| 9322 | else |
| 9323 | row->visible_height = row->height; |
| 9324 | |
| 9325 | it.current_y += row->height; |
| 9326 | ++it.vpos; |
| 9327 | |
| 9328 | if (MATRIX_ROW_DISPLAYS_TEXT_P (row)) |
| 9329 | last_reused_text_row = row; |
| 9330 | if (MATRIX_ROW_BOTTOM_Y (row) >= it.last_visible_y) |
| 9331 | break; |
| 9332 | ++row; |
| 9333 | } |
| 9334 | } |
| 9335 | |
| 9336 | /* Update window_end_pos etc.; last_reused_text_row is the last |
| 9337 | reused row from the current matrix containing text, if any. |
| 9338 | The value of last_text_row is the last displayed line |
| 9339 | containing text. */ |
| 9340 | if (last_reused_text_row) |
| 9341 | { |
| 9342 | w->window_end_bytepos |
| 9343 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_reused_text_row); |
| 9344 | XSETFASTINT (w->window_end_pos, |
| 9345 | Z - MATRIX_ROW_END_CHARPOS (last_reused_text_row)); |
| 9346 | XSETFASTINT (w->window_end_vpos, |
| 9347 | MATRIX_ROW_VPOS (last_reused_text_row, |
| 9348 | w->current_matrix)); |
| 9349 | } |
| 9350 | else if (last_text_row) |
| 9351 | { |
| 9352 | w->window_end_bytepos |
| 9353 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row); |
| 9354 | XSETFASTINT (w->window_end_pos, |
| 9355 | Z - MATRIX_ROW_END_CHARPOS (last_text_row)); |
| 9356 | XSETFASTINT (w->window_end_vpos, |
| 9357 | MATRIX_ROW_VPOS (last_text_row, w->desired_matrix)); |
| 9358 | } |
| 9359 | else |
| 9360 | { |
| 9361 | /* This window must be completely empty. */ |
| 9362 | w->window_end_bytepos = 0; |
| 9363 | XSETFASTINT (w->window_end_pos, 0); |
| 9364 | XSETFASTINT (w->window_end_vpos, 0); |
| 9365 | } |
| 9366 | w->window_end_valid = Qnil; |
| 9367 | |
| 9368 | /* Update hint: don't try scrolling again in update_window. */ |
| 9369 | w->desired_matrix->no_scrolling_p = 1; |
| 9370 | |
| 9371 | #if GLYPH_DEBUG |
| 9372 | debug_method_add (w, "try_window_reusing_current_matrix 1"); |
| 9373 | #endif |
| 9374 | return 1; |
| 9375 | } |
| 9376 | else if (CHARPOS (new_start) > CHARPOS (start)) |
| 9377 | { |
| 9378 | struct glyph_row *pt_row, *row; |
| 9379 | struct glyph_row *first_reusable_row; |
| 9380 | struct glyph_row *first_row_to_display; |
| 9381 | int dy; |
| 9382 | int yb = window_text_bottom_y (w); |
| 9383 | |
| 9384 | IF_DEBUG (debug_method_add (w, "twu2")); |
| 9385 | |
| 9386 | /* Find the row starting at new_start, if there is one. Don't |
| 9387 | reuse a partially visible line at the end. */ |
| 9388 | first_reusable_row = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9389 | while (first_reusable_row->enabled_p |
| 9390 | && MATRIX_ROW_BOTTOM_Y (first_reusable_row) < yb |
| 9391 | && (MATRIX_ROW_START_CHARPOS (first_reusable_row) |
| 9392 | < CHARPOS (new_start))) |
| 9393 | ++first_reusable_row; |
| 9394 | |
| 9395 | /* Give up if there is no row to reuse. */ |
| 9396 | if (MATRIX_ROW_BOTTOM_Y (first_reusable_row) >= yb |
| 9397 | || !first_reusable_row->enabled_p |
| 9398 | || (MATRIX_ROW_START_CHARPOS (first_reusable_row) |
| 9399 | != CHARPOS (new_start))) |
| 9400 | return 0; |
| 9401 | |
| 9402 | /* We can reuse fully visible rows beginning with |
| 9403 | first_reusable_row to the end of the window. Set |
| 9404 | first_row_to_display to the first row that cannot be reused. |
| 9405 | Set pt_row to the row containing point, if there is any. */ |
| 9406 | first_row_to_display = first_reusable_row; |
| 9407 | pt_row = NULL; |
| 9408 | while (MATRIX_ROW_BOTTOM_Y (first_row_to_display) < yb) |
| 9409 | { |
| 9410 | if (PT >= MATRIX_ROW_START_CHARPOS (first_row_to_display) |
| 9411 | && PT < MATRIX_ROW_END_CHARPOS (first_row_to_display)) |
| 9412 | pt_row = first_row_to_display; |
| 9413 | |
| 9414 | ++first_row_to_display; |
| 9415 | } |
| 9416 | |
| 9417 | /* Start displaying at the start of first_row_to_display. */ |
| 9418 | xassert (first_row_to_display->y < yb); |
| 9419 | init_to_row_start (&it, w, first_row_to_display); |
| 9420 | nrows_scrolled = MATRIX_ROW_VPOS (first_reusable_row, w->current_matrix); |
| 9421 | it.vpos = (MATRIX_ROW_VPOS (first_row_to_display, w->current_matrix) |
| 9422 | - nrows_scrolled); |
| 9423 | it.current_y = first_row_to_display->y - first_reusable_row->y; |
| 9424 | |
| 9425 | /* Display lines beginning with first_row_to_display in the |
| 9426 | desired matrix. Set last_text_row to the last row displayed |
| 9427 | that displays text. */ |
| 9428 | it.glyph_row = MATRIX_ROW (w->desired_matrix, it.vpos); |
| 9429 | if (pt_row == NULL) |
| 9430 | w->cursor.vpos = -1; |
| 9431 | last_text_row = NULL; |
| 9432 | while (it.current_y < it.last_visible_y && !fonts_changed_p) |
| 9433 | if (display_line (&it)) |
| 9434 | last_text_row = it.glyph_row - 1; |
| 9435 | |
| 9436 | /* Give up If point isn't in a row displayed or reused. */ |
| 9437 | if (w->cursor.vpos < 0) |
| 9438 | { |
| 9439 | clear_glyph_matrix (w->desired_matrix); |
| 9440 | return 0; |
| 9441 | } |
| 9442 | |
| 9443 | /* If point is in a reused row, adjust y and vpos of the cursor |
| 9444 | position. */ |
| 9445 | if (pt_row) |
| 9446 | { |
| 9447 | w->cursor.vpos -= MATRIX_ROW_VPOS (first_reusable_row, |
| 9448 | w->current_matrix); |
| 9449 | w->cursor.y -= first_reusable_row->y; |
| 9450 | } |
| 9451 | |
| 9452 | /* Scroll the display. */ |
| 9453 | run.current_y = first_reusable_row->y; |
| 9454 | run.desired_y = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w); |
| 9455 | run.height = it.last_visible_y - run.current_y; |
| 9456 | if (run.height) |
| 9457 | { |
| 9458 | struct frame *f = XFRAME (WINDOW_FRAME (w)); |
| 9459 | update_begin (f); |
| 9460 | rif->update_window_begin_hook (w); |
| 9461 | rif->scroll_run_hook (w, &run); |
| 9462 | rif->update_window_end_hook (w, 0); |
| 9463 | update_end (f); |
| 9464 | } |
| 9465 | |
| 9466 | /* Adjust Y positions of reused rows. */ |
| 9467 | bottom_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w); |
| 9468 | row = first_reusable_row; |
| 9469 | dy = first_reusable_row->y; |
| 9470 | min_y = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (w); |
| 9471 | max_y = it.last_visible_y; |
| 9472 | while (row < first_row_to_display) |
| 9473 | { |
| 9474 | row->y -= dy; |
| 9475 | if (row->y < min_y) |
| 9476 | row->visible_height = row->height - (min_y - row->y); |
| 9477 | else if (row->y + row->height > max_y) |
| 9478 | row->visible_height |
| 9479 | = row->height - (row->y + row->height - max_y); |
| 9480 | else |
| 9481 | row->visible_height = row->height; |
| 9482 | ++row; |
| 9483 | } |
| 9484 | |
| 9485 | /* Disable rows not reused. */ |
| 9486 | while (row < bottom_row) |
| 9487 | { |
| 9488 | row->enabled_p = 0; |
| 9489 | ++row; |
| 9490 | } |
| 9491 | |
| 9492 | /* Scroll the current matrix. */ |
| 9493 | xassert (nrows_scrolled > 0); |
| 9494 | rotate_matrix (w->current_matrix, |
| 9495 | start_vpos, |
| 9496 | MATRIX_ROW_VPOS (bottom_row, w->current_matrix), |
| 9497 | -nrows_scrolled); |
| 9498 | |
| 9499 | /* Adjust window end. A null value of last_text_row means that |
| 9500 | the window end is in reused rows which in turn means that |
| 9501 | only its vpos can have changed. */ |
| 9502 | if (last_text_row) |
| 9503 | { |
| 9504 | w->window_end_bytepos |
| 9505 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row); |
| 9506 | XSETFASTINT (w->window_end_pos, |
| 9507 | Z - MATRIX_ROW_END_CHARPOS (last_text_row)); |
| 9508 | XSETFASTINT (w->window_end_vpos, |
| 9509 | MATRIX_ROW_VPOS (last_text_row, w->desired_matrix)); |
| 9510 | } |
| 9511 | else |
| 9512 | { |
| 9513 | XSETFASTINT (w->window_end_vpos, |
| 9514 | XFASTINT (w->window_end_vpos) - nrows_scrolled); |
| 9515 | } |
| 9516 | |
| 9517 | w->window_end_valid = Qnil; |
| 9518 | w->desired_matrix->no_scrolling_p = 1; |
| 9519 | |
| 9520 | #if GLYPH_DEBUG |
| 9521 | debug_method_add (w, "try_window_reusing_current_matrix 2"); |
| 9522 | #endif |
| 9523 | return 1; |
| 9524 | } |
| 9525 | |
| 9526 | return 0; |
| 9527 | } |
| 9528 | |
| 9529 | |
| 9530 | \f |
| 9531 | /************************************************************************ |
| 9532 | Window redisplay reusing current matrix when buffer has changed |
| 9533 | ************************************************************************/ |
| 9534 | |
| 9535 | static struct glyph_row *get_last_unchanged_at_beg_row P_ ((struct window *)); |
| 9536 | static struct glyph_row *get_first_unchanged_at_end_row P_ ((struct window *, |
| 9537 | int *, int *)); |
| 9538 | static struct glyph_row * |
| 9539 | find_last_row_displaying_text P_ ((struct glyph_matrix *, struct it *, |
| 9540 | struct glyph_row *)); |
| 9541 | |
| 9542 | |
| 9543 | /* Return the last row in MATRIX displaying text. If row START is |
| 9544 | non-null, start searching with that row. IT gives the dimensions |
| 9545 | of the display. Value is null if matrix is empty; otherwise it is |
| 9546 | a pointer to the row found. */ |
| 9547 | |
| 9548 | static struct glyph_row * |
| 9549 | find_last_row_displaying_text (matrix, it, start) |
| 9550 | struct glyph_matrix *matrix; |
| 9551 | struct it *it; |
| 9552 | struct glyph_row *start; |
| 9553 | { |
| 9554 | struct glyph_row *row, *row_found; |
| 9555 | |
| 9556 | /* Set row_found to the last row in IT->w's current matrix |
| 9557 | displaying text. The loop looks funny but think of partially |
| 9558 | visible lines. */ |
| 9559 | row_found = NULL; |
| 9560 | row = start ? start : MATRIX_FIRST_TEXT_ROW (matrix); |
| 9561 | while (MATRIX_ROW_DISPLAYS_TEXT_P (row)) |
| 9562 | { |
| 9563 | xassert (row->enabled_p); |
| 9564 | row_found = row; |
| 9565 | if (MATRIX_ROW_BOTTOM_Y (row) >= it->last_visible_y) |
| 9566 | break; |
| 9567 | ++row; |
| 9568 | } |
| 9569 | |
| 9570 | return row_found; |
| 9571 | } |
| 9572 | |
| 9573 | |
| 9574 | /* Return the last row in the current matrix of W that is not affected |
| 9575 | by changes at the start of current_buffer that occurred since the |
| 9576 | last time W was redisplayed. Value is null if no such row exists. |
| 9577 | |
| 9578 | The global variable beg_unchanged has to contain the number of |
| 9579 | bytes unchanged at the start of current_buffer. BEG + |
| 9580 | beg_unchanged is the buffer position of the first changed byte in |
| 9581 | current_buffer. Characters at positions < BEG + beg_unchanged are |
| 9582 | at the same buffer positions as they were when the current matrix |
| 9583 | was built. */ |
| 9584 | |
| 9585 | static struct glyph_row * |
| 9586 | get_last_unchanged_at_beg_row (w) |
| 9587 | struct window *w; |
| 9588 | { |
| 9589 | int first_changed_pos = BEG + BEG_UNCHANGED; |
| 9590 | struct glyph_row *row; |
| 9591 | struct glyph_row *row_found = NULL; |
| 9592 | int yb = window_text_bottom_y (w); |
| 9593 | |
| 9594 | /* Find the last row displaying unchanged text. */ |
| 9595 | row = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9596 | while (MATRIX_ROW_DISPLAYS_TEXT_P (row) |
| 9597 | && MATRIX_ROW_START_CHARPOS (row) < first_changed_pos) |
| 9598 | { |
| 9599 | if (/* If row ends before first_changed_pos, it is unchanged, |
| 9600 | except in some case. */ |
| 9601 | MATRIX_ROW_END_CHARPOS (row) <= first_changed_pos |
| 9602 | /* When row ends in ZV and we write at ZV it is not |
| 9603 | unchanged. */ |
| 9604 | && !row->ends_at_zv_p |
| 9605 | /* When first_changed_pos is the end of a continued line, |
| 9606 | row is not unchanged because it may be no longer |
| 9607 | continued. */ |
| 9608 | && !(MATRIX_ROW_END_CHARPOS (row) == first_changed_pos |
| 9609 | && row->continued_p)) |
| 9610 | row_found = row; |
| 9611 | |
| 9612 | /* Stop if last visible row. */ |
| 9613 | if (MATRIX_ROW_BOTTOM_Y (row) >= yb) |
| 9614 | break; |
| 9615 | |
| 9616 | ++row; |
| 9617 | } |
| 9618 | |
| 9619 | return row_found; |
| 9620 | } |
| 9621 | |
| 9622 | |
| 9623 | /* Find the first glyph row in the current matrix of W that is not |
| 9624 | affected by changes at the end of current_buffer since the last |
| 9625 | time the window was redisplayed. Return in *DELTA the number of |
| 9626 | chars by which buffer positions in unchanged text at the end of |
| 9627 | current_buffer must be adjusted. Return in *DELTA_BYTES the |
| 9628 | corresponding number of bytes. Value is null if no such row |
| 9629 | exists, i.e. all rows are affected by changes. */ |
| 9630 | |
| 9631 | static struct glyph_row * |
| 9632 | get_first_unchanged_at_end_row (w, delta, delta_bytes) |
| 9633 | struct window *w; |
| 9634 | int *delta, *delta_bytes; |
| 9635 | { |
| 9636 | struct glyph_row *row; |
| 9637 | struct glyph_row *row_found = NULL; |
| 9638 | |
| 9639 | *delta = *delta_bytes = 0; |
| 9640 | |
| 9641 | /* A value of window_end_pos >= end_unchanged means that the window |
| 9642 | end is in the range of changed text. If so, there is no |
| 9643 | unchanged row at the end of W's current matrix. */ |
| 9644 | xassert (!NILP (w->window_end_valid)); |
| 9645 | if (XFASTINT (w->window_end_pos) >= END_UNCHANGED) |
| 9646 | return NULL; |
| 9647 | |
| 9648 | /* Set row to the last row in W's current matrix displaying text. */ |
| 9649 | row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos)); |
| 9650 | |
| 9651 | /* If matrix is entirely empty, no unchanged row exists. */ |
| 9652 | if (MATRIX_ROW_DISPLAYS_TEXT_P (row)) |
| 9653 | { |
| 9654 | /* The value of row is the last glyph row in the matrix having a |
| 9655 | meaningful buffer position in it. The end position of row |
| 9656 | corresponds to window_end_pos. This allows us to translate |
| 9657 | buffer positions in the current matrix to current buffer |
| 9658 | positions for characters not in changed text. */ |
| 9659 | int Z_old = MATRIX_ROW_END_CHARPOS (row) + XFASTINT (w->window_end_pos); |
| 9660 | int Z_BYTE_old = MATRIX_ROW_END_BYTEPOS (row) + w->window_end_bytepos; |
| 9661 | int last_unchanged_pos, last_unchanged_pos_old; |
| 9662 | struct glyph_row *first_text_row |
| 9663 | = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9664 | |
| 9665 | *delta = Z - Z_old; |
| 9666 | *delta_bytes = Z_BYTE - Z_BYTE_old; |
| 9667 | |
| 9668 | /* Set last_unchanged_pos to the buffer position of the last |
| 9669 | character in the buffer that has not been changed. Z is the |
| 9670 | index + 1 of the last byte in current_buffer, i.e. by |
| 9671 | subtracting end_unchanged we get the index of the last |
| 9672 | unchanged character, and we have to add BEG to get its buffer |
| 9673 | position. */ |
| 9674 | last_unchanged_pos = Z - END_UNCHANGED + BEG; |
| 9675 | last_unchanged_pos_old = last_unchanged_pos - *delta; |
| 9676 | |
| 9677 | /* Search backward from ROW for a row displaying a line that |
| 9678 | starts at a minimum position >= last_unchanged_pos_old. */ |
| 9679 | while (row >= first_text_row) |
| 9680 | { |
| 9681 | xassert (row->enabled_p); |
| 9682 | xassert (MATRIX_ROW_DISPLAYS_TEXT_P (row)); |
| 9683 | |
| 9684 | if (MATRIX_ROW_START_CHARPOS (row) >= last_unchanged_pos_old) |
| 9685 | row_found = row; |
| 9686 | --row; |
| 9687 | } |
| 9688 | } |
| 9689 | |
| 9690 | xassert (!row_found || MATRIX_ROW_DISPLAYS_TEXT_P (row_found)); |
| 9691 | return row_found; |
| 9692 | } |
| 9693 | |
| 9694 | |
| 9695 | /* Make sure that glyph rows in the current matrix of window W |
| 9696 | reference the same glyph memory as corresponding rows in the |
| 9697 | frame's frame matrix. This function is called after scrolling W's |
| 9698 | current matrix on a terminal frame in try_window_id and |
| 9699 | try_window_reusing_current_matrix. */ |
| 9700 | |
| 9701 | static void |
| 9702 | sync_frame_with_window_matrix_rows (w) |
| 9703 | struct window *w; |
| 9704 | { |
| 9705 | struct frame *f = XFRAME (w->frame); |
| 9706 | struct glyph_row *window_row, *window_row_end, *frame_row; |
| 9707 | |
| 9708 | /* Preconditions: W must be a leaf window and full-width. Its frame |
| 9709 | must have a frame matrix. */ |
| 9710 | xassert (NILP (w->hchild) && NILP (w->vchild)); |
| 9711 | xassert (WINDOW_FULL_WIDTH_P (w)); |
| 9712 | xassert (!FRAME_WINDOW_P (f)); |
| 9713 | |
| 9714 | /* If W is a full-width window, glyph pointers in W's current matrix |
| 9715 | have, by definition, to be the same as glyph pointers in the |
| 9716 | corresponding frame matrix. */ |
| 9717 | window_row = w->current_matrix->rows; |
| 9718 | window_row_end = window_row + w->current_matrix->nrows; |
| 9719 | frame_row = f->current_matrix->rows + XFASTINT (w->top); |
| 9720 | while (window_row < window_row_end) |
| 9721 | { |
| 9722 | int area; |
| 9723 | |
| 9724 | for (area = LEFT_MARGIN_AREA; area <= LAST_AREA; ++area) |
| 9725 | frame_row->glyphs[area] = window_row->glyphs[area]; |
| 9726 | |
| 9727 | /* Disable frame rows whose corresponding window rows have |
| 9728 | been disabled in try_window_id. */ |
| 9729 | if (!window_row->enabled_p) |
| 9730 | frame_row->enabled_p = 0; |
| 9731 | |
| 9732 | ++window_row, ++frame_row; |
| 9733 | } |
| 9734 | } |
| 9735 | |
| 9736 | |
| 9737 | /* Find the glyph row in window W containing CHARPOS. Consider all |
| 9738 | rows between START and END (not inclusive). END null means search |
| 9739 | all rows to the end of the display area of W. Value is the row |
| 9740 | containing CHARPOS or null. */ |
| 9741 | |
| 9742 | static struct glyph_row * |
| 9743 | row_containing_pos (w, charpos, start, end) |
| 9744 | struct window *w; |
| 9745 | int charpos; |
| 9746 | struct glyph_row *start, *end; |
| 9747 | { |
| 9748 | struct glyph_row *row = start; |
| 9749 | int last_y; |
| 9750 | |
| 9751 | /* If we happen to start on a header-line, skip that. */ |
| 9752 | if (row->mode_line_p) |
| 9753 | ++row; |
| 9754 | |
| 9755 | if ((end && row >= end) || !row->enabled_p) |
