Line data Source code
1 : /*
2 : * Copyright © 1998-2004 David Turner and Werner Lemberg
3 : * Copyright © 2006 Behdad Esfahbod
4 : * Copyright © 2007,2008,2009 Red Hat, Inc.
5 : * Copyright © 2012,2013 Google, Inc.
6 : *
7 : * This is part of HarfBuzz, a text shaping library.
8 : *
9 : * Permission is hereby granted, without written agreement and without
10 : * license or royalty fees, to use, copy, modify, and distribute this
11 : * software and its documentation for any purpose, provided that the
12 : * above copyright notice and the following two paragraphs appear in
13 : * all copies of this software.
14 : *
15 : * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
16 : * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
17 : * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
18 : * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 : * DAMAGE.
20 : *
21 : * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
22 : * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
23 : * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
24 : * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
25 : * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
26 : *
27 : * Red Hat Author(s): Behdad Esfahbod
28 : * Google Author(s): Behdad Esfahbod
29 : */
30 :
31 : #include "hb-open-type-private.hh"
32 : #include "hb-ot-layout-private.hh"
33 :
34 : #include "hb-ot-layout-gdef-table.hh"
35 : #include "hb-ot-layout-gsub-table.hh"
36 : #include "hb-ot-layout-gpos-table.hh"
37 : #include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise.
38 :
39 : #include "hb-ot-map-private.hh"
40 :
41 :
42 : hb_ot_layout_t *
43 4 : _hb_ot_layout_create (hb_face_t *face)
44 : {
45 4 : hb_ot_layout_t *layout = (hb_ot_layout_t *) calloc (1, sizeof (hb_ot_layout_t));
46 4 : if (unlikely (!layout))
47 0 : return NULL;
48 :
49 4 : layout->gdef_blob = OT::Sanitizer<OT::GDEF>::sanitize (face->reference_table (HB_OT_TAG_GDEF));
50 4 : layout->gdef = OT::Sanitizer<OT::GDEF>::lock_instance (layout->gdef_blob);
51 :
52 4 : layout->gsub_blob = OT::Sanitizer<OT::GSUB>::sanitize (face->reference_table (HB_OT_TAG_GSUB));
53 4 : layout->gsub = OT::Sanitizer<OT::GSUB>::lock_instance (layout->gsub_blob);
54 :
55 4 : layout->gpos_blob = OT::Sanitizer<OT::GPOS>::sanitize (face->reference_table (HB_OT_TAG_GPOS));
56 4 : layout->gpos = OT::Sanitizer<OT::GPOS>::lock_instance (layout->gpos_blob);
57 :
58 4 : layout->math.init (face);
59 4 : layout->fvar.init (face);
60 4 : layout->avar.init (face);
61 :
62 : {
63 : /*
64 : * The ugly business of blacklisting individual fonts' tables happen here!
65 : * See this thread for why we finally had to bend in and do this:
66 : * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
67 : */
68 4 : unsigned int gdef_len = hb_blob_get_length (layout->gdef_blob);
69 4 : unsigned int gsub_len = hb_blob_get_length (layout->gsub_blob);
70 4 : unsigned int gpos_len = hb_blob_get_length (layout->gpos_blob);
71 4 : if (0
72 : /* sha1sum:c5ee92f0bca4bfb7d06c4d03e8cf9f9cf75d2e8a Windows 7? timesi.ttf */
73 0 : || (442 == gdef_len && 42038 == gpos_len && 2874 == gsub_len)
74 : /* sha1sum:37fc8c16a0894ab7b749e35579856c73c840867b Windows 7? timesbi.ttf */
75 4 : || (430 == gdef_len && 40662 == gpos_len && 2874 == gsub_len)
76 : /* sha1sum:19fc45110ea6cd3cdd0a5faca256a3797a069a80 Windows 7 timesi.ttf */
77 4 : || (442 == gdef_len && 39116 == gpos_len && 2874 == gsub_len)
78 : /* sha1sum:6d2d3c9ed5b7de87bc84eae0df95ee5232ecde26 Windows 7 timesbi.ttf */
79 4 : || (430 == gdef_len && 39374 == gpos_len && 2874 == gsub_len)
80 : /* sha1sum:8583225a8b49667c077b3525333f84af08c6bcd8 OS X 10.11.3 Times New Roman Italic.ttf */
81 4 : || (490 == gdef_len && 41638 == gpos_len && 3046 == gsub_len)
82 : /* sha1sum:ec0f5a8751845355b7c3271d11f9918a966cb8c9 OS X 10.11.3 Times New Roman Bold Italic.ttf */
83 4 : || (478 == gdef_len && 41902 == gpos_len && 3046 == gsub_len)
84 : )
85 : {
86 : /* In certain versions of Times New Roman Italic and Bold Italic,
87 : * ASCII double quotation mark U+0022, mapped to glyph 5, has wrong
88 : * glyph class 3 (mark) in GDEF. Nuke the GDEF to avoid zero-width
89 : * double-quote. See:
90 : * https://lists.freedesktop.org/archives/harfbuzz/2016-February/005489.html
91 : */
92 0 : if (3 == layout->gdef->get_glyph_class (5))
93 0 : layout->gdef = &OT::Null(OT::GDEF);
94 : }
95 4 : else if (0
96 : /* sha1sum:96eda93f7d33e79962451c6c39a6b51ee893ce8c tahoma.ttf from Windows 8 */
97 0 : || (898 == gdef_len && 46470 == gpos_len && 12554 == gsub_len)
98 : /* sha1sum:20928dc06014e0cd120b6fc942d0c3b1a46ac2bc tahomabd.ttf from Windows 8 */
99 4 : || (910 == gdef_len && 47732 == gpos_len && 12566 == gsub_len)
100 : /* sha1sum:4f95b7e4878f60fa3a39ca269618dfde9721a79e tahoma.ttf from Windows 8.1 */
