1 /* 2 * Copyright 2012,2013 Mozilla Foundation. 3 * Copyright 2012,2013 Google, Inc. 4 * 5 * This is part of HarfBuzz, a text shaping library. 6 * 7 * Permission is hereby granted, without written agreement and without 8 * license or royalty fees, to use, copy, modify, and distribute this 9 * software and its documentation for any purpose, provided that the 10 * above copyright notice and the following two paragraphs appear in 11 * all copies of this software. 12 * 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17 * DAMAGE. 18 * 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24 * 25 * Mozilla Author(s): Jonathan Kew 26 * Google Author(s): Behdad Esfahbod 27 */ 28 29 #define HB_SHAPER coretext 30 31 #include "hb-private.hh" 32 #include "hb-debug.hh" 33 #include "hb-shaper-impl-private.hh" 34 35 #include "hb-coretext.h" 36 #include <math.h> 37 38 /* https://developer.apple.com/documentation/coretext/1508745-ctfontcreatewithgraphicsfont */ 39 #define HB_CORETEXT_DEFAULT_FONT_SIZE 12.f 40 41 static CGFloat 42 coretext_font_size_from_ptem (float ptem) 43 { 44 /* CoreText points are CSS pixels (96 per inch), 45 * NOT typographic points (72 per inch). 46 * 47 * https://developer.apple.com/library/content/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html 48 */ 49 ptem *= 96.f / 72.f; 50 return ptem <= 0.f ? HB_CORETEXT_DEFAULT_FONT_SIZE : ptem; 51 } 52 static float 53 coretext_font_size_to_ptem (CGFloat size) 54 { 55 size *= 72.f / 96.f; 56 return size <= 0.f ? 0 : size; 57 } 58 59 static void 60 release_table_data (void *user_data) 61 { 62 CFDataRef cf_data = reinterpret_cast<CFDataRef> (user_data); 63 CFRelease(cf_data); 64 } 65 66 static hb_blob_t * 67 reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data) 68 { 69 CGFontRef cg_font = reinterpret_cast<CGFontRef> (user_data); 70 CFDataRef cf_data = CGFontCopyTableForTag (cg_font, tag); 71 if (unlikely (!cf_data)) 72 return nullptr; 73 74 const char *data = reinterpret_cast<const char*> (CFDataGetBytePtr (cf_data)); 75 const size_t length = CFDataGetLength (cf_data); 76 if (!data || !length) 77 return nullptr; 78 79 return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY, 80 reinterpret_cast<void *> (const_cast<__CFData *> (cf_data)), 81 release_table_data); 82 } 83 84 static void 85 _hb_cg_font_release (void *data) 86 { 87 CGFontRelease ((CGFontRef) data); 88 } 89 90 91 HB_SHAPER_DATA_ENSURE_DEFINE(coretext, face) 92 HB_SHAPER_DATA_ENSURE_DEFINE_WITH_CONDITION(coretext, font, 93 fabs (CTFontGetSize((CTFontRef) data) - coretext_font_size_from_ptem (font->ptem)) <= .5 94 ) 95 96 static CTFontDescriptorRef 97 get_last_resort_font_desc (void) 98 { 99 // TODO Handle allocation failures? 100 CTFontDescriptorRef last_resort = CTFontDescriptorCreateWithNameAndSize (CFSTR("LastResort"), 0); 101 CFArrayRef cascade_list = CFArrayCreate (kCFAllocatorDefault, 102 (const void **) &last_resort, 103 1, 104 &kCFTypeArrayCallBacks); 105 CFRelease (last_resort); 106 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault, 107 (const void **) &kCTFontCascadeListAttribute, 108 (const void **) &cascade_list, 109 1, 110 &kCFTypeDictionaryKeyCallBacks, 111 &kCFTypeDictionaryValueCallBacks); 112 CFRelease (cascade_list); 113 114 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes); 115 CFRelease (attributes); 116 return font_desc; 117 } 118 119 static void 120 release_data (void *info, const void *data, size_t size) 121 { 122 assert (hb_blob_get_length ((hb_blob_t *) info) == size && 123 hb_blob_get_data ((hb_blob_t *) info, nullptr) == data); 124 125 hb_blob_destroy ((hb_blob_t *) info); 126 } 127 128 static CGFontRef 129 create_cg_font (hb_face_t *face) 130 { 131 CGFontRef cg_font = nullptr; 132 if (face->destroy == _hb_cg_font_release) 133 { 134 cg_font = CGFontRetain ((CGFontRef) face->user_data); 135 } 136 else 137 { 138 hb_blob_t *blob = hb_face_reference_blob (face); 139 unsigned int blob_length; 140 const char *blob_data = hb_blob_get_data (blob, &blob_length); 141 if (unlikely (!blob_length)) 142 DEBUG_MSG (CORETEXT, face, "Face has empty blob"); 143 144 CGDataProviderRef provider = CGDataProviderCreateWithData (blob, blob_data, blob_length, &release_data); 145 if (likely (provider)) 146 { 147 cg_font = CGFontCreateWithDataProvider (provider); 148 if (unlikely (!cg_font)) 149 DEBUG_MSG (CORETEXT, face, "Face CGFontCreateWithDataProvider() failed"); 150 CGDataProviderRelease (provider); 151 } 152 } 153 return cg_font; 154 } 155 156 static CTFontRef 157 create_ct_font (CGFontRef cg_font, CGFloat font_size) 158 { 159 CTFontRef ct_font = nullptr; 160 161 /* CoreText does not enable trak table usage / tracking when creating a CTFont 162 * using CTFontCreateWithGraphicsFont. The only way of enabling tracking seems 163 * to be through the CTFontCreateUIFontForLanguage call. */ 164 CFStringRef cg_postscript_name = CGFontCopyPostScriptName (cg_font); 165 if (CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSText")) || 166 CFStringHasPrefix (cg_postscript_name, CFSTR (".SFNSDisplay"))) 167 { 168 CTFontUIFontType font_type = kCTFontUIFontSystem; 169 if (CFStringHasSuffix (cg_postscript_name, CFSTR ("-Bold"))) 170 font_type = kCTFontUIFontEmphasizedSystem; 171 172 ct_font = CTFontCreateUIFontForLanguage (font_type, font_size, nullptr); 173 CFStringRef ct_result_name = CTFontCopyPostScriptName(ct_font); 174 if (CFStringCompare (ct_result_name, cg_postscript_name, 0) != kCFCompareEqualTo) 175 { 176 CFRelease(ct_font); 177 ct_font = nullptr; 178 } 179 CFRelease (ct_result_name); 180 } 181 CFRelease (cg_postscript_name); 182 183 if (!ct_font) 184 ct_font = CTFontCreateWithGraphicsFont (cg_font, font_size, nullptr, nullptr); 185 186 if (unlikely (!ct_font)) { 187 DEBUG_MSG (CORETEXT, cg_font, "Font CTFontCreateWithGraphicsFont() failed"); 188 return nullptr; 189 } 190 191 /* crbug.com/576941 and crbug.com/625902 and the investigation in the latter 192 * bug indicate that the cascade list reconfiguration occasionally causes 193 * crashes in CoreText on OS X 10.9, thus let's skip this step on older 194 * operating system versions. Except for the emoji font, where _not_ 195 * reconfiguring the cascade list causes CoreText crashes. For details, see 196 * crbug.com/549610 */ 197 // 0x00070000 stands for "kCTVersionNumber10_10", see CoreText.h 198 if (&CTGetCoreTextVersion != nullptr && CTGetCoreTextVersion() < 