1 /* 2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg 3 * Copyright (C) 2006 Behdad Esfahbod 4 * 5 * This is part of HarfBuzz, an OpenType Layout engine 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 26 #ifndef HARFBUZZ_GPOS_PRIVATE_H 27 #define HARFBUZZ_GPOS_PRIVATE_H 28 29 #include "harfbuzz-impl.h" 30 #include "harfbuzz-stream-private.h" 31 #include "harfbuzz-gpos.h" 32 33 HB_BEGIN_HEADER 34 35 #ifdef HB_USE_PACKED_STRUCTS 36 #pragma pack(push, 1) 37 #endif 38 39 /* shared tables */ 40 41 #define VR_X_PLACEMENT_DEVICE 0 42 #define VR_Y_PLACEMENT_DEVICE 1 43 #define VR_X_ADVANCE_DEVICE 2 44 #define VR_Y_ADVANCE_DEVICE 3 45 46 struct HB_ValueRecord_ 47 { 48 HB_Short XPlacement; /* horizontal adjustment for 49 placement */ 50 HB_Short YPlacement; /* vertical adjustment for 51 placement */ 52 HB_Short XAdvance; /* horizontal adjustment for 53 advance */ 54 HB_Short YAdvance; /* vertical adjustment for 55 advance */ 56 57 HB_Device** DeviceTables; /* device tables for placement 58 and advance */ 59 60 #ifdef HB_SUPPORT_MULTIPLE_MASTER 61 HB_UShort XIdPlacement; /* horizontal placement metric ID */ 62 HB_UShort YIdPlacement; /* vertical placement metric ID */ 63 HB_UShort XIdAdvance; /* horizontal advance metric ID */ 64 HB_UShort YIdAdvance; /* vertical advance metric ID */ 65 #endif 66 }; 67 68 typedef struct HB_ValueRecord_ HB_ValueRecord; 69 70 71 /* Mask values to scan the value format of the ValueRecord structure. 72 We always expand compressed ValueRecords of the font. */ 73 74 #define HB_GPOS_FORMAT_HAVE_DEVICE_TABLES 0x00F0 75 76 #define HB_GPOS_FORMAT_HAVE_X_PLACEMENT 0x0001 77 #define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT 0x0002 78 #define HB_GPOS_FORMAT_HAVE_X_ADVANCE 0x0004 79 #define HB_GPOS_FORMAT_HAVE_Y_ADVANCE 0x0008 80 #define HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE 0x0010 81 #define HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE 0x0020 82 #define HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE 0x0040 83 #define HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE 0x0080 84 #define HB_GPOS_FORMAT_HAVE_X_ID_PLACEMENT 0x0100 85 #define HB_GPOS_FORMAT_HAVE_Y_ID_PLACEMENT 0x0200 86 #define HB_GPOS_FORMAT_HAVE_X_ID_ADVANCE 0x0400 87 #define HB_GPOS_FORMAT_HAVE_Y_ID_ADVANCE 0x0800 88 89 90 struct HB_AnchorFormat1_ 91 { 92 HB_Short XCoordinate; /* horizontal value */ 93 HB_Short YCoordinate; /* vertical value */ 94 }; 95 96 typedef struct HB_AnchorFormat1_ HB_AnchorFormat1; 97 98 99 struct HB_AnchorFormat2_ 100 { 101 HB_Short XCoordinate; /* horizontal value */ 102 HB_Short YCoordinate; /* vertical value */ 103 HB_UShort AnchorPoint; /* index to glyph contour point */ 104 }; 105 106 typedef struct HB_AnchorFormat2_ HB_AnchorFormat2; 107 108 #define AF3_X_DEVICE_TABLE 0 109 #define AF3_Y_DEVICE_TABLE 1 110 111 struct HB_AnchorFormat3_ 112 { 113 HB_Short XCoordinate; /* horizontal value */ 114 HB_Short YCoordinate; /* vertical value */ 115 HB_Device** DeviceTables; /* device tables for coordinates */ 116 }; 117 118 typedef struct HB_AnchorFormat3_ HB_AnchorFormat3; 119 120 121 #ifdef HB_SUPPORT_MULTIPLE_MASTER 122 struct