| 1 | /* "Face" primitives. |
| 2 | Copyright (C) 1993 Free Software Foundation. |
| 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 2, 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 | /* This is derived from work by Lucid (some parts very loosely so). */ |
| 21 | |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/stat.h> |
| 24 | |
| 25 | #include <config.h> |
| 26 | #include "lisp.h" |
| 27 | |
| 28 | #ifdef HAVE_X_WINDOWS |
| 29 | |
| 30 | #include "xterm.h" |
| 31 | #include "buffer.h" |
| 32 | #include "dispextern.h" |
| 33 | #include "frame.h" |
| 34 | #include "blockinput.h" |
| 35 | #include "window.h" |
| 36 | |
| 37 | /* Compensate for bug in Xos.h on some systems, on which it requires |
| 38 | time.h. On some such systems, Xos.h tries to redefine struct |
| 39 | timeval and struct timezone if USG is #defined while it is |
| 40 | #included. */ |
| 41 | #ifdef XOS_NEEDS_TIME_H |
| 42 | |
| 43 | #include <time.h> |
| 44 | #undef USG |
| 45 | #include <X11/Xos.h> |
| 46 | #define USG |
| 47 | #define __TIMEVAL__ |
| 48 | |
| 49 | #else |
| 50 | |
| 51 | #include <X11/Xos.h> |
| 52 | |
| 53 | #endif |
| 54 | |
| 55 | \f |
| 56 | /* An explanation of the face data structures. */ |
| 57 | |
| 58 | /* ========================= Face Data Structures ========================= |
| 59 | |
| 60 | Let FACE-NAME be a symbol naming a face. |
| 61 | |
| 62 | Let FACE-VECTOR be (assq FACE-NAME (frame-face-alist FRAME)) |
| 63 | FACE-VECTOR is either nil, or a vector of the form |
| 64 | [face NAME ID FONT FOREGROUND BACKGROUND BACKGROUND-PIXMAP UNDERLINE-P] |
| 65 | where |
| 66 | face is the symbol `face', |
| 67 | NAME is the symbol with which this vector is associated (a backpointer), |
| 68 | ID is the face ID, an integer used internally by the C code to identify |
| 69 | the face, |
| 70 | FONT, FOREGROUND, and BACKGROUND are strings naming the fonts and colors |
| 71 | to use with the face, |
| 72 | BACKGROUND-PIXMAP is the name of an x bitmap filename, which we don't |
| 73 | use right now, and |
| 74 | UNDERLINE-P is non-nil if the face should be underlined. |
| 75 | If any of these elements are nil, that parameter is considered |
| 76 | unspecified; parameters from faces specified by lower-priority |
| 77 | overlays or text properties, or the parameters of the frame itself, |
| 78 | can show through. (lisp/faces.el maintains these lists.) |
| 79 | |
| 80 | (assq FACE-NAME global-face-data) returns a vector describing the |
| 81 | global parameters for that face. |
| 82 | |
| 83 | Let PARAM-FACE be FRAME->display.x->param_faces[Faref (FACE-VECTOR, 2)]. |
| 84 | PARAM_FACE is a struct face whose members are the Xlib analogues of |
| 85 | the parameters in FACE-VECTOR. If an element of FACE-VECTOR is |
| 86 | nil, then the corresponding member of PARAM_FACE is FACE_DEFAULT. |
| 87 | These faces are called "parameter faces", because they're the ones |
| 88 | lisp manipulates to control what gets displayed. Elements 0 and 1 |
| 89 | of FRAME->display.x->param_faces are special - they describe the |
| 90 | default and mode line faces. None of the faces in param_faces have |
| 91 | GC's. (See src/dispextern.h for the definiton of struct face. |
| 92 | lisp/faces.el maintains the isomorphism between face_alist and |
| 93 | param_faces.) |
| 94 | |
| 95 | The functions compute_char_face and compute_glyph_face find and |
| 96 | combine the parameter faces associated with overlays and text |
| 97 | properties. The resulting faces are called "computed faces"; none |
| 98 | of their members are FACE_DEFAULT; they are completely specified. |
| 99 | They then call intern_compute_face to search |
| 100 | FRAME->display.x->computed_faces for a matching face, add one if |
| 101 | none is found, and return the index into |
| 102 | FRAME->display.x->computed_faces. FRAME's glyph matrices use these |
| 103 | indices to record the faces of the matrix characters, and the X |
| 104 | display hooks consult compute_faces to decide how to display these |
| 105 | characters. Elements 0 and 1 of computed_faces always describe the |
| 106 | default and mode-line faces. |
| 107 | |
| 108 | Elements 0 and 1 of computed_faces have GC's; all the other faces |
| 109 | in computed_faces do not. The global array face_vector contains |
| 110 | faces with their GC's set. Given a computed_face, the function |
| 111 | intern_face finds (or adds) an element of face_vector with |
| 112 | equivalent parameters, and returns a pointer to that face, whose GC |
| 113 | can then be used for display. |
| 114 | |
| 115 | Constraints: |
| 116 | |
| 117 | Symbols naming faces must have associations on all frames; for any |
