1 /* 2 * (C) Copyright IBM Corp. and others 1998-2015 - All Rights Reserved 3 */ 4 5 #include "LETypes.h" 6 #include "LEScripts.h" 7 #include "LELanguages.h" 8 #include "LESwaps.h" 9 10 #include "LayoutEngine.h" 11 #include "ArabicLayoutEngine.h" 12 #include "CanonShaping.h" 13 #include "HanLayoutEngine.h" 14 #include "HangulLayoutEngine.h" 15 #include "IndicLayoutEngine.h" 16 #include "KhmerLayoutEngine.h" 17 #include "ThaiLayoutEngine.h" 18 #include "TibetanLayoutEngine.h" 19 #include "GXLayoutEngine.h" 20 #include "GXLayoutEngine2.h" 21 22 #include "ScriptAndLanguageTags.h" 23 #include "CharSubstitutionFilter.h" 24 25 #include "LEGlyphStorage.h" 26 27 #include "OpenTypeUtilities.h" 28 #include "GlyphSubstitutionTables.h" 29 #include "GlyphDefinitionTables.h" 30 #include "MorphTables.h" 31 32 #include "DefaultCharMapper.h" 33 34 #include "KernTable.h" 35 36 U_NAMESPACE_BEGIN 37 38 /* Leave this copyright notice here! It needs to go somewhere in this library. */ 39 static const char copyright[] = U_COPYRIGHT_STRING; 40 41 /* TODO: remove these? */ 42 const le_int32 LayoutEngine::kTypoFlagKern = LE_Kerning_FEATURE_FLAG; 43 const le_int32 LayoutEngine::kTypoFlagLiga = LE_Ligatures_FEATURE_FLAG; 44 45 const LEUnicode32 DefaultCharMapper::controlChars[] = { 46 0x0009, 0x000A, 0x000D, 47 /*0x200C, 0x200D,*/ 0x200E, 0x200F, 48 0x2028, 0x2029, 0x202A, 0x202B, 0x202C, 0x202D, 0x202E, 49 0x206A, 0x206B, 0x206C, 0x206D, 0x206E, 0x206F 50 }; 51 52 const le_int32 DefaultCharMapper::controlCharsCount = LE_ARRAY_SIZE(controlChars); 53 54 LEUnicode32 DefaultCharMapper::mapChar(LEUnicode32 ch) const 55 { 56 (void)copyright; // Suppress unused variable warning. 57 if (fFilterControls) { 58 le_int32 index = OpenTypeUtilities::search((le_uint32)ch, (le_uint32 *)controlChars, controlCharsCount); 59 60 if (controlChars[index] == ch) { 61 return 0xFFFF; 62 } 63 } 64 65 if (fMirror) { 66 le_int32 index = OpenTypeUtilities::search((le_uint32) ch, (le_uint32 *)DefaultCharMapper::mirroredChars, DefaultCharMapper::mirroredCharsCount); 67 68 if (mirroredChars[index] == ch) { 69 return DefaultCharMapper::srahCderorrim[index]; 70 } 71 } 72 73 return ch; 74 } 75 76 // This is here to get it out of LEGlyphFilter.h. 77 // No particular reason to put it here, other than 78 // this is a good central location... 79 LEGlyphFilter::~LEGlyphFilter() 80 { 81 // nothing to do 82 } 83 84 CharSubstitutionFilter::CharSubstitutionFilter(const LEFontInstance *fontInstance) 85 : fFontInstance(fontInstance) 86 { 87 // nothing to do 88 } 89 90 CharSubstitutionFilter::~CharSubstitutionFilter() 91 { 92 // nothing to do 93 } 94 95 class CanonMarkFilter : public UMemory, public LEGlyphFilter 96 { 97 private: 98 const LEReferenceTo<GlyphClassDefinitionTable> classDefTable; 99 100 CanonMarkFilter(const CanonMarkFilter &other); // forbid copying of this class 101 CanonMarkFilter &operator=(const CanonMarkFilter &other); // forbid copying of this class 102 103 public: 104 CanonMarkFilter(const LEReferenceTo<GlyphDefinitionTableHeader> &gdefTable, LEErrorCode &success); 105 virtual ~CanonMarkFilter(); 106 107 virtual le_bool accept(LEGlyphID glyph) const; 108 }; 109 110 CanonMarkFilter::CanonMarkFilter(const LEReferenceTo<GlyphDefinitionTableHeader> &gdefTable, LEErrorCode &success) 111 : classDefTable(gdefTable->getMarkAttachClassDefinitionTable(gdefTable, success)) 