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date Mon, 13 Aug 2007 11:28:15 +0200
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1 /* X-specific Lisp objects.
2 Copyright (C) 1993, 1994 Free Software Foundation, Inc.
3 Copyright (C) 1995 Board of Trustees, University of Illinois.
4 Copyright (C) 1995 Tinker Systems.
5 Copyright (C) 1995, 1996 Ben Wing.
6 Copyright (C) 1995 Sun Microsystems, Inc.
7
8 This file is part of XEmacs.
9
10 XEmacs is free software; you can redistribute it and/or modify it
11 under the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option) any
13 later version.
14
15 XEmacs is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with XEmacs; see the file COPYING. If not, write to
22 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
24
25 /* Synched up with: Not in FSF. */
26
27 /* Authors: Jamie Zawinski, Chuck Thompson, Ben Wing */
28
29 #include <config.h>
30 #include "lisp.h"
31 #include <limits.h>
32
33 #include "console-x.h"
34 #include "objects-x.h"
35
36 #include "buffer.h"
37 #include "device.h"
38 #include "insdel.h"
39
40 int x_handle_non_fully_specified_fonts;
41
42
43 /************************************************************************/
44 /* color instances */
45 /************************************************************************/
46
47 /* Replacement for XAllocColor() that tries to return the nearest
48 available color if the colormap is full. Original was from FSFmacs,
49 but rewritten by Jareth Hein <jareth@camelot-soft.com> 97/11/25
50 Modified by Lee Kindness <lkindness@csl.co.uk> 31/08/99 to handle previous
51 total failure which was due to a read/write colorcell being the nearest
52 match - tries the next nearest...
53
54 Return value is 1 for normal success, 2 for nearest color success,
55 3 for Non-deallocable sucess. */
56 int
57 allocate_nearest_color (Display *display, Colormap colormap, Visual *visual,
58 XColor *color_def)
59 {
60 int status;
61
62 if (visual->class == DirectColor || visual->class == TrueColor)
63 {
64 if (XAllocColor (display, colormap, color_def) != 0)
65 {
66 status = 1;
67 }
68 else
69 {
70 /* We're dealing with a TrueColor/DirectColor visual, so play games
71 with the RGB values in the XColor struct. */
72 /* ### JH: I'm not sure how a call to XAllocColor can fail in a
73 TrueColor or DirectColor visual, so I will just reformat the
74 request to match the requirements of the visual, and re-issue
75 the request. If this fails for anybody, I wanna know about it
76 so I can come up with a better plan */
77
78 unsigned long rshift,gshift,bshift,rbits,gbits,bbits,junk;
79 junk = visual->red_mask;
80 rshift = 0;
81 while ((junk & 0x1) == 0) {
82 junk = junk >> 1;
83 rshift ++;
84 }
85 rbits = 0;
86 while (junk != 0) {
87 junk = junk >> 1;
88 rbits++;
89 }
90 junk = visual->green_mask;
91 gshift = 0;
92 while ((junk & 0x1) == 0) {
93 junk = junk >> 1;
94 gshift ++;
95 }
96 gbits = 0;
97 while (junk != 0) {
98 junk = junk >> 1;
99 gbits++;
100 }
101 junk = visual->blue_mask;
102 bshift = 0;
103 while ((junk & 0x1) == 0) {
104 junk = junk >> 1;
105 bshift ++;
106 }
107 bbits = 0;
108 while (junk != 0) {
109 junk = junk >> 1;
110 bbits++;
111 }
112
113 color_def->red = color_def->red >> (16 - rbits);
114 color_def->green = color_def->green >> (16 - gbits);
115 color_def->blue = color_def->blue >> (16 - bbits);
116 if (XAllocColor (display, colormap, color_def) != 0)
117 status = 1;
118 else
119 {
120 int rd, gr, bl;
121 /* ### JH: I'm punting here, knowing that doing this will at
122 least draw the color correctly. However, unless we convert
123 all of the functions that allocate colors (graphics
124 libraries, etc) to use this function doing this is very
125 likely to cause problems later... */
126
127 if (rbits > 8)
128 rd = color_def->red << (rbits - 8);
129 else
130 rd = color_def->red >> (8 - rbits);
131 if (gbits > 8)
132 gr = color_def->green << (gbits - 8);
133 else
134 gr = color_def->green >> (8 - gbits);
135 if (bbits > 8)
136 bl = color_def->blue << (bbits - 8);
137 else
138 bl = color_def->blue >> (8 - bbits);
139 color_def->pixel = (rd << rshift) | (gr << gshift) | (bl << bshift);