HB_AnchorFormat4_ 123 { 124 HB_UShort XIdAnchor; /* horizontal metric ID */ 125 HB_UShort YIdAnchor; /* vertical metric ID */ 126 }; 127 128 typedef struct HB_AnchorFormat4_ HB_AnchorFormat4; 129 #endif 130 131 132 struct HB_Anchor_ 133 { 134 HB_Byte PosFormat; /* 1, 2, 3, or 4 -- 0 indicates 135 that there is no Anchor table */ 136 137 union 138 { 139 HB_AnchorFormat1 af1; 140 HB_AnchorFormat2 af2; 141 HB_AnchorFormat3 af3; 142 #ifdef HB_SUPPORT_MULTIPLE_MASTER 143 HB_AnchorFormat4 af4; 144 #endif 145 } af; 146 }; 147 148 typedef struct HB_Anchor_ HB_Anchor; 149 150 151 struct HB_MarkRecord_ 152 { 153 HB_UShort Class; /* mark class */ 154 HB_Anchor MarkAnchor; /* anchor table */ 155 }; 156 157 typedef struct HB_MarkRecord_ HB_MarkRecord; 158 159 160 struct HB_MarkArray_ 161 { 162 HB_UShort MarkCount; /* number of MarkRecord tables */ 163 HB_MarkRecord* MarkRecord; /* array of MarkRecord tables */ 164 }; 165 166 typedef struct HB_MarkArray_ HB_MarkArray; 167 168 169 /* LookupType 1 */ 170 171 struct HB_SinglePosFormat1_ 172 { 173 HB_ValueRecord Value; /* ValueRecord for all covered 174 glyphs */ 175 }; 176 177 typedef struct HB_SinglePosFormat1_ HB_SinglePosFormat1; 178 179 180 struct HB_SinglePosFormat2_ 181 { 182 HB_UShort ValueCount; /* number of ValueRecord tables */ 183 HB_ValueRecord* Value; /* array of ValueRecord tables */ 184 }; 185 186 typedef struct HB_SinglePosFormat2_ HB_SinglePosFormat2; 187 188 189 struct HB_SinglePos_ 190 { 191 HB_Byte PosFormat; /* 1 or 2 */ 192 HB_Coverage Coverage; /* Coverage table */ 193 194 HB_UShort ValueFormat; /* format of ValueRecord table */ 195 196 union 197 { 198 HB_SinglePosFormat1 spf1; 199 HB_SinglePosFormat2 spf2; 200 } spf; 201 }; 202 203 typedef struct HB_SinglePos_ HB_SinglePos; 204 205 206 /* LookupType 2 */ 207 208 struct HB_PairValueRecord_ 209 { 210 HB_UShort SecondGlyph; /* glyph ID for second glyph */ 211 HB_ValueRecord Value1; /* pos. data for first glyph */ 212 HB_ValueRecord Value2; /* pos. data for second glyph */ 213 }; 214 215 typedef struct HB_PairValueRecord_ HB_PairValueRecord; 216 217 218 struct HB_PairSet_ 219 { 220 HB_UShort PairValueCount; 221 /* number of PairValueRecord tables */ 222 HB_PairValueRecord* PairValueRecord; 223 /* array of PairValueRecord tables */ 224 }; 225 226 typedef struct HB_PairSet_ HB_PairSet; 227 228 229 struct HB_PairPosFormat1_ 230 { 231 HB_UShort PairSetCount; /* number of PairSet tables */ 232 HB_PairSet* PairSet; /* array of PairSet tables */ 233 }; 234 235 typedef struct HB_PairPosFormat1_ HB_PairPosFormat1; 236 237 238 struct HB_Class2Record_ 239 { 240 HB_ValueRecord Value1; /* pos. data for first glyph */ 241 HB_ValueRecord Value2; /* pos. data for second glyph */ 242 }; 243 244 typedef struct HB_Class2Record_ HB_Class2Record; 245 246 247 struct HB_Class1Record_ 248 { 249 HB_Class2Record* Class2Record; /* array of Class2Record tables */ 250 }; 251 252 typedef struct HB_Class1Record_ HB_Class1Record; 253 254 255 struct HB_PairPosFormat2_ 256 { 257 HB_ClassDefinition ClassDef1; /* class def. for first glyph */ 258 HB_ClassDefinition ClassDef2; /* class def. for second glyph */ 259 HB_UShort