summaryrefslogtreecommitdiffstats
path: root/thirdparties/common/include/libfreetype/freetype2/freetype/tttables.h
blob: fe07117b0b41dda7ce951025e22f8c0ae1c79715 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
/***************************************************************************/
/*                                                                         */
/*  tttables.h                                                             */
/*                                                                         */
/*    Basic SFNT/TrueType tables definitions and interface                 */
/*    (specification only).                                                */
/*                                                                         */
/*  Copyright 1996-2005, 2008-2012 by                                      */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#ifndef __TTTABLES_H__
#define __TTTABLES_H__


#include <ft2build.h>
#include FT_FREETYPE_H

#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif


FT_BEGIN_HEADER

  /*************************************************************************/
  /*                                                                       */
  /* <Section>                                                             */
  /*    truetype_tables                                                    */
  /*                                                                       */
  /* <Title>                                                               */
  /*    TrueType Tables                                                    */
  /*                                                                       */
  /* <Abstract>                                                            */
  /*    TrueType specific table types and functions.                       */
  /*                                                                       */
  /* <Description>                                                         */
  /*    This section contains the definition of TrueType-specific tables   */
  /*    as well as some routines used to access and process them.          */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_Header                                                          */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType font header table.  All       */
  /*    fields follow the TrueType specification.                          */
  /*                                                                       */
  typedef struct  TT_Header_
  {
    FT_Fixed   Table_Version;
    FT_Fixed   Font_Revision;

    FT_Long    CheckSum_Adjust;
    FT_Long    Magic_Number;

    FT_UShort  Flags;
    FT_UShort  Units_Per_EM;

    FT_Long    Created [2];
    FT_Long    Modified[2];

    FT_Short   xMin;
    FT_Short   yMin;
    FT_Short   xMax;
    FT_Short   yMax;

    FT_UShort  Mac_Style;
    FT_UShort  Lowest_Rec_PPEM;

    FT_Short   Font_Direction;
    FT_Short   Index_To_Loc_Format;
    FT_Short   Glyph_Data_Format;