140 status = 3;
141 }
142 }
143 }
144 else
145 {
146 XColor *cells = NULL;
147 /* JH: I can't believe there's no way to go backwards from a
148 colormap ID and get its visual and number of entries, but X
149 apparently isn't built that way... */
150 int no_cells = visual->map_entries;
151 status = 0;
152
153 if (XAllocColor (display, colormap, color_def) != 0)
154 status = 1;
155 else while( status != 2 )
156 {
157 /* If we got to this point, the colormap is full, so we're
158 going to try and get the next closest color. The algorithm used
159 is a least-squares matching, which is what X uses for closest
160 color matching with StaticColor visuals. */
161 int nearest;
162 long nearest_delta, trial_delta;
163 int x;
164
165 if( cells == NULL )
166 {
167 cells = alloca_array (XColor, no_cells);
168 for (x = 0; x < no_cells; x++)
169 cells[x].pixel = x;
170
171 /* read the current colormap */
172 XQueryColors (display, colormap, cells, no_cells);
173 }
174
175 nearest = 0;
176 /* I'm assuming CSE so I'm not going to condense this. */
177 nearest_delta = ((((color_def->red >> 8) - (cells[0].red >> 8))
178 * ((color_def->red >> 8) - (cells[0].red >> 8)))
179 +
180 (((color_def->green >> 8) - (cells[0].green >> 8))
181 * ((color_def->green >> 8) - (cells[0].green >> 8)))
182 +
183 (((color_def->blue >> 8) - (cells[0].blue >> 8))
184 * ((color_def->blue >> 8) - (cells[0].blue >> 8))));
185 for (x = 1; x < no_cells; x++)
186 {
187 trial_delta = ((((color_def->red >> 8) - (cells[x].red >> 8))
188 * ((color_def->red >> 8) - (cells[x].red >> 8)))
189 +
190 (((color_def->green >> 8) - (cells[x].green >> 8))
191 * ((color_def->green >> 8) - (cells[x].green >> 8)))
192 +
193 (((color_def->blue >> 8) - (cells[x].blue >> 8))
194 * ((color_def->blue >> 8) - (cells[x].blue >> 8))));
195
196 /* less? Ignore cells marked as previously failing */
197 if( (trial_delta < nearest_delta) &&
198 (cells[x].pixel != ULONG_MAX) )
199 {
200 nearest = x;
201 nearest_delta = trial_delta;
202 }
203 }
204 color_def->red = cells[nearest].red;
205 color_def->green = cells[nearest].green;
206 color_def->blue = cells[nearest].blue;
207 if (XAllocColor (display, colormap, color_def) != 0)
208 status = 2;
209 else
210 /* LSK: Either the colour map has changed since
211 * we read it, or the colour is allocated
212 * read/write... Mark this cmap entry so it's
213 * ignored in the next iteration.
214 */
215 cells[nearest].pixel = ULONG_MAX;
216 }
217 }
218 return status;
219 }
220
221 int
222 x_parse_nearest_color (struct device *d, XColor *color, Bufbyte *name,
223 Bytecount len, Error_behavior errb)
224 {
225 Display *dpy = DEVICE_X_DISPLAY (d);
226 Colormap cmap = DEVICE_X_COLORMAP (d);
227 Visual *visual = DEVICE_X_VISUAL (d);
228 int result;
229
230 xzero (*color);
231 {
232 CONST Extbyte *extname;
233 Extcount extnamelen;
234
235 GET_CHARPTR_EXT_BINARY_DATA_ALLOCA (name, len, extname, extnamelen);
236 result = XParseColor (dpy, cmap, (char *) extname, color);
237 }
238 if (!result)
239 {
240 maybe_signal_simple_error ("Unrecognized color", make_string (name, len),
241 Qcolor, errb);
242 return 0;
243 }
244 result = allocate_nearest_color (dpy, cmap, visual, color);
245 if (!result)
246 {
247 maybe_signal_simple_error ("Couldn't allocate color",
248 make_string (name, len), Qcolor, errb);
249 return 0;
250 }
251
252 return result;
253 }
254
255 static int
256 x_initialize_color_instance (struct Lisp_Color_Instance *c, Lisp_Object name,
257 Lisp_Object device, Error_behavior errb)
258 {
259 XColor color;
260 int result;
261
262 result = x_parse_nearest_color (XDEVICE (device), &color,
263 XSTRING_DATA (name),
264 XSTRING_LENGTH (name),
265 errb);
266
267 if (!result)
268 return 0;
269
270 /* Don't allocate the data until we're sure that we will succeed,
271 or the finalize method may get fucked. */
272 c->data = xnew (struct x_color_instance_data);
273 if (result == 3)
274 COLOR_INSTANCE_X_DEALLOC (c) = 0;
275 else
276 COLOR_INSTANCE_X_DEALLOC (c) = 1;
277 COLOR_INSTANCE_X_COLOR (c) = color;
278 return 1;
279 }
280
281 static void
282 x_print_color_instance (struct Lisp_Color_Instance *c,
