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.hh"
32#include "hb-ot-layout.hh"
33#include "hb-ot-face.hh"
34#include "hb-ot-map.hh"
35#include "hb-map.hh"
36
37#include "hb-ot-layout-gdef-table.hh"
38#include "hb-ot-layout-gsub-table.hh"
39#include "hb-ot-layout-gpos-table.hh"
40
41// Just so we compile them; unused otherwise:
42#include "hb-ot-layout-base-table.hh"
43#include "hb-ot-layout-jstf-table.hh"
44#include "hb-ot-color-colr-table.hh"
45#include "hb-ot-color-cpal-table.hh"
46#include "hb-ot-color-sbix-table.hh"
47#include "hb-ot-color-svg-table.hh"
48#include "hb-ot-name-table.hh"
49
50
51// static inline const OT::BASE&
52// _get_base (hb_face_t *face)
53// {
54// if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::BASE);
55// hb_ot_face_data_t *data = hb_ot_face_data (face);
56// return *(data->base.get ());
57// }
58
59const OT::GDEF& _get_gdef (hb_face_t *face)
60{
61 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GDEF);
62 return *hb_ot_face_data (face)->GDEF->table;
63}
64static hb_blob_t * _get_gsub_blob (hb_face_t *face)
65{
66 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return hb_blob_get_empty ();
67 return hb_ot_face_data (face)->GSUB->blob;
68}
69static inline const OT::GSUB& _get_gsub (hb_face_t *face)
70{
71 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GSUB);
72 return *hb_ot_face_data (face)->GSUB->table;
73}
74const OT::GSUB& _get_gsub_relaxed (hb_face_t *face)
75{
76 return *hb_ot_face_data (face)->GSUB.get_relaxed ()->table;
77}
78static hb_blob_t * _get_gpos_blob (hb_face_t *face)
79{
80 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return hb_blob_get_empty ();
81 return hb_ot_face_data (face)->GPOS->blob;
82}
83static inline const OT::GPOS& _get_gpos (hb_face_t *face)
84{
85 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GPOS);
86 return *hb_ot_face_data (face)->GPOS->table;
87}
88const OT::GPOS& _get_gpos_relaxed (hb_face_t *face)
89{
90 return *hb_ot_face_data (face)->GPOS.get_relaxed ()->table;
91}
92
93
94/*
95 * GDEF
96 */
97
98static bool
99_hb_ot_blacklist_gdef (unsigned int gdef_len,
100 unsigned int gsub_len,
101 unsigned int gpos_len)
102{
103 /* The ugly business of blacklisting individual fonts' tables happen here!
104 * See this thread for why we finally had to bend in and do this:
105 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
106 *
107 * In certain versions of Times New Roman Italic and Bold Italic,
108 * ASCII double quotation mark U+0022 has wrong glyph class 3 (mark)
109 * in GDEF. Many versions of Tahoma have bad GDEF tables that
110 * incorrectly classify some spacing marks such as certain IPA
111 * symbols as glyph class 3. So do older versions of Microsoft
112 * Himalaya, and the version of Cantarell shipped by Ubuntu 16.04.
113 *
114 * Nuke the GDEF tables of to avoid unwanted width-zeroing.
115 *
116 * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925
117 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693
118 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875
119 */
120#define ENCODE(x,y,z) ((int64_t) (x) << 32 | (int64_t) (y) << 16 | (z))
121 switch ENCODE(gdef_len, gsub_len, gpos_len)
122 {
123 /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */
124 case ENCODE (442, 2874, 42038):
125 /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */
126 case ENCODE (430, 2874, 40662):
127 /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */
128 case ENCODE (442, 2874, 39116):
129 /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */
130 case ENCODE (430, 2874, 39374):
131 /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */
132 case ENCODE (490, 3046, 41638):
133 /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */
134 case ENCODE (478, 3046, 41902):
135 /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */
136 case ENCODE (898, 12554, 46470):
137 /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */
138 case ENCODE (910, 12566, 47732):
139 /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */
140 case ENCODE (928, 23298, 59332):
141 /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */
142 case ENCODE (940, 23310, 60732):
143 /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
144 case ENCODE (964, 23836, 60072):
145 /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
146 case ENCODE (976, 23832, 61456):
147 /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */
148 case ENCODE (994, 24474, 60336):
149 /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */
150 case ENCODE (1006, 24470, 61740):
151 /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
152 case ENCODE (1006, 24576, 61346):
153 /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
154 case ENCODE (1018, 24572, 62828):
155 /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */
156 case ENCODE (1006, 24576, 61352):
157 /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */
158 case ENCODE (1018, 24572, 62834):
159 /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */
160 case ENCODE (832, 7324, 47162):
161 /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */
162 case ENCODE (844, 7302, 45474):
163 /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */
164 case ENCODE (180, 13054, 7254):
165 /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */
166 case ENCODE (192, 12638, 7254):
167 /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */
168 case ENCODE (192, 12690, 7254):
169 /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */
170 /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */
171 case ENCODE (188, 248, 3852):
172 /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */
173 /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */
174 case ENCODE (188, 264, 3426):
175 /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */
176 case ENCODE (1058, 47032, 11818):
177 /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/
178 case ENCODE (1046, 47030, 12600):
179 /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */
180 case ENCODE (1058, 71796, 16770):
181 /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */
182 case ENCODE (1046, 71790, 17862):
183 /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */
184 case ENCODE (1046, 71788, 17112):
185 /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */
186 case ENCODE (1058, 71794, 17514):
187 /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */
188 case ENCODE (1330, 109904, 57938):
189 /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */
190 case ENCODE (1330, 109904, 58972):
191 /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf
192 * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */
193 case ENCODE (1004, 59092, 14836):
194 return true;
195#undef ENCODE
196 }
197 return false;
198}
199
200inline void
201OT::GDEF::accelerator_t::init (hb_face_t *face)
202{
203 this->blob = hb_sanitize_context_t().reference_table<GDEF> (face);
204
205 if (unlikely (_hb_ot_blacklist_gdef (this->blob->length,
206 _get_gsub_blob (face)->length,
207 _get_gpos_blob (face)->length)))
208 {
209 hb_blob_destroy (this->blob);
210 this->blob = hb_blob_get_empty ();
211 }
212
213 table = this->blob->as<GDEF> ();
214}
215
216static void
217_hb_ot_layout_set_glyph_props (hb_font_t *font,
218 hb_buffer_t *buffer)
219{
220 _hb_buffer_assert_gsubgpos_vars (buffer);
221
222 const OT::GDEF &gdef = _get_gdef (font->face);
223 unsigned int count = buffer->len;
224 for (unsigned int i = 0; i < count; i++)
225 {
226 _hb_glyph_info_set_glyph_props (&buffer->info[i], gdef.get_glyph_props (buffer->info[i].codepoint));
227 _hb_glyph_info_clear_lig_props (&buffer->info[i]);
228 buffer->info[i].syllable() = 0;
229 }
230}
231
232/* Public API */
233
234hb_bool_t
235hb_ot_layout_has_glyph_classes (hb_face_t *face)
236{
237 return _get_gdef (face).has_glyph_classes ();
238}
239
240/**
241 * hb_ot_layout_get_glyph_class:
242 *
243 * Since: 0.9.7
244 **/
245hb_ot_layout_glyph_class_t
246hb_ot_layout_get_glyph_class (hb_face_t *face,
247 hb_codepoint_t glyph)
248{
249 return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph);
250}
251
252/**
253 * hb_ot_layout_get_glyphs_in_class:
254 *
255 * Since: 0.9.7
256 **/
257void
258hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
259 hb_ot_layout_glyph_class_t klass,
260 hb_set_t *glyphs /* OUT */)
261{
262 return _get_gdef (face).get_glyphs_in_class (klass, glyphs);
263}
264
265unsigned int
266hb_ot_layout_get_attach_points (hb_face_t *face,
267 hb_codepoint_t glyph,
268 unsigned int start_offset,
269 unsigned int *point_count /* IN/OUT */,
270 unsigned int *point_array /* OUT */)
271{
272 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
273}
274
275unsigned int
276hb_ot_layout_get_ligature_carets (hb_font_t *font,
277 hb_direction_t direction,
278 hb_codepoint_t glyph,
279 unsigned int start_offset,
280 unsigned int *caret_count /* IN/OUT */,
281 hb_position_t *caret_array /* OUT */)
282{
283 return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
284}
285
286
287/*
288 * GSUB/GPOS
289 */
290
291static const OT::GSUBGPOS&
292get_gsubgpos_table (hb_face_t *face,
293 hb_tag_t table_tag)
294{
295 switch (table_tag) {
296 case HB_OT_TAG_GSUB: return _get_gsub (face);
297 case HB_OT_TAG_GPOS: return _get_gpos (face);
298 default: return Null(OT::GSUBGPOS);
299 }
300}
301
302
303unsigned int
304hb_ot_layout_table_get_script_tags (hb_face_t *face,
305 hb_tag_t table_tag,
306 unsigned int start_offset,
307 unsigned int *script_count /* IN/OUT */,
308 hb_tag_t *script_tags /* OUT */)
309{
310 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
311
312 return g.get_script_tags (start_offset, script_count, script_tags);
313}
314
315#define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
316
317hb_bool_t
318hb_ot_layout_table_find_script (hb_face_t *face,
319 hb_tag_t table_tag,
320 hb_tag_t script_tag,
321 unsigned int *script_index)
322{
323 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX), "");