101 4 : || (928 == gdef_len && 59332 == gpos_len && 23298 == gsub_len)
102 : /* sha1sum:6d400781948517c3c0441ba42acb309584b73033 tahomabd.ttf from Windows 8.1 */
103 4 : || (940 == gdef_len && 60732 == gpos_len && 23310 == gsub_len)
104 : /* tahoma.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
105 4 : || (964 == gdef_len && 60072 == gpos_len && 23836 == gsub_len)
106 : /* tahomabd.ttf v6.04 from Windows 8.1 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
107 4 : || (976 == gdef_len && 61456 == gpos_len && 23832 == gsub_len)
108 : /* sha1sum:e55fa2dfe957a9f7ec26be516a0e30b0c925f846 tahoma.ttf from Windows 10 */
109 4 : || (994 == gdef_len && 60336 == gpos_len && 24474 == gsub_len)
110 : /* sha1sum:7199385abb4c2cc81c83a151a7599b6368e92343 tahomabd.ttf from Windows 10 */
111 4 : || (1006 == gdef_len && 61740 == gpos_len && 24470 == gsub_len)
112 : /* tahoma.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
113 4 : || (1006 == gdef_len && 61346 == gpos_len && 24576 == gsub_len)
114 : /* tahomabd.ttf v6.91 from Windows 10 x64, see https://bugzilla.mozilla.org/show_bug.cgi?id=1279925 */
115 4 : || (1018 == gdef_len && 62828 == gpos_len && 24572 == gsub_len)
116 : /* sha1sum:b9c84d820c49850d3d27ec498be93955b82772b5 tahoma.ttf from Windows 10 AU */
117 4 : || (1006 == gdef_len && 61352 == gpos_len && 24576 == gsub_len)
118 : /* sha1sum:2bdfaab28174bdadd2f3d4200a30a7ae31db79d2 tahomabd.ttf from Windows 10 AU */
119 4 : || (1018 == gdef_len && 62834 == gpos_len && 24572 == gsub_len)
120 : /* sha1sum:b0d36cf5a2fbe746a3dd277bffc6756a820807a7 Tahoma.ttf from Mac OS X 10.9 */
121 4 : || (832 == gdef_len && 47162 == gpos_len && 7324 == gsub_len)
122 : /* sha1sum:12fc4538e84d461771b30c18b5eb6bd434e30fba Tahoma Bold.ttf from Mac OS X 10.9 */
123 4 : || (844 == gdef_len && 45474 == gpos_len && 7302 == gsub_len)
124 : /* sha1sum:eb8afadd28e9cf963e886b23a30b44ab4fd83acc himalaya.ttf from Windows 7 */
125 4 : || (180 == gdef_len && 7254 == gpos_len && 13054 == gsub_len)
126 : /* sha1sum:73da7f025b238a3f737aa1fde22577a6370f77b0 himalaya.ttf from Windows 8 */
127 4 : || (192 == gdef_len && 7254 == gpos_len && 12638 == gsub_len)
128 : /* sha1sum:6e80fd1c0b059bbee49272401583160dc1e6a427 himalaya.ttf from Windows 8.1 */
129 4 : || (192 == gdef_len && 7254 == gpos_len && 12690 == gsub_len)
130 : /* 8d9267aea9cd2c852ecfb9f12a6e834bfaeafe44 cantarell-fonts-0.0.21/otf/Cantarell-Regular.otf */
131 : /* 983988ff7b47439ab79aeaf9a45bd4a2c5b9d371 cantarell-fonts-0.0.21/otf/Cantarell-Oblique.otf */
132 4 : || (188 == gdef_len && 3852 == gpos_len && 248 == gsub_len)
133 : /* 2c0c90c6f6087ffbfea76589c93113a9cbb0e75f cantarell-fonts-0.0.21/otf/Cantarell-Bold.otf */
134 : /* 55461f5b853c6da88069ffcdf7f4dd3f8d7e3e6b cantarell-fonts-0.0.21/otf/Cantarell-Bold-Oblique.otf */
135 4 : || (188 == gdef_len && 3426 == gpos_len && 264 == gsub_len)
136 : /* d125afa82a77a6475ac0e74e7c207914af84b37a padauk-2.80/Padauk.ttf RHEL 7.2 */
137 4 : || (1058 == gdef_len && 11818 == gpos_len && 47032 == gsub_len)
138 : /* 0f7b80437227b90a577cc078c0216160ae61b031 padauk-2.80/Padauk-Bold.ttf RHEL 7.2*/
139 4 : || (1046 == gdef_len && 12600 == gpos_len && 47030 == gsub_len)
140 : /* d3dde9aa0a6b7f8f6a89ef1002e9aaa11b882290 padauk-2.80/Padauk.ttf Ubuntu 16.04 */
141 4 : || (1058 == gdef_len && 16770 == gpos_len && 71796 == gsub_len)
142 : /* 5f3c98ccccae8a953be2d122c1b3a77fd805093f padauk-2.80/Padauk-Bold.ttf Ubuntu 16.04 */
143 4 : || (1046 == gdef_len && 17862 == gpos_len && 71790 == gsub_len)
144 : /* 6c93b63b64e8b2c93f5e824e78caca555dc887c7 padauk-2.80/Padauk-book.ttf */
145 4 : || (1046 == gdef_len && 17112 == gpos_len && 71788 == gsub_len)
146 : /* d89b1664058359b8ec82e35d3531931125991fb9 padauk-2.80/Padauk-bookbold.ttf */
147 4 : || (1058 == gdef_len && 17514 == gpos_len && 71794 == gsub_len)
148 : /* 824cfd193aaf6234b2b4dc0cf3c6ef576c0d00ef padauk-3.0/Padauk-book.ttf */
149 4 : || (1330 == gdef_len && 57938 == gpos_len && 109904 == gsub_len)
150 : /* 91fcc10cf15e012d27571e075b3b4dfe31754a8a padauk-3.0/Padauk-bookbold.ttf */
151 4 : || (1330 == gdef_len && 58972 == gpos_len && 109904 == gsub_len)
152 : /* sha1sum: c26e41d567ed821bed997e937bc0c41435689e85 Padauk.ttf
153 : * "Padauk Regular" "Version 2.5", see https://crbug.com/681813 */
154 4 : || (1004 == gdef_len && 14836 == gpos_len && 59092 == gsub_len)
155 : )
156 : {
157 : /* Many versions of Tahoma have bad GDEF tables that incorrectly classify some spacing marks
158 : * such as certain IPA symbols as glyph class 3. So do older versions of Microsoft Himalaya,
159 : * and the version of Cantarell shipped by Ubuntu 16.04.
160 : * Nuke the GDEF tables of these fonts to avoid unwanted width-zeroing.