0x00070000) { 199 CFStringRef fontName = CTFontCopyPostScriptName (ct_font); 200 bool isEmojiFont = CFStringCompare (fontName, CFSTR("AppleColorEmoji"), 0) == kCFCompareEqualTo; 201 CFRelease (fontName); 202 if (!isEmojiFont) 203 return ct_font; 204 } 205 206 CFURLRef original_url = (CFURLRef)CTFontCopyAttribute(ct_font, kCTFontURLAttribute); 207 208 /* Create font copy with cascade list that has LastResort first; this speeds up CoreText 209 * font fallback which we don't need anyway. */ 210 { 211 CTFontDescriptorRef last_resort_font_desc = get_last_resort_font_desc (); 212 CTFontRef new_ct_font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, last_resort_font_desc); 213 CFRelease (last_resort_font_desc); 214 if (new_ct_font) 215 { 216 /* The CTFontCreateCopyWithAttributes call fails to stay on the same font 217 * when reconfiguring the cascade list and may switch to a different font 218 * when there are fonts that go by the same name, since the descriptor is 219 * just name and size. 220 * 221 * Avoid reconfiguring the cascade lists if the new font is outside the 222 * system locations that we cannot access from the sandboxed renderer 223 * process in Blink. This can be detected by the new file URL location 224 * that the newly found font points to. */ 225 CFURLRef new_url = (CFURLRef) CTFontCopyAttribute (new_ct_font, kCTFontURLAttribute); 226 // Keep reconfigured font if URL cannot be retrieved (seems to be the case 227 // on Mac OS 10.12 Sierra), speculative fix for crbug.com/625606 228 if (!original_url || !new_url || CFEqual (original_url, new_url)) { 229 CFRelease (ct_font); 230 ct_font = new_ct_font; 231 } else { 232 CFRelease (new_ct_font); 233 DEBUG_MSG (CORETEXT, ct_font, "Discarding reconfigured CTFont, location changed."); 234 } 235 if (new_url) 236 CFRelease (new_url); 237 } 238 else 239 DEBUG_MSG (CORETEXT, ct_font, "Font copy with empty cascade list failed"); 240 } 241 242 if (original_url) 243 CFRelease (original_url); 244 return ct_font; 245 } 246 247 hb_coretext_shaper_face_data_t * 248 _hb_coretext_shaper_face_data_create (hb_face_t *face) 249 { 250 CGFontRef cg_font = create_cg_font (face); 251 252 if (unlikely (!cg_font)) 253 { 254 DEBUG_MSG (CORETEXT, face, "CGFont creation failed.."); 255 return nullptr; 256 } 257 258 return (hb_coretext_shaper_face_data_t *) cg_font; 259 } 260 261 void 262 _hb_coretext_shaper_face_data_destroy (hb_coretext_shaper_face_data_t *data) 263 { 264 CFRelease ((CGFontRef) data); 265 } 266 267 hb_face_t * 268 hb_coretext_face_create (CGFontRef cg_font) 269 { 270 return hb_face_create_for_tables (reference_table, CGFontRetain (cg_font), _hb_cg_font_release); 271 } 272 273 /* 274 * Since: 0.9.10 275 */ 276 CGFontRef 277 hb_coretext_face_get_cg_font (hb_face_t *face) 278 { 279 if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return nullptr; 280 return (CGFontRef) HB_SHAPER_DATA_GET (face); 281 } 282 283 284 hb_coretext_shaper_font_data_t * 285 _hb_coretext_shaper_font_data_create (hb_font_t *font) 286 { 287 hb_face_t *face = font->face; 288 if (unlikely (!hb_coretext_shaper_face_data_ensure (face))) return nullptr; 289 CGFontRef cg_font = (CGFontRef) HB_SHAPER_DATA_GET (face); 290 291 CTFontRef ct_font = create_ct_font (cg_font, coretext_font_size_from_ptem (font->ptem)); 292 293 if (unlikely (!ct_font)) 294 { 295 DEBUG_MSG (CORETEXT, font, "CGFont creation failed.."); 296 return nullptr; 297 } 298 299 return (hb_coretext_shaper_font_data_t *) ct_font; 300 } 301 302 void 303 _hb_coretext_shaper_font_data_destroy (hb_coretext_shaper_font_data_t *data) 304 { 305 CFRelease ((CTFontRef) data); 306 } 307 308 /* 309 * Since: 1.7.2 310 */ 311 hb_font_t * 312 hb_coretext_font_create (CTFontRef ct_font) 313 { 314 CGFontRef cg_font = CTFontCopyGraphicsFont (ct_font, 0); 315 hb_face_t *face = hb_coretext_face_create (cg_font); 316 CFRelease (cg_font); 317 hb_font_t *font = hb_font_create (face); 318 hb_face_destroy (face); 319 320 if (unlikely (hb_object_is_inert (font))) 321 return font; 322 323 hb_font_set_ptem (font, coretext_font_size_to_ptem (CTFontGetSize(ct_font))); 324 325 /* Let there be dragons here... */ 326 HB_SHAPER_DATA_GET (font) = (hb_coretext_shaper_font_data_t *) CFRetain (ct_font); 327 328 return font; 329 } 330 331 CTFontRef 332 hb_coretext_font_get_ct_font (hb_font_t *font) 333 { 334 if (unlikely (!hb_coretext_shaper_font_data_ensure (font))) return nullptr; 335 return (CTFontRef) HB_SHAPER_DATA_GET (font); 336 } 337 338 339 340 /* 341 * shaper shape_plan data 342 */ 343 344 struct hb_coretext_shaper_shape_plan_data_t {}; 345 346 hb_coretext_shaper_shape_plan_data_t * 347 _hb_coretext_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 348 const hb_feature_t *user_features HB_UNUSED, 349 unsigned int num_user_features HB_UNUSED, 350 const int *coords HB_UNUSED, 351 unsigned int num_coords HB_UNUSED) 352 { 353 return (hb_coretext_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 354 } 355 356 void 357 _hb_coretext_shaper_shape_plan_data_destroy (hb_coretext_shaper_shape_plan_data_t *data HB_UNUSED) 358 { 359 } 360 361 362 /* 363 * shaper 364 */ 365 366 struct feature_record_t { 367 unsigned int feature; 368 unsigned int setting; 369 }; 370 371 struct active_feature_t { 372 feature_record_t rec; 373 unsigned int order; 374 375 static int cmp (const void *pa, const void *pb) { 376 const active_feature_t *a = (const active_feature_t *) pa; 377 const active_feature_t *b = (const active_feature_t *) pb; 378 return a->rec.feature < b->rec.feature ? -1 : a->rec.feature > b->rec.feature ? 1 : 379 a->order < b->order ? -1 : a->order > b->order ? 1 : 380 a->rec.setting < b->rec.setting ? -1 : a->rec.setting > b->rec.setting ? 1 : 381 0; 382 } 383 bool operator== (const active_feature_t *f) { 384 return cmp (this, f) == 0; 385 } 386 }; 387 388 struct feature_event_t { 389 unsigned int index; 390 bool start; 391 active_feature_t feature; 392 393 static int cmp (const void *pa, const void *pb) { 394 const feature_event_t *a = (const feature_event_t *) pa; 395 const feature_event_t *b = (const feature_event_t *) pb; 396 return a->index < b->index ? -1 : a->index > b->index ? 1 : 397 a->start < b->start ? -1 : a->start > b->start ? 