Class1Count; /* number of classes in ClassDef1 260 table */ 261 HB_UShort Class2Count; /* number of classes in ClassDef2 262 table */ 263 HB_Class1Record* Class1Record; /* array of Class1Record tables */ 264 }; 265 266 typedef struct HB_PairPosFormat2_ HB_PairPosFormat2; 267 268 269 struct HB_PairPos_ 270 { 271 HB_Byte PosFormat; /* 1 or 2 */ 272 HB_Coverage Coverage; /* Coverage table */ 273 HB_UShort ValueFormat1; /* format of ValueRecord table 274 for first glyph */ 275 HB_UShort ValueFormat2; /* format of ValueRecord table 276 for second glyph */ 277 278 union 279 { 280 HB_PairPosFormat1 ppf1; 281 HB_PairPosFormat2 ppf2; 282 } ppf; 283 }; 284 285 typedef struct HB_PairPos_ HB_PairPos; 286 287 288 /* LookupType 3 */ 289 290 struct HB_EntryExitRecord_ 291 { 292 HB_Anchor EntryAnchor; /* entry Anchor table */ 293 HB_Anchor ExitAnchor; /* exit Anchor table */ 294 }; 295 296 297 typedef struct HB_EntryExitRecord_ HB_EntryExitRecord; 298 299 struct HB_CursivePos_ 300 { 301 HB_UShort PosFormat; /* always 1 */ 302 HB_Coverage Coverage; /* Coverage table */ 303 HB_UShort EntryExitCount; 304 /* number of EntryExitRecord tables */ 305 HB_EntryExitRecord* EntryExitRecord; 306 /* array of EntryExitRecord tables */ 307 }; 308 309 typedef struct HB_CursivePos_ HB_CursivePos; 310 311 312 /* LookupType 4 */ 313 314 struct HB_BaseRecord_ 315 { 316 HB_Anchor* BaseAnchor; /* array of base glyph anchor 317 tables */ 318 }; 319 320 typedef struct HB_BaseRecord_ HB_BaseRecord; 321 322 323 struct HB_BaseArray_ 324 { 325 HB_UShort BaseCount; /* number of BaseRecord tables */ 326 HB_BaseRecord* BaseRecord; /* array of BaseRecord tables */ 327 }; 328 329 typedef struct HB_BaseArray_ HB_BaseArray; 330 331 332 struct HB_MarkBasePos_ 333 { 334 HB_UShort PosFormat; /* always 1 */ 335 HB_Coverage MarkCoverage; /* mark glyph coverage table */ 336 HB_Coverage BaseCoverage; /* base glyph coverage table */ 337 HB_UShort ClassCount; /* number of mark classes */ 338 HB_MarkArray MarkArray; /* mark array table */ 339 HB_BaseArray BaseArray; /* base array table */ 340 }; 341 342 typedef struct HB_MarkBasePos_ HB_MarkBasePos; 343 344 345 /* LookupType 5 */ 346 347 struct HB_ComponentRecord_ 348 { 349 HB_Anchor* LigatureAnchor; /* array of ligature glyph anchor 350 tables */ 351 }; 352 353 typedef struct HB_ComponentRecord_ HB_ComponentRecord; 354 355 356 struct HB_LigatureAttach_ 357 { 358 HB_UShort ComponentCount; 359 /* number of ComponentRecord tables */ 360 HB_ComponentRecord* ComponentRecord; 361 /* array of ComponentRecord tables */ 362 }; 363 364 typedef struct HB_LigatureAttach_ HB_LigatureAttach; 365 366 367 struct HB_LigatureArray_ 368 { 369 HB_UShort LigatureCount; /* number of LigatureAttach tables */ 370 HB_LigatureAttach* LigatureAttach; 371 /* array of LigatureAttach tables */ 372 }; 373 374 typedef struct HB_LigatureArray_ HB_LigatureArray; 375 376 377 struct HB_MarkLigPos_ 378 { 379 HB_UShort PosFormat; /* always 1 */ 380 HB_Coverage MarkCoverage; /* mark glyph coverage table */ 381 HB_Coverage LigatureCoverage; 382 /* ligature glyph coverage table */ 383 HB_UShort ClassCount; /* number of mark classes */ 