161 : * See https://bugzilla.mozilla.org/show_bug.cgi?id=1279925
162 : * https://bugzilla.mozilla.org/show_bug.cgi?id=1279693
163 : * https://bugzilla.mozilla.org/show_bug.cgi?id=1279875
164 : */
165 0 : layout->gdef = &OT::Null(OT::GDEF);
166 : }
167 : }
168 :
169 4 : layout->gsub_lookup_count = layout->gsub->get_lookup_count ();
170 4 : layout->gpos_lookup_count = layout->gpos->get_lookup_count ();
171 :
172 4 : layout->gsub_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gsub->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
173 4 : layout->gpos_accels = (hb_ot_layout_lookup_accelerator_t *) calloc (layout->gpos->get_lookup_count (), sizeof (hb_ot_layout_lookup_accelerator_t));
174 :
175 4 : if (unlikely ((layout->gsub_lookup_count && !layout->gsub_accels) ||
176 : (layout->gpos_lookup_count && !layout->gpos_accels)))
177 : {
178 0 : _hb_ot_layout_destroy (layout);
179 0 : return NULL;
180 : }
181 :
182 82 : for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
183 78 : layout->gsub_accels[i].init (layout->gsub->get_lookup (i));
184 28 : for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
185 24 : layout->gpos_accels[i].init (layout->gpos->get_lookup (i));
186 :
187 4 : return layout;
188 : }
189 :
190 : void
191 2 : _hb_ot_layout_destroy (hb_ot_layout_t *layout)
192 : {
193 41 : for (unsigned int i = 0; i < layout->gsub_lookup_count; i++)
194 39 : layout->gsub_accels[i].fini ();
195 14 : for (unsigned int i = 0; i < layout->gpos_lookup_count; i++)
196 12 : layout->gpos_accels[i].fini ();
197 :
198 2 : free (layout->gsub_accels);
199 2 : free (layout->gpos_accels);
200 :
201 2 : hb_blob_destroy (layout->gdef_blob);
202 2 : hb_blob_destroy (layout->gsub_blob);
203 2 : hb_blob_destroy (layout->gpos_blob);
204 :
205 2 : layout->math.fini ();
206 2 : layout->fvar.fini ();
207 2 : layout->avar.fini ();
208 :
209 2 : free (layout);
210 2 : }
211 :
212 : static inline const OT::GDEF&
213 68 : _get_gdef (hb_face_t *face)
214 : {
215 68 : if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GDEF);
216 68 : return *hb_ot_layout_from_face (face)->gdef;
217 : }
218 : static inline const OT::GSUB&
219 606 : _get_gsub (hb_face_t *face)
220 : {
221 606 : if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GSUB);
222 606 : return *hb_ot_layout_from_face (face)->gsub;
223 : }
224 : static inline const OT::GPOS&
225 280 : _get_gpos (hb_face_t *face)
226 : {
227 280 : if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return OT::Null(OT::GPOS);
228 280 : return *hb_ot_layout_from_face (face)->gpos;
229 : }
230 :
231 : /*
232 : * GDEF
233 : */
234 :
235 : hb_bool_t
236 68 : hb_ot_layout_has_glyph_classes (hb_face_t *face)
237 : {
238 68 : return _get_gdef (face).has_glyph_classes ();
239 : }
240 :
241 : /**
242 : * hb_ot_layout_get_glyph_class:
243 : *
244 : * Since: 0.9.7
245 : **/
246 : hb_ot_layout_glyph_class_t
247 0 : hb_ot_layout_get_glyph_class (hb_face_t *face,
248 : hb_codepoint_t glyph)
249 : {
250 0 : return (hb_ot_layout_glyph_class_t) _get_gdef (face).get_glyph_class (glyph);
251 : }
252 :
253 : /**
254 : * hb_ot_layout_get_glyphs_in_class:
255 : *
256 : * Since: 0.9.7
257 : **/
258 : void
259 0 : hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
260 : hb_ot_layout_glyph_class_t klass,
261 : hb_set_t *glyphs /* OUT */)
262 : {
263 0 : return _get_gdef (face).get_glyphs_in_class (klass, glyphs);
264 : }
265 :
266 : unsigned int
267 0 : hb_ot_layout_get_attach_points (hb_face_t *face,
268 : hb_codepoint_t glyph,
269 : unsigned int start_offset,
270 : unsigned int *point_count /* IN/OUT */,
271 : unsigned int *point_array /* OUT */)
272 : {
273 0 : return _get_gdef (face).get_attach_points (glyph, start_offset, point_count, point_array);
274 : }
275 :
276 : unsigned int
277 0 : hb_ot_layout_get_ligature_carets (hb_font_t *font,
278 : hb_direction_t direction,
279 : hb_codepoint_t glyph,
280 : unsigned int start_offset,
281 : unsigned int *caret_count /* IN/OUT */,
282 : int *caret_array /* OUT */)
283 : {
284 0 : return _get_gdef (font->face).get_lig_carets (font, direction, glyph, start_offset, caret_count, caret_array);
285 : }
286 :
287 :
288 : /*
289 : * GSUB/GPOS
290 : */
291 :
292 : static const OT::GSUBGPOS&
293 848 : get_gsubgpos_table (hb_face_t *face,
294 : hb_tag_t table_tag)
295 : {
296 848 : switch (table_tag) {
297 604 : case HB_OT_TAG_GSUB: return _get_gsub (face);
298 244 : case HB_OT_TAG_GPOS: return _get_gpos (face);
299 0 : default: return OT::Null(OT::GSUBGPOS);
300 : }
301 : }
302 :
303 :
304 : unsigned int
305 4 : hb_ot_layout_table_get_script_tags (hb_face_t *face,
306 : hb_tag_t table_tag,
307 : unsigned int start_offset,
308 : unsigned int *script_count /* IN/OUT */,
309 : hb_tag_t *script_tags /* OUT */)
310 : {
311 4 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
312 :
313 4 : return g.get_script_tags (start_offset, script_count, script_tags);
314 : }
315 :
316 : #define HB_OT_TAG_LATIN_SCRIPT HB_TAG ('l', 'a', 't', 'n')
317 :
318 : hb_bool_t
319 0 : hb_ot_layout_table_find_script (hb_face_t *face,
320 : hb_tag_t table_tag,
321 : hb_tag_t script_tag,
322 : unsigned int *script_index)
323 : {
324 : ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
325 0 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
326 :
327 0 : if (g.find_script_index (script_tag, script_index))
328 0 : return true;
329 :
330 : /* try finding 'DFLT' */
331 0 : if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index))
332 0 : return false;
333 :
334 : /* try with 'dflt'; MS site has had typos and many fonts use it now :(.