112 { 113 } 114 115 CanonMarkFilter::~CanonMarkFilter() 116 { 117 // nothing to do? 118 } 119 120 le_bool CanonMarkFilter::accept(LEGlyphID glyph) const 121 { 122 LEErrorCode success = LE_NO_ERROR; 123 le_int32 glyphClass = classDefTable->getGlyphClass(classDefTable, glyph, success); 124 if(LE_FAILURE(success)) return false; 125 return glyphClass != 0; 126 } 127 128 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LayoutEngine) 129 130 #define ccmpFeatureTag LE_CCMP_FEATURE_TAG 131 132 #define ccmpFeatureMask 0x80000000UL 133 134 #define canonFeatures (ccmpFeatureMask) 135 136 static const FeatureMap canonFeatureMap[] = 137 { 138 {ccmpFeatureTag, ccmpFeatureMask} 139 }; 140 141 static const le_int32 canonFeatureMapCount = LE_ARRAY_SIZE(canonFeatureMap); 142 143 LayoutEngine::LayoutEngine(const LEFontInstance *fontInstance, 144 le_int32 scriptCode, 145 le_int32 languageCode, 146 le_int32 typoFlags, 147 LEErrorCode &success) 148 : fGlyphStorage(NULL), fFontInstance(fontInstance), fScriptCode(scriptCode), fLanguageCode(languageCode), 149 fTypoFlags(typoFlags), fFilterZeroWidth(TRUE) 150 { 151 if (LE_FAILURE(success)) { 152 return; 153 } 154 155 fGlyphStorage = new LEGlyphStorage(); 156 if (fGlyphStorage == NULL) { 157 success = LE_MEMORY_ALLOCATION_ERROR; 158 } 159 } 160 161 le_int32 LayoutEngine::getGlyphCount() const 162 { 163 return fGlyphStorage->getGlyphCount(); 164 } 165 166 void LayoutEngine::getCharIndices(le_int32 charIndices[], le_int32 indexBase, LEErrorCode &success) const 167 { 168 fGlyphStorage->getCharIndices(charIndices, indexBase, success); 169 } 170 171 void LayoutEngine::getCharIndices(le_int32 charIndices[], LEErrorCode &success) const 172 { 173 fGlyphStorage->getCharIndices(charIndices, success); 174 } 175 176 // Copy the glyphs into caller's (32-bit) glyph array, OR in extraBits 177 void LayoutEngine::getGlyphs(le_uint32 glyphs[], le_uint32 extraBits, LEErrorCode &success) const 178 { 179 fGlyphStorage->getGlyphs(glyphs, extraBits, success); 180 } 181 182 void LayoutEngine::getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const 183 { 184 fGlyphStorage->getGlyphs(glyphs, success); 185 } 186 187 188 void LayoutEngine::getGlyphPositions(float positions[], LEErrorCode &success) const 189 { 190 fGlyphStorage->getGlyphPositions(positions, success); 191 } 192 193 void LayoutEngine::getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const 194 { 195 fGlyphStorage->getGlyphPosition(glyphIndex, x, y, success); 196 } 197 198 le_int32 LayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, 199 LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success) 200 { 201 if (LE_FAILURE(success)) { 202 return 0; 203 } 204 205 if (offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { 206 success = LE_ILLEGAL_ARGUMENT_ERROR; 207 return 0; 208 } 209 210 LEReferenceTo<GlyphSubstitutionTableHeader> canonGSUBTable((GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable); 211 LETag scriptTag = OpenTypeLayoutEngine::getScriptTag(fScriptCode); 212 LETag langSysTag = OpenTypeLayoutEngine::getLangSysTag(fLanguageCode); 213 le_int32 i, dir = 1, out = 0, outCharCount = count; 214 215 if (canonGSUBTable->coversScript(canonGSUBTable,scriptTag, success) || LE_SUCCESS(success)) { 216 CharSubstitutionFilter *substitutionFilter = new CharSubstitutionFilter(fFontInstance); 217 if (substitutionFilter == NULL) { 218 success = LE_MEMORY_ALLOCATION_ERROR; 219 return 0; 220 } 221 222 const LEUnicode *inChars = &chars[offset]; 223 LEUnicode *reordered = NULL; 224 LEGlyphStorage fakeGlyphStorage; 225 226 fakeGlyphStorage.allocateGlyphArray(count, rightToLeft, success); 227 228 if (LE_FAILURE(success)) { 229 delete substitutionFilter; 230 return 0; 231 } 232 233 // This is the cheapest way to get mark reordering only for Hebrew. 