src/3rdparty/harfbuzz/src/harfbuzz-gpos-private.h

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