384 HB_MarkArray MarkArray; /* mark array table */ 385 HB_LigatureArray LigatureArray; /* ligature array table */ 386 }; 387 388 typedef struct HB_MarkLigPos_ HB_MarkLigPos; 389 390 391 /* LookupType 6 */ 392 393 struct HB_Mark2Record_ 394 { 395 HB_Anchor* Mark2Anchor; /* array of mark glyph anchor 396 tables */ 397 }; 398 399 typedef struct HB_Mark2Record_ HB_Mark2Record; 400 401 402 struct HB_Mark2Array_ 403 { 404 HB_UShort Mark2Count; /* number of Mark2Record tables */ 405 HB_Mark2Record* Mark2Record; /* array of Mark2Record tables */ 406 }; 407 408 typedef struct HB_Mark2Array_ HB_Mark2Array; 409 410 411 struct HB_MarkMarkPos_ 412 { 413 HB_UShort PosFormat; /* always 1 */ 414 HB_Coverage Mark1Coverage; /* first mark glyph coverage table */ 415 HB_Coverage Mark2Coverage; /* second mark glyph coverave table */ 416 HB_UShort ClassCount; /* number of combining mark classes */ 417 HB_MarkArray Mark1Array; /* MarkArray table for first mark */ 418 HB_Mark2Array Mark2Array; /* MarkArray table for second mark */ 419 }; 420 421 typedef struct HB_MarkMarkPos_ HB_MarkMarkPos; 422 423 424 /* needed by both lookup type 7 and 8 */ 425 426 struct HB_PosLookupRecord_ 427 { 428 HB_UShort SequenceIndex; /* index into current 429 glyph sequence */ 430 HB_UShort LookupListIndex; /* Lookup to apply to that pos. */ 431 }; 432 433 typedef struct HB_PosLookupRecord_ HB_PosLookupRecord; 434 435 436 /* LookupType 7 */ 437 438 struct HB_PosRule_ 439 { 440 HB_UShort GlyphCount; /* total number of input glyphs */ 441 HB_UShort PosCount; /* number of PosLookupRecord tables */ 442 HB_UShort* Input; /* array of input glyph IDs */ 443 HB_PosLookupRecord* PosLookupRecord; 444 /* array of PosLookupRecord tables */ 445 }; 446 447 typedef struct HB_PosRule_ HB_PosRule; 448 449 450 struct HB_PosRuleSet_ 451 { 452 HB_UShort PosRuleCount; /* number of PosRule tables */ 453 HB_PosRule* PosRule; /* array of PosRule tables */ 454 }; 455 456 typedef struct HB_PosRuleSet_ HB_PosRuleSet; 457 458 459 struct HB_ContextPosFormat1_ 460 { 461 HB_Coverage Coverage; /* Coverage table */ 462 HB_UShort PosRuleSetCount; /* number of PosRuleSet tables */ 463 HB_PosRuleSet* PosRuleSet; /* array of PosRuleSet tables */ 464 }; 465 466 typedef struct HB_ContextPosFormat1_ HB_ContextPosFormat1; 467 468 469 struct HB_PosClassRule_ 470 { 471 HB_UShort GlyphCount; /* total number of context classes */ 472 HB_UShort PosCount; /* number of PosLookupRecord tables */ 473 HB_UShort* Class; /* array of classes */ 474 HB_PosLookupRecord* PosLookupRecord; 475 /* array of PosLookupRecord tables */ 476 }; 477 478 typedef struct HB_PosClassRule_ HB_PosClassRule; 479 480 481 struct HB_PosClassSet_ 482 { 483 HB_UShort PosClassRuleCount; 484 /* number of PosClassRule tables */ 485 HB_PosClassRule* PosClassRule; /* array of PosClassRule tables */ 486 }; 487 488 typedef struct HB_PosClassSet_ HB_PosClassSet; 489 490 491 /* The `MaxContextLength' field is not defined in the TTO specification 492 but simplifies the implementation of this format. It holds the 493 maximal context length used in the context rules. */ 494 495 struct HB_ContextPosFormat2_ 496 { 497 HB_UShort