283 Lisp_Object printcharfun,
284 int escapeflag)
285 {
286 char buf[100];
287 XColor color = COLOR_INSTANCE_X_COLOR (c);
288 sprintf (buf, " %ld=(%X,%X,%X)",
289 color.pixel, color.red, color.green, color.blue);
290 write_c_string (buf, printcharfun);
291 }
292
293 static void
294 x_finalize_color_instance (struct Lisp_Color_Instance *c)
295 {
296 if (c->data)
297 {
298 if (DEVICE_LIVE_P (XDEVICE (c->device)))
299 {
300 if (COLOR_INSTANCE_X_DEALLOC (c))
301 {
302 XFreeColors (DEVICE_X_DISPLAY (XDEVICE (c->device)), DEVICE_X_COLORMAP (XDEVICE (c->device)),
303 &COLOR_INSTANCE_X_COLOR (c).pixel, 1, 0);
304 }
305 }
306 xfree (c->data);
307 c->data = 0;
308 }
309 }
310
311 /* Color instances are equal if they resolve to the same color on the
312 screen (have the same RGB values). I imagine that
313 "same RGB values" == "same cell in the colormap." Arguably we should
314 be comparing their names or pixel values instead. */
315
316 static int
317 x_color_instance_equal (struct Lisp_Color_Instance *c1,
318 struct Lisp_Color_Instance *c2,
319 int depth)
320 {
321 XColor color1 = COLOR_INSTANCE_X_COLOR (c1);
322 XColor color2 = COLOR_INSTANCE_X_COLOR (c2);
323 return ((color1.red == color2.red) &&
324 (color1.green == color2.green) &&
325 (color1.blue == color2.blue));
326 }
327
328 static unsigned long
329 x_color_instance_hash (struct Lisp_Color_Instance *c, int depth)
330 {
331 XColor color = COLOR_INSTANCE_X_COLOR (c);
332 return HASH3 (color.red, color.green, color.blue);
333 }
334
335 static Lisp_Object
336 x_color_instance_rgb_components (struct Lisp_Color_Instance *c)
337 {
338 XColor color = COLOR_INSTANCE_X_COLOR (c);
339 return (list3 (make_int (color.red),
340 make_int (color.green),
341 make_int (color.blue)));
342 }
343
344 static int
345 x_valid_color_name_p (struct device *d, Lisp_Object color)
346 {
347 XColor c;
348 Display *dpy = DEVICE_X_DISPLAY (d);
349 Colormap cmap = DEVICE_X_COLORMAP (d);
350
351 CONST char *extname;
352
353 GET_C_STRING_CTEXT_DATA_ALLOCA (color, extname);
354
355 return XParseColor (dpy, cmap,
356 extname, &c);
357 }
358
359
360 /************************************************************************/
361 /* font instances */
362 /************************************************************************/
363
364 static int
365 x_initialize_font_instance (struct Lisp_Font_Instance *f, Lisp_Object name,
366 Lisp_Object device, Error_behavior errb)
367 {
368 Display *dpy;
369 XFontStruct *xf;
370 CONST char *extname;
371
372 dpy = DEVICE_X_DISPLAY (XDEVICE (device));
373 GET_C_STRING_CTEXT_DATA_ALLOCA (f->name, extname);
374 xf = XLoadQueryFont (dpy, extname);
375
376 if (!xf)
377 {
378 maybe_signal_simple_error ("Couldn't load font", f->name,
379 Qfont, errb);
380 return 0;
381 }
382
383 if (!xf->max_bounds.width)
384 {
385 /* yes, this has been known to happen. */
386 XFreeFont (dpy, xf);
387 maybe_signal_simple_error ("X font is too small", f->name,
388 Qfont, errb);
389 return 0;
390 }
391
392 /* Don't allocate the data until we're sure that we will succeed,
393 or the finalize method may get fucked. */
394 f->data = xnew (struct x_font_instance_data);
395 FONT_INSTANCE_X_TRUENAME (f) = Qnil;
396 FONT_INSTANCE_X_FONT (f) = xf;
397 f->ascent = xf->ascent;
398 f->descent = xf->descent;
399 f->height = xf->ascent + xf->descent;
400 {
401 /* following change suggested by Ted Phelps <phelps@dstc.edu.au> */
402 unsigned int def_char = 'n'; /*xf->default_char;*/
403 unsigned int byte1, byte2;
404
405 once_more:
406 byte1 = def_char >> 8;
407 byte2 = def_char & 0xFF;
408
409 if (xf->per_char)
410 {
411 /* Old versions of the R5 font server have garbage (>63k) as
412 def_char. 'n' might not be a valid character. */
413 if (byte1 < xf->min_byte1 ||
414 byte1 > xf->max_byte1 ||
415 byte2 < xf->min_char_or_byte2 ||
416 byte2 > xf->max_char_or_byte2)
417 f->width = 0;
418 else
419 f->width = xf->per_char[(byte1 - xf->min_byte1) *
420 (xf->max_char_or_byte2 -
421 xf->min_char_or_byte2 + 1) +
422 (byte2 - xf->min_char_or_byte2)].width;
423 }
424 else
425 f->width = xf->max_bounds.width;
426
427 /* Some fonts have a default char whose width is 0. This is no good.
