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e14dc92d JR |
1 | /* Font backend for the Microsoft W32 Uniscribe API. |
2 | Copyright (C) 2008 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 3, 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, Inc., 51 Franklin Street, Fifth Floor, | |
19 | Boston, MA 02110-1301, USA. */ | |
20 | ||
21 | #ifdef USE_FONT_BACKEND | |
22 | ||
23 | #include <config.h> | |
24 | /* Override API version - Uniscribe is only available as standard since | |
25 | Windows 2000, though most users of older systems will have it | |
26 | since it installs with Internet Explorer 5.0 and other software. | |
27 | We only enable the feature if it is available, so there is no chance | |
28 | of calling non-existant functions. */ | |
29 | #undef _WIN32_WINNT | |
30 | #define _WIN32_WINNT 0x500 | |
31 | #include <windows.h> | |
32 | #include <usp10.h> | |
33 | ||
34 | #include "lisp.h" | |
35 | #include "w32term.h" | |
36 | #include "frame.h" | |
37 | #include "dispextern.h" | |
38 | #include "character.h" | |
39 | #include "charset.h" | |
40 | #include "fontset.h" | |
41 | #include "font.h" | |
42 | #include "w32font.h" | |
43 | ||
44 | struct uniscribe_font_info | |
45 | { | |
46 | struct w32font_info w32_font; | |
47 | SCRIPT_CACHE cache; | |
48 | }; | |
49 | ||
50 | int uniscribe_available = 0; | |
51 | ||
52 | /* Defined in w32font.c, since it is required there as well. */ | |
53 | extern Lisp_Object Quniscribe; | |
54 | extern Lisp_Object Qopentype; | |
55 | ||
56 | extern int initialized; | |
57 | ||
58 | extern struct font_driver uniscribe_font_driver; | |
59 | ||
60 | /* EnumFontFamiliesEx callback. */ | |
61 | static int CALLBACK add_opentype_font_name_to_list P_ ((ENUMLOGFONTEX *, | |
62 | NEWTEXTMETRICEX *, | |
63 | DWORD, LPARAM)); | |
64 | /* Used by uniscribe_otf_capability. */ | |
65 | static Lisp_Object otf_features (HDC context, char *table); | |
66 | ||
67 | static int | |
68 | memq_no_quit (elt, list) | |
69 | Lisp_Object elt, list; | |
70 | { | |
71 | while (CONSP (list) && ! EQ (XCAR (list), elt)) | |
72 | list = XCDR (list); | |
73 | return (CONSP (list)); | |
74 | } | |
75 | ||
76 | \f | |
77 | /* Font backend interface implementation. */ | |
78 | static Lisp_Object | |
79 | uniscribe_list (frame, font_spec) | |
80 | Lisp_Object frame, font_spec; | |
81 | { | |
82 | return w32font_list_internal (frame, font_spec, 1); | |
83 | } | |
84 | ||
85 | static Lisp_Object | |
86 | uniscribe_match (frame, font_spec) | |
87 | Lisp_Object frame, font_spec; | |
88 | { | |
89 | return w32font_match_internal (frame, font_spec, 1); | |
90 | } | |
91 | ||
92 | static Lisp_Object | |
93 | uniscribe_list_family (frame) | |
94 | Lisp_Object frame; | |
95 | { | |
96 | Lisp_Object list = Qnil; | |
97 | LOGFONT font_match_pattern; | |
98 | HDC dc; | |
99 | FRAME_PTR f = XFRAME (frame); | |
100 | ||
101 | bzero (&font_match_pattern, sizeof (font_match_pattern)); | |
102 | /* Limit enumerated fonts to outline fonts to save time. */ | |
103 | font_match_pattern.lfOutPrecision = OUT_OUTLINE_PRECIS; | |
104 | ||
105 | dc = get_frame_dc (f); | |
106 | ||
107 | EnumFontFamiliesEx (dc, &font_match_pattern, | |
108 | (FONTENUMPROC) add_opentype_font_name_to_list, | |
109 | (LPARAM) &list, 0); | |
110 | release_frame_dc (f, dc); | |
111 | ||
112 | return list; | |
113 | } | |
114 | ||
115 | static struct font * | |
116 | uniscribe_open (f, font_entity, pixel_size) | |
117 | FRAME_PTR f; | |
118 | Lisp_Object font_entity; | |
119 | int pixel_size; | |
120 | { | |
121 | struct uniscribe_font_info *uniscribe_font | |
122 | = xmalloc (sizeof (struct uniscribe_font_info)); | |
123 | ||
124 | if (uniscribe_font == NULL) | |
125 | return NULL; | |
126 | ||
127 | if (!w32font_open_internal (f, font_entity, pixel_size, | |