| 9756 | return NULL; |
| 9757 | |
| 9758 | last_y = window_text_bottom_y (w); |
| 9759 | |
| 9760 | while ((end == NULL || row < end) |
| 9761 | && (MATRIX_ROW_END_CHARPOS (row) < charpos |
| 9762 | /* The end position of a row equals the start |
| 9763 | position of the next row. If CHARPOS is there, we |
| 9764 | would rather display it in the next line, except |
| 9765 | when this line ends in ZV. */ |
| 9766 | || (MATRIX_ROW_END_CHARPOS (row) == charpos |
| 9767 | && (MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row) |
| 9768 | || !row->ends_at_zv_p))) |
| 9769 | && MATRIX_ROW_BOTTOM_Y (row) < last_y) |
| 9770 | ++row; |
| 9771 | |
| 9772 | /* Give up if CHARPOS not found. */ |
| 9773 | if ((end && row >= end) |
| 9774 | || charpos < MATRIX_ROW_START_CHARPOS (row) |
| 9775 | || charpos > MATRIX_ROW_END_CHARPOS (row)) |
| 9776 | row = NULL; |
| 9777 | |
| 9778 | return row; |
| 9779 | } |
| 9780 | |
| 9781 | |
| 9782 | /* Try to redisplay window W by reusing its existing display. W's |
| 9783 | current matrix must be up to date when this function is called, |
| 9784 | i.e. window_end_valid must not be nil. |
| 9785 | |
| 9786 | Value is |
| 9787 | |
| 9788 | 1 if display has been updated |
| 9789 | 0 if otherwise unsuccessful |
| 9790 | -1 if redisplay with same window start is known not to succeed |
| 9791 | |
| 9792 | The following steps are performed: |
| 9793 | |
| 9794 | 1. Find the last row in the current matrix of W that is not |
| 9795 | affected by changes at the start of current_buffer. If no such row |
| 9796 | is found, give up. |
| 9797 | |
| 9798 | 2. Find the first row in W's current matrix that is not affected by |
| 9799 | changes at the end of current_buffer. Maybe there is no such row. |
| 9800 | |
| 9801 | 3. Display lines beginning with the row + 1 found in step 1 to the |
| 9802 | row found in step 2 or, if step 2 didn't find a row, to the end of |
| 9803 | the window. |
| 9804 | |
| 9805 | 4. If cursor is not known to appear on the window, give up. |
| 9806 | |
| 9807 | 5. If display stopped at the row found in step 2, scroll the |
| 9808 | display and current matrix as needed. |
| 9809 | |
| 9810 | 6. Maybe display some lines at the end of W, if we must. This can |
| 9811 | happen under various circumstances, like a partially visible line |
| 9812 | becoming fully visible, or because newly displayed lines are displayed |
| 9813 | in smaller font sizes. |
| 9814 | |
| 9815 | 7. Update W's window end information. */ |
| 9816 | |
| 9817 | /* Check that window end is what we expect it to be. */ |
| 9818 | |
| 9819 | static int |
| 9820 | try_window_id (w) |
| 9821 | struct window *w; |
| 9822 | { |
| 9823 | struct frame *f = XFRAME (w->frame); |
| 9824 | struct glyph_matrix *current_matrix = w->current_matrix; |
| 9825 | struct glyph_matrix *desired_matrix = w->desired_matrix; |
| 9826 | struct glyph_row *last_unchanged_at_beg_row; |
| 9827 | struct glyph_row *first_unchanged_at_end_row; |
| 9828 | struct glyph_row *row; |
| 9829 | struct glyph_row *bottom_row; |
| 9830 | int bottom_vpos; |
| 9831 | struct it it; |
| 9832 | int delta = 0, delta_bytes = 0, stop_pos, dvpos, dy; |
| 9833 | struct text_pos start_pos; |
| 9834 | struct run run; |
| 9835 | int first_unchanged_at_end_vpos = 0; |
| 9836 | struct glyph_row *last_text_row, *last_text_row_at_end; |
| 9837 | struct text_pos start; |
| 9838 | |
| 9839 | SET_TEXT_POS_FROM_MARKER (start, w->start); |
| 9840 | |
| 9841 | /* Check pre-conditions. Window end must be valid, otherwise |
| 9842 | the current matrix would not be up to date. */ |
| 9843 | xassert (!NILP (w->window_end_valid)); |
| 9844 | xassert (FRAME_WINDOW_P (XFRAME (w->frame)) |
| 9845 | || (line_ins_del_ok && WINDOW_FULL_WIDTH_P (w))); |
| 9846 | |
| 9847 | /* Make sure beg_unchanged and end_unchanged are up to date. Do it |
| 9848 | only if buffer has really changed. The reason is that the gap is |
| 9849 | initially at Z for freshly visited files. The code below would |
| 9850 | set end_unchanged to 0 in that case. */ |
| 9851 | if (MODIFF > SAVE_MODIFF) |
| 9852 | { |
| 9853 | if (GPT - BEG < BEG_UNCHANGED) |
| 9854 | BEG_UNCHANGED = GPT - BEG; |
| 9855 | if (Z - GPT < END_UNCHANGED) |
| 9856 | END_UNCHANGED = Z - GPT; |
| 9857 | } |
| 9858 | |
| 9859 | /* If window starts after a line end, and the last change is in |
| 9860 | front of that newline, then changes don't affect the display. |
| 9861 | This case happens with stealth-fontification. */ |
| 9862 | row = MATRIX_ROW (w->current_matrix, XFASTINT (w->window_end_vpos)); |
| 9863 | if (CHARPOS (start) > BEGV |
| 9864 | && Z - END_UNCHANGED < CHARPOS (start) - 1 |
| 9865 | && FETCH_BYTE (BYTEPOS (start) - 1) == '\n' |
| 9866 | && PT < MATRIX_ROW_END_CHARPOS (row)) |
| 9867 | { |
| 9868 | /* We have to update window end positions because the buffer's |
| 9869 | size has changed. */ |
| 9870 | w->window_end_pos |
| 9871 | = make_number (Z - MATRIX_ROW_END_CHARPOS (row)); |
| 9872 | w->window_end_bytepos |
| 9873 | = make_number (Z_BYTE - MATRIX_ROW_END_BYTEPOS (row)); |
| 9874 | return 1; |
| 9875 | } |
| 9876 | |
| 9877 | /* Return quickly if changes are all below what is displayed in the |
| 9878 | window, and if PT is in the window. */ |
| 9879 | if (BEG_UNCHANGED > MATRIX_ROW_END_CHARPOS (row) |
| 9880 | && PT < MATRIX_ROW_END_CHARPOS (row)) |
| 9881 | { |
| 9882 | /* We have to update window end positions because the buffer's |
| 9883 | size has changed. */ |
| 9884 | w->window_end_pos |
| 9885 | = make_number (Z - MATRIX_ROW_END_CHARPOS (row)); |
| 9886 | w->window_end_bytepos |
| 9887 | = make_number (Z_BYTE - MATRIX_ROW_END_BYTEPOS (row)); |
| 9888 | return 1; |
| 9889 | } |
| 9890 | |
| 9891 | /* Check that window start agrees with the start of the first glyph |
| 9892 | row in its current matrix. Check this after we know the window |
| 9893 | start is not in changed text, otherwise positions would not be |
| 9894 | comparable. */ |
| 9895 | row = MATRIX_FIRST_TEXT_ROW (w->current_matrix); |
| 9896 | if (!TEXT_POS_EQUAL_P (start, row->start.pos)) |
| 9897 | return 0; |
| 9898 | |
| 9899 | /* Compute the position at which we have to start displaying new |
| 9900 | lines. Some of the lines at the top of the window might be |
| 9901 | reusable because they are not displaying changed text. Find the |
| 9902 | last row in W's current matrix not affected by changes at the |
| 9903 | start of current_buffer. Value is null if changes start in the |
| 9904 | first line of window. */ |
| 9905 | last_unchanged_at_beg_row = get_last_unchanged_at_beg_row (w); |
| 9906 | if (last_unchanged_at_beg_row) |
| 9907 | { |
| 9908 | init_to_row_end (&it, w, last_unchanged_at_beg_row); |
| 9909 | start_pos = it.current.pos; |
| 9910 | |
| 9911 | /* Start displaying new lines in the desired matrix at the same |
| 9912 | vpos we would use in the current matrix, i.e. below |
| 9913 | last_unchanged_at_beg_row. */ |
| 9914 | it.vpos = 1 + MATRIX_ROW_VPOS (last_unchanged_at_beg_row, |
| 9915 | current_matrix); |
| 9916 | it.glyph_row = MATRIX_ROW (desired_matrix, it.vpos); |
| 9917 | it.current_y = MATRIX_ROW_BOTTOM_Y (last_unchanged_at_beg_row); |
| 9918 | |
| 9919 | xassert (it.hpos == 0 && it.current_x == 0); |
| 9920 | } |
| 9921 | else |
| 9922 | { |
| 9923 | /* There are no reusable lines at the start of the window. |
| 9924 | Start displaying in the first line. */ |
| 9925 | start_display (&it, w, start); |
| 9926 | start_pos = it.current.pos; |
| 9927 | } |
| 9928 | |
| 9929 | /* Find the first row that is not affected by changes at the end of |
| 9930 | the buffer. Value will be null if there is no unchanged row, in |
| 9931 | which case we must redisplay to the end of the window. delta |
| 9932 | will be set to the value by which buffer positions beginning with |
| 9933 | first_unchanged_at_end_row have to be adjusted due to text |
| 9934 | changes. */ |
| 9935 | first_unchanged_at_end_row |
| 9936 | = get_first_unchanged_at_end_row (w, &delta, &delta_bytes); |
| 9937 | IF_DEBUG (debug_delta = delta); |
| 9938 | IF_DEBUG (debug_delta_bytes = delta_bytes); |
| 9939 | |
| 9940 | /* Set stop_pos to the buffer position up to which we will have to |
| 9941 | display new lines. If first_unchanged_at_end_row != NULL, this |
| 9942 | is the buffer position of the start of the line displayed in that |
| 9943 | row. For first_unchanged_at_end_row == NULL, use 0 to indicate |
| 9944 | that we don't stop at a buffer position. */ |
| 9945 | stop_pos = 0; |
| 9946 | if (first_unchanged_at_end_row) |
| 9947 | { |
| 9948 | xassert (last_unchanged_at_beg_row == NULL |
| 9949 | || first_unchanged_at_end_row >= last_unchanged_at_beg_row); |
| 9950 | |
| 9951 | /* If this is a continuation line, move forward to the next one |
| 9952 | that isn't. Changes in lines above affect this line. |
| 9953 | Caution: this may move first_unchanged_at_end_row to a row |
| 9954 | not displaying text. */ |
| 9955 | while (MATRIX_ROW_CONTINUATION_LINE_P (first_unchanged_at_end_row) |
| 9956 | && MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row) |
| 9957 | && (MATRIX_ROW_BOTTOM_Y (first_unchanged_at_end_row) |
| 9958 | < it.last_visible_y)) |
| 9959 | ++first_unchanged_at_end_row; |
| 9960 | |
| 9961 | if (!MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row) |
| 9962 | || (MATRIX_ROW_BOTTOM_Y (first_unchanged_at_end_row) |
| 9963 | >= it.last_visible_y)) |
| 9964 | first_unchanged_at_end_row = NULL; |
| 9965 | else |
| 9966 | { |
| 9967 | stop_pos = (MATRIX_ROW_START_CHARPOS (first_unchanged_at_end_row) |
| 9968 | + delta); |
| 9969 | first_unchanged_at_end_vpos |
| 9970 | = MATRIX_ROW_VPOS (first_unchanged_at_end_row, current_matrix); |
| 9971 | xassert (stop_pos >= Z - END_UNCHANGED); |
| 9972 | } |
| 9973 | } |
| 9974 | else if (last_unchanged_at_beg_row == NULL) |
| 9975 | return 0; |
| 9976 | |
| 9977 | |
| 9978 | #if GLYPH_DEBUG |
| 9979 | |
| 9980 | /* Either there is no unchanged row at the end, or the one we have |
| 9981 | now displays text. This is a necessary condition for the window |
| 9982 | end pos calculation at the end of this function. */ |
| 9983 | xassert (first_unchanged_at_end_row == NULL |
| 9984 | || MATRIX_ROW_DISPLAYS_TEXT_P (first_unchanged_at_end_row)); |
| 9985 | |
| 9986 | debug_last_unchanged_at_beg_vpos |
| 9987 | = (last_unchanged_at_beg_row |
| 9988 | ? MATRIX_ROW_VPOS (last_unchanged_at_beg_row, current_matrix) |
| 9989 | : -1); |
| 9990 | debug_first_unchanged_at_end_vpos = first_unchanged_at_end_vpos; |
| 9991 | |
| 9992 | #endif /* GLYPH_DEBUG != 0 */ |
| 9993 | |
| 9994 | |
| 9995 | /* Display new lines. Set last_text_row to the last new line |
| 9996 | displayed which has text on it, i.e. might end up as being the |
| 9997 | line where the window_end_vpos is. */ |
| 9998 | w->cursor.vpos = -1; |
| 9999 | last_text_row = NULL; |
| 10000 | overlay_arrow_seen = 0; |
| 10001 | while (it.current_y < it.last_visible_y |
| 10002 | && !fonts_changed_p |
| 10003 | && (first_unchanged_at_end_row == NULL |
| 10004 | || IT_CHARPOS (it) < stop_pos)) |
| 10005 | { |
| 10006 | if (display_line (&it)) |
| 10007 | last_text_row = it.glyph_row - 1; |
| 10008 | } |
| 10009 | |
| 10010 | if (fonts_changed_p) |
| 10011 | return -1; |
| 10012 | |
| 10013 | |
| 10014 | /* Compute differences in buffer positions, y-positions etc. for |
| 10015 | lines reused at the bottom of the window. Compute what we can |
| 10016 | scroll. */ |
| 10017 | if (first_unchanged_at_end_row |
| 10018 | /* No lines reused because we displayed everything up to the |
| 10019 | bottom of the window. */ |
| 10020 | && it.current_y < it.last_visible_y) |
| 10021 | { |
| 10022 | dvpos = (it.vpos |
| 10023 | - MATRIX_ROW_VPOS (first_unchanged_at_end_row, |
| 10024 | current_matrix)); |
| 10025 | dy = it.current_y - first_unchanged_at_end_row->y; |
| 10026 | run.current_y = first_unchanged_at_end_row->y; |
| 10027 | run.desired_y = run.current_y + dy; |
| 10028 | run.height = it.last_visible_y - max (run.current_y, run.desired_y); |
| 10029 | } |
| 10030 | else |
| 10031 | { |
| 10032 | delta = dvpos = dy = run.current_y = run.desired_y = run.height = 0; |
| 10033 | first_unchanged_at_end_row = NULL; |
| 10034 | } |
| 10035 | IF_DEBUG (debug_dvpos = dvpos; debug_dy = dy); |
| 10036 | |
| 10037 | |
| 10038 | /* Find the cursor if not already found. We have to decide whether |
| 10039 | PT will appear on this window (it sometimes doesn't, but this is |
| 10040 | not a very frequent case.) This decision has to be made before |
| 10041 | the current matrix is altered. A value of cursor.vpos < 0 means |
| 10042 | that PT is either in one of the lines beginning at |
| 10043 | first_unchanged_at_end_row or below the window. Don't care for |
| 10044 | lines that might be displayed later at the window end; as |
| 10045 | mentioned, this is not a frequent case. */ |
| 10046 | if (w->cursor.vpos < 0) |
| 10047 | { |
| 10048 | /* Cursor in unchanged rows at the top? */ |
| 10049 | if (PT < CHARPOS (start_pos) |
| 10050 | && last_unchanged_at_beg_row) |
| 10051 | { |
| 10052 | row = row_containing_pos (w, PT, |
| 10053 | MATRIX_FIRST_TEXT_ROW (w->current_matrix), |
| 10054 | last_unchanged_at_beg_row + 1); |
| 10055 | xassert (row && row <= last_unchanged_at_beg_row); |
| 10056 | set_cursor_from_row (w, row, w->current_matrix, 0, 0, 0, 0); |
| 10057 | } |
| 10058 | |
| 10059 | /* Start from first_unchanged_at_end_row looking for PT. */ |
| 10060 | else if (first_unchanged_at_end_row) |
| 10061 | { |
| 10062 | row = row_containing_pos (w, PT - delta, |
| 10063 | first_unchanged_at_end_row, NULL); |
| 10064 | if (row) |
| 10065 | set_cursor_from_row (w, row, w->current_matrix, delta, |
| 10066 | delta_bytes, dy, dvpos); |
| 10067 | } |
| 10068 | |
| 10069 | /* Give up if cursor was not found. */ |
| 10070 | if (w->cursor.vpos < 0) |
| 10071 | { |
| 10072 | clear_glyph_matrix (w->desired_matrix); |
| 10073 | return -1; |
| 10074 | } |
| 10075 | } |
| 10076 | |
| 10077 | /* Don't let the cursor end in the scroll margins. */ |
| 10078 | { |
| 10079 | int this_scroll_margin, cursor_height; |
| 10080 | |
| 10081 | this_scroll_margin = max (0, scroll_margin); |
| 10082 | this_scroll_margin = min (this_scroll_margin, |
| 10083 | XFASTINT (w->height) / 4); |
| 10084 | this_scroll_margin *= CANON_Y_UNIT (it.f); |
| 10085 | cursor_height = MATRIX_ROW (w->desired_matrix, w->cursor.vpos)->height; |
| 10086 | |
| 10087 | if ((w->cursor.y < this_scroll_margin |
| 10088 | && CHARPOS (start) > BEGV) |
| 10089 | /* Don't take scroll margin into account at the bottom because |
| 10090 | old redisplay didn't do it either. */ |
| 10091 | || w->cursor.y + cursor_height > it.last_visible_y) |
| 10092 | { |
| 10093 | w->cursor.vpos = -1; |
| 10094 | clear_glyph_matrix (w->desired_matrix); |
| 10095 | return -1; |
| 10096 | } |
| 10097 | } |
| 10098 | |
| 10099 | /* Scroll the display. Do it before changing the current matrix so |
| 10100 | that xterm.c doesn't get confused about where the cursor glyph is |
| 10101 | found. */ |
| 10102 | if (dy) |
| 10103 | { |
| 10104 | update_begin (f); |
| 10105 | |
| 10106 | if (FRAME_WINDOW_P (f)) |
| 10107 | { |
| 10108 | rif->update_window_begin_hook (w); |
| 10109 | rif->scroll_run_hook (w, &run); |
| 10110 | rif->update_window_end_hook (w, 0); |
| 10111 | } |
| 10112 | else |
| 10113 | { |
| 10114 | /* Terminal frame. In this case, dvpos gives the number of |
| 10115 | lines to scroll by; dvpos < 0 means scroll up. */ |
| 10116 | int first_unchanged_at_end_vpos |
| 10117 | = MATRIX_ROW_VPOS (first_unchanged_at_end_row, w->current_matrix); |
| 10118 | int from = XFASTINT (w->top) + first_unchanged_at_end_vpos; |
| 10119 | int end = XFASTINT (w->top) + window_internal_height (w); |
| 10120 | |
| 10121 | /* Perform the operation on the screen. */ |
| 10122 | if (dvpos > 0) |
| 10123 | { |
| 10124 | /* Scroll last_unchanged_at_beg_row to the end of the |
| 10125 | window down dvpos lines. */ |
| 10126 | set_terminal_window (end); |
| 10127 | |
| 10128 | /* On dumb terminals delete dvpos lines at the end |
| 10129 | before inserting dvpos empty lines. */ |
| 10130 | if (!scroll_region_ok) |
| 10131 | ins_del_lines (end - dvpos, -dvpos); |
| 10132 | |
| 10133 | /* Insert dvpos empty lines in front of |
| 10134 | last_unchanged_at_beg_row. */ |
| 10135 | ins_del_lines (from, dvpos); |
| 10136 | } |
| 10137 | else if (dvpos < 0) |
| 10138 | { |
| 10139 | /* Scroll up last_unchanged_at_beg_vpos to the end of |
| 10140 | the window to last_unchanged_at_beg_vpos - |dvpos|. */ |
| 10141 | set_terminal_window (end); |
| 10142 | |
| 10143 | /* Delete dvpos lines in front of |
| 10144 | last_unchanged_at_beg_vpos. ins_del_lines will set |
| 10145 | the cursor to the given vpos and emit |dvpos| delete |
| 10146 | line sequences. */ |
| 10147 | ins_del_lines (from + dvpos, dvpos); |
| 10148 | |
| 10149 | /* On a dumb terminal insert dvpos empty lines at the |
| 10150 | end. */ |
| 10151 | if (!scroll_region_ok) |
| 10152 | ins_del_lines (end + dvpos, -dvpos); |
| 10153 | } |
| 10154 | |
| 10155 | set_terminal_window (0); |
| 10156 | } |
| 10157 | |
| 10158 | update_end (f); |
| 10159 | } |
| 10160 | |
| 10161 | /* Shift reused rows of the current matrix to the right position. |
| 10162 | BOTTOM_ROW is the last + 1 row in the current matrix reserved for |
| 10163 | text. */ |
| 10164 | bottom_row = MATRIX_BOTTOM_TEXT_ROW (current_matrix, w); |
| 10165 | bottom_vpos = MATRIX_ROW_VPOS (bottom_row, current_matrix); |
| 10166 | if (dvpos < 0) |
| 10167 | { |
| 10168 | rotate_matrix (current_matrix, first_unchanged_at_end_vpos + dvpos, |
| 10169 | bottom_vpos, dvpos); |
