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 /* shared tables */ 36 37 #define VR_X_PLACEMENT_DEVICE 0 38 #define VR_Y_PLACEMENT_DEVICE 1 39 #define VR_X_ADVANCE_DEVICE 2 40 #define VR_Y_ADVANCE_DEVICE 3 41 42 #ifndef HB_SUPPORT_MULTIPLE_MASTER 43 # define HB_USE_FLEXIBLE_VALUE_RECORD 44 #endif 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 #ifndef HB_USE_FLEXIBLE_VALUE_RECORD 223 HB_PairValueRecord* PairValueRecord; 224 /* array of PairValueRecord tables */ 225 #else 226 HB_Short* ValueRecords; 227 #endif 228 }; 229 230 typedef struct HB_PairSet_ HB_PairSet; 231 232 233 struct HB_PairPosFormat1_ 234 { 235 HB_UShort PairSetCount; /* number of PairSet tables */ 236 HB_PairSet* PairSet; /* array of PairSet tables */ 237 }; 238 239 typedef struct HB_PairPosFormat1_ HB_PairPosFormat1; 240 241 242 struct HB_Class2Record_ 243 { 244 HB_ValueRecord Value1; /* pos. data for first glyph */ 245 HB_ValueRecord Value2; /* pos. data for second glyph */ 246 }; 247 248 typedef struct HB_Class2Record_ HB_Class2Record; 249 250 251 struct HB_Class1Record_ 252 { 253 hb_uint8 IsFlexible; 254 union { 255 HB_Class2Record* Class2Record; /* array of Class2Record tables */ 256 HB_Short* ValueRecords; 257 } c2r; 258 }; 259 260 typedef struct HB_Class1Record_ HB_Class1Record; 261 262 263 struct HB_PairPosFormat2_ 264 { 265 HB_ClassDefinition ClassDef1; /* class def. for first glyph */ 266 HB_ClassDefinition ClassDef2; /* class def. for second glyph */ 267 HB_UShort Class1Count; /* number of classes in ClassDef1 268 table */ 269 HB_UShort Class2Count; /* number of classes in ClassDef2 270 table */ 271 HB_Class1Record* Class1Record; /* array of Class1Record tables */ 272 }; 273 274 typedef struct HB_PairPosFormat2_ HB_PairPosFormat2; 275 276 277 struct HB_PairPos_ 278 { 279 HB_Byte PosFormat; /* 1 or 2 */ 280 HB_Coverage Coverage; /* Coverage table */ 281 HB_UShort ValueFormat1; /* format of ValueRecord table 282 for first glyph */ 283 HB_UShort ValueFormat2; /* format of ValueRecord table 284 for second glyph */ 285 286 union 287 { 288 HB_PairPosFormat1 ppf1; 289 HB_PairPosFormat2 ppf2; 290 } ppf; 291 }; 292 293 typedef struct HB_PairPos_ HB_PairPos; 294 295 296 /* LookupType 3 */ 297 298 struct HB_EntryExitRecord_ 299 { 300 HB_Anchor EntryAnchor; /* entry Anchor table */ 301 HB_Anchor ExitAnchor; /* exit Anchor table */ 302 }; 303 304 305 typedef struct HB_EntryExitRecord_ HB_EntryExitRecord; 306 307 struct HB_CursivePos_ 308 { 309 HB_UShort PosFormat; /* always 1 */ 310 HB_Coverage Coverage; /* Coverage table */ 311 HB_UShort EntryExitCount; 312 /* number of EntryExitRecord tables */ 313 HB_EntryExitRecord* EntryExitRecord; 314 /* array of EntryExitRecord tables */ 315 }; 316 317 typedef struct HB_CursivePos_ HB_CursivePos; 318 319 320 /* LookupType 4 */ 321 322 struct HB_BaseRecord_ 323 { 324 HB_Anchor* BaseAnchor; /* array of base glyph anchor 325 tables */ 326 }; 327 328 typedef struct HB_BaseRecord_ HB_BaseRecord; 329 330 331 struct HB_BaseArray_ 332 { 333 HB_UShort BaseCount; /* number of BaseRecord tables */ 334 HB_BaseRecord* BaseRecord; /* array of BaseRecord tables */ 335 }; 336 337 typedef struct HB_BaseArray_ HB_BaseArray; 338 339 340 struct HB_MarkBasePos_ 341 { 342 HB_UShort PosFormat; /* always 1 */ 343 HB_Coverage MarkCoverage; /* mark glyph coverage table */ 344 HB_Coverage BaseCoverage; /* base glyph coverage table */ 345 HB_UShort ClassCount; /* number of mark classes */ 346 HB_MarkArray MarkArray; /* mark array table */ 347 