| 118 | FRAME, for all FACE-NAME, if (assq FACE-NAME (frame-face-alist |
| 119 | FRAME)) is non-nil, it must be non-nil for all frames. |
| 120 | |
| 121 | Analogously, indices into param_faces must be valid on all frames; |
| 122 | if param_faces[i] is a non-zero face pointer on one frame, then it |
| 123 | must be filled in on all frames. Code assumes that face ID's can |
| 124 | be used on any frame. |
| 125 | |
| 126 | Some subtleties: |
| 127 | |
| 128 | Why do we keep param_faces and computed_faces separate? |
| 129 | computed_faces contains an element for every combination of facial |
| 130 | parameters we have ever displayed. indices into param_faces have |
| 131 | to be valid on all frames. If they were the same array, then that |
| 132 | array would grow very large on all frames, because any facial |
| 133 | combination displayed on any frame would need to be a valid entry |
| 134 | on all frames. |
| 135 | |
| 136 | Since face_vector is just a cache --- there are no pointers into it |
| 137 | from the rest of the code, and everyone accesses it through |
| 138 | intern_face --- we could just free its GC's and throw the whole |
| 139 | thing away without breaking anything. This gives us a simple way |
| 140 | to garbage-collect old GC's nobody's using any more - we can just |
| 141 | purge face_vector, and then let subsequent calls to intern_face |
| 142 | refill it as needed. The function clear_face_vector performs this |
| 143 | purge. |
| 144 | |
| 145 | We're often applying intern_face to faces in computed_faces - |
| 146 | for example, we do this while sending GLYPHs from a struct |
| 147 | frame_glyphs to X during redisplay. It would be nice to avoid |
| 148 | searching all of face_vector every time we intern a frame's face. |
| 149 | So, when intern_face finds a match for FACE in face_vector, it |
| 150 | stores the index of the match in FACE's cached_index member, and |
| 151 | checks there first next time. */ |
| 152 | |
| 153 | \f |
| 154 | /* Definitions and declarations. */ |
| 155 | |
| 156 | /* A table of display faces. */ |
| 157 | static struct face **face_vector; |
| 158 | /* The length in use of the table. */ |
| 159 | static int nfaces; |
| 160 | /* The allocated length of the table. */ |
| 161 | static int nfaces_allocated; |
| 162 | |
| 163 | /* The number of face-id's in use (same for all frames). */ |
| 164 | int next_face_id; |
| 165 | |
| 166 | /* The number of the face to use to indicate the region. */ |
| 167 | int region_face; |
| 168 | |
| 169 | /* This is what appears in a slot in a face to signify that the face |
| 170 | does not specify that display aspect. */ |
| 171 | #define FACE_DEFAULT (~0) |
| 172 | |
| 173 | Lisp_Object Qface; |
| 174 | |
| 175 | static void build_face ( /* FRAME_PTR, struct face * */ ); |
| 176 | int face_name_id_number ( /* FRAME_PTR, Lisp_Object name */ ); |
| 177 | |
| 178 | struct face *intern_face ( /* FRAME_PTR, struct face * */ ); |
| 179 | static int new_computed_face ( /* FRAME_PTR, struct face * */ ); |
| 180 | static int intern_computed_face ( /* FRAME_PTR, struct face * */ ); |
| 181 | static void ensure_face_ready ( /* FRAME_PTR, int id */ ); |
| 182 | void recompute_basic_faces ( /* FRAME_PTR f */ ); |
| 183 | \f |
| 184 | /* Allocating, copying, and comparing struct faces. */ |
| 185 | |
| 186 | /* Allocate a new face */ |
| 187 | static struct face * |
| 188 | allocate_face () |
| 189 | { |
| 190 | struct face *result = (struct face *) xmalloc (sizeof (struct face)); |
| 191 | bzero (result, sizeof (struct face)); |
| 192 | result->font = (XFontStruct *) FACE_DEFAULT; |
| 193 | result->foreground = FACE_DEFAULT; |
| 194 | result->background = FACE_DEFAULT; |
| 195 | result->stipple = FACE_DEFAULT; |
| 196 | return result; |
| 197 | } |
| 198 | |
| 199 | /* Make a new face that's a copy of an existing one. */ |
| 200 | static struct face * |
| 201 | copy_face (face) |
| 202 | struct face *face; |
| 203 | { |
| 204 | struct face *result = allocate_face (); |
| 205 | |
| 206 | result->font = face->font; |
| 207 | result->foreground = face->foreground; |
| 208 | result->background = face->background; |
| 209 | result->stipple = face->stipple; |
| 210 | result->underline = face->underline; |
| 211 | |
| 212 | return result; |
| 213 | } |
| 214 | |
| 215 | static int |
| 216 | face_eql (face1, face2) |
| 217 | struct face *face1, *face2; |
| 218 | { |
| 219 | return ( face1->font == face2->font |
| 220 | && face1->foreground == face2->foreground |
| 221 | && face1->background == face2->background |
| 222 | && face1->stipple == face2->stipple |