428 If that's the case, first try 'n' as the default char, and if n has
429 0 width too (unlikely) then just use the max width. */
430 if (f->width == 0)
431 {
432 if (def_char == xf->default_char)
433 f->width = xf->max_bounds.width;
434 else
435 {
436 def_char = xf->default_char;
437 goto once_more;
438 }
439 }
440 }
441 /* If all characters don't exist then there could potentially be
442 0-width characters lurking out there. Not setting this flag
443 trips an optimization that would make them appear to have width
444 to redisplay. This is bad. So we set it if not all characters
445 have the same width or if not all characters are defined.
446 */
447 /* #### This sucks. There is a measurable performance increase
448 when using proportional width fonts if this flag is not set.
449 Unfortunately so many of the fucking X fonts are not fully
450 defined that we could almost just get rid of this damn flag and
451 make it an assertion. */
452 f->proportional_p = (xf->min_bounds.width != xf->max_bounds.width ||
453 (x_handle_non_fully_specified_fonts &&
454 !xf->all_chars_exist));
455
456 return 1;
457 }
458
459 static void
460 x_mark_font_instance (struct Lisp_Font_Instance *f)
461 {
462 mark_object (FONT_INSTANCE_X_TRUENAME (f));
463 }
464
465 static void
466 x_print_font_instance (struct Lisp_Font_Instance *f,
467 Lisp_Object printcharfun,
468 int escapeflag)
469 {
470 char buf[200];
471 sprintf (buf, " 0x%lx", (unsigned long) FONT_INSTANCE_X_FONT (f)->fid);
472 write_c_string (buf, printcharfun);
473 }
474
475 static void
476 x_finalize_font_instance (struct Lisp_Font_Instance *f)
477 {
478
479 if (f->data)
480 {
481 if (DEVICE_LIVE_P (XDEVICE (f->device)))
482 {
483 Display *dpy = DEVICE_X_DISPLAY (XDEVICE (f->device));
484
485 XFreeFont (dpy, FONT_INSTANCE_X_FONT (f));
486 }
487 xfree (f->data);
488 f->data = 0;
489 }
490 }
491
492 /* Determining the truename of a font is hard. (Big surprise.)
493
494 By "truename" we mean an XLFD-form name which contains no wildcards, yet
495 which resolves to *exactly* the same font as the one which we already have
496 the (probably wildcarded) name and `XFontStruct' of.
497
498 One might think that the first font returned by XListFonts would be the one
499 that XOpenFont would pick. Apparently this is the case on some servers,
500 but not on others. It would seem not to be specified.
501
502 The MIT R5 server sometimes appears to be picking the lexicographically
503 smallest font which matches the name (thus picking "adobe" fonts before
504 "bitstream" fonts even if the bitstream fonts are earlier in the path, and
505 also picking 100dpi adobe fonts over 75dpi adobe fonts even though the
506 75dpi are in the path earlier) but sometimes appears to be doing something
507 else entirely (for example, removing the bitsream fonts from the path will
508 cause the 75dpi adobe fonts to be used instead of the 100dpi, even though
509 their relative positions in the path (and their names!) have not changed).
510
511 The documentation for XSetFontPath() seems to indicate that the order of
512 entries in the font path means something, but it's pretty noncommital about
513 it, and the spirit of the law is apparently not being obeyed...
514
515 All the fonts I've seen have a property named `FONT' which contains the
516 truename of the font. However, there are two problems with using this: the
517 first is that the X Protocol Document is quite explicit that all properties
518 are optional, so we can't depend on it being there. The second is that
519 it's conceivable that this alleged truename isn't actually accessible as a
520 font, due to some difference of opinion between the font designers and
521 whoever installed the font on the system.
522
523 So, our first attempt is to look for a FONT property, and then verify that
524 the name there is a valid name by running XListFonts on it. There's still
525 the potential that this could be true but we could still be being lied to,
526 but that seems pretty remote.
527
528 Late breaking news: I've gotten reports that SunOS 4.1.3U1
529 with OpenWound 3.0 has a font whose truename is really
530 "-Adobe-Courier-Medium-R-Normal--12-120-75-75-M-70-ISO8859-1"
531 but whose FONT property contains "Courier".
532
533 So we disbelieve the FONT property unless it begins with a dash and
534 is more than 30 characters long. X Windows: The defacto substandard.
535 X Windows: Complex nonsolutions to simple nonproblems. X Windows:
536 Live the nightmare.
537
538 If the FONT property doesn't exist, then we try and construct an XLFD name
539 out of the other font properties (FOUNDRY, FAMILY_NAME, WEIGHT_NAME, etc).
540 This is necessary at least for some versions of OpenWound. But who knows
541 what the future will bring.
542
543 If that doesn't work, then we use XListFonts and either take the first font
544 (which I think is the most sensible thing) or we find the lexicographically
545 least, depending on whether the preprocessor constant `XOPENFONT_SORTS' is
546 defined. This sucks because the two behaviors are a property of the server
547 being used, not the architecture on which emacs has been compiled. Also,
548 as I described above, sorting isn't ALWAYS what the server does. Really it
549 does something seemingly random. There is no reliable way to win if the
550 FONT property isn't present.
551
552 Another possibility which I haven't bothered to implement would be to map
553 over all of the matching fonts and find the first one that has the same
554 character metrics as the font we already have loaded. Even if this didn't
555 return exactly the same font, it would at least return one whose characters
556 were the same sizes, which would probably be good enough.
