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