| 223 | && face1->underline == face2->underline); |
| 224 | } |
| 225 | \f |
| 226 | /* Interning faces in the `face_vector' cache, and clearing that cache. */ |
| 227 | |
| 228 | /* Return the unique display face corresponding to the user-level face FACE. |
| 229 | If there isn't one, make one, and find a slot in the face_vector to |
| 230 | put it in. */ |
| 231 | static struct face * |
| 232 | get_cached_face (f, face) |
| 233 | struct frame *f; |
| 234 | struct face *face; |
| 235 | { |
| 236 | int i, empty = -1; |
| 237 | struct face *result; |
| 238 | |
| 239 | /* Perhaps FACE->cached_index is valid; this could happen if FACE is |
| 240 | in a frame's face list. */ |
| 241 | if (face->cached_index >= 0 |
| 242 | && face->cached_index < nfaces |
| 243 | && face_eql (face_vector[face->cached_index], face)) |
| 244 | return face_vector[face->cached_index]; |
| 245 | |
| 246 | /* Look for an existing display face that does the job. |
| 247 | Also find an empty slot if any. */ |
| 248 | for (i = 0; i < nfaces; i++) |
| 249 | { |
| 250 | if (face_eql (face_vector[i], face)) |
| 251 | return face_vector[i]; |
| 252 | if (face_vector[i] == 0) |
| 253 | empty = i; |
| 254 | } |
| 255 | |
| 256 | /* If no empty slots, make one. */ |
| 257 | if (empty < 0 && nfaces == nfaces_allocated) |
| 258 | { |
| 259 | int newsize = nfaces + 20; |
| 260 | face_vector |
| 261 | = (struct face **) xrealloc (face_vector, |
| 262 | newsize * sizeof (struct face *)); |
| 263 | nfaces_allocated = newsize; |
| 264 | } |
| 265 | |
| 266 | if (empty < 0) |
| 267 | empty = nfaces++; |
| 268 | |
| 269 | /* Put a new display face in the empty slot. */ |
| 270 | result = copy_face (face); |
| 271 | face_vector[empty] = result; |
| 272 | |
| 273 | /* Make a graphics context for it. */ |
| 274 | build_face (f, result); |
| 275 | |
| 276 | return result; |
| 277 | } |
| 278 | |
| 279 | /* Given a computed face, return an equivalent display face |
| 280 | (one which has a graphics context). */ |
| 281 | |
| 282 | struct face * |
| 283 | intern_face (f, face) |
| 284 | struct frame *f; |
| 285 | struct face *face; |
| 286 | { |
| 287 | /* If it's equivalent to the default face, use that. */ |
| 288 | if (face_eql (face, FRAME_DEFAULT_FACE (f))) |
| 289 | { |
| 290 | if (!FRAME_DEFAULT_FACE (f)->gc) |
| 291 | build_face (f, FRAME_DEFAULT_FACE (f)); |
| 292 | return FRAME_DEFAULT_FACE (f); |
| 293 | } |
| 294 | |
| 295 | /* If it's equivalent to the mode line face, use that. */ |
| 296 | if (face_eql (face, FRAME_MODE_LINE_FACE (f))) |
| 297 | { |
| 298 | if (!FRAME_MODE_LINE_FACE (f)->gc) |
| 299 | build_face (f, FRAME_MODE_LINE_FACE (f)); |
| 300 | return FRAME_MODE_LINE_FACE (f); |
| 301 | } |
| 302 | |
| 303 | /* If it's not one of the frame's default faces, it shouldn't have a GC. */ |
| 304 | if (face->gc) |
| 305 | abort (); |
| 306 | |
| 307 | /* Get a specialized display face. */ |
| 308 | return get_cached_face (f, face); |
| 309 | } |
| 310 | |
| 311 | /* Clear out face_vector and start anew. |
| 312 | This should be done from time to time just to avoid |
| 313 | keeping too many graphics contexts in face_vector |
| 314 | that are no longer needed. */ |
| 315 | |
| 316 | void |
| 317 | clear_face_vector () |
| 318 | { |
| 319 | Lisp_Object rest; |
| 320 | Display *dpy = x_current_display; |
| 321 | int i; |
| 322 | |
| 323 | BLOCK_INPUT; |
| 324 | /* Free the display faces in the face_vector. */ |
| 325 | for (i = 0; i < nfaces; i++) |
| 326 | { |
| 327 | struct face *face = face_vector[i]; |
| 328 | if (face->gc) |
| 329 | XFreeGC (dpy, face->gc); |
| 330 | xfree (face); |
| 331 | } |
| 332 | nfaces = 0; |
| 333 | |
| 334 | UNBLOCK_INPUT; |
| 335 | } |
| 336 | \f |
| 337 | /* Allocating and freeing X resources for display faces. */ |
| 338 | |
| 339 | /* Make a graphics context for face FACE, which is on frame F, |
| 340 | if that can be done. */ |
| 341 | static void |
| 342 | build_face (f, face) |
| 343 | struct frame *f; |
| 344 | struct face *face; |
| 345 | { |
| 346 | GC gc; |
| 347 | XGCValues xgcv; |
| 348 | unsigned long mask; |
| 349 | |
| 350 | BLOCK_INPUT; |
| 351 | |
| 352 | if (face->foreground != FACE_DEFAULT) |
| 353 | xgcv.foreground = face->foreground; |
| 354 | else |
| 355 | xgcv.foreground = f->display.x->foreground_pixel; |
| 356 | |
| 357 | if (face->background != FACE_DEFAULT) |
| 358 | xgcv.background = face->background; |
| 359 | else |
| 360 | xgcv.background = f->display.x->background_pixel; |
| 361 | |
| 362 | if (face->font && (int) face->font != FACE_DEFAULT) |
| 363 | xgcv.font = face->font->fid; |
| 364 | else |
| 365 | xgcv.font = f->display.x->font->fid; |