557
558 More late-breaking news: on RS/6000 AIX 3.2.4, the expression
559 XLoadQueryFont (dpy, "-*-Fixed-Medium-R-*-*-*-130-75-75-*-*-ISO8859-1")
560 actually returns the font
561 -Misc-Fixed-Medium-R-Normal--13-120-75-75-C-80-ISO8859-1
562 which is crazy, because that font doesn't even match that pattern! It is
563 also not included in the output produced by `xlsfonts' with that pattern.
564
565 So this is yet another example of XListFonts() and XOpenFont() using
566 completely different algorithms. This, however, is a goofier example of
567 this bug, because in this case, it's not just the search order that is
568 different -- the sets don't even intersect.
569
570 If anyone has any better ideas how to do this, or any insights on what it is
571 that the various servers are actually doing, please let me know! -- jwz. */
572
573 static int
574 valid_x_font_name_p (Display *dpy, char *name)
575 {
576 /* Maybe this should be implemented by calling XLoadFont and trapping
577 the error. That would be a lot of work, and wasteful as hell, but
578 might be more correct.
579 */
580 int nnames = 0;
581 char **names = 0;
582 if (! name)
583 return 0;
584 names = XListFonts (dpy, name, 1, &nnames);
585 if (names)
586 XFreeFontNames (names);
587 return (nnames != 0);
588 }
589
590 static char *
591 truename_via_FONT_prop (Display *dpy, XFontStruct *font)
592 {
593 unsigned long value = 0;
594 char *result = 0;
595 if (XGetFontProperty (font, XA_FONT, &value))
596 result = XGetAtomName (dpy, value);
597 /* result is now 0, or the string value of the FONT property. */
598 if (result)
599 {
600 /* Verify that result is an XLFD name (roughly...) */
601 if (result [0] != '-' || strlen (result) < (unsigned int) 30)
602 {
603 XFree (result);
604 result = 0;
605 }
606 }
607 return result; /* this must be freed by caller if non-0 */
608 }
609
610 static char *
611 truename_via_random_props (Display *dpy, XFontStruct *font)
612 {
613 struct device *d = get_device_from_display (dpy);
614 unsigned long value = 0;
615 char *foundry, *family, *weight, *slant, *setwidth, *add_style;
616 unsigned long pixel, point, res_x, res_y;
617 char *spacing;
618 unsigned long avg_width;
619 char *registry, *encoding;
620 char composed_name [2048];
621 int ok = 0;
622 char *result;
623
624 #define get_string(atom,var) \
625 if (XGetFontProperty (font, (atom), &value)) \
626 var = XGetAtomName (dpy, value); \
627 else { \
628 var = 0; \
629 goto FAIL; }
630 #define get_number(atom,var) \
631 if (!XGetFontProperty (font, (atom), &var) || \
632 var > 999) \
633 goto FAIL;
634
635 foundry = family = weight = slant = setwidth = 0;
636 add_style = spacing = registry = encoding = 0;
637
638 get_string (DEVICE_XATOM_FOUNDRY (d), foundry);
639 get_string (DEVICE_XATOM_FAMILY_NAME (d), family);
640 get_string (DEVICE_XATOM_WEIGHT_NAME (d), weight);
641 get_string (DEVICE_XATOM_SLANT (d), slant);
642 get_string (DEVICE_XATOM_SETWIDTH_NAME (d), setwidth);
643 get_string (DEVICE_XATOM_ADD_STYLE_NAME (d), add_style);
644 get_number (DEVICE_XATOM_PIXEL_SIZE (d), pixel);
645 get_number (DEVICE_XATOM_POINT_SIZE (d), point);
646 get_number (DEVICE_XATOM_RESOLUTION_X (d), res_x);
647 get_number (DEVICE_XATOM_RESOLUTION_Y (d), res_y);
648 get_string (DEVICE_XATOM_SPACING (d), spacing);
649 get_number (DEVICE_XATOM_AVERAGE_WIDTH (d), avg_width);
650 get_string (DEVICE_XATOM_CHARSET_REGISTRY (d), registry);
651 get_string (DEVICE_XATOM_CHARSET_ENCODING (d), encoding);
652 #undef get_number
653 #undef get_string
654
655 sprintf (composed_name,
656 "-%s-%s-%s-%s-%s-%s-%ld-%ld-%ld-%ld-%s-%ld-%s-%s",
657 foundry, family, weight, slant, setwidth, add_style, pixel,
658 point, res_x, res_y, spacing, avg_width, registry, encoding);
659 ok = 1;
660
661 FAIL:
662 if (ok)
663 {
664 int L = strlen (composed_name) + 1;
665 result = (char *) xmalloc (L);
666 strncpy (result, composed_name, L);
667 }
668 else
669 result = 0;
670
671 if (foundry) XFree (foundry);
672 if (family) XFree (family);
673 if (weight) XFree (weight);
674 if (slant) XFree (slant);
675 if (setwidth) XFree (setwidth);
676 if (add_style) XFree (add_style);
677 if (spacing) XFree (spacing);
678 if (registry) XFree (registry);
679 if (encoding) XFree (encoding);
680
681 return result;
682 }
683
684 /* Unbounded, for sufficiently small values of infinity... */
685 #define MAX_FONT_COUNT 5000
686
687 static char *
688 truename_via_XListFonts (Display *dpy, char *font_name)
689 {
690 char *result = 0;
691 char **names;
692 int count = 0;
693
694 #ifndef XOPENFONT_SORTS
695 /* In a sensible world, the first font returned by XListFonts()
696 would be the font that XOpenFont() would use. */
697 names = XListFonts (dpy, font_name, 1, &count);
698 if (count) result = names [0];
699 #else
700 /* But the world I live in is much more perverse. */
701 names = XListFonts (dpy, font_name, MAX_FONT_COUNT, &count);
702 while (count--)
703 /* If names[count] is lexicographically less than result, use it.