335 : * including many versions of DejaVu Sans Mono! */
336 0 : if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index))
337 0 : return false;
338 :
339 : /* try with 'latn'; some old fonts put their features there even though
340 : they're really trying to support Thai, for example :( */
341 0 : if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index))
342 0 : return false;
343 :
344 0 : if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
345 0 : return false;
346 : }
347 :
348 : hb_bool_t
349 4 : hb_ot_layout_table_choose_script (hb_face_t *face,
350 : hb_tag_t table_tag,
351 : const hb_tag_t *script_tags,
352 : unsigned int *script_index,
353 : hb_tag_t *chosen_script)
354 : {
355 : ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_SCRIPT_INDEX);
356 4 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
357 :
358 4 : while (*script_tags)
359 : {
360 4 : if (g.find_script_index (*script_tags, script_index)) {
361 4 : if (chosen_script)
362 4 : *chosen_script = *script_tags;
363 4 : return true;
364 : }
365 0 : script_tags++;
366 : }
367 :
368 : /* try finding 'DFLT' */
369 0 : if (g.find_script_index (HB_OT_TAG_DEFAULT_SCRIPT, script_index)) {
370 0 : if (chosen_script)
371 0 : *chosen_script = HB_OT_TAG_DEFAULT_SCRIPT;
372 0 : return false;
373 : }
374 :
375 : /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
376 0 : if (g.find_script_index (HB_OT_TAG_DEFAULT_LANGUAGE, script_index)) {
377 0 : if (chosen_script)
378 0 : *chosen_script = HB_OT_TAG_DEFAULT_LANGUAGE;
379 0 : return false;
380 : }
381 :
382 : /* try with 'latn'; some old fonts put their features there even though
383 : they're really trying to support Thai, for example :( */
384 0 : if (g.find_script_index (HB_OT_TAG_LATIN_SCRIPT, script_index)) {
385 0 : if (chosen_script)
386 0 : *chosen_script = HB_OT_TAG_LATIN_SCRIPT;
387 0 : return false;
388 : }
389 :
390 0 : if (script_index) *script_index = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
391 0 : if (chosen_script)
392 0 : *chosen_script = HB_OT_LAYOUT_NO_SCRIPT_INDEX;
393 0 : return false;
394 : }
395 :
396 : unsigned int
397 0 : hb_ot_layout_table_get_feature_tags (hb_face_t *face,
398 : hb_tag_t table_tag,
399 : unsigned int start_offset,
400 : unsigned int *feature_count /* IN/OUT */,
401 : hb_tag_t *feature_tags /* OUT */)
402 : {
403 0 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
404 :
405 0 : return g.get_feature_tags (start_offset, feature_count, feature_tags);
406 : }
407 :
408 : hb_bool_t
409 0 : hb_ot_layout_table_find_feature (hb_face_t *face,
410 : hb_tag_t table_tag,
411 : hb_tag_t feature_tag,
412 : unsigned int *feature_index)
413 : {
414 : ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
415 0 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
416 :
417 0 : unsigned int num_features = g.get_feature_count ();
418 0 : for (unsigned int i = 0; i < num_features; i++)
419 : {
420 0 : if (feature_tag == g.get_feature_tag (i)) {
421 0 : if (feature_index) *feature_index = i;
422 0 : return true;
423 : }
424 : }
425 :
426 0 : if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
427 0 : return false;
428 : }
429 :
430 :
431 : unsigned int
432 16 : hb_ot_layout_script_get_language_tags (hb_face_t *face,
433 : hb_tag_t table_tag,
434 : unsigned int script_index,
435 : unsigned int start_offset,
436 : unsigned int *language_count /* IN/OUT */,
437 : hb_tag_t *language_tags /* OUT */)
438 : {
439 16 : const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
440 :
441 16 : return s.get_lang_sys_tags (start_offset, language_count, language_tags);
442 : }
443 :
444 : hb_bool_t
445 4 : hb_ot_layout_script_find_language (hb_face_t *face,
446 : hb_tag_t table_tag,
447 : unsigned int script_index,
448 : hb_tag_t language_tag,
449 : unsigned int *language_index)
450 : {
451 : ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX);
452 4 : const OT::Script &s = get_gsubgpos_table (face, table_tag).get_script (script_index);
453 :
454 4 : if (s.find_lang_sys_index (language_tag, language_index))
455 0 : return true;
456 :
457 : /* try with 'dflt'; MS site has had typos and many fonts use it now :( */
458 4 : if (s.find_lang_sys_index (HB_OT_TAG_DEFAULT_LANGUAGE, language_index))
459 0 : return false;
460 :
461 4 : if (language_index) *language_index = HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX;
462 4 : return false;
463 : }
464 :
465 : hb_bool_t
466 61 : hb_ot_layout_language_get_required_feature_index (hb_face_t *face,
467 : hb_tag_t table_tag,
468 : unsigned int script_index,
469 : unsigned int language_index,
470 : unsigned int *feature_index)
471 : {
472 : return hb_ot_layout_language_get_required_feature (face,
473 : table_tag,
474 : script_index,
475 : language_index,
476 : feature_index,
477 61 : NULL);
478 : }
479 :
480 : /**
481 : * hb_ot_layout_language_get_required_feature:
482 : *
483 : * Since: 0.9.30
484 : **/
485 : hb_bool_t
486 65 : hb_ot_layout_language_get_required_feature (hb_face_t *face,
487 : hb_tag_t table_tag,
488 : unsigned int script_index,
489 : unsigned int language_index,
490 : unsigned int *feature_index,
491 : hb_tag_t *feature_tag)
492 : {
493 65 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
494 65 : const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
495 :
496 65 : unsigned int index = l.get_required_feature_index ();
497 65 : if (feature_index) *feature_index = index;
498 65 : if (feature_tag) *feature_tag = g.get_feature_tag (index);
499 :
500 65 : return l.has_required_feature ();
501 : }
502 :
503 : unsigned int
504 61 : hb_ot_layout_language_get_feature_indexes (hb_face_t *face,