| 366 | |
| 367 | xgcv.graphics_exposures = 0; |
| 368 | |
| 369 | mask = GCForeground | GCBackground | GCFont | GCGraphicsExposures; |
| 370 | gc = XCreateGC (x_current_display, FRAME_X_WINDOW (f), |
| 371 | mask, &xgcv); |
| 372 | |
| 373 | #if 0 |
| 374 | if (face->stipple && face->stipple != FACE_DEFAULT) |
| 375 | XSetStipple (x_current_display, gc, face->stipple); |
| 376 | #endif |
| 377 | |
| 378 | face->gc = gc; |
| 379 | |
| 380 | UNBLOCK_INPUT; |
| 381 | } |
| 382 | |
| 383 | /* Allocating, freeing, and duplicating fonts, colors, and pixmaps. */ |
| 384 | |
| 385 | static XFontStruct * |
| 386 | load_font (f, name) |
| 387 | struct frame *f; |
| 388 | Lisp_Object name; |
| 389 | { |
| 390 | XFontStruct *font; |
| 391 | |
| 392 | if (NILP (name)) |
| 393 | return (XFontStruct *) FACE_DEFAULT; |
| 394 | |
| 395 | CHECK_STRING (name, 0); |
| 396 | BLOCK_INPUT; |
| 397 | font = XLoadQueryFont (x_current_display, (char *) XSTRING (name)->data); |
| 398 | UNBLOCK_INPUT; |
| 399 | |
| 400 | if (! font) |
| 401 | Fsignal (Qerror, Fcons (build_string ("undefined font"), |
| 402 | Fcons (name, Qnil))); |
| 403 | return font; |
| 404 | } |
| 405 | |
| 406 | static void |
| 407 | unload_font (f, font) |
| 408 | struct frame *f; |
| 409 | XFontStruct *font; |
| 410 | { |
| 411 | if (!font || font == ((XFontStruct *) FACE_DEFAULT)) |
| 412 | return; |
| 413 | |
| 414 | BLOCK_INPUT; |
| 415 | XFreeFont (x_current_display, font); |
| 416 | UNBLOCK_INPUT; |
| 417 | } |
| 418 | |
| 419 | static unsigned long |
| 420 | load_color (f, name) |
| 421 | struct frame *f; |
| 422 | Lisp_Object name; |
| 423 | { |
| 424 | Display *dpy = x_current_display; |
| 425 | Colormap cmap; |
| 426 | XColor color; |
| 427 | int result; |
| 428 | |
| 429 | if (NILP (name)) |
| 430 | return FACE_DEFAULT; |
| 431 | |
| 432 | cmap = DefaultColormapOfScreen (DefaultScreenOfDisplay (x_current_display)); |
| 433 | |
| 434 | CHECK_STRING (name, 0); |
| 435 | BLOCK_INPUT; |
| 436 | result = XParseColor (dpy, cmap, (char *) XSTRING (name)->data, &color); |
| 437 | UNBLOCK_INPUT; |
| 438 | if (! result) |
| 439 | Fsignal (Qerror, Fcons (build_string ("undefined color"), |
| 440 | Fcons (name, Qnil))); |
| 441 | BLOCK_INPUT; |
| 442 | result = XAllocColor (dpy, cmap, &color); |
| 443 | UNBLOCK_INPUT; |
| 444 | if (! result) |
| 445 | Fsignal (Qerror, Fcons (build_string ("X server cannot allocate color"), |
| 446 | Fcons (name, Qnil))); |
| 447 | return (unsigned long) color.pixel; |
| 448 | } |
| 449 | |
| 450 | static void |
| 451 | unload_color (f, pixel) |
| 452 | struct frame *f; |
| 453 | unsigned long pixel; |
| 454 | { |
| 455 | /* Since faces get built by copying parameters from other faces, the |
| 456 | allocation counts for the colors get all screwed up. I don't see |
| 457 | any solution that will take less than 10 minutes, and it's better |
| 458 | to have a color leak than a crash, so I'm just dyking this out. |
| 459 | This isn't really a color leak, anyway - if we ask for it again, |
| 460 | we'll get the same pixel. */ |
| 461 | #if 0 |
| 462 | Colormap cmap; |
| 463 | Display *dpy = x_current_display; |
| 464 | if (pixel == FACE_DEFAULT |
| 465 | || pixel == BLACK_PIX_DEFAULT |
| 466 | || pixel == WHITE_PIX_DEFAULT) |
| 467 | return; |
| 468 | cmap = DefaultColormapOfScreen (DefaultScreenOfDisplay (x_current_display)); |
| 469 | BLOCK_INPUT; |
| 470 | XFreeColors (dpy, cmap, &pixel, 1, 0); |
| 471 | UNBLOCK_INPUT; |
| 472 | #endif |
| 473 | } |
| 474 | \f |
| 475 | /* Managing parameter face arrays for frames. */ |
| 476 | |
| 477 | void |
| 478 | init_frame_faces (f) |
| 479 | FRAME_PTR f; |
| 480 | { |
| 481 | ensure_face_ready (f, 0); |
| 482 | ensure_face_ready (f, 1); |
| 483 | |
| 484 | FRAME_N_COMPUTED_FACES (f) = 0; |
| 485 | FRAME_SIZE_COMPUTED_FACES (f) = 0; |
| 486 | |
| 487 | new_computed_face (f, FRAME_PARAM_FACES (f)[0]); |
| 488 | new_computed_face (f, FRAME_PARAM_FACES (f)[1]); |
| 489 | recompute_basic_faces (f); |
| 490 | |
| 491 | /* Find another X frame. */ |
| 492 | { |
| 493 | Lisp_Object tail, frame, result; |
| 494 | |
| 495 | result = Qnil; |
| 496 | FOR_EACH_FRAME (tail, frame) |
| 497 | if (FRAME_X_P (XFRAME (frame)) |
| 498 | && XFRAME (frame) != f) |
| 499 | { |
| 500 | result = frame; |
| 501 | break; |
| 502 | } |
| 503 | |
| 504 | /* If we didn't find any X frames other than f, then we don't need |
| 505 | any faces other than 0 and 1, so we're okay. Otherwise, make |
| 506 | sure that all faces valid on the selected frame are also valid |
| 507 | on this new frame. */ |
| 508 | if (FRAMEP (result)) |
| 509 | { |
