1 /*
2 * Copyright © 1998-2004 David Turner and Werner Lemberg
3 * Copyright © 2006 Behdad Esfahbod
4 * Copyright © 2007,2008,2009 Red Hat, Inc.
5 * Copyright © 2012,2013 Google, Inc.
6 *
7 * This is part of HarfBuzz, a text shaping library.
8 *
9 * Permission is hereby granted, without written agreement and without
10 * license or royalty fees, to use, copy, modify, and distribute this
11 * software and its documentation for any purpose, provided that the
12 * above copyright notice and the following two paragraphs appear in
13 * all copies of this software.
14 *
15 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
16 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
17 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
18 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * DAMAGE.
20 *
21 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
22 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
23 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
24 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
25 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 *
27 * Red Hat Author(s): Behdad Esfahbod
28 * Google Author(s): Behdad Esfahbod
29 */
30
31 #include "hb-open-type-private.hh"
32 #include "hb-ot-layout-private.hh"
33
34 #include "hb-ot-layout-gdef-table.hh"
35 #include "hb-ot-layout-gsub-table.hh"
36 #include "hb-ot-layout-gpos-table.hh"
37 #include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise.
38
39 #include "hb-ot-map-private.hh"
40
41
HB_SHAPER_DATA_ENSURE_DECLARE(ot,face)42 HB_SHAPER_DATA_ENSURE_DECLARE(ot, face)
43
44 hb_ot_layout_t *
45 _hb_ot_layout_create (hb_face_t *face)
46 {
47 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
48 if (unlikely (!layout))
49 return NULL;
50
51 layout->gdef_blob = OT::Sanitizer<OT::GDEF>::sanitize (face->reference_table (HB_OT_TAG_GDEF));
52 layout->gdef = OT::Sanitizer<OT::GDEF>::lock_instance (layout->gdef_blob);
53
54 layout->gsub_blob = OT::Sanitizer<OT::GSUB>::sanitize (face->reference_table (HB_OT_TAG_GSUB));
55 layout->gsub = OT::Sanitizer<OT::GSUB>::lock_instance (layout->gsub_blob);
56
57 layout->gpos_blob = OT::Sanitizer<OT::GPOS>::sanitize (face->reference_table (HB_OT_TAG_GPOS));
58 layout->gpos = OT::Sanitizer<OT::GPOS>::lock_instance (layout->gpos_blob);
59
60 layout->math.init (face);
61 layout->fvar.init (face);
62 layout->avar.init (face);
63
64 {
65 /*
66 * The ugly business of blacklisting individual fonts' tables happen here!
67 * See this thread for why we finally had to bend in and do this:
68 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
69 */
70 unsigned int gdef_len = hb_blob_get_length (layout->gdef_blob);
71 unsigned int gsub_len = hb_blob_get_length (layout->gsub_blob);
72 unsigned int gpos_len = hb_blob_get_length (layout->gpos_blob);
73 if (0
74 /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */
75 || (442 == gdef_len && 42038 == gpos_len && 2874 == gsub_len)
76 /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */
77 || (430 == gdef_len && 40662 == gpos_len && 2874 == gsub_len)
78 /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */
79 || (442 == gdef_len && 39116 == gpos_len && 2874 == gsub_len)
80 /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */
81 || (430 == gdef_len && 39374 == gpos_len && 2874 == gsub_len)
82 /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */
83 || (490 == gdef_len && 41638 == gpos_len && 3046 == gsub_len)
84 /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */
85 || (478 == gdef_len && 41902 == gpos_len && 3046 == gsub_len)
86 )
87 {
88 /* In certain versions of Times New Roman Italic and Bold Italic,
89 * ASCII double quotation mark U+0022, mapped to glyph 5, has wrong
90 * glyph class 3 (mark) in GDEF. Nuke the GDEF to avoid zero-width
91 * double-quote. See:
92 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
93 */
94 if (3 == layout->gdef->get_glyph_class (5))
95 layout->gdef = &OT::Null(OT::GDEF);
96 }
97 else if (0
98 /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */
99 || (898 == gdef_len && 46470 == gpos_len && 12554 == gsub_len)
100 /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */
101 || (910 == gdef_len && 47732 == gpos_len && 12566 == gsub_len)
102 /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */
103 || (928 == gdef_len && 59332 == gpos_len && 23298 == gsub_len)
104 /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */
105 || (940 == gdef_len && 60732 == gpos_len && 23310 == gsub_len)
106 /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */
107 || (994 == gdef_len && 60336 == gpos_len && 24474 == gsub_len)
108 /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */
109 || (1006 == gdef_len && 61740 == gpos_len && 24470 == gsub_len)
110 /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */
111 || (832 == gdef_len && 47162 == gpos_len && 7324 == gsub_len)
112 /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */
113 || (844 == gdef_len && 45474 == gpos_len && 7302 == gsub_len)
114 /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */
115 || (192 == gdef_len && 7254 == gpos_len && 12638 == gsub_len)
116 /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */
117 || (192 == gdef_len && 7254 == gpos_len && 12690 == gsub_len)
118 /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */
119 /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */
120 || (188 == gdef_len && 3852 == gpos_len && 248 == gsub_len)
121 /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */
122 /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */
123 || (188 == gdef_len && 3426 == gpos_len && 264 == gsub_len)
124 /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */
125 || (1046 == gdef_len && 17112 == gpos_len && 71788 == gsub_len)
126 /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */
127 || (1058 == gdef_len && 17514 == gpos_len && 71794 == gsub_len)
128 /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */
129 || (1330 == gdef_len && 57938 == gpos_len && 109904 == gsub_len)
130 /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */
131 || (1330 == gdef_len && 58972 == gpos_len && 109904 == gsub_len)
132 )
133 {
134 /* Many versions of Tahoma have bad GDEF tables that incorrectly classify some spacing marks
135 * such as certain IPA symbols as glyph class 3. So do older versions of Microsoft Himalaya,
136 * and the version of Cantarell shipped by Ubuntu 16.04.
