| 1 | /* Updating of data structures for redisplay. |
| 2 | Copyright (C) 1985, 1986, 1987, 1988, 1990 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 1, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | |
| 21 | #include <signal.h> |
| 22 | |
| 23 | #include "config.h" |
| 24 | #include <stdio.h> |
| 25 | #include <ctype.h> |
| 26 | |
| 27 | #include "termchar.h" |
| 28 | #include "termopts.h" |
| 29 | #include "cm.h" |
| 30 | #include "lisp.h" |
| 31 | #include "dispextern.h" |
| 32 | #include "buffer.h" |
| 33 | #include "screen.h" |
| 34 | #include "window.h" |
| 35 | #include "commands.h" |
| 36 | #include "disptab.h" |
| 37 | #include "indent.h" |
| 38 | |
| 39 | #include "systerm.h" |
| 40 | #include "systime.h" |
| 41 | |
| 42 | #ifdef HAVE_X_WINDOWS |
| 43 | #include "xterm.h" |
| 44 | #endif /* HAVE_X_WINDOWS */ |
| 45 | |
| 46 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
| 47 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
| 48 | |
| 49 | #ifndef PENDING_OUTPUT_COUNT |
| 50 | /* Get number of chars of output now in the buffer of a stdio stream. |
| 51 | This ought to be built in in stdio, but it isn't. |
| 52 | Some s- files override this because their stdio internals differ. */ |
| 53 | #define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_ptr - (FILE)->_base) |
| 54 | #endif |
| 55 | |
| 56 | /* Nonzero upon entry to redisplay means do not assume anything about |
| 57 | current contents of actual terminal screen; clear and redraw it. */ |
| 58 | |
| 59 | int screen_garbaged; |
| 60 | |
| 61 | /* Nonzero means last display completed. Zero means it was preempted. */ |
| 62 | |
| 63 | int display_completed; |
| 64 | |
| 65 | /* Lisp variable visible-bell; enables use of screen-flash |
| 66 | instead of audible bell. */ |
| 67 | |
| 68 | int visible_bell; |
| 69 | |
| 70 | /* Invert the color of the whole screen, at a low level. */ |
| 71 | |
| 72 | int inverse_video; |
| 73 | |
| 74 | /* Line speed of the terminal. */ |
| 75 | |
| 76 | int baud_rate; |
| 77 | |
| 78 | /* nil or a symbol naming the window system under which emacs is |
| 79 | running ('x is the only current possibility). */ |
| 80 | |
| 81 | Lisp_Object Vwindow_system; |
| 82 | |
| 83 | /* Version number of X windows: 10, 11 or nil. */ |
| 84 | Lisp_Object Vwindow_system_version; |
| 85 | |
| 86 | /* Vector of glyph definitions. Indexed by glyph number, |
| 87 | the contents are a string which is how to output the glyph. |
| 88 | |
| 89 | If Vglyph_table is nil, a glyph is output by using its low 8 bits |
| 90 | as a character code. */ |
| 91 | |
| 92 | Lisp_Object Vglyph_table; |
| 93 | |
| 94 | /* Display table to use for vectors that don't specify their own. */ |
| 95 | |
| 96 | Lisp_Object Vstandard_display_table; |
| 97 | |
| 98 | /* Nonzero means reading single-character input with prompt |
| 99 | so put cursor on minibuffer after the prompt. */ |
| 100 | |
| 101 | int cursor_in_echo_area; |
| 102 | \f |
| 103 | /* The currently selected screen. |
| 104 | In a single-screen version, this variable always remains 0. */ |
| 105 | |
| 106 | SCREEN_PTR selected_screen; |
| 107 | |
| 108 | /* In a single-screen version, the information that would otherwise |
| 109 | exist inside a `struct screen' lives in the following variables instead. */ |
| 110 | |
| 111 | #ifndef MULTI_SCREEN |
| 112 | |
| 113 | /* Desired terminal cursor position (to show position of point), |
| 114 | origin zero */ |
| 115 | |
| 116 | int cursX, cursY; |
| 117 | |
| 118 | /* Description of current screen contents */ |
| 119 | |
| 120 | struct screen_glyphs *current_glyphs; |
| 121 | |
| 122 | /* Description of desired screen contents */ |
| 123 | |
| 124 | struct screen_glyphs *desired_glyphs; |
| 125 | |
| 126 | #endif /* not MULTI_SCREEN */ |
| 127 | |
| 128 | /* This is a vector, made larger whenever it isn't large enough, |
| 129 | which is used inside `update_screen' to hold the old contents |
| 130 | of the SCREEN_PHYS_LINES of the screen being updated. */ |
| 131 | struct screen_glyphs **ophys_lines; |
| 132 | /* Length of vector currently allocated. */ |
| 133 | int ophys_lines_length; |
| 134 | |
| 135 | FILE *termscript; /* Stdio stream being used for copy of all output. */ |
| 136 | |
| 137 | struct cm Wcm; /* Structure for info on cursor positioning */ |
| 138 | |
| 139 | extern short ospeed; /* Output speed (from sg_ospeed) */ |
| 140 | |
| 141 | int in_display; /* 1 if in redisplay: can't handle SIGWINCH now. */ |
| 142 | |
| 143 | int delayed_size_change; /* 1 means SIGWINCH happened when not safe. */ |
| 144 | int delayed_screen_height; /* Remembered new screen height. */ |
| 145 | int delayed_screen_width; /* Remembered new screen width. */ |
| 146 | \f |
| 147 | #ifdef MULTI_SCREEN |
| 148 | |
| 149 | DEFUN ("redraw-screen", Fredraw_screen, Sredraw_screen, 1, 1, 0, |
| 150 | "Clear screen SCREEN and output again what is supposed to appear on it.") |
| 151 | (screen) |
| 152 | Lisp_Object screen; |
| 153 | { |
| 154 | SCREEN_PTR s; |
| 155 | |
| 156 | CHECK_LIVE_SCREEN (screen, 0); |
| 157 | s = XSCREEN (screen); |
| 158 | update_begin (s); |
| 159 | /* set_terminal_modes (); */ |
| 160 | clear_screen (); |
| 161 | update_end (s); |
| 162 | fflush (stdout); |
| 163 | clear_screen_records (s); |
| 164 | windows_or_buffers_changed++; |
| 165 | /* Mark all windows as INaccurate, |
| 166 | so that every window will have its redisplay done. */ |
| 167 | mark_window_display_accurate (SCREEN_ROOT_WINDOW (s), 0); |
| 168 | s->garbaged = 0; |
| 169 | return Qnil; |
| 170 | } |
| 171 | |
| 172 | DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, "", |
| 173 | "Redraw all screens marked as having their images garbled.") |
| 174 | () |
| 175 | { |
| 176 | Lisp_Object screen, tail; |
| 177 | |
| 178 | for (tail = Vscreen_list; CONSP (tail); tail = XCONS (tail)->cdr) |
| 179 | { |
| 180 | screen = XCONS (tail)->car; |
| 181 | if (XSCREEN (screen)->garbaged && XSCREEN (screen)->visible) |
| 182 | Fredraw_screen (screen); |
| 183 | } |
| 184 | return Qnil; |
| 185 | } |
| 186 | |
| 187 | redraw_screen (s) |
| 188 | SCREEN_PTR s; |
| 189 | { |
| 190 | Lisp_Object screen; |
| 191 | XSET (screen, Lisp_Screen, s); |
| 192 | Fredraw_screen (screen); |
| 193 | } |
| 194 | |
| 195 | #else /* not MULTI_SCREEN */ |
| 196 | |
| 197 | DEFUN ("redraw-display", Fredraw_display, Sredraw_display, 0, 0, 0, |
| 198 | "Clear screen and output again what is supposed to appear on it.") |
| 199 | () |
| 200 | { |
| 201 | update_begin (0); |
| 202 | set_terminal_modes (); |
| 203 | clear_screen (); |
| 204 | update_end (0); |
| 205 | fflush (stdout); |
| 206 | clear_screen_records (0); |
| 207 | windows_or_buffers_changed++; |
| 208 | /* Mark all windows as INaccurate, |
| 209 | so that every window will have its redisplay done. */ |
| 210 | mark_window_display_accurate (XWINDOW (minibuf_window)->prev, 0); |
| 211 | return Qnil; |
| 212 | } |
| 213 | |
| 214 | #endif /* not MULTI_SCREEN */ |
| 215 | \f |
| 216 | static struct screen_glyphs * |
| 217 | make_screen_glyphs (screen, empty) |
| 218 | register SCREEN_PTR screen; |
| 219 | int empty; |
| 220 | { |
| 221 | register int i; |
| 222 | register width = SCREEN_WIDTH (screen); |
| 223 | register height = SCREEN_HEIGHT (screen); |
| 224 | register struct screen_glyphs *new = |
| 225 | (struct screen_glyphs *) xmalloc (sizeof (struct screen_glyphs)); |
| 226 | |
| 227 | SET_GLYPHS_SCREEN (new, screen); |
| 228 | new->height = height; |
| 229 | new->width = width; |
| 230 | new->used = (int *) xmalloc (height * sizeof (int)); |
| 231 | new->glyphs = (GLYPH **) xmalloc (height * sizeof (GLYPH *)); |
| 232 | new->highlight = (char *) xmalloc (height * sizeof (char)); |
| 233 | new->enable = (char *) xmalloc (height * sizeof (char)); |
| 234 | bzero (new->enable, height * sizeof (char)); |
| 235 | new->bufp = (int *) xmalloc (height * sizeof (int)); |
| 236 | |
| 237 | #ifdef HAVE_X_WINDOWS |
| 238 | if (SCREEN_IS_X (screen)) |
| 239 | { |
| 240 | new->nruns = (int *) xmalloc (height * sizeof (int)); |
| 241 | new->face_list |
| 242 | = (struct run **) xmalloc (height * sizeof (struct run *)); |
| 243 | new->top_left_x = (short *) xmalloc (height * sizeof (short)); |
| 244 | new->top_left_y = (short *) xmalloc (height * sizeof (short)); |
| 245 | new->pix_width = (short *) xmalloc (height * sizeof (short)); |
| 246 | new->pix_height = (short *) xmalloc (height * sizeof (short)); |
| 247 | } |
| 248 | #endif |
| 249 | |
| 250 | if (empty) |
| 251 | { |
| 252 | /* Make the buffer used by decode_mode_spec. This buffer is also |
| 253 | used as temporary storage when updating the screen. See scroll.c. */ |
| 254 | unsigned int total_glyphs = (width + 2) * sizeof (GLYPH); |
| 255 | |
| 256 | new->total_contents = (GLYPH *) xmalloc (total_glyphs); |
| 257 | bzero (new->total_contents, total_glyphs); |
| 258 | } |
| 259 | else |
| 260 | { |
| 261 | unsigned int total_glyphs = height * (width + 2) * sizeof (GLYPH); |
| 262 | |
| 263 | new->total_contents = (GLYPH *) xmalloc (total_glyphs); |
| 264 | bzero (new->total_contents, total_glyphs); |
| 265 | for (i = 0; i < height; i++) |
| 266 | new->glyphs[i] = new->total_contents + i * (width + 2) + 1; |
| 267 | } |
| 268 | |
| 269 | return new; |