| 10170 | enable_glyph_matrix_rows (current_matrix, bottom_vpos + dvpos, |
| 10171 | bottom_vpos, 0); |
| 10172 | } |
| 10173 | else if (dvpos > 0) |
| 10174 | { |
| 10175 | rotate_matrix (current_matrix, first_unchanged_at_end_vpos, |
| 10176 | bottom_vpos, dvpos); |
| 10177 | enable_glyph_matrix_rows (current_matrix, first_unchanged_at_end_vpos, |
| 10178 | first_unchanged_at_end_vpos + dvpos, 0); |
| 10179 | } |
| 10180 | |
| 10181 | /* For frame-based redisplay, make sure that current frame and window |
| 10182 | matrix are in sync with respect to glyph memory. */ |
| 10183 | if (!FRAME_WINDOW_P (f)) |
| 10184 | sync_frame_with_window_matrix_rows (w); |
| 10185 | |
| 10186 | /* Adjust buffer positions in reused rows. */ |
| 10187 | if (delta) |
| 10188 | increment_glyph_matrix_buffer_positions (current_matrix, |
| 10189 | first_unchanged_at_end_vpos + dvpos, |
| 10190 | bottom_vpos, delta, delta_bytes); |
| 10191 | |
| 10192 | /* Adjust Y positions. */ |
| 10193 | if (dy) |
| 10194 | shift_glyph_matrix (w, current_matrix, |
| 10195 | first_unchanged_at_end_vpos + dvpos, |
| 10196 | bottom_vpos, dy); |
| 10197 | |
| 10198 | if (first_unchanged_at_end_row) |
| 10199 | first_unchanged_at_end_row += dvpos; |
| 10200 | |
| 10201 | /* If scrolling up, there may be some lines to display at the end of |
| 10202 | the window. */ |
| 10203 | last_text_row_at_end = NULL; |
| 10204 | if (dy < 0) |
| 10205 | { |
| 10206 | /* Set last_row to the glyph row in the current matrix where the |
| 10207 | window end line is found. It has been moved up or down in |
| 10208 | the matrix by dvpos. */ |
| 10209 | int last_vpos = XFASTINT (w->window_end_vpos) + dvpos; |
| 10210 | struct glyph_row *last_row = MATRIX_ROW (current_matrix, last_vpos); |
| 10211 | |
| 10212 | /* If last_row is the window end line, it should display text. */ |
| 10213 | xassert (last_row->displays_text_p); |
| 10214 | |
| 10215 | /* If window end line was partially visible before, begin |
| 10216 | displaying at that line. Otherwise begin displaying with the |
| 10217 | line following it. */ |
| 10218 | if (MATRIX_ROW_BOTTOM_Y (last_row) - dy >= it.last_visible_y) |
| 10219 | { |
| 10220 | init_to_row_start (&it, w, last_row); |
| 10221 | it.vpos = last_vpos; |
| 10222 | it.current_y = last_row->y; |
| 10223 | } |
| 10224 | else |
| 10225 | { |
| 10226 | init_to_row_end (&it, w, last_row); |
| 10227 | it.vpos = 1 + last_vpos; |
| 10228 | it.current_y = MATRIX_ROW_BOTTOM_Y (last_row); |
| 10229 | ++last_row; |
| 10230 | } |
| 10231 | |
| 10232 | /* We may start in a continuation line. If so, we have to get |
| 10233 | the right continuation_lines_width and current_x. */ |
| 10234 | it.continuation_lines_width = last_row->continuation_lines_width; |
| 10235 | it.hpos = it.current_x = 0; |
| 10236 | |
| 10237 | /* Display the rest of the lines at the window end. */ |
| 10238 | it.glyph_row = MATRIX_ROW (desired_matrix, it.vpos); |
| 10239 | while (it.current_y < it.last_visible_y |
| 10240 | && !fonts_changed_p) |
| 10241 | { |
| 10242 | /* Is it always sure that the display agrees with lines in |
| 10243 | the current matrix? I don't think so, so we mark rows |
| 10244 | displayed invalid in the current matrix by setting their |
| 10245 | enabled_p flag to zero. */ |
| 10246 | MATRIX_ROW (w->current_matrix, it.vpos)->enabled_p = 0; |
| 10247 | if (display_line (&it)) |
| 10248 | last_text_row_at_end = it.glyph_row - 1; |
| 10249 | } |
| 10250 | } |
| 10251 | |
| 10252 | /* Update window_end_pos and window_end_vpos. */ |
| 10253 | if (first_unchanged_at_end_row |
| 10254 | && first_unchanged_at_end_row->y < it.last_visible_y |
| 10255 | && !last_text_row_at_end) |
| 10256 | { |
| 10257 | /* Window end line if one of the preserved rows from the current |
| 10258 | matrix. Set row to the last row displaying text in current |
| 10259 | matrix starting at first_unchanged_at_end_row, after |
| 10260 | scrolling. */ |
| 10261 | xassert (first_unchanged_at_end_row->displays_text_p); |
| 10262 | row = find_last_row_displaying_text (w->current_matrix, &it, |
| 10263 | first_unchanged_at_end_row); |
| 10264 | xassert (row && MATRIX_ROW_DISPLAYS_TEXT_P (row)); |
| 10265 | |
| 10266 | XSETFASTINT (w->window_end_pos, Z - MATRIX_ROW_END_CHARPOS (row)); |
| 10267 | w->window_end_bytepos = Z_BYTE - MATRIX_ROW_END_BYTEPOS (row); |
| 10268 | XSETFASTINT (w->window_end_vpos, |
| 10269 | MATRIX_ROW_VPOS (row, w->current_matrix)); |
| 10270 | } |
| 10271 | else if (last_text_row_at_end) |
| 10272 | { |
| 10273 | XSETFASTINT (w->window_end_pos, |
| 10274 | Z - MATRIX_ROW_END_CHARPOS (last_text_row_at_end)); |
| 10275 | w->window_end_bytepos |
| 10276 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row_at_end); |
| 10277 | XSETFASTINT (w->window_end_vpos, |
| 10278 | MATRIX_ROW_VPOS (last_text_row_at_end, desired_matrix)); |
| 10279 | } |
| 10280 | else if (last_text_row) |
| 10281 | { |
| 10282 | /* We have displayed either to the end of the window or at the |
| 10283 | end of the window, i.e. the last row with text is to be found |
| 10284 | in the desired matrix. */ |
| 10285 | XSETFASTINT (w->window_end_pos, |
| 10286 | Z - MATRIX_ROW_END_CHARPOS (last_text_row)); |
| 10287 | w->window_end_bytepos |
| 10288 | = Z_BYTE - MATRIX_ROW_END_BYTEPOS (last_text_row); |
| 10289 | XSETFASTINT (w->window_end_vpos, |
| 10290 | MATRIX_ROW_VPOS (last_text_row, desired_matrix)); |
| 10291 | } |
| 10292 | else if (first_unchanged_at_end_row == NULL |
| 10293 | && last_text_row == NULL |
| 10294 | && last_text_row_at_end == NULL) |
| 10295 | { |
| 10296 | /* Displayed to end of window, but no line containing text was |
| 10297 | displayed. Lines were deleted at the end of the window. */ |
| 10298 | int vpos; |
| 10299 | int header_line_p = WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0; |
| 10300 | |
| 10301 | for (vpos = XFASTINT (w->window_end_vpos); vpos > 0; --vpos) |
| 10302 | if ((w->desired_matrix->rows[vpos + header_line_p].enabled_p |
| 10303 | && w->desired_matrix->rows[vpos + header_line_p].displays_text_p) |
| 10304 | || (!w->desired_matrix->rows[vpos + header_line_p].enabled_p |
| 10305 | && w->current_matrix->rows[vpos + header_line_p].displays_text_p)) |
| 10306 | break; |
| 10307 | |
| 10308 | w->window_end_vpos = make_number (vpos); |
| 10309 | } |
| 10310 | else |
| 10311 | abort (); |
| 10312 | |
| 10313 | IF_DEBUG (debug_end_pos = XFASTINT (w->window_end_pos); |
| 10314 | debug_end_vpos = XFASTINT (w->window_end_vpos)); |
| 10315 | |
| 10316 | /* Record that display has not been completed. */ |
| 10317 | w->window_end_valid = Qnil; |
| 10318 | w->desired_matrix->no_scrolling_p = 1; |
| 10319 | return 1; |
| 10320 | } |
| 10321 | |
| 10322 | |
| 10323 | \f |
| 10324 | /*********************************************************************** |
| 10325 | More debugging support |
| 10326 | ***********************************************************************/ |
| 10327 | |
| 10328 | #if GLYPH_DEBUG |
| 10329 | |
| 10330 | void dump_glyph_row P_ ((struct glyph_matrix *, int, int)); |
| 10331 | static void dump_glyph_matrix P_ ((struct glyph_matrix *, int)); |
| 10332 | |
| 10333 | |
| 10334 | /* Dump the contents of glyph matrix MATRIX on stderr. If |
| 10335 | WITH_GLYPHS_P is non-zero, dump glyph contents as well. */ |
| 10336 | |
| 10337 | void |
| 10338 | dump_glyph_matrix (matrix, with_glyphs_p) |
| 10339 | struct glyph_matrix *matrix; |
| 10340 | int with_glyphs_p; |
| 10341 | { |
| 10342 | int i; |
| 10343 | for (i = 0; i < matrix->nrows; ++i) |
| 10344 | dump_glyph_row (matrix, i, with_glyphs_p); |
| 10345 | } |
| 10346 | |
| 10347 | |
| 10348 | /* Dump the contents of glyph row at VPOS in MATRIX to stderr. |
| 10349 | WITH_GLYPH_SP non-zero means dump glyph contents, too. */ |
| 10350 | |
| 10351 | void |
| 10352 | dump_glyph_row (matrix, vpos, with_glyphs_p) |
| 10353 | struct glyph_matrix *matrix; |
| 10354 | int vpos, with_glyphs_p; |
| 10355 | { |
| 10356 | struct glyph_row *row; |
| 10357 | |
| 10358 | if (vpos < 0 || vpos >= matrix->nrows) |
| 10359 | return; |
| 10360 | |
| 10361 | row = MATRIX_ROW (matrix, vpos); |
| 10362 | |
| 10363 | fprintf (stderr, "Row Start End Used oEI><O\\CTZF X Y W\n"); |
| 10364 | fprintf (stderr, "=============================================\n"); |
| 10365 | |
| 10366 | fprintf (stderr, "%3d %5d %5d %4d %1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d%1.1d %4d %4d %4d\n", |
| 10367 | row - matrix->rows, |
| 10368 | MATRIX_ROW_START_CHARPOS (row), |
| 10369 | MATRIX_ROW_END_CHARPOS (row), |
| 10370 | row->used[TEXT_AREA], |
| 10371 | row->contains_overlapping_glyphs_p, |
| 10372 | row->enabled_p, |
| 10373 | row->inverse_p, |
| 10374 | row->truncated_on_left_p, |
| 10375 | row->truncated_on_right_p, |
| 10376 | row->overlay_arrow_p, |
| 10377 | row->continued_p, |
| 10378 | MATRIX_ROW_CONTINUATION_LINE_P (row), |
| 10379 | row->displays_text_p, |
| 10380 | row->ends_at_zv_p, |
| 10381 | row->fill_line_p, |
| 10382 | row->x, |
| 10383 | row->y, |
| 10384 | row->pixel_width); |
| 10385 | fprintf (stderr, "%9d %5d\n", row->start.overlay_string_index, |
| 10386 | row->end.overlay_string_index); |
| 10387 | fprintf (stderr, "%9d %5d\n", |
| 10388 | CHARPOS (row->start.string_pos), |
| 10389 | CHARPOS (row->end.string_pos)); |
| 10390 | fprintf (stderr, "%9d %5d\n", row->start.dpvec_index, |
| 10391 | row->end.dpvec_index); |
| 10392 | |
| 10393 | if (with_glyphs_p) |
| 10394 | { |
| 10395 | struct glyph *glyph, *glyph_end; |
| 10396 | int prev_had_glyphs_p; |
| 10397 | |
| 10398 | glyph = row->glyphs[TEXT_AREA]; |
| 10399 | glyph_end = glyph + row->used[TEXT_AREA]; |
| 10400 | |
| 10401 | /* Glyph for a line end in text. */ |
| 10402 | if (glyph == glyph_end && glyph->charpos > 0) |
| 10403 | ++glyph_end; |
| 10404 | |
| 10405 | if (glyph < glyph_end) |
| 10406 | { |
| 10407 | fprintf (stderr, " Glyph Type Pos W Code C Face LR\n"); |
| 10408 | prev_had_glyphs_p = 1; |
| 10409 | } |
| 10410 | else |
| 10411 | prev_had_glyphs_p = 0; |
| 10412 | |
| 10413 | while (glyph < glyph_end) |
| 10414 | { |
| 10415 | if (glyph->type == CHAR_GLYPH) |
| 10416 | { |
| 10417 | fprintf (stderr, |
| 10418 | " %5d %4c %6d %3d 0x%05x %c %4d %1.1d%1.1d\n", |
| 10419 | glyph - row->glyphs[TEXT_AREA], |
| 10420 | 'C', |
| 10421 | glyph->charpos, |
| 10422 | glyph->pixel_width, |
| 10423 | glyph->u.ch.code, |
| 10424 | (glyph->u.ch.code < 0x80 && glyph->u.ch.code >= ' ' |
| 10425 | ? glyph->u.ch.code |
| 10426 | : '.'), |
| 10427 | glyph->u.ch.face_id, |
| 10428 | glyph->left_box_line_p, |
| 10429 | glyph->right_box_line_p); |
| 10430 | } |
| 10431 | else if (glyph->type == STRETCH_GLYPH) |
| 10432 | { |
| 10433 | fprintf (stderr, |
| 10434 | " %5d %4c %6d %3d 0x%05x %c %4d %1.1d%1.1d\n", |
| 10435 | glyph - row->glyphs[TEXT_AREA], |
| 10436 | 'S', |
| 10437 | glyph->charpos, |
| 10438 | glyph->pixel_width, |
| 10439 | 0, |
| 10440 | '.', |
| 10441 | glyph->u.stretch.face_id, |
| 10442 | glyph->left_box_line_p, |
| 10443 | glyph->right_box_line_p); |
| 10444 | } |
| 10445 | else if (glyph->type == IMAGE_GLYPH) |
| 10446 | { |
| 10447 | fprintf (stderr, |
| 10448 | " %5d %4c %6d %3d 0x%05x %c %4d %1.1d%1.1d\n", |
| 10449 | glyph - row->glyphs[TEXT_AREA], |
| 10450 | 'I', |
| 10451 | glyph->charpos, |
| 10452 | glyph->pixel_width, |
| 10453 | glyph->u.img.id, |
| 10454 | '.', |
| 10455 | glyph->u.img.face_id, |
| 10456 | glyph->left_box_line_p, |
| 10457 | glyph->right_box_line_p); |
| 10458 | } |
| 10459 | ++glyph; |
| 10460 | } |
| 10461 | } |
| 10462 | } |
| 10463 | |
| 10464 | |
| 10465 | DEFUN ("dump-glyph-matrix", Fdump_glyph_matrix, |
| 10466 | Sdump_glyph_matrix, 0, 1, "p", |
| 10467 | "Dump the current matrix of the selected window to stderr.\n\ |
| 10468 | Shows contents of glyph row structures. With non-nil optional\n\ |
| 10469 | parameter WITH-GLYPHS-P, dump glyphs as well.") |
| 10470 | (with_glyphs_p) |
| 10471 | { |
| 10472 | struct window *w = XWINDOW (selected_window); |
| 10473 | struct buffer *buffer = XBUFFER (w->buffer); |
| 10474 | |
| 10475 | fprintf (stderr, "PT = %d, BEGV = %d. ZV = %d\n", |
| 10476 | BUF_PT (buffer), BUF_BEGV (buffer), BUF_ZV (buffer)); |
| 10477 | fprintf (stderr, "Cursor x = %d, y = %d, hpos = %d, vpos = %d\n", |
| 10478 | w->cursor.x, w->cursor.y, w->cursor.hpos, w->cursor.vpos); |
| 10479 | fprintf (stderr, "=============================================\n"); |
| 10480 | dump_glyph_matrix (w->current_matrix, !NILP (with_glyphs_p)); |
| 10481 | return Qnil; |
| 10482 | } |
| 10483 | |
| 10484 | |
| 10485 | DEFUN ("dump-glyph-row", Fdump_glyph_row, Sdump_glyph_row, 1, 1, "", |
| 10486 | "Dump glyph row ROW to stderr.") |
| 10487 | (row) |
| 10488 | Lisp_Object row; |
| 10489 | { |
| 10490 | CHECK_NUMBER (row, 0); |
| 10491 | dump_glyph_row (XWINDOW (selected_window)->current_matrix, XINT (row), 1); |
| 10492 | return Qnil; |
| 10493 | } |
| 10494 | |
| 10495 | |
| 10496 | DEFUN ("dump-tool-bar-row", Fdump_tool_bar_row, Sdump_tool_bar_row, |
| 10497 | 0, 0, "", "") |
| 10498 | () |
| 10499 | { |
| 10500 | struct frame *sf = SELECTED_FRAME (); |
| 10501 | struct glyph_matrix *m = (XWINDOW (sf->tool_bar_window) |
| 10502 | ->current_matrix); |
| 10503 | dump_glyph_row (m, 0, 1); |
| 10504 | return Qnil; |
| 10505 | } |
| 10506 | |
| 10507 | |
| 10508 | DEFUN ("trace-redisplay-toggle", Ftrace_redisplay_toggle, |
| 10509 | Strace_redisplay_toggle, 0, 0, "", |
| 10510 | "Toggle tracing of redisplay.") |
| 10511 | () |
| 10512 | { |
| 10513 | trace_redisplay_p = !trace_redisplay_p; |
| 10514 | return Qnil; |
| 10515 | } |
| 10516 | |
| 10517 | |
| 10518 | #endif /* GLYPH_DEBUG */ |
| 10519 | |
| 10520 | |
| 10521 | \f |
| 10522 | /*********************************************************************** |
| 10523 | Building Desired Matrix Rows |
| 10524 | ***********************************************************************/ |
| 10525 | |
| 10526 | /* Return a temporary glyph row holding the glyphs of an overlay |
| 10527 | arrow. Only used for non-window-redisplay windows. */ |
| 10528 | |
| 10529 | static struct glyph_row * |
| 10530 | get_overlay_arrow_glyph_row (w) |
| 10531 | struct window *w; |
| 10532 | { |
| 10533 | struct frame *f = XFRAME (WINDOW_FRAME (w)); |
| 10534 | struct buffer *buffer = XBUFFER (w->buffer); |
| 10535 | struct buffer *old = current_buffer; |
| 10536 | unsigned char *arrow_string = XSTRING (Voverlay_arrow_string)->data; |
| 10537 | int arrow_len = XSTRING (Voverlay_arrow_string)->size; |
| 10538 | unsigned char *arrow_end = arrow_string + arrow_len; |
| 10539 | unsigned char *p; |
| 10540 | struct it it; |
| 10541 | int multibyte_p; |
| 10542 | int n_glyphs_before; |
| 10543 | |
| 10544 | set_buffer_temp (buffer); |
| 10545 | init_iterator (&it, w, -1, -1, &scratch_glyph_row, DEFAULT_FACE_ID); |
| 10546 | it.glyph_row->used[TEXT_AREA] = 0; |
| 10547 | SET_TEXT_POS (it.position, 0, 0); |
| 10548 | |
| 10549 | multibyte_p = !NILP (buffer->enable_multibyte_characters); |
| 10550 | p = arrow_string; |
| 10551 | while (p < arrow_end) |
| 10552 | { |
| 10553 | Lisp_Object face, ilisp; |
| 10554 | |
| 10555 | /* Get the next character. */ |
| 10556 | if (multibyte_p) |
| 10557 | it.c = string_char_and_length (p, arrow_len, &it.len); |
| 10558 | else |
| 10559 | it.c = *p, it.len = 1; |
| 10560 | p += it.len; |
| 10561 | |
| 10562 | /* Get its face. */ |
| 10563 | XSETFASTINT (ilisp, p - arrow_string); |
| 10564 | face = Fget_text_property (ilisp, Qface, Voverlay_arrow_string); |
| 10565 | it.face_id = compute_char_face (f, it.c, face); |
| 10566 | |
| 10567 | /* Compute its width, get its glyphs. */ |
| 10568 | n_glyphs_before = it.glyph_row->used[TEXT_AREA]; |
| 10569 | SET_TEXT_POS (it.position, -1, -1); |
| 10570 | PRODUCE_GLYPHS (&it); |
| 10571 | |
| 10572 | /* If this character doesn't fit any more in the line, we have |
| 10573 | to remove some glyphs. */ |
| 10574 | if (it.current_x > it.last_visible_x) |
| 10575 | { |
| 10576 | it.glyph_row->used[TEXT_AREA] = n_glyphs_before; |
| 10577 | break; |
| 10578 | } |
| 10579 | } |
| 10580 | |
| 10581 | set_buffer_temp (old); |
| 10582 | return it.glyph_row; |
| 10583 | } |
| 10584 | |
| 10585 | |
| 10586 | /* Insert truncation glyphs at the start of IT->glyph_row. Truncation |
| 10587 | glyphs are only inserted for terminal frames since we can't really |
| 10588 | win with truncation glyphs when partially visible glyphs are |
| 10589 | involved. Which glyphs to insert is determined by |
| 10590 | produce_special_glyphs. */ |
| 10591 | |
| 10592 | static void |
| 10593 | insert_left_trunc_glyphs (it) |
| 10594 | struct it *it; |
| 10595 | { |
| 10596 | struct it truncate_it; |
| 10597 | struct glyph *from, *end, *to, *toend; |
| 10598 | |
| 10599 | xassert (!FRAME_WINDOW_P (it->f)); |
| 10600 | |
| 10601 | /* Get the truncation glyphs. */ |
| 10602 | truncate_it = *it; |
| 10603 | truncate_it.charset = -1; |
| 10604 | truncate_it.current_x = 0; |
| 10605 | truncate_it.face_id = DEFAULT_FACE_ID; |
| 10606 | truncate_it.glyph_row = &scratch_glyph_row; |
| 10607 | truncate_it.glyph_row->used[TEXT_AREA] = 0; |
| 10608 | CHARPOS (truncate_it.position) = BYTEPOS (truncate_it.position) = -1; |
| 10609 | truncate_it.object = 0; |
| 10610 | produce_special_glyphs (&truncate_it, IT_TRUNCATION); |
| 10611 | |
| 10612 | /* Overwrite glyphs from IT with truncation glyphs. */ |
| 10613 | from = truncate_it.glyph_row->glyphs[TEXT_AREA]; |
| 10614 | end = from + truncate_it.glyph_row->used[TEXT_AREA]; |
| 10615 | to = it->glyph_row->glyphs[TEXT_AREA]; |
| 10616 | toend = to + it->glyph_row->used[TEXT_AREA]; |
| 10617 | |