137 * Nuke the GDEF tables of these fonts to avoid unwanted width-zeroing.
138 * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925
139 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693
140 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875
141 */
142 layout->gdef = &OT::Null(OT::GDEF);
143 }
144 }
145
146 layout->gsub_lookup_count = layout->gsub->get_lookup_count ();
147 layout->gpos_lookup_count = layout->gpos->get_lookup_count ();
148
149 layout->gsub_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
150 layout->gpos_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
151
152 if (unlikely ((layout->gsub_lookup_count && !layout->gsub_accels) ||
153 (layout->gpos_lookup_count && !layout->gpos_accels)))
154 {
155 _hb_ot_layout_destroy (layout);
156 return NULL;
157 }
158
159 for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
160 layout->gsub_accels[i].init (layout->gsub->get_lookup (i));
161 for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
162 layout->gpos_accels[i].init (layout->gpos->get_lookup (i));
163
164 return layout;
165 }
166
167 void
_hb_ot_layout_destroy(hb_ot_layout_t * layout)168 _hb_ot_layout_destroy (hb_ot_layout_t *layout)
169 {
170 for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
171 layout->gsub_accels[i].fini ();
172 for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
173 layout->gpos_accels[i].fini ();
174
175 free (layout->gsub_accels);
176 free (layout->gpos_accels);
177
178 hb_blob_destroy (layout->gdef_blob);
179 hb_blob_destroy (layout->gsub_blob);
180 hb_blob_destroy (layout->gpos_blob);
181
182 layout->math.fini ();
183 layout->fvar.fini ();
184 layout->avar.fini ();
185
186 free (layout);
187 }
188
189 static inline const OT::GDEF&
_get_gdef(hb_face_t * face)190 _get_gdef (hb_face_t *face)
191 {
192 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GDEF);
193 return *hb_ot_layout_from_face (face)->gdef;
194 }
195 static inline const OT::GSUB&
_get_gsub(hb_face_t * face)196 _get_gsub (hb_face_t *face)
197 {
198 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB);
199 return *hb_ot_layout_from_face (face)->gsub;
200 }
201 static inline const OT::GPOS&
_get_gpos(hb_face_t * face)202 _get_gpos (hb_face_t *face)
203 {
204 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GPOS);
205 return *hb_ot_layout_from_face (face)->gpos;
206 }
207
208 /*
209 * GDEF
210 */
211
212 hb_bool_t
hb_ot_layout_has_glyph_classes(hb_face_t * face)213 hb_ot_layout_has_glyph_classes (hb_face_t *face)
214 {
215 return _get_gdef (face).has_glyph_classes ();
216 }
217
218 /**
219 * hb_ot_layout_get_glyph_class:
220 *
221 * Since: 0.9.7
222 **/
223 hb_ot_layout_glyph_class_t
hb_ot_layout_get_glyph_class(hb_face_t * face,hb_codepoint_t glyph)224 hb_ot_layout_get_glyph_class (hb_face_t *face,
225 hb_codepoint_t glyph)
226 {
227 return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph);
228 }
229
230 /**
231 * hb_ot_layout_get_glyphs_in_class:
232 *
233 * Since: 0.9.7
234 **/
235 void
hb_ot_layout_get_glyphs_in_class(hb_face_t * face,hb_ot_layout_glyph_class_t klass,hb_set_t * glyphs)236 hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
237 hb_ot_layout_glyph_class_t klass,
238 hb_set_t *glyphs /* OUT */)
239 {
240 return _get_gdef (face).get_glyphs_in_class (klass, glyphs);
241 }
242
243 unsigned int
hb_ot_layout_get_attach_points(hb_face_t * face,hb_codepoint_t glyph,unsigned int start_offset,unsigned int * point_count,unsigned int * point_array)244 hb_ot_layout_get_attach_points (hb_face_t *face,
245 hb_codepoint_t glyph,
246 unsigned int start_offset,
247 unsigned int *point_count /* IN/OUT */,
248 unsigned int *point_array /* OUT */)
249 {
250 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
251 }
252
253 unsigned int
hb_ot_layout_get_ligature_carets(hb_font_t * font,hb_direction_t direction,hb_codepoint_t glyph,unsigned int start_offset,unsigned int * caret_count,int * caret_array)254 hb_ot_layout_get_ligature_carets (hb_font_t *font,
255 hb_direction_t direction,
256 hb_codepoint_t glyph,
257 unsigned int start_offset,
258 unsigned int *caret_count /* IN/OUT */,
259 int *caret_array /* OUT */)
260 {
261 return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
262 }
263
264
265 /*
266 * GSUB/GPOS
267 */
268
269 static const OT::GSUBGPOS&
get_gsubgpos_table(hb_face_t * face,hb_tag_t table_tag)270 get_gsubgpos_table (hb_face_t *face,
271 hb_tag_t table_tag)
272 {
273 switch (table_tag) {
274 case HB_OT_TAG_GSUB: return _get_gsub (face);
275 case HB_OT_TAG_GPOS: return _get_gpos (face);
276 default: return OT::Null(OT::GSUBGPOS);
277 }
278 }
279
280
281 unsigned int
hb_ot_layout_table_get_script_tags(hb_face_t * face,hb_tag_t table_tag,unsigned int start_offset,unsigned int * script_count,hb_tag_t * script_tags)282 hb_ot_layout_table_get_script_tags (hb_face_t *face,
283 hb_tag_t table_tag,
284 unsigned int start_offset,
285 unsigned int *script_count /* IN/OUT */,
286 hb_tag_t *script_tags /* OUT */)
287 {
288 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
289