| 510 | int i; |
| 511 | int n_faces = FRAME_N_PARAM_FACES (XFRAME (result)); |
| 512 | struct face **faces = FRAME_PARAM_FACES (XFRAME (result)); |
| 513 | |
| 514 | for (i = 2; i < n_faces; i++) |
| 515 | if (faces[i]) |
| 516 | ensure_face_ready (f, i); |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | |
| 522 | /* Called from Fdelete_frame. */ |
| 523 | void |
| 524 | free_frame_faces (f) |
| 525 | struct frame *f; |
| 526 | { |
| 527 | Display *dpy = x_current_display; |
| 528 | int i; |
| 529 | |
| 530 | BLOCK_INPUT; |
| 531 | |
| 532 | for (i = 0; i < FRAME_N_PARAM_FACES (f); i++) |
| 533 | { |
| 534 | struct face *face = FRAME_PARAM_FACES (f) [i]; |
| 535 | if (face) |
| 536 | { |
| 537 | if (face->gc) |
| 538 | XFreeGC (dpy, face->gc); |
| 539 | unload_font (f, face->font); |
| 540 | unload_color (f, face->foreground); |
| 541 | unload_color (f, face->background); |
| 542 | #if 0 |
| 543 | unload_pixmap (f, face->stipple); |
| 544 | #endif |
| 545 | xfree (face); |
| 546 | } |
| 547 | } |
| 548 | xfree (FRAME_PARAM_FACES (f)); |
| 549 | FRAME_PARAM_FACES (f) = 0; |
| 550 | FRAME_N_PARAM_FACES (f) = 0; |
| 551 | |
| 552 | /* All faces in FRAME_COMPUTED_FACES use resources copied from |
| 553 | FRAME_PARAM_FACES; we can free them without fuss. */ |
| 554 | xfree (FRAME_COMPUTED_FACES (f)); |
| 555 | FRAME_COMPUTED_FACES (f) = 0; |
| 556 | FRAME_N_COMPUTED_FACES (f) = 0; |
| 557 | |
| 558 | UNBLOCK_INPUT; |
| 559 | } |
| 560 | \f |
| 561 | /* Interning faces in a frame's face array. */ |
| 562 | |
| 563 | static int |
| 564 | new_computed_face (f, new_face) |
| 565 | struct frame *f; |
| 566 | struct face *new_face; |
| 567 | { |
| 568 | int i = FRAME_N_COMPUTED_FACES (f); |
| 569 | |
| 570 | if (i >= FRAME_SIZE_COMPUTED_FACES (f)) |
| 571 | { |
| 572 | int new_size = i + 32; |
| 573 | |
| 574 | FRAME_COMPUTED_FACES (f) |
| 575 | = (struct face **) (FRAME_SIZE_COMPUTED_FACES (f) == 0 |
| 576 | ? xmalloc (new_size * sizeof (struct face *)) |
| 577 | : xrealloc (FRAME_COMPUTED_FACES (f), |
| 578 | new_size * sizeof (struct face *))); |
| 579 | FRAME_SIZE_COMPUTED_FACES (f) = new_size; |
| 580 | } |
| 581 | |
| 582 | i = FRAME_N_COMPUTED_FACES (f)++; |
| 583 | FRAME_COMPUTED_FACES (f)[i] = copy_face (new_face); |
| 584 | return i; |
| 585 | } |
| 586 | |
| 587 | |
| 588 | /* Find a match for NEW_FACE in a FRAME's computed face array, and add |
| 589 | it if we don't find one. */ |
| 590 | static int |
| 591 | intern_computed_face (f, new_face) |
| 592 | struct frame *f; |
| 593 | struct face *new_face; |
| 594 | { |
| 595 | int len = FRAME_N_COMPUTED_FACES (f); |
| 596 | int i; |
| 597 | |
| 598 | /* Search for a computed face already on F equivalent to FACE. */ |
| 599 | for (i = 0; i < len; i++) |
| 600 | { |
| 601 | if (! FRAME_COMPUTED_FACES (f)[i]) |
| 602 | abort (); |
| 603 | if (face_eql (new_face, FRAME_COMPUTED_FACES (f)[i])) |
| 604 | return i; |
| 605 | } |
| 606 | |
| 607 | /* We didn't find one; add a new one. */ |
| 608 | return new_computed_face (f, new_face); |
| 609 | } |
| 610 | |
| 611 | /* Make parameter face id ID valid on frame F. */ |
| 612 | |
| 613 | static void |
| 614 | ensure_face_ready (f, id) |
| 615 | struct frame *f; |
| 616 | int id; |
| 617 | { |
| 618 | if (FRAME_N_PARAM_FACES (f) <= id) |
| 619 | { |
| 620 | int n = id + 10; |
| 621 | int i; |
| 622 | if (!FRAME_N_PARAM_FACES (f)) |
| 623 | FRAME_PARAM_FACES (f) |
| 624 | = (struct face **) xmalloc (sizeof (struct face *) * n); |
| 625 | else |
| 626 | FRAME_PARAM_FACES (f) |
| 627 | = (struct face **) xrealloc (FRAME_PARAM_FACES (f), |
| 628 | sizeof (struct face *) * n); |
| 629 | |
| 630 | bzero (FRAME_PARAM_FACES (f) + FRAME_N_PARAM_FACES (f), |
| 631 | (n - FRAME_N_PARAM_FACES (f)) * sizeof (struct face *)); |
| 632 | FRAME_N_PARAM_FACES (f) = n; |
| 633 | } |
| 634 | |
| 635 | if (FRAME_PARAM_FACES (f) [id] == 0) |
| 636 | FRAME_PARAM_FACES (f) [id] = allocate_face (); |
| 637 | } |
| 638 | \f |
| 639 | /* Computing faces appropriate for a given piece of text in a buffer. */ |
| 640 | |
| 641 | /* Return non-zero if FONT1 and FONT2 have the same size bounding box. |
| 642 | We assume that they're both character-cell fonts. */ |
| 643 | int |
| 644 | same_size_fonts (font1, font2) |
| 645 | XFontStruct *font1, *font2; |
| 646 | { |
| 647 | XCharStruct *bounds1 = &font1->min_bounds; |
| 648 | XCharStruct *bounds2 = &font2->min_bounds; |
| 649 | |
| 650 | return (bounds1->width == bounds2->width); |
| 651 | /* Checking the following caused bad results in some cases |
| 652 | when fonts that should be the same size |
| 653 | actually have very slightly different size. |