| 10618 | while (from < end) |
| 10619 | *to++ = *from++; |
| 10620 | |
| 10621 | /* There may be padding glyphs left over. Remove them. */ |
| 10622 | from = to; |
| 10623 | while (from < toend && CHAR_GLYPH_PADDING_P (*from)) |
| 10624 | ++from; |
| 10625 | while (from < toend) |
| 10626 | *to++ = *from++; |
| 10627 | |
| 10628 | it->glyph_row->used[TEXT_AREA] = to - it->glyph_row->glyphs[TEXT_AREA]; |
| 10629 | } |
| 10630 | |
| 10631 | |
| 10632 | /* Compute the pixel height and width of IT->glyph_row. |
| 10633 | |
| 10634 | Most of the time, ascent and height of a display line will be equal |
| 10635 | to the max_ascent and max_height values of the display iterator |
| 10636 | structure. This is not the case if |
| 10637 | |
| 10638 | 1. We hit ZV without displaying anything. In this case, max_ascent |
| 10639 | and max_height will be zero. |
| 10640 | |
| 10641 | 2. We have some glyphs that don't contribute to the line height. |
| 10642 | (The glyph row flag contributes_to_line_height_p is for future |
| 10643 | pixmap extensions). |
| 10644 | |
| 10645 | The first case is easily covered by using default values because in |
| 10646 | these cases, the line height does not really matter, except that it |
| 10647 | must not be zero. */ |
| 10648 | |
| 10649 | static void |
| 10650 | compute_line_metrics (it) |
| 10651 | struct it *it; |
| 10652 | { |
| 10653 | struct glyph_row *row = it->glyph_row; |
| 10654 | int area, i; |
| 10655 | |
| 10656 | if (FRAME_WINDOW_P (it->f)) |
| 10657 | { |
| 10658 | int i, header_line_height; |
| 10659 | |
| 10660 | /* The line may consist of one space only, that was added to |
| 10661 | place the cursor on it. If so, the row's height hasn't been |
| 10662 | computed yet. */ |
| 10663 | if (row->height == 0) |
| 10664 | { |
| 10665 | if (it->max_ascent + it->max_descent == 0) |
| 10666 | it->max_descent = it->max_phys_descent = CANON_Y_UNIT (it->f); |
| 10667 | row->ascent = it->max_ascent; |
| 10668 | row->height = it->max_ascent + it->max_descent; |
| 10669 | row->phys_ascent = it->max_phys_ascent; |
| 10670 | row->phys_height = it->max_phys_ascent + it->max_phys_descent; |
| 10671 | } |
| 10672 | |
| 10673 | /* Compute the width of this line. */ |
| 10674 | row->pixel_width = row->x; |
| 10675 | for (i = 0; i < row->used[TEXT_AREA]; ++i) |
| 10676 | row->pixel_width += row->glyphs[TEXT_AREA][i].pixel_width; |
| 10677 | |
| 10678 | xassert (row->pixel_width >= 0); |
| 10679 | xassert (row->ascent >= 0 && row->height > 0); |
| 10680 | |
| 10681 | row->overlapping_p = (MATRIX_ROW_OVERLAPS_SUCC_P (row) |
| 10682 | || MATRIX_ROW_OVERLAPS_PRED_P (row)); |
| 10683 | |
| 10684 | /* If first line's physical ascent is larger than its logical |
| 10685 | ascent, use the physical ascent, and make the row taller. |
| 10686 | This makes accented characters fully visible. */ |
| 10687 | if (row == it->w->desired_matrix->rows |
| 10688 | && row->phys_ascent > row->ascent) |
| 10689 | { |
| 10690 | row->height += row->phys_ascent - row->ascent; |
| 10691 | row->ascent = row->phys_ascent; |
| 10692 | } |
| 10693 | |
| 10694 | /* Compute how much of the line is visible. */ |
| 10695 | row->visible_height = row->height; |
| 10696 | |
| 10697 | header_line_height = WINDOW_DISPLAY_HEADER_LINE_HEIGHT (it->w); |
| 10698 | if (row->y < header_line_height) |
| 10699 | row->visible_height -= header_line_height - row->y; |
| 10700 | else |
| 10701 | { |
| 10702 | int max_y = WINDOW_DISPLAY_HEIGHT_NO_MODE_LINE (it->w); |
| 10703 | if (row->y + row->height > max_y) |
| 10704 | row->visible_height -= row->y + row->height - max_y; |
| 10705 | } |
| 10706 | } |
| 10707 | else |
| 10708 | { |
| 10709 | row->pixel_width = row->used[TEXT_AREA]; |
| 10710 | row->ascent = row->phys_ascent = 0; |
| 10711 | row->height = row->phys_height = row->visible_height = 1; |
| 10712 | } |
| 10713 | |
| 10714 | /* Compute a hash code for this row. */ |
| 10715 | row->hash = 0; |
| 10716 | for (area = LEFT_MARGIN_AREA; area < LAST_AREA; ++area) |
| 10717 | for (i = 0; i < row->used[area]; ++i) |
| 10718 | row->hash = ((((row->hash << 4) + (row->hash >> 24)) & 0x0fffffff) |
| 10719 | + row->glyphs[area][i].u.val |
| 10720 | + (row->glyphs[area][i].type << 2)); |
| 10721 | |
| 10722 | it->max_ascent = it->max_descent = 0; |
| 10723 | it->max_phys_ascent = it->max_phys_descent = 0; |
| 10724 | } |
| 10725 | |
| 10726 | |
| 10727 | /* Append one space to the glyph row of iterator IT if doing a |
| 10728 | window-based redisplay. DEFAULT_FACE_P non-zero means let the |
| 10729 | space have the default face, otherwise let it have the same face as |
| 10730 | IT->face_id. |
| 10731 | |
| 10732 | This function is called to make sure that there is always one glyph |
| 10733 | at the end of a glyph row that the cursor can be set on under |
| 10734 | window-systems. (If there weren't such a glyph we would not know |
| 10735 | how wide and tall a box cursor should be displayed). |
| 10736 | |
| 10737 | At the same time this space let's a nicely handle clearing to the |
| 10738 | end of the line if the row ends in italic text. */ |
| 10739 | |
| 10740 | static void |
| 10741 | append_space (it, default_face_p) |
| 10742 | struct it *it; |
| 10743 | int default_face_p; |
| 10744 | { |
| 10745 | if (FRAME_WINDOW_P (it->f)) |
| 10746 | { |
| 10747 | int n = it->glyph_row->used[TEXT_AREA]; |
| 10748 | |
| 10749 | if (it->glyph_row->glyphs[TEXT_AREA] + n |
| 10750 | < it->glyph_row->glyphs[1 + TEXT_AREA]) |
| 10751 | { |
| 10752 | /* Save some values that must not be changed. */ |
| 10753 | int saved_x = it->current_x; |
| 10754 | struct text_pos saved_pos; |
| 10755 | int saved_what = it->what; |
| 10756 | int saved_face_id = it->face_id; |
| 10757 | int saved_charset = it->charset; |
| 10758 | Lisp_Object saved_object; |
| 10759 | |
| 10760 | saved_object = it->object; |
| 10761 | saved_pos = it->position; |
| 10762 | |
| 10763 | it->what = IT_CHARACTER; |
| 10764 | bzero (&it->position, sizeof it->position); |
| 10765 | it->object = 0; |
| 10766 | it->c = ' '; |
| 10767 | it->len = 1; |
| 10768 | it->charset = CHARSET_ASCII; |
| 10769 | |
| 10770 | if (default_face_p) |
| 10771 | it->face_id = DEFAULT_FACE_ID; |
| 10772 | if (it->multibyte_p) |
| 10773 | it->face_id = FACE_FOR_CHARSET (it->f, it->face_id, CHARSET_ASCII); |
| 10774 | else |
| 10775 | it->face_id = FACE_FOR_CHARSET (it->f, it->face_id, -1); |
| 10776 | |
| 10777 | PRODUCE_GLYPHS (it); |
| 10778 | |
| 10779 | it->current_x = saved_x; |
| 10780 | it->object = saved_object; |
| 10781 | it->position = saved_pos; |
| 10782 | it->what = saved_what; |
| 10783 | it->face_id = saved_face_id; |
| 10784 | it->charset = saved_charset; |
| 10785 | } |
| 10786 | } |
| 10787 | } |
| 10788 | |
| 10789 | |
| 10790 | /* Extend the face of the last glyph in the text area of IT->glyph_row |
| 10791 | to the end of the display line. Called from display_line. |
| 10792 | If the glyph row is empty, add a space glyph to it so that we |
| 10793 | know the face to draw. Set the glyph row flag fill_line_p. */ |
| 10794 | |
| 10795 | static void |
| 10796 | extend_face_to_end_of_line (it) |
| 10797 | struct it *it; |
| 10798 | { |
| 10799 | struct face *face; |
| 10800 | struct frame *f = it->f; |
| 10801 | |
| 10802 | /* If line is already filled, do nothing. */ |
| 10803 | if (it->current_x >= it->last_visible_x) |
| 10804 | return; |
| 10805 | |
| 10806 | /* Face extension extends the background and box of IT->face_id |
| 10807 | to the end of the line. If the background equals the background |
| 10808 | of the frame, we haven't to do anything. */ |
| 10809 | face = FACE_FROM_ID (f, it->face_id); |
| 10810 | if (FRAME_WINDOW_P (f) |
| 10811 | && face->box == FACE_NO_BOX |
| 10812 | && face->background == FRAME_BACKGROUND_PIXEL (f) |
| 10813 | && !face->stipple) |
| 10814 | return; |
| 10815 | |
| 10816 | /* Set the glyph row flag indicating that the face of the last glyph |
| 10817 | in the text area has to be drawn to the end of the text area. */ |
| 10818 | it->glyph_row->fill_line_p = 1; |
| 10819 | |
| 10820 | /* If current charset of IT is not ASCII, make sure we have the |
| 10821 | ASCII face. This will be automatically undone the next time |
| 10822 | get_next_display_element returns a character from a different |
| 10823 | charset. Note that the charset will always be ASCII in unibyte |
| 10824 | text. */ |
| 10825 | if (it->charset != CHARSET_ASCII) |
| 10826 | { |
| 10827 | it->charset = CHARSET_ASCII; |
| 10828 | it->face_id = FACE_FOR_CHARSET (f, it->face_id, CHARSET_ASCII); |
| 10829 | } |
| 10830 | |
| 10831 | if (FRAME_WINDOW_P (f)) |
| 10832 | { |
| 10833 | /* If the row is empty, add a space with the current face of IT, |
| 10834 | so that we know which face to draw. */ |
| 10835 | if (it->glyph_row->used[TEXT_AREA] == 0) |
| 10836 | { |
| 10837 | it->glyph_row->glyphs[TEXT_AREA][0] = space_glyph; |
| 10838 | it->glyph_row->glyphs[TEXT_AREA][0].u.ch.face_id = it->face_id; |
| 10839 | it->glyph_row->used[TEXT_AREA] = 1; |
| 10840 | } |
| 10841 | } |
| 10842 | else |
| 10843 | { |
| 10844 | /* Save some values that must not be changed. */ |
| 10845 | int saved_x = it->current_x; |
| 10846 | struct text_pos saved_pos; |
| 10847 | Lisp_Object saved_object; |
| 10848 | int saved_what = it->what; |
| 10849 | |
| 10850 | saved_object = it->object; |
| 10851 | saved_pos = it->position; |
| 10852 | |
| 10853 | it->what = IT_CHARACTER; |
| 10854 | bzero (&it->position, sizeof it->position); |
| 10855 | it->object = 0; |
| 10856 | it->c = ' '; |
| 10857 | it->len = 1; |
| 10858 | |
| 10859 | PRODUCE_GLYPHS (it); |
| 10860 | |
| 10861 | while (it->current_x <= it->last_visible_x) |
| 10862 | PRODUCE_GLYPHS (it); |
| 10863 | |
| 10864 | /* Don't count these blanks really. It would let us insert a left |
| 10865 | truncation glyph below and make us set the cursor on them, maybe. */ |
| 10866 | it->current_x = saved_x; |
| 10867 | it->object = saved_object; |
| 10868 | it->position = saved_pos; |
| 10869 | it->what = saved_what; |
| 10870 | } |
| 10871 | } |
| 10872 | |
| 10873 | |
| 10874 | /* Value is non-zero if text starting at CHARPOS in current_buffer is |
| 10875 | trailing whitespace. */ |
| 10876 | |
| 10877 | static int |
| 10878 | trailing_whitespace_p (charpos) |
| 10879 | int charpos; |
| 10880 | { |
| 10881 | int bytepos = CHAR_TO_BYTE (charpos); |
| 10882 | int c = 0; |
| 10883 | |
| 10884 | while (bytepos < ZV_BYTE |
| 10885 | && (c = FETCH_CHAR (bytepos), |
| 10886 | c == ' ' || c == '\t')) |
| 10887 | ++bytepos; |
| 10888 | |
| 10889 | if (bytepos >= ZV_BYTE || c == '\n' || c == '\r') |
| 10890 | { |
| 10891 | if (bytepos != PT_BYTE) |
| 10892 | return 1; |
| 10893 | } |
| 10894 | return 0; |
| 10895 | } |
| 10896 | |
| 10897 | |
| 10898 | /* Highlight trailing whitespace, if any, in ROW. */ |
| 10899 | |
| 10900 | void |
| 10901 | highlight_trailing_whitespace (f, row) |
| 10902 | struct frame *f; |
| 10903 | struct glyph_row *row; |
| 10904 | { |
| 10905 | int used = row->used[TEXT_AREA]; |
| 10906 | |
| 10907 | if (used) |
| 10908 | { |
| 10909 | struct glyph *start = row->glyphs[TEXT_AREA]; |
| 10910 | struct glyph *glyph = start + used - 1; |
| 10911 | |
| 10912 | /* Skip over the space glyph inserted to display the |
| 10913 | cursor at the end of a line. */ |
| 10914 | if (glyph->type == CHAR_GLYPH |
| 10915 | && glyph->u.ch.code == ' ' |
| 10916 | && glyph->object == 0) |
| 10917 | --glyph; |
| 10918 | |
| 10919 | /* If last glyph is a space or stretch, and it's trailing |
| 10920 | whitespace, set the face of all trailing whitespace glyphs in |
| 10921 | IT->glyph_row to `trailing-whitespace'. */ |
| 10922 | if (glyph >= start |
| 10923 | && BUFFERP (glyph->object) |
| 10924 | && (glyph->type == STRETCH_GLYPH |
| 10925 | || (glyph->type == CHAR_GLYPH |
| 10926 | && glyph->u.ch.code == ' ')) |
| 10927 | && trailing_whitespace_p (glyph->charpos)) |
| 10928 | { |
| 10929 | int face_id = lookup_named_face (f, Qtrailing_whitespace, |
| 10930 | CHARSET_ASCII); |
| 10931 | |
| 10932 | while (glyph >= start |
| 10933 | && BUFFERP (glyph->object) |
| 10934 | && (glyph->type == STRETCH_GLYPH |
| 10935 | || (glyph->type == CHAR_GLYPH |
| 10936 | && glyph->u.ch.code == ' '))) |
| 10937 | { |
| 10938 | if (glyph->type == STRETCH_GLYPH) |
| 10939 | glyph->u.stretch.face_id = face_id; |
| 10940 | else |
| 10941 | glyph->u.ch.face_id = face_id; |
| 10942 | --glyph; |
| 10943 | } |
| 10944 | } |
| 10945 | } |
| 10946 | } |
| 10947 | |
| 10948 | |
| 10949 | /* Construct the glyph row IT->glyph_row in the desired matrix of |
| 10950 | IT->w from text at the current position of IT. See dispextern.h |
| 10951 | for an overview of struct it. Value is non-zero if |
| 10952 | IT->glyph_row displays text, as opposed to a line displaying ZV |
| 10953 | only. */ |
| 10954 | |
| 10955 | static int |
| 10956 | display_line (it) |
| 10957 | struct it *it; |
| 10958 | { |
| 10959 | struct glyph_row *row = it->glyph_row; |
| 10960 | |
| 10961 | /* We always start displaying at hpos zero even if hscrolled. */ |
| 10962 | xassert (it->hpos == 0 && it->current_x == 0); |
| 10963 | |
| 10964 | /* We must not display in a row that's not a text row. */ |
| 10965 | xassert (MATRIX_ROW_VPOS (row, it->w->desired_matrix) |
| 10966 | < it->w->desired_matrix->nrows); |
| 10967 | |
| 10968 | /* Is IT->w showing the region? */ |
| 10969 | it->w->region_showing = it->region_beg_charpos > 0 ? Qt : Qnil; |
| 10970 | |
| 10971 | /* Clear the result glyph row and enable it. */ |
| 10972 | prepare_desired_row (row); |
| 10973 | |
| 10974 | row->y = it->current_y; |
| 10975 | row->start = it->current; |
| 10976 | row->continuation_lines_width = it->continuation_lines_width; |
| 10977 | row->displays_text_p = 1; |
| 10978 | |
| 10979 | /* Arrange the overlays nicely for our purposes. Usually, we call |
| 10980 | display_line on only one line at a time, in which case this |
| 10981 | can't really hurt too much, or we call it on lines which appear |
| 10982 | one after another in the buffer, in which case all calls to |
| 10983 | recenter_overlay_lists but the first will be pretty cheap. */ |
| 10984 | recenter_overlay_lists (current_buffer, IT_CHARPOS (*it)); |
| 10985 | |
| 10986 | /* Move over display elements that are not visible because we are |
| 10987 | hscrolled. This may stop at an x-position < IT->first_visible_x |
| 10988 | if the first glyph is partially visible or if we hit a line end. */ |
| 10989 | if (it->current_x < it->first_visible_x) |
| 10990 | move_it_in_display_line_to (it, ZV, it->first_visible_x, |
| 10991 | MOVE_TO_POS | MOVE_TO_X); |
| 10992 | |
| 10993 | /* Get the initial row height. This is either the height of the |
| 10994 | text hscrolled, if there is any, or zero. */ |
| 10995 | row->ascent = it->max_ascent; |
| 10996 | row->height = it->max_ascent + it->max_descent; |
| 10997 | row->phys_ascent = it->max_phys_ascent; |
| 10998 | row->phys_height = it->max_phys_ascent + it->max_phys_descent; |
| 10999 | |
| 11000 | /* Loop generating characters. The loop is left with IT on the next |
| 11001 | character to display. */ |
| 11002 | while (1) |
| 11003 | { |
| 11004 | int n_glyphs_before, hpos_before, x_before; |
| 11005 | int x, i, nglyphs; |
| 11006 | |
| 11007 | /* Retrieve the next thing to display. Value is zero if end of |
| 11008 | buffer reached. */ |
| 11009 | if (!get_next_display_element (it)) |
| 11010 | { |
| 11011 | /* Maybe add a space at the end of this line that is used to |
| 11012 | display the cursor there under X. */ |
| 11013 | append_space (it, 1); |
| 11014 | |
| 11015 | /* The position -1 below indicates a blank line not |
| 11016 | corresponding to any text, as opposed to an empty line |
| 11017 | corresponding to a line end. */ |
| 11018 | if (row->used[TEXT_AREA] <= 1) |
| 11019 | { |
| 11020 | row->glyphs[TEXT_AREA]->charpos = -1; |
| 11021 | row->displays_text_p = 0; |
| 11022 | |
| 11023 | if (!NILP (XBUFFER (it->w->buffer)->indicate_empty_lines)) |
| 11024 | row->indicate_empty_line_p = 1; |
| 11025 | } |
| 11026 | |
| 11027 | it->continuation_lines_width = 0; |
| 11028 | row->ends_at_zv_p = 1; |
| 11029 | break; |
| 11030 | } |
| 11031 | |
| 11032 | /* Now, get the metrics of what we want to display. This also |
| 11033 | generates glyphs in `row' (which is IT->glyph_row). */ |
| 11034 | n_glyphs_before = row->used[TEXT_AREA]; |
| 11035 | x = it->current_x; |
| 11036 | PRODUCE_GLYPHS (it); |
| 11037 | |
| 11038 | /* If this display element was in marginal areas, continue with |
| 11039 | the next one. */ |
| 11040 | if (it->area != TEXT_AREA) |
| 11041 | { |
| 11042 | row->ascent = max (row->ascent, it->max_ascent); |
| 11043 | row->height = max (row->height, it->max_ascent + it->max_descent); |
| 11044 | row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent); |
| 11045 | row->phys_height = max (row->phys_height, |
| 11046 | it->max_phys_ascent + it->max_phys_descent); |
| 11047 | set_iterator_to_next (it); |
| 11048 | continue; |
| 11049 | } |
| 11050 | |
| 11051 | /* Does the display element fit on the line? If we truncate |
| 11052 | lines, we should draw past the right edge of the window. If |
| 11053 | we don't truncate, we want to stop so that we can display the |
| 11054 | continuation glyph before the right margin. If lines are |
| 11055 | continued, there are two possible strategies for characters |
| 11056 | resulting in more than 1 glyph (e.g. tabs): Display as many |
| 11057 | glyphs as possible in this line and leave the rest for the |
| 11058 | continuation line, or display the whole element in the next |