290 return g.get_script_tags (start_offset, script_count, script_tags);
291 }
292
293 #define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
294
295 hb_bool_t
hb_ot_layout_table_find_script(hb_face_t * face,hb_tag_t table_tag,hb_tag_t script_tag,unsigned int * script_index)296 hb_ot_layout_table_find_script (hb_face_t *face,
297 hb_tag_t table_tag,
298 hb_tag_t script_tag,
299 unsigned int *script_index)
300 {
301 ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
302 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
303
304 if (g.find_script_index (script_tag, script_index))
305 return true;
306
307 /* try finding 'DFLT' */
308 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
309 return false;
310
311 /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
312 * including many versions of DejaVu Sans Mono! */
313 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
314 return false;
315
316 /* try with 'latn'; some old fonts put their features there even though
317 they're really trying to support Thai, for example :( */
318 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index))
319 return false;
320
321 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
322 return false;
323 }
324
325 hb_bool_t
hb_ot_layout_table_choose_script(hb_face_t * face,hb_tag_t table_tag,const hb_tag_t * script_tags,unsigned int * script_index,hb_tag_t * chosen_script)326 hb_ot_layout_table_choose_script (hb_face_t *face,
327 hb_tag_t table_tag,
328 const hb_tag_t *script_tags,
329 unsigned int *script_index,
330 hb_tag_t *chosen_script)
331 {
332 ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
333 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
334
335 while (*script_tags)
336 {
337 if (g.find_script_index (*script_tags, script_index)) {
338 if (chosen_script)
339 *chosen_script = *script_tags;
340 return true;
341 }
342 script_tags++;
343 }
344
345 /* try finding 'DFLT' */
346 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
347 if (chosen_script)
348 *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
349 return false;
350 }
351
352 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
353 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
354 if (chosen_script)
355 *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
356 return false;
357 }
358
359 /* try with 'latn'; some old fonts put their features there even though
360 they're really trying to support Thai, for example :( */
361 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
362 if (chosen_script)
363 *chosen_script = HB_OT_TAG_LATIN_SCRIPT;
364 return false;
365 }
366
367 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
368 if (chosen_script)
369 *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
370 return false;
371 }
372
373 unsigned int
hb_ot_layout_table_get_feature_tags(hb_face_t * face,hb_tag_t table_tag,unsigned int start_offset,unsigned int * feature_count,hb_tag_t * feature_tags)374 hb_ot_layout_table_get_feature_tags (hb_face_t *face,
375 hb_tag_t table_tag,
376 unsigned int start_offset,
377 unsigned int *feature_count /* IN/OUT */,
378 hb_tag_t *feature_tags /* OUT */)
379 {
380 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
381
382 return g.get_feature_tags (start_offset, feature_count, feature_tags);
383 }
384
385 hb_bool_t
hb_ot_layout_table_find_feature(hb_face_t * face,hb_tag_t table_tag,hb_tag_t feature_tag,unsigned int * feature_index)386 hb_ot_layout_table_find_feature (hb_face_t *face,
387 hb_tag_t table_tag,
388 hb_tag_t feature_tag,
389 unsigned int *feature_index)
390 {
391 ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
392 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
393
394 unsigned int num_features = g.get_feature_count ();
395 for (unsigned int i = 0; i < num_features; i++)
396 {
397 if (feature_tag == g.get_feature_tag (i)) {
398 if (feature_index) *feature_index = i;
399 return true;
400 }
401 }
402
403 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
404 return false;
405 }
406
407
408 unsigned int
hb_ot_layout_script_get_language_tags(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int start_offset,unsigned int * language_count,hb_tag_t * language_tags)409 hb_ot_layout_script_get_language_tags (hb_face_t *face,
410 hb_tag_t table_tag,
411 unsigned int script_index,
412 unsigned int start_offset,
413 unsigned int *language_count /* IN/OUT */,
414 hb_tag_t *language_tags /* OUT */)
415 {
416 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
417
418 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
419 }
420
421 hb_bool_t
hb_ot_layout_script_find_language(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,hb_tag_t language_tag,unsigned int * language_index)422 hb_ot_layout_script_find_language (hb_face_t *face,
423 hb_tag_t table_tag,
424 unsigned int script_index,
425 hb_tag_t language_tag,
426 unsigned int *language_index)
427 {
428 ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
429 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
430
431 if (s.find_lang_sys_index (language_tag, language_index))