128 | (struct w32font_info *) uniscribe_font)) | |
129 | { | |
130 | xfree (uniscribe_font); | |
131 | return NULL; | |
132 | } | |
133 | ||
134 | /* Initialize the cache for this font. */ | |
135 | uniscribe_font->cache = NULL; | |
136 | /* Mark the format as opentype */ | |
137 | uniscribe_font->w32_font.font.format = Qopentype; | |
138 | uniscribe_font->w32_font.font.driver = &uniscribe_font_driver; | |
139 | ||
140 | return (struct font *) uniscribe_font; | |
141 | } | |
142 | ||
143 | static void | |
144 | uniscribe_close (f, font) | |
145 | FRAME_PTR f; | |
146 | struct font *font; | |
147 | { | |
148 | struct uniscribe_font_info *uniscribe_font | |
149 | = (struct uniscribe_font_info *) font; | |
150 | ||
151 | if (uniscribe_font->cache) | |
152 | ScriptFreeCache (&uniscribe_font->cache); | |
153 | ||
154 | w32font_close (f, font); | |
155 | } | |
156 | ||
157 | /* Return a list describing which scripts/languages FONT supports by | |
158 | which GSUB/GPOS features of OpenType tables. */ | |
159 | static Lisp_Object | |
160 | uniscribe_otf_capability (font) | |
161 | struct font *font; | |
162 | { | |
163 | HDC context; | |
164 | HFONT old_font; | |
165 | struct frame *f; | |
166 | Lisp_Object capability = Fcons (Qnil, Qnil); | |
167 | Lisp_Object features; | |
168 | ||
169 | f = XFRAME (selected_frame); | |
170 | context = get_frame_dc (f); | |
171 | old_font = SelectObject (context, | |
172 | ((W32FontStruct *) (font->font.font))->hfont); | |
173 | ||
174 | features = otf_features (context, "GSUB"); | |
175 | XSETCAR (capability, features); | |
176 | features = otf_features (context, "GPOS"); | |
177 | XSETCDR (capability, features); | |
178 | ||
179 | SelectObject (context, old_font); | |
180 | release_frame_dc (f, context); | |
181 | ||
182 | return capability; | |
183 | } | |
184 | ||
185 | /* Uniscribe implementation of shape for font backend. | |
186 | ||
187 | Shape text in LGSTRING. See the docstring of `font-make-gstring' | |
188 | for the format of LGSTRING. If the (N+1)th element of LGSTRING | |
189 | is nil, input of shaping is from the 1st to (N)th elements. In | |
190 | each input glyph, FROM, TO, CHAR, and CODE are already set. | |
191 | ||
192 | This function updates all fields of the input glyphs. If the | |
193 | output glyphs (M) are more than the input glyphs (N), (N+1)th | |
194 | through (M)th elements of LGSTRING are updated possibly by making | |
195 | a new glyph object and storing it in LGSTRING. If (M) is greater | |
196 | than the length of LGSTRING, nil should be return. In that case, | |
197 | this function is called again with the larger LGSTRING. */ | |
198 | static Lisp_Object | |
199 | uniscribe_shape (lgstring) | |
200 | Lisp_Object lgstring; | |
201 | { | |
202 | struct font * font; | |
203 | struct uniscribe_font_info * uniscribe_font; | |
204 | EMACS_UINT nchars; | |
205 | int nitems, max_items, i, max_glyphs, done_glyphs, done_chars; | |
206 | wchar_t *chars; | |
207 | WORD *glyphs, *clusters; | |
208 | SCRIPT_ITEM *items; | |
209 | SCRIPT_CONTROL control; | |
210 | SCRIPT_VISATTR *attributes; | |
211 | int *advances; | |
212 | GOFFSET *offsets; | |
213 | ABC overall_metrics; | |
214 | MAT2 transform; | |
215 | HDC context; | |
216 | HFONT old_font; | |
217 | HRESULT result; | |
218 | struct frame * f; | |
219 | ||
220 | CHECK_FONT_GET_OBJECT (LGSTRING_FONT (lgstring), font); | |
221 | uniscribe_font = (struct uniscribe_font_info *) font; | |
222 | ||
223 | /* Get the chars from lgstring in a form we can use with uniscribe. */ | |
224 | max_glyphs = nchars = LGSTRING_LENGTH (lgstring); | |
225 | done_glyphs = done_chars = 0; | |
226 | chars = (wchar_t *) alloca (nchars * sizeof (wchar_t)); | |
227 | for (i = 0; i < nchars; i++) | |
228 | { | |
229 | /* lgstring can be bigger than the number of characters in it, in | |