| 11059 | line. Original redisplay did the former, so we do it also. */ |
| 11060 | nglyphs = row->used[TEXT_AREA] - n_glyphs_before; |
| 11061 | hpos_before = it->hpos; |
| 11062 | x_before = x; |
| 11063 | |
| 11064 | if (nglyphs == 1 |
| 11065 | && it->current_x < it->last_visible_x) |
| 11066 | { |
| 11067 | ++it->hpos; |
| 11068 | row->ascent = max (row->ascent, it->max_ascent); |
| 11069 | row->height = max (row->height, it->max_ascent + it->max_descent); |
| 11070 | row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent); |
| 11071 | row->phys_height = max (row->phys_height, |
| 11072 | it->max_phys_ascent + it->max_phys_descent); |
| 11073 | if (it->current_x - it->pixel_width < it->first_visible_x) |
| 11074 | row->x = x - it->first_visible_x; |
| 11075 | } |
| 11076 | else |
| 11077 | { |
| 11078 | int new_x; |
| 11079 | struct glyph *glyph; |
| 11080 | |
| 11081 | for (i = 0; i < nglyphs; ++i, x = new_x) |
| 11082 | { |
| 11083 | glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i; |
| 11084 | new_x = x + glyph->pixel_width; |
| 11085 | |
| 11086 | if (/* Lines are continued. */ |
| 11087 | !it->truncate_lines_p |
| 11088 | && (/* Glyph doesn't fit on the line. */ |
| 11089 | new_x > it->last_visible_x |
| 11090 | /* Or it fits exactly on a window system frame. */ |
| 11091 | || (new_x == it->last_visible_x |
| 11092 | && FRAME_WINDOW_P (it->f)))) |
| 11093 | { |
| 11094 | /* End of a continued line. */ |
| 11095 | |
| 11096 | if (it->hpos == 0 |
| 11097 | || (new_x == it->last_visible_x |
| 11098 | && FRAME_WINDOW_P (it->f))) |
| 11099 | { |
| 11100 | /* Current glyph fits exactly on the line. We |
| 11101 | must continue the line because we can't draw |
| 11102 | the cursor after the glyph. */ |
| 11103 | row->continued_p = 1; |
| 11104 | it->current_x = new_x; |
| 11105 | it->continuation_lines_width += new_x; |
| 11106 | ++it->hpos; |
| 11107 | if (i == nglyphs - 1) |
| 11108 | set_iterator_to_next (it); |
| 11109 | } |
| 11110 | else |
| 11111 | { |
| 11112 | /* Display element draws past the right edge of |
| 11113 | the window. Restore positions to values |
| 11114 | before the element. The next line starts |
| 11115 | with current_x before the glyph that could |
| 11116 | not be displayed, so that TAB works right. */ |
| 11117 | row->used[TEXT_AREA] = n_glyphs_before + i; |
| 11118 | |
| 11119 | /* Display continuation glyphs. */ |
| 11120 | if (!FRAME_WINDOW_P (it->f)) |
| 11121 | produce_special_glyphs (it, IT_CONTINUATION); |
| 11122 | row->continued_p = 1; |
| 11123 | |
| 11124 | it->current_x = x; |
| 11125 | it->continuation_lines_width += x; |
| 11126 | } |
| 11127 | break; |
| 11128 | } |
| 11129 | else if (new_x > it->first_visible_x) |
| 11130 | { |
| 11131 | /* Increment number of glyphs actually displayed. */ |
| 11132 | ++it->hpos; |
| 11133 | |
| 11134 | if (x < it->first_visible_x) |
| 11135 | /* Glyph is partially visible, i.e. row starts at |
| 11136 | negative X position. */ |
| 11137 | row->x = x - it->first_visible_x; |
| 11138 | } |
| 11139 | else |
| 11140 | { |
| 11141 | /* Glyph is completely off the left margin of the |
| 11142 | window. This should not happen because of the |
| 11143 | move_it_in_display_line at the start of |
| 11144 | this function. */ |
| 11145 | abort (); |
| 11146 | } |
| 11147 | } |
| 11148 | |
| 11149 | row->ascent = max (row->ascent, it->max_ascent); |
| 11150 | row->height = max (row->height, it->max_ascent + it->max_descent); |
| 11151 | row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent); |
| 11152 | row->phys_height = max (row->phys_height, |
| 11153 | it->max_phys_ascent + it->max_phys_descent); |
| 11154 | |
| 11155 | /* End of this display line if row is continued. */ |
| 11156 | if (row->continued_p) |
| 11157 | break; |
| 11158 | } |
| 11159 | |
| 11160 | /* Is this a line end? If yes, we're also done, after making |
| 11161 | sure that a non-default face is extended up to the right |
| 11162 | margin of the window. */ |
| 11163 | if (ITERATOR_AT_END_OF_LINE_P (it)) |
| 11164 | { |
| 11165 | int used_before = row->used[TEXT_AREA]; |
| 11166 | |
| 11167 | /* Add a space at the end of the line that is used to |
| 11168 | display the cursor there. */ |
| 11169 | append_space (it, 0); |
| 11170 | |
| 11171 | /* Extend the face to the end of the line. */ |
| 11172 | extend_face_to_end_of_line (it); |
| 11173 | |
| 11174 | /* Make sure we have the position. */ |
| 11175 | if (used_before == 0) |
| 11176 | row->glyphs[TEXT_AREA]->charpos = CHARPOS (it->position); |
| 11177 | |
| 11178 | /* Consume the line end. This skips over invisible lines. */ |
| 11179 | set_iterator_to_next (it); |
| 11180 | it->continuation_lines_width = 0; |
| 11181 | break; |
| 11182 | } |
| 11183 | |
| 11184 | /* Proceed with next display element. Note that this skips |
| 11185 | over lines invisible because of selective display. */ |
| 11186 | set_iterator_to_next (it); |
| 11187 | |
| 11188 | /* If we truncate lines, we are done when the last displayed |
| 11189 | glyphs reach past the right margin of the window. */ |
| 11190 | if (it->truncate_lines_p |
| 11191 | && (FRAME_WINDOW_P (it->f) |
| 11192 | ? (it->current_x >= it->last_visible_x) |
| 11193 | : (it->current_x > it->last_visible_x))) |
| 11194 | { |
| 11195 | /* Maybe add truncation glyphs. */ |
| 11196 | if (!FRAME_WINDOW_P (it->f)) |
| 11197 | { |
| 11198 | --it->glyph_row->used[TEXT_AREA]; |
| 11199 | produce_special_glyphs (it, IT_TRUNCATION); |
| 11200 | } |
| 11201 | |
| 11202 | row->truncated_on_right_p = 1; |
| 11203 | it->continuation_lines_width = 0; |
| 11204 | reseat_at_next_visible_line_start (it, 0); |
| 11205 | row->ends_at_zv_p = FETCH_BYTE (IT_BYTEPOS (*it) - 1) != '\n'; |
| 11206 | it->hpos = hpos_before; |
| 11207 | it->current_x = x_before; |
| 11208 | break; |
| 11209 | } |
| 11210 | } |
| 11211 | |
| 11212 | /* If line is not empty and hscrolled, maybe insert truncation glyphs |
| 11213 | at the left window margin. */ |
| 11214 | if (it->first_visible_x |
| 11215 | && IT_CHARPOS (*it) != MATRIX_ROW_START_CHARPOS (row)) |
| 11216 | { |
| 11217 | if (!FRAME_WINDOW_P (it->f)) |
| 11218 | insert_left_trunc_glyphs (it); |
| 11219 | row->truncated_on_left_p = 1; |
| 11220 | } |
| 11221 | |
| 11222 | /* If the start of this line is the overlay arrow-position, then |
| 11223 | mark this glyph row as the one containing the overlay arrow. |
| 11224 | This is clearly a mess with variable size fonts. It would be |
| 11225 | better to let it be displayed like cursors under X. */ |
| 11226 | if (MARKERP (Voverlay_arrow_position) |
| 11227 | && current_buffer == XMARKER (Voverlay_arrow_position)->buffer |
| 11228 | && (MATRIX_ROW_START_CHARPOS (row) |
| 11229 | == marker_position (Voverlay_arrow_position)) |
| 11230 | && STRINGP (Voverlay_arrow_string) |
| 11231 | && ! overlay_arrow_seen) |
| 11232 | { |
| 11233 | /* Overlay arrow in window redisplay is a bitmap. */ |
| 11234 | if (!FRAME_WINDOW_P (it->f)) |
| 11235 | { |
| 11236 | struct glyph_row *arrow_row = get_overlay_arrow_glyph_row (it->w); |
| 11237 | struct glyph *glyph = arrow_row->glyphs[TEXT_AREA]; |
| 11238 | struct glyph *arrow_end = glyph + arrow_row->used[TEXT_AREA]; |
| 11239 | struct glyph *p = row->glyphs[TEXT_AREA]; |
| 11240 | struct glyph *p2, *end; |
| 11241 | |
| 11242 | /* Copy the arrow glyphs. */ |
| 11243 | while (glyph < arrow_end) |
| 11244 | *p++ = *glyph++; |
| 11245 | |
| 11246 | /* Throw away padding glyphs. */ |
| 11247 | p2 = p; |
| 11248 | end = row->glyphs[TEXT_AREA] + row->used[TEXT_AREA]; |
| 11249 | while (p2 < end && CHAR_GLYPH_PADDING_P (*p2)) |
| 11250 | ++p2; |
| 11251 | if (p2 > p) |
| 11252 | { |
| 11253 | while (p2 < end) |
| 11254 | *p++ = *p2++; |
| 11255 | row->used[TEXT_AREA] = p2 - row->glyphs[TEXT_AREA]; |
| 11256 | } |
| 11257 | } |
| 11258 | |
| 11259 | overlay_arrow_seen = 1; |
| 11260 | row->overlay_arrow_p = 1; |
| 11261 | } |
| 11262 | |
| 11263 | /* Compute pixel dimensions of this line. */ |
| 11264 | compute_line_metrics (it); |
| 11265 | |
| 11266 | /* Remember the position at which this line ends. */ |
| 11267 | row->end = it->current; |
| 11268 | |
| 11269 | /* Maybe set the cursor. If you change this, it's probably a good |
| 11270 | idea to also change the code in redisplay_window for cursor |
| 11271 | movement in an unchanged window. */ |
| 11272 | if (it->w->cursor.vpos < 0 |
| 11273 | && PT >= MATRIX_ROW_START_CHARPOS (row) |
| 11274 | && MATRIX_ROW_END_CHARPOS (row) >= PT |
| 11275 | && !(MATRIX_ROW_END_CHARPOS (row) == PT |
| 11276 | && (MATRIX_ROW_ENDS_IN_MIDDLE_OF_CHAR_P (row) |
| 11277 | || !row->ends_at_zv_p))) |
| 11278 | set_cursor_from_row (it->w, row, it->w->desired_matrix, 0, 0, 0, 0); |
| 11279 | |
| 11280 | /* Highlight trailing whitespace. */ |
| 11281 | if (!NILP (Vshow_trailing_whitespace)) |
| 11282 | highlight_trailing_whitespace (it->f, it->glyph_row); |
| 11283 | |
| 11284 | /* Prepare for the next line. This line starts horizontally at (X |
| 11285 | HPOS) = (0 0). Vertical positions are incremented. As a |
| 11286 | convenience for the caller, IT->glyph_row is set to the next |
| 11287 | row to be used. */ |
| 11288 | it->current_x = it->hpos = 0; |
| 11289 | it->current_y += row->height; |
| 11290 | ++it->vpos; |
| 11291 | ++it->glyph_row; |
| 11292 | return row->displays_text_p; |
| 11293 | } |
| 11294 | |
| 11295 | |
| 11296 | \f |
| 11297 | /*********************************************************************** |
| 11298 | Menu Bar |
| 11299 | ***********************************************************************/ |
| 11300 | |
| 11301 | /* Redisplay the menu bar in the frame for window W. |
| 11302 | |
| 11303 | The menu bar of X frames that don't have X toolkit support is |
| 11304 | displayed in a special window W->frame->menu_bar_window. |
| 11305 | |
| 11306 | The menu bar of terminal frames is treated specially as far as |
| 11307 | glyph matrices are concerned. Menu bar lines are not part of |
| 11308 | windows, so the update is done directly on the frame matrix rows |
| 11309 | for the menu bar. */ |
| 11310 | |
| 11311 | static void |
| 11312 | display_menu_bar (w) |
| 11313 | struct window *w; |
| 11314 | { |
| 11315 | struct frame *f = XFRAME (WINDOW_FRAME (w)); |
| 11316 | struct it it; |
| 11317 | Lisp_Object items; |
| 11318 | int i; |
| 11319 | |
| 11320 | /* Don't do all this for graphical frames. */ |
| 11321 | #ifdef HAVE_NTGUI |
| 11322 | if (!NILP (Vwindow_system)) |
| 11323 | return; |
| 11324 | #endif |
| 11325 | #ifdef USE_X_TOOLKIT |
| 11326 | if (FRAME_X_P (f)) |
| 11327 | return; |
| 11328 | #endif |
| 11329 | |
| 11330 | #ifdef USE_X_TOOLKIT |
| 11331 | xassert (!FRAME_WINDOW_P (f)); |
| 11332 | init_iterator (&it, w, -1, -1, f->desired_matrix->rows, MENU_FACE_ID); |
| 11333 | it.first_visible_x = 0; |
| 11334 | it.last_visible_x = FRAME_WINDOW_WIDTH (f) * CANON_X_UNIT (f); |
| 11335 | #else /* not USE_X_TOOLKIT */ |
| 11336 | if (FRAME_WINDOW_P (f)) |
| 11337 | { |
| 11338 | /* Menu bar lines are displayed in the desired matrix of the |
| 11339 | dummy window menu_bar_window. */ |
| 11340 | struct window *menu_w; |
| 11341 | xassert (WINDOWP (f->menu_bar_window)); |
| 11342 | menu_w = XWINDOW (f->menu_bar_window); |
| 11343 | init_iterator (&it, menu_w, -1, -1, menu_w->desired_matrix->rows, |
| 11344 | MENU_FACE_ID); |
| 11345 | it.first_visible_x = 0; |
| 11346 | it.last_visible_x = FRAME_WINDOW_WIDTH (f) * CANON_X_UNIT (f); |
| 11347 | } |
| 11348 | else |
| 11349 | { |
| 11350 | /* This is a TTY frame, i.e. character hpos/vpos are used as |
| 11351 | pixel x/y. */ |
| 11352 | init_iterator (&it, w, -1, -1, f->desired_matrix->rows, |
| 11353 | MENU_FACE_ID); |
| 11354 | it.first_visible_x = 0; |
| 11355 | it.last_visible_x = FRAME_WIDTH (f); |
| 11356 | } |
| 11357 | #endif /* not USE_X_TOOLKIT */ |
| 11358 | |
| 11359 | /* Clear all rows of the menu bar. */ |
| 11360 | for (i = 0; i < FRAME_MENU_BAR_LINES (f); ++i) |
| 11361 | { |
| 11362 | struct glyph_row *row = it.glyph_row + i; |
| 11363 | clear_glyph_row (row); |
| 11364 | row->enabled_p = 1; |
| 11365 | row->full_width_p = 1; |
| 11366 | } |
| 11367 | |
| 11368 | /* Make the first line of the menu bar appear in reverse video. */ |
| 11369 | it.glyph_row->inverse_p = mode_line_inverse_video != 0; |
| 11370 | |
| 11371 | /* Display all items of the menu bar. */ |
| 11372 | items = FRAME_MENU_BAR_ITEMS (it.f); |
| 11373 | for (i = 0; i < XVECTOR (items)->size; i += 4) |
| 11374 | { |
| 11375 | Lisp_Object string; |
| 11376 | |
| 11377 | /* Stop at nil string. */ |
| 11378 | string = XVECTOR (items)->contents[i + 1]; |
| 11379 | if (NILP (string)) |
| 11380 | break; |
| 11381 | |
| 11382 | /* Remember where item was displayed. */ |
| 11383 | XSETFASTINT (XVECTOR (items)->contents[i + 3], it.hpos); |
| 11384 | |
| 11385 | /* Display the item, pad with one space. */ |
| 11386 | if (it.current_x < it.last_visible_x) |
| 11387 | display_string (NULL, string, Qnil, 0, 0, &it, |
| 11388 | XSTRING (string)->size + 1, 0, 0, -1); |
| 11389 | } |
| 11390 | |
| 11391 | /* Fill out the line with spaces. */ |
| 11392 | if (it.current_x < it.last_visible_x) |
| 11393 | display_string ("", Qnil, Qnil, 0, 0, &it, -1, 0, 0, -1); |
| 11394 | |
| 11395 | /* Compute the total height of the lines. */ |
| 11396 | compute_line_metrics (&it); |
| 11397 | } |
| 11398 | |
| 11399 | |
| 11400 | \f |
| 11401 | /*********************************************************************** |
| 11402 | Mode Line |
| 11403 | ***********************************************************************/ |
| 11404 | |
| 11405 | /* Display the mode and/or top line of window W. */ |
| 11406 | |
| 11407 | static void |
| 11408 | display_mode_lines (w) |
| 11409 | struct window *w; |
| 11410 | { |
| 11411 | /* These will be set while the mode line specs are processed. */ |
| 11412 | line_number_displayed = 0; |
| 11413 | w->column_number_displayed = Qnil; |
| 11414 | |
| 11415 | if (WINDOW_WANTS_MODELINE_P (w)) |
| 11416 | display_mode_line (w, MODE_LINE_FACE_ID, |
| 11417 | current_buffer->mode_line_format); |
| 11418 | |
| 11419 | if (WINDOW_WANTS_HEADER_LINE_P (w)) |
| 11420 | display_mode_line (w, HEADER_LINE_FACE_ID, |
| 11421 | current_buffer->header_line_format); |
| 11422 | } |
| 11423 | |
| 11424 | |
| 11425 | /* Display mode or top line of window W. FACE_ID specifies which line |
| 11426 | to display; it is either MODE_LINE_FACE_ID or HEADER_LINE_FACE_ID. |
| 11427 | FORMAT is the mode line format to display. */ |
| 11428 | |
| 11429 | static void |
| 11430 | display_mode_line (w, face_id, format) |
| 11431 | struct window *w; |
| 11432 | enum face_id face_id; |
| 11433 | Lisp_Object format; |
| 11434 | { |
| 11435 | struct it it; |
| 11436 | struct face *face; |
| 11437 | |
| 11438 | init_iterator (&it, w, -1, -1, NULL, face_id); |
| 11439 | prepare_desired_row (it.glyph_row); |
| 11440 | |
| 11441 | /* Temporarily make frame's keyboard the current kboard so that |
| 11442 | kboard-local variables in the mode_line_format will get the right |
| 11443 | values. */ |
| 11444 | push_frame_kboard (it.f); |
| 11445 | display_mode_element (&it, 0, 0, 0, format); |
| 11446 | pop_frame_kboard (); |
| 11447 | |
| 11448 | /* Fill up with spaces. */ |
| 11449 | display_string (" ", Qnil, Qnil, 0, 0, &it, 10000, -1, -1, 0); |
| 11450 | |
| 11451 | compute_line_metrics (&it); |
| 11452 | it.glyph_row->full_width_p = 1; |
| 11453 | it.glyph_row->mode_line_p = 1; |
| 11454 | it.glyph_row->inverse_p = mode_line_inverse_video != 0; |
| 11455 | it.glyph_row->continued_p = 0; |
| 11456 | it.glyph_row->truncated_on_left_p = 0; |
| 11457 | it.glyph_row->truncated_on_right_p = 0; |
| 11458 | |
| 11459 | /* Make a 3D mode-line have a shadow at its right end. */ |
| 11460 | face = FACE_FROM_ID (it.f, face_id); |
| 11461 | extend_face_to_end_of_line (&it); |
| 11462 | if (face->box != FACE_NO_BOX) |
| 11463 | { |
| 11464 | struct glyph *last = (it.glyph_row->glyphs[TEXT_AREA] |
| 11465 | + it.glyph_row->used[TEXT_AREA] - 1); |
| 11466 | last->right_box_line_p = 1; |
| 11467 | } |
| 11468 | } |
| 11469 | |
| 11470 | |
| 11471 | /* Contribute ELT to the mode line for window IT->w. How it |
| 11472 | translates into text depends on its data type. |
| 11473 | |
| 11474 | IT describes the display environment in which we display, as usual. |
| 11475 | |
| 11476 | DEPTH is the depth in recursion. It is used to prevent |
| 11477 | infinite recursion here. |
| 11478 | |
| 11479 | FIELD_WIDTH is the number of characters the display of ELT should |
| 11480 | occupy in the mode line, and PRECISION is the maximum number of |
| 11481 | characters to display from ELT's representation. See |
| 11482 | display_string for details. * |
| 11483 | |
| 11484 | Returns the hpos of the end of the text generated by ELT. */ |
| 11485 | |
| 11486 | static int |
| 11487 | display_mode_element (it, depth, field_width, precision, elt) |
| 11488 | struct it *it; |
| 11489 | int depth; |
| 11490 | int field_width, precision; |
| 11491 | Lisp_Object elt; |
| 11492 | { |
| 11493 | int n = 0, field, prec; |
| 11494 | |
| 11495 | tail_recurse: |
| 11496 | if (depth > 10) |
| 11497 | goto invalid; |
| 11498 | |
| 11499 | depth++; |
| 11500 | |
| 11501 | switch (SWITCH_ENUM_CAST (XTYPE (elt))) |
| 11502 | { |
| 11503 | case Lisp_String: |
| 11504 | { |
| 11505 | /* A string: output it and check for %-constructs within it. */ |
| 11506 | unsigned char c; |
| 11507 | unsigned char *this = XSTRING (elt)->data; |
| 11508 | unsigned char *lisp_string = this; |
| 11509 | |
| 11510 | while ((precision <= 0 || n < precision) |
| 11511 | && *this |
| 11512 | && (frame_title_ptr |