432 return true;
433
434 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
435 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
436 return false;
437
438 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
439 return false;
440 }
441
442 hb_bool_t
hb_ot_layout_language_get_required_feature_index(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,unsigned int * feature_index)443 hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
444 hb_tag_t table_tag,
445 unsigned int script_index,
446 unsigned int language_index,
447 unsigned int *feature_index)
448 {
449 return hb_ot_layout_language_get_required_feature (face,
450 table_tag,
451 script_index,
452 language_index,
453 feature_index,
454 NULL);
455 }
456
457 /**
458 * hb_ot_layout_language_get_required_feature:
459 *
460 * Since: 0.9.30
461 **/
462 hb_bool_t
hb_ot_layout_language_get_required_feature(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,unsigned int * feature_index,hb_tag_t * feature_tag)463 hb_ot_layout_language_get_required_feature (hb_face_t *face,
464 hb_tag_t table_tag,
465 unsigned int script_index,
466 unsigned int language_index,
467 unsigned int *feature_index,
468 hb_tag_t *feature_tag)
469 {
470 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
471 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
472
473 unsigned int index = l.get_required_feature_index ();
474 if (feature_index) *feature_index = index;
475 if (feature_tag) *feature_tag = g.get_feature_tag (index);
476
477 return l.has_required_feature ();
478 }
479
480 unsigned int
hb_ot_layout_language_get_feature_indexes(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,unsigned int start_offset,unsigned int * feature_count,unsigned int * feature_indexes)481 hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
482 hb_tag_t table_tag,
483 unsigned int script_index,
484 unsigned int language_index,
485 unsigned int start_offset,
486 unsigned int *feature_count /* IN/OUT */,
487 unsigned int *feature_indexes /* OUT */)
488 {
489 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
490 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
491
492 return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
493 }
494
495 unsigned int
hb_ot_layout_language_get_feature_tags(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,unsigned int start_offset,unsigned int * feature_count,hb_tag_t * feature_tags)496 hb_ot_layout_language_get_feature_tags (hb_face_t *face,
497 hb_tag_t table_tag,
498 unsigned int script_index,
499 unsigned int language_index,
500 unsigned int start_offset,
501 unsigned int *feature_count /* IN/OUT */,
502 hb_tag_t *feature_tags /* OUT */)
503 {
504 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
505 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
506
507 ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
508 unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
509
510 if (feature_tags) {
511 unsigned int count = *feature_count;
512 for (unsigned int i = 0; i < count; i++)
513 feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
514 }
515
516 return ret;
517 }
518
519
520 hb_bool_t
hb_ot_layout_language_find_feature(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,hb_tag_t feature_tag,unsigned int * feature_index)521 hb_ot_layout_language_find_feature (hb_face_t *face,
522 hb_tag_t table_tag,
523 unsigned int script_index,
524 unsigned int language_index,
525 hb_tag_t feature_tag,
526 unsigned int *feature_index)
527 {
528 ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
529 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
530 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
531
532 unsigned int num_features = l.get_feature_count ();
533 for (unsigned int i = 0; i < num_features; i++) {
534 unsigned int f_index = l.get_feature_index (i);
535
536 if (feature_tag == g.get_feature_tag (f_index)) {
537 if (feature_index) *feature_index = f_index;
538 return true;
539 }
540 }
541
542 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
543 return false;
544 }
545
546 /**
547 * hb_ot_layout_feature_get_lookups:
548 *
549 * Since: 0.9.7
550 **/
551 unsigned int
hb_ot_layout_feature_get_lookups(hb_face_t * face,hb_tag_t table_tag,unsigned int feature_index,unsigned int start_offset,unsigned int * lookup_count,unsigned int * lookup_indexes)552 hb_ot_layout_feature_get_lookups (hb_face_t *face,
553 hb_tag_t table_tag,
554 unsigned int feature_index,
555 unsigned int start_offset,
556 unsigned int *lookup_count /* IN/OUT */,
557 unsigned int *lookup_indexes /* OUT */)
558 {
559 return hb_ot_layout_feature_with_variations_get_lookups (face,
560 table_tag,
561 feature_index,
562 HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
563 start_offset,
564 lookup_count,
565 lookup_indexes);
566 }
567
568 /**
569 * hb_ot_layout_table_get_lookup_count:
570 *
571 * Since: 0.9.22
572 **/
573 unsigned int
hb_ot_layout_table_get_lookup_count(hb_face_t * face,hb_tag_t table_tag)574 hb_ot_layout_table_get_lookup_count (hb_face_t *face,
575 hb_tag_t table_tag)