324 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
325
326 if (g.find_script_index (script_tag, script_index))
327 return true;
328
329 /* try finding 'DFLT' */
330 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
331 return false;
332
333 /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
334 * including many versions of DejaVu Sans Mono! */
335 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
336 return false;
337
338 /* try with 'latn'; some old fonts put their features there even though
339 they're really trying to support Thai, for example :( */
340 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index))
341 return false;
342
343 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
344 return false;
345}
346
347hb_bool_t
348hb_ot_layout_table_choose_script (hb_face_t *face,
349 hb_tag_t table_tag,
350 const hb_tag_t *script_tags,
351 unsigned int *script_index,
352 hb_tag_t *chosen_script)
353{
354 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX), "");
355 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
356
357 while (*script_tags)
358 {
359 if (g.find_script_index (*script_tags, script_index)) {
360 if (chosen_script)
361 *chosen_script = *script_tags;
362 return true;
363 }
364 script_tags++;
365 }
366
367 /* try finding 'DFLT' */
368 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
369 if (chosen_script)
370 *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
371 return false;
372 }
373
374 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
375 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
376 if (chosen_script)
377 *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
378 return false;
379 }
380
381 /* try with 'latn'; some old fonts put their features there even though
382 they're really trying to support Thai, for example :( */
383 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
384 if (chosen_script)
385 *chosen_script = HB_OT_TAG_LATIN_SCRIPT;
386 return false;
387 }
388
389 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
390 if (chosen_script)
391 *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
392 return false;
393}
394
395unsigned int
396hb_ot_layout_table_get_feature_tags (hb_face_t *face,
397 hb_tag_t table_tag,
398 unsigned int start_offset,
399 unsigned int *feature_count /* IN/OUT */,
400 hb_tag_t *feature_tags /* OUT */)
401{
402 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
403
404 return g.get_feature_tags (start_offset, feature_count, feature_tags);
405}
406
407hb_bool_t
408hb_ot_layout_table_find_feature (hb_face_t *face,
409 hb_tag_t table_tag,
410 hb_tag_t feature_tag,
411 unsigned int *feature_index)
412{
413 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX), "");
414 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
415
416 unsigned int num_features = g.get_feature_count ();
417 for (unsigned int i = 0; i < num_features; i++)
418 {
419 if (feature_tag == g.get_feature_tag (i)) {
420 if (feature_index) *feature_index = i;
421 return true;
422 }
423 }
424
425 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
426 return false;
427}
428
429
430unsigned int
431hb_ot_layout_script_get_language_tags (hb_face_t *face,
432 hb_tag_t table_tag,
433 unsigned int script_index,
434 unsigned int start_offset,
435 unsigned int *language_count /* IN/OUT */,
436 hb_tag_t *language_tags /* OUT */)
437{
438 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
439
440 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
441}
442
443hb_bool_t
444hb_ot_layout_script_find_language (hb_face_t *face,
445 hb_tag_t table_tag,
446 unsigned int script_index,
447 hb_tag_t language_tag,
448 unsigned int *language_index)
449{
450 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX), "");
451 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
452
453 if (s.find_lang_sys_index (language_tag, language_index))
454 return true;
455
456 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
457 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
458 return false;
459
460 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
461 return false;
462}
463
464hb_bool_t
465hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
466 hb_tag_t table_tag,
467 unsigned int script_index,
468 unsigned int language_index,
469 unsigned int *feature_index)
470{
471 return hb_ot_layout_language_get_required_feature (face,
472 table_tag,
473 script_index,
474 language_index,
475 feature_index,
476 nullptr);
477}
478
479/**
480 * hb_ot_layout_language_get_required_feature:
481 *
482 * Since: 0.9.30
483 **/
484hb_bool_t
485hb_ot_layout_language_get_required_feature (hb_face_t *face,
486 hb_tag_t table_tag,
487 unsigned int script_index,
488 unsigned int language_index,
489 unsigned int *feature_index,
490 hb_tag_t *feature_tag)
491{
492 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
493 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
494
495 unsigned int index = l.get_required_feature_index ();