704 (#### Should we be comparing case-insensitively?) */
705 if (result == 0 || (strcmp (result, names [count]) < 0))
706 result = names [count];
707 #endif
708
709 if (result)
710 result = xstrdup (result);
711 if (names)
712 XFreeFontNames (names);
713
714 return result; /* this must be freed by caller if non-0 */
715 }
716
717 static Lisp_Object
718 x_font_truename (Display *dpy, char *name, XFontStruct *font)
719 {
720 char *truename_FONT = 0;
721 char *truename_random = 0;
722 char *truename = 0;
723
724 /* The search order is:
725 - if FONT property exists, and is a valid name, return it.
726 - if the other props exist, and add up to a valid name, return it.
727 - if we find a matching name with XListFonts, return it.
728 - if FONT property exists, return it regardless.
729 - if other props exist, return the resultant name regardless.
730 - else return 0.
731 */
732
733 truename = truename_FONT = truename_via_FONT_prop (dpy, font);
734 if (truename && !valid_x_font_name_p (dpy, truename))
735 truename = 0;
736 if (!truename)
737 truename = truename_random = truename_via_random_props (dpy, font);
738 if (truename && !valid_x_font_name_p (dpy, truename))
739 truename = 0;
740 if (!truename && name)
741 truename = truename_via_XListFonts (dpy, name);
742
743 if (!truename)
744 {
745 /* Gag - we weren't able to find a seemingly-valid truename.
746 Well, maybe we're on one of those braindead systems where
747 XListFonts() and XLoadFont() are in violent disagreement.
748 If we were able to compute a truename, try using that even
749 if evidence suggests that it's not a valid name - because
750 maybe it is, really, and that's better than nothing.
751 X Windows: You'll envy the dead.
752 */
753 if (truename_FONT)
754 truename = truename_FONT;
755 else if (truename_random)
756 truename = truename_random;
757 }
758
759 /* One or both of these are not being used - free them. */
760 if (truename_FONT && truename_FONT != truename)
761 XFree (truename_FONT);
762 if (truename_random && truename_random != truename)
763 XFree (truename_random);
764
765 if (truename)
766 {
767 Lisp_Object result = build_string (truename);
768 XFree (truename);
769 return result;
770 }
771 else
772 return Qnil;
773 }
774
775 static Lisp_Object
776 x_font_instance_truename (struct Lisp_Font_Instance *f, Error_behavior errb)
777 {
778 struct device *d = XDEVICE (f->device);
779
780 if (NILP (FONT_INSTANCE_X_TRUENAME (f)))
781 {
782 Display *dpy = DEVICE_X_DISPLAY (d);
783 char *name = (char *) XSTRING_DATA (f->name);
784 {
785 FONT_INSTANCE_X_TRUENAME (f) =
786 x_font_truename (dpy, name, FONT_INSTANCE_X_FONT (f));
787 }
788 if (NILP (FONT_INSTANCE_X_TRUENAME (f)))
789 {
790 Lisp_Object font_instance;
791 XSETFONT_INSTANCE (font_instance, f);
792
793 maybe_signal_simple_error ("Couldn't determine font truename",
794 font_instance, Qfont, errb);
795 /* Ok, just this once, return the font name as the truename.