234 // We could just do the mark reordering for all scripts, but most 235 // of them probably don't need it... 236 if (fScriptCode == hebrScriptCode) { 237 reordered = LE_NEW_ARRAY(LEUnicode, count); 238 239 if (reordered == NULL) { 240 delete substitutionFilter; 241 success = LE_MEMORY_ALLOCATION_ERROR; 242 return 0; 243 } 244 245 CanonShaping::reorderMarks(&chars[offset], count, rightToLeft, reordered, fakeGlyphStorage); 246 inChars = reordered; 247 } 248 249 fakeGlyphStorage.allocateAuxData(success); 250 251 if (LE_FAILURE(success)) { 252 delete substitutionFilter; 253 return 0; 254 } 255 256 if (rightToLeft) { 257 out = count - 1; 258 dir = -1; 259 } 260 261 for (i = 0; i < count; i += 1, out += dir) { 262 fakeGlyphStorage[out] = (LEGlyphID) inChars[i]; 263 fakeGlyphStorage.setAuxData(out, canonFeatures, success); 264 } 265 266 if (reordered != NULL) { 267 LE_DELETE_ARRAY(reordered); 268 } 269 270 outCharCount = canonGSUBTable->process(canonGSUBTable, fakeGlyphStorage, rightToLeft, scriptTag, langSysTag, (const GlyphDefinitionTableHeader*)NULL, substitutionFilter, canonFeatureMap, canonFeatureMapCount, FALSE, success); 271 272 if (LE_FAILURE(success)) { 273 delete substitutionFilter; 274 return 0; 275 } 276 277 out = (rightToLeft? outCharCount - 1 : 0); 278 279 /* 280 * The char indices array in fakeGlyphStorage has the correct mapping 281 * back to the original input characters. Save it in glyphStorage. The 282 * subsequent call to glyphStoratge.allocateGlyphArray will keep this 283 * array rather than allocating and initializing a new one. 284 */ 285 glyphStorage.adoptCharIndicesArray(fakeGlyphStorage); 286 287 outChars = LE_NEW_ARRAY(LEUnicode, outCharCount); 288 289 if (outChars == NULL) { 290 delete substitutionFilter; 291 success = LE_MEMORY_ALLOCATION_ERROR; 292 return 0; 293 } 294 295 for (i = 0; i < outCharCount; i += 1, out += dir) { 296 outChars[out] = (LEUnicode) LE_GET_GLYPH(fakeGlyphStorage[i]); 297 } 298 299 delete substitutionFilter; 300 } 301 302 return outCharCount; 303 } 304 305 le_int32 LayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, 306 LEGlyphStorage &glyphStorage, LEErrorCode &success) 307 { 308 if (LE_FAILURE(success)) { 309 return 0; 310 } 311 312 if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { 313 success = LE_ILLEGAL_ARGUMENT_ERROR; 314 return 0; 315 } 316 317 LEUnicode *outChars = NULL; 318 le_int32 outCharCount = characterProcessing(chars, offset, count, max, rightToLeft, outChars, glyphStorage, success); 319 320 if (outChars != NULL) { 321 mapCharsToGlyphs(outChars, 0, outCharCount, rightToLeft, rightToLeft, glyphStorage, success); 322 LE_DELETE_ARRAY(outChars); // FIXME: a subclass may have allocated this, in which case this delete might not work... 323 } else { 324 mapCharsToGlyphs(chars, offset, count, rightToLeft, rightToLeft, glyphStorage, success); 325 } 326 327 return glyphStorage.getGlyphCount(); 