496 if (feature_index) *feature_index = index;
497 if (feature_tag) *feature_tag = g.get_feature_tag (index);
498
499 return l.has_required_feature ();
500}
501
502static void
503_hb_ot_layout_language_add_feature_indexes_to (hb_face_t *face,
504 hb_tag_t table_tag,
505 unsigned int script_index,
506 unsigned int language_index,
507 hb_set_t *feature_indexes /* OUT */)
508{
509 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
510 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
511 l.add_feature_indexes_to (feature_indexes);
512}
513
514
515unsigned int
516hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
517 hb_tag_t table_tag,
518 unsigned int script_index,
519 unsigned int language_index,
520 unsigned int start_offset,
521 unsigned int *feature_count /* IN/OUT */,
522 unsigned int *feature_indexes /* OUT */)
523{
524 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
525 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
526
527 return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
528}
529
530unsigned int
531hb_ot_layout_language_get_feature_tags (hb_face_t *face,
532 hb_tag_t table_tag,
533 unsigned int script_index,
534 unsigned int language_index,
535 unsigned int start_offset,
536 unsigned int *feature_count /* IN/OUT */,
537 hb_tag_t *feature_tags /* OUT */)
538{
539 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
540 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
541
542 static_assert ((sizeof (unsigned int) == sizeof (hb_tag_t)), "");
543 unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
544
545 if (feature_tags) {
546 unsigned int count = *feature_count;
547 for (unsigned int i = 0; i < count; i++)
548 feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
549 }
550
551 return ret;
552}
553
554
555hb_bool_t
556hb_ot_layout_language_find_feature (hb_face_t *face,
557 hb_tag_t table_tag,
558 unsigned int script_index,
559 unsigned int language_index,
560 hb_tag_t feature_tag,
561 unsigned int *feature_index)
562{
563 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX), "");
564 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
565 const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
566
567 unsigned int num_features = l.get_feature_count ();
568 for (unsigned int i = 0; i < num_features; i++) {
569 unsigned int f_index = l.get_feature_index (i);
570
571 if (feature_tag == g.get_feature_tag (f_index)) {
572 if (feature_index) *feature_index = f_index;
573 return true;
574 }
575 }
576
577 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
578 return false;
579}
580
581/**
582 * hb_ot_layout_feature_get_lookups:
583 *
584 * Since: 0.9.7
585 **/
586unsigned int
587hb_ot_layout_feature_get_lookups (hb_face_t *face,
588 hb_tag_t table_tag,
589 unsigned int feature_index,
590 unsigned int start_offset,
591 unsigned int *lookup_count /* IN/OUT */,
592 unsigned int *lookup_indexes /* OUT */)
593{
594 return hb_ot_layout_feature_with_variations_get_lookups (face,
595 table_tag,
596 feature_index,
597 HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
598 start_offset,
599 lookup_count,
600 lookup_indexes);
601}
602
603/**
604 * hb_ot_layout_table_get_lookup_count:
605 *
606 * Since: 0.9.22
607 **/
608unsigned int
609hb_ot_layout_table_get_lookup_count (hb_face_t *face,
610 hb_tag_t table_tag)
611{
612 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return 0;
613 switch (table_tag)
614 {
615 case HB_OT_TAG_GSUB:
616 {
617 return hb_ot_face_data (face)->GSUB->lookup_count;
618 }
619 case HB_OT_TAG_GPOS:
620 {
621 return hb_ot_face_data (face)->GPOS->lookup_count;
622 }
623 }
624 return 0;
625}
626
627static void
628_hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
629 hb_tag_t table_tag,
630 unsigned int feature_index,
631 hb_set_t *lookup_indexes /* OUT */)
632{
633 unsigned int lookup_indices[32];
634 unsigned int offset, len;
635
636 offset = 0;
637 do {
638 len = ARRAY_LENGTH (lookup_indices);
639 hb_ot_layout_feature_get_lookups (face,
640 table_tag,
641 feature_index,
642 offset, &len,
643 lookup_indices);
644
645 for (unsigned int i = 0; i < len; i++)
646 lookup_indexes->add (lookup_indices[i]);
647
648 offset += len;
649 } while (len == ARRAY_LENGTH (lookup_indices));
650}
651
652static void
653_hb_ot_layout_collect_features_features (hb_face_t *face,
654 hb_tag_t table_tag,
655 unsigned int script_index,
656 unsigned int language_index,
657 const hb_tag_t *features,
658 hb_set_t *feature_indexes /* OUT */)
659{
660 if (!features)
661 {
662 unsigned int required_feature_index;
663 if (hb_ot_layout_language_get_required_feature (face,
664 table_tag,
665 script_index,
666 language_index,
667 &required_feature_index,
668 nullptr))
669 feature_indexes->add (required_feature_index);
670
671 /* All features */
672 _hb_ot_layout_language_add_feature_indexes_to (face,
673 table_tag,
674 script_index,
675 language_index,
676 feature_indexes);
677 }
678 else
679 {
680 for (; *features; features++)
681 {
682 unsigned int feature_index;
