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