| 270 | } |
| 271 | |
| 272 | static void |
| 273 | free_screen_glyphs (screen, glyphs) |
| 274 | SCREEN_PTR screen; |
| 275 | struct screen_glyphs *glyphs; |
| 276 | { |
| 277 | if (glyphs->total_contents) |
| 278 | free (glyphs->total_contents); |
| 279 | |
| 280 | free (glyphs->used); |
| 281 | free (glyphs->glyphs); |
| 282 | free (glyphs->highlight); |
| 283 | free (glyphs->enable); |
| 284 | free (glyphs->bufp); |
| 285 | |
| 286 | #ifdef HAVE_X_WINDOWS |
| 287 | if (SCREEN_IS_X (screen)) |
| 288 | { |
| 289 | free (glyphs->nruns); |
| 290 | free (glyphs->face_list); |
| 291 | free (glyphs->top_left_x); |
| 292 | free (glyphs->top_left_y); |
| 293 | free (glyphs->pix_width); |
| 294 | free (glyphs->pix_height); |
| 295 | } |
| 296 | #endif |
| 297 | |
| 298 | free (glyphs); |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | remake_screen_glyphs (screen) |
| 303 | SCREEN_PTR screen; |
| 304 | { |
| 305 | if (SCREEN_CURRENT_GLYPHS (screen)) |
| 306 | free_screen_glyphs (screen, SCREEN_CURRENT_GLYPHS (screen)); |
| 307 | if (SCREEN_DESIRED_GLYPHS (screen)) |
| 308 | free_screen_glyphs (screen, SCREEN_DESIRED_GLYPHS (screen)); |
| 309 | if (SCREEN_TEMP_GLYPHS (screen)) |
| 310 | free_screen_glyphs (screen, SCREEN_TEMP_GLYPHS (screen)); |
| 311 | |
| 312 | if (SCREEN_MESSAGE_BUF (screen)) |
| 313 | SCREEN_MESSAGE_BUF (screen) |
| 314 | = (char *) xrealloc (SCREEN_MESSAGE_BUF (screen), |
| 315 | SCREEN_WIDTH (screen) + 1); |
| 316 | else |
| 317 | SCREEN_MESSAGE_BUF (screen) |
| 318 | = (char *) xmalloc (SCREEN_WIDTH (screen) + 1); |
| 319 | |
| 320 | SCREEN_CURRENT_GLYPHS (screen) = make_screen_glyphs (screen, 0); |
| 321 | SCREEN_DESIRED_GLYPHS (screen) = make_screen_glyphs (screen, 0); |
| 322 | SCREEN_TEMP_GLYPHS (screen) = make_screen_glyphs (screen, 1); |
| 323 | SET_SCREEN_GARBAGED (screen); |
| 324 | } |
| 325 | \f |
| 326 | /* Return the hash code of contents of line VPOS in screen-matrix M. */ |
| 327 | |
| 328 | static int |
| 329 | line_hash_code (m, vpos) |
| 330 | register struct screen_glyphs *m; |
| 331 | int vpos; |
| 332 | { |
| 333 | register GLYPH *body, *end; |
| 334 | register int h = 0; |
| 335 | |
| 336 | if (!m->enable[vpos]) |
| 337 | return 0; |
| 338 | |
| 339 | /* Give all lighlighted lines the same hash code |
| 340 | so as to encourage scrolling to leave them in place. */ |
| 341 | if (m->highlight[vpos]) |
| 342 | return -1; |
| 343 | |
| 344 | body = m->glyphs[vpos]; |
| 345 | |
| 346 | if (must_write_spaces) |
| 347 | while (1) |
| 348 | { |
| 349 | GLYPH g = *body++; |
| 350 | |
| 351 | if (g == 0) |
| 352 | break; |
| 353 | h = (((h << 4) + (h >> 24)) & 0x0fffffff) + g - SPACEGLYPH; |
| 354 | } |
| 355 | else |
| 356 | while (1) |
| 357 | { |
| 358 | GLYPH g = *body++; |
| 359 | |
| 360 | if (g == 0) |
| 361 | break; |
| 362 | h = (((h << 4) + (h >> 24)) & 0x0fffffff) + g; |
| 363 | } |
| 364 | |
| 365 | if (h) |
| 366 | return h; |
| 367 | return 1; |
| 368 | } |
| 369 | |
| 370 | /* Return number of characters in line in M at vpos VPOS, |
| 371 | except don't count leading and trailing spaces |
| 372 | unless the terminal requires those to be explicitly output. */ |
| 373 | |
| 374 | static unsigned int |
| 375 | line_draw_cost (m, vpos) |
| 376 | struct screen_glyphs *m; |
| 377 | int vpos; |
| 378 | { |
| 379 | register GLYPH *beg = m->glyphs[vpos]; |
| 380 | register GLYPH *end = m->glyphs[vpos] + m->used[vpos]; |
| 381 | register int i; |
| 382 | register int tlen = GLYPH_TABLE_LENGTH; |
| 383 | register Lisp_Object *tbase = GLYPH_TABLE_BASE; |
| 384 | |
| 385 | /* Ignore trailing and leading spaces if we can. */ |
| 386 | if (!must_write_spaces) |
| 387 | { |
| 388 | while ((end != beg) && (*end == SPACEGLYPH)) |
| 389 | --end; |
| 390 | if (end == beg) |
| 391 | return (0); /* All blank line. */ |
| 392 | |
| 393 | while (*beg == SPACEGLYPH) |
| 394 | ++beg; |
| 395 | } |
| 396 | |
| 397 | /* If we don't have a glyph-table, each glyph is one character, |
| 398 | so return the number of glyphs. */ |
| 399 | if (tbase == 0) |
| 400 | return end - beg; |
| 401 | |
| 402 | /* Otherwise, scan the glyphs and accumulate their total size in I. */ |
| 403 | i = 0; |
| 404 | while ((beg <= end) && *beg) |
| 405 | { |
| 406 | register GLYPH g = *beg++; |
| 407 | |
| 408 | if (GLYPH_SIMPLE_P (tbase, tlen, g)) |
| 409 | i += 1; |
| 410 | else |
| 411 | i += GLYPH_LENGTH (tbase, g); |
| 412 | } |
| 413 | return i; |
| 414 | } |
| 415 | \f |
| 416 | /* The functions on this page are the interface from xdisp.c to redisplay. |
| 417 | |
| 418 | The only other interface into redisplay is through setting |
| 419 | SCREEN_CURSOR_X (screen) and SCREEN_CURSOR_Y (screen) |
| 420 | and SET_SCREEN_GARBAGED (screen). */ |
| 421 | |
| 422 | /* cancel_line eliminates any request to display a line at position `vpos' */ |
| 423 | |
| 424 | cancel_line (vpos, screen) |
| 425 | int vpos; |
| 426 | register SCREEN_PTR screen; |
| 427 | { |
| 428 | SCREEN_DESIRED_GLYPHS (screen)->enable[vpos] = 0; |
| 429 | } |
| 430 | |
| 431 | clear_screen_records (screen) |
| 432 | register SCREEN_PTR screen; |
| 433 | { |
| 434 | bzero (SCREEN_CURRENT_GLYPHS (screen)->enable, SCREEN_HEIGHT (screen)); |
| 435 | } |
| 436 | |
| 437 | /* Prepare to display on line VPOS starting at HPOS within it. */ |
| 438 | |
| 439 | void |
| 440 | get_display_line (screen, vpos, hpos) |
| 441 | register SCREEN_PTR screen; |
| 442 | int vpos; |
| 443 | register int hpos; |
| 444 | { |
| 445 | register struct screen_glyphs *glyphs; |
| 446 | register struct screen_glyphs *desired_glyphs = SCREEN_DESIRED_GLYPHS (screen); |
| 447 | register GLYPH *p; |
| 448 | |
| 449 | if (vpos < 0 || (! SCREEN_VISIBLE_P (screen))) |
| 450 | abort (); |
| 451 | |
| 452 | if ((desired_glyphs->enable[vpos]) && desired_glyphs->used[vpos] > hpos) |
| 453 | abort (); |
| 454 | |
| 455 | if (! desired_glyphs->enable[vpos]) |
| 456 | { |
| 457 | desired_glyphs->used[vpos] = 0; |
| 458 | desired_glyphs->highlight[vpos] = 0; |
| 459 | desired_glyphs->enable[vpos] = 1; |
| 460 | } |
| 461 | |
| 462 | if (hpos > desired_glyphs->used[vpos]) |
| 463 | { |
| 464 | GLYPH *g = desired_glyphs->glyphs[vpos] + desired_glyphs->used[vpos]; |
| 465 | GLYPH *end = desired_glyphs->glyphs[vpos] + hpos; |
| 466 | |
| 467 | desired_glyphs->used[vpos] = hpos; |
| 468 | while (g != end) |
| 469 | *g++ = SPACEGLYPH; |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /* Like bcopy except never gets confused by overlap. */ |
| 474 | |
| 475 | void |
| 476 | safe_bcopy (from, to, size) |
| 477 | char *from, *to; |
| 478 | int size; |
| 479 | { |
| 480 | register char *endf; |
| 481 | register char *endt; |
| 482 | |
| 483 | if (size == 0) |
| 484 | return; |
| 485 | |
| 486 | /* If destination is higher in memory, and overlaps source zone, |
| 487 | copy from the end. */ |
| 488 | if (from < to && from + size > to) |
| 489 | { |
| 490 | endf = from + size; |
| 491 | endt = to + size; |
| 492 | |
| 493 | /* If TO - FROM is large, then we should break the copy into |
| 494 | nonoverlapping chunks of TO - FROM bytes each. However, if |
| 495 | TO - FROM is small, then the bcopy function call overhead |
| 496 | makes this not worth it. The crossover point could be about |
| 497 | anywhere. Since I don't think the obvious copy loop is ever |
| 498 | too bad, I'm trying to err in its favor. */ |
| 499 | if (to - from < 64) |
| 500 | { |
| 501 | do |
| 502 | *--endt = *--endf; |
| 503 | while (endf != from); |
| 504 | } |
| 505 | else |
| 506 | { |
| 507 | /* Since TO - FROM >= 64, the overlap is less than SIZE, |
| 508 | so we can always safely do this loop once. */ |
| 509 | while (endt > to) |
| 510 | { |
| 511 | endt -= (to - from); |
| 512 | endf -= (to - from); |
| 513 | |
| 514 | bcopy (endf, endt, to - from); |
| 515 | } |
| 516 | |
| 517 | /* If TO - FROM wasn't a multiple of SIZE, there will be a |
| 518 | little left over. The amount left over is |
| 519 | (endt + (to - from)) - to, which is endt - from. */ |
| 520 | bcopy (from, to, endt - from); |
| 521 | } |
| 522 | } |
| 523 | else |
| 524 | bcopy (from, to, size); |
| 525 | } |
| 526 | |
| 527 | #if 0 |
| 528 | void |
| 529 | safe_bcopy (from, to, size) |
| 530 | char *from, *to; |
| 531 | int size; |
| 532 | { |
| 533 | register char *endf; |
| 534 | register char *endt; |
| 535 | |
| 536 | if (size == 0) |
| 537 | return; |
| 538 | |
| 539 | /* If destination is higher in memory, and overlaps source zone, |
| 540 | copy from the end. */ |
| 541 | if (from < to && from + size > to) |
| 542 | { |
| 543 | endf = from + size; |
| 544 | endt = to + size; |
| 545 | |
| 546 | do |
| 547 | *--endt = *--endf; |
| 548 | while (endf != from); |
| 549 | |
| 550 | return; |
| 551 | } |
| 552 | |
| 553 | bcopy (from, to, size); |
| 554 | } |
| 555 | #endif |
| 556 | |
| 557 | /* Rotate a vector of SIZE bytes right, by DISTANCE bytes. |
| 558 | DISTANCE may be negative. */ |
| 559 | |
| 560 | static void |
| 561 | rotate_vector (vector, size, distance) |
| 562 | char *vector; |
| 563 | int size; |
| 564 | int distance; |
| 565 | { |
| 566 | char *temp = (char *) alloca (size); |
| 567 | |
| 568 | if (distance < 0) |
| 569 | distance += size; |
| 570 | |
| 571 | bcopy (vector, temp + distance, size - distance); |