576 {
577 switch (table_tag)
578 {
579 case HB_OT_TAG_GSUB:
580 {
581 return hb_ot_layout_from_face (face)->gsub_lookup_count;
582 }
583 case HB_OT_TAG_GPOS:
584 {
585 return hb_ot_layout_from_face (face)->gpos_lookup_count;
586 }
587 }
588 return 0;
589 }
590
591 static void
_hb_ot_layout_collect_lookups_lookups(hb_face_t * face,hb_tag_t table_tag,unsigned int feature_index,hb_set_t * lookup_indexes)592 _hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
593 hb_tag_t table_tag,
594 unsigned int feature_index,
595 hb_set_t *lookup_indexes /* OUT */)
596 {
597 unsigned int lookup_indices[32];
598 unsigned int offset, len;
599
600 offset = 0;
601 do {
602 len = ARRAY_LENGTH (lookup_indices);
603 hb_ot_layout_feature_get_lookups (face,
604 table_tag,
605 feature_index,
606 offset, &len,
607 lookup_indices);
608
609 for (unsigned int i = 0; i < len; i++)
610 lookup_indexes->add (lookup_indices[i]);
611
612 offset += len;
613 } while (len == ARRAY_LENGTH (lookup_indices));
614 }
615
616 static void
_hb_ot_layout_collect_lookups_features(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,unsigned int language_index,const hb_tag_t * features,hb_set_t * lookup_indexes)617 _hb_ot_layout_collect_lookups_features (hb_face_t *face,
618 hb_tag_t table_tag,
619 unsigned int script_index,
620 unsigned int language_index,
621 const hb_tag_t *features,
622 hb_set_t *lookup_indexes /* OUT */)
623 {
624 if (!features)
625 {
626 unsigned int required_feature_index;
627 if (hb_ot_layout_language_get_required_feature (face,
628 table_tag,
629 script_index,
630 language_index,
631 &required_feature_index,
632 NULL))
633 _hb_ot_layout_collect_lookups_lookups (face,
634 table_tag,
635 required_feature_index,
636 lookup_indexes);
637
638 /* All features */
639 unsigned int feature_indices[32];
640 unsigned int offset, len;
641
642 offset = 0;
643 do {
644 len = ARRAY_LENGTH (feature_indices);
645 hb_ot_layout_language_get_feature_indexes (face,
646 table_tag,
647 script_index,
648 language_index,
649 offset, &len,
650 feature_indices);
651
652 for (unsigned int i = 0; i < len; i++)
653 _hb_ot_layout_collect_lookups_lookups (face,
654 table_tag,
655 feature_indices[i],
656 lookup_indexes);
657
658 offset += len;
659 } while (len == ARRAY_LENGTH (feature_indices));
660 }
661 else
662 {
663 for (; *features; features++)
664 {
665 unsigned int feature_index;
666 if (hb_ot_layout_language_find_feature (face,
667 table_tag,
668 script_index,
669 language_index,
670 *features,
671 &feature_index))
672 _hb_ot_layout_collect_lookups_lookups (face,
673 table_tag,
674 feature_index,
675 lookup_indexes);
676 }
677 }
678 }
679
680 static void
_hb_ot_layout_collect_lookups_languages(hb_face_t * face,hb_tag_t table_tag,unsigned int script_index,const hb_tag_t * languages,const hb_tag_t * features,hb_set_t * lookup_indexes)681 _hb_ot_layout_collect_lookups_languages (hb_face_t *face,
682 hb_tag_t table_tag,
683 unsigned int script_index,
684 const hb_tag_t *languages,
685 const hb_tag_t *features,
686 hb_set_t *lookup_indexes /* OUT */)
687 {
688 _hb_ot_layout_collect_lookups_features (face,
689 table_tag,
690 script_index,
691 HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
692 features,
693 lookup_indexes);
694
695 if (!languages)
696 {
697 /* All languages */
698 unsigned int count = hb_ot_layout_script_get_language_tags (face,
699 table_tag,
700 script_index,
701 0, NULL, NULL);
702 for (unsigned int language_index = 0; language_index < count; language_index++)
703 _hb_ot_layout_collect_lookups_features (face,
704 table_tag,
705 script_index,
706 language_index,
707 features,
708 lookup_indexes);
709 }
710 else
711 {
712 for (; *languages; languages++)
713 {
714 unsigned int language_index;
715 if (hb_ot_layout_script_find_language (face,
716 table_tag,
717 script_index,
718 *languages,
719 &language_index))
720 _hb_ot_layout_collect_lookups_features (face,
721 table_tag,
722 script_index,
723 language_index,
724 features,
725 lookup_indexes);
726 }
727 }
728 }
729
730 /**
731 * hb_ot_layout_collect_lookups:
732 *
733 * Since: 0.9.8
734 **/
735 void
hb_ot_layout_collect_lookups(hb_face_t * face,hb_tag_t table_tag,const hb_tag_t * scripts,const hb_tag_t * languages,const hb_tag_t * features,hb_set_t * lookup_indexes)736 hb_ot_layout_collect_lookups (hb_face_t *face,
737 hb_tag_t table_tag,
738 const hb_tag_t *scripts,
739 const hb_tag_t *languages,
740 const hb_tag_t *features,
741 hb_set_t *lookup_indexes /* OUT */)
742 {
743 if (!scripts)
744 {
745 /* All scripts */
746 unsigned int count = hb_ot_layout_table_get_script_tags (face,
747 table_tag,
748 0, NULL, NULL);
749 for (unsigned int script_index = 0; script_index < count; script_index++)
750 _hb_ot_layout_collect_lookups_languages (face,
751 table_tag,
752 script_index,
753 languages,
754 features,
755 lookup_indexes);
756 }
757 else
758 {
759 for (; *scripts; scripts++)
760 {
761 unsigned int script_index;
762 if (hb_ot_layout_table_find_script (face,
763 table_tag,
764 *scripts,
765 &script_index))