1 : 398 active_feature_t::cmp (&a->feature, &b->feature); 399 } 400 }; 401 402 struct range_record_t { 403 CTFontRef font; 404 unsigned int index_first; /* == start */ 405 unsigned int index_last; /* == end - 1 */ 406 }; 407 408 409 /* The following enum members are added in OS X 10.8. */ 410 #define kAltHalfWidthTextSelector 6 411 #define kAltProportionalTextSelector 5 412 #define kAlternateHorizKanaOffSelector 1 413 #define kAlternateHorizKanaOnSelector 0 414 #define kAlternateKanaType 34 415 #define kAlternateVertKanaOffSelector 3 416 #define kAlternateVertKanaOnSelector 2 417 #define kCaseSensitiveLayoutOffSelector 1 418 #define kCaseSensitiveLayoutOnSelector 0 419 #define kCaseSensitiveLayoutType 33 420 #define kCaseSensitiveSpacingOffSelector 3 421 #define kCaseSensitiveSpacingOnSelector 2 422 #define kContextualAlternatesOffSelector 1 423 #define kContextualAlternatesOnSelector 0 424 #define kContextualAlternatesType 36 425 #define kContextualLigaturesOffSelector 19 426 #define kContextualLigaturesOnSelector 18 427 #define kContextualSwashAlternatesOffSelector 5 428 #define kContextualSwashAlternatesOnSelector 4 429 #define kDefaultLowerCaseSelector 0 430 #define kDefaultUpperCaseSelector 0 431 #define kHistoricalLigaturesOffSelector 21 432 #define kHistoricalLigaturesOnSelector 20 433 #define kHojoCharactersSelector 12 434 #define kJIS2004CharactersSelector 11 435 #define kLowerCasePetiteCapsSelector 2 436 #define kLowerCaseSmallCapsSelector 1 437 #define kLowerCaseType 37 438 #define kMathematicalGreekOffSelector 11 439 #define kMathematicalGreekOnSelector 10 440 #define kNLCCharactersSelector 13 441 #define kQuarterWidthTextSelector 4 442 #define kScientificInferiorsSelector 4 443 #define kStylisticAltEightOffSelector 17 444 #define kStylisticAltEightOnSelector 16 445 #define kStylisticAltEighteenOffSelector 37 446 #define kStylisticAltEighteenOnSelector 36 447 #define kStylisticAltElevenOffSelector 23 448 #define kStylisticAltElevenOnSelector 22 449 #define kStylisticAltFifteenOffSelector 31 450 #define kStylisticAltFifteenOnSelector 30 451 #define kStylisticAltFiveOffSelector 11 452 #define kStylisticAltFiveOnSelector 10 453 #define kStylisticAltFourOffSelector 9 454 #define kStylisticAltFourOnSelector 8 455 #define kStylisticAltFourteenOffSelector 29 456 #define kStylisticAltFourteenOnSelector 28 457 #define kStylisticAltNineOffSelector 19 458 #define kStylisticAltNineOnSelector 18 459 #define kStylisticAltNineteenOffSelector 39 460 #define kStylisticAltNineteenOnSelector 38 461 #define kStylisticAltOneOffSelector 3 462 #define kStylisticAltOneOnSelector 2 463 #define kStylisticAltSevenOffSelector 15 464 #define kStylisticAltSevenOnSelector 14 465 #define kStylisticAltSeventeenOffSelector 35 466 #define kStylisticAltSeventeenOnSelector 34 467 #define kStylisticAltSixOffSelector 13 468 #define kStylisticAltSixOnSelector 12 469 #define kStylisticAltSixteenOffSelector 33 470 #define kStylisticAltSixteenOnSelector 32 471 #define kStylisticAltTenOffSelector 21 472 #define kStylisticAltTenOnSelector 20 473 #define kStylisticAltThirteenOffSelector 27 474 #define kStylisticAltThirteenOnSelector 26 475 #define kStylisticAltThreeOffSelector 7 476 #define kStylisticAltThreeOnSelector 6 477 #define kStylisticAltTwelveOffSelector 25 478 #define kStylisticAltTwelveOnSelector 24 479 #define kStylisticAltTwentyOffSelector 41 480 #define kStylisticAltTwentyOnSelector 40 481 #define kStylisticAltTwoOffSelector 5 482 #define kStylisticAltTwoOnSelector 4 483 #define kStylisticAlternativesType 35 484 #define kSwashAlternatesOffSelector 3 485 #define kSwashAlternatesOnSelector 2 486 #define kThirdWidthTextSelector 3 487 #define kTraditionalNamesCharactersSelector 14 488 #define kUpperCasePetiteCapsSelector 2 489 #define kUpperCaseSmallCapsSelector 1 490 #define kUpperCaseType 38 491 492 /* Table data courtesy of Apple. */ 493 static const struct feature_mapping_t { 494 FourCharCode otFeatureTag; 495 uint16_t aatFeatureType; 496 uint16_t selectorToEnable; 497 uint16_t selectorToDisable; 498 } feature_mappings[] = { 499 { 'c2pc', kUpperCaseType, kUpperCasePetiteCapsSelector, kDefaultUpperCaseSelector }, 500 { 'c2sc', kUpperCaseType, kUpperCaseSmallCapsSelector, kDefaultUpperCaseSelector }, 501 { 'calt', kContextualAlternatesType, kContextualAlternatesOnSelector, kContextualAlternatesOffSelector }, 502 { 'case', kCaseSensitiveLayoutType, kCaseSensitiveLayoutOnSelector, kCaseSensitiveLayoutOffSelector }, 503 { 'clig', kLigaturesType, kContextualLigaturesOnSelector, kContextualLigaturesOffSelector }, 504 { 'cpsp', kCaseSensitiveLayoutType, kCaseSensitiveSpacingOnSelector, kCaseSensitiveSpacingOffSelector }, 505 { 'cswh', kContextualAlternatesType, kContextualSwashAlternatesOnSelector, kContextualSwashAlternatesOffSelector }, 506 { 'dlig', kLigaturesType, kRareLigaturesOnSelector, kRareLigaturesOffSelector }, 507 { 'expt', kCharacterShapeType, kExpertCharactersSelector, 16 }, 508 { 'frac', kFractionsType, kDiagonalFractionsSelector, kNoFractionsSelector }, 509 { 'fwid', kTextSpacingType, kMonospacedTextSelector, 7 }, 510 { 'halt', kTextSpacingType, kAltHalfWidthTextSelector, 7 }, 511 { 'hist', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector }, 512 { 'hkna', kAlternateKanaType, kAlternateHorizKanaOnSelector, kAlternateHorizKanaOffSelector, }, 513 { 'hlig', kLigaturesType, kHistoricalLigaturesOnSelector, kHistoricalLigaturesOffSelector }, 514 { 'hngl', kTransliterationType, kHanjaToHangulSelector, kNoTransliterationSelector }, 515 { 'hojo', kCharacterShapeType, kHojoCharactersSelector, 16 }, 516 { 'hwid', kTextSpacingType, kHalfWidthTextSelector, 7 }, 517 { 'ital', kItalicCJKRomanType, kCJKItalicRomanOnSelector, kCJKItalicRomanOffSelector }, 518 { 'jp04', kCharacterShapeType, kJIS2004CharactersSelector, 16 }, 519 { 'jp78', kCharacterShapeType, kJIS1978CharactersSelector, 16 }, 520 { 'jp83', kCharacterShapeType, kJIS1983CharactersSelector, 16 }, 521 { 'jp90', kCharacterShapeType, kJIS1990CharactersSelector, 16 }, 522 { 'liga', kLigaturesType, kCommonLigaturesOnSelector, kCommonLigaturesOffSelector }, 523 { 'lnum', kNumberCaseType, kUpperCaseNumbersSelector, 2 }, 524 { 'mgrk', kMathematicalExtrasType, kMathematicalGreekOnSelector, kMathematicalGreekOffSelector }, 525 { 'nlck', kCharacterShapeType, kNLCCharactersSelector, 16 }, 526 { 'onum', kNumberCaseType, kLowerCaseNumbersSelector, 2 }, 527 { 'ordn', kVerticalPositionType, kOrdinalsSelector, kNormalPositionSelector }, 528 { 'palt', kTextSpacingType, kAltProportionalTextSelector, 