HB_BaseArray BaseArray; /* base array table */ 348 }; 349 350 typedef struct HB_MarkBasePos_ HB_MarkBasePos; 351 352 353 /* LookupType 5 */ 354 355 struct HB_ComponentRecord_ 356 { 357 HB_Anchor* LigatureAnchor; /* array of ligature glyph anchor 358 tables */ 359 }; 360 361 typedef struct HB_ComponentRecord_ HB_ComponentRecord; 362 363 364 struct HB_LigatureAttach_ 365 { 366 HB_UShort ComponentCount; 367 /* number of ComponentRecord tables */ 368 HB_ComponentRecord* ComponentRecord; 369 /* array of ComponentRecord tables */ 370 }; 371 372 typedef struct HB_LigatureAttach_ HB_LigatureAttach; 373 374 375 struct HB_LigatureArray_ 376 { 377 HB_UShort LigatureCount; /* number of LigatureAttach tables */ 378 HB_LigatureAttach* LigatureAttach; 379 /* array of LigatureAttach tables */ 380 }; 381 382 typedef struct HB_LigatureArray_ HB_LigatureArray; 383 384 385 struct HB_MarkLigPos_ 386 { 387 HB_UShort PosFormat; /* always 1 */ 388 HB_Coverage MarkCoverage; /* mark glyph coverage table */ 389 HB_Coverage LigatureCoverage; 390 /* ligature glyph coverage table */ 391 HB_UShort ClassCount; /* number of mark classes */ 392 HB_MarkArray MarkArray; /* mark array table */ 393 HB_LigatureArray LigatureArray; /* ligature array table */ 394 }; 395 396 typedef struct HB_MarkLigPos_ HB_MarkLigPos; 397 398 399 /* LookupType 6 */ 400 401 struct HB_Mark2Record_ 402 { 403 HB_Anchor* Mark2Anchor; /* array of mark glyph anchor 404 tables */ 405 }; 406 407 typedef struct HB_Mark2Record_ HB_Mark2Record; 408 409 410 struct HB_Mark2Array_ 411 { 412 HB_UShort Mark2Count; /* number of Mark2Record tables */ 413 HB_Mark2Record* Mark2Record; /* array of Mark2Record tables */ 414 }; 415 416 typedef struct HB_Mark2Array_ HB_Mark2Array; 417 418 419 struct HB_MarkMarkPos_ 420 { 421 HB_UShort PosFormat; /* always 1 */ 422 HB_Coverage Mark1Coverage; /* first mark glyph coverage table */ 423 HB_Coverage Mark2Coverage; /* second mark glyph coverave table */ 424 HB_UShort ClassCount; /* number of combining mark classes */ 425 HB_MarkArray Mark1Array; /* MarkArray table for first mark */ 426 HB_Mark2Array Mark2Array; /* MarkArray table for second mark */ 427 }; 428 429 typedef struct HB_MarkMarkPos_ HB_MarkMarkPos; 430 431 432 /* needed by both lookup type 7 and 8 */ 433 434 struct HB_PosLookupRecord_ 435 { 436 HB_UShort SequenceIndex; /* index into current 437 glyph sequence */ 438 HB_UShort LookupListIndex; /* Lookup to apply to that pos. */ 439 }; 440 441 typedef struct HB_PosLookupRecord_ HB_PosLookupRecord; 442 443 444 /* LookupType 7 */ 445 446 struct HB_PosRule_ 447 { 448 HB_UShort GlyphCount; /* total number of input glyphs */ 449 HB_UShort PosCount; /* number of PosLookupRecord tables */ 450 HB_UShort* Input; /* array of input glyph IDs */ 451 HB_PosLookupRecord* PosLookupRecord; 452 /* array of PosLookupRecord tables */ 453 }; 454 455 typedef struct HB_PosRule_ HB_PosRule; 456 457 458 struct HB_PosRuleSet_ 459 { 460 HB_UShort PosRuleCount; /* number of PosRule tables */ 461 HB_PosRule* PosRule; /* array of PosRule tables */ 462 }; 463 464 typedef struct HB_PosRuleSet_ HB_PosRuleSet; 465 466 467 struct HB_ContextPosFormat1_ 468 { 469 HB_Coverage Coverage; /* Coverage table */ 470 HB_UShort PosRuleSetCount; /* number of PosRuleSet tables */ 471 HB_PosRuleSet* PosRuleSet; /* array of PosRuleSet tables */ 472 }; 473 474 typedef struct HB_ContextPosFormat1_ HB_ContextPosFormat1; 475 476 477 struct HB_PosClassRule_ 478 { 479 HB_UShort GlyphCount; /* total number of context