| 11513 | || it->current_x < it->last_visible_x)) |
| 11514 | { |
| 11515 | unsigned char *last = this; |
| 11516 | |
| 11517 | /* Advance to end of string or next format specifier. */ |
| 11518 | while ((c = *this++) != '\0' && c != '%') |
| 11519 | ; |
| 11520 | |
| 11521 | if (this - 1 != last) |
| 11522 | { |
| 11523 | /* Output to end of string or up to '%'. Field width |
| 11524 | is length of string. Don't output more than |
| 11525 | PRECISION allows us. */ |
| 11526 | prec = --this - last; |
| 11527 | if (precision > 0 && prec > precision - n) |
| 11528 | prec = precision - n; |
| 11529 | |
| 11530 | if (frame_title_ptr) |
| 11531 | n += store_frame_title (last, prec, prec); |
| 11532 | else |
| 11533 | n += display_string (NULL, elt, Qnil, 0, last - lisp_string, |
| 11534 | it, 0, prec, 0, -1); |
| 11535 | } |
| 11536 | else /* c == '%' */ |
| 11537 | { |
| 11538 | unsigned char *percent_position = this; |
| 11539 | |
| 11540 | /* Get the specified minimum width. Zero means |
| 11541 | don't pad. */ |
| 11542 | field = 0; |
| 11543 | while ((c = *this++) >= '0' && c <= '9') |
| 11544 | field = field * 10 + c - '0'; |
| 11545 | |
| 11546 | /* Don't pad beyond the total padding allowed. */ |
| 11547 | if (field_width - n > 0 && field > field_width - n) |
| 11548 | field = field_width - n; |
| 11549 | |
| 11550 | /* Note that either PRECISION <= 0 or N < PRECISION. */ |
| 11551 | prec = precision - n; |
| 11552 | |
| 11553 | if (c == 'M') |
| 11554 | n += display_mode_element (it, depth, field, prec, |
| 11555 | Vglobal_mode_string); |
| 11556 | else if (c != 0) |
| 11557 | { |
| 11558 | unsigned char *spec |
| 11559 | = decode_mode_spec (it->w, c, field, prec); |
| 11560 | |
| 11561 | if (frame_title_ptr) |
| 11562 | n += store_frame_title (spec, field, prec); |
| 11563 | else |
| 11564 | { |
| 11565 | int nglyphs_before |
| 11566 | = it->glyph_row->used[TEXT_AREA]; |
| 11567 | int charpos |
| 11568 | = percent_position - XSTRING (elt)->data; |
| 11569 | int nwritten |
| 11570 | = display_string (spec, Qnil, elt, charpos, 0, it, |
| 11571 | field, prec, 0, -1); |
| 11572 | |
| 11573 | /* Assign to the glyphs written above the |
| 11574 | string where the `%x' came from, position |
| 11575 | of the `%'. */ |
| 11576 | if (nwritten > 0) |
| 11577 | { |
| 11578 | struct glyph *glyph |
| 11579 | = (it->glyph_row->glyphs[TEXT_AREA] |
| 11580 | + nglyphs_before); |
| 11581 | int i; |
| 11582 | |
| 11583 | for (i = 0; i < nwritten; ++i) |
| 11584 | { |
| 11585 | glyph[i].object = elt; |
| 11586 | glyph[i].charpos = charpos; |
| 11587 | } |
| 11588 | |
| 11589 | n += nwritten; |
| 11590 | } |
| 11591 | } |
| 11592 | } |
| 11593 | } |
| 11594 | } |
| 11595 | } |
| 11596 | break; |
| 11597 | |
| 11598 | case Lisp_Symbol: |
| 11599 | /* A symbol: process the value of the symbol recursively |
| 11600 | as if it appeared here directly. Avoid error if symbol void. |
| 11601 | Special case: if value of symbol is a string, output the string |
| 11602 | literally. */ |
| 11603 | { |
| 11604 | register Lisp_Object tem; |
| 11605 | tem = Fboundp (elt); |
| 11606 | if (!NILP (tem)) |
| 11607 | { |
| 11608 | tem = Fsymbol_value (elt); |
| 11609 | /* If value is a string, output that string literally: |
| 11610 | don't check for % within it. */ |
| 11611 | if (STRINGP (tem)) |
| 11612 | { |
| 11613 | prec = XSTRING (tem)->size; |
| 11614 | if (precision > 0 && prec > precision - n) |
| 11615 | prec = precision - n; |
| 11616 | if (frame_title_ptr) |
| 11617 | n += store_frame_title (XSTRING (tem)->data, -1, prec); |
| 11618 | else |
| 11619 | n += display_string (NULL, tem, Qnil, 0, 0, it, |
| 11620 | 0, prec, 0, -1); |
| 11621 | } |
| 11622 | else if (!EQ (tem, elt)) |
| 11623 | { |
| 11624 | /* Give up right away for nil or t. */ |
| 11625 | elt = tem; |
| 11626 | goto tail_recurse; |
| 11627 | } |
| 11628 | } |
| 11629 | } |
| 11630 | break; |
| 11631 | |
| 11632 | case Lisp_Cons: |
| 11633 | { |
| 11634 | register Lisp_Object car, tem; |
| 11635 | |
| 11636 | /* A cons cell: three distinct cases. |
| 11637 | If first element is a string or a cons, process all the elements |
| 11638 | and effectively concatenate them. |
| 11639 | If first element is a negative number, truncate displaying cdr to |
| 11640 | at most that many characters. If positive, pad (with spaces) |
| 11641 | to at least that many characters. |
| 11642 | If first element is a symbol, process the cadr or caddr recursively |
| 11643 | according to whether the symbol's value is non-nil or nil. */ |
| 11644 | car = XCAR (elt); |
| 11645 | if (EQ (car, QCeval) && CONSP (XCDR (elt))) |
| 11646 | { |
| 11647 | /* An element of the form (:eval FORM) means evaluate FORM |
| 11648 | and use the result as mode line elements. */ |
| 11649 | struct gcpro gcpro1; |
| 11650 | Lisp_Object spec; |
| 11651 | |
| 11652 | spec = eval_form (XCAR (XCDR (elt))); |
| 11653 | GCPRO1 (spec); |
| 11654 | n += display_mode_element (it, depth, field_width - n, |
| 11655 | precision - n, spec); |
| 11656 | UNGCPRO; |
| 11657 | } |
| 11658 | else if (SYMBOLP (car)) |
| 11659 | { |
| 11660 | tem = Fboundp (car); |
| 11661 | elt = XCDR (elt); |
| 11662 | if (!CONSP (elt)) |
| 11663 | goto invalid; |
| 11664 | /* elt is now the cdr, and we know it is a cons cell. |
| 11665 | Use its car if CAR has a non-nil value. */ |
| 11666 | if (!NILP (tem)) |
| 11667 | { |
| 11668 | tem = Fsymbol_value (car); |
| 11669 | if (!NILP (tem)) |
| 11670 | { |
| 11671 | elt = XCAR (elt); |
| 11672 | goto tail_recurse; |
| 11673 | } |
| 11674 | } |
| 11675 | /* Symbol's value is nil (or symbol is unbound) |
| 11676 | Get the cddr of the original list |
| 11677 | and if possible find the caddr and use that. */ |
| 11678 | elt = XCDR (elt); |
| 11679 | if (NILP (elt)) |
| 11680 | break; |
| 11681 | else if (!CONSP (elt)) |
| 11682 | goto invalid; |
| 11683 | elt = XCAR (elt); |
| 11684 | goto tail_recurse; |
| 11685 | } |
| 11686 | else if (INTEGERP (car)) |
| 11687 | { |
| 11688 | register int lim = XINT (car); |
| 11689 | elt = XCDR (elt); |
| 11690 | if (lim < 0) |
| 11691 | { |
| 11692 | /* Negative int means reduce maximum width. */ |
| 11693 | if (precision <= 0) |
| 11694 | precision = -lim; |
| 11695 | else |
| 11696 | precision = min (precision, -lim); |
| 11697 | } |
| 11698 | else if (lim > 0) |
| 11699 | { |
| 11700 | /* Padding specified. Don't let it be more than |
| 11701 | current maximum. */ |
| 11702 | if (precision > 0) |
| 11703 | lim = min (precision, lim); |
| 11704 | |
| 11705 | /* If that's more padding than already wanted, queue it. |
| 11706 | But don't reduce padding already specified even if |
| 11707 | that is beyond the current truncation point. */ |
| 11708 | field_width = max (lim, field_width); |
| 11709 | } |
| 11710 | goto tail_recurse; |
| 11711 | } |
| 11712 | else if (STRINGP (car) || CONSP (car)) |
| 11713 | { |
| 11714 | register int limit = 50; |
| 11715 | /* Limit is to protect against circular lists. */ |
| 11716 | while (CONSP (elt) |
| 11717 | && --limit > 0 |
| 11718 | && (precision <= 0 || n < precision)) |
| 11719 | { |
| 11720 | n += display_mode_element (it, depth, field_width - n, |
| 11721 | precision - n, XCAR (elt)); |
| 11722 | elt = XCDR (elt); |
| 11723 | } |
| 11724 | } |
| 11725 | } |
| 11726 | break; |
| 11727 | |
| 11728 | default: |
| 11729 | invalid: |
| 11730 | if (frame_title_ptr) |
| 11731 | n += store_frame_title ("*invalid*", 0, precision - n); |
| 11732 | else |
| 11733 | n += display_string ("*invalid*", Qnil, Qnil, 0, 0, it, 0, |
| 11734 | precision - n, 0, 0); |
| 11735 | return n; |
| 11736 | } |
| 11737 | |
| 11738 | /* Pad to FIELD_WIDTH. */ |
| 11739 | if (field_width > 0 && n < field_width) |
| 11740 | { |
| 11741 | if (frame_title_ptr) |
| 11742 | n += store_frame_title ("", field_width - n, 0); |
| 11743 | else |
| 11744 | n += display_string ("", Qnil, Qnil, 0, 0, it, field_width - n, |
| 11745 | 0, 0, 0); |
| 11746 | } |
| 11747 | |
| 11748 | return n; |
| 11749 | } |
| 11750 | |
| 11751 | |
| 11752 | /* Write a null-terminated, right justified decimal representation of |
| 11753 | the positive integer D to BUF using a minimal field width WIDTH. */ |
| 11754 | |
| 11755 | static void |
| 11756 | pint2str (buf, width, d) |
| 11757 | register char *buf; |
| 11758 | register int width; |
| 11759 | register int d; |
| 11760 | { |
| 11761 | register char *p = buf; |
| 11762 | |
| 11763 | if (d <= 0) |
| 11764 | *p++ = '0'; |
| 11765 | else |
| 11766 | { |
| 11767 | while (d > 0) |
| 11768 | { |
| 11769 | *p++ = d % 10 + '0'; |
| 11770 | d /= 10; |
| 11771 | } |
| 11772 | } |
| 11773 | |
| 11774 | for (width -= (int) (p - buf); width > 0; --width) |
| 11775 | *p++ = ' '; |
| 11776 | *p-- = '\0'; |
| 11777 | while (p > buf) |
| 11778 | { |
| 11779 | d = *buf; |
| 11780 | *buf++ = *p; |
| 11781 | *p-- = d; |
| 11782 | } |
| 11783 | } |
| 11784 | |
| 11785 | /* Set a mnemonic character for coding_system (Lisp symbol) in BUF. |
| 11786 | If EOL_FLAG is 1, set also a mnemonic character for end-of-line |
| 11787 | type of CODING_SYSTEM. Return updated pointer into BUF. */ |
| 11788 | |
| 11789 | static unsigned char invalid_eol_type[] = "(*invalid*)"; |
| 11790 | |
| 11791 | static char * |
| 11792 | decode_mode_spec_coding (coding_system, buf, eol_flag) |
| 11793 | Lisp_Object coding_system; |
| 11794 | register char *buf; |
| 11795 | int eol_flag; |
| 11796 | { |
| 11797 | Lisp_Object val; |
| 11798 | int multibyte = !NILP (current_buffer->enable_multibyte_characters); |
| 11799 | unsigned char *eol_str; |
| 11800 | int eol_str_len; |
| 11801 | /* The EOL conversion we are using. */ |
| 11802 | Lisp_Object eoltype; |
| 11803 | |
| 11804 | val = coding_system; |
| 11805 | |
| 11806 | if (NILP (val)) /* Not yet decided. */ |
| 11807 | { |
| 11808 | if (multibyte) |
| 11809 | *buf++ = '-'; |
| 11810 | if (eol_flag) |
| 11811 | eoltype = eol_mnemonic_undecided; |
| 11812 | /* Don't mention EOL conversion if it isn't decided. */ |
| 11813 | } |
| 11814 | else |
| 11815 | { |
| 11816 | Lisp_Object eolvalue; |
| 11817 | |
| 11818 | eolvalue = Fget (coding_system, Qeol_type); |
| 11819 | |
| 11820 | while (!NILP (val) && SYMBOLP (val)) |
| 11821 | { |
| 11822 | val = Fget (val, Qcoding_system); |
| 11823 | if (NILP (eolvalue)) |
| 11824 | eolvalue = Fget (val, Qeol_type); |
| 11825 | } |
| 11826 | |
| 11827 | if (multibyte) |
| 11828 | *buf++ = XFASTINT (XVECTOR (val)->contents[1]); |
| 11829 | |
| 11830 | if (eol_flag) |
| 11831 | { |
| 11832 | /* The EOL conversion that is normal on this system. */ |
| 11833 | |
| 11834 | if (NILP (eolvalue)) /* Not yet decided. */ |
| 11835 | eoltype = eol_mnemonic_undecided; |
| 11836 | else if (VECTORP (eolvalue)) /* Not yet decided. */ |
| 11837 | eoltype = eol_mnemonic_undecided; |
| 11838 | else /* INTEGERP (eolvalue) -- 0:LF, 1:CRLF, 2:CR */ |
| 11839 | eoltype = (XFASTINT (eolvalue) == 0 |
| 11840 | ? eol_mnemonic_unix |
| 11841 | : (XFASTINT (eolvalue) == 1 |
| 11842 | ? eol_mnemonic_dos : eol_mnemonic_mac)); |
| 11843 | } |
| 11844 | } |
| 11845 | |
| 11846 | if (eol_flag) |
| 11847 | { |
| 11848 | /* Mention the EOL conversion if it is not the usual one. */ |
| 11849 | if (STRINGP (eoltype)) |
| 11850 | { |
| 11851 | eol_str = XSTRING (eoltype)->data; |
| 11852 | eol_str_len = XSTRING (eoltype)->size; |
| 11853 | } |
| 11854 | else if (INTEGERP (eoltype) |
| 11855 | && CHAR_VALID_P (XINT (eoltype), 0)) |
| 11856 | { |
| 11857 | unsigned char work[4]; |
| 11858 | |
| 11859 | eol_str_len = CHAR_STRING (XINT (eoltype), work, eol_str); |
| 11860 | } |
| 11861 | else |
| 11862 | { |
| 11863 | eol_str = invalid_eol_type; |
| 11864 | eol_str_len = sizeof (invalid_eol_type) - 1; |
| 11865 | } |
| 11866 | bcopy (eol_str, buf, eol_str_len); |
| 11867 | buf += eol_str_len; |
| 11868 | } |
| 11869 | |
| 11870 | return buf; |
| 11871 | } |
| 11872 | |
| 11873 | /* Return a string for the output of a mode line %-spec for window W, |
| 11874 | generated by character C. PRECISION >= 0 means don't return a |
| 11875 | string longer than that value. FIELD_WIDTH > 0 means pad the |
| 11876 | string returned with spaces to that value. */ |
| 11877 | |
| 11878 | static char lots_of_dashes[] = "--------------------------------------------------------------------------------------------------------------------------------------------"; |
| 11879 | |
| 11880 | static char * |
| 11881 | decode_mode_spec (w, c, field_width, precision) |
| 11882 | struct window *w; |
| 11883 | register int c; |
| 11884 | int field_width, precision; |
| 11885 | { |
| 11886 | Lisp_Object obj; |
| 11887 | struct frame *f = XFRAME (WINDOW_FRAME (w)); |
| 11888 | char *decode_mode_spec_buf = f->decode_mode_spec_buffer; |
| 11889 | struct buffer *b = XBUFFER (w->buffer); |
| 11890 | |
| 11891 | obj = Qnil; |
| 11892 | |
| 11893 | switch (c) |
| 11894 | { |
| 11895 | case '*': |
| 11896 | if (!NILP (b->read_only)) |
| 11897 | return "%"; |
| 11898 | if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b)) |
| 11899 | return "*"; |
| 11900 | return "-"; |
| 11901 | |
| 11902 | case '+': |
| 11903 | /* This differs from %* only for a modified read-only buffer. */ |
| 11904 | if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b)) |
| 11905 | return "*"; |
| 11906 | if (!NILP (b->read_only)) |
| 11907 | return "%"; |
| 11908 | return "-"; |
| 11909 | |
| 11910 | case '&': |
| 11911 | /* This differs from %* in ignoring read-only-ness. */ |
| 11912 | if (BUF_MODIFF (b) > BUF_SAVE_MODIFF (b)) |
| 11913 | return "*"; |
| 11914 | return "-"; |
| 11915 | |
| 11916 | case '%': |
| 11917 | return "%"; |
| 11918 | |
| 11919 | case '[': |
| 11920 | { |
| 11921 | int i; |
| 11922 | char *p; |
| 11923 | |
| 11924 | if (command_loop_level > 5) |
| 11925 | return "[[[... "; |
| 11926 | p = decode_mode_spec_buf; |
| 11927 | for (i = 0; i < command_loop_level; i++) |
| 11928 | *p++ = '['; |
| 11929 | *p = 0; |
| 11930 | return decode_mode_spec_buf; |
| 11931 | } |
| 11932 | |
| 11933 | case ']': |
| 11934 | { |
| 11935 | int i; |
| 11936 | char *p; |
| 11937 | |
| 11938 | if (command_loop_level > 5) |
| 11939 | return " ...]]]"; |
| 11940 | p = decode_mode_spec_buf; |
| 11941 | for (i = 0; i < command_loop_level; i++) |
| 11942 | *p++ = ']'; |
| 11943 | *p = 0; |
| 11944 | return decode_mode_spec_buf; |
| 11945 | } |
| 11946 | |
| 11947 | case '-': |
| 11948 | { |
| 11949 | register int i; |
| 11950 | |
| 11951 | /* Let lots_of_dashes be a string of infinite length. */ |
| 11952 | if (field_width <= 0 |
| 11953 | || field_width > sizeof (lots_of_dashes)) |
| 11954 | { |
| 11955 | for (i = 0; i < FRAME_MESSAGE_BUF_SIZE (f) - 1; ++i) |
| 11956 | decode_mode_spec_buf[i] = '-'; |
| 11957 | decode_mode_spec_buf[i] = '\0'; |
| 11958 | return decode_mode_spec_buf; |
| 11959 | } |
| 11960 | else |
| 11961 | return lots_of_dashes; |
| 11962 | } |
| 11963 | |
| 11964 | case 'b': |
| 11965 | obj = b->name; |
| 11966 | break; |
| 11967 | |
| 11968 | case 'c': |
| 11969 | { |
| 11970 | int col = current_column (); |
| 11971 | XSETFASTINT (w->column_number_displayed, col); |
| 11972 | pint2str (decode_mode_spec_buf, field_width, col); |
| 11973 | return decode_mode_spec_buf; |
| 11974 | } |
| 11975 | |
| 11976 | case 'F': |
| 11977 | /* %F displays the frame name. */ |
| 11978 | if (!NILP (f->title)) |
| 11979 | return (char *) XSTRING (f->title)->data; |
| 11980 | if (f->explicit_name || ! FRAME_WINDOW_P (f)) |
| 11981 | return (char *) XSTRING (f->name)->data; |
| 11982 | return "Emacs"; |
| 11983 | |
| 11984 | case 'f': |
| 11985 | obj = b->filename; |
| 11986 | break; |
| 11987 | |
| 11988 | case 'l': |
| 11989 | { |
| 11990 | int startpos = XMARKER (w->start)->charpos; |
| 11991 | int startpos_byte = marker_byte_position (w->start); |
| 11992 | int line, linepos, linepos_byte, topline; |
| 11993 | int nlines, junk; |
| 11994 | int height = XFASTINT (w->height); |
| 11995 | |
| 11996 | /* If we decided that this buffer isn't suitable for line numbers, |
| 11997 | don't forget that too fast. */ |
| 11998 | if (EQ (w->base_line_pos, w->buffer)) |
| 11999 | goto no_value; |
| 12000 | /* But do forget it, if the window shows a different buffer now. */ |
| 12001 | else if (BUFFERP (w->base_line_pos)) |
| 12002 | w->base_line_pos = Qnil; |
| 12003 | |
| 12004 | /* If the buffer is very big, don't waste time. */ |
| 12005 | if (BUF_ZV (b) - BUF_BEGV (b) > line_number_display_limit) |
| 12006 | { |
| 12007 | w->base_line_pos = Qnil; |
| 12008 | w->base_line_number = Qnil; |
| 12009 | goto no_value; |
| 12010 | } |
| 12011 | |
| 12012 | if (!NILP (w->base_line_number) |
| 12013 | && !NILP (w->base_line_pos) |
| 12014 | && XFASTINT (w->base_line_pos) <= startpos) |
| 12015 | { |
| 12016 | line = XFASTINT (w->base_line_number); |
| 12017 | linepos = XFASTINT (w->base_line_pos); |
| 12018 | linepos_byte = buf_charpos_to_bytepos (b, linepos); |
| 12019 | } |
| 12020 | else |
| 12021 | { |
| 12022 | line = 1; |
| 12023 | linepos = BUF_BEGV (b); |
| 12024 | linepos_byte = BUF_BEGV_BYTE (b); |
| 12025 | } |
| 12026 | |
| 12027 | /* Count lines from base line to window start position. */ |
| 12028 | nlines = display_count_lines (linepos, linepos_byte, |
| 12029 | startpos_byte, |
| 12030 | startpos, &junk); |
| 12031 | |
| 12032 | topline = nlines + line; |
| 12033 | |
| 12034 | /* Determine a new base line, if the old one is too close |
| 12035 | or too far away, or if we did not have one. |
| 12036 | "Too close" means it's plausible a scroll-down would |
| 12037 | go back past it. */ |
| 12038 | if (startpos == BUF_BEGV (b)) |
| 12039 | { |
| 12040 | XSETFASTINT (w->base_line_number, topline); |