| 654 | It is possible that this reintroduces the bug whereby line positions |
| 655 | were not right. However, the right way to fix that is to change xterm.c |
| 656 | so that the vertical positions of lines |
| 657 | depend only on the height of the frame's font. |
| 658 | && bounds1->ascent == bounds2->ascent |
| 659 | && bounds1->descent == bounds2->descent); */ |
| 660 | } |
| 661 | |
| 662 | /* Modify face TO by copying from FROM all properties which have |
| 663 | nondefault settings. */ |
| 664 | static void |
| 665 | merge_faces (from, to) |
| 666 | struct face *from, *to; |
| 667 | { |
| 668 | /* Only merge the font if it's the same size as the base font. */ |
| 669 | if (from->font != (XFontStruct *) FACE_DEFAULT |
| 670 | && same_size_fonts (from->font, to->font)) |
| 671 | to->font = from->font; |
| 672 | if (from->foreground != FACE_DEFAULT) |
| 673 | to->foreground = from->foreground; |
| 674 | if (from->background != FACE_DEFAULT) |
| 675 | to->background = from->background; |
| 676 | if (from->stipple != FACE_DEFAULT) |
| 677 | to->stipple = from->stipple; |
| 678 | if (from->underline) |
| 679 | to->underline = from->underline; |
| 680 | } |
| 681 | |
| 682 | /* Set up the basic set of facial parameters, based on the frame's |
| 683 | data; all faces are deltas applied to this. */ |
| 684 | static void |
| 685 | compute_base_face (f, face) |
| 686 | FRAME_PTR f; |
| 687 | struct face *face; |
| 688 | { |
| 689 | struct x_display *d = f->display.x; |
| 690 | |
| 691 | face->gc = 0; |
| 692 | face->foreground = d->foreground_pixel; |
| 693 | face->background = d->background_pixel; |
| 694 | face->font = d->font; |
| 695 | face->stipple = 0; |
| 696 | face->underline = 0; |
| 697 | |
| 698 | /* Avoid a face comparison by making this invalid. */ |
| 699 | face->cached_index = -1; |
| 700 | } |
| 701 | |
| 702 | |
| 703 | /* Return the face ID associated with a buffer position POS. |
| 704 | Store into *ENDPTR the position at which a different face is needed. |
| 705 | This does not take account of glyphs that specify their own face codes. |
| 706 | F is the frame in use for display, and W is a window displaying |
| 707 | the current buffer. |
| 708 | |
| 709 | REGION_BEG, REGION_END delimit the region, so it can be highlighted. |
| 710 | |
| 711 | LIMIT is a position not to scan beyond. That is to limit |
| 712 | the time this function can take. */ |
| 713 | |
| 714 | int |
| 715 | compute_char_face (f, w, pos, region_beg, region_end, endptr, limit) |
| 716 | struct frame *f; |
| 717 | struct window *w; |
| 718 | int pos; |
| 719 | int region_beg, region_end; |
| 720 | int *endptr; |
| 721 | int limit; |
| 722 | { |
| 723 | struct face face; |
| 724 | Lisp_Object prop, position; |
| 725 | int i, j, noverlays; |
| 726 | int facecode; |
| 727 | Lisp_Object *overlay_vec; |
| 728 | Lisp_Object frame; |
| 729 | int endpos; |
| 730 | |
| 731 | /* W must display the current buffer. We could write this function |
| 732 | to use the frame and buffer of W, but right now it doesn't. */ |
| 733 | if (XBUFFER (w->buffer) != current_buffer) |
| 734 | abort (); |
| 735 | |
| 736 | XSET (frame, Lisp_Frame, f); |
| 737 | |
| 738 | endpos = ZV; |
| 739 | if (pos < region_beg && region_beg < endpos) |
| 740 | endpos = region_beg; |
| 741 | |
| 742 | XFASTINT (position) = pos; |
| 743 | prop = Fget_text_property (position, Qface, w->buffer); |
| 744 | { |
| 745 | Lisp_Object limit1, end; |
| 746 | |
| 747 | XFASTINT (limit1) = (limit < endpos ? limit : endpos); |
| 748 | end = Fnext_single_property_change (position, Qface, w->buffer, limit1); |
| 749 | if (INTEGERP (end)) |
| 750 | endpos = XINT (end); |
| 751 | } |
| 752 | |
| 753 | { |
| 754 | int next_overlay; |
| 755 | int len; |
| 756 | |
| 757 | /* First try with room for 40 overlays. */ |
| 758 | len = 40; |
| 759 | overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object)); |
| 760 | |
| 761 | noverlays = overlays_at (pos, 0, &overlay_vec, &len, &next_overlay); |
| 762 | |
| 763 | /* If there are more than 40, |
| 764 | make enough space for all, and try again. */ |
| 765 | if (noverlays > len) |
| 766 | { |
| 767 | len = noverlays; |
| 768 | overlay_vec = (Lisp_Object *) alloca (len * sizeof (Lisp_Object)); |
| 769 | noverlays = overlays_at (pos, 0, &overlay_vec, &len, &next_overlay); |
| 770 | } |
| 771 | |
| 772 | if (next_overlay < endpos) |
| 773 | endpos = next_overlay; |
| 774 | } |
| 775 | |
| 776 | *endptr = endpos; |
| 777 | |
| 778 | /* Optimize the default case. */ |
| 779 | if (noverlays == 0 && NILP (prop) |
| 780 | && !(pos >= region_beg && pos < region_end)) |
| 781 | return 0; |