| 572 | bcopy (vector + size - distance, temp, distance); |
| 573 | bcopy (temp, vector, size); |
| 574 | } |
| 575 | |
| 576 | /* Scroll lines from vpos FROM up to but not including vpos END |
| 577 | down by AMOUNT lines (AMOUNT may be negative). |
| 578 | Returns nonzero if done, zero if terminal cannot scroll them. */ |
| 579 | |
| 580 | int |
| 581 | scroll_screen_lines (screen, from, end, amount) |
| 582 | register SCREEN_PTR screen; |
| 583 | int from, end, amount; |
| 584 | { |
| 585 | register int i; |
| 586 | register struct screen_glyphs *current_screen |
| 587 | = SCREEN_CURRENT_GLYPHS (screen); |
| 588 | |
| 589 | if (!line_ins_del_ok) |
| 590 | return 0; |
| 591 | |
| 592 | if (amount == 0) |
| 593 | return 1; |
| 594 | |
| 595 | if (amount > 0) |
| 596 | { |
| 597 | update_begin (screen); |
| 598 | set_terminal_window (end + amount); |
| 599 | if (!scroll_region_ok) |
| 600 | ins_del_lines (end, -amount); |
| 601 | ins_del_lines (from, amount); |
| 602 | set_terminal_window (0); |
| 603 | |
| 604 | rotate_vector (current_screen->glyphs + from, |
| 605 | sizeof (GLYPH *) * (end + amount - from), |
| 606 | amount * sizeof (GLYPH *)); |
| 607 | |
| 608 | safe_bcopy (current_screen->used + from, |
| 609 | current_screen->used + from + amount, |
| 610 | (end - from) * sizeof current_screen->used[0]); |
| 611 | |
| 612 | safe_bcopy (current_screen->highlight + from, |
| 613 | current_screen->highlight + from + amount, |
| 614 | (end - from) * sizeof current_screen->highlight[0]); |
| 615 | |
| 616 | safe_bcopy (current_screen->enable + from, |
| 617 | current_screen->enable + from + amount, |
| 618 | (end - from) * sizeof current_screen->enable[0]); |
| 619 | |
| 620 | /* Mark the lines made empty by scrolling as enabled, empty and |
| 621 | normal video. */ |
| 622 | bzero (current_screen->used + from, |
| 623 | amount * sizeof current_screen->used[0]); |
| 624 | bzero (current_screen->highlight + from, |
| 625 | amount * sizeof current_screen->highlight[0]); |
| 626 | for (i = from; i < from + amount; i++) |
| 627 | { |
| 628 | current_screen->glyphs[i][0] = '\0'; |
| 629 | current_screen->enable[i] = 1; |
| 630 | } |
| 631 | |
| 632 | safe_bcopy (current_screen->bufp + from, |
| 633 | current_screen->bufp + from + amount, |
| 634 | (end - from) * sizeof current_screen->bufp[0]); |
| 635 | |
| 636 | #ifdef HAVE_X_WINDOWS |
| 637 | if (SCREEN_IS_X (screen)) |
| 638 | { |
| 639 | safe_bcopy (current_screen->nruns + from, |
| 640 | current_screen->nruns + from + amount, |
| 641 | (end - from) * sizeof current_screen->nruns[0]); |
| 642 | |
| 643 | safe_bcopy (current_screen->face_list + from, |
| 644 | current_screen->face_list + from + amount, |
| 645 | (end - from) * sizeof current_screen->face_list[0]); |
| 646 | |
| 647 | safe_bcopy (current_screen->top_left_x + from, |
| 648 | current_screen->top_left_x + from + amount, |
| 649 | (end - from) * sizeof current_screen->top_left_x[0]); |
| 650 | |
| 651 | safe_bcopy (current_screen->top_left_y + from, |
| 652 | current_screen->top_left_y + from + amount, |
| 653 | (end - from) * sizeof current_screen->top_left_y[0]); |
| 654 | |
| 655 | safe_bcopy (current_screen->pix_width + from, |
| 656 | current_screen->pix_width + from + amount, |
| 657 | (end - from) * sizeof current_screen->pix_width[0]); |
| 658 | |
| 659 | safe_bcopy (current_screen->pix_height + from, |
| 660 | current_screen->pix_height + from + amount, |
| 661 | (end - from) * sizeof current_screen->pix_height[0]); |
| 662 | } |
| 663 | #endif /* HAVE_X_WINDOWS */ |
| 664 | |
| 665 | update_end (screen); |
| 666 | } |
| 667 | if (amount < 0) |
| 668 | { |
| 669 | update_begin (screen); |
| 670 | set_terminal_window (end); |
| 671 | ins_del_lines (from + amount, amount); |
| 672 | if (!scroll_region_ok) |
| 673 | ins_del_lines (end + amount, -amount); |
| 674 | set_terminal_window (0); |
| 675 | |
| 676 | rotate_vector (current_screen->glyphs + from + amount, |
| 677 | sizeof (GLYPH *) * (end - from - amount), |
| 678 | amount * sizeof (GLYPH *)); |
| 679 | |
| 680 | safe_bcopy (current_screen->used + from, |
| 681 | current_screen->used + from + amount, |
| 682 | (end - from) * sizeof current_screen->used[0]); |
| 683 | |
| 684 | safe_bcopy (current_screen->highlight + from, |
| 685 | current_screen->highlight + from + amount, |
| 686 | (end - from) * sizeof current_screen->highlight[0]); |
| 687 | |
| 688 | safe_bcopy (current_screen->enable + from, |
| 689 | current_screen->enable + from + amount, |
| 690 | (end - from) * sizeof current_screen->enable[0]); |
| 691 | |
| 692 | /* Mark the lines made empty by scrolling as enabled, empty and |
| 693 | normal video. */ |
| 694 | bzero (current_screen->used + end + amount, |
| 695 | - amount * sizeof current_screen->used[0]); |
| 696 | bzero (current_screen->highlight + end + amount, |
| 697 | - amount * sizeof current_screen->highlight[0]); |
| 698 | for (i = end + amount; i < end; i++) |
| 699 | { |
| 700 | current_screen->glyphs[i][0] = '\0'; |
| 701 | current_screen->enable[i] = 1; |
| 702 | } |
| 703 | |
| 704 | safe_bcopy (current_screen->bufp + from, |
| 705 | current_screen->bufp + from + amount, |
| 706 | (end - from) * sizeof current_screen->bufp[0]); |
| 707 | |
| 708 | #ifdef HAVE_X_WINDOWS |
| 709 | if (SCREEN_IS_X (screen)) |
| 710 | { |
| 711 | safe_bcopy (current_screen->nruns + from, |
| 712 | current_screen->nruns + from + amount, |
| 713 | (end - from) * sizeof current_screen->nruns[0]); |
| 714 | |
| 715 | safe_bcopy (current_screen->face_list + from, |
| 716 | current_screen->face_list + from + amount, |
| 717 | (end - from) * sizeof current_screen->face_list[0]); |
| 718 | |
| 719 | safe_bcopy (current_screen->top_left_x + from, |
| 720 | current_screen->top_left_x + from + amount, |
| 721 | (end - from) * sizeof current_screen->top_left_x[0]); |
| 722 | |
| 723 | safe_bcopy (current_screen->top_left_y + from, |
| 724 | current_screen->top_left_y + from + amount, |
| 725 | (end - from) * sizeof current_screen->top_left_y[0]); |
| 726 | |
| 727 | safe_bcopy (current_screen->pix_width + from, |
| 728 | current_screen->pix_width + from + amount, |
| 729 | (end - from) * sizeof current_screen->pix_width[0]); |
| 730 | |
| 731 | safe_bcopy (current_screen->pix_height + from, |
| 732 | current_screen->pix_height + from + amount, |
| 733 | (end - from) * sizeof current_screen->pix_height[0]); |
| 734 | } |
| 735 | #endif /* HAVE_X_WINDOWS */ |
| 736 | |
| 737 | update_end (screen); |
| 738 | } |
| 739 | return 1; |
| 740 | } |
| 741 | \f |
| 742 | /* After updating a window W that isn't the full screen wide, |
| 743 | copy all the columns that W does not occupy |
| 744 | into the SCREEN_DESIRED_GLYPHS (screen) from the SCREEN_PHYS_GLYPHS (screen) |
| 745 | so that update_screen will not change those columns. */ |
| 746 | |
| 747 | preserve_other_columns (w) |
| 748 | struct window *w; |
| 749 | { |
| 750 | register int vpos; |
| 751 | register struct screen_glyphs *current_screen, *desired_screen; |
| 752 | register SCREEN_PTR screen = XSCREEN (w->screen); |
| 753 | int start = XFASTINT (w->left); |
| 754 | int end = XFASTINT (w->left) + XFASTINT (w->width); |
| 755 | int bot = XFASTINT (w->top) + XFASTINT (w->height); |
| 756 | |
| 757 | current_screen = SCREEN_CURRENT_GLYPHS (screen); |
| 758 | desired_screen = SCREEN_DESIRED_GLYPHS (screen); |
| 759 | |
| 760 | for (vpos = XFASTINT (w->top); vpos < bot; vpos++) |
| 761 | { |
| 762 | if (current_screen->enable[vpos] && desired_screen->enable[vpos]) |
| 763 | { |
| 764 | if (start > 0) |
| 765 | { |
| 766 | int len; |
| 767 | |
| 768 | bcopy (current_screen->glyphs[vpos], |
| 769 | desired_screen->glyphs[vpos], start); |
| 770 | len = min (start, current_screen->used[vpos]); |
| 771 | if (desired_screen->used[vpos] < len) |
| 772 | desired_screen->used[vpos] = len; |
| 773 | } |
| 774 | if (current_screen->used[vpos] > end |
| 775 | && desired_screen->used[vpos] < current_screen->used[vpos]) |
| 776 | { |
| 777 | while (desired_screen->used[vpos] < end) |
| 778 | desired_screen->glyphs[vpos][desired_screen->used[vpos]++] |
| 779 | = SPACEGLYPH; |
| 780 | bcopy (current_screen->glyphs[vpos] + end, |
| 781 | desired_screen->glyphs[vpos] + end, |
| 782 | current_screen->used[vpos] - end); |
| 783 | desired_screen->used[vpos] = current_screen->used[vpos]; |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | } |
| 788 | \f |
| 789 | #if 0 |
| 790 | |
| 791 | /* If window w does not need to be updated and isn't the full screen wide, |
| 792 | copy all the columns that w does occupy |
| 793 | into the SCREEN_DESIRED_LINES (screen) from the SCREEN_PHYS_LINES (screen) |
| 794 | so that update_screen will not change those columns. |
| 795 | |
| 796 | Have not been able to figure out how to use this correctly. */ |
| 797 | |
| 798 | preserve_my_columns (w) |
| 799 | struct window *w; |
| 800 | { |
| 801 | register int vpos, fin; |
| 802 | register struct screen_glyphs *l1, *l2; |
| 803 | register SCREEN_PTR screen = XSCREEN (w->screen); |
| 804 | int start = XFASTINT (w->left); |
| 805 | int end = XFASTINT (w->left) + XFASTINT (w->width); |
| 806 | int bot = XFASTINT (w->top) + XFASTINT (w->height); |
| 807 | |
| 808 | for (vpos = XFASTINT (w->top); vpos < bot; vpos++) |
| 809 | { |