230 | the case where more glyphs are required to display those characters. | |
231 | If that is the case, note the real number of characters. */ | |
232 | if (NILP (LGSTRING_GLYPH (lgstring, i))) | |
233 | nchars = i; | |
234 | else | |
235 | chars[i] = LGLYPH_CHAR (LGSTRING_GLYPH (lgstring, i)); | |
236 | } | |
237 | ||
238 | /* First we need to break up the glyph string into runs of glyphs that | |
239 | can be treated together. First try a single run. */ | |
240 | max_items = 2; | |
241 | items = (SCRIPT_ITEM *) xmalloc (sizeof (SCRIPT_ITEM) * max_items); | |
242 | bzero (&control, sizeof (control)); | |
243 | ||
244 | while ((result = ScriptItemize (chars, nchars, max_items, &control, NULL, | |
245 | items, &nitems)) == E_OUTOFMEMORY) | |
246 | { | |
247 | /* If that wasn't enough, keep trying with one more run. */ | |
248 | max_items++; | |
249 | items = (SCRIPT_ITEM *) xrealloc (items, | |
250 | sizeof (SCRIPT_ITEM) * max_items); | |
251 | } | |
252 | ||
253 | /* 0 = success in Microsoft's backwards world. */ | |
254 | if (result) | |
255 | { | |
256 | xfree (items); | |
257 | return Qnil; | |
258 | } | |
259 | ||
260 | f = XFRAME (selected_frame); | |
261 | context = get_frame_dc (f); | |
262 | old_font = SelectObject (context, | |
263 | ((W32FontStruct *) (font->font.font))->hfont); | |
264 | ||
265 | glyphs = alloca (max_glyphs * sizeof (WORD)); | |
266 | clusters = alloca (nchars * sizeof (WORD)); | |
267 | attributes = alloca (max_glyphs * sizeof (SCRIPT_VISATTR)); | |
268 | advances = alloca (max_glyphs * sizeof (int)); | |
269 | offsets = alloca (max_glyphs * sizeof (GOFFSET)); | |
270 | bzero (&transform, sizeof (transform)); | |
271 | transform.eM11.value = 1; | |
272 | transform.eM22.value = 1; | |
273 | ||
274 | for (i = 0; i < nitems; i++) | |
275 | { | |
276 | int nglyphs, nchars_in_run; | |
277 | nchars_in_run = items[i+1].iCharPos - items[i].iCharPos; | |
278 | ||
279 | result = ScriptShape (context, &(uniscribe_font->cache), | |
280 | chars + items[i].iCharPos, nchars_in_run, | |
281 | max_glyphs - done_glyphs, &(items[i].a), | |
282 | glyphs, clusters, attributes, &nglyphs); | |
283 | if (result == E_OUTOFMEMORY) | |
284 | { | |
285 | /* Need a bigger lgstring. */ | |
286 | lgstring = Qnil; | |
287 | break; | |
288 | } | |
289 | else if (result) | |
290 | { | |
291 | /* Can't shape this run - return results so far if any. */ | |
292 | break; | |
293 | } | |
294 | else | |
295 | { | |
296 | result = ScriptPlace (context, &(uniscribe_font->cache), | |
297 | glyphs, nglyphs, attributes, &(items[i].a), | |
298 | advances, offsets, &overall_metrics); | |
299 | if (!result) | |
300 | { | |
301 | int j, nclusters; | |
302 | ||
303 | for (j = 0; j < nglyphs; j++) | |
304 | { | |
305 | int lglyph_index = j + done_glyphs; | |
306 | Lisp_Object lglyph = LGSTRING_GLYPH (lgstring, lglyph_index); | |
307 | GLYPHMETRICS metrics; | |
308 | ||
309 | if (NILP (lglyph)) | |
310 | { | |
311 | lglyph = Fmake_vector (make_number (LGLYPH_SIZE), Qnil); | |
312 | LGSTRING_SET_GLYPH (lgstring, lglyph_index, lglyph); | |
313 | } | |
314 | LGLYPH_SET_CODE (lglyph, glyphs[j]); | |
315 | LGLYPH_SET_WIDTH (lglyph, advances[j]); | |
316 | if (offsets[j].du || offsets[j].dv) | |
317 | { | |
318 | Lisp_Object vec; | |
319 | /* Convert from logical inches. */ | |
320 | int dpi = FRAME_W32_DISPLAY_INFO (f)->resy; | |
321 | int dx = (int)(offsets[j].du * dpi / 72.27 + 0.5); | |
322 | int dy = (int)(offsets[j].dv * dpi / 72.27 + 0.5); | |
323 | vec = Fmake_vector (make_number (3), Qnil); | |
324 | ASET (vec, 0, make_number (dx)); | |
325 | ASET (vec, 1, make_number (dy)); | |
326 | /* Based on what ftfont.c does... */ | |
327 | ASET (vec, 2, make_number (advances[j])); | |
328 | LGLYPH_SET_ADJUSTMENT (lglyph, vec); | |
329 | } | |
330 | else | |