683 if (hb_ot_layout_language_find_feature (face,
684 table_tag,
685 script_index,
686 language_index,
687 *features,
688 &feature_index))
689 feature_indexes->add (feature_index);
690 }
691 }
692}
693
694static void
695_hb_ot_layout_collect_features_languages (hb_face_t *face,
696 hb_tag_t table_tag,
697 unsigned int script_index,
698 const hb_tag_t *languages,
699 const hb_tag_t *features,
700 hb_set_t *feature_indexes /* OUT */)
701{
702 _hb_ot_layout_collect_features_features (face,
703 table_tag,
704 script_index,
705 HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
706 features,
707 feature_indexes);
708
709 if (!languages)
710 {
711 /* All languages */
712 unsigned int count = hb_ot_layout_script_get_language_tags (face,
713 table_tag,
714 script_index,
715 0, nullptr, nullptr);
716 for (unsigned int language_index = 0; language_index < count; language_index++)
717 _hb_ot_layout_collect_features_features (face,
718 table_tag,
719 script_index,
720 language_index,
721 features,
722 feature_indexes);
723 }
724 else
725 {
726 for (; *languages; languages++)
727 {
728 unsigned int language_index;
729 if (hb_ot_layout_script_find_language (face,
730 table_tag,
731 script_index,
732 *languages,
733 &language_index))
734 _hb_ot_layout_collect_features_features (face,
735 table_tag,
736 script_index,
737 language_index,
738 features,
739 feature_indexes);
740 }
741 }
742}
743
744/**
745 * hb_ot_layout_collect_features:
746 *
747 * Since: 1.8.5
748 **/
749void
750hb_ot_layout_collect_features (hb_face_t *face,
751 hb_tag_t table_tag,
752 const hb_tag_t *scripts,
753 const hb_tag_t *languages,
754 const hb_tag_t *features,
755 hb_set_t *feature_indexes /* OUT */)
756{
757 if (!scripts)
758 {
759 /* All scripts */
760 unsigned int count = hb_ot_layout_table_get_script_tags (face,
761 table_tag,
762 0, nullptr, nullptr);
763 for (unsigned int script_index = 0; script_index < count; script_index++)
764 _hb_ot_layout_collect_features_languages (face,
765 table_tag,
766 script_index,
767 languages,
768 features,
769 feature_indexes);
770 }
771 else
772 {
773 for (; *scripts; scripts++)
774 {
775 unsigned int script_index;
776 if (hb_ot_layout_table_find_script (face,
777 table_tag,
778 *scripts,
779 &script_index))
780 _hb_ot_layout_collect_features_languages (face,
781 table_tag,
782 script_index,
783 languages,
784 features,
785 feature_indexes);
786 }
787 }
788}
789
790/**
791 * hb_ot_layout_collect_lookups:
792 *
793 * Since: 0.9.8
794 **/
795void
796hb_ot_layout_collect_lookups (hb_face_t *face,
797 hb_tag_t table_tag,
798 const hb_tag_t *scripts,
799 const hb_tag_t *languages,
800 const hb_tag_t *features,
801 hb_set_t *lookup_indexes /* OUT */)
802{
803 hb_auto_t<hb_set_t> feature_indexes;
804 hb_ot_layout_collect_features (face, table_tag, scripts, languages, features, &feature_indexes);
805 for (hb_codepoint_t feature_index = HB_SET_VALUE_INVALID; hb_set_next (&feature_indexes, &feature_index);)
806 _hb_ot_layout_collect_lookups_lookups (face, table_tag, feature_index, lookup_indexes);
807}
808
809/**
810 * hb_ot_layout_lookup_collect_glyphs:
811 *
812 * Since: 0.9.7
813 **/
814void
815hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
816 hb_tag_t table_tag,
817 unsigned int lookup_index,
818 hb_set_t *glyphs_before, /* OUT. May be nullptr */
819 hb_set_t *glyphs_input, /* OUT. May be nullptr */
820 hb_set_t *glyphs_after, /* OUT. May be nullptr */
821 hb_set_t *glyphs_output /* OUT. May be nullptr */)
822{
823 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
824
825 OT::hb_collect_glyphs_context_t c (face,
826 glyphs_before,
827 glyphs_input,
828 glyphs_after,
829 glyphs_output);
830
831 switch (table_tag)
832 {
833 case HB_OT_TAG_GSUB:
834 {
835 const OT::SubstLookup& l = hb_ot_face_data (face)->GSUB->table->get_lookup (lookup_index);
836 l.collect_glyphs (&c);
837 return;
838 }
839 case HB_OT_TAG_GPOS:
840 {
841 const OT::PosLookup& l = hb_ot_face_data (face)->GPOS->table->get_lookup (lookup_index);
842 l.collect_glyphs (&c);
843 return;
844 }
845 }
846}
847
848
849/* Variations support */
850
851hb_bool_t
852hb_ot_layout_table_find_feature_variations (hb_face_t *face,
853 hb_tag_t table_tag,
854 const int *coords,
855 unsigned int num_coords,
856 unsigned int *variations_index /* out */)
857{
858 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
859
860 return g.find_variations_index (coords, num_coords, variations_index);
861}
862
863unsigned int
864hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face,
865 hb_tag_t table_tag,
866 unsigned int feature_index,
867 unsigned int variations_index,
868 unsigned int start_offset,
869 unsigned int *lookup_count /* IN/OUT */,
870 unsigned int *lookup_indexes /* OUT */)
871{
872 static_assert ((OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX), "");
873 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
874
875 const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
876