7 }, 529 { 'pcap', kLowerCaseType, kLowerCasePetiteCapsSelector, kDefaultLowerCaseSelector }, 530 { 'pkna', kTextSpacingType, kProportionalTextSelector, 7 }, 531 { 'pnum', kNumberSpacingType, kProportionalNumbersSelector, 4 }, 532 { 'pwid', kTextSpacingType, kProportionalTextSelector, 7 }, 533 { 'qwid', kTextSpacingType, kQuarterWidthTextSelector, 7 }, 534 { 'ruby', kRubyKanaType, kRubyKanaOnSelector, kRubyKanaOffSelector }, 535 { 'sinf', kVerticalPositionType, kScientificInferiorsSelector, kNormalPositionSelector }, 536 { 'smcp', kLowerCaseType, kLowerCaseSmallCapsSelector, kDefaultLowerCaseSelector }, 537 { 'smpl', kCharacterShapeType, kSimplifiedCharactersSelector, 16 }, 538 { 'ss01', kStylisticAlternativesType, kStylisticAltOneOnSelector, kStylisticAltOneOffSelector }, 539 { 'ss02', kStylisticAlternativesType, kStylisticAltTwoOnSelector, kStylisticAltTwoOffSelector }, 540 { 'ss03', kStylisticAlternativesType, kStylisticAltThreeOnSelector, kStylisticAltThreeOffSelector }, 541 { 'ss04', kStylisticAlternativesType, kStylisticAltFourOnSelector, kStylisticAltFourOffSelector }, 542 { 'ss05', kStylisticAlternativesType, kStylisticAltFiveOnSelector, kStylisticAltFiveOffSelector }, 543 { 'ss06', kStylisticAlternativesType, kStylisticAltSixOnSelector, kStylisticAltSixOffSelector }, 544 { 'ss07', kStylisticAlternativesType, kStylisticAltSevenOnSelector, kStylisticAltSevenOffSelector }, 545 { 'ss08', kStylisticAlternativesType, kStylisticAltEightOnSelector, kStylisticAltEightOffSelector }, 546 { 'ss09', kStylisticAlternativesType, kStylisticAltNineOnSelector, kStylisticAltNineOffSelector }, 547 { 'ss10', kStylisticAlternativesType, kStylisticAltTenOnSelector, kStylisticAltTenOffSelector }, 548 { 'ss11', kStylisticAlternativesType, kStylisticAltElevenOnSelector, kStylisticAltElevenOffSelector }, 549 { 'ss12', kStylisticAlternativesType, kStylisticAltTwelveOnSelector, kStylisticAltTwelveOffSelector }, 550 { 'ss13', kStylisticAlternativesType, kStylisticAltThirteenOnSelector, kStylisticAltThirteenOffSelector }, 551 { 'ss14', kStylisticAlternativesType, kStylisticAltFourteenOnSelector, kStylisticAltFourteenOffSelector }, 552 { 'ss15', kStylisticAlternativesType, kStylisticAltFifteenOnSelector, kStylisticAltFifteenOffSelector }, 553 { 'ss16', kStylisticAlternativesType, kStylisticAltSixteenOnSelector, kStylisticAltSixteenOffSelector }, 554 { 'ss17', kStylisticAlternativesType, kStylisticAltSeventeenOnSelector, kStylisticAltSeventeenOffSelector }, 555 { 'ss18', kStylisticAlternativesType, kStylisticAltEighteenOnSelector, kStylisticAltEighteenOffSelector }, 556 { 'ss19', kStylisticAlternativesType, kStylisticAltNineteenOnSelector, kStylisticAltNineteenOffSelector }, 557 { 'ss20', kStylisticAlternativesType, kStylisticAltTwentyOnSelector, kStylisticAltTwentyOffSelector }, 558 { 'subs', kVerticalPositionType, kInferiorsSelector, kNormalPositionSelector }, 559 { 'sups', kVerticalPositionType, kSuperiorsSelector, kNormalPositionSelector }, 560 { 'swsh', kContextualAlternatesType, kSwashAlternatesOnSelector, kSwashAlternatesOffSelector }, 561 { 'titl', kStyleOptionsType, kTitlingCapsSelector, kNoStyleOptionsSelector }, 562 { 'tnam', kCharacterShapeType, kTraditionalNamesCharactersSelector, 16 }, 563 { 'tnum', kNumberSpacingType, kMonospacedNumbersSelector, 4 }, 564 { 'trad', kCharacterShapeType, kTraditionalCharactersSelector, 16 }, 565 { 'twid', kTextSpacingType, kThirdWidthTextSelector, 7 }, 566 { 'unic', kLetterCaseType, 14, 15 }, 567 { 'valt', kTextSpacingType, kAltProportionalTextSelector, 7 }, 568 { 'vert', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector }, 569 { 'vhal', kTextSpacingType, kAltHalfWidthTextSelector, 7 }, 570 { 'vkna', kAlternateKanaType, kAlternateVertKanaOnSelector, kAlternateVertKanaOffSelector }, 571 { 'vpal', kTextSpacingType, kAltProportionalTextSelector, 7 }, 572 { 'vrt2', kVerticalSubstitutionType, kSubstituteVerticalFormsOnSelector, kSubstituteVerticalFormsOffSelector }, 573 { 'zero', kTypographicExtrasType, kSlashedZeroOnSelector, kSlashedZeroOffSelector }, 574 }; 575 576 static int 577 _hb_feature_mapping_cmp (const void *key_, const void *entry_) 578 { 579 unsigned int key = * (unsigned int *) key_; 580 const feature_mapping_t * entry = (const feature_mapping_t *) entry_; 581 return key < entry->otFeatureTag ? -1 : 582 key > entry->otFeatureTag ? 1 : 583 0; 584 } 585 586 hb_bool_t 587 _hb_coretext_shape (hb_shape_plan_t *shape_plan, 588 hb_font_t *font, 589 hb_buffer_t *buffer, 590 const hb_feature_t *features, 591 unsigned int num_features) 592 { 593 hb_face_t *face = font->face; 594 CGFontRef cg_font = (CGFontRef) HB_SHAPER_DATA_GET (face); 595 CTFontRef ct_font = (CTFontRef) HB_SHAPER_DATA_GET (font); 596 597 CGFloat ct_font_size = CTFontGetSize (ct_font); 598 CGFloat x_mult = (CGFloat) font->x_scale / ct_font_size; 599 CGFloat y_mult = (CGFloat) font->y_scale / ct_font_size; 600 601 /* Attach marks to their bases, to match the 'ot' shaper. 602 * Adapted from hb-ot-shape:hb_form_clusters(). 603 * Note that this only makes us be closer to the 'ot' shaper, 604 * but by no means the same. For example, if there's 605 * B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will 606 * continue pointing to B2 even though B2 was merged into B1's 607 * cluster... */ 608 if (buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) 609 { 610 hb_unicode_funcs_t *unicode = buffer->unicode; 611 unsigned int count = buffer->len; 612 hb_glyph_info_t *info = buffer->info; 613 for (unsigned int i = 1; i < count; i++) 614 if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint))) 615 buffer->merge_clusters (i - 1, i + 1); 616 } 617 618 hb_auto_array_t<feature_record_t> feature_records; 619 hb_auto_array_t<range_record_t> range_records; 620 621 /* 622 * Set up features. 