505 : hb_tag_t table_tag,
506 : unsigned int script_index,
507 : unsigned int language_index,
508 : unsigned int start_offset,
509 : unsigned int *feature_count /* IN/OUT */,
510 : unsigned int *feature_indexes /* OUT */)
511 : {
512 61 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
513 61 : const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
514 :
515 61 : return l.get_feature_indexes (start_offset, feature_count, feature_indexes);
516 : }
517 :
518 : unsigned int
519 301 : hb_ot_layout_language_get_feature_tags (hb_face_t *face,
520 : hb_tag_t table_tag,
521 : unsigned int script_index,
522 : unsigned int language_index,
523 : unsigned int start_offset,
524 : unsigned int *feature_count /* IN/OUT */,
525 : hb_tag_t *feature_tags /* OUT */)
526 : {
527 301 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
528 301 : const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
529 :
530 : ASSERT_STATIC (sizeof (unsigned int) == sizeof (hb_tag_t));
531 301 : unsigned int ret = l.get_feature_indexes (start_offset, feature_count, (unsigned int *) feature_tags);
532 :
533 301 : if (feature_tags) {
534 301 : unsigned int count = *feature_count;
535 602 : for (unsigned int i = 0; i < count; i++)
536 301 : feature_tags[i] = g.get_feature_tag ((unsigned int) feature_tags[i]);
537 : }
538 :
539 301 : return ret;
540 : }
541 :
542 :
543 : hb_bool_t
544 68 : hb_ot_layout_language_find_feature (hb_face_t *face,
545 : hb_tag_t table_tag,
546 : unsigned int script_index,
547 : unsigned int language_index,
548 : hb_tag_t feature_tag,
549 : unsigned int *feature_index)
550 : {
551 : ASSERT_STATIC (OT::Index::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_FEATURE_INDEX);
552 68 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
553 68 : const OT::LangSys &l = g.get_script (script_index).get_lang_sys (language_index);
554 :
555 68 : unsigned int num_features = l.get_feature_count ();
556 404 : for (unsigned int i = 0; i < num_features; i++) {
557 346 : unsigned int f_index = l.get_feature_index (i);
558 :
559 346 : if (feature_tag == g.get_feature_tag (f_index)) {
560 10 : if (feature_index) *feature_index = f_index;
561 10 : return true;
562 : }
563 : }
564 :
565 58 : if (feature_index) *feature_index = HB_OT_LAYOUT_NO_FEATURE_INDEX;
566 58 : return false;
567 : }
568 :
569 : /**
570 : * hb_ot_layout_feature_get_lookups:
571 : *
572 : * Since: 0.9.7
573 : **/
574 : unsigned int
575 301 : hb_ot_layout_feature_get_lookups (hb_face_t *face,
576 : hb_tag_t table_tag,
577 : unsigned int feature_index,
578 : unsigned int start_offset,
579 : unsigned int *lookup_count /* IN/OUT */,
580 : unsigned int *lookup_indexes /* OUT */)
581 : {
582 : return hb_ot_layout_feature_with_variations_get_lookups (face,
583 : table_tag,
584 : feature_index,
585 : HB_OT_LAYOUT_NO_VARIATIONS_INDEX,
586 : start_offset,
587 : lookup_count,
588 301 : lookup_indexes);
589 : }
590 :
591 : /**
592 : * hb_ot_layout_table_get_lookup_count:
593 : *
594 : * Since: 0.9.22
595 : **/
596 : unsigned int
597 20 : hb_ot_layout_table_get_lookup_count (hb_face_t *face,
598 : hb_tag_t table_tag)
599 : {
600 20 : switch (table_tag)
601 : {
602 : case HB_OT_TAG_GSUB:
603 : {
604 10 : return hb_ot_layout_from_face (face)->gsub_lookup_count;
605 : }
606 : case HB_OT_TAG_GPOS:
607 : {
608 10 : return hb_ot_layout_from_face (face)->gpos_lookup_count;
609 : }
610 : }
611 0 : return 0;
612 : }
613 :
614 : static void
615 0 : _hb_ot_layout_collect_lookups_lookups (hb_face_t *face,
616 : hb_tag_t table_tag,
617 : unsigned int feature_index,
618 : hb_set_t *lookup_indexes /* OUT */)
619 : {
620 : unsigned int lookup_indices[32];
621 : unsigned int offset, len;
622 :
623 0 : offset = 0;
624 0 : do {
625 0 : len = ARRAY_LENGTH (lookup_indices);
626 : hb_ot_layout_feature_get_lookups (face,
627 : table_tag,
628 : feature_index,
629 : offset, &len,
630 0 : lookup_indices);
631 :
632 0 : for (unsigned int i = 0; i < len; i++)
633 0 : lookup_indexes->add (lookup_indices[i]);
634 :
635 0 : offset += len;
636 0 : } while (len == ARRAY_LENGTH (lookup_indices));
637 0 : }
638 :
639 : static void
640 0 : _hb_ot_layout_collect_lookups_features (hb_face_t *face,
641 : hb_tag_t table_tag,
642 : unsigned int script_index,
643 : unsigned int language_index,
644 : const hb_tag_t *features,
645 : hb_set_t *lookup_indexes /* OUT */)
646 : {
647 0 : if (!features)
648 : {
649 : unsigned int required_feature_index;
650 0 : if (hb_ot_layout_language_get_required_feature (face,
651 : table_tag,
652 : script_index,
653 : language_index,
654 : &required_feature_index,
655 : NULL))
656 : _hb_ot_layout_collect_lookups_lookups (face,
657 : table_tag,
658 : required_feature_index,
659 0 : lookup_indexes);
660 :
661 : /* All features */
662 : unsigned int feature_indices[32];
663 : unsigned int offset, len;
664 :
665 0 : offset = 0;
666 0 : do {
667 0 : len = ARRAY_LENGTH (feature_indices);
668 : hb_ot_layout_language_get_feature_indexes (face,
669 : table_tag,
670 : script_index,
671 : language_index,
672 : offset, &len,
673 0 : feature_indices);
674 :
675 0 : for (unsigned int i = 0; i < len; i++)
676 0 : _hb_ot_layout_collect_lookups_lookups (face,
677 : table_tag,
678 : feature_indices[i],
679 0 : lookup_indexes);
680 :
681 0 : offset += len;
682 0 : } while (len == ARRAY_LENGTH (feature_indices));
683 : }
684 : else
685 : {
686 0 : for (; *features; features++)
687 : {
688 : unsigned int feature_index;
689 0 : if (hb_ot_layout_language_find_feature (face,
690 : table_tag,
691 : script_index,
692 : language_index,
693 : *features,
694 : &feature_index))