328 } 329 330 // Input: glyphs 331 // Output: positions 332 void LayoutEngine::positionGlyphs(LEGlyphStorage &glyphStorage, float x, float y, LEErrorCode &success) 333 { 334 if (LE_FAILURE(success)) { 335 return; 336 } 337 338 glyphStorage.allocatePositions(success); 339 340 if (LE_FAILURE(success)) { 341 return; 342 } 343 344 le_int32 i, glyphCount = glyphStorage.getGlyphCount(); 345 346 for (i = 0; i < glyphCount; i += 1) { 347 LEPoint advance; 348 349 glyphStorage.setPosition(i, x, y, success); 350 351 fFontInstance->getGlyphAdvance(glyphStorage[i], advance); 352 x += advance.fX; 353 y += advance.fY; 354 } 355 356 glyphStorage.setPosition(glyphCount, x, y, success); 357 } 358 359 void LayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, 360 LEGlyphStorage &glyphStorage, LEErrorCode &success) 361 { 362 if (LE_FAILURE(success)) { 363 return; 364 } 365 366 if (chars == NULL || offset < 0 || count < 0) { 367 success = LE_ILLEGAL_ARGUMENT_ERROR; 368 return; 369 } 370 371 LEReferenceTo<GlyphDefinitionTableHeader> gdefTable((GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable, 372 CanonShaping::glyphDefinitionTableLen); 373 CanonMarkFilter filter(gdefTable, success); 374 375 adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success); 376 377 if (fTypoFlags & LE_Kerning_FEATURE_FLAG) { /* kerning enabled */ 378 LETableReference kernTable(fFontInstance, LE_KERN_TABLE_TAG, success); 379 KernTable kt(kernTable, success); 380 kt.process(glyphStorage, success); 381 } 382 383 // default is no adjustments 384 return; 385 } 386 387 void LayoutEngine::adjustMarkGlyphs(LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success) 388 { 389 float xAdjust = 0; 390 le_int32 p, glyphCount = glyphStorage.getGlyphCount(); 391 392 if (LE_FAILURE(success)) { 393 return; 394 } 395 396 if (markFilter == NULL) { 397 success = LE_ILLEGAL_ARGUMENT_ERROR; 398 return; 399 } 400 401 float ignore, prev; 402 403 glyphStorage.getGlyphPosition(0, prev, ignore, success); 404 405 for (p = 0; p < glyphCount; p += 1) { 406 float next, xAdvance; 407 408 glyphStorage.getGlyphPosition(p + 1, next, ignore, success); 409 410 xAdvance = next - prev; 411 glyphStorage.adjustPosition(p, xAdjust, 0, success); 412 413 if (markFilter->accept(glyphStorage[p])) { 414 xAdjust -= xAdvance; 415 } 416 417 prev = next; 418 } 419 420 glyphStorage.adjustPosition(glyphCount, xAdjust, 0, success); 421 } 422 423 void LayoutEngine::adjustMarkGlyphs(const LEUnicode chars[], le_int32 charCount, le_bool reverse, LEGlyphStorage &glyphStorage, LEGlyphFilter *markFilter, LEErrorCode &success) 424 { 425 float xAdjust = 0; 426 le_int32 c = 0, direction = 1, p; 427 le_int32 glyphCount = glyphStorage.getGlyphCount(); 428 429 if (LE_FAILURE(success)) { 430 return; 431 } 432 433 if (markFilter == NULL) { 434 success = LE_ILLEGAL_ARGUMENT_ERROR; 435 return; 436 } 437 438 if (reverse) { 439 c = glyphCount - 1; 440 direction = -1; 441 } 442 443 float ignore, prev; 444 445 glyphStorage.getGlyphPosition(0, prev, ignore, success); 446 447 for (p = 0; p < charCount; p += 1, c += direction) { 448 float next, xAdvance; 449 450 glyphStorage.getGlyphPosition(p + 1, next, ignore, success); 451 452 xAdvance = next - prev; 453 glyphStorage.adjustPosition(p, xAdjust, 0, success); 454 455 if (markFilter->accept(chars[c])) { 456 xAdjust -= xAdvance; 457 } 458 459 prev = next; 460 } 461 462 glyphStorage.adjustPosition(glyphCount, xAdjust, 0, success); 463 } 464 465 const void *LayoutEngine::getFontTable(LETag tableTag, size_t &length) const 466 { 467 return fFontInstance->getFontTable(tableTag, length); 468 } 469 470 void LayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror, 471 LEGlyphStorage &glyphStorage, LEErrorCode &success) 472 { 473 if (LE_FAILURE(success)) { 474 return; 475 } 476 477 glyphStorage.allocateGlyphArray(count, reverse, success); 478 479 DefaultCharMapper charMapper(TRUE, mirror); 480 481 fFontInstance->mapCharsToGlyphs(chars, offset, count, reverse, &charMapper, fFilterZeroWidth, glyphStorage); 482 } 483 484 // Input: characters, font? 485 // Output: glyphs, positions, char indices 486 // Returns: number of glyphs 487 le_int32 LayoutEngine::layoutChars(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, 488 float x, float y, LEErrorCode &success) 489 { 490 if (LE_FAILURE(success)) { 491 return 0; 492 } 493 494 if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { 495 success = LE_ILLEGAL_ARGUMENT_ERROR; 496 return 0; 497 } 498 499 le_int32 glyphCount; 500 501 if (fGlyphStorage->getGlyphCount() > 0) { 502 fGlyphStorage->reset(); 503 } 504 505 glyphCount = computeGlyphs(chars, offset, count, max, rightToLeft, *fGlyphStorage, success); 506 positionGlyphs(*fGlyphStorage, x, y, success); 507 adjustGlyphPositions(chars, offset, count, rightToLeft, *fGlyphStorage, success); 508 509 return glyphCount; 510 } 511 512 void LayoutEngine::reset() 513 { 514 if(fGlyphStorage!=NULL) { 515 fGlyphStorage->reset(); 516 } 517 } 518 519 LayoutEngine *LayoutEngine::layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, LEErrorCode &success) 520 { 521 //kerning and ligatures - by default 522 return LayoutEngine::layoutEngineFactory(fontInstance, scriptCode, languageCode, LE_DEFAULT_FEATURE_FLAG, success); 523 } 524 525 LayoutEngine *LayoutEngine::layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success) 526 { 527 static const le_uint32 gsubTableTag = LE_GSUB_TABLE_TAG; 528 static const le_uint32 mortTableTag = LE_MORT_TABLE_TAG; 529 static const le_uint32 morxTableTag = LE_MORX_TABLE_TAG; 530 531 if (LE_FAILURE(success)) { 532 return NULL; 533 } 534 535 LEReferenceTo<GlyphSubstitutionTableHeader> gsubTable(fontInstance,gsubTableTag,success); 536 LayoutEngine *result = NULL; 537 LETag scriptTag = 0x00000000; 538 LETag languageTag = 0x00000000; 539 LETag v2ScriptTag = OpenTypeLayoutEngine::getV2ScriptTag(scriptCode); 540 541 // Right now, only invoke V2 processing for Devanagari. TODO: Allow more V2 scripts as they are 542 // properly tested. 543 544 if ( v2ScriptTag == dev2ScriptTag && gsubTable.isValid() && gsubTable->coversScript(gsubTable, v2ScriptTag, success )) { 545 result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, TRUE, gsubTable, success); 546 } 547 else if (gsubTable.isValid() && gsubTable->coversScript(gsubTable, scriptTag = OpenTypeLayoutEngine::getScriptTag(scriptCode), success)) { 548 switch (scriptCode) { 549 case bengScriptCode: 550 case devaScriptCode: 551 case gujrScriptCode: 552 case kndaScriptCode: 553 case mlymScriptCode: 554 case oryaScriptCode: 555 case guruScriptCode: 556 case tamlScriptCode: 557 case teluScriptCode: 558 case sinhScriptCode: 559 result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, FALSE, gsubTable, success); 