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 #include "hb-ot-map-private.hh"
34
35 #include "hb-ot-layout-gdef-table.hh"
36 #include "hb-ot-layout-gsub-table.hh"
37 #include "hb-ot-layout-gpos-table.hh"
38
39 // Just so we compile them; unused otherwise:
40 #include "hb-ot-layout-base-table.hh"
41 #include "hb-ot-layout-jstf-table.hh"
42 #include "hb-ot-color-colr-table.hh"
43 #include "hb-ot-color-cpal-table.hh"
44 #include "hb-ot-color-sbix-table.hh"
45 #include "hb-ot-color-svg-table.hh"
46 #include "hb-ot-name-table.hh"
47 #include "hb-map-private.hh"
48
49
50 hb_ot_layout_t *
51 _hb_ot_layout_create (hb_face_t *face)
52 {
53 hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
54 if (unlikely (!layout))
55 return nullptr;
56
57 layout->gdef_blob = OT::Sanitizer<OT::GDEF>().sanitize (face->reference_table (HB_OT_TAG_GDEF));
58 layout->gdef = layout->gdef_blob->as<OT::GDEF> ();
59
60 layout->gsub_blob = OT::Sanitizer<OT::GSUB>().sanitize (face->reference_table (HB_OT_TAG_GSUB));
61 layout->gsub = layout->gsub_blob->as<OT::GSUB> ();
62
63 layout->gpos_blob = OT::Sanitizer<OT::GPOS>().sanitize (face->reference_table (HB_OT_TAG_GPOS));
64 layout->gpos = layout->gpos_blob->as<OT::GPOS> ();
65
66 layout->math.init (face);
67 layout->fvar.init (face);
68 layout->avar.init (face);
69
70 {
71 /*
72 * The ugly business of blacklisting individual fonts' tables happen here!
73 * See this thread for why we finally had to bend in and do this:
74 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
75 */
76 unsigned int gdef_len = layout->gdef_blob->length;
77 unsigned int gsub_len = layout->gsub_blob->length;
78 unsigned int gpos_len = layout->gpos_blob->length;
79 if (0
80 /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */
81 || (442 == gdef_len && 42038 == gpos_len && 2874 == gsub_len)
82 /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */
83 || (430 == gdef_len && 40662 == gpos_len && 2874 == gsub_len)
84 /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */
85 || (442 == gdef_len && 39116 == gpos_len && 2874 == gsub_len)
86 /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */
87 || (430 == gdef_len && 39374 == gpos_len && 2874 == gsub_len)
88 /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */
89 || (490 == gdef_len && 41638 == gpos_len && 3046 == gsub_len)
90 /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */
91 || (478 == gdef_len && 41902 == gpos_len && 3046 == gsub_len)
92 )
93 {
94 /* In certain versions of Times New Roman Italic and Bold Italic,
95 * ASCII double quotation mark U+0022, mapped to glyph 5, has wrong
96 * glyph class 3 (mark) in GDEF. Nuke the GDEF to avoid zero-width
97 * double-quote. See:
98 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
99 */
100 if (3 == layout->gdef->get_glyph_class (5))
101 layout->gdef = &Null(OT::GDEF);
102 }
103 else if (0
104 /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */
105 || (898 == gdef_len && 46470 == gpos_len && 12554 == gsub_len)
106 /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */
107 || (910 == gdef_len && 47732 == gpos_len && 12566 == gsub_len)
108 /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */
109 || (928 == gdef_len && 59332 == gpos_len && 23298 == gsub_len)
110 /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */
111 || (940 == gdef_len && 60732 == gpos_len && 23310 == gsub_len)
112 /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
113 || (964 == gdef_len && 60072 == gpos_len && 23836 == gsub_len)
114 /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
115 || (976 == gdef_len && 61456 == gpos_len && 23832 == gsub_len)
116 /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */
117 || (994 == gdef_len && 60336 == gpos_len && 24474 == gsub_len)
118 /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */
119 || (1006 == gdef_len && 61740 == gpos_len && 24470 == gsub_len)
120 /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
121 || (1006 == gdef_len && 61346 == gpos_len && 24576 == gsub_len)
122 /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
123 || (1018 == gdef_len && 62828 == gpos_len && 24572 == gsub_len)
124 /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */
125 || (1006 == gdef_len && 61352 == gpos_len && 24576 == gsub_len)
126 /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */
127 || (1018 == gdef_len && 62834 == gpos_len && 24572 == gsub_len)
128 /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */
129 || (832 == gdef_len && 47162 == gpos_len && 7324 == gsub_len)
130 /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */
131 || (844 == gdef_len && 45474 == gpos_len && 7302 == gsub_len)
132 /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */
133 || (180 == gdef_len && 7254 == gpos_len && 13054 == gsub_len)
134 /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */
135 || (192 == gdef_len && 7254 == gpos_len && 12638 == gsub_len)
136 /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */
137 || (192 == gdef_len && 7254 == gpos_len && 12690 == gsub_len)
138 /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */
139 /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */
140 || (188 == gdef_len && 3852 == gpos_len && 248 == gsub_len)
141 /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */
142 /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */
143 || (188 == gdef_len && 3426 == gpos_len && 264 == gsub_len)
144 /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */
145 || (1058 == gdef_len && 11818 == gpos_len && 47032 == gsub_len)
146 /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/
147 || (1046 == gdef_len && 12600 == gpos_len && 47030 == gsub_len)
148 /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */
149 || (1058 == gdef_len && 16770 == gpos_len && 71796 == gsub_len)
150 /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */
151 || (1046 == gdef_len && 17862 == gpos_len && 71790 == gsub_len)
152 /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */
153 || (1046 == gdef_len && 17112 == gpos_len && 71788 == gsub_len)
154 /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */
155 || (1058 == gdef_len && 17514 == gpos_len && 71794 == gsub_len)
156 /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */
157 || (1330 == gdef_len && 57938 == gpos_len && 109904 == gsub_len)
158 /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */
159 || (1330 == gdef_len && 58972 == gpos_len && 109904 == gsub_len)
160 /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf
161 * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */
162 || (1004 == gdef_len && 14836 == gpos_len && 59092 == gsub_len)
163 )
164 {
165 /* Many versions of Tahoma have bad GDEF tables that incorrectly classify some spacing marks
166 * such as certain IPA symbols as glyph class 3. So do older versions of Microsoft Himalaya,
167 * and the version of Cantarell shipped by Ubuntu 16.04.
168 * Nuke the GDEF tables of these fonts to avoid unwanted width-zeroing.
169 * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925
170 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693
171 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875
172 */
173 layout->gdef = &Null(OT::GDEF);
174 }
175 }
176
177 layout->gsub_lookup_count = layout->gsub->get_lookup_count ();
178 layout->gpos_lookup_count = layout->gpos->get_lookup_count ();
179
180 layout->gsub_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
181 layout->gpos_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
182
183 if (unlikely ((layout->gsub_lookup_count && !layout->gsub_accels) ||
184 (layout->gpos_lookup_count && !layout->gpos_accels)))
185 {
186 _hb_ot_layout_destroy (layout);
187 return nullptr;
188 }
189
190 for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
191 layout->gsub_accels[i].init (layout->gsub->get_lookup (i));
192 for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
193 layout->gpos_accels[i].init (layout->gpos->get_lookup (i));
194
195 return layout;
196 }
197
198 void
199 _hb_ot_layout_destroy (hb_ot_layout_t *layout)
200 {
201 if (layout->gsub_accels)
202 for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
203 layout->gsub_accels[i].fini ();
204 if (layout->gpos_accels)
205 for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
206 layout->gpos_accels[i].fini ();
207
208 free (layout->gsub_accels);
209 free (layout->gpos_accels);
210
211 hb_blob_destroy (layout->gdef_blob);
212 hb_blob_destroy (layout->gsub_blob);
213 hb_blob_destroy (layout->gpos_blob);
214
215 layout->math.fini ();
216 layout->fvar.fini ();
217 layout->avar.fini ();
218
219 free (layout);
220 }
221
222 // static inline const OT::BASE&
223 // _get_base (hb_face_t *face)
224 // {
225 // if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::BASE);
226 // hb_ot_layout_t * layout = hb_ot_layout_from_face (face);
227 // return *(layout->base.get ());
228 // }
229
230 static inline const OT::GDEF&
231 _get_gdef (hb_face_t *face)
232 {
233 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GDEF);
234 return *hb_ot_layout_from_face (face)->gdef;
235 }
236 static inline const OT::GSUB&
237 _get_gsub (hb_face_t *face)
238 {
239 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GSUB);