766 _hb_ot_layout_collect_lookups_languages (face,
767 table_tag,
768 script_index,
769 languages,
770 features,
771 lookup_indexes);
772 }
773 }
774 }
775
776 /**
777 * hb_ot_layout_lookup_collect_glyphs:
778 *
779 * Since: 0.9.7
780 **/
781 void
hb_ot_layout_lookup_collect_glyphs(hb_face_t * face,hb_tag_t table_tag,unsigned int lookup_index,hb_set_t * glyphs_before,hb_set_t * glyphs_input,hb_set_t * glyphs_after,hb_set_t * glyphs_output)782 hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
783 hb_tag_t table_tag,
784 unsigned int lookup_index,
785 hb_set_t *glyphs_before, /* OUT. May be NULL */
786 hb_set_t *glyphs_input, /* OUT. May be NULL */
787 hb_set_t *glyphs_after, /* OUT. May be NULL */
788 hb_set_t *glyphs_output /* OUT. May be NULL */)
789 {
790 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
791
792 OT::hb_collect_glyphs_context_t c (face,
793 glyphs_before,
794 glyphs_input,
795 glyphs_after,
796 glyphs_output);
797
798 switch (table_tag)
799 {
800 case HB_OT_TAG_GSUB:
801 {
802 const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
803 l.collect_glyphs (&c);
804 return;
805 }
806 case HB_OT_TAG_GPOS:
807 {
808 const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index);
809 l.collect_glyphs (&c);
810 return;
811 }
812 }
813 }
814
815
816 /* Variations support */
817
818 hb_bool_t
hb_ot_layout_table_find_feature_variations(hb_face_t * face,hb_tag_t table_tag,const int * coords,unsigned int num_coords,unsigned int * variations_index)819 hb_ot_layout_table_find_feature_variations (hb_face_t *face,
820 hb_tag_t table_tag,
821 const int *coords,
822 unsigned int num_coords,
823 unsigned int *variations_index /* out */)
824 {
825 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
826
827 return g.find_variations_index (coords, num_coords, variations_index);
828 }
829
830 unsigned int
hb_ot_layout_feature_with_variations_get_lookups(hb_face_t * face,hb_tag_t table_tag,unsigned int feature_index,unsigned int variations_index,unsigned int start_offset,unsigned int * lookup_count,unsigned int * lookup_indexes)831 hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face,
832 hb_tag_t table_tag,
833 unsigned int feature_index,
834 unsigned int variations_index,
835 unsigned int start_offset,
836 unsigned int *lookup_count /* IN/OUT */,
837 unsigned int *lookup_indexes /* OUT */)
838 {
839 ASSERT_STATIC (OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX);
840 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
841
842 const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
843
844 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
845 }
846
847
848 /*
849 * OT::GSUB
850 */
851
852 hb_bool_t
hb_ot_layout_has_substitution(hb_face_t * face)853 hb_ot_layout_has_substitution (hb_face_t *face)
854 {
855 return &_get_gsub (face) != &OT::Null(OT::GSUB);
856 }
857
858 /**
859 * hb_ot_layout_lookup_would_substitute:
860 *
861 * Since: 0.9.7
862 **/
863 hb_bool_t
hb_ot_layout_lookup_would_substitute(hb_face_t * face,unsigned int lookup_index,const hb_codepoint_t * glyphs,unsigned int glyphs_length,hb_bool_t zero_context)864 hb_ot_layout_lookup_would_substitute (hb_face_t *face,
865 unsigned int lookup_index,
866 const hb_codepoint_t *glyphs,
867 unsigned int glyphs_length,
868 hb_bool_t zero_context)
869 {
870 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false;
871 return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context);
872 }
873
874 hb_bool_t
hb_ot_layout_lookup_would_substitute_fast(hb_face_t * face,unsigned int lookup_index,const hb_codepoint_t * glyphs,unsigned int glyphs_length,hb_bool_t zero_context)875 hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
876 unsigned int lookup_index,
877 const hb_codepoint_t *glyphs,
878 unsigned int glyphs_length,
879 hb_bool_t zero_context)
880 {
881 if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false;
882 OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
883
884 const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
885
886 return l.would_apply (&c, &hb_ot_layout_from_face (face)->gsub_accels[lookup_index]);
887 }
888
889 void
hb_ot_layout_substitute_start(hb_font_t * font,hb_buffer_t * buffer)890 hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
891 {
892 OT::GSUB::substitute_start (font, buffer);
893 }
894
895 /**
896 * hb_ot_layout_lookup_substitute_closure:
897 *
898 * Since: 0.9.7
899 **/
900 void
hb_ot_layout_lookup_substitute_closure(hb_face_t * face,unsigned int lookup_index,hb_set_t * glyphs)901 hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
902 unsigned int lookup_index,
903 hb_set_t *glyphs)
904 {
905 OT::hb_closure_context_t c (face, glyphs);
906
907 const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
908
909 l.closure (&c);
910 }
911
912 /*
913 * OT::GPOS
914 */
915
916 hb_bool_t
hb_ot_layout_has_positioning(hb_face_t * face)917 hb_ot_layout_has_positioning (hb_face_t *face)
918 {
919 return &_get_gpos (face) != &OT::Null(OT::GPOS);
920 }
921
922 void
hb_ot_layout_position_start(hb_font_t * font,hb_buffer_t * buffer)923 hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