796 (This is only used by Fequal() right now.) */
797 return f->name;
798 }
799 }
800 return (FONT_INSTANCE_X_TRUENAME (f));
801 }
802
803 static Lisp_Object
804 x_font_instance_properties (struct Lisp_Font_Instance *f)
805 {
806 struct device *d = XDEVICE (f->device);
807 int i;
808 Lisp_Object result = Qnil;
809 XFontProp *props;
810 Display *dpy;
811
812 dpy = DEVICE_X_DISPLAY (d);
813 props = FONT_INSTANCE_X_FONT (f)->properties;
814 for (i = FONT_INSTANCE_X_FONT (f)->n_properties - 1; i >= 0; i--)
815 {
816 char *name_str = 0;
817 char *val_str = 0;
818 Lisp_Object name, value;
819 Atom atom = props [i].name;
820 name_str = XGetAtomName (dpy, atom);
821 name = (name_str ? intern (name_str) : Qnil);
822 if (name_str &&
823 (atom == XA_FONT ||
824 atom == DEVICE_XATOM_FOUNDRY (d) ||
825 atom == DEVICE_XATOM_FAMILY_NAME (d) ||
826 atom == DEVICE_XATOM_WEIGHT_NAME (d) ||
827 atom == DEVICE_XATOM_SLANT (d) ||
828 atom == DEVICE_XATOM_SETWIDTH_NAME (d) ||
829 atom == DEVICE_XATOM_ADD_STYLE_NAME (d) ||
830 atom == DEVICE_XATOM_SPACING (d) ||
831 atom == DEVICE_XATOM_CHARSET_REGISTRY (d) ||
832 atom == DEVICE_XATOM_CHARSET_ENCODING (d) ||
833 !strcmp (name_str, "CHARSET_COLLECTIONS") ||
834 !strcmp (name_str, "FONTNAME_REGISTRY") ||
835 !strcmp (name_str, "CLASSIFICATION") ||
836 !strcmp (name_str, "COPYRIGHT") ||
837 !strcmp (name_str, "DEVICE_FONT_NAME") ||
838 !strcmp (name_str, "FULL_NAME") ||
839 !strcmp (name_str, "MONOSPACED") ||
840 !strcmp (name_str, "QUALITY") ||
841 !strcmp (name_str, "RELATIVE_SET") ||
842 !strcmp (name_str, "RELATIVE_WEIGHT") ||
843 !strcmp (name_str, "STYLE")))
844 {
845 val_str = XGetAtomName (dpy, props [i].card32);
846 value = (val_str ? build_string (val_str) : Qnil);
847 }
848 else
849 value = make_int (props [i].card32);
850 if (name_str) XFree (name_str);
851 result = Fcons (Fcons (name, value), result);
852 }
853 return result;
854 }
855
856 static Lisp_Object
857 x_list_fonts (Lisp_Object pattern, Lisp_Object device)
858 {
859 char **names;
860 int count = 0;
861 Lisp_Object result = Qnil;
862 CONST char *patternext;
863
864 GET_C_STRING_BINARY_DATA_ALLOCA (pattern, patternext);
865
866 names = XListFonts (DEVICE_X_DISPLAY (XDEVICE (device)),
867 patternext, MAX_FONT_COUNT, &count);
868 while (count--)
869 result = Fcons (build_ext_string (names [count], FORMAT_BINARY), result);
870 if (names)
871 XFreeFontNames (names);
872 return result;
873 }
874
875 #ifdef MULE
876
877 static int
878 x_font_spec_matches_charset (struct device *d, Lisp_Object charset,
879 CONST Bufbyte *nonreloc, Lisp_Object reloc,
880 Bytecount offset, Bytecount length)
881 {
882 if (UNBOUNDP (charset))
883 return 1;
884 /* Hack! Short font names don't have the registry in them,
885 so we just assume the user knows what they're doing in the
886 case of ASCII. For other charsets, you gotta give the
887 long form; sorry buster.
888 */
889 if (EQ (charset, Vcharset_ascii))
890 {
891 CONST Bufbyte *the_nonreloc = nonreloc;
892 int i;
893 Bytecount the_length = length;
894
895 if (!the_nonreloc)
896 the_nonreloc = XSTRING_DATA (reloc);
897 fixup_internal_substring (nonreloc, reloc, offset, &the_length);
898 the_nonreloc += offset;
899 if (!memchr (the_nonreloc, '*', the_length))
900 {
901 for (i = 0;; i++)
902 {
903 CONST Bufbyte *new_nonreloc = (CONST Bufbyte *)
904 memchr (the_nonreloc, '-', the_length);
905 if (!new_nonreloc)
906 break;
907 new_nonreloc++;
908 the_length -= new_nonreloc - the_nonreloc;
909 the_nonreloc = new_nonreloc;
910 }
911
912 /* If it has less than 5 dashes, it's a short font.