| 810 | if ((l1 = SCREEN_DESIRED_GLYPHS (screen)->glyphs[vpos + 1]) |
| 811 | && (l2 = SCREEN_PHYS_GLYPHS (screen)->glyphs[vpos + 1])) |
| 812 | { |
| 813 | if (l2->length > start && l1->length < l2->length) |
| 814 | { |
| 815 | fin = l2->length; |
| 816 | if (fin > end) fin = end; |
| 817 | while (l1->length < start) |
| 818 | l1->body[l1->length++] = ' '; |
| 819 | bcopy (l2->body + start, l1->body + start, fin - start); |
| 820 | l1->length = fin; |
| 821 | } |
| 822 | } |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | #endif |
| 827 | \f |
| 828 | /* On discovering that the redisplay for a window was no good, |
| 829 | cancel the columns of that window, so that when the window is |
| 830 | displayed over again get_display_line will not complain. */ |
| 831 | |
| 832 | cancel_my_columns (w) |
| 833 | struct window *w; |
| 834 | { |
| 835 | register int vpos; |
| 836 | register SCREEN_PTR screen = XSCREEN (w->screen); |
| 837 | register struct screen_glyphs *desired_glyphs = screen->desired_glyphs; |
| 838 | register int start = XFASTINT (w->left); |
| 839 | register int bot = XFASTINT (w->top) + XFASTINT (w->height); |
| 840 | |
| 841 | for (vpos = XFASTINT (w->top); vpos < bot; vpos++) |
| 842 | if (desired_glyphs->enable[vpos] |
| 843 | && desired_glyphs->used[vpos] >= start) |
| 844 | desired_glyphs->used[vpos] = start; |
| 845 | } |
| 846 | \f |
| 847 | /* These functions try to perform directly and immediately on the screen |
| 848 | the necessary output for one change in the buffer. |
| 849 | They may return 0 meaning nothing was done if anything is difficult, |
| 850 | or 1 meaning the output was performed properly. |
| 851 | They assume that the screen was up to date before the buffer |
| 852 | change being displayed. THey make various other assumptions too; |
| 853 | see command_loop_1 where these are called. */ |
| 854 | |
| 855 | int |
| 856 | direct_output_for_insert (g) |
| 857 | int g; |
| 858 | { |
| 859 | register SCREEN_PTR screen = selected_screen; |
| 860 | register struct screen_glyphs *current_screen |
| 861 | = SCREEN_CURRENT_GLYPHS (screen); |
| 862 | |
| 863 | #ifndef COMPILER_REGISTER_BUG |
| 864 | register |
| 865 | #endif /* COMPILER_REGISTER_BUG */ |
| 866 | struct window *w = XWINDOW (selected_window); |
| 867 | #ifndef COMPILER_REGISTER_BUG |
| 868 | register |
| 869 | #endif /* COMPILER_REGISTER_BUG */ |
| 870 | int hpos = SCREEN_CURSOR_X (screen); |
| 871 | #ifndef COMPILER_REGISTER_BUG |
| 872 | register |
| 873 | #endif /* COMPILER_REGISTER_BUG */ |
| 874 | int vpos = SCREEN_CURSOR_Y (screen); |
| 875 | |
| 876 | /* Give up if about to continue line */ |
| 877 | if (hpos - XFASTINT (w->left) + 1 + 1 >= XFASTINT (w->width) |
| 878 | |
| 879 | /* Avoid losing if cursor is in invisible text off left margin */ |
| 880 | || (XINT (w->hscroll) && hpos == XFASTINT (w->left)) |
| 881 | |
| 882 | /* Give up if cursor outside window (in minibuf, probably) */ |
| 883 | || SCREEN_CURSOR_Y (screen) < XFASTINT (w->top) |
| 884 | || SCREEN_CURSOR_Y (screen) >= XFASTINT (w->top) + XFASTINT (w->height) |
| 885 | |
| 886 | /* Give up if cursor not really at SCREEN_CURSOR_X, SCREEN_CURSOR_Y */ |
| 887 | || !display_completed |
| 888 | |
| 889 | /* Give up if buffer appears in two places. */ |
| 890 | || buffer_shared > 1 |
| 891 | |
| 892 | /* Give up if w is minibuffer and a message is being displayed there */ |
| 893 | || (MINI_WINDOW_P (w) && echo_area_glyphs)) |
| 894 | return 0; |
| 895 | |
| 896 | current_screen->glyphs[vpos][hpos] = g; |
| 897 | unchanged_modified = MODIFF; |
| 898 | beg_unchanged = GPT - BEG; |
| 899 | XFASTINT (w->last_point) = point; |
| 900 | XFASTINT (w->last_point_x) = hpos; |
| 901 | XFASTINT (w->last_modified) = MODIFF; |
| 902 | |
| 903 | reassert_line_highlight (0, vpos); |
| 904 | write_glyphs (¤t_screen->glyphs[vpos][hpos], 1); |
| 905 | fflush (stdout); |
| 906 | ++SCREEN_CURSOR_X (screen); |
| 907 | if (hpos == current_screen->used[vpos]) |
| 908 | { |
| 909 | current_screen->used[vpos] = hpos + 1; |
| 910 | current_screen->glyphs[vpos][hpos + 1] = 0; |
| 911 | } |
| 912 | |
| 913 | return 1; |
| 914 | } |
| 915 | |
| 916 | int |
| 917 | direct_output_forward_char (n) |
| 918 | int n; |
| 919 | { |
| 920 | register SCREEN_PTR screen = selected_screen; |
| 921 | register struct window *w = XWINDOW (selected_window); |
| 922 | |
| 923 | /* Avoid losing if cursor is in invisible text off left margin |
| 924 | or about to go off either side of window. */ |
| 925 | if ((SCREEN_CURSOR_X (screen) == XFASTINT (w->left) |
| 926 | && (XINT (w->hscroll) || n < 0)) |
| 927 | || (n > 0 |
| 928 | && (SCREEN_CURSOR_X (screen) + 1 |
| 929 | >= (XFASTINT (w->left) + XFASTINT (w->width) |
| 930 | - (XFASTINT (w->width) < SCREEN_WIDTH (screen)) |
| 931 | - 1)))) |
| 932 | return 0; |
| 933 | |
| 934 | SCREEN_CURSOR_X (screen) += n; |
| 935 | XFASTINT (w->last_point_x) = SCREEN_CURSOR_X (screen); |
| 936 | XFASTINT (w->last_point) = point; |
| 937 | cursor_to (SCREEN_CURSOR_Y (screen), SCREEN_CURSOR_X (screen)); |
| 938 | fflush (stdout); |
| 939 | return 1; |
| 940 | } |
| 941 | \f |
| 942 | static void update_line (); |
| 943 | |
| 944 | /* Update screen S based on the data in SCREEN_DESIRED_GLYPHS. |
| 945 | Value is nonzero if redisplay stopped due to pending input. |
| 946 | FORCE nonzero means do not stop for pending input. */ |
| 947 | |
| 948 | int |
| 949 | update_screen (s, force, inhibit_hairy_id) |
| 950 | SCREEN_PTR s; |
| 951 | int force; |
| 952 | int inhibit_hairy_id; |
| 953 | { |
| 954 | register struct screen_glyphs *current_screen = SCREEN_CURRENT_GLYPHS (s); |
| 955 | register struct screen_glyphs *desired_screen = SCREEN_DESIRED_GLYPHS (s); |
| 956 | register int i; |
| 957 | int pause; |
| 958 | int preempt_count = baud_rate / 2400 + 1; |
| 959 | extern input_pending; |
| 960 | #ifdef HAVE_X_WINDOWS |
| 961 | register int downto, leftmost; |
| 962 | #endif |
| 963 | |
| 964 | if (SCREEN_HEIGHT (s) == 0) abort (); /* Some bug zeros some core */ |
| 965 | |
| 966 | detect_input_pending (); |
| 967 | if (input_pending && !force) |
| 968 | { |
| 969 | pause = 1; |
| 970 | goto do_pause; |
| 971 | } |
| 972 | |
| 973 | update_begin (s); |
| 974 | |
| 975 | if (!line_ins_del_ok) |
| 976 | inhibit_hairy_id = 1; |
| 977 | |
| 978 | /* See if any of the desired lines are enabled; don't compute for |
| 979 | i/d line if just want cursor motion. */ |
| 980 | for (i = 0; i < SCREEN_HEIGHT (s); i++) |
| 981 | if (desired_screen->enable[i]) |
| 982 | break; |
| 983 | |
| 984 | /* Try doing i/d line, if not yet inhibited. */ |
| 985 | if (!inhibit_hairy_id && i < SCREEN_HEIGHT (s)) |
| 986 | force |= scrolling (s); |
| 987 | |
| 988 | /* Update the individual lines as needed. Do bottom line first. */ |
| 989 | |
| 990 | if (desired_screen->enable[SCREEN_HEIGHT (s) - 1]) |
| 991 | update_line (s, SCREEN_HEIGHT (s) - 1); |
| 992 | |
| 993 | #ifdef HAVE_X_WINDOWS |
| 994 | if (SCREEN_IS_X (s)) |
| 995 | { |
| 996 | leftmost = downto = s->display.x->internal_border_width; |
| 997 | if (desired_screen->enable[0]) |
| 998 | { |
| 999 | current_screen->top_left_x[SCREEN_HEIGHT (s) - 1] = leftmost; |
| 1000 | current_screen->top_left_y[SCREEN_HEIGHT (s) - 1] |
| 1001 | = PIXEL_HEIGHT (s) - s->display.x->internal_border_width |
| 1002 | - LINE_HEIGHT(s, SCREEN_HEIGHT (s) - 1); |
| 1003 | current_screen->top_left_x[0] = leftmost; |
| 1004 | current_screen->top_left_y[0] = downto; |
| 1005 | } |
| 1006 | } |
| 1007 | #endif /* HAVE_X_WINDOWS */ |
| 1008 | |
| 1009 | /* Now update the rest of the lines. */ |
| 1010 | for (i = 0; i < SCREEN_HEIGHT (s) - 1 && (force || !input_pending); i++) |
| 1011 | { |
| 1012 | if (desired_screen->enable[i]) |
| 1013 | { |
| 1014 | if (SCREEN_IS_TERMCAP (s)) |
| 1015 | { |
| 1016 | /* Flush out every so many lines. |
| 1017 | Also flush out if likely to have more than 1k buffered |
| 1018 | otherwise. I'm told that some telnet connections get |
| 1019 | really screwed by more than 1k output at once. */ |
| 1020 | int outq = PENDING_OUTPUT_COUNT (stdout); |
| 1021 | if (outq > 900 |
| 1022 | || (outq > 20 && ((i - 1) % preempt_count == 0))) |
| 1023 | { |
| 1024 | fflush (stdout); |
| 1025 | if (preempt_count == 1) |
| 1026 | { |
| 1027 | #ifdef EMACS_OUTQSIZE |
| 1028 | if (EMACS_OUTQSIZE (0, &outq) < 0) |
| 1029 | /* Probably not a tty. Ignore the error and reset |
| 1030 | * the outq count. */ |
| 1031 | outq = PENDING_OUTPUT_COUNT (stdout); |
| 1032 | #endif |
| 1033 | outq *= 10; |
| 1034 | sleep (outq / baud_rate); |
| 1035 | } |
| 1036 | } |
| 1037 | if ((i - 1) % preempt_count == 0) |
| 1038 | detect_input_pending (); |
| 1039 | } |
| 1040 | |
| 1041 | update_line (s, i); |
| 1042 | #ifdef HAVE_X_WINDOWS |
| 1043 | if (SCREEN_IS_X (s)) |
| 1044 | { |
| 1045 | current_screen->top_left_y[i] = downto; |
| 1046 | current_screen->top_left_x[i] = leftmost; |
| 1047 | } |
| 1048 | #endif /* HAVE_X_WINDOWS */ |
| 1049 | } |
| 1050 | |
| 1051 | if (SCREEN_IS_X (s)) |
| 1052 | downto += LINE_HEIGHT(s, i); |
| 1053 | } |
| 1054 | pause = (i < SCREEN_HEIGHT (s) - 1) ? i : 0; |
| 1055 | |
| 1056 | /* Now just clean up termcap drivers and set cursor, etc. */ |
| 1057 | if (!pause) |
| 1058 | { |
| 1059 | |
| 1060 | if (s == selected_screen && cursor_in_echo_area < 0) |