240 return *hb_ot_layout_from_face (face)->gsub;
241 }
242 static inline const OT::GPOS&
243 _get_gpos (hb_face_t *face)
244 {
245 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return Null(OT::GPOS);
246 return *hb_ot_layout_from_face (face)->gpos;
247 }
248
249 /*
250 * GDEF
251 */
252
253 hb_bool_t
254 hb_ot_layout_has_glyph_classes (hb_face_t *face)
255 {
256 return _get_gdef (face).has_glyph_classes ();
257 }
258
259 /**
260 * hb_ot_layout_get_glyph_class:
261 *
262 * Since: 0.9.7
263 **/
264 hb_ot_layout_glyph_class_t
265 hb_ot_layout_get_glyph_class (hb_face_t *face,
266 hb_codepoint_t glyph)
267 {
268 return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph);
269 }
270
271 /**
272 * hb_ot_layout_get_glyphs_in_class:
273 *
274 * Since: 0.9.7
275 **/
276 void
277 hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
278 hb_ot_layout_glyph_class_t klass,
279 hb_set_t *glyphs /* OUT */)
280 {
281 return _get_gdef (face).get_glyphs_in_class (klass, glyphs);
282 }
283
284 unsigned int
285 hb_ot_layout_get_attach_points (hb_face_t *face,
286 hb_codepoint_t glyph,
287 unsigned int start_offset,
288 unsigned int *point_count /* IN/OUT */,
289 unsigned int *point_array /* OUT */)
290 {
291 return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
292 }
293
294 unsigned int
295 hb_ot_layout_get_ligature_carets (hb_font_t *font,
296 hb_direction_t direction,
297 hb_codepoint_t glyph,
298 unsigned int start_offset,
299 unsigned int *caret_count /* IN/OUT */,
300 hb_position_t *caret_array /* OUT */)
301 {
302 return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
303 }
304
305
306 /*
307 * GSUB/GPOS
308 */
309
310 static const OT::GSUBGPOS&
311 get_gsubgpos_table (hb_face_t *face,
312 hb_tag_t table_tag)
313 {
314 switch (table_tag) {
315 case HB_OT_TAG_GSUB: return _get_gsub (face);
316 case HB_OT_TAG_GPOS: return _get_gpos (face);
317 default: return Null(OT::GSUBGPOS);
318 }
319 }
320
321
322 unsigned int
323 hb_ot_layout_table_get_script_tags (hb_face_t *face,
324 hb_tag_t table_tag,
325 unsigned int start_offset,
326 unsigned int *script_count /* IN/OUT */,
327 hb_tag_t *script_tags /* OUT */)
328 {
329 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
330
331 return g.get_script_tags (start_offset, script_count, script_tags);
332 }
333
334 #define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
335
336 hb_bool_t
353 * including many versions of DejaVu Sans Mono! */
354 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
355 return false;
356
357 /* try with 'latn'; some old fonts put their features there even though
358 they're really trying to support Thai, for example :( */
359 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index))
360 return false;
361
362 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
363 return false;
364 }
365
366 hb_bool_t
367 hb_ot_layout_table_choose_script (hb_face_t *face,
368 hb_tag_t table_tag,
369 const hb_tag_t *script_tags,
370 unsigned int *script_index,
371 hb_tag_t *chosen_script)
372 {
373 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX), "");
374 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
375
376 while (*script_tags)
377 {
378 if (g.find_script_index (*script_tags, script_index)) {
379 if (chosen_script)
380 *chosen_script = *script_tags;
381 return true;
382 }
383 script_tags++;
384 }
385
386 /* try finding 'DFLT' */
387 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
388 if (chosen_script)
389 *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
390 return false;
391 }
392
393 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
394 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
395 if (chosen_script)
396 *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
397 return false;
398 }
399
400 /* try with 'latn'; some old fonts put their features there even though
401 they're really trying to support Thai, for example :( */
402 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
403 if (chosen_script)
406 }
407
408 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
409 if (chosen_script)
410 *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
411 return false;
412 }
413
414 unsigned int
415 hb_ot_layout_table_get_feature_tags (hb_face_t *face,
416 hb_tag_t table_tag,
417 unsigned int start_offset,
418 unsigned int *feature_count /* IN/OUT */,
419 hb_tag_t *feature_tags /* OUT */)
420 {
421 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
422
423 return g.get_feature_tags (start_offset, feature_count, feature_tags);
424 }
425
426 hb_bool_t
427 hb_ot_layout_table_find_feature (hb_face_t *face,
428 hb_tag_t table_tag,
429 hb_tag_t feature_tag,
430 unsigned int *feature_index)
431 {
432 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX), "");
433 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
434
435 unsigned int num_features = g.get_feature_count ();
436 for (unsigned int i = 0; i < num_features; i++)
437 {
438 if (feature_tag == g.get_feature_tag (i)) {
439 if (feature_index) *feature_index = i;
440 return true;
441 }
442 }
443
444 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
445 return false;
446 }
449 unsigned int
450 hb_ot_layout_script_get_language_tags (hb_face_t *face,
451 hb_tag_t table_tag,
452 unsigned int script_index,
453 unsigned int start_offset,
454 unsigned int *language_count /* IN/OUT */,
455 hb_tag_t *language_tags /* OUT */)
456 {
457 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
458
459 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
460 }
461
462 hb_bool_t
463 hb_ot_layout_script_find_language (hb_face_t *face,
464 hb_tag_t table_tag,
465 unsigned int script_index,
466 hb_tag_t language_tag,
467 unsigned int *language_index)
468 {
469 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX), "");
470 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
471
472 if (s.find_lang_sys_index (language_tag, language_index))
473 return true;
474
475 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
476 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
477 return false;
478
479 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
480 return false;
481 }
482
483 hb_bool_t
484 hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
485 hb_tag_t table_tag,
486 unsigned int script_index,
487 unsigned int language_index,
488 unsigned int *feature_index)
489 {
490 return hb_ot_layout_language_get_required_feature (face,
491 table_tag,
492 script_index,
493 language_index,
494 feature_index,
495 nullptr);
598 unsigned int *lookup_indexes /* OUT */)
599 {
600 return hb_ot_layout_feature_with_variations_get_lookups (face,
601 table_tag,
602 feature_index,
603 HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
604 start_offset,
605 lookup_count,
606 lookup_indexes);
607 }
608
609 /**
610 * hb_ot_layout_table_get_lookup_count:
611 *
612 * Since: 0.9.22
613 **/
614 unsigned int
615 hb_ot_layout_table_get_lookup_count (hb_face_t *face,
616 hb_tag_t table_tag)
617 {
618 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return 0;
619 switch (table_tag)
620 {
621 case HB_OT_TAG_GSUB:
622 {
623 return hb_ot_layout_from_face (face)->gsub_lookup_count;
624 }
625 case HB_OT_TAG_GPOS:
626 {
627 return hb_ot_layout_from_face (face)->gpos_lookup_count;
628 }
629 }
630 return 0;
631 }
632
633 static void
634 _hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
635 hb_tag_t table_tag,
636 unsigned int feature_index,
637 hb_set_t *lookup_indexes /* OUT */)
638 {
639 unsigned int lookup_indices[32];
640 unsigned int offset, len;
641
642 offset = 0;
643 do {
644 len = ARRAY_LENGTH (lookup_indices);
645 hb_ot_layout_feature_get_lookups (face,
646 table_tag,
647 feature_index,
648 offset, &len,
649 lookup_indices);
650
651 for (unsigned int i = 0; i < len; i++)
652 lookup_indexes->add (lookup_indices[i]);
653
654 offset += len;
655 } while (len == ARRAY_LENGTH (lookup_indices));
656 }
657
658 static void
659 _hb_ot_layout_collect_lookups_features (hb_face_t *face,
660 hb_tag_t table_tag,
661 unsigned int script_index,
662 unsigned int language_index,
663 const hb_tag_t *features,
664 hb_set_t *lookup_indexes /* OUT */)
665 {
666 if (!features)
667 {
668 unsigned int required_feature_index;
669 if (hb_ot_layout_language_get_required_feature (face,
670 table_tag,
671 script_index,
672 language_index,
673 &required_feature_index,
674 nullptr))
675 _hb_ot_layout_collect_lookups_lookups (face,
676 table_tag,
677 required_feature_index,
678 lookup_indexes);
679
680 /* All features */
681 unsigned int feature_indices[32];
682 unsigned int offset, len;
683
684 offset = 0;
685 do {
686 len = ARRAY_LENGTH (feature_indices);
687 hb_ot_layout_language_get_feature_indexes (face,
688 table_tag,
689 script_index,
690 language_index,
691 offset, &len,
692 feature_indices);
693
694 for (unsigned int i = 0; i < len; i++)
695 _hb_ot_layout_collect_lookups_lookups (face,
696 table_tag,
697 feature_indices[i],
698 lookup_indexes);
699
700 offset += len;
701 } while (len == ARRAY_LENGTH (feature_indices));
702 }
703 else
704 {
705 for (; *features; features++)
706 {
707 unsigned int feature_index;
708 if (hb_ot_layout_language_find_feature (face,
709 table_tag,
710 script_index,
711 language_index,
712 *features,