  } TT_Header;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_HoriHeader                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType horizontal header, the `hhea' */
  /*    table, as well as the corresponding horizontal metrics table,      */
  /*    i.e., the `hmtx' table.                                            */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    Version                :: The table version.                       */
  /*                                                                       */
  /*    Ascender               :: The font's ascender, i.e., the distance  */
  /*                              from the baseline to the top-most of all */
  /*                              glyph points found in the font.          */
  /*                                                                       */
  /*                              This value is invalid in many fonts, as  */
  /*                              it is usually set by the font designer,  */
  /*                              and often reflects only a portion of the */
  /*                              glyphs found in the font (maybe ASCII).  */
  /*                                                                       */
  /*                              You should use the `sTypoAscender' field */
  /*                              of the OS/2 table instead if you want    */
  /*                              the correct one.                         */
  /*                                                                       */
  /*    Descender              :: The font's descender, i.e., the distance */
  /*                              from the baseline to the bottom-most of  */
  /*                              all glyph points found in the font.  It  */
  /*                              is negative.                             */
  /*                                                                       */
  /*                              This value is invalid in many fonts, as  */
  /*                              it is usually set by the font designer,  */
  /*                              and often reflects only a portion of the */
  /*                              glyphs found in the font (maybe ASCII).  */
  /*                                                                       */
  /*                              You should use the `sTypoDescender'      */
  /*                              field of the OS/2 table instead if you   */
  /*                              want the correct one.                    */
  /*                                                                       */
  /*    Line_Gap               :: The font's line gap, i.e., the distance  */
  /*                              to add to the ascender and descender to  */
  /*                              get the BTB, i.e., the                   */
  /*                              baseline-to-baseline distance for the    */
  /*                              font.                                    */
  /*                                                                       */
  /*    advance_Width_Max      :: This field is the maximum of all advance */
  /*                              widths found in the font.  It can be     */
  /*                              used to compute the maximum width of an  */
  /*                              arbitrary string of text.                */
  /*                                                                       */
  /*    min_Left_Side_Bearing  :: The minimum left side bearing of all     */
  /*                              glyphs within the font.                  */
  /*                                                                       */
  /*    min_Right_Side_Bearing :: The minimum right side bearing of all    */
  /*                              glyphs within the font.                  */
  /*                                                                       */
  /*    xMax_Extent            :: The maximum horizontal extent (i.e., the */
  /*                              `width' of a glyph's bounding box) for   */
  /*                              all glyphs in the font.                  */
  /*                                                                       */
  /*    caret_Slope_Rise       :: The rise coefficient of the cursor's     */
  /*                              slope of the cursor (slope=rise/run).    */
  /*                                                                       */
  /*    caret_Slope_Run        :: The run coefficient of the cursor's      */
  /*                              slope.                                   */
  /*                                                                       */
  /*    Reserved               :: 8~reserved bytes.                        */
  /*                                                                       */
  /*    metric_Data_Format     :: Always~0.                                */
  /*                                                                       */
  /*    number_Of_HMetrics     :: Number of HMetrics entries in the `hmtx' */
  /*                              table -- this value can be smaller than  */
  /*                              the total number of glyphs in the font.  */
  /*                                                                       */
  /*    long_metrics           :: A pointer into the `hmtx' table.         */
  /*                                                                       */
  /*    short_metrics          :: A pointer into the `hmtx' table.         */
  /*                                                                       */
  /* <Note>                                                                */
  /*    IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should   */
  /*               be identical except for the names of their fields which */
  /*               are different.                                          */
  /*                                                                       */
  /*               This ensures that a single function in the `ttload'     */
  /*               module is able to read both the horizontal and vertical */
  /*               headers.                                                */
  /*                                                                       */
  typedef struct  TT_HoriHeader_
  {
    FT_Fixed   Version;
    FT_Short   Ascender;
    FT_Short   Descender;
    FT_Short   Line_Gap;

    FT_UShort  advance_Width_Max;      /* advance width maximum */

    FT_Short   min_Left_Side_Bearing;  /* minimum left-sb       */
    FT_Short   min_Right_Side_Bearing; /* minimum right-sb      */
    FT_Short   xMax_Extent;            /* xmax extents          */
    FT_Short   caret_Slope_Rise;
    FT_Short   caret_Slope_Run;
    FT_Short   caret_Offset;

    FT_Short   Reserved[4];

    FT_Short   metric_Data_Format;
    FT_UShort  number_Of_HMetrics;

    /* The following fields are not defined by the TrueType specification */
    /* but they are used to connect the metrics header to the relevant    */
    /* `HMTX' table.                                                      */

    void*      long_metrics;
    void*      short_metrics;