| 1061 | cursor_to (SCREEN_HEIGHT (s) - 1, 0); |
| 1062 | else if (s == selected_screen && cursor_in_echo_area |
| 1063 | && !desired_screen->used[SCREEN_HEIGHT (s) - 1]) |
| 1064 | cursor_to (SCREEN_HEIGHT (s), 0); |
| 1065 | else if (cursor_in_echo_area) |
| 1066 | cursor_to (SCREEN_HEIGHT (s) - 1, |
| 1067 | min (SCREEN_WIDTH (s) - 1, |
| 1068 | desired_screen->used[SCREEN_HEIGHT (s) - 1])); |
| 1069 | else |
| 1070 | cursor_to (SCREEN_CURSOR_Y (s), max (min (SCREEN_CURSOR_X (s), |
| 1071 | SCREEN_WIDTH (s) - 1), 0)); |
| 1072 | } |
| 1073 | |
| 1074 | update_end (s); |
| 1075 | |
| 1076 | if (termscript) |
| 1077 | fflush (termscript); |
| 1078 | fflush (stdout); |
| 1079 | |
| 1080 | /* Here if output is preempted because input is detected. */ |
| 1081 | do_pause: |
| 1082 | |
| 1083 | if (SCREEN_HEIGHT (s) == 0) abort (); /* Some bug zeros some core */ |
| 1084 | display_completed = !pause; |
| 1085 | |
| 1086 | bzero (desired_screen->enable, SCREEN_HEIGHT (s)); |
| 1087 | return pause; |
| 1088 | } |
| 1089 | |
| 1090 | /* Called when about to quit, to check for doing so |
| 1091 | at an improper time. */ |
| 1092 | |
| 1093 | void |
| 1094 | quit_error_check () |
| 1095 | { |
| 1096 | if (SCREEN_DESIRED_GLYPHS (selected_screen) == 0) |
| 1097 | return; |
| 1098 | if (SCREEN_DESIRED_GLYPHS (selected_screen)->enable[0]) |
| 1099 | abort (); |
| 1100 | if (SCREEN_DESIRED_GLYPHS (selected_screen)->enable[SCREEN_HEIGHT (selected_screen) - 1]) |
| 1101 | abort (); |
| 1102 | } |
| 1103 | \f |
| 1104 | /* Decide what insert/delete line to do, and do it */ |
| 1105 | |
| 1106 | extern void scrolling_1 (); |
| 1107 | |
| 1108 | scrolling (screen) |
| 1109 | SCREEN_PTR screen; |
| 1110 | { |
| 1111 | int unchanged_at_top, unchanged_at_bottom; |
| 1112 | int window_size; |
| 1113 | int changed_lines; |
| 1114 | int *old_hash = (int *) alloca (SCREEN_HEIGHT (screen) * sizeof (int)); |
| 1115 | int *new_hash = (int *) alloca (SCREEN_HEIGHT (screen) * sizeof (int)); |
| 1116 | int *draw_cost = (int *) alloca (SCREEN_HEIGHT (screen) * sizeof (int)); |
| 1117 | register int i; |
| 1118 | int free_at_end_vpos = SCREEN_HEIGHT (screen); |
| 1119 | register struct screen_glyphs *current_screen = SCREEN_CURRENT_GLYPHS (screen); |
| 1120 | register struct screen_glyphs *desired_screen = SCREEN_DESIRED_GLYPHS (screen); |
| 1121 | |
| 1122 | /* Compute hash codes of all the lines. |
| 1123 | Also calculate number of changed lines, |
| 1124 | number of unchanged lines at the beginning, |
| 1125 | and number of unchanged lines at the end. */ |
| 1126 | |
| 1127 | changed_lines = 0; |
| 1128 | unchanged_at_top = 0; |
| 1129 | unchanged_at_bottom = SCREEN_HEIGHT (screen); |
| 1130 | for (i = 0; i < SCREEN_HEIGHT (screen); i++) |
| 1131 | { |
| 1132 | /* Give up on this scrolling if some old lines are not enabled. */ |
| 1133 | if (!current_screen->enable[i]) |
| 1134 | return 0; |
| 1135 | old_hash[i] = line_hash_code (current_screen, i); |
| 1136 | if (! desired_screen->enable[i]) |
| 1137 | new_hash[i] = old_hash[i]; |
| 1138 | else |
| 1139 | new_hash[i] = line_hash_code (desired_screen, i); |
| 1140 | |
| 1141 | if (old_hash[i] != new_hash[i]) |
| 1142 | { |
| 1143 | changed_lines++; |
| 1144 | unchanged_at_bottom = SCREEN_HEIGHT (screen) - i - 1; |
| 1145 | } |
| 1146 | else if (i == unchanged_at_top) |
| 1147 | unchanged_at_top++; |
| 1148 | draw_cost[i] = line_draw_cost (desired_screen, i); |
| 1149 | } |
| 1150 | |
| 1151 | /* If changed lines are few, don't allow preemption, don't scroll. */ |
| 1152 | if (changed_lines < baud_rate / 2400 |
| 1153 | || unchanged_at_bottom == SCREEN_HEIGHT (screen)) |
| 1154 | return 1; |
| 1155 | |
| 1156 | window_size = (SCREEN_HEIGHT (screen) - unchanged_at_top |
| 1157 | - unchanged_at_bottom); |
| 1158 | |
| 1159 | if (scroll_region_ok) |
| 1160 | free_at_end_vpos -= unchanged_at_bottom; |
| 1161 | else if (memory_below_screen) |
| 1162 | free_at_end_vpos = -1; |
| 1163 | |
| 1164 | /* If large window, fast terminal and few lines in common between |
| 1165 | current screen and desired screen, don't bother with i/d calc. */ |
| 1166 | if (window_size >= 18 && baud_rate > 2400 |
| 1167 | && (window_size >= |
| 1168 | 10 * scrolling_max_lines_saved (unchanged_at_top, |
| 1169 | SCREEN_HEIGHT (screen) - unchanged_at_bottom, |
| 1170 | old_hash, new_hash, draw_cost))) |
| 1171 | return 0; |
| 1172 | |
| 1173 | scrolling_1 (screen, window_size, unchanged_at_top, unchanged_at_bottom, |
| 1174 | draw_cost + unchanged_at_top - 1, |
| 1175 | old_hash + unchanged_at_top - 1, |
| 1176 | new_hash + unchanged_at_top - 1, |
| 1177 | free_at_end_vpos - unchanged_at_top); |
| 1178 | |
| 1179 | return 0; |
| 1180 | } |
| 1181 | \f |
| 1182 | /* Return the offset in its buffer of the character at location col, line |
| 1183 | in the given window. */ |
| 1184 | int |
| 1185 | buffer_posn_from_coords (window, col, line) |
| 1186 | struct window *window; |
| 1187 | int col, line; |
| 1188 | { |
| 1189 | int window_left = XFASTINT (window->left); |
| 1190 | |
| 1191 | /* The actual width of the window is window->width less one for the |
| 1192 | DISP_CONTINUE_GLYPH, and less one if it's not the rightmost |
| 1193 | window. */ |
| 1194 | int window_width = (XFASTINT (window->width) - 1 |
| 1195 | - (XFASTINT (window->width) + window_left |
| 1196 | != SCREEN_WIDTH (XSCREEN (window->screen)))); |
| 1197 | |
| 1198 | int startp = marker_position (window->start); |
| 1199 | |
| 1200 | /* Since compute_motion will only operate on the current buffer, |
| 1201 | we need to save the old one and restore it when we're done. */ |
| 1202 | struct buffer *old_current_buffer = current_buffer; |
| 1203 | struct position *posn; |
| 1204 | |
| 1205 | current_buffer = XBUFFER (window->buffer); |
| 1206 | |
| 1207 | /* It would be nice if we could use SCREEN_CURRENT_GLYPHS (XSCREEN |
| 1208 | (window->screen))->bufp to avoid scanning from the very top of |
| 1209 | the window, but it isn't maintained correctly, and I'm not even |
| 1210 | sure I will keep it. */ |
| 1211 | posn = compute_motion (startp, 0, |
| 1212 | (window == XWINDOW (minibuf_window) && startp == 1 |
| 1213 | ? minibuf_prompt_width : 0), |
| 1214 | ZV, line, col - window_left, |
| 1215 | window_width, XINT (window->hscroll), 0); |
| 1216 | |
| 1217 | current_buffer = old_current_buffer; |
| 1218 | |
| 1219 | /* compute_motion considers screen points past the end of a line |
| 1220 | to be *after* the newline, i.e. at the start of the next line. |
| 1221 | This is reasonable, but not really what we want. So if the |
| 1222 | result is on a line below LINE, back it up one character. */ |
| 1223 | if (posn->vpos > line) |
| 1224 | return posn->bufpos - 1; |
| 1225 | else |
| 1226 | return posn->bufpos; |
| 1227 | } |
| 1228 | \f |
| 1229 | static int |
| 1230 | count_blanks (r) |
| 1231 | register GLYPH *r; |
| 1232 | { |
| 1233 | register GLYPH *p = r; |
| 1234 | while (*r++ == SPACEGLYPH); |
| 1235 | return r - p - 1; |
| 1236 | } |
| 1237 | |
| 1238 | static int |
| 1239 | count_match (str1, str2) |
| 1240 | GLYPH *str1, *str2; |
| 1241 | { |
| 1242 | register GLYPH *p1 = str1; |
| 1243 | register GLYPH *p2 = str2; |
| 1244 | while (*p1++ == *p2++); |
| 1245 | return p1 - str1 - 1; |
| 1246 | } |
| 1247 | |
| 1248 | /* Char insertion/deletion cost vector, from term.c */ |
| 1249 | extern int *char_ins_del_vector; |
| 1250 | |
| 1251 | #define char_ins_del_cost(s) (&char_ins_del_vector[SCREEN_HEIGHT((s))]) |
| 1252 | |
| 1253 | static void |
| 1254 | update_line (screen, vpos) |
| 1255 | register SCREEN_PTR screen; |
| 1256 | int vpos; |
| 1257 | { |
| 1258 | register GLYPH *obody, *nbody, *op1, *op2, *np1, *temp; |
| 1259 | int tem; |
| 1260 | int osp, nsp, begmatch, endmatch, olen, nlen; |
| 1261 | int save; |
| 1262 | register struct screen_glyphs *current_screen |
| 1263 | = SCREEN_CURRENT_GLYPHS (screen); |
| 1264 | register struct screen_glyphs *desired_screen |
| 1265 | = SCREEN_DESIRED_GLYPHS (screen); |
| 1266 | |
| 1267 | if (desired_screen->highlight[vpos] |
| 1268 | != (current_screen->enable[vpos] && current_screen->highlight[vpos])) |
| 1269 | { |
| 1270 | change_line_highlight (desired_screen->highlight[vpos], vpos, |
| 1271 | (current_screen->enable[vpos] ? |
| 1272 | current_screen->used[vpos] : 0)); |
| 1273 | current_screen->enable[vpos] = 0; |
| 1274 | } |
| 1275 | else |
| 1276 | reassert_line_highlight (desired_screen->highlight[vpos], vpos); |
| 1277 | |
| 1278 | if (! current_screen->enable[vpos]) |
| 1279 | { |
| 1280 | olen = 0; |
| 1281 | } |
| 1282 | else |
| 1283 | { |
| 1284 | obody = current_screen->glyphs[vpos]; |
| 1285 | olen = current_screen->used[vpos]; |
| 1286 | if (! current_screen->highlight[vpos]) |
| 1287 | { |
| 1288 | if (!must_write_spaces) |
| 1289 | while (obody[olen - 1] == SPACEGLYPH && olen > 0) |
| 1290 | olen--; |
| 1291 | } |
| 1292 | else |
| 1293 | { |
| 1294 | /* For an inverse-video line, remember we gave it |
| 1295 | spaces all the way to the screen edge |
| 1296 | so that the reverse video extends all the way across. */ |
| 1297 | |
| 1298 | while (olen < SCREEN_WIDTH (screen) - 1) |
| 1299 | obody[olen++] = SPACEGLYPH; |
| 1300 | } |
| 1301 | } |
| 1302 | |