713 &feature_index))
714 _hb_ot_layout_collect_lookups_lookups (face,
715 table_tag,
716 feature_index,
717 lookup_indexes);
718 }
719 }
720 }
721
722 static void
723 _hb_ot_layout_collect_lookups_languages (hb_face_t *face,
724 hb_tag_t table_tag,
725 unsigned int script_index,
726 const hb_tag_t *languages,
727 const hb_tag_t *features,
728 hb_set_t *lookup_indexes /* OUT */)
729 {
730 _hb_ot_layout_collect_lookups_features (face,
731 table_tag,
732 script_index,
733 HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
734 features,
735 lookup_indexes);
736
737 if (!languages)
738 {
739 /* All languages */
740 unsigned int count = hb_ot_layout_script_get_language_tags (face,
741 table_tag,
742 script_index,
743 0, nullptr, nullptr);
744 for (unsigned int language_index = 0; language_index < count; language_index++)
745 _hb_ot_layout_collect_lookups_features (face,
746 table_tag,
747 script_index,
748 language_index,
749 features,
750 lookup_indexes);
751 }
752 else
753 {
754 for (; *languages; languages++)
755 {
756 unsigned int language_index;
757 if (hb_ot_layout_script_find_language (face,
758 table_tag,
759 script_index,
760 *languages,
761 &language_index))
762 _hb_ot_layout_collect_lookups_features (face,
763 table_tag,
764 script_index,
765 language_index,
766 features,
767 lookup_indexes);
768 }
769 }
770 }
771
772 /**
773 * hb_ot_layout_collect_lookups:
774 *
775 * Since: 0.9.8
776 **/
777 void
778 hb_ot_layout_collect_lookups (hb_face_t *face,
779 hb_tag_t table_tag,
780 const hb_tag_t *scripts,
781 const hb_tag_t *languages,
782 const hb_tag_t *features,
783 hb_set_t *lookup_indexes /* OUT */)
784 {
785 if (!scripts)
786 {
787 /* All scripts */
788 unsigned int count = hb_ot_layout_table_get_script_tags (face,
789 table_tag,
790 0, nullptr, nullptr);
791 for (unsigned int script_index = 0; script_index < count; script_index++)
792 _hb_ot_layout_collect_lookups_languages (face,
793 table_tag,
794 script_index,
795 languages,
796 features,
797 lookup_indexes);
798 }
799 else
800 {
801 for (; *scripts; scripts++)
802 {
803 unsigned int script_index;
804 if (hb_ot_layout_table_find_script (face,
805 table_tag,
806 *scripts,
807 &script_index))
808 _hb_ot_layout_collect_lookups_languages (face,
809 table_tag,
810 script_index,
811 languages,
812 features,
813 lookup_indexes);
814 }
815 }
816 }
817
818 /**
819 * hb_ot_layout_lookup_collect_glyphs:
820 *
821 * Since: 0.9.7
822 **/
823 void
824 hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
825 hb_tag_t table_tag,
826 unsigned int lookup_index,
827 hb_set_t *glyphs_before, /* OUT. May be nullptr */
828 hb_set_t *glyphs_input, /* OUT. May be nullptr */
829 hb_set_t *glyphs_after, /* OUT. May be nullptr */
830 hb_set_t *glyphs_output /* OUT. May be nullptr */)
831 {
832 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
833
834 OT::hb_collect_glyphs_context_t c (face,
835 glyphs_before,
836 glyphs_input,
837 glyphs_after,
838 glyphs_output);
839
840 switch (table_tag)
841 {
842 case HB_OT_TAG_GSUB:
843 {
844 const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
845 l.collect_glyphs (&c);
846 return;
847 }
848 case HB_OT_TAG_GPOS:
849 {
850 const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index);
851 l.collect_glyphs (&c);
852 return;
853 }
854 }
855 }
856
857
858 /* Variations support */
859
860 hb_bool_t
861 hb_ot_layout_table_find_feature_variations (hb_face_t *face,
862 hb_tag_t table_tag,
863 const int *coords,
864 unsigned int num_coords,
865 unsigned int *variations_index /* out */)
866 {
867 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
868
869 return g.find_variations_index (coords, num_coords, variations_index);
870 }
877 unsigned int start_offset,
878 unsigned int *lookup_count /* IN/OUT */,
879 unsigned int *lookup_indexes /* OUT */)
880 {
881 static_assert ((OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX), "");
882 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
883
884 const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
885
886 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
887 }
888
889
890 /*
891 * OT::GSUB
892 */
893
894 hb_bool_t
895 hb_ot_layout_has_substitution (hb_face_t *face)
896 {
897 return &_get_gsub (face) != &Null(OT::GSUB);
898 }
899
900 /**
901 * hb_ot_layout_lookup_would_substitute:
902 *
903 * Since: 0.9.7
904 **/
905 hb_bool_t
906 hb_ot_layout_lookup_would_substitute (hb_face_t *face,
907 unsigned int lookup_index,
908 const hb_codepoint_t *glyphs,
909 unsigned int glyphs_length,
910 hb_bool_t zero_context)
911 {
912 if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false;
913 return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context);
914 }
915
916 hb_bool_t
917 hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
918 unsigned int lookup_index,
919 const hb_codepoint_t *glyphs,
920 unsigned int glyphs_length,
921 hb_bool_t zero_context)
922 {
923 if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false;
924 OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
925
926 const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
927
928 return l.would_apply (&c, &hb_ot_layout_from_face (face)->gsub_accels[lookup_index]);
929 }
930
931 void
932 hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
933 {
934 OT::GSUB::substitute_start (font, buffer);
935 }
936
937 /**
938 * hb_ot_layout_lookup_substitute_closure:
939 *
940 * Since: 0.9.7
941 **/
942 void
943 hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
944 unsigned int lookup_index,
945 hb_set_t *glyphs)
946 {
947 hb_auto_t<hb_map_t> done_lookups;
948 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
949
950 const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
951
952 l.closure (&c, lookup_index);
953 }
954
955 /**
956 * hb_ot_layout_lookups_substitute_closure:
957 *
958 * Compute the transitive closure of glyphs needed for all of the
959 * provided lookups.
960 *
961 * Since: 1.8.1
962 **/
963 void
964 hb_ot_layout_lookups_substitute_closure (hb_face_t *face,
965 const hb_set_t *lookups,
966 hb_set_t *glyphs)
967 {
968 hb_auto_t<hb_map_t> done_lookups;
969 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
970 const OT::GSUB& gsub = _get_gsub (face);
971
972 unsigned int glyphs_length;
973 do
974 {
975 glyphs_length = glyphs->get_population ();
976 if (lookups != nullptr)
977 {
978 for (hb_codepoint_t lookup_index = HB_SET_VALUE_INVALID; hb_set_next (lookups, &lookup_index);)
979 gsub.get_lookup (lookup_index).closure (&c, lookup_index);
980 }
981 else
982 {
983 for (unsigned int i = 0; i < gsub.get_lookup_count (); i++)
984 gsub.get_lookup (i).closure (&c, i);
985 }
986 } while (glyphs_length != glyphs->get_population ());
987 }
988
989 /*
990 * OT::GPOS
991 */
992
993 hb_bool_t
994 hb_ot_layout_has_positioning (hb_face_t *face)
995 {
996 return &_get_gpos (face) != &Null(OT::GPOS);
997 }
998
999 void
1000 hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
1001 {
1002 OT::GPOS::position_start (font, buffer);
1003 }
1004
1005 void
1006 hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
1007 {
1008 OT::GPOS::position_finish_advances (font, buffer);
1009 }
1010
1011 void
1012 hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
1013 {
1014 OT::GPOS::position_finish_offsets (font, buffer);
1015 }
1016
1017 /**
1018 * hb_ot_layout_get_size_params:
1019 *
1020 * Since: 0.9.10
1021 **/
1022 hb_bool_t
1023 hb_ot_layout_get_size_params (hb_face_t *face,
1024 unsigned int *design_size, /* OUT. May be nullptr */
1025 unsigned int *subfamily_id, /* OUT. May be nullptr */
1026 unsigned int *subfamily_name_id, /* OUT. May be nullptr */
1027 unsigned int *range_start, /* OUT. May be nullptr */
1028 unsigned int *range_end /* OUT. May be nullptr */)
1029 {
1030 const OT::GPOS &gpos = _get_gpos (face);
1031 const hb_tag_t tag = HB_TAG ('s','i','z','e');
1032
1033 unsigned int num_features = gpos.get_feature_count ();
1034 for (unsigned int i = 0; i < num_features; i++)
1035 {
1036 if (tag == gpos.get_feature_tag (i))
1037 {
1038 const OT::Feature &f = gpos.get_feature (i);
1039 const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag);
1040
1041 if (params.designSize)
1042 {
1043 #define PARAM(a, A) if (a) *a = params.A
1044 PARAM (design_size, designSize);
1045 PARAM (subfamily_id, subfamilyID);
1046 PARAM (subfamily_name_id, subfamilyNameID);
1047 PARAM (range_start, rangeStart);
1048 PARAM (range_end, rangeEnd);
1049 #undef PARAM
1050
1051 return true;
1052 }
1053 }
1054 }
1055
1056 #define PARAM(a, A) if (a) *a = 0
1057 PARAM (design_size, designSize);
1058 PARAM (subfamily_id, subfamilyID);
1059 PARAM (subfamily_name_id, subfamilyNameID);
1060 PARAM (range_start, rangeStart);
1061 PARAM (range_end, rangeEnd);
1062 #undef PARAM
1063
1064 return false;
1065 }
1066
1067
1068 /*
1069 * Parts of different types are implemented here such that they have direct
1070 * access to GSUB/GPOS lookups.
1071 */
1072
1073
1074 struct GSUBProxy
1075 {
1076 static const unsigned int table_index = 0;
1077 static const bool inplace = false;
1078 typedef OT::SubstLookup Lookup;
1079
1080 GSUBProxy (hb_face_t *face) :
1081 table (*hb_ot_layout_from_face (face)->gsub),
1082 accels (hb_ot_layout_from_face (face)->gsub_accels) {}