| 12041 | XSETFASTINT (w->base_line_pos, BUF_BEGV (b)); |
| 12042 | } |
| 12043 | else if (nlines < height + 25 || nlines > height * 3 + 50 |
| 12044 | || linepos == BUF_BEGV (b)) |
| 12045 | { |
| 12046 | int limit = BUF_BEGV (b); |
| 12047 | int limit_byte = BUF_BEGV_BYTE (b); |
| 12048 | int position; |
| 12049 | int distance = (height * 2 + 30) * line_number_display_limit_width; |
| 12050 | |
| 12051 | if (startpos - distance > limit) |
| 12052 | { |
| 12053 | limit = startpos - distance; |
| 12054 | limit_byte = CHAR_TO_BYTE (limit); |
| 12055 | } |
| 12056 | |
| 12057 | nlines = display_count_lines (startpos, startpos_byte, |
| 12058 | limit_byte, |
| 12059 | - (height * 2 + 30), |
| 12060 | &position); |
| 12061 | /* If we couldn't find the lines we wanted within |
| 12062 | line_number_display_limit_width chars per line, |
| 12063 | give up on line numbers for this window. */ |
| 12064 | if (position == limit_byte && limit == startpos - distance) |
| 12065 | { |
| 12066 | w->base_line_pos = w->buffer; |
| 12067 | w->base_line_number = Qnil; |
| 12068 | goto no_value; |
| 12069 | } |
| 12070 | |
| 12071 | XSETFASTINT (w->base_line_number, topline - nlines); |
| 12072 | XSETFASTINT (w->base_line_pos, BYTE_TO_CHAR (position)); |
| 12073 | } |
| 12074 | |
| 12075 | /* Now count lines from the start pos to point. */ |
| 12076 | nlines = display_count_lines (startpos, startpos_byte, |
| 12077 | PT_BYTE, PT, &junk); |
| 12078 | |
| 12079 | /* Record that we did display the line number. */ |
| 12080 | line_number_displayed = 1; |
| 12081 | |
| 12082 | /* Make the string to show. */ |
| 12083 | pint2str (decode_mode_spec_buf, field_width, topline + nlines); |
| 12084 | return decode_mode_spec_buf; |
| 12085 | no_value: |
| 12086 | { |
| 12087 | char* p = decode_mode_spec_buf; |
| 12088 | int pad = field_width - 2; |
| 12089 | while (pad-- > 0) |
| 12090 | *p++ = ' '; |
| 12091 | *p++ = '?'; |
| 12092 | *p = '?'; |
| 12093 | return decode_mode_spec_buf; |
| 12094 | } |
| 12095 | } |
| 12096 | break; |
| 12097 | |
| 12098 | case 'm': |
| 12099 | obj = b->mode_name; |
| 12100 | break; |
| 12101 | |
| 12102 | case 'n': |
| 12103 | if (BUF_BEGV (b) > BUF_BEG (b) || BUF_ZV (b) < BUF_Z (b)) |
| 12104 | return " Narrow"; |
| 12105 | break; |
| 12106 | |
| 12107 | case 'p': |
| 12108 | { |
| 12109 | int pos = marker_position (w->start); |
| 12110 | int total = BUF_ZV (b) - BUF_BEGV (b); |
| 12111 | |
| 12112 | if (XFASTINT (w->window_end_pos) <= BUF_Z (b) - BUF_ZV (b)) |
| 12113 | { |
| 12114 | if (pos <= BUF_BEGV (b)) |
| 12115 | return "All"; |
| 12116 | else |
| 12117 | return "Bottom"; |
| 12118 | } |
| 12119 | else if (pos <= BUF_BEGV (b)) |
| 12120 | return "Top"; |
| 12121 | else |
| 12122 | { |
| 12123 | if (total > 1000000) |
| 12124 | /* Do it differently for a large value, to avoid overflow. */ |
| 12125 | total = ((pos - BUF_BEGV (b)) + (total / 100) - 1) / (total / 100); |
| 12126 | else |
| 12127 | total = ((pos - BUF_BEGV (b)) * 100 + total - 1) / total; |
| 12128 | /* We can't normally display a 3-digit number, |
| 12129 | so get us a 2-digit number that is close. */ |
| 12130 | if (total == 100) |
| 12131 | total = 99; |
| 12132 | sprintf (decode_mode_spec_buf, "%2d%%", total); |
| 12133 | return decode_mode_spec_buf; |
| 12134 | } |
| 12135 | } |
| 12136 | |
| 12137 | /* Display percentage of size above the bottom of the screen. */ |
| 12138 | case 'P': |
| 12139 | { |
| 12140 | int toppos = marker_position (w->start); |
| 12141 | int botpos = BUF_Z (b) - XFASTINT (w->window_end_pos); |
| 12142 | int total = BUF_ZV (b) - BUF_BEGV (b); |
| 12143 | |
| 12144 | if (botpos >= BUF_ZV (b)) |
| 12145 | { |
| 12146 | if (toppos <= BUF_BEGV (b)) |
| 12147 | return "All"; |
| 12148 | else |
| 12149 | return "Bottom"; |
| 12150 | } |
| 12151 | else |
| 12152 | { |
| 12153 | if (total > 1000000) |
| 12154 | /* Do it differently for a large value, to avoid overflow. */ |
| 12155 | total = ((botpos - BUF_BEGV (b)) + (total / 100) - 1) / (total / 100); |
| 12156 | else |
| 12157 | total = ((botpos - BUF_BEGV (b)) * 100 + total - 1) / total; |
| 12158 | /* We can't normally display a 3-digit number, |
| 12159 | so get us a 2-digit number that is close. */ |
| 12160 | if (total == 100) |
| 12161 | total = 99; |
| 12162 | if (toppos <= BUF_BEGV (b)) |
| 12163 | sprintf (decode_mode_spec_buf, "Top%2d%%", total); |
| 12164 | else |
| 12165 | sprintf (decode_mode_spec_buf, "%2d%%", total); |
| 12166 | return decode_mode_spec_buf; |
| 12167 | } |
| 12168 | } |
| 12169 | |
| 12170 | case 's': |
| 12171 | /* status of process */ |
| 12172 | obj = Fget_buffer_process (w->buffer); |
| 12173 | if (NILP (obj)) |
| 12174 | return "no process"; |
| 12175 | #ifdef subprocesses |
| 12176 | obj = Fsymbol_name (Fprocess_status (obj)); |
| 12177 | #endif |
| 12178 | break; |
| 12179 | |
| 12180 | case 't': /* indicate TEXT or BINARY */ |
| 12181 | #ifdef MODE_LINE_BINARY_TEXT |
| 12182 | return MODE_LINE_BINARY_TEXT (b); |
| 12183 | #else |
| 12184 | return "T"; |
| 12185 | #endif |
| 12186 | |
| 12187 | case 'z': |
| 12188 | /* coding-system (not including end-of-line format) */ |
| 12189 | case 'Z': |
| 12190 | /* coding-system (including end-of-line type) */ |
| 12191 | { |
| 12192 | int eol_flag = (c == 'Z'); |
| 12193 | char *p = decode_mode_spec_buf; |
| 12194 | |
| 12195 | if (! FRAME_WINDOW_P (f)) |
| 12196 | { |
| 12197 | /* No need to mention EOL here--the terminal never needs |
| 12198 | to do EOL conversion. */ |
| 12199 | p = decode_mode_spec_coding (keyboard_coding.symbol, p, 0); |
| 12200 | p = decode_mode_spec_coding (terminal_coding.symbol, p, 0); |
| 12201 | } |
| 12202 | p = decode_mode_spec_coding (b->buffer_file_coding_system, |
| 12203 | p, eol_flag); |
| 12204 | |
| 12205 | #if 0 /* This proves to be annoying; I think we can do without. -- rms. */ |
| 12206 | #ifdef subprocesses |
| 12207 | obj = Fget_buffer_process (Fcurrent_buffer ()); |
| 12208 | if (PROCESSP (obj)) |
| 12209 | { |
| 12210 | p = decode_mode_spec_coding (XPROCESS (obj)->decode_coding_system, |
| 12211 | p, eol_flag); |
| 12212 | p = decode_mode_spec_coding (XPROCESS (obj)->encode_coding_system, |
| 12213 | p, eol_flag); |
| 12214 | } |
| 12215 | #endif /* subprocesses */ |
| 12216 | #endif /* 0 */ |
| 12217 | *p = 0; |
| 12218 | return decode_mode_spec_buf; |
| 12219 | } |
| 12220 | } |
| 12221 | |
| 12222 | if (STRINGP (obj)) |
| 12223 | return (char *) XSTRING (obj)->data; |
| 12224 | else |
| 12225 | return ""; |
| 12226 | } |
| 12227 | |
| 12228 | |
| 12229 | /* Count up to COUNT lines starting from START / START_BYTE. |
| 12230 | But don't go beyond LIMIT_BYTE. |
| 12231 | Return the number of lines thus found (always nonnegative). |
| 12232 | |
| 12233 | Set *BYTE_POS_PTR to 1 if we found COUNT lines, 0 if we hit LIMIT. */ |
| 12234 | |
| 12235 | static int |
| 12236 | display_count_lines (start, start_byte, limit_byte, count, byte_pos_ptr) |
| 12237 | int start, start_byte, limit_byte, count; |
| 12238 | int *byte_pos_ptr; |
| 12239 | { |
| 12240 | register unsigned char *cursor; |
| 12241 | unsigned char *base; |
| 12242 | |
| 12243 | register int ceiling; |
| 12244 | register unsigned char *ceiling_addr; |
| 12245 | int orig_count = count; |
| 12246 | |
| 12247 | /* If we are not in selective display mode, |
| 12248 | check only for newlines. */ |
| 12249 | int selective_display = (!NILP (current_buffer->selective_display) |
| 12250 | && !INTEGERP (current_buffer->selective_display)); |
| 12251 | |
| 12252 | if (count > 0) |
| 12253 | { |
| 12254 | while (start_byte < limit_byte) |
| 12255 | { |
| 12256 | ceiling = BUFFER_CEILING_OF (start_byte); |
| 12257 | ceiling = min (limit_byte - 1, ceiling); |
| 12258 | ceiling_addr = BYTE_POS_ADDR (ceiling) + 1; |
| 12259 | base = (cursor = BYTE_POS_ADDR (start_byte)); |
| 12260 | while (1) |
| 12261 | { |
| 12262 | if (selective_display) |
| 12263 | while (*cursor != '\n' && *cursor != 015 && ++cursor != ceiling_addr) |
| 12264 | ; |
| 12265 | else |
| 12266 | while (*cursor != '\n' && ++cursor != ceiling_addr) |
| 12267 | ; |
| 12268 | |
| 12269 | if (cursor != ceiling_addr) |
| 12270 | { |
| 12271 | if (--count == 0) |
| 12272 | { |
| 12273 | start_byte += cursor - base + 1; |
| 12274 | *byte_pos_ptr = start_byte; |
| 12275 | return orig_count; |
| 12276 | } |
| 12277 | else |
| 12278 | if (++cursor == ceiling_addr) |
| 12279 | break; |
| 12280 | } |
| 12281 | else |
| 12282 | break; |
| 12283 | } |
| 12284 | start_byte += cursor - base; |
| 12285 | } |
| 12286 | } |
| 12287 | else |
| 12288 | { |
| 12289 | while (start_byte > limit_byte) |
| 12290 | { |
| 12291 | ceiling = BUFFER_FLOOR_OF (start_byte - 1); |
| 12292 | ceiling = max (limit_byte, ceiling); |
| 12293 | ceiling_addr = BYTE_POS_ADDR (ceiling) - 1; |
| 12294 | base = (cursor = BYTE_POS_ADDR (start_byte - 1) + 1); |
| 12295 | while (1) |
| 12296 | { |
| 12297 | if (selective_display) |
| 12298 | while (--cursor != ceiling_addr |
| 12299 | && *cursor != '\n' && *cursor != 015) |
| 12300 | ; |
| 12301 | else |
| 12302 | while (--cursor != ceiling_addr && *cursor != '\n') |
| 12303 | ; |
| 12304 | |
| 12305 | if (cursor != ceiling_addr) |
| 12306 | { |
| 12307 | if (++count == 0) |
| 12308 | { |
| 12309 | start_byte += cursor - base + 1; |
| 12310 | *byte_pos_ptr = start_byte; |
| 12311 | /* When scanning backwards, we should |
| 12312 | not count the newline posterior to which we stop. */ |
| 12313 | return - orig_count - 1; |
| 12314 | } |
| 12315 | } |
| 12316 | else |
| 12317 | break; |
| 12318 | } |
| 12319 | /* Here we add 1 to compensate for the last decrement |
| 12320 | of CURSOR, which took it past the valid range. */ |
| 12321 | start_byte += cursor - base + 1; |
| 12322 | } |
| 12323 | } |
| 12324 | |
| 12325 | *byte_pos_ptr = limit_byte; |
| 12326 | |
| 12327 | if (count < 0) |
| 12328 | return - orig_count + count; |
| 12329 | return orig_count - count; |
| 12330 | |
| 12331 | } |
| 12332 | |
| 12333 | |
| 12334 | \f |
| 12335 | /*********************************************************************** |
| 12336 | Displaying strings |
| 12337 | ***********************************************************************/ |
| 12338 | |
| 12339 | /* Display a NUL-terminated string, starting with index START. |
| 12340 | |
| 12341 | If STRING is non-null, display that C string. Otherwise, the Lisp |
| 12342 | string LISP_STRING is displayed. |
| 12343 | |
| 12344 | If FACE_STRING is not nil, FACE_STRING_POS is a position in |
| 12345 | FACE_STRING. Display STRING or LISP_STRING with the face at |
| 12346 | FACE_STRING_POS in FACE_STRING: |
| 12347 | |
| 12348 | Display the string in the environment given by IT, but use the |
| 12349 | standard display table, temporarily. |
| 12350 | |
| 12351 | FIELD_WIDTH is the minimum number of output glyphs to produce. |
| 12352 | If STRING has fewer characters than FIELD_WIDTH, pad to the right |
| 12353 | with spaces. If STRING has more characters, more than FIELD_WIDTH |
| 12354 | glyphs will be produced. FIELD_WIDTH <= 0 means don't pad. |
| 12355 | |
| 12356 | PRECISION is the maximum number of characters to output from |
| 12357 | STRING. PRECISION < 0 means don't truncate the string. |
| 12358 | |
| 12359 | This is roughly equivalent to printf format specifiers: |
| 12360 | |
| 12361 | FIELD_WIDTH PRECISION PRINTF |
| 12362 | ---------------------------------------- |
| 12363 | -1 -1 %s |
| 12364 | -1 10 %.10s |
| 12365 | 10 -1 %10s |
| 12366 | 20 10 %20.10s |
| 12367 | |
| 12368 | MULTIBYTE zero means do not display multibyte chars, > 0 means do |
| 12369 | display them, and < 0 means obey the current buffer's value of |
| 12370 | enable_multibyte_characters. |
| 12371 | |
| 12372 | Value is the number of glyphs produced. */ |
| 12373 | |
| 12374 | static int |
| 12375 | display_string (string, lisp_string, face_string, face_string_pos, |
| 12376 | start, it, field_width, precision, max_x, multibyte) |
| 12377 | unsigned char *string; |
| 12378 | Lisp_Object lisp_string; |
| 12379 | Lisp_Object face_string; |
| 12380 | int face_string_pos; |
| 12381 | int start; |
| 12382 | struct it *it; |
| 12383 | int field_width, precision, max_x; |
| 12384 | int multibyte; |
| 12385 | { |
| 12386 | int hpos_at_start = it->hpos; |
| 12387 | int saved_face_id = it->face_id; |
| 12388 | struct glyph_row *row = it->glyph_row; |
| 12389 | |
| 12390 | /* Initialize the iterator IT for iteration over STRING beginning |
| 12391 | with index START. We assume that IT may be modified here (which |
| 12392 | means that display_line has to do something when displaying a |
| 12393 | mini-buffer prompt, which it does). */ |
| 12394 | reseat_to_string (it, string, lisp_string, start, |
| 12395 | precision, field_width, multibyte); |
| 12396 | |
| 12397 | /* If displaying STRING, set up the face of the iterator |
| 12398 | from LISP_STRING, if that's given. */ |
| 12399 | if (STRINGP (face_string)) |
| 12400 | { |
| 12401 | int endptr; |
| 12402 | struct face *face; |
| 12403 | |
| 12404 | it->face_id |
| 12405 | = face_at_string_position (it->w, face_string, face_string_pos, |
| 12406 | 0, it->region_beg_charpos, |
| 12407 | it->region_end_charpos, |
| 12408 | &endptr, it->base_face_id); |
| 12409 | face = FACE_FROM_ID (it->f, it->face_id); |
| 12410 | it->face_box_p = face->box != FACE_NO_BOX; |
| 12411 | } |
| 12412 | |
| 12413 | /* Set max_x to the maximum allowed X position. Don't let it go |
| 12414 | beyond the right edge of the window. */ |
| 12415 | if (max_x <= 0) |
| 12416 | max_x = it->last_visible_x; |
| 12417 | else |
| 12418 | max_x = min (max_x, it->last_visible_x); |
| 12419 | |
| 12420 | /* Skip over display elements that are not visible. because IT->w is |
| 12421 | hscrolled. */ |
| 12422 | if (it->current_x < it->first_visible_x) |
| 12423 | move_it_in_display_line_to (it, 100000, it->first_visible_x, |
| 12424 | MOVE_TO_POS | MOVE_TO_X); |
| 12425 | |
| 12426 | row->ascent = it->max_ascent; |
| 12427 | row->height = it->max_ascent + it->max_descent; |
| 12428 | row->phys_ascent = it->max_phys_ascent; |
| 12429 | row->phys_height = it->max_phys_ascent + it->max_phys_descent; |
| 12430 | |
| 12431 | /* This condition is for the case that we are called with current_x |
| 12432 | past last_visible_x. */ |
| 12433 | while (it->current_x < max_x) |
| 12434 | { |
| 12435 | int x_before, x, n_glyphs_before, i, nglyphs; |
| 12436 | |
| 12437 | /* Get the next display element. */ |
| 12438 | if (!get_next_display_element (it)) |
| 12439 | break; |
| 12440 | |
| 12441 | /* Produce glyphs. */ |
| 12442 | x_before = it->current_x; |
| 12443 | n_glyphs_before = it->glyph_row->used[TEXT_AREA]; |
| 12444 | PRODUCE_GLYPHS (it); |
| 12445 | |
| 12446 | nglyphs = it->glyph_row->used[TEXT_AREA] - n_glyphs_before; |
| 12447 | i = 0; |
| 12448 | x = x_before; |
| 12449 | while (i < nglyphs) |
| 12450 | { |
| 12451 | struct glyph *glyph = row->glyphs[TEXT_AREA] + n_glyphs_before + i; |
| 12452 | |
| 12453 | if (!it->truncate_lines_p |
| 12454 | && x + glyph->pixel_width > max_x) |
| 12455 | { |
| 12456 | /* End of continued line or max_x reached. */ |
| 12457 | it->glyph_row->used[TEXT_AREA] = n_glyphs_before + i; |
| 12458 | it->current_x = x; |
| 12459 | break; |
| 12460 | } |
| 12461 | else if (x + glyph->pixel_width > it->first_visible_x) |
| 12462 | { |
| 12463 | /* Glyph is at least partially visible. */ |
| 12464 | ++it->hpos; |
| 12465 | if (x < it->first_visible_x) |
| 12466 | it->glyph_row->x = x - it->first_visible_x; |
| 12467 | } |
| 12468 | else |
| 12469 | { |
| 12470 | /* Glyph is off the left margin of the display area. |
| 12471 | Should not happen. */ |
| 12472 | abort (); |
| 12473 | } |
| 12474 | |
| 12475 | row->ascent = max (row->ascent, it->max_ascent); |
| 12476 | row->height = max (row->height, it->max_ascent + it->max_descent); |
| 12477 | row->phys_ascent = max (row->phys_ascent, it->max_phys_ascent); |
| 12478 | row->phys_height = max (row->phys_height, |
| 12479 | it->max_phys_ascent + it->max_phys_descent); |
| 12480 | x += glyph->pixel_width; |
| 12481 | ++i; |
| 12482 | } |
| 12483 | |
| 12484 | /* Stop if max_x reached. */ |
| 12485 | if (i < nglyphs) |
| 12486 | break; |
| 12487 | |
| 12488 | /* Stop at line ends. */ |
| 12489 | if (ITERATOR_AT_END_OF_LINE_P (it)) |
| 12490 | { |
| 12491 | it->continuation_lines_width = 0; |
| 12492 | break; |
| 12493 | } |
| 12494 | |
| 12495 | set_iterator_to_next (it); |
| 12496 | |
| 12497 | /* Stop if truncating at the right edge. */ |
| 12498 | if (it->truncate_lines_p |
| 12499 | && it->current_x >= it->last_visible_x) |
| 12500 | { |
| 12501 | /* Add truncation mark, but don't do it if the line is |
| 12502 | truncated at a padding space. */ |
| 12503 | if (IT_CHARPOS (*it) < it->string_nchars) |
| 12504 | { |
| 12505 | if (!FRAME_WINDOW_P (it->f)) |
| 12506 | produce_special_glyphs (it, IT_TRUNCATION); |
| 12507 | it->glyph_row->truncated_on_right_p = 1; |
| 12508 | } |
| 12509 | break; |
| 12510 | } |
| 12511 | } |
| 12512 | |
| 12513 | /* Maybe insert a truncation at the left. */ |
| 12514 | if (it->first_visible_x |
| 12515 | && IT_CHARPOS (*it) > 0) |
| 12516 | { |
| 12517 | if (!FRAME_WINDOW_P (it->f)) |
| 12518 | insert_left_trunc_glyphs (it); |
| 12519 | it->glyph_row->truncated_on_left_p = 1; |
| 12520 | } |
| 12521 | |
| 12522 | it->face_id = saved_face_id; |
| 12523 | |
| 12524 | /* Value is number of columns displayed. */ |
| 12525 | return it->hpos - hpos_at_start; |
| 12526 | } |
| 12527 | |
| 12528 | |
| 12529 | \f |
| 12530 | /* This is like a combination of memq and assq. Return 1 if PROPVAL |