877 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
878}
879
880
881/*
882 * OT::GSUB
883 */
884
885hb_bool_t
886hb_ot_layout_has_substitution (hb_face_t *face)
887{
888 return _get_gsub (face).has_data ();
889}
890
891/**
892 * hb_ot_layout_lookup_would_substitute:
893 *
894 * Since: 0.9.7
895 **/
896hb_bool_t
897hb_ot_layout_lookup_would_substitute (hb_face_t *face,
898 unsigned int lookup_index,
899 const hb_codepoint_t *glyphs,
900 unsigned int glyphs_length,
901 hb_bool_t zero_context)
902{
903 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false;
904 return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context);
905}
906
907hb_bool_t
908hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
909 unsigned int lookup_index,
910 const hb_codepoint_t *glyphs,
911 unsigned int glyphs_length,
912 hb_bool_t zero_context)
913{
914 if (unlikely (lookup_index >= hb_ot_face_data (face)->GSUB->lookup_count)) return false;
915 OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
916
917 const OT::SubstLookup& l = hb_ot_face_data (face)->GSUB->table->get_lookup (lookup_index);
918
919 return l.would_apply (&c, &hb_ot_face_data (face)->GSUB->accels[lookup_index]);
920}
921
922void
923hb_ot_layout_substitute_start (hb_font_t *font,
924 hb_buffer_t *buffer)
925{
926_hb_ot_layout_set_glyph_props (font, buffer);
927}
928
929/**
930 * hb_ot_layout_lookup_substitute_closure:
931 *
932 * Since: 0.9.7
933 **/
934void
935hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
936 unsigned int lookup_index,
937 hb_set_t *glyphs)
938{
939 hb_auto_t<hb_map_t> done_lookups;
940 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
941
942 const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
943
944 l.closure (&c, lookup_index);
945}
946
947/**
948 * hb_ot_layout_lookups_substitute_closure:
949 *
950 * Compute the transitive closure of glyphs needed for all of the
951 * provided lookups.
952 *
953 * Since: 1.8.1
954 **/
955void
956hb_ot_layout_lookups_substitute_closure (hb_face_t *face,
957 const hb_set_t *lookups,
958 hb_set_t *glyphs)
959{
960 hb_auto_t<hb_map_t> done_lookups;
961 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
962 const OT::GSUB& gsub = _get_gsub (face);
963
964 unsigned int iteration_count = 0;
965 unsigned int glyphs_length;
966 do
967 {
968 glyphs_length = glyphs->get_population ();
969 if (lookups != nullptr)
970 {
971 for (hb_codepoint_t lookup_index = HB_SET_VALUE_INVALID; hb_set_next (lookups, &lookup_index);)
972 gsub.get_lookup (lookup_index).closure (&c, lookup_index);
973 }
974 else
975 {
976 for (unsigned int i = 0; i < gsub.get_lookup_count (); i++)
977 gsub.get_lookup (i).closure (&c, i);
978 }
979 iteration_count++;
980 } while (iteration_count <= HB_CLOSURE_MAX_STAGES
981 && glyphs_length != glyphs->get_population ());
982}
983
984/*
985 * OT::GPOS
986 */
987
988hb_bool_t
989hb_ot_layout_has_positioning (hb_face_t *face)
990{
991 return _get_gpos (face).has_data ();
992}
993
994void
995hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
996{
997 OT::GPOS::position_start (font, buffer);
998}
999
1000void
1001hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
1002{
1003 OT::GPOS::position_finish_advances (font, buffer);
1004}
1005
1006void
1007hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
1008{
1009 OT::GPOS::position_finish_offsets (font, buffer);
1010}
1011
1012/**
1013 * hb_ot_layout_get_size_params:
1014 *
1015 * Since: 0.9.10
1016 **/
1017hb_bool_t
1018hb_ot_layout_get_size_params (hb_face_t *face,
1019 unsigned int *design_size, /* OUT. May be nullptr */
1020 unsigned int *subfamily_id, /* OUT. May be nullptr */
1021 unsigned int *subfamily_name_id, /* OUT. May be nullptr */
1022 unsigned int *range_start, /* OUT. May be nullptr */
1023 unsigned int *range_end /* OUT. May be nullptr */)
1024{
1025 const OT::GPOS &gpos = _get_gpos (face);
1026 const hb_tag_t tag = HB_TAG ('s','i','z','e');
1027
1028 unsigned int num_features = gpos.get_feature_count ();
1029 for (unsigned int i = 0; i < num_features; i++)
1030 {
1031 if (tag == gpos.get_feature_tag (i))
1032 {
1033 const OT::Feature &f = gpos.get_feature (i);
1034 const OT::FeatureParamsSize &params = f.get_feature_params ().get_size_params (tag);
1035
1036 if (params.designSize)
1037 {
1038#define PARAM(a, A) if (a) *a = params.A
1039 PARAM (design_size, designSize);
1040 PARAM (subfamily_id, subfamilyID);
1041 PARAM (subfamily_name_id, subfamilyNameID);
1042 PARAM (range_start, rangeStart);
1043 PARAM (range_end, rangeEnd);
1044#undef PARAM
1045
1046 return true;
1047 }
1048 }
1049 }
1050
1051#define PARAM(a, A) if (a) *a = 0
1052 PARAM (design_size, designSize);
1053 PARAM (subfamily_id, subfamilyID);
1054 PARAM (subfamily_name_id, subfamilyNameID);
1055 PARAM (range_start, rangeStart);
1056 PARAM (range_end, rangeEnd);
1057#undef PARAM
1058
1059 return false;
1060}
1061
1062
1063/*
1064 * Parts of different types are implemented here such that they have direct
1065 * access to GSUB/GPOS lookups.