924 {
925 OT::GPOS::position_start (font, buffer);
926 }
927
928 void
hb_ot_layout_position_finish_advances(hb_font_t * font,hb_buffer_t * buffer)929 hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
930 {
931 OT::GPOS::position_finish_advances (font, buffer);
932 }
933
934 void
hb_ot_layout_position_finish_offsets(hb_font_t * font,hb_buffer_t * buffer)935 hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
936 {
937 OT::GPOS::position_finish_offsets (font, buffer);
938 }
939
940 /**
941 * hb_ot_layout_get_size_params:
942 *
943 * Since: 0.9.10
944 **/
945 hb_bool_t
hb_ot_layout_get_size_params(hb_face_t * face,unsigned int * design_size,unsigned int * subfamily_id,unsigned int * subfamily_name_id,unsigned int * range_start,unsigned int * range_end)946 hb_ot_layout_get_size_params (hb_face_t *face,
947 unsigned int *design_size, /* OUT. May be NULL */
948 unsigned int *subfamily_id, /* OUT. May be NULL */
949 unsigned int *subfamily_name_id, /* OUT. May be NULL */
950 unsigned int *range_start, /* OUT. May be NULL */
951 unsigned int *range_end /* OUT. May be NULL */)
952 {
953 const OT::GPOS &gpos = _get_gpos (face);
954 const hb_tag_t tag = HB_TAG ('s','i','z','e');
955
956 unsigned int num_features = gpos.get_feature_count ();
957 for (unsigned int i = 0; i < num_features; i++)
958 {
959 if (tag == gpos.get_feature_tag (i))
960 {
961 const OT::Feature &f = gpos.get_feature (i);
962 const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag);
963
964 if (params.designSize)
965 {
966 #define PARAM(a, A) if (a) *a = params.A
967 PARAM (design_size, designSize);
968 PARAM (subfamily_id, subfamilyID);
969 PARAM (subfamily_name_id, subfamilyNameID);
970 PARAM (range_start, rangeStart);
971 PARAM (range_end, rangeEnd);
972 #undef PARAM
973
974 return true;
975 }
976 }
977 }
978
979 #define PARAM(a, A) if (a) *a = 0
980 PARAM (design_size, designSize);
981 PARAM (subfamily_id, subfamilyID);
982 PARAM (subfamily_name_id, subfamilyNameID);
983 PARAM (range_start, rangeStart);
984 PARAM (range_end, rangeEnd);
985 #undef PARAM
986
987 return false;
988 }
989
990
991 /*
992 * Parts of different types are implemented here such that they have direct
993 * access to GSUB/GPOS lookups.
994 */
995
996
997 struct GSUBProxy
998 {
999 static const unsigned int table_index = 0;
1000 static const bool inplace = false;
1001 typedef OT::SubstLookup Lookup;
1002
GSUBProxyGSUBProxy1003 GSUBProxy (hb_face_t *face) :
1004 table (*hb_ot_layout_from_face (face)->gsub),
1005 accels (hb_ot_layout_from_face (face)->gsub_accels) {}
1006
1007 const OT::GSUB &table;
1008 const hb_ot_layout_lookup_accelerator_t *accels;
1009 };
1010
1011 struct GPOSProxy
1012 {
1013 static const unsigned int table_index = 1;
1014 static const bool inplace = true;
1015 typedef OT::PosLookup Lookup;
1016
GPOSProxyGPOSProxy1017 GPOSProxy (hb_face_t *face) :
1018 table (*hb_ot_layout_from_face (face)->gpos),
1019 accels (hb_ot_layout_from_face (face)->gpos_accels) {}
1020
1021 const OT::GPOS &table;
1022 const hb_ot_layout_lookup_accelerator_t *accels;
1023 };
1024
1025
1026 struct hb_get_subtables_context_t :
1027 OT::hb_dispatch_context_t<hb_get_subtables_context_t, hb_void_t, HB_DEBUG_APPLY>
1028 {
1029 template <typename Type>
apply_tohb_get_subtables_context_t1030 static inline bool apply_to (const void *obj, OT::hb_apply_context_t *c)
1031 {
1032 const Type *typed_obj = (const Type *) obj;
1033 return typed_obj->apply (c);
1034 }
1035
1036 typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_apply_context_t *c);
1037
1038 struct hb_applicable_t
1039 {
inithb_get_subtables_context_t::hb_applicable_t1040 inline void init (const void *obj_, hb_apply_func_t apply_func_)
1041 {
1042 obj = obj_;
1043 apply_func = apply_func_;
1044 }
1045
applyhb_get_subtables_context_t::hb_applicable_t1046 inline bool apply (OT::hb_apply_context_t *c) const { return apply_func (obj, c); }
1047
1048 private:
1049 const void *obj;
1050 hb_apply_func_t apply_func;
1051 };
1052
1053 typedef hb_auto_array_t<hb_applicable_t> array_t;
1054
1055 /* Dispatch interface. */
get_namehb_get_subtables_context_t1056 inline const char *get_name (void) { return "GET_SUBTABLES"; }
1057 template <typename T>
dispatchhb_get_subtables_context_t1058 inline return_t dispatch (const T &obj)
1059 {
1060 hb_applicable_t *entry = array.push();
1061 if (likely (entry))
1062 entry->init (&obj, apply_to<T>);
1063 return HB_VOID;
1064 }
default_return_valuehb_get_subtables_context_t1065 static return_t default_return_value (void) { return HB_VOID; }
stop_sublookup_iterationhb_get_subtables_context_t1066 bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
1067
hb_get_subtables_context_thb_get_subtables_context_t1068 hb_get_subtables_context_t (array_t &array_) :
1069 array (array_),
1070 debug_depth (0) {}
1071
1072 array_t &array;
1073 unsigned int debug_depth;
1074 };
1075
1076 static inline bool
apply_forward(OT::hb_apply_context_t * c,const hb_ot_layout_lookup_accelerator_t & accel,const hb_get_subtables_context_t::array_t & subtables)1077 apply_forward (OT::hb_apply_context_t *c,