| 12531 | appears as an element of LIST or as the car of an element of LIST. |
| 12532 | If PROPVAL is a list, compare each element against LIST in that |
| 12533 | way, and return 1 if any element of PROPVAL is found in LIST. |
| 12534 | Otherwise return 0. This function cannot quit. */ |
| 12535 | |
| 12536 | int |
| 12537 | invisible_p (propval, list) |
| 12538 | register Lisp_Object propval; |
| 12539 | Lisp_Object list; |
| 12540 | { |
| 12541 | register Lisp_Object tail, proptail; |
| 12542 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 12543 | { |
| 12544 | register Lisp_Object tem; |
| 12545 | tem = XCAR (tail); |
| 12546 | if (EQ (propval, tem)) |
| 12547 | return 1; |
| 12548 | if (CONSP (tem) && EQ (propval, XCAR (tem))) |
| 12549 | return 1; |
| 12550 | } |
| 12551 | if (CONSP (propval)) |
| 12552 | for (proptail = propval; CONSP (proptail); |
| 12553 | proptail = XCDR (proptail)) |
| 12554 | { |
| 12555 | Lisp_Object propelt; |
| 12556 | propelt = XCAR (proptail); |
| 12557 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 12558 | { |
| 12559 | register Lisp_Object tem; |
| 12560 | tem = XCAR (tail); |
| 12561 | if (EQ (propelt, tem)) |
| 12562 | return 1; |
| 12563 | if (CONSP (tem) && EQ (propelt, XCAR (tem))) |
| 12564 | return 1; |
| 12565 | } |
| 12566 | } |
| 12567 | return 0; |
| 12568 | } |
| 12569 | |
| 12570 | |
| 12571 | /* Return 1 if PROPVAL appears as the car of an element of LIST and |
| 12572 | the cdr of that element is non-nil. If PROPVAL is a list, check |
| 12573 | each element of PROPVAL in that way, and the first time some |
| 12574 | element is found, return 1 if the cdr of that element is non-nil. |
| 12575 | Otherwise return 0. This function cannot quit. */ |
| 12576 | |
| 12577 | int |
| 12578 | invisible_ellipsis_p (propval, list) |
| 12579 | register Lisp_Object propval; |
| 12580 | Lisp_Object list; |
| 12581 | { |
| 12582 | register Lisp_Object tail, proptail; |
| 12583 | |
| 12584 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 12585 | { |
| 12586 | register Lisp_Object tem; |
| 12587 | tem = XCAR (tail); |
| 12588 | if (CONSP (tem) && EQ (propval, XCAR (tem))) |
| 12589 | return ! NILP (XCDR (tem)); |
| 12590 | } |
| 12591 | |
| 12592 | if (CONSP (propval)) |
| 12593 | for (proptail = propval; CONSP (proptail); proptail = XCDR (proptail)) |
| 12594 | { |
| 12595 | Lisp_Object propelt; |
| 12596 | propelt = XCAR (proptail); |
| 12597 | for (tail = list; CONSP (tail); tail = XCDR (tail)) |
| 12598 | { |
| 12599 | register Lisp_Object tem; |
| 12600 | tem = XCAR (tail); |
| 12601 | if (CONSP (tem) && EQ (propelt, XCAR (tem))) |
| 12602 | return ! NILP (XCDR (tem)); |
| 12603 | } |
| 12604 | } |
| 12605 | |
| 12606 | return 0; |
| 12607 | } |
| 12608 | |
| 12609 | |
| 12610 | \f |
| 12611 | /*********************************************************************** |
| 12612 | Initialization |
| 12613 | ***********************************************************************/ |
| 12614 | |
| 12615 | void |
| 12616 | syms_of_xdisp () |
| 12617 | { |
| 12618 | Vwith_echo_area_save_vector = Qnil; |
| 12619 | staticpro (&Vwith_echo_area_save_vector); |
| 12620 | |
| 12621 | Vmessage_stack = Qnil; |
| 12622 | staticpro (&Vmessage_stack); |
| 12623 | |
| 12624 | Qinhibit_redisplay = intern ("inhibit-redisplay"); |
| 12625 | staticpro (&Qinhibit_redisplay); |
| 12626 | |
| 12627 | #if GLYPH_DEBUG |
| 12628 | defsubr (&Sdump_glyph_matrix); |
| 12629 | defsubr (&Sdump_glyph_row); |
| 12630 | defsubr (&Sdump_tool_bar_row); |
| 12631 | defsubr (&Strace_redisplay_toggle); |
| 12632 | #endif |
| 12633 | |
| 12634 | staticpro (&Qmenu_bar_update_hook); |
| 12635 | Qmenu_bar_update_hook = intern ("menu-bar-update-hook"); |
| 12636 | |
| 12637 | staticpro (&Qoverriding_terminal_local_map); |
| 12638 | Qoverriding_terminal_local_map = intern ("overriding-terminal-local-map"); |
| 12639 | |
| 12640 | staticpro (&Qoverriding_local_map); |
| 12641 | Qoverriding_local_map = intern ("overriding-local-map"); |
| 12642 | |
| 12643 | staticpro (&Qwindow_scroll_functions); |
| 12644 | Qwindow_scroll_functions = intern ("window-scroll-functions"); |
| 12645 | |
| 12646 | staticpro (&Qredisplay_end_trigger_functions); |
| 12647 | Qredisplay_end_trigger_functions = intern ("redisplay-end-trigger-functions"); |
| 12648 | |
| 12649 | staticpro (&Qinhibit_point_motion_hooks); |
| 12650 | Qinhibit_point_motion_hooks = intern ("inhibit-point-motion-hooks"); |
| 12651 | |
| 12652 | Qdisplay = intern ("display"); |
| 12653 | staticpro (&Qdisplay); |
| 12654 | Qspace_width = intern ("space-width"); |
| 12655 | staticpro (&Qspace_width); |
| 12656 | Qheight = intern ("height"); |
| 12657 | staticpro (&Qheight); |
| 12658 | Qraise = intern ("raise"); |
| 12659 | staticpro (&Qraise); |
| 12660 | Qspace = intern ("space"); |
| 12661 | staticpro (&Qspace); |
| 12662 | Qmargin = intern ("margin"); |
| 12663 | staticpro (&Qmargin); |
| 12664 | Qleft_margin = intern ("left-margin"); |
| 12665 | staticpro (&Qleft_margin); |
| 12666 | Qright_margin = intern ("right-margin"); |
| 12667 | staticpro (&Qright_margin); |
| 12668 | Qalign_to = intern ("align-to"); |
| 12669 | staticpro (&Qalign_to); |
| 12670 | QCalign_to = intern (":align-to"); |
| 12671 | staticpro (&QCalign_to); |
| 12672 | Qwidth = intern ("width"); |
| 12673 | staticpro (&Qwidth); |
| 12674 | Qrelative_width = intern ("relative-width"); |
| 12675 | staticpro (&Qrelative_width); |
| 12676 | QCrelative_width = intern (":relative-width"); |
| 12677 | staticpro (&QCrelative_width); |
| 12678 | QCrelative_height = intern (":relative-height"); |
| 12679 | staticpro (&QCrelative_height); |
| 12680 | QCeval = intern (":eval"); |
| 12681 | staticpro (&QCeval); |
| 12682 | Qwhen = intern ("when"); |
| 12683 | staticpro (&Qwhen); |
| 12684 | QCfile = intern (":file"); |
| 12685 | staticpro (&QCfile); |
| 12686 | Qfontified = intern ("fontified"); |
| 12687 | staticpro (&Qfontified); |
| 12688 | Qfontification_functions = intern ("fontification-functions"); |
| 12689 | staticpro (&Qfontification_functions); |
| 12690 | Qtrailing_whitespace = intern ("trailing-whitespace"); |
| 12691 | staticpro (&Qtrailing_whitespace); |
| 12692 | Qimage = intern ("image"); |
| 12693 | staticpro (&Qimage); |
| 12694 | |
| 12695 | last_arrow_position = Qnil; |
| 12696 | last_arrow_string = Qnil; |
| 12697 | staticpro (&last_arrow_position); |
| 12698 | staticpro (&last_arrow_string); |
| 12699 | |
| 12700 | echo_buffer[0] = echo_buffer[1] = Qnil; |
| 12701 | staticpro (&echo_buffer[0]); |
| 12702 | staticpro (&echo_buffer[1]); |
| 12703 | |
| 12704 | echo_area_buffer[0] = echo_area_buffer[1] = Qnil; |
| 12705 | staticpro (&echo_area_buffer[0]); |
| 12706 | staticpro (&echo_area_buffer[1]); |
| 12707 | |
| 12708 | DEFVAR_LISP ("show-trailing-whitespace", &Vshow_trailing_whitespace, |
| 12709 | "Non-nil means highlight trailing whitespace.\n\ |
| 12710 | The face used for trailing whitespace is `trailing-whitespace'."); |
| 12711 | Vshow_trailing_whitespace = Qnil; |
| 12712 | |
| 12713 | DEFVAR_LISP ("inhibit-redisplay", &Vinhibit_redisplay, |
| 12714 | "Non-nil means don't actually do any redisplay.\n\ |
| 12715 | This is used for internal purposes."); |
| 12716 | Vinhibit_redisplay = Qnil; |
| 12717 | |
| 12718 | DEFVAR_LISP ("global-mode-string", &Vglobal_mode_string, |
| 12719 | "String (or mode line construct) included (normally) in `mode-line-format'."); |
| 12720 | Vglobal_mode_string = Qnil; |
| 12721 | |
| 12722 | DEFVAR_LISP ("overlay-arrow-position", &Voverlay_arrow_position, |
| 12723 | "Marker for where to display an arrow on top of the buffer text.\n\ |
| 12724 | This must be the beginning of a line in order to work.\n\ |
| 12725 | See also `overlay-arrow-string'."); |
| 12726 | Voverlay_arrow_position = Qnil; |
| 12727 | |
| 12728 | DEFVAR_LISP ("overlay-arrow-string", &Voverlay_arrow_string, |
| 12729 | "String to display as an arrow. See also `overlay-arrow-position'."); |
| 12730 | Voverlay_arrow_string = Qnil; |
| 12731 | |
| 12732 | DEFVAR_INT ("scroll-step", &scroll_step, |
| 12733 | "*The number of lines to try scrolling a window by when point moves out.\n\ |
| 12734 | If that fails to bring point back on frame, point is centered instead.\n\ |
| 12735 | If this is zero, point is always centered after it moves off frame."); |
| 12736 | |
| 12737 | DEFVAR_INT ("scroll-conservatively", &scroll_conservatively, |
| 12738 | "*Scroll up to this many lines, to bring point back on screen."); |
| 12739 | scroll_conservatively = 0; |
| 12740 | |
| 12741 | DEFVAR_INT ("scroll-margin", &scroll_margin, |
| 12742 | "*Number of lines of margin at the top and bottom of a window.\n\ |
| 12743 | Recenter the window whenever point gets within this many lines\n\ |
| 12744 | of the top or bottom of the window."); |
| 12745 | scroll_margin = 0; |
| 12746 | |
| 12747 | #if GLYPH_DEBUG |
| 12748 | DEFVAR_INT ("debug-end-pos", &debug_end_pos, "Don't ask"); |
| 12749 | #endif |
| 12750 | |
| 12751 | DEFVAR_BOOL ("truncate-partial-width-windows", |
| 12752 | &truncate_partial_width_windows, |
| 12753 | "*Non-nil means truncate lines in all windows less than full frame wide."); |
| 12754 | truncate_partial_width_windows = 1; |
| 12755 | |
| 12756 | DEFVAR_BOOL ("mode-line-inverse-video", &mode_line_inverse_video, |
| 12757 | "*Non-nil means use inverse video for the mode line."); |
| 12758 | mode_line_inverse_video = 1; |
| 12759 | |
| 12760 | DEFVAR_INT ("line-number-display-limit", &line_number_display_limit, |
| 12761 | "*Maximum buffer size for which line number should be displayed.\n\ |
| 12762 | If the buffer is bigger than this, the line number does not appear\n\ |
| 12763 | in the mode line."); |
| 12764 | line_number_display_limit = 1000000; |
| 12765 | |
| 12766 | DEFVAR_INT ("line-number-display-limit-width", &line_number_display_limit_width, |
| 12767 | "*Maximum line width (in characters) for line number display.\n\ |
| 12768 | If the average length of the lines near point is bigger than this, then the\n\ |
| 12769 | line number may be omitted from the mode line."); |
| 12770 | line_number_display_limit_width = 200; |
| 12771 | |
| 12772 | DEFVAR_BOOL ("highlight-nonselected-windows", &highlight_nonselected_windows, |
| 12773 | "*Non-nil means highlight region even in nonselected windows."); |
| 12774 | highlight_nonselected_windows = 0; |
| 12775 | |
| 12776 | DEFVAR_BOOL ("multiple-frames", &multiple_frames, |
| 12777 | "Non-nil if more than one frame is visible on this display.\n\ |
| 12778 | Minibuffer-only frames don't count, but iconified frames do.\n\ |
| 12779 | This variable is not guaranteed to be accurate except while processing\n\ |
| 12780 | `frame-title-format' and `icon-title-format'."); |
| 12781 | |
| 12782 | DEFVAR_LISP ("frame-title-format", &Vframe_title_format, |
| 12783 | "Template for displaying the title bar of visible frames.\n\ |
| 12784 | \(Assuming the window manager supports this feature.)\n\ |
| 12785 | This variable has the same structure as `mode-line-format' (which see),\n\ |
| 12786 | and is used only on frames for which no explicit name has been set\n\ |
| 12787 | \(see `modify-frame-parameters')."); |
| 12788 | DEFVAR_LISP ("icon-title-format", &Vicon_title_format, |
| 12789 | "Template for displaying the title bar of an iconified frame.\n\ |
| 12790 | \(Assuming the window manager supports this feature.)\n\ |
| 12791 | This variable has the same structure as `mode-line-format' (which see),\n\ |
| 12792 | and is used only on frames for which no explicit name has been set\n\ |
| 12793 | \(see `modify-frame-parameters')."); |
| 12794 | Vicon_title_format |
| 12795 | = Vframe_title_format |
| 12796 | = Fcons (intern ("multiple-frames"), |
| 12797 | Fcons (build_string ("%b"), |
| 12798 | Fcons (Fcons (build_string (""), |
| 12799 | Fcons (intern ("invocation-name"), |
| 12800 | Fcons (build_string ("@"), |
| 12801 | Fcons (intern ("system-name"), |
| 12802 | Qnil)))), |
| 12803 | Qnil))); |
| 12804 | |
| 12805 | DEFVAR_LISP ("message-log-max", &Vmessage_log_max, |
| 12806 | "Maximum number of lines to keep in the message log buffer.\n\ |
| 12807 | If nil, disable message logging. If t, log messages but don't truncate\n\ |
| 12808 | the buffer when it becomes large."); |
| 12809 | XSETFASTINT (Vmessage_log_max, 50); |
| 12810 | |
| 12811 | DEFVAR_LISP ("window-size-change-functions", &Vwindow_size_change_functions, |
| 12812 | "Functions called before redisplay, if window sizes have changed.\n\ |
| 12813 | The value should be a list of functions that take one argument.\n\ |
| 12814 | Just before redisplay, for each frame, if any of its windows have changed\n\ |
| 12815 | size since the last redisplay, or have been split or deleted,\n\ |
| 12816 | all the functions in the list are called, with the frame as argument."); |
| 12817 | Vwindow_size_change_functions = Qnil; |
| 12818 | |
| 12819 | DEFVAR_LISP ("window-scroll-functions", &Vwindow_scroll_functions, |
| 12820 | "List of Functions to call before redisplaying a window with scrolling.\n\ |
| 12821 | Each function is called with two arguments, the window\n\ |
| 12822 | and its new display-start position. Note that the value of `window-end'\n\ |
| 12823 | is not valid when these functions are called."); |
| 12824 | Vwindow_scroll_functions = Qnil; |
| 12825 | |
| 12826 | DEFVAR_BOOL ("auto-resize-tool-bars", &auto_resize_tool_bars_p, |
| 12827 | "*Non-nil means automatically resize tool-bars.\n\ |
| 12828 | This increases a tool-bar's height if not all tool-bar items are visible.\n\ |
| 12829 | It decreases a tool-bar's height when it would display blank lines\n\ |
| 12830 | otherwise."); |
| 12831 | auto_resize_tool_bars_p = 1; |
| 12832 | |
| 12833 | DEFVAR_BOOL ("auto-raise-tool-bar-buttons", &auto_raise_tool_bar_buttons_p, |
| 12834 | "*Non-nil means raise tool-bar buttons when the mouse moves over them."); |
| 12835 | auto_raise_tool_bar_buttons_p = 1; |
| 12836 | |
| 12837 | DEFVAR_INT ("tool-bar-button-margin", &tool_bar_button_margin, |
| 12838 | "*Margin around tool-bar buttons in pixels."); |
| 12839 | tool_bar_button_margin = 1; |
| 12840 | |
| 12841 | DEFVAR_INT ("tool-bar-button-relief", &tool_bar_button_relief, |
| 12842 | "Relief thickness of tool-bar buttons."); |
| 12843 | tool_bar_button_relief = 3; |
| 12844 | |
| 12845 | DEFVAR_LISP ("fontification-functions", &Vfontification_functions, |
| 12846 | "List of functions to call to fontify regions of text.\n\ |
| 12847 | Each function is called with one argument POS. Functions must\n\ |
| 12848 | fontify a region starting at POS in the current buffer, and give\n\ |
| 12849 | fontified regions the property `fontified'.\n\ |
| 12850 | This variable automatically becomes buffer-local when set."); |
| 12851 | Vfontification_functions = Qnil; |
| 12852 | Fmake_local_variable (Qfontification_functions); |
| 12853 | |
| 12854 | DEFVAR_BOOL ("unibyte-display-via-language-environment", |
| 12855 | &unibyte_display_via_language_environment, |
| 12856 | "*Non-nil means display unibyte text according to language environment.\n\ |
| 12857 | Specifically this means that unibyte non-ASCII characters\n\ |
| 12858 | are displayed by converting them to the equivalent multibyte characters\n\ |
| 12859 | according to the current language environment. As a result, they are\n\ |
| 12860 | displayed according to the current fontset."); |
| 12861 | unibyte_display_via_language_environment = 0; |
| 12862 | |
| 12863 | DEFVAR_LISP ("max-mini-window-height", &Vmax_mini_window_height, |
| 12864 | "*Maximum height for resizing mini-windows.\n\ |
| 12865 | If a float, it specifies a fraction of the mini-window frame's height.\n\ |
| 12866 | If an integer, it specifies a number of lines.\n\ |
| 12867 | If nil, don't resize."); |
| 12868 | Vmax_mini_window_height = make_float (0.25); |
| 12869 | } |
| 12870 | |
| 12871 | |
| 12872 | /* Initialize this module when Emacs starts. */ |
| 12873 | |
| 12874 | void |
| 12875 | init_xdisp () |
| 12876 | { |
| 12877 | Lisp_Object root_window; |
| 12878 | struct window *mini_w; |
| 12879 | |
| 12880 | CHARPOS (this_line_start_pos) = 0; |
| 12881 | |
| 12882 | mini_w = XWINDOW (minibuf_window); |
| 12883 | root_window = FRAME_ROOT_WINDOW (XFRAME (WINDOW_FRAME (mini_w))); |
| 12884 | |
| 12885 | if (!noninteractive) |
| 12886 | { |
| 12887 | struct frame *f = XFRAME (WINDOW_FRAME (XWINDOW (root_window))); |
| 12888 | int i; |
| 12889 | |
| 12890 | XSETFASTINT (XWINDOW (root_window)->top, FRAME_TOP_MARGIN (f)); |
| 12891 | set_window_height (root_window, |
| 12892 | FRAME_HEIGHT (f) - 1 - FRAME_TOP_MARGIN (f), |
| 12893 | 0); |
| 12894 | XSETFASTINT (mini_w->top, FRAME_HEIGHT (f) - 1); |
| 12895 | set_window_height (minibuf_window, 1, 0); |
| 12896 | |
| 12897 | XSETFASTINT (XWINDOW (root_window)->width, FRAME_WIDTH (f)); |
| 12898 | XSETFASTINT (mini_w->width, FRAME_WIDTH (f)); |
| 12899 | |
| 12900 | scratch_glyph_row.glyphs[TEXT_AREA] = scratch_glyphs; |
| 12901 | scratch_glyph_row.glyphs[TEXT_AREA + 1] |
| 12902 | = scratch_glyphs + MAX_SCRATCH_GLYPHS; |
| 12903 | |
| 12904 | /* The default ellipsis glyphs `...'. */ |
| 12905 | for (i = 0; i < 3; ++i) |
| 12906 | XSETFASTINT (default_invis_vector[i], '.'); |
| 12907 | } |
| 12908 | |
| 12909 | #ifdef HAVE_WINDOW_SYSTEM |
| 12910 | { |
| 12911 | /* Allocate the buffer for frame titles. */ |
| 12912 | int size = 100; |
| 12913 | frame_title_buf = (char *) xmalloc (size); |
| 12914 | frame_title_buf_end = frame_title_buf + size; |
| 12915 | frame_title_ptr = NULL; |
| 12916 | } |
| 12917 | #endif /* HAVE_WINDOW_SYSTEM */ |
| 12918 | } |
| 12919 | |
| 12920 | |