1083
1084 const OT::GSUB &table;
1085 const hb_ot_layout_lookup_accelerator_t *accels;
1086 };
1087
1088 struct GPOSProxy
1089 {
1090 static const unsigned int table_index = 1;
1091 static const bool inplace = true;
1092 typedef OT::PosLookup Lookup;
1093
1094 GPOSProxy (hb_face_t *face) :
1095 table (*hb_ot_layout_from_face (face)->gpos),
1096 accels (hb_ot_layout_from_face (face)->gpos_accels) {}
1097
1098 const OT::GPOS &table;
1099 const hb_ot_layout_lookup_accelerator_t *accels;
1100 };
1101
1102
1103 struct hb_get_subtables_context_t :
1104 OT::hb_dispatch_context_t<hb_get_subtables_context_t, hb_void_t, HB_DEBUG_APPLY>
1105 {
1106 template <typename Type>
1107 static inline bool apply_to (const void *obj, OT::hb_ot_apply_context_t *c)
1108 {
1109 const Type *typed_obj = (const Type *) obj;
1110 return typed_obj->apply (c);
1111 }
1112
1113 typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_ot_apply_context_t *c);
1114
1115 struct hb_applicable_t
1116 {
1117 inline void init (const void *obj_, hb_apply_func_t apply_func_)
1118 {
1119 obj = obj_;
1120 apply_func = apply_func_;
1121 }
1122
1123 inline bool apply (OT::hb_ot_apply_context_t *c) const { return apply_func (obj, c); }
1124
1125 private:
1126 const void *obj;
1127 hb_apply_func_t apply_func;
1128 };
1129
1130 typedef hb_auto_t<hb_vector_t<hb_applicable_t> > array_t;
1131
1132 /* Dispatch interface. */
1133 inline const char *get_name (void) { return "GET_SUBTABLES"; }
1134 template <typename T>
1135 inline return_t dispatch (const T &obj)
1136 {
1137 hb_applicable_t *entry = array.push();
1138 entry->init (&obj, apply_to<T>);
1139 return HB_VOID;
1140 }
1141 static return_t default_return_value (void) { return HB_VOID; }
1142 bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
1143
1144 hb_get_subtables_context_t (array_t &array_) :
1145 array (array_),
1146 debug_depth (0) {}
1147
1148 array_t &array;
1149 unsigned int debug_depth;
1150 };
1151
1152 static inline bool
1153 apply_forward (OT::hb_ot_apply_context_t *c,
1154 const hb_ot_layout_lookup_accelerator_t &accel,
1155 const hb_get_subtables_context_t::array_t &subtables)
1156 {
1157 bool ret = false;
1158 hb_buffer_t *buffer = c->buffer;
1159 while (buffer->idx < buffer->len && buffer->successful)
1160 {
1161 bool applied = false;
1162 if (accel.may_have (buffer->cur().codepoint) &&
1163 (buffer->cur().mask & c->lookup_mask) &&
1164 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1165 {
1166 for (unsigned int i = 0; i < subtables.len; i++)
1167 if (subtables[i].apply (c))
1168 {
1169 applied = true;
1170 break;
1171 }
1172 }
1173
1174 if (applied)
1175 ret = true;
1176 else
1177 buffer->next_glyph ();
1178 }
1179 return ret;
1180 }
1181
1182 static inline bool
1183 apply_backward (OT::hb_ot_apply_context_t *c,
1184 const hb_ot_layout_lookup_accelerator_t &accel,
1185 const hb_get_subtables_context_t::array_t &subtables)
1186 {
1187 bool ret = false;
1188 hb_buffer_t *buffer = c->buffer;
1189 do
1190 {
1191 if (accel.may_have (buffer->cur().codepoint) &&
1192 (buffer->cur().mask & c->lookup_mask) &&
1193 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1194 {
1195 for (unsigned int i = 0; i < subtables.len; i++)
1196 if (subtables[i].apply (c))
1197 {
1198 ret = true;
1199 break;
1200 }
1201 }
1202 /* The reverse lookup doesn't "advance" cursor (for good reason). */
1203 buffer->idx--;
1204
1205 }
1206 while ((int) buffer->idx >= 0);
1207 return ret;
1208 }
1209
1210 template <typename Proxy>
1211 static inline void
1212 apply_string (OT::hb_ot_apply_context_t *c,
1213 const typename Proxy::Lookup &lookup,
1214 const hb_ot_layout_lookup_accelerator_t &accel)
1215 {
1216 hb_buffer_t *buffer = c->buffer;
1217
1218 if (unlikely (!buffer->len || !c->lookup_mask))
1219 return;
1220
1221 c->set_lookup_props (lookup.get_props ());
1222
1223 hb_get_subtables_context_t::array_t subtables;
1224 hb_get_subtables_context_t c_get_subtables (subtables);
1225 lookup.dispatch (&c_get_subtables);
1226
1227 if (likely (!lookup.is_reverse ()))
1228 {
1229 /* in/out forward substitution/positioning */
1230 if (Proxy::table_index == 0)
1231 buffer->clear_output ();
1232 buffer->idx = 0;
1233
1234 bool ret;
1235 ret = apply_forward (c, accel, subtables);
1236 if (ret)
1237 {
1238 if (!Proxy::inplace)
1239 buffer->swap_buffers ();
1240 else
1241 assert (!buffer->has_separate_output ());
1242 }
1243 }
1244 else
1245 {
1246 /* in-place backward substitution/positioning */
1247 if (Proxy::table_index == 0)
1248 buffer->remove_output ();
1249 buffer->idx = buffer->len - 1;
1250
1251 apply_backward (c, accel, subtables);
1252 }
1253 }
1254
1255 template <typename Proxy>
1256 inline void hb_ot_map_t::apply (const Proxy &proxy,
1257 const hb_ot_shape_plan_t *plan,
1258 hb_font_t *font,
1259 hb_buffer_t *buffer) const
1260 {
1261 const unsigned int table_index = proxy.table_index;
1262 unsigned int i = 0;
1263 OT::hb_ot_apply_context_t c (table_index, font, buffer);
1264 c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
1265
1266 for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) {
1267 const stage_map_t *stage = &stages[table_index][stage_index];
1268 for (; i < stage->last_lookup; i++)
1269 {
1270 unsigned int lookup_index = lookups[table_index][i].index;
1271 if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
1272 c.set_lookup_index (lookup_index);
1273 c.set_lookup_mask (lookups[table_index][i].mask);
1274 c.set_auto_zwj (lookups[table_index][i].auto_zwj);
1275 c.set_auto_zwnj (lookups[table_index][i].auto_zwnj);
1276 apply_string<Proxy> (&c,
1277 proxy.table.get_lookup (lookup_index),
1278 proxy.accels[lookup_index]);
1279 (void) buffer->message (font, "end lookup %d", lookup_index);
1280 }
1281
1282 if (stage->pause_func)
1283 {
1284 buffer->clear_output ();
1285 stage->pause_func (plan, font, buffer);
1286 }
1287 }
1288 }
1289
1290 void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1291 {
1292 GSUBProxy proxy (font->face);
1293 apply (proxy, plan, font, buffer);
1294 }
1295
1296 void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1297 {
1298 GPOSProxy proxy (font->face);
1299 apply (proxy, plan, font, buffer);
1300 }
1301
1302 void
1303 hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
1304 const OT::SubstLookup &lookup,
1305 const hb_ot_layout_lookup_accelerator_t &accel)
1306 {
1307 apply_string<GSUBProxy> (c, lookup, accel);
1308 }
1309
1310
1311
1312
1313 /*
1314 * OT::BASE
1315 */
1316
1317 // /**
1318 // * hb_ot_base_has_data:
1319 // * @face: #hb_face_t to test
1320 // *
1321 // * This function allows to verify the presence of an OpenType BASE table on the
1322 // * face.
1323 // *
1324 // * Return value: true if face has a BASE table, false otherwise
1325 // *
1326 // * Since: XXX
1327 // **/
1328 // hb_bool_t
1329 // hb_ot_base_has_data (hb_face_t *face)
1330 // {
1331 // return &_get_base (face) != &Null(OT::BASE);
1332 // }
|
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-kern-table.hh"
38 #include "hb-ot-gasp-table.hh" // Just so we compile it; unused otherwise.
39 #include "hb-ot-layout-gdef-table.hh"
40 #include "hb-ot-layout-gsub-table.hh"
41 #include "hb-ot-layout-gpos-table.hh"
42 #include "hb-ot-layout-base-table.hh" // Just so we compile it; unused otherwise.
43 #include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise.
44 #include "hb-ot-name-table.hh"
45 #include "hb-ot-os2-table.hh"
46
47 #include "hb-aat-layout-lcar-table.hh"
48 #include "hb-aat-layout-morx-table.hh"
49
50
51 /**
52 * SECTION:hb-ot-layout
53 * @title: hb-ot-layout
54 * @short_description: OpenType Layout
55 * @include: hb-ot.h
56 *
57 * Functions for querying OpenType Layout features in the font face.
58 **/
59
60
61 /*
62 * kern
63 */
64
65 bool
66 hb_ot_layout_has_kerning (hb_face_t *face)
67 {
68 return face->table.kern->has_data ();
69 }
70
71 bool
72 hb_ot_layout_has_machine_kerning (hb_face_t *face)
73 {
74 return face->table.kern->has_state_machine ();
75 }
76
77 bool
78 hb_ot_layout_has_cross_kerning (hb_face_t *face)
79 {
80 return face->table.kern->has_cross_stream ();
81 }
82
83 void
84 hb_ot_layout_kern (const hb_ot_shape_plan_t *plan,
85 hb_font_t *font,
86 hb_buffer_t *buffer)
87 {
88 hb_blob_t *blob = font->face->table.kern.get_blob ();
89 const AAT::kern& kern = *blob->as<AAT::kern> ();
90
91 AAT::hb_aat_apply_context_t c (plan, font, buffer, blob);
92
93 kern.apply (&c);
94 }
95
96
97 /*
98 * GDEF
99 */
100
101 bool
102 OT::GDEF::is_blacklisted (hb_blob_t *blob,
103 hb_face_t *face) const
104 {
105 /* The ugly business of blacklisting individual fonts' tables happen here!
106 * See this thread for why we finally had to bend in and do this:
107 * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
108 *
109 * In certain versions of Times New Roman Italic and Bold Italic,
110 * ASCII double quotation mark U+0022 has wrong glyph class 3 (mark)
111 * in GDEF. Many versions of Tahoma have bad GDEF tables that
112 * incorrectly classify some spacing marks such as certain IPA
113 * symbols as glyph class 3. So do older versions of Microsoft
114 * Himalaya, and the version of Cantarell shipped by Ubuntu 16.04.
115 *
116 * Nuke the GDEF tables of to avoid unwanted width-zeroing.