331 | LGLYPH_SET_ADJUSTMENT (lglyph, Qnil); | |
332 | ||
333 | if (GetGlyphOutlineW (context, glyphs[j], | |
334 | GGO_METRICS | GGO_GLYPH_INDEX, | |
335 | &metrics, 0, NULL, &transform) | |
336 | != GDI_ERROR) | |
337 | { | |
338 | LGLYPH_SET_LBEARING (lglyph, metrics.gmptGlyphOrigin.x); | |
339 | LGLYPH_SET_RBEARING (lglyph, | |
340 | metrics.gmBlackBoxX | |
341 | + metrics.gmptGlyphOrigin.x); | |
342 | LGLYPH_SET_ASCENT (lglyph, metrics.gmBlackBoxY); | |
343 | LGLYPH_SET_DESCENT (lglyph, | |
344 | (metrics.gmCellIncY | |
345 | - metrics.gmptGlyphOrigin.y | |
346 | - metrics.gmBlackBoxY)); | |
347 | } | |
348 | else | |
349 | { | |
350 | /* Defaults based on what we know from elsewhere. */ | |
351 | LGLYPH_SET_LBEARING (lglyph, 0); | |
352 | LGLYPH_SET_RBEARING (lglyph, advances[j]); | |
353 | LGLYPH_SET_ASCENT (lglyph, font->ascent); | |
354 | LGLYPH_SET_DESCENT (lglyph, font->descent); | |
355 | } | |
356 | } | |
357 | ||
358 | /* Set character codes as indicated in clusters. */ | |
359 | for (j = 0; j < nchars_in_run - 1; j++) | |
360 | { | |
361 | int k, start, end; | |
362 | wchar_t this_char = *(chars + items[i].iCharPos + j); | |
363 | ||
364 | start = clusters[i]; | |
365 | end = clusters[i+1]; | |
366 | if (start > end) | |
367 | { | |
368 | int temp = start; | |
369 | start = end; | |
370 | end = temp; | |
371 | } | |
372 | for (k = start; k < end; k++) | |
373 | { | |
374 | Lisp_Object lglyph = LGSTRING_GLYPH (lgstring, | |
375 | done_glyphs + k); | |
376 | LGLYPH_SET_CHAR (lglyph, this_char); | |
377 | } | |
378 | } | |
379 | /* Last one until end (or beginning) of string. */ | |
380 | { | |
381 | int k, start, end; | |
382 | wchar_t last_char = *(chars + items[i].iCharPos | |
383 | + nchars_in_run - 1); | |
384 | start = clusters[nchars_in_run - 1]; | |
385 | end = nglyphs; | |
386 | if (start < clusters[nchars_in_run - 2]) | |
387 | { | |
388 | end = start + 1; | |
389 | start = 0; | |
390 | } | |
391 | for (k = start; k < end; k++) | |
392 | { | |
393 | Lisp_Object lglyph = LGSTRING_GLYPH (lgstring, | |
394 | done_glyphs + k); | |
395 | LGLYPH_SET_CHAR (lglyph, last_char); | |
396 | } | |
397 | } | |
398 | } | |
399 | } | |
400 | done_glyphs += nglyphs; | |
401 | done_chars += nchars_in_run; | |
402 | } | |
403 | ||
404 | xfree (items); | |
405 | SelectObject (context, old_font); | |
406 | release_frame_dc (f, context); | |
407 | ||
408 | if (NILP (lgstring)) | |
409 | return Qnil; | |
410 | else | |
411 | return make_number (done_chars); | |
412 | } | |
413 | ||
414 | /* Uniscribe implementation of encode_char for font backend. | |
415 | Return a glyph code of FONT for characer C (Unicode code point). | |
416 | If FONT doesn't have such a glyph, return FONT_INVALID_CODE. */ | |
417 | static unsigned | |
418 | uniscribe_encode_char (font, c) | |
419 | struct font *font; | |
420 | int c; | |
421 | { | |
422 | wchar_t chars[1]; | |
423 | WORD indices[1]; | |
424 | HDC context; | |
425 | struct frame *f; | |
426 | HFONT old_font; | |
427 | DWORD retval; | |
428 | ||
429 | /* TODO: surrogates. */ | |
430 | if (c > 0xFFFF) | |
431 | return FONT_INVALID_CODE; | |
432 | ||
433 | chars[0] = (wchar_t) c; | |
434 | ||
435 | /* Use selected frame until API is updated to pass the frame. */ | |
436 | f = XFRAME (selected_frame); | |
437 | context = get_frame_dc (f); | |
438 | old_font = SelectObject (context, | |
439 | ((W32FontStruct *)(font->font.font))->hfont); | |
440 | ||
441 | retval = GetGlyphIndicesW (context, chars, 1, indices, | |
442 | GGI_MARK_NONEXISTING_GLYPHS); | |
443 | ||
444 | SelectObject (context, old_font); | |
445 | release_frame_dc (f, context); | |
446 | ||
447 | if (retval == 1) | |
448 | return indices[0] == 0xFFFF ? FONT_INVALID_CODE : indices[0]; | |
449 | else | |
450 | return FONT_INVALID_CODE; | |
451 | } | |
452 | ||
453 | /* | |