623 * (copied + modified from code from hb-uniscribe.cc) 624 */ 625 if (num_features) 626 { 627 /* Sort features by start/end events. */ 628 hb_auto_array_t<feature_event_t> feature_events; 629 for (unsigned int i = 0; i < num_features; i++) 630 { 631 const feature_mapping_t * mapping = (const feature_mapping_t *) bsearch (&features[i].tag, 632 feature_mappings, 633 ARRAY_LENGTH (feature_mappings), 634 sizeof (feature_mappings[0]), 635 _hb_feature_mapping_cmp); 636 if (!mapping) 637 continue; 638 639 active_feature_t feature; 640 feature.rec.feature = mapping->aatFeatureType; 641 feature.rec.setting = features[i].value ? mapping->selectorToEnable : mapping->selectorToDisable; 642 feature.order = i; 643 644 feature_event_t *event; 645 646 event = feature_events.push (); 647 if (unlikely (!event)) 648 goto fail_features; 649 event->index = features[i].start; 650 event->start = true; 651 event->feature = feature; 652 653 event = feature_events.push (); 654 if (unlikely (!event)) 655 goto fail_features; 656 event->index = features[i].end; 657 event->start = false; 658 event->feature = feature; 659 } 660 feature_events.qsort (); 661 /* Add a strategic final event. */ 662 { 663 active_feature_t feature; 664 feature.rec.feature = HB_TAG_NONE; 665 feature.rec.setting = 0; 666 feature.order = num_features + 1; 667 668 feature_event_t *event = feature_events.push (); 669 if (unlikely (!event)) 670 goto fail_features; 671 event->index = 0; /* This value does magic. */ 672 event->start = false; 673 event->feature = feature; 674 } 675 676 /* Scan events and save features for each range. */ 677 hb_auto_array_t<active_feature_t> active_features; 678 unsigned int last_index = 0; 679 for (unsigned int i = 0; i < feature_events.len; i++) 680 { 681 feature_event_t *event = &feature_events[i]; 682 683 if (event->index != last_index) 684 { 685 /* Save a snapshot of active features and the range. */ 686 range_record_t *range = range_records.push (); 687 if (unlikely (!range)) 688 goto fail_features; 689 690 if (active_features.len) 691 { 692 CFMutableArrayRef features_array = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks); 693 694 /* TODO sort and resolve conflicting features? */ 695 /* active_features.qsort (); */ 696 for (unsigned int j = 0; j < active_features.len; j++) 697 { 698 CFStringRef keys[] = { 699 kCTFontFeatureTypeIdentifierKey, 700 kCTFontFeatureSelectorIdentifierKey 701 }; 702 CFNumberRef values[] = { 703 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.feature), 704 CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &active_features[j].rec.setting) 705 }; 706 static_assert ((ARRAY_LENGTH_CONST (keys) == ARRAY_LENGTH_CONST (values)), ""); 707 CFDictionaryRef dict = CFDictionaryCreate (kCFAllocatorDefault, 708 (const void **) keys, 709 (const void **) values, 710 ARRAY_LENGTH (keys), 711 &kCFTypeDictionaryKeyCallBacks, 712 &kCFTypeDictionaryValueCallBacks); 713 for (unsigned int i = 0; i < ARRAY_LENGTH (values); i++) 714 CFRelease (values[i]); 715 716 CFArrayAppendValue (features_array, dict); 717 CFRelease (dict); 718 719 } 720 721 CFDictionaryRef attributes = CFDictionaryCreate (kCFAllocatorDefault, 722 (const void **) &kCTFontFeatureSettingsAttribute, 723 (const void **) &features_array, 724 1, 725 &kCFTypeDictionaryKeyCallBacks, 726 &kCFTypeDictionaryValueCallBacks); 727 CFRelease (features_array); 728 729 CTFontDescriptorRef font_desc = CTFontDescriptorCreateWithAttributes (attributes); 730 CFRelease (attributes); 731 732 range->font = CTFontCreateCopyWithAttributes (ct_font, 0.0, nullptr, font_desc); 733 CFRelease (font_desc); 734 } 735 else 736 { 737 range->font = nullptr; 738 } 739 740 range->index_first = last_index; 741 range->index_last = event->index - 1; 742 743 last_index = event->index; 744 } 745 746 if (event->start) { 747 active_feature_t *feature = active_features.push (); 748 if (unlikely (!feature)) 749 goto fail_features; 750 *feature = event->feature; 751 } else { 752 active_feature_t *feature = active_features.find (&event->feature); 753 if (feature) 754 active_features.remove (feature - active_features.array); 755 } 756 } 757 } 758 else 759 { 760 fail_features: 761 num_features = 0; 762 } 763 764 unsigned int scratch_size; 765 hb_buffer_t::scratch_buffer_t *scratch = buffer->get_scratch_buffer (&scratch_size); 766 767 #define ALLOCATE_ARRAY(Type, name, len, on_no_room) \ 768 Type *name = (Type *) scratch; \ 769 { \ 770 unsigned int _consumed = DIV_CEIL ((len) * sizeof (Type), sizeof (*scratch)); \ 771 if (unlikely (_consumed > scratch_size)) \ 772 { \ 773 on_no_room; \ 774 assert (0); \ 775 } \ 776 scratch += _consumed; \ 777 scratch_size -= _consumed; \ 778 } 779 780 ALLOCATE_ARRAY (UniChar, pchars, buffer->len * 2, /*nothing*/); 781 unsigned int chars_len = 0; 782 for (unsigned int i = 0; i < buffer->len; i++) { 783 hb_codepoint_t c = buffer->info[i].codepoint; 784 if (likely (c <= 0xFFFFu)) 785 pchars[chars_len++] = c; 786 else if (unlikely (c > 0x10FFFFu)) 787 pchars[chars_len++] = 0xFFFDu; 788 else { 789 pchars[chars_len++] = 0xD800u + ((c - 0x10000u) >> 10); 790 pchars[chars_len++] = 0xDC00u + ((c - 0x10000u) & ((1u << 10) - 1)); 791 } 792 } 793 794 ALLOCATE_ARRAY (unsigned int, log_clusters, chars_len, /*nothing*/); 795 chars_len = 0; 796 for (unsigned int i = 0; i < buffer->len; i++) 797 { 798 hb_codepoint_t c = buffer->info[i].codepoint; 799 unsigned int cluster = buffer->info[i].cluster; 800 log_clusters[chars_len++] = cluster; 801 if (hb_in_range (c, 0x10000u, 0x10FFFFu)) 802 log_clusters[chars_len++] = cluster; /* Surrogates. */ 803 } 804 805 #define FAIL(...) \ 806 HB_STMT_START { \ 807 DEBUG_MSG (CORETEXT, nullptr, __VA_ARGS__); \ 808 ret = false; \ 809 goto fail; \ 810 } HB_STMT_END; 811 812 bool ret = true; 813 CFStringRef string_ref = nullptr; 814 CTLineRef line = nullptr; 815 816 if (0) 817 { 818 resize_and_retry: 819 DEBUG_MSG (CORETEXT, buffer, "Buffer resize"); 820 /* string_ref uses the scratch-buffer for backing store, and line references 821 * string_ref (via attr_string). We must release those before resizing buffer. */ 822 assert (string_ref); 823 assert (line); 824 CFRelease (string_ref); 825 CFRelease (line); 826 string_ref = nullptr; 827 line = nullptr; 828 829 /* Get previous start-of-scratch-area, that we use later for readjusting 830 * our existing scratch arrays. */ 831 unsigned int old_scratch_used; 832 hb_buffer_t::scratch_buffer_t *old_scratch; 833 old_scratch = buffer->get_scratch_buffer (&old_scratch_used); 834 old_scratch_used = scratch - old_scratch; 835 836 if (unlikely (!buffer->ensure (buffer->allocated * 2))) 837 FAIL ("Buffer resize failed"); 838 839 /* Adjust scratch, pchars, and log_cluster arrays. This is ugly, but really the 840 * cleanest way to do without completely restructuring the rest of this shaper. */ 841 scratch = buffer->get_scratch_buffer (&scratch_size); 842 pchars = reinterpret_cast<UniChar *> (((char *) scratch + ((char *) pchars - (char *) old_scratch))); 843 log_clusters = reinterpret_cast<unsigned int *> (((char *) scratch + ((char *) log_clusters - (char *) old_scratch))); 844 scratch += old_scratch_used; 845 scratch_size -= old_scratch_used; 846 } 847 { 848 string_ref = CFStringCreateWithCharactersNoCopy (nullptr, 849 pchars, chars_len, 850 kCFAllocatorNull); 851 if (unlikely (!string_ref)) 852 FAIL ("CFStringCreateWithCharactersNoCopy failed"); 853 854 /* Create an attributed string, populate it, and create a line from it, then release attributed string. */ 855 { 856 CFMutableAttributedStringRef attr_string = CFAttributedStringCreateMutable (kCFAllocatorDefault, 857 chars_len); 858 if (unlikely (!attr_string)) 859 FAIL ("CFAttributedStringCreateMutable failed"); 860 CFAttributedStringReplaceString (attr_string, CFRangeMake (0, 0), string_ref); 861 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) 862 { 863 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), 864 kCTVerticalFormsAttributeName, kCFBooleanTrue); 865 } 866 867 if (buffer->props.language) 868 { 869 /* What's the iOS equivalent of this check? 870 * The symbols was introduced in iOS 7.0. 871 * At any rate, our fallback is safe and works fine. */ 872 #if MAC_OS_X_VERSION_MIN_REQUIRED < 1090 873 # define kCTLanguageAttributeName CFSTR ("NSLanguage") 874 #endif 875 CFStringRef lang = CFStringCreateWithCStringNoCopy (kCFAllocatorDefault, 876 hb_language_to_string (buffer->props.language), 877 kCFStringEncodingUTF8, 878 kCFAllocatorNull); 879 if (unlikely (!lang)) 880 FAIL ("CFStringCreateWithCStringNoCopy failed"); 881 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), 882 kCTLanguageAttributeName, lang); 883 CFRelease (lang); 884 } 885 CFAttributedStringSetAttribute (attr_string, CFRangeMake (0, chars_len), 886 kCTFontAttributeName, ct_font); 887 888 if (num_features && range_records.len) 889 { 890 unsigned int start = 0; 891 range_record_t *last_range = &range_records[0]; 892 for (unsigned int k = 0; k < chars_len; k++) 893 { 894 range_record_t *range = last_range; 895 while (log_clusters[k] < range->index_first) 896 range--; 897 while (log_clusters[k] > range->index_last) 898 range++; 899 if (range != last_range) 900 { 901 if (last_range->font) 902 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, k - start), 903 kCTFontAttributeName, last_range->font); 904 905 start = k; 906 } 907 908 last_range = range; 909 } 910 if (start != chars_len && last_range->font) 911 CFAttributedStringSetAttribute (attr_string, CFRangeMake (start, chars_len - start), 912 kCTFontAttributeName, last_range->font); 913 } 914 /* Enable/disable kern if requested. 915 * 916 * Note: once kern is disabled, reenabling it doesn't currently seem to work in CoreText. 917 */ 918 if (num_features) 919 { 920 unsigned int zeroint = 0; 921 CFNumberRef zero = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &zeroint); 922 for (unsigned int i = 0; i < num_features; i++) 923 { 924 const hb_feature_t &feature = features[i]; 925 if (feature.tag == HB_TAG('k','e','r','n') && 926 feature.start < chars_len && feature.start < feature.end) 927 { 928 CFRange feature_range = CFRangeMake (feature.start, 929 MIN (feature.end, chars_len) - feature.start); 930 if (feature.value) 931 CFAttributedStringRemoveAttribute (attr_string, feature_range, kCTKernAttributeName); 932 else 933 CFAttributedStringSetAttribute (attr_string, feature_range, kCTKernAttributeName, zero); 934 } 935 } 936 CFRelease (zero); 937 } 938 939 int level = HB_DIRECTION_IS_FORWARD (buffer->props.direction) ? 0 : 1; 940 CFNumberRef level_number = CFNumberCreate (kCFAllocatorDefault, kCFNumberIntType, &level); 941 CFDictionaryRef options = CFDictionaryCreate (kCFAllocatorDefault, 942 (const void **) &kCTTypesetterOptionForcedEmbeddingLevel, 943 (const void **) &level_number, 944 1, 945 &kCFTypeDictionaryKeyCallBacks, 946 &kCFTypeDictionaryValueCallBacks); 947 CFRelease (level_number); 948 if (unlikely (!options)) 949 FAIL ("CFDictionaryCreate failed"); 950 951 CTTypesetterRef typesetter = CTTypesetterCreateWithAttributedStringAndOptions (attr_string, options); 952 CFRelease (options); 953 CFRelease (attr_string); 954 if (unlikely (!typesetter)) 955 FAIL ("CTTypesetterCreateWithAttributedStringAndOptions failed"); 956 957 line = CTTypesetterCreateLine (typesetter, CFRangeMake(0, 0)); 958 CFRelease (typesetter); 959 if (unlikely (!line)) 960 FAIL ("CTTypesetterCreateLine failed"); 961 } 962 963 CFArrayRef glyph_runs = CTLineGetGlyphRuns (line); 964 unsigned int num_runs = CFArrayGetCount (glyph_runs); 965 DEBUG_MSG (CORETEXT, nullptr, "Num runs: %d", num_runs); 966 967 buffer->len = 0; 968 uint32_t status_and = ~0, status_or = 0; 969 double advances_so_far = 0; 970 /* For right-to-left runs, CoreText returns the glyphs positioned such that 971 * any trailing whitespace is to the left of (0,0). Adjust coordinate system 972 * to fix for that. Test with any RTL string with trailing spaces. 973 * https://code.google.com/p/chromium/issues/detail?id=469028 974 */ 975 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) 976 { 977 advances_so_far -= CTLineGetTrailingWhitespaceWidth (line); 978 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) 979 advances_so_far = -advances_so_far; 980 } 981 982 const CFRange range_all = CFRangeMake (0, 0); 983 984 for (unsigned int i = 0; i < num_runs; i++) 985 { 986 CTRunRef run = static_cast<CTRunRef>(CFArrayGetValueAtIndex (glyph_runs, i)); 987 CTRunStatus run_status = CTRunGetStatus (run); 988 status_or |= run_status; 989 status_and &= run_status; 990 DEBUG_MSG (CORETEXT, run, "CTRunStatus: %x", run_status); 991 double run_advance = CTRunGetTypographicBounds (run, range_all, nullptr, nullptr, nullptr); 992 if (HB_DIRECTION_IS_VERTICAL (buffer->props.direction)) 993 run_advance = -run_advance; 994 DEBUG_MSG (CORETEXT, run, "Run advance: %g", run_advance); 995 996 /* CoreText does automatic font fallback (AKA "cascading") for characters 997 * not supported by the requested font, and provides no way to turn it off, 998 * so we must detect if the returned run uses a font other than the requested 999 * one and fill in the buffer with .notdef glyphs instead of random glyph 1000 * indices from a different font. 1001 */ 1002 CFDictionaryRef attributes = CTRunGetAttributes (run); 1003 CTFontRef run_ct_font = static_cast<CTFontRef>(CFDictionaryGetValue (attributes, kCTFontAttributeName)); 1004 if (!CFEqual (run_ct_font, ct_font)) 1005 { 1006 /* The run doesn't use our main font instance. We have to figure out 1007 * whether font fallback happened, or this is just CoreText giving us 1008 * another CTFont using the same underlying CGFont. CoreText seems 1009 * to do that in a variety of situations, one of which being vertical 1010 * text, but also perhaps for caching reasons. 