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