454 | Shared with w32font: | |
455 | Lisp_Object uniscribe_get_cache (Lisp_Object frame); | |
456 | void uniscribe_free_entity (Lisp_Object font_entity); | |
457 | int uniscribe_has_char (Lisp_Object entity, int c); | |
458 | int uniscribe_text_extents (struct font *font, unsigned *code, | |
459 | int nglyphs, struct font_metrics *metrics); | |
460 | int uniscribe_draw (struct glyph_string *s, int from, int to, | |
461 | int x, int y, int with_background); | |
462 | ||
463 | Unused: | |
464 | int uniscribe_prepare_face (FRAME_PTR f, struct face *face); | |
465 | void uniscribe_done_face (FRAME_PTR f, struct face *face); | |
466 | int uniscribe_get_bitmap (struct font *font, unsigned code, | |
467 | struct font_bitmap *bitmap, int bits_per_pixel); | |
468 | void uniscribe_free_bitmap (struct font *font, struct font_bitmap *bitmap); | |
469 | void * uniscribe_get_outline (struct font *font, unsigned code); | |
470 | void uniscribe_free_outline (struct font *font, void *outline); | |
471 | int uniscribe_anchor_point (struct font *font, unsigned code, | |
472 | int index, int *x, int *y); | |
473 | int uniscribe_start_for_frame (FRAME_PTR f); | |
474 | int uniscribe_end_for_frame (FRAME_PTR f); | |
475 | ||
476 | */ | |
477 | ||
478 | \f | |
479 | /* Callback function for EnumFontFamiliesEx. | |
480 | Adds the name of opentype fonts to a Lisp list (passed in as the | |
481 | lParam arg). */ | |
482 | static int CALLBACK | |
483 | add_opentype_font_name_to_list (logical_font, physical_font, font_type, | |
484 | list_object) | |
485 | ENUMLOGFONTEX *logical_font; | |
486 | NEWTEXTMETRICEX *physical_font; | |
487 | DWORD font_type; | |
488 | LPARAM list_object; | |
489 | { | |
490 | Lisp_Object* list = (Lisp_Object *) list_object; | |
491 | Lisp_Object family; | |
492 | ||
493 | /* Skip vertical fonts (intended only for printing) */ | |
494 | if (logical_font->elfLogFont.lfFaceName[0] == '@') | |
495 | return 1; | |
496 | ||
497 | /* Skip non opentype fonts. Count old truetype fonts as opentype, | |
498 | as some of them do contain GPOS and GSUB data that Uniscribe | |
499 | can make use of. */ | |
500 | if (!(physical_font->ntmTm.ntmFlags & NTMFLAGS_OPENTYPE) | |
501 | && font_type != TRUETYPE_FONTTYPE) | |
502 | return 1; | |
503 | ||
504 | family = intern_downcase (logical_font->elfLogFont.lfFaceName, | |
505 | strlen (logical_font->elfLogFont.lfFaceName)); | |
506 | if (! memq_no_quit (family, *list)) | |
507 | *list = Fcons (family, *list); | |
508 | ||
509 | return 1; | |
510 | } | |
511 | ||
512 | \f | |
513 | /* :otf property handling. | |
514 | Since the necessary Uniscribe APIs for getting font tag information | |
515 | are only available in Vista, we need to parse the font data directly | |
516 | according to the OpenType Specification. */ | |
517 | ||
518 | /* Push into DWORD backwards to cope with endianness. */ | |
519 | #define OTF_TAG(STR) \ | |
520 | ((STR[3] << 24) | (STR[2] << 16) | (STR[1] << 8) | STR[0]) | |
521 | ||
522 | #define OTF_INT16_VAL(TABLE, OFFSET, PTR) \ | |
523 | do { \ | |
524 | BYTE temp, data[2]; \ | |
525 | if (GetFontData (context, TABLE, OFFSET, data, 2) != 2) \ | |
526 | goto font_table_error; \ | |
527 | temp = data[0], data[0] = data[1], data[1] = temp; \ | |
528 | memcpy (PTR, data, 2); \ | |
529 | } while (0) | |
530 | ||
531 | /* Do not reverse the bytes, because we will compare with a OTF_TAG value | |
532 | that has them reversed already. */ | |
533 | #define OTF_DWORDTAG_VAL(TABLE, OFFSET, PTR) \ | |
534 | do { \ | |
535 | if (GetFontData (context, TABLE, OFFSET, PTR, 4) != 4) \ | |
536 | goto font_table_error; \ | |
537 | } while (0) | |
538 | ||
539 | #define OTF_TAG_VAL(TABLE, OFFSET, STR) \ | |
540 | do { \ | |
541 | if (GetFontData (context, TABLE, OFFSET, STR, 4) != 4) \ | |
542 | goto font_table_error; \ | |