classes */ 480 HB_UShort PosCount; /* number of PosLookupRecord tables */ 481 HB_UShort* Class; /* array of classes */ 482 HB_PosLookupRecord* PosLookupRecord; 483 /* array of PosLookupRecord tables */ 484 }; 485 486 typedef struct HB_PosClassRule_ HB_PosClassRule; 487 488 489 struct HB_PosClassSet_ 490 { 491 HB_UShort PosClassRuleCount; 492 /* number of PosClassRule tables */ 493 HB_PosClassRule* PosClassRule; /* array of PosClassRule tables */ 494 }; 495 496 typedef struct HB_PosClassSet_ HB_PosClassSet; 497 498 499 /* The `MaxContextLength' field is not defined in the TTO specification 500 but simplifies the implementation of this format. It holds the 501 maximal context length used in the context rules. */ 502 503 struct HB_ContextPosFormat2_ 504 { 505 HB_UShort MaxContextLength; 506 /* maximal context length */ 507 HB_Coverage Coverage; /* Coverage table */ 508 HB_ClassDefinition ClassDef; /* ClassDef table */ 509 HB_UShort PosClassSetCount; 510 /* number of PosClassSet tables */ 511 HB_PosClassSet* PosClassSet; /* array of PosClassSet tables */ 512 }; 513 514 typedef struct HB_ContextPosFormat2_ HB_ContextPosFormat2; 515 516 517 struct HB_ContextPosFormat3_ 518 { 519 HB_UShort GlyphCount; /* number of input glyphs */ 520 HB_UShort PosCount; /* number of PosLookupRecord tables */ 521 HB_Coverage* Coverage; /* array of Coverage tables */ 522 HB_PosLookupRecord* PosLookupRecord; 523 /* array of PosLookupRecord tables */ 524 }; 525 526 typedef struct HB_ContextPosFormat3_ HB_ContextPosFormat3; 527 528 529 struct HB_ContextPos_ 530 { 531 HB_Byte PosFormat; /* 1, 2, or 3 */ 532 533 union 534 { 535 HB_ContextPosFormat1 cpf1; 536 HB_ContextPosFormat2 cpf2; 537 HB_ContextPosFormat3 cpf3; 538 } cpf; 539 }; 540 541 typedef struct HB_ContextPos_ HB_ContextPos; 542 543 544 /* LookupType 8 */ 545 546 struct HB_ChainPosRule_ 547 { 548 HB_UShort* Backtrack; /* array of backtrack glyph IDs */ 549 HB_UShort* Input; /* array of input glyph IDs */ 550 HB_UShort* Lookahead; /* array of lookahead glyph IDs */ 551 HB_PosLookupRecord* PosLookupRecord; 552 /* array of PosLookupRecords */ 553 HB_UShort BacktrackGlyphCount; 554 /* total number of backtrack glyphs */ 555 HB_UShort InputGlyphCount; 556 /* total number of input glyphs */ 557 HB_UShort LookaheadGlyphCount; 558 /* total number of lookahead glyphs */ 559 HB_UShort PosCount; /* number of PosLookupRecords */ 560 }; 561 562 typedef struct HB_ChainPosRule_ HB_ChainPosRule; 563 564 565 struct HB_ChainPosRuleSet_ 566 { 567 HB_UShort ChainPosRuleCount; 568 /* number of ChainPosRule tables */ 569 HB_ChainPosRule* ChainPosRule; /* array of ChainPosRule tables */ 570 }; 571 572 typedef struct HB_ChainPosRuleSet_ HB_ChainPosRuleSet; 573 574 575 struct HB_ChainContextPosFormat1_ 576 { 577 HB_Coverage Coverage; /* Coverage table */ 578 HB_UShort ChainPosRuleSetCount; 579 /* number of ChainPosRuleSet tables */ 580 HB_ChainPosRuleSet* ChainPosRuleSet; 581 /* array of ChainPosRuleSet tables */ 582 }; 583 584 typedef struct HB_ChainContextPosFormat1_ HB_ChainContextPosFormat1; 585 586 587 struct HB_ChainPosClassRule_ 588 { 589 HB_UShort* Backtrack; /* array of backtrack classes */ 590 HB_UShort* Input; /* array of context classes */ 591 HB_UShort* Lookahead; /* array of lookahead classes */ 592 HB_PosLookupRecord* PosLookupRecord; 593 /* array of substitution lookups */ 594 HB_UShort BacktrackGlyphCount; 595 /* total number of backtrack 596 classes */ 597 HB_UShort InputGlyphCount; 598 /* total number of context