| 1303 | /* One way or another, this will enable the line being updated. */ |
| 1304 | current_screen->enable[vpos] = 1; |
| 1305 | current_screen->used[vpos] = desired_screen->used[vpos]; |
| 1306 | current_screen->highlight[vpos] = desired_screen->highlight[vpos]; |
| 1307 | current_screen->bufp[vpos] = desired_screen->bufp[vpos]; |
| 1308 | |
| 1309 | #ifdef HAVE_X_WINDOWS |
| 1310 | if (SCREEN_IS_X (screen)) |
| 1311 | { |
| 1312 | current_screen->pix_width[vpos] |
| 1313 | = current_screen->used[vpos] |
| 1314 | * FONT_WIDTH (screen->display.x->font); |
| 1315 | current_screen->pix_height[vpos] |
| 1316 | = FONT_HEIGHT (screen->display.x->font); |
| 1317 | } |
| 1318 | #endif /* HAVE_X_WINDOWS */ |
| 1319 | |
| 1320 | if (!desired_screen->enable[vpos]) |
| 1321 | { |
| 1322 | nlen = 0; |
| 1323 | goto just_erase; |
| 1324 | } |
| 1325 | |
| 1326 | nbody = desired_screen->glyphs[vpos]; |
| 1327 | nlen = desired_screen->used[vpos]; |
| 1328 | |
| 1329 | /* Pretend trailing spaces are not there at all, |
| 1330 | unless for one reason or another we must write all spaces. */ |
| 1331 | if (! desired_screen->highlight[vpos]) |
| 1332 | { |
| 1333 | if (!must_write_spaces) |
| 1334 | /* We know that the previous character byte contains 0. */ |
| 1335 | while (nbody[nlen - 1] == SPACEGLYPH) |
| 1336 | nlen--; |
| 1337 | } |
| 1338 | else |
| 1339 | { |
| 1340 | /* For an inverse-video line, give it extra trailing spaces |
| 1341 | all the way to the screen edge |
| 1342 | so that the reverse video extends all the way across. */ |
| 1343 | |
| 1344 | while (nlen < SCREEN_WIDTH (screen) - 1) |
| 1345 | nbody[nlen++] = SPACEGLYPH; |
| 1346 | } |
| 1347 | |
| 1348 | /* If there's no i/d char, quickly do the best we can without it. */ |
| 1349 | if (!char_ins_del_ok) |
| 1350 | { |
| 1351 | int i,j; |
| 1352 | |
| 1353 | for (i = 0; i < nlen; i++) |
| 1354 | { |
| 1355 | if (i >= olen || nbody[i] != obody[i]) /* A non-matching char. */ |
| 1356 | { |
| 1357 | cursor_to (vpos, i); |
| 1358 | for (j = 1; (i + j < nlen && |
| 1359 | (i + j >= olen || nbody[i+j] != obody[i+j])); |
| 1360 | j++); |
| 1361 | |
| 1362 | /* Output this run of non-matching chars. */ |
| 1363 | write_glyphs (nbody + i, j); |
| 1364 | i += j - 1; |
| 1365 | |
| 1366 | /* Now find the next non-match. */ |
| 1367 | } |
| 1368 | } |
| 1369 | |
| 1370 | /* Clear the rest of the line, or the non-clear part of it. */ |
| 1371 | if (olen > nlen) |
| 1372 | { |
| 1373 | cursor_to (vpos, nlen); |
| 1374 | clear_end_of_line (olen); |
| 1375 | } |
| 1376 | |
| 1377 | /* Exchange contents between current_screen and new_screen. */ |
| 1378 | temp = desired_screen->glyphs[vpos]; |
| 1379 | desired_screen->glyphs[vpos] = current_screen->glyphs[vpos]; |
| 1380 | current_screen->glyphs[vpos] = temp; |
| 1381 | |
| 1382 | return; |
| 1383 | } |
| 1384 | |
| 1385 | if (!olen) |
| 1386 | { |
| 1387 | nsp = (must_write_spaces || desired_screen->highlight[vpos]) |
| 1388 | ? 0 : count_blanks (nbody); |
| 1389 | if (nlen > nsp) |
| 1390 | { |
| 1391 | cursor_to (vpos, nsp); |
| 1392 | write_glyphs (nbody + nsp, nlen - nsp); |
| 1393 | } |
| 1394 | |
| 1395 | /* Exchange contents between current_screen and new_screen. */ |
| 1396 | temp = desired_screen->glyphs[vpos]; |
| 1397 | desired_screen->glyphs[vpos] = current_screen->glyphs[vpos]; |
| 1398 | current_screen->glyphs[vpos] = temp; |
| 1399 | |
| 1400 | return; |
| 1401 | } |
| 1402 | |
| 1403 | obody[olen] = 1; |
| 1404 | save = nbody[nlen]; |
| 1405 | nbody[nlen] = 0; |
| 1406 | |
| 1407 | /* Compute number of leading blanks in old and new contents. */ |
| 1408 | osp = count_blanks (obody); |
| 1409 | if (!desired_screen->highlight[vpos]) |
| 1410 | nsp = count_blanks (nbody); |
| 1411 | else |
| 1412 | nsp = 0; |
| 1413 | |
| 1414 | /* Compute number of matching chars starting with first nonblank. */ |
| 1415 | begmatch = count_match (obody + osp, nbody + nsp); |
| 1416 | |
| 1417 | /* Spaces in new match implicit space past the end of old. */ |
| 1418 | /* A bug causing this to be a no-op was fixed in 18.29. */ |
| 1419 | if (!must_write_spaces && osp + begmatch == olen) |
| 1420 | { |
| 1421 | np1 = nbody + nsp; |
| 1422 | while (np1[begmatch] == SPACEGLYPH) |
| 1423 | begmatch++; |
| 1424 | } |
| 1425 | |
| 1426 | /* Avoid doing insert/delete char |
| 1427 | just cause number of leading spaces differs |
| 1428 | when the following text does not match. */ |
| 1429 | if (begmatch == 0 && osp != nsp) |
| 1430 | osp = nsp = min (osp, nsp); |
| 1431 | |
| 1432 | /* Find matching characters at end of line */ |
| 1433 | op1 = obody + olen; |
| 1434 | np1 = nbody + nlen; |
| 1435 | op2 = op1 + begmatch - min (olen - osp, nlen - nsp); |
| 1436 | while (op1 > op2 && op1[-1] == np1[-1]) |
| 1437 | { |
| 1438 | op1--; |
| 1439 | np1--; |
| 1440 | } |
| 1441 | endmatch = obody + olen - op1; |
| 1442 | |
| 1443 | /* Put correct value back in nbody[nlen]. |
| 1444 | This is important because direct_output_for_insert |
| 1445 | can write into the line at a later point. |
| 1446 | If this screws up the zero at the end of the line, re-establish it. */ |
| 1447 | nbody[nlen] = save; |
| 1448 | obody[olen] = 0; |
| 1449 | |
| 1450 | /* tem gets the distance to insert or delete. |
| 1451 | endmatch is how many characters we save by doing so. |
| 1452 | Is it worth it? */ |
| 1453 | |
| 1454 | tem = (nlen - nsp) - (olen - osp); |
| 1455 | if (endmatch && tem |
| 1456 | && (!char_ins_del_ok || endmatch <= char_ins_del_cost (screen)[tem])) |
| 1457 | endmatch = 0; |
| 1458 | |
| 1459 | /* nsp - osp is the distance to insert or delete. |
| 1460 | If that is nonzero, begmatch is known to be nonzero also. |
| 1461 | begmatch + endmatch is how much we save by doing the ins/del. |
| 1462 | Is it worth it? */ |
| 1463 | |
| 1464 | if (nsp != osp |
| 1465 | && (!char_ins_del_ok |
| 1466 | || begmatch + endmatch <= char_ins_del_cost (screen)[nsp - osp])) |
| 1467 | { |
| 1468 | begmatch = 0; |
| 1469 | endmatch = 0; |
| 1470 | osp = nsp = min (osp, nsp); |
| 1471 | } |
| 1472 | |
| 1473 | /* Now go through the line, inserting, writing and |
| 1474 | deleting as appropriate. */ |
| 1475 | |
| 1476 | if (osp > nsp) |
| 1477 | { |
| 1478 | cursor_to (vpos, nsp); |
| 1479 | delete_glyphs (osp - nsp); |
| 1480 | } |
| 1481 | else if (nsp > osp) |
| 1482 | { |
| 1483 | /* If going to delete chars later in line |
| 1484 | and insert earlier in the line, |
| 1485 | must delete first to avoid losing data in the insert */ |
| 1486 | if (endmatch && nlen < olen + nsp - osp) |
| 1487 | { |
| 1488 | cursor_to (vpos, nlen - endmatch + osp - nsp); |
| 1489 | delete_glyphs (olen + nsp - osp - nlen); |
| 1490 | olen = nlen - (nsp - osp); |
| 1491 | } |
| 1492 | cursor_to (vpos, osp); |
| 1493 | insert_glyphs ((char *)0, nsp - osp); |
| 1494 | } |
| 1495 | olen += nsp - osp; |
| 1496 | |
| 1497 | tem = nsp + begmatch + endmatch; |
| 1498 | if (nlen != tem || olen != tem) |
| 1499 | { |
| 1500 | cursor_to (vpos, nsp + begmatch); |
| 1501 | if (!endmatch || nlen == olen) |
| 1502 | { |
| 1503 | /* If new text being written reaches right margin, |
| 1504 | there is no need to do clear-to-eol at the end. |
| 1505 | (and it would not be safe, since cursor is not |
| 1506 | going to be "at the margin" after the text is done) */ |
| 1507 | if (nlen == SCREEN_WIDTH (screen)) |
| 1508 | olen = 0; |
| 1509 | write_glyphs (nbody + nsp + begmatch, nlen - tem); |
| 1510 | |
| 1511 | #ifdef obsolete |
| 1512 | |
| 1513 | /* the following code loses disastrously if tem == nlen. |
| 1514 | Rather than trying to fix that case, I am trying the simpler |
| 1515 | solution found above. */ |
| 1516 | |
| 1517 | /* If the text reaches to the right margin, |
| 1518 | it will lose one way or another (depending on AutoWrap) |
| 1519 | to clear to end of line after outputting all the text. |
| 1520 | So pause with one character to go and clear the line then. */ |
| 1521 | if (nlen == SCREEN_WIDTH (screen) && fast_clear_end_of_line && olen > nlen) |
| 1522 | { |
| 1523 | /* endmatch must be zero, and tem must equal nsp + begmatch */ |
| 1524 | write_glyphs (nbody + tem, nlen - tem - 1); |
| 1525 | clear_end_of_line (olen); |
| 1526 | olen = 0; /* Don't let it be cleared again later */ |
| 1527 | write_glyphs (nbody + nlen - 1, 1); |
| 1528 | } |
| 1529 | else |
| 1530 | write_glyphs (nbody + nsp + begmatch, nlen - tem); |
| 1531 | #endif /* OBSOLETE */ |
| 1532 | |
| 1533 | } |
| 1534 | else if (nlen > olen) |
| 1535 | { |
| 1536 | write_glyphs (nbody + nsp + begmatch, olen - tem); |
| 1537 | insert_glyphs (nbody + nsp + begmatch + olen - tem, nlen - olen); |
| 1538 | olen = nlen; |
| 1539 | } |
| 1540 | else if (olen > nlen) |
| 1541 | { |
| 1542 | write_glyphs (nbody + nsp + begmatch, nlen - tem); |
| 1543 | delete_glyphs (olen - nlen); |
| 1544 | olen = nlen; |
| 1545 | } |
| 1546 | } |
| 1547 | |
| 1548 | just_erase: |
| 1549 | /* If any unerased characters remain after the new line, erase them. */ |
| 1550 | if (olen > nlen) |
| 1551 | { |
| 1552 | cursor_to (vpos, nlen); |
| 1553 | clear_end_of_line (olen); |
| 1554 | } |
| 1555 | |
| 1556 | /* Exchange contents between current_screen and new_screen. */ |
| 1557 | temp = desired_screen->glyphs[vpos]; |