  } TT_HoriHeader;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_VertHeader                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType vertical header, the `vhea'   */
  /*    table, as well as the corresponding vertical metrics table, i.e.,  */
  /*    the `vmtx' table.                                                  */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    Version                 :: The table version.                      */
  /*                                                                       */
  /*    Ascender                :: The font's ascender, i.e., the distance */
  /*                               from the baseline to the top-most of    */
  /*                               all glyph points found in the font.     */
  /*                                                                       */
  /*                               This value is invalid in many fonts, as */
  /*                               it is usually set by the font designer, */
  /*                               and often reflects only a portion of    */
  /*                               the glyphs found in the font (maybe     */
  /*                               ASCII).                                 */
  /*                                                                       */
  /*                               You should use the `sTypoAscender'      */
  /*                               field of the OS/2 table instead if you  */
  /*                               want the correct one.                   */
  /*                                                                       */
  /*    Descender               :: The font's descender, i.e., the         */
  /*                               distance from the baseline to the       */
  /*                               bottom-most of all glyph points found   */
  /*                               in the font.  It is negative.           */
  /*                                                                       */
  /*                               This value is invalid in many fonts, as */
  /*                               it is usually set by the font designer, */
  /*                               and often reflects only a portion of    */
  /*                               the glyphs found in the font (maybe     */
  /*                               ASCII).                                 */
  /*                                                                       */
  /*                               You should use the `sTypoDescender'     */
  /*                               field of the OS/2 table instead if you  */
  /*                               want the correct one.                   */
  /*                                                                       */
  /*    Line_Gap                :: The font's line gap, i.e., the distance */
  /*                               to add to the ascender and descender to */
  /*                               get the BTB, i.e., the                  */
  /*                               baseline-to-baseline distance for the   */
  /*                               font.                                   */
  /*                                                                       */
  /*    advance_Height_Max      :: This field is the maximum of all        */
  /*                               advance heights found in the font.  It  */
  /*                               can be used to compute the maximum      */
  /*                               height of an arbitrary string of text.  */
  /*                                                                       */
  /*    min_Top_Side_Bearing    :: The minimum top side bearing of all     */
  /*                               glyphs within the font.                 */
  /*                                                                       */
  /*    min_Bottom_Side_Bearing :: The minimum bottom side bearing of all  */
  /*                               glyphs within the font.                 */
  /*                                                                       */
  /*    yMax_Extent             :: The maximum vertical extent (i.e., the  */
  /*                               `height' of a glyph's bounding box) for */
  /*                               all glyphs in the font.                 */
  /*                                                                       */
  /*    caret_Slope_Rise        :: The rise coefficient of the cursor's    */
  /*                               slope of the cursor (slope=rise/run).   */
  /*                                                                       */
  /*    caret_Slope_Run         :: The run coefficient of the cursor's     */
  /*                               slope.                                  */
  /*                                                                       */
  /*    caret_Offset            :: The cursor's offset for slanted fonts.  */
  /*                               This value is `reserved' in vmtx        */
  /*                               version 1.0.                            */
  /*                                                                       */
  /*    Reserved                :: 8~reserved bytes.                       */
  /*                                                                       */
  /*    metric_Data_Format      :: Always~0.                               */
  /*                                                                       */
  /*    number_Of_HMetrics      :: Number of VMetrics entries in the       */
  /*                               `vmtx' table -- this value can be       */
  /*                               smaller than the total number of glyphs */
  /*                               in the font.                            */
  /*                                                                       */
  /*    long_metrics           :: A pointer into the `vmtx' table.         */
  /*                                                                       */
  /*    short_metrics          :: A pointer into the `vmtx' table.         */
  /*                                                                       */
  /* <Note>                                                                */
  /*    IMPORTANT: The TT_HoriHeader and TT_VertHeader structures should   */
  /*               be identical except for the names of their fields which */
  /*               are different.                                          */
  /*                                                                       */
  /*               This ensures that a single function in the `ttload'     */
  /*               module is able to read both the horizontal and vertical */
  /*               headers.                                                */
  /*                                                                       */
  typedef struct  TT_VertHeader_
  {
    FT_Fixed   Version;
    FT_Short   Ascender;
    FT_Short   Descender;
    FT_Short   Line_Gap;

    FT_UShort  advance_Height_Max;      /* advance height maximum */

    FT_Short   min_Top_Side_Bearing;    /* minimum left-sb or top-sb       */
    FT_Short   min_Bottom_Side_Bearing; /* minimum right-sb or bottom-sb   */
    FT_Short   yMax_Extent;             /* xmax or ymax extents            */
    FT_Short   caret_Slope_Rise;
    FT_Short   caret_Slope_Run;
    FT_Short   caret_Offset;

    FT_Short   Reserved[4];

    FT_Short   metric_Data_Format;
    FT_UShort  number_Of_VMetrics;

    /* The following fields are not defined by the TrueType specification */
    /* but they're used to connect the metrics header to the relevant     */
    /* `HMTX' or `VMTX' table.                                            */

    void*      long_metrics;
    void*      short_metrics;