695 : _hb_ot_layout_collect_lookups_lookups (face,
696 : table_tag,
697 : feature_index,
698 0 : lookup_indexes);
699 : }
700 : }
701 0 : }
702 :
703 : static void
704 0 : _hb_ot_layout_collect_lookups_languages (hb_face_t *face,
705 : hb_tag_t table_tag,
706 : unsigned int script_index,
707 : const hb_tag_t *languages,
708 : const hb_tag_t *features,
709 : hb_set_t *lookup_indexes /* OUT */)
710 : {
711 : _hb_ot_layout_collect_lookups_features (face,
712 : table_tag,
713 : script_index,
714 : HB_OT_LAYOUT_DEFAULT_LANGUAGE_INDEX,
715 : features,
716 0 : lookup_indexes);
717 :
718 0 : if (!languages)
719 : {
720 : /* All languages */
721 : unsigned int count = hb_ot_layout_script_get_language_tags (face,
722 : table_tag,
723 : script_index,
724 0 : 0, NULL, NULL);
725 0 : for (unsigned int language_index = 0; language_index < count; language_index++)
726 : _hb_ot_layout_collect_lookups_features (face,
727 : table_tag,
728 : script_index,
729 : language_index,
730 : features,
731 0 : lookup_indexes);
732 : }
733 : else
734 : {
735 0 : for (; *languages; languages++)
736 : {
737 : unsigned int language_index;
738 0 : if (hb_ot_layout_script_find_language (face,
739 : table_tag,
740 : script_index,
741 : *languages,
742 : &language_index))
743 : _hb_ot_layout_collect_lookups_features (face,
744 : table_tag,
745 : script_index,
746 : language_index,
747 : features,
748 0 : lookup_indexes);
749 : }
750 : }
751 0 : }
752 :
753 : /**
754 : * hb_ot_layout_collect_lookups:
755 : *
756 : * Since: 0.9.8
757 : **/
758 : void
759 0 : hb_ot_layout_collect_lookups (hb_face_t *face,
760 : hb_tag_t table_tag,
761 : const hb_tag_t *scripts,
762 : const hb_tag_t *languages,
763 : const hb_tag_t *features,
764 : hb_set_t *lookup_indexes /* OUT */)
765 : {
766 0 : if (!scripts)
767 : {
768 : /* All scripts */
769 : unsigned int count = hb_ot_layout_table_get_script_tags (face,
770 : table_tag,
771 0 : 0, NULL, NULL);
772 0 : for (unsigned int script_index = 0; script_index < count; script_index++)
773 : _hb_ot_layout_collect_lookups_languages (face,
774 : table_tag,
775 : script_index,
776 : languages,
777 : features,
778 0 : lookup_indexes);
779 : }
780 : else
781 : {
782 0 : for (; *scripts; scripts++)
783 : {
784 : unsigned int script_index;
785 0 : if (hb_ot_layout_table_find_script (face,
786 : table_tag,
787 : *scripts,
788 : &script_index))
789 : _hb_ot_layout_collect_lookups_languages (face,
790 : table_tag,
791 : script_index,
792 : languages,
793 : features,
794 0 : lookup_indexes);
795 : }
796 : }
797 0 : }
798 :
799 : /**
800 : * hb_ot_layout_lookup_collect_glyphs:
801 : *
802 : * Since: 0.9.7
803 : **/
804 : void
805 96 : hb_ot_layout_lookup_collect_glyphs (hb_face_t *face,
806 : hb_tag_t table_tag,
807 : unsigned int lookup_index,
808 : hb_set_t *glyphs_before, /* OUT. May be NULL */
809 : hb_set_t *glyphs_input, /* OUT. May be NULL */
810 : hb_set_t *glyphs_after, /* OUT. May be NULL */
811 : hb_set_t *glyphs_output /* OUT. May be NULL */)
812 : {
813 192 : if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
814 :
815 : OT::hb_collect_glyphs_context_t c (face,
816 : glyphs_before,
817 : glyphs_input,
818 : glyphs_after,
819 96 : glyphs_output);
820 :
821 96 : switch (table_tag)
822 : {
823 : case HB_OT_TAG_GSUB:
824 : {
825 84 : const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
826 84 : l.collect_glyphs (&c);
827 84 : return;
828 : }
829 : case HB_OT_TAG_GPOS:
830 : {
831 12 : const OT::PosLookup& l = hb_ot_layout_from_face (face)->gpos->get_lookup (lookup_index);
832 12 : l.collect_glyphs (&c);
833 12 : return;
834 : }
835 : }
836 : }
837 :
838 :
839 : /* Variations support */
840 :
841 : hb_bool_t
842 4 : hb_ot_layout_table_find_feature_variations (hb_face_t *face,
843 : hb_tag_t table_tag,
844 : const int *coords,
845 : unsigned int num_coords,
846 : unsigned int *variations_index /* out */)
847 : {
848 4 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
849 :
850 4 : return g.find_variations_index (coords, num_coords, variations_index);
851 : }
852 :
853 : unsigned int
854 321 : hb_ot_layout_feature_with_variations_get_lookups (hb_face_t *face,
855 : hb_tag_t table_tag,
856 : unsigned int feature_index,
857 : unsigned int variations_index,
858 : unsigned int start_offset,
859 : unsigned int *lookup_count /* IN/OUT */,
860 : unsigned int *lookup_indexes /* OUT */)
861 : {
862 : ASSERT_STATIC (OT::FeatureVariations::NOT_FOUND_INDEX == HB_OT_LAYOUT_NO_VARIATIONS_INDEX);
863 321 : const OT::GSUBGPOS &g = get_gsubgpos_table (face, table_tag);
864 :
865 321 : const OT::Feature &f = g.get_feature_variation (feature_index, variations_index);
866 :
867 321 : return f.get_lookup_indexes (start_offset, lookup_count, lookup_indexes);
868 : }
869 :
870 :
871 : /*
872 : * OT::GSUB
873 : */
874 :
875 : hb_bool_t
876 2 : hb_ot_layout_has_substitution (hb_face_t *face)
877 : {
878 2 : return &_get_gsub (face) != &OT::Null(OT::GSUB);
879 : }
880 :
881 : /**
882 : * hb_ot_layout_lookup_would_substitute:
883 : *
884 : * Since: 0.9.7
885 : **/
886 : hb_bool_t
887 0 : hb_ot_layout_lookup_would_substitute (hb_face_t *face,
888 : unsigned int lookup_index,
889 : const hb_codepoint_t *glyphs,
890 : unsigned int glyphs_length,
891 : hb_bool_t zero_context)
892 : {
893 0 : if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return false;
894 0 : return hb_ot_layout_lookup_would_substitute_fast (face, lookup_index, glyphs, glyphs_length, zero_context);
895 : }
896 :
897 : hb_bool_t
898 0 : hb_ot_layout_lookup_would_substitute_fast (hb_face_t *face,
899 : unsigned int lookup_index,
900 : const hb_codepoint_t *glyphs,