560 break; 561 562 case arabScriptCode: 563 result = new ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 564 break; 565 566 case hebrScriptCode: 567 // Disable hebrew ligatures since they have only archaic uses, see ticket #8318 568 result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags & ~kTypoFlagLiga, gsubTable, success); 569 break; 570 571 case hangScriptCode: 572 result = new HangulOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 573 break; 574 575 case haniScriptCode: 576 languageTag = OpenTypeLayoutEngine::getLangSysTag(languageCode); 577 578 switch (languageCode) { 579 case korLanguageCode: 580 case janLanguageCode: 581 case zhtLanguageCode: 582 case zhsLanguageCode: 583 if (gsubTable->coversScriptAndLanguage(gsubTable, scriptTag, languageTag, success, TRUE)) { 584 result = new HanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 585 break; 586 } 587 588 // note: falling through to default case. 589 default: 590 result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 591 break; 592 } 593 594 break; 595 596 case tibtScriptCode: 597 result = new TibetanOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 598 break; 599 600 case khmrScriptCode: 601 result = new KhmerOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 602 break; 603 604 default: 605 result = new OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success); 606 break; 607 } 608 } else { 609 LEReferenceTo<MorphTableHeader2> morxTable(fontInstance, morxTableTag, success); 610 if (LE_SUCCESS(success) && morxTable.isValid() && SWAPL(morxTable->version)==0x00020000) { 611 result = new GXLayoutEngine2(fontInstance, scriptCode, languageCode, morxTable, typoFlags, success); 612 } else { 613 LEReferenceTo<MorphTableHeader> mortTable(fontInstance, mortTableTag, success); 614 if (LE_SUCCESS(success) && mortTable.isValid() && SWAPL(mortTable->version)==0x00010000) { // mort 615 result = new GXLayoutEngine(fontInstance, scriptCode, languageCode, mortTable, success); 616 } else { 617 switch (scriptCode) { 618 case bengScriptCode: 619 case devaScriptCode: 620 case gujrScriptCode: 621 case kndaScriptCode: 622 case mlymScriptCode: 623 case oryaScriptCode: 624 case guruScriptCode: 625 case tamlScriptCode: 626 case teluScriptCode: 627 case sinhScriptCode: 628 { 629 result = new IndicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success); 630 break; 631 } 632 633 case arabScriptCode: 634 //case hebrScriptCode: 635 result = new UnicodeArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success); 636 break; 637 638 //case hebrScriptCode: 639 // return new HebrewOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags); 640 641 case thaiScriptCode: 642 result = new ThaiLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success); 643 break; 644 645 case hangScriptCode: 646 result = new HangulOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success); 647 break; 648 649 default: 650 result = new LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success); 651 break; 652 } 653 } 654 } 655 } 656 657 if (result && LE_FAILURE(success)) { 658 delete result; 659 result = NULL; 660 } 661 662 if (result == NULL) { 663 success = LE_MEMORY_ALLOCATION_ERROR; 664 } 665 666 return result; 667 } 668 669 LayoutEngine::~LayoutEngine() { 670 delete fGlyphStorage; 671 } 672 673 U_NAMESPACE_END 674