117 *
118 * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925
119 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693
120 * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875
121 */
122 #define ENCODE(x,y,z) (((uint64_t) (x) << 48) | ((uint64_t) (y) << 24) | (uint64_t) (z))
123 switch ENCODE(blob->length,
124 face->table.GSUB->table.get_length (),
125 face->table.GPOS->table.get_length ())
126 {
127 /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */
128 case ENCODE (442, 2874, 42038):
129 /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */
130 case ENCODE (430, 2874, 40662):
131 /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */
132 case ENCODE (442, 2874, 39116):
133 /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */
134 case ENCODE (430, 2874, 39374):
135 /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */
136 case ENCODE (490, 3046, 41638):
137 /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */
138 case ENCODE (478, 3046, 41902):
139 /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */
140 case ENCODE (898, 12554, 46470):
141 /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */
142 case ENCODE (910, 12566, 47732):
143 /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */
144 case ENCODE (928, 23298, 59332):
145 /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */
146 case ENCODE (940, 23310, 60732):
147 /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
148 case ENCODE (964, 23836, 60072):
149 /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
150 case ENCODE (976, 23832, 61456):
151 /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */
152 case ENCODE (994, 24474, 60336):
153 /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */
154 case ENCODE (1006, 24470, 61740):
155 /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
156 case ENCODE (1006, 24576, 61346):
157 /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
158 case ENCODE (1018, 24572, 62828):
159 /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */
160 case ENCODE (1006, 24576, 61352):
161 /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */
162 case ENCODE (1018, 24572, 62834):
163 /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */
164 case ENCODE (832, 7324, 47162):
165 /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */
166 case ENCODE (844, 7302, 45474):
167 /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */
168 case ENCODE (180, 13054, 7254):
169 /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */
170 case ENCODE (192, 12638, 7254):
171 /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */
172 case ENCODE (192, 12690, 7254):
173 /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */
174 /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */
175 case ENCODE (188, 248, 3852):
176 /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */
177 /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */
178 case ENCODE (188, 264, 3426):
179 /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */
180 case ENCODE (1058, 47032, 11818):
181 /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/
182 case ENCODE (1046, 47030, 12600):
183 /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */
184 case ENCODE (1058, 71796, 16770):
185 /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */
186 case ENCODE (1046, 71790, 17862):
187 /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */
188 case ENCODE (1046, 71788, 17112):
189 /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */
190 case ENCODE (1058, 71794, 17514):
191 /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */
192 case ENCODE (1330, 109904, 57938):
193 /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */
194 case ENCODE (1330, 109904, 58972):
195 /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf
196 * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */
197 case ENCODE (1004, 59092, 14836):
198 return true;
199 #undef ENCODE
200 }
201 return false;
202 }
203
204 static void
205 _hb_ot_layout_set_glyph_props (hb_font_t *font,
206 hb_buffer_t *buffer)
207 {
208 _hb_buffer_assert_gsubgpos_vars (buffer);
209
210 const OT::GDEF &gdef = *font->face->table.GDEF->table;
211 unsigned int count = buffer->len;
212 for (unsigned int i = 0; i < count; i++)
213 {
214 _hb_glyph_info_set_glyph_props (&buffer->info[i], gdef.get_glyph_props (buffer->info[i].codepoint));
215 _hb_glyph_info_clear_lig_props (&buffer->info[i]);
216 buffer->info[i].syllable() = 0;
217 }
218 }
219
220 /* Public API */
221
222 hb_bool_t
223 hb_ot_layout_has_glyph_classes (hb_face_t *face)
224 {
225 return face->table.GDEF->table->has_glyph_classes ();
226 }
227
228 /**
229 * hb_ot_layout_get_glyph_class:
230 *
231 * Since: 0.9.7
232 **/
233 hb_ot_layout_glyph_class_t
234 hb_ot_layout_get_glyph_class (hb_face_t *face,
235 hb_codepoint_t glyph)
236 {
237 return (hb_ot_layout_glyph_class_t) face->table.GDEF->table->get_glyph_class (glyph);
238 }
239
240 /**
241 * hb_ot_layout_get_glyphs_in_class:
242 *
243 * Since: 0.9.7
244 **/
245 void
246 hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
247 hb_ot_layout_glyph_class_t klass,
248 hb_set_t *glyphs /* OUT */)
249 {
250 return face->table.GDEF->table->get_glyphs_in_class (klass, glyphs);
251 }
252
253 unsigned int
254 hb_ot_layout_get_attach_points (hb_face_t *face,
255 hb_codepoint_t glyph,
256 unsigned int start_offset,
257 unsigned int *point_count /* IN/OUT */,
258 unsigned int *point_array /* OUT */)
259 {
260 return face->table.GDEF->table->get_attach_points (glyph,
261 start_offset,
262 point_count,
263 point_array);
264 }
265
266 unsigned int
267 hb_ot_layout_get_ligature_carets (hb_font_t *font,
268 hb_direction_t direction,
269 hb_codepoint_t glyph,
270 unsigned int start_offset,
271 unsigned int *caret_count /* IN/OUT */,
272 hb_position_t *caret_array /* OUT */)
273 {
274 unsigned int result_caret_count = 0;
275 unsigned int result = font->face->table.GDEF->table->get_lig_carets (font, direction, glyph, start_offset, &result_caret_count, caret_array);
276 if (result)
277 {
278 if (caret_count) *caret_count = result_caret_count;
279 }
280 else
281 result = font->face->table.lcar->get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
282 return result;
283 }
284
285
286 /*
287 * GSUB/GPOS
288 */
289
290 bool
291 OT::GSUB::is_blacklisted (hb_blob_t *blob HB_UNUSED,
292 hb_face_t *face) const
293 {
294 /* Mac OS X prefers morx over GSUB. It also ships with various Indic fonts,
295 * all by 'MUTF' foundry (Tamil MN, Tamil Sangam MN, etc.), that have broken
296 * GSUB/GPOS tables. Some have GSUB with zero scripts, those are ignored by
297 * our morx/GSUB preference code. But if GSUB has non-zero scripts, we tend
298 * to prefer it over morx because we want to be consistent with other OpenType
299 * shapers.
300 *
301 * To work around broken Indic Mac system fonts, we ignore GSUB table if
302 * OS/2 VendorId is 'MUTF' and font has morx table as well.
303 *
304 * https://github.com/harfbuzz/harfbuzz/issues/1410
305 * https://github.com/harfbuzz/harfbuzz/issues/1348
306 * https://github.com/harfbuzz/harfbuzz/issues/1391
307 */
308 if (unlikely (face->table.OS2->achVendID == HB_TAG ('M','U','T','F') &&
309 face->table.morx->has_data ()))
310 return true;
311
312 return false;
313 }
314
315 bool
316 OT::GPOS::is_blacklisted (hb_blob_t *blob HB_UNUSED,
317 hb_face_t *face HB_UNUSED) const
318 {
319 return false;
320 }
321
322 static const OT::GSUBGPOS&
323 get_gsubgpos_table (hb_face_t *face,
324 hb_tag_t table_tag)
325 {
326 switch (table_tag) {
327 case HB_OT_TAG_GSUB: return *face->table.GSUB->table;
328 case HB_OT_TAG_GPOS: return *face->table.GPOS->table;
329 default: return Null(OT::GSUBGPOS);
330 }
331 }
332
333
334 unsigned int
335 hb_ot_layout_table_get_script_tags (hb_face_t *face,
336 hb_tag_t table_tag,
337 unsigned int start_offset,
338 unsigned int *script_count /* IN/OUT */,
339 hb_tag_t *script_tags /* OUT */)
340 {
341 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
342
343 return g.get_script_tags (start_offset, script_count, script_tags);
344 }
345
346 #define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
347
348 hb_bool_t
365 * including many versions of DejaVu Sans Mono! */
366 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
367 return false;
368
369 /* try with 'latn'; some old fonts put their features there even though
370 they're really trying to support Thai, for example :( */
371 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index))
372 return false;
373
374 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
375 return false;
376 }
377
378 hb_bool_t
379 hb_ot_layout_table_choose_script (hb_face_t *face,
380 hb_tag_t table_tag,
381 const hb_tag_t *script_tags,
382 unsigned int *script_index,
383 hb_tag_t *chosen_script)
384 {
385 const hb_tag_t *t;
386 for (t = script_tags; *t; t++);
387 return hb_ot_layout_table_select_script (face, table_tag, t - script_tags, script_tags, script_index, chosen_script);
388 }
389
390 /**
391 * hb_ot_layout_table_select_script:
392 *
393 * Since: 2.0.0
394 **/
395 hb_bool_t
396 hb_ot_layout_table_select_script (hb_face_t *face,
397 hb_tag_t table_tag,
398 unsigned int script_count,
399 const hb_tag_t *script_tags,
400 unsigned int *script_index /* OUT */,
401 hb_tag_t *chosen_script /* OUT */)
402 {
403 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX), "");
404 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
405 unsigned int i;
406
407 for (i = 0; i < script_count; i++)
408 {
409 if (g.find_script_index (script_tags[i], script_index))
410 {
411 if (chosen_script)
412 *chosen_script = script_tags[i];
413 return true;
414 }
415 }
416
417 /* try finding 'DFLT' */
418 if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
419 if (chosen_script)
420 *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
421 return false;
422 }
423
424 /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
425 if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
426 if (chosen_script)
427 *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
428 return false;
429 }
430
431 /* try with 'latn'; some old fonts put their features there even though
432 they're really trying to support Thai, for example :( */
433 if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
434 if (chosen_script)
437 }
438
439 if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
440 if (chosen_script)
441 *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
442 return false;
443 }
444
445 unsigned int
446 hb_ot_layout_table_get_feature_tags (hb_face_t *face,
447 hb_tag_t table_tag,
448 unsigned int start_offset,
449 unsigned int *feature_count /* IN/OUT */,
450 hb_tag_t *feature_tags /* OUT */)
451 {
452 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
453
454 return g.get_feature_tags (start_offset, feature_count, feature_tags);
455 }
456
457 bool
458 hb_ot_layout_table_find_feature (hb_face_t *face,
459 hb_tag_t table_tag,
460 hb_tag_t feature_tag,
461 unsigned int *feature_index)
462 {
463 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX), "");
464 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