1066 */
1067
1068
1069struct GSUBProxy
1070{
1071 enum { table_index = 0 };
1072 static const bool inplace = false;
1073 typedef OT::SubstLookup Lookup;
1074
1075 GSUBProxy (hb_face_t *face) :
1076 table (*hb_ot_face_data (face)->GSUB->table),
1077 accels (hb_ot_face_data (face)->GSUB->accels) {}
1078
1079 const OT::GSUB &table;
1080 const hb_ot_layout_lookup_accelerator_t *accels;
1081};
1082
1083struct GPOSProxy
1084{
1085 enum { table_index = 1 };
1086 static const bool inplace = true;
1087 typedef OT::PosLookup Lookup;
1088
1089 GPOSProxy (hb_face_t *face) :
1090 table (*hb_ot_face_data (face)->GPOS->table),
1091 accels (hb_ot_face_data (face)->GPOS->accels) {}
1092
1093 const OT::GPOS &table;
1094 const hb_ot_layout_lookup_accelerator_t *accels;
1095};
1096
1097
1098struct hb_get_subtables_context_t :
1099 hb_dispatch_context_t<hb_get_subtables_context_t, hb_void_t, HB_DEBUG_APPLY>
1100{
1101 template <typename Type>
1102 static inline bool apply_to (const void *obj, OT::hb_ot_apply_context_t *c)
1103 {
1104 const Type *typed_obj = (const Type *) obj;
1105 return typed_obj->apply (c);
1106 }
1107
1108 typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_ot_apply_context_t *c);
1109
1110 struct hb_applicable_t
1111 {
1112 inline void init (const void *obj_, hb_apply_func_t apply_func_)
1113 {
1114 obj = obj_;
1115 apply_func = apply_func_;
1116 }
1117
1118 inline bool apply (OT::hb_ot_apply_context_t *c) const { return apply_func (obj, c); }
1119
1120 private:
1121 const void *obj;
1122 hb_apply_func_t apply_func;
1123 };
1124
1125 typedef hb_auto_t<hb_vector_t<hb_applicable_t> > array_t;
1126
1127 /* Dispatch interface. */
1128 inline const char *get_name (void) { return "GET_SUBTABLES"; }
1129 template <typename T>
1130 inline return_t dispatch (const T &obj)
1131 {
1132 hb_applicable_t *entry = array.push();
1133 entry->init (&obj, apply_to<T>);
1134 return HB_VOID;
1135 }
1136 static return_t default_return_value (void) { return HB_VOID; }
1137 bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
1138
1139 hb_get_subtables_context_t (array_t &array_) :
1140 array (array_),
1141 debug_depth (0) {}
1142
1143 array_t &array;
1144 unsigned int debug_depth;
1145};
1146
1147static inline bool
1148apply_forward (OT::hb_ot_apply_context_t *c,
1149 const hb_ot_layout_lookup_accelerator_t &accel,
1150 const hb_get_subtables_context_t::array_t &subtables)
1151{
1152 bool ret = false;
1153 hb_buffer_t *buffer = c->buffer;
1154 while (buffer->idx < buffer->len && buffer->successful)
1155 {
1156 bool applied = false;
1157 if (accel.may_have (buffer->cur().codepoint) &&
1158 (buffer->cur().mask & c->lookup_mask) &&
1159 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1160 {
1161 for (unsigned int i = 0; i < subtables.len; i++)
1162 if (subtables[i].apply (c))
1163 {
1164 applied = true;
1165 break;
1166 }
1167 }
1168
1169 if (applied)
1170 ret = true;
1171 else
1172 buffer->next_glyph ();
1173 }
1174 return ret;
1175}
1176
1177static inline bool
1178apply_backward (OT::hb_ot_apply_context_t *c,
1179 const hb_ot_layout_lookup_accelerator_t &accel,
1180 const hb_get_subtables_context_t::array_t &subtables)
1181{
1182 bool ret = false;
1183 hb_buffer_t *buffer = c->buffer;
1184 do
1185 {
1186 if (accel.may_have (buffer->cur().codepoint) &&
1187 (buffer->cur().mask & c->lookup_mask) &&
1188 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1189 {
1190 for (unsigned int i = 0; i < subtables.len; i++)
1191 if (subtables[i].apply (c))
1192 {
1193 ret = true;
1194 break;
1195 }
1196 }