| 1558 | desired_screen->glyphs[vpos] = current_screen->glyphs[vpos]; |
| 1559 | current_screen->glyphs[vpos] = temp; |
| 1560 | } |
| 1561 | \f |
| 1562 | DEFUN ("open-termscript", Fopen_termscript, Sopen_termscript, |
| 1563 | 1, 1, "FOpen termscript file: ", |
| 1564 | "Start writing all terminal output to FILE as well as the terminal.\n\ |
| 1565 | FILE = nil means just close any termscript file currently open.") |
| 1566 | (file) |
| 1567 | Lisp_Object file; |
| 1568 | { |
| 1569 | if (termscript != 0) fclose (termscript); |
| 1570 | termscript = 0; |
| 1571 | |
| 1572 | if (! NILP (file)) |
| 1573 | { |
| 1574 | file = Fexpand_file_name (file, Qnil); |
| 1575 | termscript = fopen (XSTRING (file)->data, "w"); |
| 1576 | if (termscript == 0) |
| 1577 | report_file_error ("Opening termscript", Fcons (file, Qnil)); |
| 1578 | } |
| 1579 | return Qnil; |
| 1580 | } |
| 1581 | \f |
| 1582 | |
| 1583 | #ifdef SIGWINCH |
| 1584 | SIGTYPE |
| 1585 | window_change_signal () |
| 1586 | { |
| 1587 | int width, height; |
| 1588 | extern int errno; |
| 1589 | int old_errno = errno; |
| 1590 | |
| 1591 | get_screen_size (&width, &height); |
| 1592 | |
| 1593 | /* The screen size change obviously applies to a termcap-controlled |
| 1594 | screen. Find such a screen in the list, and assume it's the only |
| 1595 | one (since the redisplay code always writes to stdout, not a |
| 1596 | FILE * specified in the screen structure). Record the new size, |
| 1597 | but don't reallocate the data structures now. Let that be done |
| 1598 | later outside of the signal handler. */ |
| 1599 | |
| 1600 | { |
| 1601 | Lisp_Object tail; |
| 1602 | |
| 1603 | for (tail = Vscreen_list; CONSP (tail); tail = XCONS (tail)->cdr) |
| 1604 | { |
| 1605 | SCREEN_PTR s = XSCREEN (XCONS (tail)->car); |
| 1606 | |
| 1607 | if (SCREEN_IS_TERMCAP (s)) |
| 1608 | { |
| 1609 | ++in_display; |
| 1610 | change_screen_size (s, height, width, 0); |
| 1611 | --in_display; |
| 1612 | break; |
| 1613 | } |
| 1614 | } |
| 1615 | } |
| 1616 | |
| 1617 | signal (SIGWINCH, window_change_signal); |
| 1618 | errno = old_errno; |
| 1619 | } |
| 1620 | #endif /* SIGWINCH */ |
| 1621 | |
| 1622 | |
| 1623 | /* Do any change in screen size that was requested by a signal. */ |
| 1624 | |
| 1625 | do_pending_window_change () |
| 1626 | { |
| 1627 | /* If window_change_signal should have run before, run it now. */ |
| 1628 | while (delayed_size_change) |
| 1629 | { |
| 1630 | Lisp_Object tail; |
| 1631 | |
| 1632 | delayed_size_change = 0; |
| 1633 | |
| 1634 | for (tail = Vscreen_list; CONSP (tail); tail = XCONS (tail)->cdr) |
| 1635 | { |
| 1636 | SCREEN_PTR s = XSCREEN (XCONS (tail)->car); |
| 1637 | int height = SCREEN_NEW_HEIGHT (s); |
| 1638 | int width = SCREEN_NEW_WIDTH (s); |
| 1639 | |
| 1640 | SCREEN_NEW_HEIGHT (s) = 0; |
| 1641 | SCREEN_NEW_WIDTH (s) = 0; |
| 1642 | |
| 1643 | if (height != 0) |
| 1644 | change_screen_size (s, height, width, 0); |
| 1645 | } |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | |
| 1650 | /* Change the screen height and/or width. Values may be given as zero to |
| 1651 | indicate no change is to take place. */ |
| 1652 | |
| 1653 | change_screen_size (screen, newlength, newwidth, pretend) |
| 1654 | register SCREEN_PTR screen; |
| 1655 | register int newlength, newwidth, pretend; |
| 1656 | { |
| 1657 | /* If we can't deal with the change now, queue it for later. */ |
| 1658 | if (in_display) |
| 1659 | { |
| 1660 | SCREEN_NEW_HEIGHT (screen) = newlength; |
| 1661 | SCREEN_NEW_WIDTH (screen) = newwidth; |
| 1662 | delayed_size_change = 1; |
| 1663 | return; |
| 1664 | } |
| 1665 | |
| 1666 | /* This size-change overrides any pending one for this screen. */ |
| 1667 | SCREEN_NEW_HEIGHT (screen) = 0; |
| 1668 | SCREEN_NEW_WIDTH (screen) = 0; |
| 1669 | |
| 1670 | if ((newlength == 0 || newlength == SCREEN_HEIGHT (screen)) |
| 1671 | && (newwidth == 0 || newwidth == SCREEN_WIDTH (screen))) |
| 1672 | return; |
| 1673 | |
| 1674 | if (newlength && newlength != SCREEN_HEIGHT (screen)) |
| 1675 | { |
| 1676 | if (SCREEN_HAS_MINIBUF (screen) |
| 1677 | && ! SCREEN_MINIBUF_ONLY_P (screen)) |
| 1678 | { |
| 1679 | /* Screen has both root and minibuffer. */ |
| 1680 | set_window_height (SCREEN_ROOT_WINDOW (screen), |
| 1681 | newlength - 1, 0); |
| 1682 | XFASTINT (XWINDOW (SCREEN_MINIBUF_WINDOW (screen))->top) |
| 1683 | = newlength - 1; |
| 1684 | set_window_height (SCREEN_MINIBUF_WINDOW (screen), 1, 0); |
| 1685 | } |
| 1686 | else |
| 1687 | /* Screen has just one top-level window. */ |
| 1688 | set_window_height (SCREEN_ROOT_WINDOW (screen), newlength, 0); |
| 1689 | |
| 1690 | if (SCREEN_IS_TERMCAP (screen) && !pretend) |
| 1691 | ScreenRows = newlength; |
| 1692 | |
| 1693 | #if 0 |
| 1694 | if (screen->output_method == output_termcap) |
| 1695 | { |
| 1696 | screen_height = newlength; |
| 1697 | if (!pretend) |
| 1698 | ScreenRows = newlength; |
| 1699 | } |
| 1700 | #endif |
| 1701 | } |
| 1702 | |
| 1703 | if (newwidth && newwidth != SCREEN_WIDTH (screen)) |
| 1704 | { |
| 1705 | set_window_width (SCREEN_ROOT_WINDOW (screen), newwidth, 0); |
| 1706 | if (SCREEN_HAS_MINIBUF (screen)) |
| 1707 | set_window_width (SCREEN_MINIBUF_WINDOW (screen), newwidth, 0); |
| 1708 | SCREEN_WIDTH (screen) = newwidth; |
| 1709 | |
| 1710 | if (SCREEN_IS_TERMCAP (screen) && !pretend) |
| 1711 | ScreenCols = newwidth; |
| 1712 | #if 0 |
| 1713 | if (screen->output_method == output_termcap) |
| 1714 | { |
| 1715 | screen_width = newwidth; |
| 1716 | if (!pretend) |
| 1717 | ScreenCols = newwidth; |
| 1718 | } |
| 1719 | #endif |
| 1720 | } |
| 1721 | |
| 1722 | if (newlength) |
| 1723 | SCREEN_HEIGHT (screen) = newlength; |
| 1724 | |
| 1725 | remake_screen_glyphs (screen); |
| 1726 | calculate_costs (screen); |
| 1727 | } |
| 1728 | \f |
| 1729 | DEFUN ("send-string-to-terminal", Fsend_string_to_terminal, |
| 1730 | Ssend_string_to_terminal, 1, 1, 0, |
| 1731 | "Send STRING to the terminal without alteration.\n\ |
| 1732 | Control characters in STRING will have terminal-dependent effects.") |
| 1733 | (str) |
| 1734 | Lisp_Object str; |
| 1735 | { |
| 1736 | CHECK_STRING (str, 0); |
| 1737 | fwrite (XSTRING (str)->data, 1, XSTRING (str)->size, stdout); |
| 1738 | fflush (stdout); |
| 1739 | if (termscript) |
| 1740 | { |
| 1741 | fwrite (XSTRING (str)->data, 1, XSTRING (str)->size, termscript); |
| 1742 | fflush (termscript); |
| 1743 | } |
| 1744 | return Qnil; |
| 1745 | } |
| 1746 | |
| 1747 | DEFUN ("ding", Fding, Sding, 0, 1, 0, |
| 1748 | "Beep, or flash the screen.\n\ |
| 1749 | Also, unless an argument is given,\n\ |
| 1750 | terminate any keyboard macro currently executing.") |
| 1751 | (arg) |
| 1752 | Lisp_Object arg; |
| 1753 | { |
| 1754 | if (!NILP (arg)) |
| 1755 | { |
| 1756 | ring_bell (); |
| 1757 | fflush (stdout); |
| 1758 | } |
| 1759 | else |
| 1760 | bitch_at_user (); |
| 1761 | |
| 1762 | return Qnil; |
| 1763 | } |
| 1764 | |
| 1765 | bitch_at_user () |
| 1766 | { |
| 1767 | if (noninteractive) |
| 1768 | putchar (07); |
| 1769 | else if (!INTERACTIVE) /* Stop executing a keyboard macro. */ |
| 1770 | error ("Keyboard macro terminated by a command ringing the bell"); |
| 1771 | else |
| 1772 | ring_bell (); |
| 1773 | fflush (stdout); |
| 1774 | } |
| 1775 | |
| 1776 | DEFUN ("sleep-for", Fsleep_for, Ssleep_for, 1, 2, 0, |
| 1777 | "Pause, without updating display, for ARG seconds.\n\ |
| 1778 | Optional second arg non-nil means ARG is measured in milliseconds.\n\ |
| 1779 | \(Not all operating systems support milliseconds.)") |
| 1780 | (n, millisec) |
| 1781 | Lisp_Object n, millisec; |
| 1782 | { |
| 1783 | #ifndef subprocesses |
| 1784 | EMACS_TIME timeout, end_time; |
| 1785 | #endif /* no subprocesses */ |
| 1786 | int usec = 0; |
| 1787 | int sec; |
| 1788 | |
| 1789 | CHECK_NUMBER (n, 0); |
| 1790 | sec = XINT (n); |
| 1791 | if (sec <= 0) |
| 1792 | return Qnil; |
| 1793 | |
| 1794 | if (!NILP (millisec)) |
| 1795 | { |
| 1796 | #ifndef EMACS_HAS_USECS |
| 1797 | error ("millisecond sit-for not supported on %s", SYSTEM_TYPE); |
| 1798 | #else |
| 1799 | usec = sec % 1000 * 1000; |
| 1800 | sec /= 1000; |
| 1801 | #endif |
| 1802 | } |
| 1803 | |
| 1804 | #ifdef subprocesses |
| 1805 | wait_reading_process_input (sec, usec, 0, 0); |
| 1806 | #else /* No subprocesses */ |
| 1807 | immediate_quit = 1; |
| 1808 | QUIT; |
| 1809 | |
| 1810 | #ifdef VMS |
| 1811 | sys_sleep (sec); |
| 1812 | #else /* not VMS */ |
| 1813 | /* The reason this is done this way |
| 1814 | (rather than defined (H_S) && defined (H_T)) |
| 1815 | is because the VMS preprocessor doesn't grok `defined' */ |
| 1816 | #ifdef HAVE_SELECT |
| 1817 | EMACS_GET_TIME (end_time); |
| 1818 | EMACS_SET_SECS_USECS (timeout, sec, usec); |
| 1819 | EMACS_ADD_TIME (end_time, timeout); |
| 1820 | |
| 1821 | while (1) |
| 1822 | { |
| 1823 | EMACS_GET_TIME (timeout); |
| 1824 | EMACS_SUB_TIME (timeout, end_time, timeout); |
| 1825 | if (EMACS_TIME_NEG_P (timeout) |
| 1826 | || !select (1, 0, 0, 0, &timeout)) |
| 1827 | break; |
| 1828 | } |
| 1829 | #else /* not HAVE_SELECT */ |
| 1830 | sleep (sec); |
| 1831 | #endif /* HAVE_SELECT */ |
| 1832 | #endif /* not VMS */ |
| 1833 | |
| 1834 | immediate_quit = 0; |
| 1835 | #endif /* no subprocesses */ |
| 1836 | |