| 782 | |
| 783 | compute_base_face (f, &face); |
| 784 | |
| 785 | if (!NILP (prop)) |
| 786 | { |
| 787 | facecode = face_name_id_number (f, prop); |
| 788 | if (facecode >= 0 && facecode < FRAME_N_PARAM_FACES (f) |
| 789 | && FRAME_PARAM_FACES (f) [facecode] != 0) |
| 790 | merge_faces (FRAME_PARAM_FACES (f) [facecode], &face); |
| 791 | } |
| 792 | |
| 793 | noverlays = sort_overlays (overlay_vec, noverlays, w); |
| 794 | |
| 795 | /* Now merge the overlay data in that order. */ |
| 796 | for (i = 0; i < noverlays; i++) |
| 797 | { |
| 798 | prop = Foverlay_get (overlay_vec[i], Qface); |
| 799 | if (!NILP (prop)) |
| 800 | { |
| 801 | Lisp_Object oend; |
| 802 | int oendpos; |
| 803 | |
| 804 | facecode = face_name_id_number (f, prop); |
| 805 | if (facecode >= 0 && facecode < FRAME_N_PARAM_FACES (f) |
| 806 | && FRAME_PARAM_FACES (f) [facecode] != 0) |
| 807 | merge_faces (FRAME_PARAM_FACES (f) [facecode], &face); |
| 808 | |
| 809 | oend = OVERLAY_END (overlay_vec[i]); |
| 810 | oendpos = OVERLAY_POSITION (oend); |
| 811 | if (oendpos < endpos) |
| 812 | endpos = oendpos; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | if (pos >= region_beg && pos < region_end) |
| 817 | { |
| 818 | if (region_end < endpos) |
| 819 | endpos = region_end; |
| 820 | if (region_face >= 0 && region_face < next_face_id) |
| 821 | merge_faces (FRAME_PARAM_FACES (f) [region_face], &face); |
| 822 | } |
| 823 | |
| 824 | *endptr = endpos; |
| 825 | |
| 826 | return intern_computed_face (f, &face); |
| 827 | } |
| 828 | |
| 829 | /* Return the face ID to use to display a special glyph which selects |
| 830 | FACE_CODE as the face ID, assuming that ordinarily the face would |
| 831 | be CURRENT_FACE. F is the frame. */ |
| 832 | |
| 833 | int |
| 834 | compute_glyph_face (f, face_code, current_face) |
| 835 | struct frame *f; |
| 836 | int face_code, current_face; |
| 837 | { |
| 838 | struct face face; |
| 839 | |
| 840 | face = *FRAME_COMPUTED_FACES (f)[current_face]; |
| 841 | |
| 842 | if (face_code >= 0 && face_code < FRAME_N_PARAM_FACES (f) |
| 843 | && FRAME_PARAM_FACES (f) [face_code] != 0) |
| 844 | merge_faces (FRAME_PARAM_FACES (f) [face_code], &face); |
| 845 | |
| 846 | return intern_computed_face (f, &face); |
| 847 | } |
| 848 | |
| 849 | |
| 850 | /* Recompute the GC's for the default and modeline faces. |
| 851 | We call this after changing frame parameters on which those GC's |
| 852 | depend. */ |
| 853 | |
| 854 | void |
| 855 | recompute_basic_faces (f) |
| 856 | FRAME_PTR f; |
| 857 | { |
| 858 | /* If the frame's faces haven't been initialized yet, don't worry about |
| 859 | this stuff. */ |
| 860 | if (FRAME_N_PARAM_FACES (f) < 2) |
| 861 | return; |
| 862 | |
| 863 | BLOCK_INPUT; |
| 864 | |
| 865 | if (FRAME_DEFAULT_FACE (f)->gc) |
| 866 | XFreeGC (x_current_display, FRAME_DEFAULT_FACE (f)->gc); |
| 867 | if (FRAME_MODE_LINE_FACE (f)->gc) |
| 868 | XFreeGC (x_current_display, FRAME_MODE_LINE_FACE (f)->gc); |
| 869 | |
| 870 | compute_base_face (f, FRAME_DEFAULT_FACE (f)); |
| 871 | compute_base_face (f, FRAME_MODE_LINE_FACE (f)); |
| 872 | |
| 873 | merge_faces (FRAME_DEFAULT_PARAM_FACE (f), FRAME_DEFAULT_FACE (f)); |
| 874 | merge_faces (FRAME_MODE_LINE_PARAM_FACE (f), FRAME_MODE_LINE_FACE (f)); |
| 875 | |
| 876 | build_face (f, FRAME_DEFAULT_FACE (f)); |
| 877 | build_face (f, FRAME_MODE_LINE_FACE (f)); |
| 878 | |
| 879 | UNBLOCK_INPUT; |
| 880 | } |
| 881 | |
| 882 | |
| 883 | \f |
| 884 | /* Lisp interface. */ |
| 885 | |
| 886 | DEFUN ("frame-face-alist", Fframe_face_alist, Sframe_face_alist, 1, 1, 0, |
| 887 | "") |
| 888 | (frame) |
| 889 | Lisp_Object frame; |
| 890 | { |
| 891 | CHECK_FRAME (frame, 0); |
| 892 | return XFRAME (frame)->face_alist; |
| 893 | } |
| 894 | |
| 895 | DEFUN ("set-frame-face-alist", Fset_frame_face_alist, Sset_frame_face_alist, |
| 896 | 2, 2, 0, "") |
| 897 | (frame, value) |
| 898 | Lisp_Object frame, value; |
| 899 | { |
| 900 | CHECK_FRAME (frame, 0); |
| 901 | XFRAME (frame)->face_alist = value; |
| 902 | return value; |
| 903 | } |
| 904 | |
| 905 | |
| 906 | DEFUN ("make-face-internal", Fmake_face_internal, Smake_face_internal, 1, 1, 0, |
| 907 | "Create face number FACE-ID on all frames.") |
| 908 | (face_id) |
| 909 | Lisp_Object face_id; |
| 910 | { |
| 911 | Lisp_Object rest; |
| 912 | int id = XINT (face_id); |
| 913 | |
| 914 | CHECK_NUMBER (face_id, 0); |
| 915 | if (id < 0 || id >= next_face_id) |
| 916 | error ("Face id out of range"); |
| 917 | |
| 918 | for (rest = Vframe_list; !NILP (rest); rest = XCONS (rest)->cdr) |
| 919 | { |
| 920 | struct frame *f = XFRAME (XCONS (rest)->car); |