1011 * 1012 * First, see if it uses any of our subfonts created to set font features... 1013 * 1014 * Next, compare the CGFont to the one we used to create our fonts. 1015 * Even this doesn't work all the time. 1016 * 1017 * Finally, we compare PS names, which I don't think are unique... 1018 * 1019 * Looks like if we really want to be sure here we have to modify the 1020 * font to change the name table, similar to what we do in the uniscribe 1021 * backend. 1022 * 1023 * However, even that wouldn't work if we were passed in the CGFont to 1024 * construct a hb_face to begin with. 1025 * 1026 * See: http://github.com/harfbuzz/harfbuzz/pull/36 1027 * 1028 * Also see: https://bugs.chromium.org/p/chromium/issues/detail?id=597098 1029 */ 1030 bool matched = false; 1031 for (unsigned int i = 0; i < range_records.len; i++) 1032 if (range_records[i].font && CFEqual (run_ct_font, range_records[i].font)) 1033 { 1034 matched = true; 1035 break; 1036 } 1037 if (!matched) 1038 { 1039 CGFontRef run_cg_font = CTFontCopyGraphicsFont (run_ct_font, 0); 1040 if (run_cg_font) 1041 { 1042 matched = CFEqual (run_cg_font, cg_font); 1043 CFRelease (run_cg_font); 1044 } 1045 } 1046 if (!matched) 1047 { 1048 CFStringRef font_ps_name = CTFontCopyName (ct_font, kCTFontPostScriptNameKey); 1049 CFStringRef run_ps_name = CTFontCopyName (run_ct_font, kCTFontPostScriptNameKey); 1050 CFComparisonResult result = CFStringCompare (run_ps_name, font_ps_name, 0); 1051 CFRelease (run_ps_name); 1052 CFRelease (font_ps_name); 1053 if (result == kCFCompareEqualTo) 1054 matched = true; 1055 } 1056 if (!matched) 1057 { 1058 CFRange range = CTRunGetStringRange (run); 1059 DEBUG_MSG (CORETEXT, run, "Run used fallback font: %ld..%ld", 1060 range.location, range.location + range.length); 1061 if (!buffer->ensure_inplace (buffer->len + range.length)) 1062 goto resize_and_retry; 1063 hb_glyph_info_t *info = buffer->info + buffer->len; 1064 1065 hb_codepoint_t notdef = 0; 1066 hb_direction_t dir = buffer->props.direction; 1067 hb_position_t x_advance, y_advance, x_offset, y_offset; 1068 hb_font_get_glyph_advance_for_direction (font, notdef, dir, &x_advance, &y_advance); 1069 hb_font_get_glyph_origin_for_direction (font, notdef, dir, &x_offset, &y_offset); 1070 hb_position_t advance = x_advance + y_advance; 1071 x_offset = -x_offset; 1072 y_offset = -y_offset; 1073 1074 unsigned int old_len = buffer->len; 1075 for (CFIndex j = range.location; j < range.location + range.length; j++) 1076 { 1077 UniChar ch = CFStringGetCharacterAtIndex (string_ref, j); 1078 if (hb_in_range<UniChar> (ch, 0xDC00u, 0xDFFFu) && range.location < j) 1079 { 1080 ch = CFStringGetCharacterAtIndex (string_ref, j - 1); 1081 if (hb_in_range<UniChar> (ch, 0xD800u, 0xDBFFu)) 1082 /* This is the second of a surrogate pair. Don't need .notdef 1083 * for this one. */ 1084 continue; 1085 } 1086 if (buffer->unicode->is_default_ignorable (ch)) 1087 continue; 1088 1089 info->codepoint = notdef; 1090 info->cluster = log_clusters[j]; 1091 1092 info->mask = advance; 1093 info->var1.i32 = x_offset; 1094 info->var2.i32 = y_offset; 1095 1096 info++; 1097 buffer->len++; 1098 } 1099 if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction)) 1100 buffer->reverse_range (old_len, buffer->len); 1101 advances_so_far += run_advance; 1102 continue; 1103 } 1104 } 1105 1106 unsigned int num_glyphs = CTRunGetGlyphCount (run); 1107 if (num_glyphs == 0) 1108 continue; 1109 1110 if (!buffer->ensure_inplace (buffer->len + num_glyphs)) 1111 goto resize_and_retry; 1112 1113 hb_glyph_info_t *run_info = buffer->info + buffer->len; 1114 1115 /* Testing used to indicate that CTRunGetGlyphsPtr, etc (almost?) always 1116 * succeed, and so copying data to our own buffer will be rare. Reports 1117 * have it that this changed in OS X 10.10 Yosemite, and nullptr is returned 1118 * frequently. At any rate, we can test that codepath by setting USE_PTR 1119 * to false. */ 1120 1121 #define USE_PTR true 1122 1123 #define SCRATCH_SAVE() \ 1124 unsigned int scratch_size_saved = scratch_size; \ 1125 hb_buffer_t::scratch_buffer_t *scratch_saved = scratch 1126 1127 #define SCRATCH_RESTORE() \ 1128 scratch_size = scratch_size_saved; \ 1129 scratch = scratch_saved; 1130 1131 { /* Setup glyphs */ 1132 SCRATCH_SAVE(); 1133 const CGGlyph* glyphs = USE_PTR ? CTRunGetGlyphsPtr (run) : nullptr; 1134 if (!glyphs) { 1135 ALLOCATE_ARRAY (CGGlyph, glyph_buf, num_glyphs, goto resize_and_retry); 1136 CTRunGetGlyphs (run, range_all, glyph_buf); 1137 glyphs = glyph_buf; 1138 } 1139 const CFIndex* string_indices = USE_PTR ? CTRunGetStringIndicesPtr (run) : nullptr; 1140 if (!string_indices) { 1141 ALLOCATE_ARRAY (CFIndex, index_buf, num_glyphs, goto resize_and_retry); 1142 CTRunGetStringIndices (run, range_all, index_buf); 1143 string_indices = index_buf; 1144 } 1145 hb_glyph_info_t *info = run_info; 1146 for (unsigned int j = 0; j < num_glyphs; j++) 1147 { 1148 info->codepoint = glyphs[j]; 1149 info->cluster = log_clusters[string_indices[j]]; 1150 info++; 1151 } 1152 SCRATCH_RESTORE(); 1153 } 1154 { 1155 /* Setup positions. 