465
466 unsigned int num_features = g.get_feature_count ();
467 for (unsigned int i = 0; i < num_features; i++)
468 {
469 if (feature_tag == g.get_feature_tag (i)) {
470 if (feature_index) *feature_index = i;
471 return true;
472 }
473 }
474
475 if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
476 return false;
477 }
480 unsigned int
481 hb_ot_layout_script_get_language_tags (hb_face_t *face,
482 hb_tag_t table_tag,
483 unsigned int script_index,
484 unsigned int start_offset,
485 unsigned int *language_count /* IN/OUT */,
486 hb_tag_t *language_tags /* OUT */)
487 {
488 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
489
490 return s.get_lang_sys_tags (start_offset, language_count, language_tags);
491 }
492
493 hb_bool_t
494 hb_ot_layout_script_find_language (hb_face_t *face,
495 hb_tag_t table_tag,
496 unsigned int script_index,
497 hb_tag_t language_tag,
498 unsigned int *language_index)
499 {
500 return hb_ot_layout_script_select_language (face,
501 table_tag,
502 script_index,
503 1,
504 &language_tag,
505 language_index);
506 }
507
508 /**
509 * hb_ot_layout_script_select_language:
510 *
511 * Since: 2.0.0
512 **/
513 hb_bool_t
514 hb_ot_layout_script_select_language (hb_face_t *face,
515 hb_tag_t table_tag,
516 unsigned int script_index,
517 unsigned int language_count,
518 const hb_tag_t *language_tags,
519 unsigned int *language_index /* OUT */)
520 {
521 static_assert ((OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX), "");
522 const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
523 unsigned int i;
524
525 for (i = 0; i < language_count; i++)
526 {
527 if (s.find_lang_sys_index (language_tags[i], language_index))
528 return true;
529 }
530
531 /* try finding 'dflt' */
532 if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
533 return false;
534
535 if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
536 return false;
537 }
538
539 hb_bool_t
540 hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
541 hb_tag_t table_tag,
542 unsigned int script_index,
543 unsigned int language_index,
544 unsigned int *feature_index)
545 {
546 return hb_ot_layout_language_get_required_feature (face,
547 table_tag,
548 script_index,
549 language_index,
550 feature_index,
551 nullptr);
654 unsigned int *lookup_indexes /* OUT */)
655 {
656 return hb_ot_layout_feature_with_variations_get_lookups (face,
657 table_tag,
658 feature_index,
659 HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
660 start_offset,
661 lookup_count,
662 lookup_indexes);
663 }
664
665 /**
666 * hb_ot_layout_table_get_lookup_count:
667 *
668 * Since: 0.9.22
669 **/
670 unsigned int
671 hb_ot_layout_table_get_lookup_count (hb_face_t *face,
672 hb_tag_t table_tag)
673 {
674 return get_gsubgpos_table (face, table_tag).get_lookup_count ();
675 }
676
677
678 struct hb_collect_features_context_t
679 {
680 hb_collect_features_context_t (hb_face_t *face,
681 hb_tag_t table_tag,
682 hb_set_t *feature_indexes_)
683 : g (get_gsubgpos_table (face, table_tag)),
684 feature_indexes (feature_indexes_),
685 script_count(0),langsys_count(0) {}
686
687 bool visited (const OT::Script &s)
688 {
689 /* We might have Null() object here. Don't want to involve
690 * that in the memoize. So, detect empty objects and return. */
691 if (unlikely (!s.has_default_lang_sys () &&
692 !s.get_lang_sys_count ()))
693 return true;
694
695 if (script_count++ > HB_MAX_SCRIPTS)
696 return true;
697
698 return visited (s, visited_script);
699 }
700 bool visited (const OT::LangSys &l)
701 {
702 /* We might have Null() object here. Don't want to involve
703 * that in the memoize. So, detect empty objects and return. */
704 if (unlikely (!l.has_required_feature () &&
705 !l.get_feature_count ()))
706 return true;
707
708 if (langsys_count++ > HB_MAX_LANGSYS)
709 return true;
710
711 return visited (l, visited_langsys);
712 }
713
714 private:
715 template <typename T>
716 bool visited (const T &p, hb_set_t &visited_set)
717 {
718 hb_codepoint_t delta = (hb_codepoint_t) ((uintptr_t) &p - (uintptr_t) &g);
719 if (visited_set.has (delta))
720 return true;
721
722 visited_set.add (delta);
723 return false;
724 }
725
726 public:
727 const OT::GSUBGPOS &g;
728 hb_set_t *feature_indexes;
729
730 private:
731 hb_set_t visited_script;
732 hb_set_t visited_langsys;
733 unsigned int script_count;
734 unsigned int langsys_count;
735 };
736
737 static void
738 langsys_collect_features (hb_collect_features_context_t *c,
739 const OT::LangSys &l,
740 const hb_tag_t *features)
741 {
742 if (c->visited (l)) return;
743
744 if (!features)
745 {
746 /* All features. */
747 if (l.has_required_feature ())
748 c->feature_indexes->add (l.get_required_feature_index ());
749
750 l.add_feature_indexes_to (c->feature_indexes);
751 }
752 else
753 {
754 /* Ugh. Any faster way? */
755 for (; *features; features++)
756 {
757 hb_tag_t feature_tag = *features;
758 unsigned int num_features = l.get_feature_count ();
759 for (unsigned int i = 0; i < num_features; i++)
760 {
761 unsigned int feature_index = l.get_feature_index (i);
762
763 if (feature_tag == c->g.get_feature_tag (feature_index))
764 {
765 c->feature_indexes->add (feature_index);
766 break;
767 }
768 }
769 }
770 }
771 }
772
773 static void
774 script_collect_features (hb_collect_features_context_t *c,
775 const OT::Script &s,
776 const hb_tag_t *languages,
777 const hb_tag_t *features)
778 {
779 if (c->visited (s)) return;
780
781 if (!languages)
782 {
783 /* All languages. */
784 if (s.has_default_lang_sys ())
785 langsys_collect_features (c,
786 s.get_default_lang_sys (),
787 features);
788
789 unsigned int count = s.get_lang_sys_count ();
790 for (unsigned int language_index = 0; language_index < count; language_index++)
791 langsys_collect_features (c,
792 s.get_lang_sys (language_index),
793 features);
794 }
795 else
796 {
797 for (; *languages; languages++)
798 {
799 unsigned int language_index;
800 if (s.find_lang_sys_index (*languages, &language_index))
801 langsys_collect_features (c,
802 s.get_lang_sys (language_index),
803 features);
804 }
805 }
806 }
807
808 /**
809 * hb_ot_layout_collect_features:
810 *
811 * Since: 1.8.5
812 **/
813 void
814 hb_ot_layout_collect_features (hb_face_t *face,
815 hb_tag_t table_tag,
816 const hb_tag_t *scripts,
817 const hb_tag_t *languages,
818 const hb_tag_t *features,
819 hb_set_t *feature_indexes /* OUT */)
820 {
821 hb_collect_features_context_t c (face, table_tag, feature_indexes);
822 if (!scripts)
823 {
824 /* All scripts. */
825 unsigned int count = c.g.get_script_count ();
826 for (unsigned int script_index = 0; script_index < count; script_index++)
827 script_collect_features (&c,
828 c.g.get_script (script_index),
829 languages,
830 features);
831 }
832 else
833 {
834 for (; *scripts; scripts++)
835 {
836 unsigned int script_index;
837 if (c.g.find_script_index (*scripts, &script_index))
838 script_collect_features (&c,
839 c.g.get_script (script_index),
840 languages,
841 features);
842 }
843 }
844 }
845
846 /**
847 * hb_ot_layout_collect_lookups:
848 *
849 * Since: 0.9.8
850 **/
851 void
852 hb_ot_layout_collect_lookups (hb_face_t *face,
853 hb_tag_t table_tag,
854 const hb_tag_t *scripts,
855 const hb_tag_t *languages,
856 const hb_tag_t *features,
857 hb_set_t *lookup_indexes /* OUT */)
858 {
859 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
860
861 hb_set_t feature_indexes;
862 hb_ot_layout_collect_features (face, table_tag, scripts, languages, features, &feature_indexes);
863
864 for (hb_codepoint_t feature_index = HB_SET_VALUE_INVALID;
865 hb_set_next (&feature_indexes, &feature_index);)
866 g.get_feature (feature_index).add_lookup_indexes_to (lookup_indexes);
867 }
868
869 /**
870 * hb_ot_layout_lookup_collect_glyphs:
871 *
872 * Since: 0.9.7
873 **/
874 void
875 hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
876 hb_tag_t table_tag,
877 unsigned int lookup_index,
878 hb_set_t *glyphs_before, /* OUT. May be NULL */
879 hb_set_t *glyphs_input, /* OUT. May be NULL */
880 hb_set_t *glyphs_after, /* OUT. May be NULL */
881 hb_set_t *glyphs_output /* OUT. May be NULL */)
882 {
883 OT::hb_collect_glyphs_context_t c (face,
884 glyphs_before,
885 glyphs_input,
886 glyphs_after,
887 glyphs_output);
888
889 switch (table_tag)
890 {
891 case HB_OT_TAG_GSUB:
892 {
893 const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index);
894 l.collect_glyphs (&c);
895 return;
896 }
897 case HB_OT_TAG_GPOS:
898 {
899 const OT::PosLookup& l = face->table.GPOS->table->get_lookup (lookup_index);
900 l.collect_glyphs (&c);
901 return;
902 }
903 }
904 }
905
906
907 /* Variations support */
908
909 hb_bool_t
910 hb_ot_layout_table_find_feature_variations (hb_face_t *face,
911 hb_tag_t table_tag,
912 const int *coords,
913 unsigned int num_coords,
914 unsigned int *variations_index /* out */)
915 {
916 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
917
918 return g.find_variations_index (coords, num_coords, variations_index);
919 }
926 unsigned int start_offset,
927 unsigned int *lookup_count /* IN/OUT */,
928 unsigned int *lookup_indexes /* OUT */)
929 {
930 static_assert ((OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX), "");
931 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
932
933 const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
934
935 return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
936 }
937
938
939 /*
940 * OT::GSUB
941 */
942
943 hb_bool_t
944 hb_ot_layout_has_substitution (hb_face_t *face)
945 {
946 return face->table.GSUB->table->has_data ();
947 }
948
949 /**
950 * hb_ot_layout_lookup_would_substitute:
951 *
952 * Since: 0.9.7
953 **/
954 hb_bool_t
955 hb_ot_layout_lookup_would_substitute (hb_face_t *face,
956 unsigned int lookup_index,
957 const hb_codepoint_t *glyphs,
958 unsigned int glyphs_length,
959 hb_bool_t zero_context)
960 {
961 return hb_ot_layout_lookup_would_substitute_fast (face,
962 lookup_index,
963 glyphs, glyphs_length,
964 zero_context);
965 }
966
967 bool
968 hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
969 unsigned int lookup_index,
970 const hb_codepoint_t *glyphs,
971 unsigned int glyphs_length,
972 bool zero_context)
973 {
974 if (unlikely (lookup_index >= face->table.GSUB->lookup_count)) return false;
975 OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
976
977 const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index);
978
979 return l.would_apply (&c, &face->table.GSUB->accels[lookup_index]);
980 }
981
982 void
983 hb_ot_layout_substitute_start (hb_font_t *font,
984 hb_buffer_t *buffer)
985 {
986 _hb_ot_layout_set_glyph_props (font, buffer);
987 }
988
989 void
990 hb_ot_layout_delete_glyphs_inplace (hb_buffer_t *buffer,
991 bool (*filter) (const hb_glyph_info_t *info))
992 {
993 /* Merge clusters and delete filtered glyphs.
994 * NOTE! We can't use out-buffer as we have positioning data. */
995 unsigned int j = 0;
996 unsigned int count = buffer->len;
997 hb_glyph_info_t *info = buffer->info;
998 hb_glyph_position_t *pos = buffer->pos;
999 for (unsigned int i = 0; i < count; i++)
1000 {
1001 if (filter (&info[i]))
1002 {
1003 /* Merge clusters.