classes */ 599 HB_UShort LookaheadGlyphCount; 600 /* total number of lookahead 601 classes */ 602 HB_UShort PosCount; /* number of PosLookupRecords */ 603 }; 604 605 typedef struct HB_ChainPosClassRule_ HB_ChainPosClassRule; 606 607 608 struct HB_ChainPosClassSet_ 609 { 610 HB_UShort ChainPosClassRuleCount; 611 /* number of ChainPosClassRule 612 tables */ 613 HB_ChainPosClassRule* ChainPosClassRule; 614 /* array of ChainPosClassRule 615 tables */ 616 }; 617 618 typedef struct HB_ChainPosClassSet_ HB_ChainPosClassSet; 619 620 621 /* The `MaxXXXLength' fields are not defined in the TTO specification 622 but simplifies the implementation of this format. It holds the 623 maximal context length used in the specific context rules. */ 624 625 struct HB_ChainContextPosFormat2_ 626 { 627 HB_Coverage Coverage; /* Coverage table */ 628 629 HB_UShort MaxBacktrackLength; 630 /* maximal backtrack length */ 631 HB_ClassDefinition BacktrackClassDef; 632 /* BacktrackClassDef table */ 633 HB_UShort MaxInputLength; 634 /* maximal input length */ 635 HB_ClassDefinition InputClassDef; 636 /* InputClassDef table */ 637 HB_UShort MaxLookaheadLength; 638 /* maximal lookahead length */ 639 HB_ClassDefinition LookaheadClassDef; 640 /* LookaheadClassDef table */ 641 642 HB_UShort ChainPosClassSetCount; 643 /* number of ChainPosClassSet 644 tables */ 645 HB_ChainPosClassSet* ChainPosClassSet; 646 /* array of ChainPosClassSet 647 tables */ 648 }; 649 650 typedef struct HB_ChainContextPosFormat2_ HB_ChainContextPosFormat2; 651 652 653 struct HB_ChainContextPosFormat3_ 654 { 655 HB_UShort BacktrackGlyphCount; 656 /* number of backtrack glyphs */ 657 HB_Coverage* BacktrackCoverage; 658 /* array of backtrack Coverage 659 tables */ 660 HB_UShort InputGlyphCount; 661 /* number of input glyphs */ 662 HB_Coverage* InputCoverage; 663 /* array of input coverage 664 tables */ 665 HB_UShort LookaheadGlyphCount; 666 /* number of lookahead glyphs */ 667 HB_Coverage* LookaheadCoverage; 668 /* array of lookahead coverage 669 tables */ 670 HB_UShort PosCount; /* number of PosLookupRecords */ 671 HB_PosLookupRecord* PosLookupRecord; 672 /* array of substitution lookups */ 673 }; 674 675 typedef struct HB_ChainContextPosFormat3_ HB_ChainContextPosFormat3; 676 677 678 struct HB_ChainContextPos_ 679 { 680 HB_Byte PosFormat; /* 1, 2, or 3 */ 681 682 union 683 { 684 HB_ChainContextPosFormat1 ccpf1; 685 HB_ChainContextPosFormat2 ccpf2; 686 HB_ChainContextPosFormat3 ccpf3; 687 } ccpf; 688 }; 689 690 typedef struct HB_ChainContextPos_ HB_ChainContextPos; 691 692 693 #if 0 694 /* LookupType 10 */ 695 struct HB_ExtensionPos_ 696 { 697 HB_UShort PosFormat; /* always 1 */ 698 HB_UShort LookuptType; /* lookup-type of referenced subtable */ 699 HB_GPOS_SubTable *subtable; /* referenced subtable */ 700 }; 701 702 typedef struct HB_ExtensionPos_ HB_ExtensionPos; 703 #endif 704 705 706 union HB_GPOS_SubTable_ 707 { 708 HB_SinglePos single; 709 HB_PairPos pair; 710 HB_CursivePos cursive; 711 HB_MarkBasePos markbase; 712 HB_MarkLigPos marklig; 713 HB_MarkMarkPos markmark; 714 HB_ContextPos context; 715 HB_ChainContextPos chain; 716 }; 717 718 typedef union HB_GPOS_SubTable_ HB_GPOS_SubTable; 719 720 721 722 HB_INTERNAL HB_Error 723 _HB_GPOS_Load_SubTable( HB_GPOS_SubTable* st, 724 HB_Stream stream, 725 HB_UShort lookup_type ); 726 727 HB_INTERNAL void 728 _HB_GPOS_Free_SubTable( HB_GPOS_SubTable* st, 729 HB_UShort lookup_type ); 730 731 HB_END_HEADER 732 733 #endif /* HARFBUZZ_GPOS_PRIVATE_H */ 734