913 Of course, long fonts always have 14 dashes or so, but short
914 fonts never have more than 1 or 2 dashes, so this is some
915 sort of reasonable heuristic. */
916 if (i < 5)
917 return 1;
918 }
919 }
920
921 return (fast_string_match (XCHARSET_REGISTRY (charset),
922 nonreloc, reloc, offset, length, 1,
923 ERROR_ME, 0) >= 0);
924 }
925
926 /* find a font spec that matches font spec FONT and also matches
927 (the registry of) CHARSET. */
928 static Lisp_Object
929 x_find_charset_font (Lisp_Object device, Lisp_Object font, Lisp_Object charset)
930 {
931 char **names;
932 int count = 0;
933 Lisp_Object result = Qnil;
934 CONST char *patternext;
935 int i;
936
937 GET_C_STRING_BINARY_DATA_ALLOCA (font, patternext);
938
939 names = XListFonts (DEVICE_X_DISPLAY (XDEVICE (device)),
940 patternext, MAX_FONT_COUNT, &count);
941 /* ### This code seems awfully bogus -- mrb */
942 for (i = 0; i < count; i ++)
943 {
944 CONST Bufbyte *intname;
945
946 GET_C_CHARPTR_INT_BINARY_DATA_ALLOCA (names[i], intname);
947 if (x_font_spec_matches_charset (XDEVICE (device), charset,
948 intname, Qnil, 0, -1))
949 {
950 result = build_string ((char *) intname);
951 break;
952 }
953 }
954
955 if (names)
956 XFreeFontNames (names);
957
958 /* Check for a short font name. */
959 if (NILP (result)
960 && x_font_spec_matches_charset (XDEVICE (device), charset, 0,
961 font, 0, -1))
962 return font;
963
964 return result;
965 }
966
967 #endif /* MULE */
968
969
970 /************************************************************************/
971 /* initialization */
972 /************************************************************************/
973
974 void
975 syms_of_objects_x (void)
976 {
977 }
978
979 void
980 console_type_create_objects_x (void)
981 {
982 /* object methods */
983
984 CONSOLE_HAS_METHOD (x, initialize_color_instance);
985 CONSOLE_HAS_METHOD (x, print_color_instance);
986 CONSOLE_HAS_METHOD (x, finalize_color_instance);
987 CONSOLE_HAS_METHOD (x, color_instance_equal);
988 CONSOLE_HAS_METHOD (x, color_instance_hash);
989 CONSOLE_HAS_METHOD (x, color_instance_rgb_components);
990 CONSOLE_HAS_METHOD (x, valid_color_name_p);
991
992 CONSOLE_HAS_METHOD (x, initialize_font_instance);
993 CONSOLE_HAS_METHOD (x, mark_font_instance);
994 CONSOLE_HAS_METHOD (x, print_font_instance);
995 CONSOLE_HAS_METHOD (x, finalize_font_instance);
996 CONSOLE_HAS_METHOD (x, font_instance_truename);
997 CONSOLE_HAS_METHOD (x, font_instance_properties);
998 CONSOLE_HAS_METHOD (x, list_fonts);
999 #ifdef MULE
1000 CONSOLE_HAS_METHOD (x, find_charset_font);
1001 CONSOLE_HAS_METHOD (x, font_spec_matches_charset);
1002 #endif
1003 }
1004
1005 void
1006 vars_of_objects_x (void)
1007 {
1008 DEFVAR_BOOL ("x-handle-non-fully-specified-fonts",
1009 &x_handle_non_fully_specified_fonts /*
1010 If this is true then fonts which do not have all characters specified
1011 will be considered to be proportional width even if they are actually
1012 fixed-width. If this is not done then characters which are supposed to
1013 have 0 width may appear to actually have some width.
1014
1015 Note: While setting this to t guarantees correct output in all
1016 circumstances, it also causes a noticeable performance hit when using
1017 fixed-width fonts. Since most people don't use characters which could
1018 cause problems this is set to nil by default.
1019 */ );
1020 x_handle_non_fully_specified_fonts = 0;
1021 }
1022
1023 void
1024 Xatoms_of_objects_x (struct device *d)
1025 {
1026 Display *D = DEVICE_X_DISPLAY (d);
1027
1028 DEVICE_XATOM_FOUNDRY (d) = XInternAtom (D, "FOUNDRY", False);
1029 DEVICE_XATOM_FAMILY_NAME (d) = XInternAtom (D, "FAMILY_NAME", False);
1030 DEVICE_XATOM_WEIGHT_NAME (d) = XInternAtom (D, "WEIGHT_NAME", False);
1031 DEVICE_XATOM_SLANT (d) = XInternAtom (D, "SLANT", False);
1032 DEVICE_XATOM_SETWIDTH_NAME (d) = XInternAtom (D, "SETWIDTH_NAME", False);
1033 DEVICE_XATOM_ADD_STYLE_NAME (d) = XInternAtom (D, "ADD_STYLE_NAME", False);
1034 DEVICE_XATOM_PIXEL_SIZE (d) = XInternAtom (D, "PIXEL_SIZE", False);
1035 DEVICE_XATOM_POINT_SIZE (d) = XInternAtom (D, "POINT_SIZE", False);
1036 DEVICE_XATOM_RESOLUTION_X (d) = XInternAtom (D, "RESOLUTION_X", False);
1037 DEVICE_XATOM_RESOLUTION_Y (d) = XInternAtom (D, "RESOLUTION_Y", False);
1038 DEVICE_XATOM_SPACING (d) = XInternAtom (D, "SPACING", False);
1039 DEVICE_XATOM_AVERAGE_WIDTH (d) = XInternAtom (D, "AVERAGE_WIDTH", False);
1040 DEVICE_XATOM_CHARSET_REGISTRY(d) = XInternAtom (D, "CHARSET_REGISTRY",False);
1041 DEVICE_XATOM_CHARSET_ENCODING(d) = XInternAtom (D, "CHARSET_ENCODING",False);
1042 }