1197 /* The reverse lookup doesn't "advance" cursor (for good reason). */
1198 buffer->idx--;
1199
1200 }
1201 while ((int) buffer->idx >= 0);
1202 return ret;
1203}
1204
1205template <typename Proxy>
1206static inline void
1207apply_string (OT::hb_ot_apply_context_t *c,
1208 const typename Proxy::Lookup &lookup,
1209 const hb_ot_layout_lookup_accelerator_t &accel)
1210{
1211 hb_buffer_t *buffer = c->buffer;
1212
1213 if (unlikely (!buffer->len || !c->lookup_mask))
1214 return;
1215
1216 c->set_lookup_props (lookup.get_props ());
1217
1218 hb_get_subtables_context_t::array_t subtables;
1219 hb_get_subtables_context_t c_get_subtables (subtables);
1220 lookup.dispatch (&c_get_subtables);
1221
1222 if (likely (!lookup.is_reverse ()))
1223 {
1224 /* in/out forward substitution/positioning */
1225 if (Proxy::table_index == 0)
1226 buffer->clear_output ();
1227 buffer->idx = 0;
1228
1229 bool ret;
1230 ret = apply_forward (c, accel, subtables);
1231 if (ret)
1232 {
1233 if (!Proxy::inplace)
1234 buffer->swap_buffers ();
1235 else
1236 assert (!buffer->has_separate_output ());
1237 }
1238 }
1239 else
1240 {
1241 /* in-place backward substitution/positioning */
1242 if (Proxy::table_index == 0)
1243 buffer->remove_output ();
1244 buffer->idx = buffer->len - 1;
1245
1246 apply_backward (c, accel, subtables);
1247 }
1248}
1249
1250template <typename Proxy>
1251inline void hb_ot_map_t::apply (const Proxy &proxy,
1252 const hb_ot_shape_plan_t *plan,
1253 hb_font_t *font,
1254 hb_buffer_t *buffer) const
1255{
1256 const unsigned int table_index = proxy.table_index;
1257 unsigned int i = 0;
1258 OT::hb_ot_apply_context_t c (table_index, font, buffer);
1259 c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
1260
1261 for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) {
1262 const stage_map_t *stage = &stages[table_index][stage_index];
1263 for (; i < stage->last_lookup; i++)
1264 {
1265 unsigned int lookup_index = lookups[table_index][i].index;
1266 if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
1267 c.set_lookup_index (lookup_index);
1268 c.set_lookup_mask (lookups[table_index][i].mask);
1269 c.set_auto_zwj (lookups[table_index][i].auto_zwj);
1270 c.set_auto_zwnj (lookups[table_index][i].auto_zwnj);
1271 apply_string<Proxy> (&c,
1272 proxy.table.get_lookup (lookup_index),
1273 proxy.accels[lookup_index]);
1274 (void) buffer->message (font, "end lookup %d", lookup_index);
1275 }
1276
1277 if (stage->pause_func)
1278 {
1279 buffer->clear_output ();
1280 stage->pause_func (plan, font, buffer);
1281 }
1282 }
1283}
1284
1285void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1286{
1287 GSUBProxy proxy (font->face);
1288 apply (proxy, plan, font, buffer);
1289}
1290
1291void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1292{
1293 GPOSProxy proxy (font->face);
1294 apply (proxy, plan, font, buffer);
1295}
1296
1297void
1298hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
1299 const OT::SubstLookup &lookup,
1300 const hb_ot_layout_lookup_accelerator_t &accel)
1301{
1302 apply_string<GSUBProxy> (c, lookup, accel);
1303}
1304
1305
1306
1307
1308/*
1309 * OT::BASE
1310 */
1311
1312// /**
1313// * hb_ot_base_has_data:
1314// * @face: #hb_face_t to test
1315// *
1316// * This function allows to verify the presence of an OpenType BASE table on the
1317// * face.
1318// *
1319// * Return value: true if face has a BASE table, false otherwise
1320// *
1321// * Since: XXX
1322// **/
1323// hb_bool_t
1324// hb_ot_base_has_data (hb_face_t *face)
1325// {
1326// return _get_base (face).has_data ();
1327// }
1328