901 : unsigned int glyphs_length,
902 : hb_bool_t zero_context)
903 : {
904 0 : if (unlikely (lookup_index >= hb_ot_layout_from_face (face)->gsub_lookup_count)) return false;
905 0 : OT::hb_would_apply_context_t c (face, glyphs, glyphs_length, (bool) zero_context);
906 :
907 0 : const OT::SubstLookup& l = hb_ot_layout_from_face (face)->gsub->get_lookup (lookup_index);
908 :
909 0 : return l.would_apply (&c, &hb_ot_layout_from_face (face)->gsub_accels[lookup_index]);
910 : }
911 :
912 : void
913 34 : hb_ot_layout_substitute_start (hb_font_t *font, hb_buffer_t *buffer)
914 : {
915 34 : OT::GSUB::substitute_start (font, buffer);
916 34 : }
917 :
918 : /**
919 : * hb_ot_layout_lookup_substitute_closure:
920 : *
921 : * Since: 0.9.7
922 : **/
923 : void
924 0 : hb_ot_layout_lookup_substitute_closure (hb_face_t *face,
925 : unsigned int lookup_index,
926 : hb_set_t *glyphs)
927 : {
928 0 : OT::hb_closure_context_t c (face, glyphs);
929 :
930 0 : const OT::SubstLookup& l = _get_gsub (face).get_lookup (lookup_index);
931 :
932 0 : l.closure (&c);
933 0 : }
934 :
935 : /*
936 : * OT::GPOS
937 : */
938 :
939 : hb_bool_t
940 36 : hb_ot_layout_has_positioning (hb_face_t *face)
941 : {
942 36 : return &_get_gpos (face) != &OT::Null(OT::GPOS);
943 : }
944 :
945 : void
946 34 : hb_ot_layout_position_start (hb_font_t *font, hb_buffer_t *buffer)
947 : {
948 34 : OT::GPOS::position_start (font, buffer);
949 34 : }
950 :
951 : void
952 34 : hb_ot_layout_position_finish_advances (hb_font_t *font, hb_buffer_t *buffer)
953 : {
954 34 : OT::GPOS::position_finish_advances (font, buffer);
955 34 : }
956 :
957 : void
958 34 : hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
959 : {
960 34 : OT::GPOS::position_finish_offsets (font, buffer);
961 34 : }
962 :
963 : /**
964 : * hb_ot_layout_get_size_params:
965 : *
966 : * Since: 0.9.10
967 : **/
968 : hb_bool_t
969 0 : hb_ot_layout_get_size_params (hb_face_t *face,
970 : unsigned int *design_size, /* OUT. May be NULL */
971 : unsigned int *subfamily_id, /* OUT. May be NULL */
972 : unsigned int *subfamily_name_id, /* OUT. May be NULL */
973 : unsigned int *range_start, /* OUT. May be NULL */
974 : unsigned int *range_end /* OUT. May be NULL */)
975 : {
976 0 : const OT::GPOS &gpos = _get_gpos (face);
977 0 : const hb_tag_t tag = HB_TAG ('s','i','z','e');
978 :
979 0 : unsigned int num_features = gpos.get_feature_count ();
980 0 : for (unsigned int i = 0; i < num_features; i++)
981 : {
982 0 : if (tag == gpos.get_feature_tag (i))
983 : {
984 0 : const OT::Feature &f = gpos.get_feature (i);
985 0 : const OT::FeatureParamsSize ¶ms = f.get_feature_params ().get_size_params (tag);
986 :
987 0 : if (params.designSize)
988 : {
989 : #define PARAM(a, A) if (a) *a = params.A
990 0 : PARAM (design_size, designSize);
991 0 : PARAM (subfamily_id, subfamilyID);
992 0 : PARAM (subfamily_name_id, subfamilyNameID);
993 0 : PARAM (range_start, rangeStart);
994 0 : PARAM (range_end, rangeEnd);
995 : #undef PARAM
996 :
997 0 : return true;
998 : }
999 : }
1000 : }
1001 :
1002 : #define PARAM(a, A) if (a) *a = 0
1003 0 : PARAM (design_size, designSize);
1004 0 : PARAM (subfamily_id, subfamilyID);
1005 0 : PARAM (subfamily_name_id, subfamilyNameID);
1006 0 : PARAM (range_start, rangeStart);
1007 0 : PARAM (range_end, rangeEnd);
1008 : #undef PARAM
1009 :
1010 0 : return false;
1011 : }
1012 :
1013 :
1014 : /*
1015 : * Parts of different types are implemented here such that they have direct
1016 : * access to GSUB/GPOS lookups.
1017 : */
1018 :
1019 :
1020 : struct GSUBProxy
1021 : {
1022 : static const unsigned int table_index = 0;
1023 : static const bool inplace = false;
1024 : typedef OT::SubstLookup Lookup;
1025 :
1026 34 : GSUBProxy (hb_face_t *face) :
1027 34 : table (*hb_ot_layout_from_face (face)->gsub),
1028 34 : accels (hb_ot_layout_from_face (face)->gsub_accels) {}
1029 :
1030 : const OT::GSUB &table;
1031 : const hb_ot_layout_lookup_accelerator_t *accels;
1032 : };
1033 :
1034 : struct GPOSProxy
1035 : {
1036 : static const unsigned int table_index = 1;
1037 : static const bool inplace = true;
1038 : typedef OT::PosLookup Lookup;
1039 :
1040 34 : GPOSProxy (hb_face_t *face) :
1041 34 : table (*hb_ot_layout_from_face (face)->gpos),
1042 34 : accels (hb_ot_layout_from_face (face)->gpos_accels) {}
1043 :
1044 : const OT::GPOS &table;
1045 : const hb_ot_layout_lookup_accelerator_t *accels;
1046 : };
1047 :
1048 :
1049 : struct hb_get_subtables_context_t :
1050 : OT::hb_dispatch_context_t<hb_get_subtables_context_t, hb_void_t, HB_DEBUG_APPLY>
1051 : {
1052 : template <typename Type>
1053 971 : static inline bool apply_to (const void *obj, OT::hb_apply_context_t *c)
1054 : {
1055 971 : const Type *typed_obj = (const Type *) obj;
1056 971 : return typed_obj->apply (c);
1057 : }
1058 :
1059 : typedef bool (*hb_apply_func_t) (const void *obj, OT::hb_apply_context_t *c);
1060 :
1061 : struct hb_applicable_t
1062 : {
1063 494 : inline void init (const void *obj_, hb_apply_func_t apply_func_)
1064 : {
1065 494 : obj = obj_;
1066 494 : apply_func = apply_func_;
1067 494 : }
1068 :
1069 971 : inline bool apply (OT::hb_apply_context_t *c) const { return apply_func (obj, c); }
1070 :
1071 : private:
1072 : const void *obj;
1073 : hb_apply_func_t apply_func;
1074 : };
1075 :
1076 : typedef hb_auto_array_t<hb_applicable_t> array_t;
1077 :
1078 : /* Dispatch interface. */
1079 1482 : inline const char *get_name (void) { return "GET_SUBTABLES"; }
1080 : template <typename T>
1081 494 : inline return_t dispatch (const T &obj)
1082 : {
1083 494 : hb_applicable_t *entry = array.push();