543 | STR[4] = '\0'; \ | |
544 | } while (0) | |
545 | ||
546 | static char* NOTHING = " "; | |
547 | ||
548 | #define SNAME(VAL) SDATA (STRINGP (VAL) ? VAL : SYMBOL_NAME (VAL)) | |
549 | ||
550 | /* Check if font supports the otf script/language/features specified. | |
551 | OTF_SPEC is in the format | |
552 | (script lang [(gsub_feature ...)|nil] [(gpos_feature ...)]?) */ | |
553 | int uniscribe_check_otf (font, otf_spec) | |
554 | LOGFONT *font; | |
555 | Lisp_Object otf_spec; | |
556 | { | |
557 | Lisp_Object script, lang, rest; | |
558 | Lisp_Object features[2]; | |
559 | DWORD feature_tables[2]; | |
560 | DWORD script_tag, default_script, lang_tag = 0; | |
561 | struct frame * f; | |
562 | HDC context; | |
563 | HFONT check_font, old_font; | |
564 | DWORD table; | |
565 | int i, retval = 0; | |
566 | ||
567 | /* Break otf_spec into its components. */ | |
568 | script = XCAR (otf_spec); | |
569 | rest = XCDR (otf_spec); | |
570 | ||
571 | lang = XCAR (rest); | |
572 | rest = XCDR (rest); | |
573 | ||
574 | features[0] = XCAR (rest); | |
575 | rest = XCDR (rest); | |
576 | if (NILP (rest)) | |
577 | features[1] = Qnil; | |
578 | else | |
579 | features[1] = XCAR (rest); | |
580 | ||
581 | /* Set up tags we will use in the search. */ | |
582 | feature_tables[0] = OTF_TAG ("GSUB"); | |
583 | feature_tables[1] = OTF_TAG ("GPOS"); | |
584 | default_script = OTF_TAG ("DFLT"); | |
585 | if (NILP (script)) | |
586 | script_tag = default_script; | |
587 | else | |
588 | script_tag = OTF_TAG (SNAME (script)); | |
589 | if (!NILP (lang)) | |
590 | lang_tag = OTF_TAG (SNAME (lang)); | |
591 | ||
592 | /* Set up graphics context so we can use the font. */ | |
593 | f = XFRAME (selected_frame); | |
594 | context = get_frame_dc (f); | |
595 | check_font = CreateFontIndirect (font); | |
596 | old_font = SelectObject (context, check_font); | |
597 | ||
598 | /* Scan GSUB and GPOS tables. */ | |
599 | for (i = 0; i < 2; i++) | |
600 | { | |
601 | int j, n_match_features; | |
602 | unsigned short scriptlist_table, feature_table, n_scripts; | |
603 | unsigned short script_table, langsys_table, n_langs; | |
604 | unsigned short feature_index, n_features; | |
605 | DWORD tbl = feature_tables[i]; | |
606 | Lisp_Object feature; | |
607 | ||
608 | /* Skip if no features requested from this table. */ | |
609 | if (NILP (features[i])) | |
610 | continue; | |
611 | ||
612 | /* Read GPOS/GSUB header. */ | |
613 | OTF_INT16_VAL (tbl, 4, &scriptlist_table); | |
614 | OTF_INT16_VAL (tbl, 6, &feature_table); | |
615 | OTF_INT16_VAL (tbl, scriptlist_table, &n_scripts); | |
616 | ||
617 | /* Find the appropriate script table. */ | |
618 | script_table = 0; | |
619 | for (j = 0; j < n_scripts; j++) | |
620 | { | |
621 | DWORD script_id; | |
622 | OTF_DWORDTAG_VAL (tbl, scriptlist_table + 2 + j * 6, &script_id); | |
623 | if (script_id == script_tag) | |
624 | { | |
625 | OTF_INT16_VAL (tbl, scriptlist_table + 6 + j * 6, &script_table); | |
626 | break; | |
627 | } | |
628 | /* If there is a DFLT script defined in the font, use it | |
629 | if the specified script is not found. */ | |
630 | else if (script_id == default_script) | |
631 | OTF_INT16_VAL (tbl, scriptlist_table + 6 + j * 6, &script_table); | |
632 | } | |
633 | /* If no specific or default script table was found, then this font | |
634 | does not support the script. */ | |
635 | if (!script_table) | |
636 | goto no_support; | |
637 | ||
638 | /* Offset is from beginning of scriptlist_table. */ | |
639 | script_table += scriptlist_table; | |
640 | ||
641 | /* Get default langsys table. */ | |
642 | OTF_INT16_VAL (tbl, script_table, &langsys_table); | |
643 | ||
644 | /* If lang was specified, see if font contains a specific entry. */ | |
645 | if (!NILP (lang)) | |
646 | { | |