1004 * Same logic as buffer->delete_glyph(), but for in-place removal. */
1005
1006 unsigned int cluster = info[i].cluster;
1007 if (i + 1 < count && cluster == info[i + 1].cluster)
1008 continue; /* Cluster survives; do nothing. */
1009
1010 if (j)
1011 {
1012 /* Merge cluster backward. */
1013 if (cluster < info[j - 1].cluster)
1014 {
1015 unsigned int mask = info[i].mask;
1016 unsigned int old_cluster = info[j - 1].cluster;
1017 for (unsigned k = j; k && info[k - 1].cluster == old_cluster; k--)
1018 buffer->set_cluster (info[k - 1], cluster, mask);
1019 }
1020 continue;
1021 }
1022
1023 if (i + 1 < count)
1024 buffer->merge_clusters (i, i + 2); /* Merge cluster forward. */
1025
1026 continue;
1027 }
1028
1029 if (j != i)
1030 {
1031 info[j] = info[i];
1032 pos[j] = pos[i];
1033 }
1034 j++;
1035 }
1036 buffer->len = j;
1037 }
1038
1039 /**
1040 * hb_ot_layout_lookup_substitute_closure:
1041 *
1042 * Since: 0.9.7
1043 **/
1044 void
1045 hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
1046 unsigned int lookup_index,
1047 hb_set_t *glyphs)
1048 {
1049 hb_map_t done_lookups;
1050 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
1051
1052 const OT::SubstLookup& l = face->table.GSUB->table->get_lookup (lookup_index);
1053
1054 l.closure (&c, lookup_index);
1055 }
1056
1057 /**
1058 * hb_ot_layout_lookups_substitute_closure:
1059 *
1060 * Compute the transitive closure of glyphs needed for all of the
1061 * provided lookups.
1062 *
1063 * Since: 1.8.1
1064 **/
1065 void
1066 hb_ot_layout_lookups_substitute_closure (hb_face_t *face,
1067 const hb_set_t *lookups,
1068 hb_set_t *glyphs)
1069 {
1070 hb_map_t done_lookups;
1071 OT::hb_closure_context_t c (face, glyphs, &done_lookups);
1072 const OT::GSUB& gsub = *face->table.GSUB->table;
1073
1074 unsigned int iteration_count = 0;
1075 unsigned int glyphs_length;
1076 do
1077 {
1078 glyphs_length = glyphs->get_population ();
1079 if (lookups != nullptr)
1080 {
1081 for (hb_codepoint_t lookup_index = HB_SET_VALUE_INVALID; hb_set_next (lookups, &lookup_index);)
1082 gsub.get_lookup (lookup_index).closure (&c, lookup_index);
1083 }
1084 else
1085 {
1086 for (unsigned int i = 0; i < gsub.get_lookup_count (); i++)
1087 gsub.get_lookup (i).closure (&c, i);
1088 }
1089 } while (iteration_count++ <= HB_CLOSURE_MAX_STAGES &&
1090 glyphs_length != glyphs->get_population ());
1091 }
1092
1093 /*
1094 * OT::GPOS
1095 */
1096
1097 hb_bool_t
1098 hb_ot_layout_has_positioning (hb_face_t *face)
1099 {
1100 return face->table.GPOS->table->has_data ();
1101 }
1102
1103 void
1104 hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
1105 {
1106 OT::GPOS::position_start (font, buffer);
1107 }
1108
1109 void
1110 hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
1111 {
1112 OT::GPOS::position_finish_advances (font, buffer);
1113 }
1114
1115 void
1116 hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
1117 {
1118 OT::GPOS::position_finish_offsets (font, buffer);
1119 }
1120
1121 /**
1122 * hb_ot_layout_get_size_params:
1123 *
1124 * Since: 0.9.10
1125 **/
1126 hb_bool_t
1127 hb_ot_layout_get_size_params (hb_face_t *face,
1128 unsigned int *design_size, /* OUT. May be NULL */
1129 unsigned int *subfamily_id, /* OUT. May be NULL */
1130 hb_ot_name_id_t *subfamily_name_id, /* OUT. May be NULL */
1131 unsigned int *range_start, /* OUT. May be NULL */
1132 unsigned int *range_end /* OUT. May be NULL */)
1133 {
1134 const OT::GPOS &gpos = *face->table.GPOS->table;
1135 const hb_tag_t tag = HB_TAG ('s','i','z','e');
1136
1137 unsigned int num_features = gpos.get_feature_count ();
1138 for (unsigned int i = 0; i < num_features; i++)
1139 {
1140 if (tag == gpos.get_feature_tag (i))
1141 {
1142 const OT::Feature &f = gpos.get_feature (i);
1143 const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag);
1144
1145 if (params.designSize)
1146 {
1147 if (design_size) *design_size = params.designSize;
1148 if (subfamily_id) *subfamily_id = params.subfamilyID;
1149 if (subfamily_name_id) *subfamily_name_id = params.subfamilyNameID;
1150 if (range_start) *range_start = params.rangeStart;
1151 if (range_end) *range_end = params.rangeEnd;
1152
1153 return true;
1154 }
1155 }
1156 }
1157
1158 if (design_size) *design_size = 0;
1159 if (subfamily_id) *subfamily_id = 0;
1160 if (subfamily_name_id) *subfamily_name_id = HB_OT_NAME_ID_INVALID;
1161 if (range_start) *range_start = 0;
1162 if (range_end) *range_end = 0;
1163
1164 return false;
1165 }
1166
1167 /**
1168 * hb_ot_layout_feature_get_name_ids:
1169 * @face: #hb_face_t to work upon
1170 * @table_tag: table tag to query, "GSUB" or "GPOS".
1171 * @feature_index: index of feature to query.
1172 * @label_id: (out) (allow-none): The ‘name’ table name ID that specifies a string
1173 * for a user-interface label for this feature. (May be NULL.)
1174 * @tooltip_id: (out) (allow-none): The ‘name’ table name ID that specifies a string
1175 * that an application can use for tooltip text for this
1176 * feature. (May be NULL.)
1177 * @sample_id: (out) (allow-none): The ‘name’ table name ID that specifies sample text
1178 * that illustrates the effect of this feature. (May be NULL.)
1179 * @num_named_parameters: (out) (allow-none): Number of named parameters. (May be zero.)
1180 * @first_param_id: (out) (allow-none): The first ‘name’ table name ID used to specify
1181 * strings for user-interface labels for the feature
1182 * parameters. (Must be zero if numParameters is zero.)
1183 *
1184 * Fetches name indices from feature parameters for "Stylistic Set" ('ssXX') or
1185 * "Character Variant" ('cvXX') features.
1186 *
1187 * Return value: true if data found, false otherwise
1188 *
1189 * Since: 2.0.0
1190 **/
1191 hb_bool_t
1192 hb_ot_layout_feature_get_name_ids (hb_face_t *face,
1193 hb_tag_t table_tag,
1194 unsigned int feature_index,
1195 hb_ot_name_id_t *label_id, /* OUT. May be NULL */
1196 hb_ot_name_id_t *tooltip_id, /* OUT. May be NULL */
1197 hb_ot_name_id_t *sample_id, /* OUT. May be NULL */
1198 unsigned int *num_named_parameters, /* OUT. May be NULL */
1199 hb_ot_name_id_t *first_param_id /* OUT. May be NULL */)
1200 {
1201 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
1202
1203 hb_tag_t feature_tag = g.get_feature_tag (feature_index);
1204 const OT::Feature &f = g.get_feature (feature_index);
1205
1206 const OT::FeatureParams &feature_params = f.get_feature_params ();
1207 if (&feature_params != &Null (OT::FeatureParams))
1208 {
1209 const OT::FeatureParamsStylisticSet& ss_params =
1210 feature_params.get_stylistic_set_params (feature_tag);
1211 if (&ss_params != &Null (OT::FeatureParamsStylisticSet)) /* ssXX */
1212 {
1213 if (label_id) *label_id = ss_params.uiNameID;
1214 // ssXX features don't have the rest
1215 if (tooltip_id) *tooltip_id = HB_OT_NAME_ID_INVALID;
1216 if (sample_id) *sample_id = HB_OT_NAME_ID_INVALID;
1217 if (num_named_parameters) *num_named_parameters = 0;
1218 if (first_param_id) *first_param_id = HB_OT_NAME_ID_INVALID;
1219 return true;
1220 }
1221 const OT::FeatureParamsCharacterVariants& cv_params =
1222 feature_params.get_character_variants_params (feature_tag);
1223 if (&cv_params != &Null (OT::FeatureParamsCharacterVariants)) /* cvXX */
1224 {
1225 if (label_id) *label_id = cv_params.featUILableNameID;
1226 if (tooltip_id) *tooltip_id = cv_params.featUITooltipTextNameID;
1227 if (sample_id) *sample_id = cv_params.sampleTextNameID;
1228 if (num_named_parameters) *num_named_parameters = cv_params.numNamedParameters;
1229 if (first_param_id) *first_param_id = cv_params.firstParamUILabelNameID;
1230 return true;
1231 }
1232 }
1233
1234 if (label_id) *label_id = HB_OT_NAME_ID_INVALID;
1235 if (tooltip_id) *tooltip_id = HB_OT_NAME_ID_INVALID;
1236 if (sample_id) *sample_id = HB_OT_NAME_ID_INVALID;
1237 if (num_named_parameters) *num_named_parameters = 0;
1238 if (first_param_id) *first_param_id = HB_OT_NAME_ID_INVALID;
1239 return false;
1240 }
1241
1242 /**
1243 * hb_ot_layout_feature_get_characters:
1244 * @face: #hb_face_t to work upon
1245 * @table_tag: table tag to query, "GSUB" or "GPOS".
1246 * @feature_index: index of feature to query.
1247 * @start_offset: In case the resulting char_count was equal to its input value, there
1248 * is a chance there were more characters on the tag so this API can be
1249 * called with an offset till resulting char_count gets to a number
1250 * lower than input buffer (or consider using just a bigger buffer for
1251 * one shot copying).
1252 * @char_count: (inout) (allow-none): The count of characters for which this feature
1253 * provides glyph variants. (May be zero.)