| 921 | if (FRAME_X_P (f)) |
| 922 | ensure_face_ready (f, id); |
| 923 | } |
| 924 | return Qnil; |
| 925 | } |
| 926 | |
| 927 | |
| 928 | DEFUN ("set-face-attribute-internal", Fset_face_attribute_internal, |
| 929 | Sset_face_attribute_internal, 4, 4, 0, "") |
| 930 | (face_id, attr_name, attr_value, frame) |
| 931 | Lisp_Object face_id, attr_name, attr_value, frame; |
| 932 | { |
| 933 | struct face *face; |
| 934 | struct frame *f; |
| 935 | int magic_p; |
| 936 | int id; |
| 937 | |
| 938 | CHECK_FRAME (frame, 0); |
| 939 | CHECK_NUMBER (face_id, 0); |
| 940 | CHECK_SYMBOL (attr_name, 0); |
| 941 | |
| 942 | f = XFRAME (frame); |
| 943 | id = XINT (face_id); |
| 944 | if (id < 0 || id >= next_face_id) |
| 945 | error ("Face id out of range"); |
| 946 | |
| 947 | if (! FRAME_X_P (f)) |
| 948 | return; |
| 949 | |
| 950 | ensure_face_ready (f, id); |
| 951 | face = FRAME_PARAM_FACES (f) [XFASTINT (face_id)]; |
| 952 | |
| 953 | if (EQ (attr_name, intern ("font"))) |
| 954 | { |
| 955 | XFontStruct *font = load_font (f, attr_value); |
| 956 | if (face->font != f->display.x->font) |
| 957 | unload_font (f, face->font); |
| 958 | face->font = font; |
| 959 | } |
| 960 | else if (EQ (attr_name, intern ("foreground"))) |
| 961 | { |
| 962 | unsigned long new_color = load_color (f, attr_value); |
| 963 | unload_color (f, face->foreground); |
| 964 | face->foreground = new_color; |
| 965 | } |
| 966 | else if (EQ (attr_name, intern ("background"))) |
| 967 | { |
| 968 | unsigned long new_color = load_color (f, attr_value); |
| 969 | unload_color (f, face->background); |
| 970 | face->background = new_color; |
| 971 | } |
| 972 | #if 0 |
| 973 | else if (EQ (attr_name, intern ("background-pixmap"))) |
| 974 | { |
| 975 | unsigned int w, h, d; |
| 976 | unsigned long new_pixmap = load_pixmap (f, attr_value, &w, &h, &d, 0); |
| 977 | unload_pixmap (f, face->stipple); |
| 978 | if (NILP (attr_value)) |
| 979 | new_pixmap = 0; |
| 980 | face->stipple = new_pixmap; |
| 981 | face->pixmap_w = w; |
| 982 | face->pixmap_h = h; |
| 983 | /* face->pixmap_depth = d; */ |
| 984 | } |
| 985 | #endif /* 0 */ |
| 986 | else if (EQ (attr_name, intern ("underline"))) |
| 987 | { |
| 988 | int new = !NILP (attr_value); |
| 989 | face->underline = new; |
| 990 | } |
| 991 | else |
| 992 | error ("unknown face attribute"); |
| 993 | |
| 994 | if (id == 0 || id == 1) |
| 995 | recompute_basic_faces (f); |
| 996 | |
| 997 | /* If we're modifying either of the frame's display faces, that |
| 998 | means that we're changing the parameters of a fixed face code; |
| 999 | since the color/font/whatever is changed but the face ID hasn't, |
| 1000 | redisplay won't know to redraw the affected sections. Give it a |
| 1001 | kick. */ |
| 1002 | if (id == 0 || id == 1) |
| 1003 | SET_FRAME_GARBAGED (f); |
| 1004 | else |
| 1005 | /* Otherwise, it's enough to tell it to redisplay the text. */ |
| 1006 | windows_or_buffers_changed = 1; |
| 1007 | |
| 1008 | return Qnil; |
| 1009 | } |
| 1010 | |
| 1011 | DEFUN ("internal-next-face-id", Finternal_next_face_id, Sinternal_next_face_id, |
| 1012 | 0, 0, 0, "") |
| 1013 | () |
| 1014 | { |
| 1015 | return make_number (next_face_id++); |
| 1016 | } |
| 1017 | |
| 1018 | /* Return the face id for name NAME on frame FRAME. |
| 1019 | (It should be the same for all frames, |
| 1020 | but it's as easy to use the "right" frame to look it up |
| 1021 | as to use any other one.) */ |
| 1022 | |
| 1023 | int |
| 1024 | face_name_id_number (f, name) |
| 1025 | FRAME_PTR f; |
| 1026 | Lisp_Object name; |
| 1027 | { |
| 1028 | Lisp_Object tem; |
| 1029 | |
| 1030 | tem = Fcdr (assq_no_quit (name, f->face_alist)); |
| 1031 | if (NILP (tem)) |
| 1032 | return 0; |
| 1033 | CHECK_VECTOR (tem, 0); |
| 1034 | tem = XVECTOR (tem)->contents[2]; |
| 1035 | CHECK_NUMBER (tem, 0); |
| 1036 | return XINT (tem); |
| 1037 | } |
| 1038 | \f |
| 1039 | /* Emacs initialization. */ |
| 1040 | |
| 1041 | void |
| 1042 | syms_of_xfaces () |
| 1043 | { |
| 1044 | Qface = intern ("face"); |
| 1045 | staticpro (&Qface); |
| 1046 | |
| 1047 | DEFVAR_INT ("region-face", ®ion_face, |
| 1048 | "Face number to use to highlight the region\n\ |
| 1049 | The region is highlighted with this face\n\ |
| 1050 | when Transient Mark mode is enabled and the mark is active."); |
| 1051 | |
| 1052 | defsubr (&Sframe_face_alist); |
| 1053 | defsubr (&Sset_frame_face_alist); |
| 1054 | defsubr (&Smake_face_internal); |
| 1055 | defsubr (&Sset_face_attribute_internal); |
| 1056 | defsubr (&Sinternal_next_face_id); |
| 1057 | } |
| 1058 | |
| 1059 | #endif /* HAVE_X_WINDOWS */ |
| 1060 | |