1078 const hb_ot_layout_lookup_accelerator_t &accel,
1079 const hb_get_subtables_context_t::array_t &subtables)
1080 {
1081 bool ret = false;
1082 hb_buffer_t *buffer = c->buffer;
1083 while (buffer->idx < buffer->len && !buffer->in_error)
1084 {
1085 bool applied = false;
1086 if (accel.may_have (buffer->cur().codepoint) &&
1087 (buffer->cur().mask & c->lookup_mask) &&
1088 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1089 {
1090 for (unsigned int i = 0; i < subtables.len; i++)
1091 if (subtables[i].apply (c))
1092 {
1093 applied = true;
1094 break;
1095 }
1096 }
1097
1098 if (applied)
1099 ret = true;
1100 else
1101 buffer->next_glyph ();
1102 }
1103 return ret;
1104 }
1105
1106 static inline bool
apply_backward(OT::hb_apply_context_t * c,const hb_ot_layout_lookup_accelerator_t & accel,const hb_get_subtables_context_t::array_t & subtables)1107 apply_backward (OT::hb_apply_context_t *c,
1108 const hb_ot_layout_lookup_accelerator_t &accel,
1109 const hb_get_subtables_context_t::array_t &subtables)
1110 {
1111 bool ret = false;
1112 hb_buffer_t *buffer = c->buffer;
1113 do
1114 {
1115 if (accel.may_have (buffer->cur().codepoint) &&
1116 (buffer->cur().mask & c->lookup_mask) &&
1117 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1118 {
1119 for (unsigned int i = 0; i < subtables.len; i++)
1120 if (subtables[i].apply (c))
1121 {
1122 ret = true;
1123 break;
1124 }
1125 }
1126 /* The reverse lookup doesn't "advance" cursor (for good reason). */
1127 buffer->idx--;
1128
1129 }
1130 while ((int) buffer->idx >= 0);
1131 return ret;
1132 }
1133
1134 template <typename Proxy>
1135 static inline void
apply_string(OT::hb_apply_context_t * c,const typename Proxy::Lookup & lookup,const hb_ot_layout_lookup_accelerator_t & accel)1136 apply_string (OT::hb_apply_context_t *c,
1137 const typename Proxy::Lookup &lookup,
1138 const hb_ot_layout_lookup_accelerator_t &accel)
1139 {
1140 hb_buffer_t *buffer = c->buffer;
1141
1142 if (unlikely (!buffer->len || !c->lookup_mask))
1143 return;
1144
1145 c->set_lookup_props (lookup.get_props ());
1146
1147 hb_get_subtables_context_t::array_t subtables;
1148 hb_get_subtables_context_t c_get_subtables (subtables);
1149 lookup.dispatch (&c_get_subtables);
1150
1151 if (likely (!lookup.is_reverse ()))
1152 {
1153 /* in/out forward substitution/positioning */
1154 if (Proxy::table_index == 0)
1155 buffer->clear_output ();
1156 buffer->idx = 0;
1157
1158 bool ret;
1159 ret = apply_forward (c, accel, subtables);
1160 if (ret)
1161 {
1162 if (!Proxy::inplace)
1163 buffer->swap_buffers ();
1164 else
1165 assert (!buffer->has_separate_output ());
1166 }
1167 }
1168 else
1169 {
1170 /* in-place backward substitution/positioning */
1171 if (Proxy::table_index == 0)
1172 buffer->remove_output ();
1173 buffer->idx = buffer->len - 1;
1174
1175 apply_backward (c, accel, subtables);
1176 }
1177 }
1178
1179 template <typename Proxy>
apply(const Proxy & proxy,const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer) const1180 inline void hb_ot_map_t::apply (const Proxy &proxy,
1181 const hb_ot_shape_plan_t *plan,
1182 hb_font_t *font,
1183 hb_buffer_t *buffer) const
1184 {
1185 const unsigned int table_index = proxy.table_index;
1186 unsigned int i = 0;
1187 OT::hb_apply_context_t c (table_index, font, buffer);
1188 c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
1189
1190 for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) {
1191 const stage_map_t *stage = &stages[table_index][stage_index];
1192 for (; i < stage->last_lookup; i++)
1193 {
1194 unsigned int lookup_index = lookups[table_index][i].index;
1195 if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
1196 c.set_lookup_index (lookup_index);
1197 c.set_lookup_mask (lookups[table_index][i].mask);
1198 c.set_auto_zwj (lookups[table_index][i].auto_zwj);
1199 apply_string<Proxy> (&c,
1200 proxy.table.get_lookup (lookup_index),
1201 proxy.accels[lookup_index]);
1202 (void) buffer->message (font, "end lookup %d", lookup_index);
1203 }
1204
1205 if (stage->pause_func)
1206 {
1207 buffer->clear_output ();
1208 stage->pause_func (plan, font, buffer);
1209 }
1210 }
1211 }
1212
substitute(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer) const1213 void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1214 {
1215 GSUBProxy proxy (font->face);
1216 apply (proxy, plan, font, buffer);
1217 }
1218
position(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer) const1219 void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1220 {
1221 GPOSProxy proxy (font->face);
1222 apply (proxy, plan, font, buffer);
1223 }
1224
1225 HB_INTERNAL void
hb_ot_layout_substitute_lookup(OT::hb_apply_context_t * c,const OT::SubstLookup & lookup,const hb_ot_layout_lookup_accelerator_t & accel)1226 hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
1227 const OT::SubstLookup &lookup,
1228 const hb_ot_layout_lookup_accelerator_t &accel)
1229 {
1230 apply_string<GSUBProxy> (c, lookup, accel);
1231 }
1232