1254 * @characters: (out caller-allocates) (array length=char_count): A buffer pointer. The Unicode codepoints
1255 * of the characters for which this feature provides glyph variants.
1256 *
1257 * Fetches characters listed by designer under feature parameters for "Character
1258 * Variant" ("cvXX") features.
1259 *
1260 * Return value: Number of total sample characters in the cvXX feature.
1261 *
1262 * Since: 2.0.0
1263 **/
1264 unsigned int
1265 hb_ot_layout_feature_get_characters (hb_face_t *face,
1266 hb_tag_t table_tag,
1267 unsigned int feature_index,
1268 unsigned int start_offset,
1269 unsigned int *char_count, /* IN/OUT. May be NULL */
1270 hb_codepoint_t *characters /* OUT. May be NULL */)
1271 {
1272 const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
1273
1274 hb_tag_t feature_tag = g.get_feature_tag (feature_index);
1275 const OT::Feature &f = g.get_feature (feature_index);
1276
1277 const OT::FeatureParams &feature_params = f.get_feature_params ();
1278
1279 const OT::FeatureParamsCharacterVariants& cv_params =
1280 feature_params.get_character_variants_params(feature_tag);
1281
1282 unsigned int len = 0;
1283 if (char_count && characters && start_offset < cv_params.characters.len)
1284 {
1285 len = MIN (cv_params.characters.len - start_offset, *char_count);
1286 for (unsigned int i = 0; i < len; ++i)
1287 characters[i] = cv_params.characters[start_offset + i];
1288 }
1289 if (char_count) *char_count = len;
1290 return cv_params.characters.len;
1291 }
1292
1293
1294 /*
1295 * Parts of different types are implemented here such that they have direct
1296 * access to GSUB/GPOS lookups.
1297 */
1298
1299
1300 struct GSUBProxy
1301 {
1302 static constexpr unsigned table_index = 0u;
1303 static constexpr bool inplace = false;
1304 typedef OT::SubstLookup Lookup;
1305
1306 GSUBProxy (hb_face_t *face) :
1307 table (*face->table.GSUB->table),
1308 accels (face->table.GSUB->accels) {}
1309
1310 const OT::GSUB &table;
1311 const OT::hb_ot_layout_lookup_accelerator_t *accels;
1312 };
1313
1314 struct GPOSProxy
1315 {
1316 static constexpr unsigned table_index = 1u;
1317 static constexpr bool inplace = true;
1318 typedef OT::PosLookup Lookup;
1319
1320 GPOSProxy (hb_face_t *face) :
1321 table (*face->table.GPOS->table),
1322 accels (face->table.GPOS->accels) {}
1323
1324 const OT::GPOS &table;
1325 const OT::hb_ot_layout_lookup_accelerator_t *accels;
1326 };
1327
1328
1329 static inline bool
1330 apply_forward (OT::hb_ot_apply_context_t *c,
1331 const OT::hb_ot_layout_lookup_accelerator_t &accel)
1332 {
1333 bool ret = false;
1334 hb_buffer_t *buffer = c->buffer;
1335 while (buffer->idx < buffer->len && buffer->successful)
1336 {
1337 bool applied = false;
1338 if (accel.may_have (buffer->cur().codepoint) &&
1339 (buffer->cur().mask & c->lookup_mask) &&
1340 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1341 {
1342 applied = accel.apply (c);
1343 }
1344
1345 if (applied)
1346 ret = true;
1347 else
1348 buffer->next_glyph ();
1349 }
1350 return ret;
1351 }
1352
1353 static inline bool
1354 apply_backward (OT::hb_ot_apply_context_t *c,
1355 const OT::hb_ot_layout_lookup_accelerator_t &accel)
1356 {
1357 bool ret = false;
1358 hb_buffer_t *buffer = c->buffer;
1359 do
1360 {
1361 if (accel.may_have (buffer->cur().codepoint) &&
1362 (buffer->cur().mask & c->lookup_mask) &&
1363 c->check_glyph_property (&buffer->cur(), c->lookup_props))
1364 ret |= accel.apply (c);
1365
1366 /* The reverse lookup doesn't "advance" cursor (for good reason). */
1367 buffer->idx--;
1368
1369 }
1370 while ((int) buffer->idx >= 0);
1371 return ret;
1372 }
1373
1374 template <typename Proxy>
1375 static inline void
1376 apply_string (OT::hb_ot_apply_context_t *c,
1377 const typename Proxy::Lookup &lookup,
1378 const OT::hb_ot_layout_lookup_accelerator_t &accel)
1379 {
1380 hb_buffer_t *buffer = c->buffer;
1381
1382 if (unlikely (!buffer->len || !c->lookup_mask))
1383 return;
1384
1385 c->set_lookup_props (lookup.get_props ());
1386
1387 if (likely (!lookup.is_reverse ()))
1388 {
1389 /* in/out forward substitution/positioning */
1390 if (Proxy::table_index == 0u)
1391 buffer->clear_output ();
1392 buffer->idx = 0;
1393
1394 bool ret;
1395 ret = apply_forward (c, accel);
1396 if (ret)
1397 {
1398 if (!Proxy::inplace)
1399 buffer->swap_buffers ();
1400 else
1401 assert (!buffer->has_separate_output ());
1402 }
1403 }
1404 else
1405 {
1406 /* in-place backward substitution/positioning */
1407 if (Proxy::table_index == 0u)
1408 buffer->remove_output ();
1409 buffer->idx = buffer->len - 1;
1410
1411 apply_backward (c, accel);
1412 }
1413 }
1414
1415 template <typename Proxy>
1416 inline void hb_ot_map_t::apply (const Proxy &proxy,
1417 const hb_ot_shape_plan_t *plan,
1418 hb_font_t *font,
1419 hb_buffer_t *buffer) const
1420 {
1421 const unsigned int table_index = proxy.table_index;
1422 unsigned int i = 0;
1423 OT::hb_ot_apply_context_t c (table_index, font, buffer);
1424 c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
1425
1426 for (unsigned int stage_index = 0; stage_index < stages[table_index].length; stage_index++) {
1427 const stage_map_t *stage = &stages[table_index][stage_index];
1428 for (; i < stage->last_lookup; i++)
1429 {
1430 unsigned int lookup_index = lookups[table_index][i].index;
1431 if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
1432 c.set_lookup_index (lookup_index);
1433 c.set_lookup_mask (lookups[table_index][i].mask);
1434 c.set_auto_zwj (lookups[table_index][i].auto_zwj);
1435 c.set_auto_zwnj (lookups[table_index][i].auto_zwnj);
1436 if (lookups[table_index][i].random)
1437 {
1438 c.set_random (true);
1439 buffer->unsafe_to_break_all ();
1440 }
1441 apply_string<Proxy> (&c,
1442 proxy.table.get_lookup (lookup_index),
1443 proxy.accels[lookup_index]);
1444 (void) buffer->message (font, "end lookup %d", lookup_index);
1445 }
1446
1447 if (stage->pause_func)
1448 {
1449 buffer->clear_output ();
1450 stage->pause_func (plan, font, buffer);
1451 }
1452 }
1453 }
1454
1455 void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1456 {
1457 GSUBProxy proxy (font->face);
1458 apply (proxy, plan, font, buffer);
1459 }
1460
1461 void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1462 {
1463 GPOSProxy proxy (font->face);
1464 apply (proxy, plan, font, buffer);
1465 }
1466
1467 void
1468 hb_ot_layout_substitute_lookup (OT::hb_ot_apply_context_t *c,
1469 const OT::SubstLookup &lookup,
1470 const OT::hb_ot_layout_lookup_accelerator_t &accel)
1471 {
1472 apply_string<GSUBProxy> (c, lookup, accel);
1473 }
1474
1475 #if 0
1476 static const OT::BASE& _get_base (hb_face_t *face)
1477 {
1478 return *face->table.BASE;
1479 }
1480
1481 hb_bool_t
1482 hb_ot_layout_get_baseline (hb_font_t *font,
1483 hb_ot_layout_baseline_t baseline,
1484 hb_direction_t direction,
1485 hb_tag_t script_tag,
1486 hb_tag_t language_tag,
1487 hb_position_t *coord /* OUT. May be NULL. */)
1488 {
1489 const OT::BASE &base = _get_base (font->face);
1490 bool result = base.get_baseline (font, baseline, direction, script_tag,
1491 language_tag, coord);
1492
1493 /* TODO: Simulate https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags#ideographic-em-box */
1494 if (!result && coord) *coord = 0;
1495
1496 if (coord) *coord = font->em_scale_dir (*coord, direction);
1497
1498 return result;
1499 }
1500
1501 /* To be moved to public header */
1502 /*
1503 * BASE
1504 */
1505
1506 /**
1507 * hb_ot_layout_baseline_t:
1508 *
1509 * https://docs.microsoft.com/en-us/typography/opentype/spec/baselinetags
1510 *
1511 * Since: DONTREPLACEME
1512 */
1513 typedef enum {
1514 HB_OT_LAYOUT_BASELINE_HANG = HB_TAG('h','a','n','g'),
1515 HB_OT_LAYOUT_BASELINE_ICFB = HB_TAG('i','c','f','b'),
1516 HB_OT_LAYOUT_BASELINE_ICFT = HB_TAG('i','c','f','t'),
1517 HB_OT_LAYOUT_BASELINE_IDEO = HB_TAG('i','d','e','o'),
1518 HB_OT_LAYOUT_BASELINE_IDTB = HB_TAG('i','d','t','b'),
1519 HB_OT_LAYOUT_BASELINE_MATH = HB_TAG('m','a','t','h'),
1520 HB_OT_LAYOUT_BASELINE_ROMN = HB_TAG('r','o','m','n')
1521 } hb_ot_layout_baseline_t;
1522
1523 HB_EXTERN hb_bool_t
1524 hb_ot_layout_get_baseline (hb_font_t *font,
1525 hb_ot_layout_baseline_t baseline,
1526 hb_direction_t direction,
1527 hb_tag_t script_tag,
1528 hb_tag_t language_tag,
1529 hb_position_t *coord /* OUT. May be NULL. */);
1530
1531 #endif
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