647 | OTF_INT16_VAL (tbl, script_table + 2, &n_langs); | |
648 | ||
649 | for (j = 0; j < n_langs; j++) | |
650 | { | |
651 | DWORD lang_id; | |
652 | OTF_DWORDTAG_VAL (tbl, script_table + 4 + j * 6, &lang_id); | |
653 | if (lang_id == lang_tag) | |
654 | { | |
655 | OTF_INT16_VAL (tbl, script_table + 8 + j * 6, &langsys_table); | |
656 | break; | |
657 | } | |
658 | } | |
659 | } | |
660 | ||
661 | if (!langsys_table) | |
662 | goto no_support; | |
663 | ||
664 | /* Offset is from beginning of script table. */ | |
665 | langsys_table += script_table; | |
666 | ||
667 | /* Check the features. Features may contain nil according to | |
668 | documentation in font_prop_validate_otf, so count them. */ | |
669 | n_match_features = 0; | |
670 | rest = features[i]; | |
671 | for (feature = XCAR (rest); CONSP (rest); feature = XCAR (rest)) | |
672 | { | |
673 | rest = XCDR (rest); | |
674 | if (!NILP (feature)) | |
675 | n_match_features++; | |
676 | } | |
677 | ||
678 | /* If there are no features to check, skip checking. */ | |
679 | if (!n_match_features) | |
680 | continue; | |
681 | ||
682 | /* First check required feature (if any). */ | |
683 | OTF_INT16_VAL (tbl, langsys_table + 2, &feature_index); | |
684 | if (feature_index != 0xFFFF) | |
685 | { | |
686 | char feature_id[5]; | |
687 | OTF_TAG_VAL (tbl, feature_table + 2 + feature_index * 6, feature_id); | |
688 | OTF_TAG_VAL (tbl, feature_table + 2 + feature_index * 6, feature_id); | |
689 | /* Assume no duplicates in the font table. This allows us to mark | |
690 | the features off by simply decrementing a counter. */ | |
691 | if (!NILP (Fmemq (intern (feature_id), features[i]))) | |
692 | n_match_features--; | |
693 | } | |
694 | /* Now check all the other features. */ | |
695 | OTF_INT16_VAL (tbl, langsys_table + 4, &n_features); | |
696 | for (j = 0; j < n_features; j++) | |
697 | { | |
698 | char feature_id[5]; | |
699 | OTF_INT16_VAL (tbl, langsys_table + 6 + j * 2, &feature_index); | |
700 | OTF_TAG_VAL (tbl, feature_table + 2 + feature_index * 6, feature_id); | |
701 | /* Assume no duplicates in the font table. This allows us to mark | |
702 | the features off by simply decrementing a counter. */ | |
703 | if (!NILP (Fmemq (intern (feature_id), features[i]))) | |
704 | n_match_features--; | |
705 | } | |
706 | ||
707 | if (n_match_features > 0) | |
708 | goto no_support; | |
709 | } | |
710 | ||
711 | retval = 1; | |
712 | ||
713 | no_support: | |
714 | font_table_error: | |
715 | /* restore graphics context. */ | |
716 | SelectObject (context, old_font); | |
717 | DeleteObject (check_font); | |
718 | release_frame_dc (f, context); | |
719 | ||
720 | return retval; | |
721 | } | |
722 | ||
723 | static Lisp_Object | |
724 | otf_features (HDC context, char *table) | |
725 | { | |
726 | Lisp_Object script_list = Qnil; | |
727 | unsigned short scriptlist_table, n_scripts, feature_table; | |
728 | DWORD tbl = OTF_TAG (table); | |
729 | int i, j, k; | |
730 | ||
731 | /* Look for scripts in the table. */ | |
732 | OTF_INT16_VAL (tbl, 4, &scriptlist_table); | |
733 | OTF_INT16_VAL (tbl, 6, &feature_table); | |
734 | OTF_INT16_VAL (tbl, scriptlist_table, &n_scripts); | |
735 | ||
736 | for (i = 0; i < n_scripts; i++) | |
737 | { | |
738 | char script[5], lang[5]; | |
739 | unsigned short script_table, lang_count, langsys_table, feature_count; | |
740 | Lisp_Object script_tag, langsys_list, langsys_tag, feature_list; | |
741 | unsigned short record_offset = scriptlist_table + 2 + i * 6; | |
742 | OTF_TAG_VAL (tbl, record_offset, script); | |
743 | OTF_INT16_VAL (tbl, record_offset + 4, &script_table); | |
744 | ||
745 | /* Offset is from beginning of script table. */ | |
746 | script_table += scriptlist_table; | |
747 | ||
748 | script_tag = intern (script); | |
749 | langsys_list = Qnil; | |
750 | ||