1156 * Note that CoreText does not return advances for glyphs. As such, 1157 * for all but last glyph, we use the delta position to next glyph as 1158 * advance (in the advance direction only), and for last glyph we set 1159 * whatever is needed to make the whole run's advance add up. */ 1160 SCRATCH_SAVE(); 1161 const CGPoint* positions = USE_PTR ? CTRunGetPositionsPtr (run) : nullptr; 1162 if (!positions) { 1163 ALLOCATE_ARRAY (CGPoint, position_buf, num_glyphs, goto resize_and_retry); 1164 CTRunGetPositions (run, range_all, position_buf); 1165 positions = position_buf; 1166 } 1167 hb_glyph_info_t *info = run_info; 1168 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction)) 1169 { 1170 hb_position_t x_offset = (positions[0].x - advances_so_far) * x_mult; 1171 for (unsigned int j = 0; j < num_glyphs; j++) 1172 { 1173 double advance; 1174 if (likely (j + 1 < num_glyphs)) 1175 advance = positions[j + 1].x - positions[j].x; 1176 else /* last glyph */ 1177 advance = run_advance - (positions[j].x - positions[0].x); 1178 info->mask = advance * x_mult; 1179 info->var1.i32 = x_offset; 1180 info->var2.i32 = positions[j].y * y_mult; 1181 info++; 1182 } 1183 } 1184 else 1185 { 1186 hb_position_t y_offset = (positions[0].y - advances_so_far) * y_mult; 1187 for (unsigned int j = 0; j < num_glyphs; j++) 1188 { 1189 double advance; 1190 if (likely (j + 1 < num_glyphs)) 1191 advance = positions[j + 1].y - positions[j].y; 1192 else /* last glyph */ 1193 advance = run_advance - (positions[j].y - positions[0].y); 1194 info->mask = advance * y_mult; 1195 info->var1.i32 = positions[j].x * x_mult; 1196 info->var2.i32 = y_offset; 1197 info++; 1198 } 1199 } 1200 SCRATCH_RESTORE(); 1201 advances_so_far += run_advance; 1202 } 1203 #undef SCRATCH_RESTORE 1204 #undef SCRATCH_SAVE 1205 #undef USE_PTR 1206 #undef ALLOCATE_ARRAY 1207 1208 buffer->len += num_glyphs; 1209 } 1210 1211 /* Mac OS 10.6 doesn't have kCTTypesetterOptionForcedEmbeddingLevel, 1212 * or if it does, it doesn't resepct it. So we get runs with wrong 1213 * directions. As such, disable the assert... It wouldn't crash, but 1214 * cursoring will be off... 1215 * 1216 * http://crbug.com/419769 1217 */ 1218 if (0) 1219 { 1220 /* Make sure all runs had the expected direction. */ 1221 bool backward = HB_DIRECTION_IS_BACKWARD (buffer->props.direction); 1222 assert (bool (status_and & kCTRunStatusRightToLeft) == backward); 1223 assert (bool (status_or & kCTRunStatusRightToLeft) == backward); 1224 } 1225 1226 buffer->clear_positions (); 1227 1228 unsigned int count = buffer->len; 1229 hb_glyph_info_t *info = buffer->info; 1230 hb_glyph_position_t *pos = buffer->pos; 1231 if (HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction)) 1232 for (unsigned int i = 0; i < count; i++) 1233 { 1234 pos->x_advance = info->mask; 1235 pos->x_offset = info->var1.i32; 1236 pos->y_offset = info->var2.i32; 1237 1238 info->mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK; 1239 1240 info++, pos++; 1241 } 1242 else 1243 for (unsigned int i = 0; i < count; i++) 1244 { 1245 pos->y_advance = info->mask; 1246 pos->x_offset = info->var1.i32; 1247 pos->y_offset = info->var2.i32; 1248 1249 info->mask = HB_GLYPH_FLAG_UNSAFE_TO_BREAK; 1250 1251 info++, pos++; 1252 } 1253 1254 /* Fix up clusters so that we never return out-of-order indices; 1255 * if core text has reordered glyphs, we'll merge them to the 1256 * beginning of the reordered cluster. CoreText is nice enough 1257 * to tell us whenever it has produced nonmonotonic results... 1258 * Note that we assume the input clusters were nonmonotonic to 1259 * begin with. 1260 * 1261 * This does *not* mean we'll form the same clusters as Uniscribe 1262 * or the native OT backend, only that the cluster indices will be 1263 * monotonic in the output buffer. */ 1264 if (count > 1 && (status_or & kCTRunStatusNonMonotonic)) 1265 { 1266 hb_glyph_info_t *info = buffer->info; 1267 if (HB_DIRECTION_IS_FORWARD (buffer->props.direction)) 1268 { 1269 unsigned int cluster = info[count - 1].cluster; 1270 for (unsigned int i = count - 1; i > 0; i--) 1271 { 1272 cluster = MIN (cluster, info[i - 1].cluster); 1273 info[i - 1].cluster = cluster; 1274 } 1275 } 1276 else 1277 { 1278 unsigned int cluster = info[0].cluster; 1279 for (unsigned int i = 1; i < count; i++) 1280 { 1281 cluster = MIN (cluster, info[i].cluster); 1282 info[i].cluster = cluster; 1283 } 1284 } 1285 } 1286 } 1287 1288 buffer->unsafe_to_break_all (); 1289 1290 #undef FAIL 1291 1292 fail: 1293 if (string_ref) 1294 CFRelease (string_ref); 1295 if (line) 1296 CFRelease (line); 1297 1298 for (unsigned int i = 0; i < range_records.len; i++) 1299 if (range_records[i].font) 1300 CFRelease (range_records[i].font); 1301 1302 return ret; 1303 } 1304 1305 1306 /* 1307 * AAT shaper 1308 */ 1309 1310 HB_SHAPER_DATA_ENSURE_DEFINE(coretext_aat, face) 1311 HB_SHAPER_DATA_ENSURE_DEFINE(coretext_aat, font) 1312 1313 /* 1314 * shaper face data 1315 */ 1316 1317 struct hb_coretext_aat_shaper_face_data_t {}; 1318 1319 hb_coretext_aat_shaper_face_data_t * 1320 _hb_coretext_aat_shaper_face_data_create (hb_face_t *face) 1321 { 1322 static const hb_tag_t tags[] = {HB_CORETEXT_TAG_MORX, HB_CORETEXT_TAG_MORT, HB_CORETEXT_TAG_KERX}; 1323 1324 for (unsigned int i = 0; i < ARRAY_LENGTH (tags); i++) 1325 { 1326 hb_blob_t *blob = face->reference_table (tags[i]); 1327 if (hb_blob_get_length (blob)) 1328 { 1329 hb_blob_destroy (blob); 1330 return hb_coretext_shaper_face_data_ensure (face) ? (hb_coretext_aat_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED : nullptr; 1331 } 1332 hb_blob_destroy (blob); 1333 } 1334 1335 return nullptr; 1336 } 1337 1338 void 1339 _hb_coretext_aat_shaper_face_data_destroy (hb_coretext_aat_shaper_face_data_t *data HB_UNUSED) 1340 { 1341 } 1342 1343 1344 /* 1345 * shaper font data 1346 */ 1347 1348 struct hb_coretext_aat_shaper_font_data_t {}; 1349 1350 hb_coretext_aat_shaper_font_data_t * 1351 _hb_coretext_aat_shaper_font_data_create (hb_font_t *font) 1352 { 1353 return hb_coretext_shaper_font_data_ensure (font) ? (hb_coretext_aat_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED : nullptr; 1354 } 1355 1356 void 1357 _hb_coretext_aat_shaper_font_data_destroy (hb_coretext_aat_shaper_font_data_t *data HB_UNUSED) 1358 { 1359 } 1360 1361 1362 /* 1363 * shaper shape_plan data 1364 */ 1365 1366 struct hb_coretext_aat_shaper_shape_plan_data_t {}; 1367 1368 hb_coretext_aat_shaper_shape_plan_data_t * 1369 _hb_coretext_aat_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, 1370 const hb_feature_t *user_features HB_UNUSED, 1371 unsigned int num_user_features HB_UNUSED, 1372 const int *coords HB_UNUSED, 1373 unsigned int num_coords HB_UNUSED) 1374 { 1375 return (hb_coretext_aat_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; 1376 } 1377 1378 void 1379 _hb_coretext_aat_shaper_shape_plan_data_destroy (hb_coretext_aat_shaper_shape_plan_data_t *data HB_UNUSED) 1380 { 1381 } 1382 1383 1384 /* 1385 * shaper 1386 */ 1387 1388 hb_bool_t 1389 _hb_coretext_aat_shape (hb_shape_plan_t *shape_plan, 1390 hb_font_t *font, 1391 hb_buffer_t *buffer, 1392 const hb_feature_t *features, 1393 unsigned int num_features) 1394 { 1395 return _hb_coretext_shape (shape_plan, font, buffer, features, num_features); 1396 } 1397