1084 494 : if (likely (entry))
1085 494 : entry->init (&obj, apply_to<T>);
1086 494 : return HB_VOID;
1087 : }
1088 494 : static return_t default_return_value (void) { return HB_VOID; }
1089 494 : bool stop_sublookup_iteration (return_t r HB_UNUSED) const { return false; }
1090 :
1091 494 : hb_get_subtables_context_t (array_t &array_) :
1092 : array (array_),
1093 494 : debug_depth (0) {}
1094 :
1095 : array_t &array;
1096 : unsigned int debug_depth;
1097 : };
1098 :
1099 : static inline bool
1100 494 : apply_forward (OT::hb_apply_context_t *c,
1101 : const hb_ot_layout_lookup_accelerator_t &accel,
1102 : const hb_get_subtables_context_t::array_t &subtables)
1103 : {
1104 494 : bool ret = false;
1105 494 : hb_buffer_t *buffer = c->buffer;
1106 8434 : while (buffer->idx < buffer->len && !buffer->in_error)
1107 : {
1108 3970 : bool applied = false;
1109 8955 : if (accel.may_have (buffer->cur().codepoint) &&
1110 4941 : (buffer->cur().mask & c->lookup_mask) &&
1111 971 : c->check_glyph_property (&buffer->cur(), c->lookup_props))
1112 : {
1113 1757 : for (unsigned int i = 0; i < subtables.len; i++)
1114 971 : if (subtables[i].apply (c))
1115 : {
1116 185 : applied = true;
1117 185 : break;
1118 : }
1119 : }
1120 :
1121 3970 : if (applied)
1122 185 : ret = true;
1123 : else
1124 3785 : buffer->next_glyph ();
1125 : }
1126 494 : return ret;
1127 : }
1128 :
1129 : static inline bool
1130 0 : apply_backward (OT::hb_apply_context_t *c,
1131 : const hb_ot_layout_lookup_accelerator_t &accel,
1132 : const hb_get_subtables_context_t::array_t &subtables)
1133 : {
1134 0 : bool ret = false;
1135 0 : hb_buffer_t *buffer = c->buffer;
1136 0 : do
1137 : {
1138 0 : if (accel.may_have (buffer->cur().codepoint) &&
1139 0 : (buffer->cur().mask & c->lookup_mask) &&
1140 0 : c->check_glyph_property (&buffer->cur(), c->lookup_props))
1141 : {
1142 0 : for (unsigned int i = 0; i < subtables.len; i++)
1143 0 : if (subtables[i].apply (c))
1144 : {
1145 0 : ret = true;
1146 0 : break;
1147 : }
1148 : }
1149 : /* The reverse lookup doesn't "advance" cursor (for good reason). */
1150 0 : buffer->idx--;
1151 :
1152 : }
1153 0 : while ((int) buffer->idx >= 0);
1154 0 : return ret;
1155 : }
1156 :
1157 : template <typename Proxy>
1158 : static inline void
1159 494 : apply_string (OT::hb_apply_context_t *c,
1160 : const typename Proxy::Lookup &lookup,
1161 : const hb_ot_layout_lookup_accelerator_t &accel)
1162 : {
1163 494 : hb_buffer_t *buffer = c->buffer;
1164 :
1165 494 : if (unlikely (!buffer->len || !c->lookup_mask))
1166 0 : return;
1167 :
1168 494 : c->set_lookup_props (lookup.get_props ());
1169 :
1170 988 : hb_get_subtables_context_t::array_t subtables;
1171 494 : hb_get_subtables_context_t c_get_subtables (subtables);
1172 494 : lookup.dispatch (&c_get_subtables);
1173 :
1174 494 : if (likely (!lookup.is_reverse ()))
1175 : {
1176 : /* in/out forward substitution/positioning */
1177 : if (Proxy::table_index == 0)
1178 218 : buffer->clear_output ();
1179 494 : buffer->idx = 0;
1180 :
1181 : bool ret;
1182 494 : ret = apply_forward (c, accel, subtables);
1183 494 : if (ret)
1184 : {
1185 : if (!Proxy::inplace)
1186 0 : buffer->swap_buffers ();
1187 : else
1188 36 : assert (!buffer->has_separate_output ());
1189 : }
1190 : }
1191 : else
1192 : {
1193 : /* in-place backward substitution/positioning */
1194 : if (Proxy::table_index == 0)
1195 0 : buffer->remove_output ();
1196 0 : buffer->idx = buffer->len - 1;
1197 :
1198 0 : apply_backward (c, accel, subtables);
1199 : }
1200 : }
1201 :
1202 : template <typename Proxy>
1203 68 : inline void hb_ot_map_t::apply (const Proxy &proxy,
1204 : const hb_ot_shape_plan_t *plan,
1205 : hb_font_t *font,
1206 : hb_buffer_t *buffer) const
1207 : {
1208 68 : const unsigned int table_index = proxy.table_index;
1209 68 : unsigned int i = 0;
1210 68 : OT::hb_apply_context_t c (table_index, font, buffer);
1211 68 : c.set_recurse_func (Proxy::Lookup::apply_recurse_func);
1212 :
1213 170 : for (unsigned int stage_index = 0; stage_index < stages[table_index].len; stage_index++) {
1214 102 : const stage_map_t *stage = &stages[table_index][stage_index];
1215 1090 : for (; i < stage->last_lookup; i++)
1216 : {
1217 494 : unsigned int lookup_index = lookups[table_index][i].index;
1218 494 : if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
1219 494 : c.set_lookup_index (lookup_index);
1220 494 : c.set_lookup_mask (lookups[table_index][i].mask);
1221 494 : c.set_auto_zwj (lookups[table_index][i].auto_zwj);
1222 988 : apply_string<Proxy> (&c,
1223 494 : proxy.table.get_lookup (lookup_index),
1224 494 : proxy.accels[lookup_index]);
1225 494 : (void) buffer->message (font, "end lookup %d", lookup_index);
1226 : }
1227 :
1228 102 : if (stage->pause_func)
1229 : {
1230 0 : buffer->clear_output ();
1231 0 : stage->pause_func (plan, font, buffer);
1232 : }
1233 : }
1234 68 : }
1235 :
1236 34 : void hb_ot_map_t::substitute (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1237 : {
1238 34 : GSUBProxy proxy (font->face);
1239 34 : apply (proxy, plan, font, buffer);
1240 34 : }
1241 :
1242 34 : void hb_ot_map_t::position (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const
1243 : {
1244 34 : GPOSProxy proxy (font->face);
1245 34 : apply (proxy, plan, font, buffer);
1246 34 : }
1247 :
1248 : HB_INTERNAL void
1249 0 : hb_ot_layout_substitute_lookup (OT::hb_apply_context_t *c,
1250 : const OT::SubstLookup &lookup,
1251 : const hb_ot_layout_lookup_accelerator_t &accel)
1252 : {
1253 0 : apply_string<GSUBProxy> (c, lookup, accel);
1254 0 : }
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