751 | /* Optional default lang. */ | |
752 | OTF_INT16_VAL (tbl, script_table, &langsys_table); | |
753 | if (langsys_table) | |
754 | { | |
755 | /* Offset is from beginning of script table. */ | |
756 | langsys_table += script_table; | |
757 | ||
758 | langsys_tag = Qnil; | |
759 | feature_list = Qnil; | |
760 | OTF_INT16_VAL (tbl, langsys_table + 4, &feature_count); | |
761 | for (k = 0; k < feature_count; k++) | |
762 | { | |
763 | char feature[5]; | |
764 | unsigned short index; | |
765 | OTF_INT16_VAL (tbl, langsys_table + 6 + k * 2, &index); | |
766 | OTF_TAG_VAL (tbl, feature_table + 2 + index * 6, feature); | |
767 | feature_list = Fcons (intern (feature), feature_list); | |
768 | } | |
769 | langsys_list = Fcons (Fcons (langsys_tag, feature_list), | |
770 | langsys_list); | |
771 | } | |
772 | ||
773 | /* List of supported languages. */ | |
774 | OTF_INT16_VAL (tbl, script_table + 2, &lang_count); | |
775 | ||
776 | for (j = 0; j < lang_count; j++) | |
777 | { | |
778 | record_offset = script_table + 4 + j * 6; | |
779 | OTF_TAG_VAL (tbl, record_offset, lang); | |
780 | OTF_INT16_VAL (tbl, record_offset + 4, &langsys_table); | |
781 | ||
782 | /* Offset is from beginning of script table. */ | |
783 | langsys_table += script_table; | |
784 | ||
785 | langsys_tag = intern (lang); | |
786 | feature_list = Qnil; | |
787 | OTF_INT16_VAL (tbl, langsys_table + 4, &feature_count); | |
788 | for (k = 0; k < feature_count; k++) | |
789 | { | |
790 | char feature[5]; | |
791 | unsigned short index; | |
792 | OTF_INT16_VAL (tbl, langsys_table + 6 + k * 2, &index); | |
793 | OTF_TAG_VAL (tbl, feature_table + 2 + index * 6, feature); | |
794 | feature_list = Fcons (intern (feature), feature_list); | |
795 | } | |
796 | langsys_list = Fcons (Fcons (langsys_tag, feature_list), | |
797 | langsys_list); | |
798 | ||
799 | } | |
800 | ||
801 | script_list = Fcons (Fcons (script_tag, langsys_list), script_list); | |
802 | } | |
803 | ||
804 | return script_list; | |
805 | ||
806 | font_table_error: | |
807 | return Qnil; | |
808 | } | |
809 | ||
810 | #undef OTF_INT16_VAL | |
811 | #undef OTF_TAG_VAL | |
812 | #undef OTF_TAG | |
813 | ||
814 | \f | |
815 | struct font_driver uniscribe_font_driver = | |
816 | { | |
817 | 0, /* Quniscribe */ | |
818 | w32font_get_cache, | |
819 | uniscribe_list, | |
820 | uniscribe_match, | |
821 | uniscribe_list_family, | |
822 | NULL, /* free_entity */ | |
823 | uniscribe_open, | |
824 | uniscribe_close, | |
825 | NULL, /* prepare_face */ | |
826 | NULL, /* done_face */ | |
827 | w32font_has_char, | |
828 | uniscribe_encode_char, | |
829 | w32font_text_extents, | |
830 | w32font_draw, | |
831 | NULL, /* get_bitmap */ | |
832 | NULL, /* free_bitmap */ | |
833 | NULL, /* get_outline */ | |
834 | NULL, /* free_outline */ | |
835 | NULL, /* anchor_point */ | |
836 | uniscribe_otf_capability, /* Defined so (font-get FONTOBJ :otf) works. */ | |
837 | NULL, /* otf_drive - use shape instead. */ | |
838 | NULL, /* start_for_frame */ | |
839 | NULL, /* end_for_frame */ | |
840 | uniscribe_shape | |
841 | }; | |
842 | ||
843 | /* Note that this should be called at every startup, not just when dumping, | |
844 | as it needs to test for the existence of the Uniscribe library. */ | |
845 | void | |
846 | syms_of_w32uniscribe () | |
847 | { | |
848 | HMODULE uniscribe; | |
849 | ||
850 | /* Don't init uniscribe when dumping */ | |
851 | if (!initialized) | |
852 | return; | |
853 | ||
854 | /* Don't register if uniscribe is not available. */ | |
855 | uniscribe = GetModuleHandle ("usp10"); | |
856 | if (!uniscribe) | |
857 | return; | |
858 | ||
859 | uniscribe_font_driver.type = Quniscribe; | |
860 | uniscribe_available = 1; | |
861 | ||
862 | register_font_driver (&uniscribe_font_driver, NULL); | |
863 | } | |
864 | ||
865 | #endif /* USE_FONT_BACKEND */ |