MaxContextLength; 498 /* maximal context length */ 499 HB_Coverage Coverage; /* Coverage table */ 500 HB_ClassDefinition ClassDef; /* ClassDef table */ 501 HB_UShort PosClassSetCount; 502 /* number of PosClassSet tables */ 503 HB_PosClassSet* PosClassSet; /* array of PosClassSet tables */ 504 }; 505 506 typedef struct HB_ContextPosFormat2_ HB_ContextPosFormat2; 507 508 509 struct HB_ContextPosFormat3_ 510 { 511 HB_UShort GlyphCount; /* number of input glyphs */ 512 HB_UShort PosCount; /* number of PosLookupRecord tables */ 513 HB_Coverage* Coverage; /* array of Coverage tables */ 514 HB_PosLookupRecord* PosLookupRecord; 515 /* array of PosLookupRecord tables */ 516 }; 517 518 typedef struct HB_ContextPosFormat3_ HB_ContextPosFormat3; 519 520 521 struct HB_ContextPos_ 522 { 523 HB_Byte PosFormat; /* 1, 2, or 3 */ 524 525 union 526 { 527 HB_ContextPosFormat1 cpf1; 528 HB_ContextPosFormat2 cpf2; 529 HB_ContextPosFormat3 cpf3; 530 } cpf; 531 }; 532 533 typedef struct HB_ContextPos_ HB_ContextPos; 534 535 536 /* LookupType 8 */ 537 538 struct HB_ChainPosRule_ 539 { 540 HB_UShort* Backtrack; /* array of backtrack glyph IDs */ 541 HB_UShort* Input; /* array of input glyph IDs */ 542 HB_UShort* Lookahead; /* array of lookahead glyph IDs */ 543 HB_PosLookupRecord* PosLookupRecord; 544 /* array of PosLookupRecords */ 545 HB_UShort BacktrackGlyphCount; 546 /* total number of backtrack glyphs */ 547 HB_UShort InputGlyphCount; 548 /* total number of input glyphs */ 549 HB_UShort LookaheadGlyphCount; 550 /* total number of lookahead glyphs */ 551 HB_UShort PosCount; /* number of PosLookupRecords */ 552 }; 553 554 typedef struct HB_ChainPosRule_ HB_ChainPosRule; 555 556 557 struct HB_ChainPosRuleSet_ 558 { 559 HB_UShort ChainPosRuleCount; 560 /* number of ChainPosRule tables */ 561 HB_ChainPosRule* ChainPosRule; /* array of ChainPosRule tables */ 562 }; 563 564 typedef struct HB_ChainPosRuleSet_ HB_ChainPosRuleSet; 565 566 567 struct HB_ChainContextPosFormat1_ 568 { 569 HB_Coverage Coverage; /* Coverage table */ 570 HB_UShort ChainPosRuleSetCount; 571 /* number of ChainPosRuleSet tables */ 572 HB_ChainPosRuleSet* ChainPosRuleSet; 573 /* array of ChainPosRuleSet tables */ 574 }; 575 576 typedef struct HB_ChainContextPosFormat1_ HB_ChainContextPosFormat1; 577 578 579 struct HB_ChainPosClassRule_ 580 { 581 HB_UShort* Backtrack; /* array of backtrack classes */ 582 HB_UShort* Input; /* array of context classes */ 583 HB_UShort* Lookahead; /* array of lookahead classes */ 584 HB_PosLookupRecord* PosLookupRecord; 585 /* array of substitution lookups */ 586 HB_UShort BacktrackGlyphCount; 587 /* total number of backtrack 588 classes */ 589 HB_UShort InputGlyphCount; 590 /* total number of context classes */ 591 HB_UShort LookaheadGlyphCount; 592 /* total number of lookahead 593 classes */ 594 HB_UShort PosCount; /* number of PosLookupRecords */ 595 }; 596 597 typedef struct HB_ChainPosClassRule_ HB_ChainPosClassRule; 598 599 600 struct HB_ChainPosClassSet_ 601 { 602 HB_UShort ChainPosClassRuleCount; 603 /* number of ChainPosClassRule 604 tables */ 605 HB_ChainPosClassRule* ChainPosClassRule; 606 /* array of