| 1837 | return Qnil; |
| 1838 | } |
| 1839 | |
| 1840 | DEFUN ("sit-for", Fsit_for, Ssit_for, 1, 3, 0, |
| 1841 | "Perform redisplay, then wait for ARG seconds or until input is available.\n\ |
| 1842 | Optional second arg non-nil means ARG counts in milliseconds.\n\ |
| 1843 | Optional third arg non-nil means don't redisplay, just wait for input.\n\ |
| 1844 | Redisplay is preempted as always if input arrives, and does not happen\n\ |
| 1845 | if input is available before it starts.\n\ |
| 1846 | Value is t if waited the full time with no input arriving.") |
| 1847 | (n, millisec, nodisp) |
| 1848 | Lisp_Object n, millisec, nodisp; |
| 1849 | { |
| 1850 | #ifndef subprocesses |
| 1851 | EMACS_TIME timeout; |
| 1852 | int waitchannels; |
| 1853 | #endif /* no subprocesses */ |
| 1854 | int usec = 0; |
| 1855 | int sec; |
| 1856 | |
| 1857 | CHECK_NUMBER (n, 0); |
| 1858 | |
| 1859 | if (detect_input_pending ()) |
| 1860 | return Qnil; |
| 1861 | |
| 1862 | if (EQ (nodisp, Qnil)) |
| 1863 | redisplay_preserve_echo_area (); |
| 1864 | |
| 1865 | sec = XINT (n); |
| 1866 | if (sec <= 0) |
| 1867 | return Qt; |
| 1868 | |
| 1869 | if (!NILP (millisec)) |
| 1870 | { |
| 1871 | #ifndef EMACS_HAS_USECS |
| 1872 | error ("millisecond sleep-for not supported on %s", SYSTEM_TYPE); |
| 1873 | #else |
| 1874 | usec = sec % 1000 * 1000; |
| 1875 | sec /= 1000; |
| 1876 | #endif |
| 1877 | } |
| 1878 | |
| 1879 | #ifdef subprocesses |
| 1880 | #ifdef SIGIO |
| 1881 | gobble_input (); |
| 1882 | #endif /* SIGIO */ |
| 1883 | wait_reading_process_input (sec, usec, 1, 1); |
| 1884 | #else /* no subprocesses */ |
| 1885 | immediate_quit = 1; |
| 1886 | QUIT; |
| 1887 | |
| 1888 | waitchannels = 1; |
| 1889 | #ifdef VMS |
| 1890 | input_wait_timeout (XINT (n)); |
| 1891 | #else /* not VMS */ |
| 1892 | EMACS_SET_SECS_USECS (timeout, sec, usec); |
| 1893 | select (1, &waitchannels, 0, 0, &timeout); |
| 1894 | #endif /* not VMS */ |
| 1895 | |
| 1896 | immediate_quit = 0; |
| 1897 | #endif /* no subprocesses */ |
| 1898 | |
| 1899 | return detect_input_pending () ? Qnil : Qt; |
| 1900 | } |
| 1901 | |
| 1902 | DEFUN ("sleep-for-millisecs", Fsleep_for_millisecs, Ssleep_for_millisecs, |
| 1903 | 1, 1, 0, |
| 1904 | "Pause, without updating display, for ARG milliseconds.") |
| 1905 | (n) |
| 1906 | Lisp_Object n; |
| 1907 | { |
| 1908 | #ifndef EMACS_HAS_USECS |
| 1909 | error ("sleep-for-millisecs not supported on %s", SYSTEM_TYPE); |
| 1910 | #else |
| 1911 | CHECK_NUMBER (n, 0); |
| 1912 | wait_reading_process_input (XINT (n) / 1000, XINT (n) % 1000 * 1000, |
| 1913 | 0, 0); |
| 1914 | return Qnil; |
| 1915 | #endif /* EMACS_HAS_USECS */ |
| 1916 | } |
| 1917 | \f |
| 1918 | char *terminal_type; |
| 1919 | |
| 1920 | /* Initialization done when Emacs fork is started, before doing stty. */ |
| 1921 | /* Determine terminal type and set terminal_driver */ |
| 1922 | /* Then invoke its decoding routine to set up variables |
| 1923 | in the terminal package */ |
| 1924 | |
| 1925 | init_display () |
| 1926 | { |
| 1927 | #ifdef HAVE_X_WINDOWS |
| 1928 | extern int display_arg; |
| 1929 | #endif |
| 1930 | |
| 1931 | meta_key = 0; |
| 1932 | inverse_video = 0; |
| 1933 | cursor_in_echo_area = 0; |
| 1934 | terminal_type = (char *) 0; |
| 1935 | |
| 1936 | /* If the DISPLAY environment variable is set, try to use X, and |
| 1937 | die with an error message if that doesn't work. */ |
| 1938 | |
| 1939 | /* Check if we're using a window system here before trying to |
| 1940 | initialize the terminal. If we check the terminal first, |
| 1941 | |
| 1942 | If someone has indicated that they want |
| 1943 | to use a window system, we shouldn't bother initializing the |
| 1944 | terminal. This is especially important when the terminal is so |
| 1945 | dumb that emacs gives up before and doesn't bother using the window |
| 1946 | system. */ |
| 1947 | |
| 1948 | #ifdef HAVE_X_WINDOWS |
| 1949 | if (!inhibit_window_system && (display_arg || getenv ("DISPLAY"))) |
| 1950 | { |
| 1951 | Vwindow_system = intern ("x"); |
| 1952 | #ifdef HAVE_X11 |
| 1953 | Vwindow_system_version = make_number (11); |
| 1954 | #else |
| 1955 | Vwindow_system_version = make_number (10); |
| 1956 | #endif |
| 1957 | return; |
| 1958 | } |
| 1959 | #endif /* HAVE_X_WINDOWS */ |
| 1960 | |
| 1961 | /* If no window system has been specified, try to use the terminal. */ |
| 1962 | if (! isatty (0)) |
| 1963 | { |
| 1964 | fprintf (stderr, "emacs: standard input is not a tty\n"); |
| 1965 | exit (1); |
| 1966 | } |
| 1967 | |
| 1968 | /* Look at the TERM variable */ |
| 1969 | terminal_type = (char *) getenv ("TERM"); |
| 1970 | if (!terminal_type) |
| 1971 | { |
| 1972 | #ifdef VMS |
| 1973 | fprintf (stderr, "Please specify your terminal type.\n\ |
| 1974 | For types defined in VMS, use set term /device=TYPE.\n\ |
| 1975 | For types not defined in VMS, use define emacs_term \"TYPE\".\n\ |
| 1976 | \(The quotation marks are necessary since terminal types are lower case.)\n"); |
| 1977 | #else |
| 1978 | fprintf (stderr, "Please set the environment variable TERM; see tset(1).\n"); |
| 1979 | #endif |
| 1980 | exit (1); |
| 1981 | } |
| 1982 | |
| 1983 | #ifdef VMS |
| 1984 | /* VMS DCL tends to upcase things, so downcase term type. |
| 1985 | Hardly any uppercase letters in terminal types; should be none. */ |
| 1986 | { |
| 1987 | char *new = (char *) xmalloc (strlen (terminal_type) + 1); |
| 1988 | char *p; |
| 1989 | |
| 1990 | strcpy (new, terminal_type); |
| 1991 | |
| 1992 | for (p = new; *p; p++) |
| 1993 | if (isupper (*p)) |
| 1994 | *p = tolower (*p); |
| 1995 | |
| 1996 | terminal_type = new; |
| 1997 | } |
| 1998 | #endif |
| 1999 | |
| 2000 | term_init (terminal_type); |
| 2001 | |
| 2002 | remake_screen_glyphs (selected_screen); |
| 2003 | calculate_costs (selected_screen); |
| 2004 | |
| 2005 | /* X and Y coordinates of the cursor between updates. */ |
| 2006 | SCREEN_CURSOR_X (selected_screen) = 0; |
| 2007 | SCREEN_CURSOR_Y (selected_screen) = 0; |
| 2008 | |
| 2009 | #ifdef SIGWINCH |
| 2010 | #ifndef CANNOT_DUMP |
| 2011 | if (initialized) |
| 2012 | #endif /* CANNOT_DUMP */ |
| 2013 | signal (SIGWINCH, window_change_signal); |
| 2014 | #endif /* SIGWINCH */ |
| 2015 | } |
| 2016 | \f |
| 2017 | syms_of_display () |
| 2018 | { |
| 2019 | #ifdef MULTI_SCREEN |
| 2020 | defsubr (&Sredraw_screen); |
| 2021 | #endif |
| 2022 | defsubr (&Sredraw_display); |
| 2023 | defsubr (&Sopen_termscript); |
| 2024 | defsubr (&Sding); |
| 2025 | defsubr (&Ssit_for); |
| 2026 | defsubr (&Ssleep_for); |
| 2027 | defsubr (&Ssend_string_to_terminal); |
| 2028 | |
| 2029 | DEFVAR_INT ("baud-rate", &baud_rate, |
| 2030 | "The output baud rate of the terminal.\n\ |
| 2031 | On most systems, changing this value will affect the amount of padding\n\ |
| 2032 | and the other strategic decisions made during redisplay."); |
| 2033 | DEFVAR_BOOL ("inverse-video", &inverse_video, |
| 2034 | "*Non-nil means invert the entire screen display.\n\ |
| 2035 | This means everything is in inverse video which otherwise would not be."); |
| 2036 | DEFVAR_BOOL ("visible-bell", &visible_bell, |
| 2037 | "*Non-nil means try to flash the screen to represent a bell."); |
| 2038 | DEFVAR_BOOL ("no-redraw-on-reenter", &no_redraw_on_reenter, |
| 2039 | "*Non-nil means no need to redraw entire screen after suspending.\n\ |
| 2040 | A non-nil value is useful if the terminal can automatically preserve\n\ |
| 2041 | Emacs's screen display when you reenter Emacs.\n\ |
| 2042 | It is up to you to set this variable if your terminal can do that."); |
| 2043 | DEFVAR_LISP ("window-system", &Vwindow_system, |
| 2044 | "A symbol naming the window-system under which Emacs is running\n\ |
| 2045 | \(such as `x'), or nil if emacs is running on an ordinary terminal."); |
| 2046 | DEFVAR_LISP ("window-system-version", &Vwindow_system_version, |
| 2047 | "The version number of the window system in use.\n\ |
| 2048 | For X windows, this is 10 or 11."); |
| 2049 | DEFVAR_BOOL ("cursor-in-echo-area", &cursor_in_echo_area, |
| 2050 | "Non-nil means put cursor in minibuffer, at end of any message there."); |
| 2051 | DEFVAR_LISP ("glyph-table", &Vglyph_table, |
| 2052 | "Table defining how to output a glyph code to the screen.\n\ |
| 2053 | If not nil, this is a vector indexed by glyph code to define the glyph.\n\ |
| 2054 | Each element can be:\n\ |
| 2055 | integer: a glyph code which this glyph is an alias for.\n\ |
| 2056 | string: output this glyph using that string (not impl. in X windows).\n\ |
| 2057 | nil: this glyph mod 256 is char code to output,\n\ |
| 2058 | and this glyph / 256 is face code for X windows (see `x-set-face')."); |
| 2059 | Vglyph_table = Qnil; |
| 2060 | |
| 2061 | DEFVAR_LISP ("standard-display-table", &Vstandard_display_table, |
| 2062 | "Display table to use for buffers that specify none.\n\ |
| 2063 | See `buffer-display-table' for more information."); |
| 2064 | Vstandard_display_table = Qnil; |
| 2065 | |
| 2066 | /* Initialize `window-system', unless init_display already decided it. */ |
| 2067 | #ifdef CANNOT_DUMP |
| 2068 | if (noninteractive) |
| 2069 | #endif |
| 2070 | { |
| 2071 | Vwindow_system = Qnil; |
| 2072 | Vwindow_system_version = Qnil; |
| 2073 | } |
| 2074 | } |
| 2075 | |