ChainPosClassRule 607 tables */ 608 }; 609 610 typedef struct HB_ChainPosClassSet_ HB_ChainPosClassSet; 611 612 613 /* The `MaxXXXLength' fields are not defined in the TTO specification 614 but simplifies the implementation of this format. It holds the 615 maximal context length used in the specific context rules. */ 616 617 struct HB_ChainContextPosFormat2_ 618 { 619 HB_Coverage Coverage; /* Coverage table */ 620 621 HB_UShort MaxBacktrackLength; 622 /* maximal backtrack length */ 623 HB_ClassDefinition BacktrackClassDef; 624 /* BacktrackClassDef table */ 625 HB_UShort MaxInputLength; 626 /* maximal input length */ 627 HB_ClassDefinition InputClassDef; 628 /* InputClassDef table */ 629 HB_UShort MaxLookaheadLength; 630 /* maximal lookahead length */ 631 HB_ClassDefinition LookaheadClassDef; 632 /* LookaheadClassDef table */ 633 634 HB_UShort ChainPosClassSetCount; 635 /* number of ChainPosClassSet 636 tables */ 637 HB_ChainPosClassSet* ChainPosClassSet; 638 /* array of ChainPosClassSet 639 tables */ 640 }; 641 642 typedef struct HB_ChainContextPosFormat2_ HB_ChainContextPosFormat2; 643 644 645 struct HB_ChainContextPosFormat3_ 646 { 647 HB_UShort BacktrackGlyphCount; 648 /* number of backtrack glyphs */ 649 HB_Coverage* BacktrackCoverage; 650 /* array of backtrack Coverage 651 tables */ 652 HB_UShort InputGlyphCount; 653 /* number of input glyphs */ 654 HB_Coverage* InputCoverage; 655 /* array of input coverage 656 tables */ 657 HB_UShort LookaheadGlyphCount; 658 /* number of lookahead glyphs */ 659 HB_Coverage* LookaheadCoverage; 660 /* array of lookahead coverage 661 tables */ 662 HB_UShort PosCount; /* number of PosLookupRecords */ 663 HB_PosLookupRecord* PosLookupRecord; 664 /* array of substitution lookups */ 665 }; 666 667 typedef struct HB_ChainContextPosFormat3_ HB_ChainContextPosFormat3; 668 669 670 struct HB_ChainContextPos_ 671 { 672 HB_Byte PosFormat; /* 1, 2, or 3 */ 673 674 union 675 { 676 HB_ChainContextPosFormat1 ccpf1; 677 HB_ChainContextPosFormat2 ccpf2; 678 HB_ChainContextPosFormat3 ccpf3; 679 } ccpf; 680 }; 681 682 typedef struct HB_ChainContextPos_ HB_ChainContextPos; 683 684 685 #if 0 686 /* LookupType 10 */ 687 struct HB_ExtensionPos_ 688 { 689 HB_UShort PosFormat; /* always 1 */ 690 HB_UShort LookuptType; /* lookup-type of referenced subtable */ 691 HB_GPOS_SubTable *subtable; /* referenced subtable */ 692 }; 693 694 typedef struct HB_ExtensionPos_ HB_ExtensionPos; 695 #endif 696 697 698 union HB_GPOS_SubTable_ 699 { 700 HB_SinglePos single; 701 HB_PairPos pair; 702 HB_CursivePos cursive; 703 HB_MarkBasePos markbase; 704 HB_MarkLigPos marklig; 705 HB_MarkMarkPos markmark; 706 HB_ContextPos context; 707 HB_ChainContextPos chain; 708 }; 709 710 typedef union HB_GPOS_SubTable_ HB_GPOS_SubTable; 711 712 713 714 HB_INTERNAL HB_Error 715 _HB_GPOS_Load_SubTable( HB_GPOS_SubTable* st, 716 HB_Stream stream, 717 HB_UShort lookup_type ); 718 719 HB_INTERNAL void 720 _HB_GPOS_Free_SubTable( HB_GPOS_SubTable* st, 721 HB_UShort lookup_type ); 722 723 #ifdef HB_USE_PACKED_STRUCTS 724 #pragma pack(pop) 725 #endif 726 727 HB_END_HEADER 728 729 #endif /* HARFBUZZ_GPOS_PRIVATE_H */ 730