  } TT_VertHeader;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_OS2                                                             */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType OS/2 table. This is the long  */
  /*    table version.  All fields comply to the TrueType specification.   */
  /*                                                                       */
  /*    Note that we now support old Mac fonts which do not include an     */
  /*    OS/2 table.  In this case, the `version' field is always set to    */
  /*    0xFFFF.                                                            */
  /*                                                                       */
  typedef struct  TT_OS2_
  {
    FT_UShort  version;                /* 0x0001 - more or 0xFFFF */
    FT_Short   xAvgCharWidth;
    FT_UShort  usWeightClass;
    FT_UShort  usWidthClass;
    FT_Short   fsType;
    FT_Short   ySubscriptXSize;
    FT_Short   ySubscriptYSize;
    FT_Short   ySubscriptXOffset;
    FT_Short   ySubscriptYOffset;
    FT_Short   ySuperscriptXSize;
    FT_Short   ySuperscriptYSize;
    FT_Short   ySuperscriptXOffset;
    FT_Short   ySuperscriptYOffset;
    FT_Short   yStrikeoutSize;
    FT_Short   yStrikeoutPosition;
    FT_Short   sFamilyClass;

    FT_Byte    panose[10];

    FT_ULong   ulUnicodeRange1;        /* Bits 0-31   */
    FT_ULong   ulUnicodeRange2;        /* Bits 32-63  */
    FT_ULong   ulUnicodeRange3;        /* Bits 64-95  */
    FT_ULong   ulUnicodeRange4;        /* Bits 96-127 */

    FT_Char    achVendID[4];

    FT_UShort  fsSelection;
    FT_UShort  usFirstCharIndex;
    FT_UShort  usLastCharIndex;
    FT_Short   sTypoAscender;
    FT_Short   sTypoDescender;
    FT_Short   sTypoLineGap;
    FT_UShort  usWinAscent;
    FT_UShort  usWinDescent;

    /* only version 1 tables: */

    FT_ULong   ulCodePageRange1;       /* Bits 0-31   */
    FT_ULong   ulCodePageRange2;       /* Bits 32-63  */

    /* only version 2 tables: */

    FT_Short   sxHeight;
    FT_Short   sCapHeight;
    FT_UShort  usDefaultChar;
    FT_UShort  usBreakChar;
    FT_UShort  usMaxContext;

  } TT_OS2;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_Postscript                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType PostScript table.  All fields */
  /*    comply to the TrueType specification.  This structure does not     */
  /*    reference the PostScript glyph names, which can be nevertheless    */
  /*    accessed with the `ttpost' module.                                 */
  /*                                                                       */
  typedef struct  TT_Postscript_
  {
    FT_Fixed  FormatType;
    FT_Fixed  italicAngle;
    FT_Short  underlinePosition;
    FT_Short  underlineThickness;
    FT_ULong  isFixedPitch;
    FT_ULong  minMemType42;
    FT_ULong  maxMemType42;
    FT_ULong  minMemType1;
    FT_ULong  maxMemType1;

    /* Glyph names follow in the file, but we don't   */
    /* load them by default.  See the ttpost.c file.  */

  } TT_Postscript;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_PCLT                                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    A structure used to model a TrueType PCLT table.  All fields       */
  /*    comply to the TrueType specification.                              */
  /*                                                                       */
  typedef struct  TT_PCLT_
  {
    FT_Fixed   Version;
    FT_ULong   FontNumber;
    FT_UShort  Pitch;
    FT_UShort  xHeight;
    FT_UShort  Style;
    FT_UShort  TypeFamily;
    FT_UShort  CapHeight;
    FT_UShort  SymbolSet;
    FT_Char    TypeFace[16];
    FT_Char    CharacterComplement[8];
    FT_Char    FileName[6];
    FT_Char    StrokeWeight;
    FT_Char    WidthType;
    FT_Byte    SerifStyle;
    FT_Byte    Reserved;

  } TT_PCLT;


  /*************************************************************************/
  /*                                                                       */
  /* <Struct>                                                              */
  /*    TT_MaxProfile                                                      */
  /*                                                                       */
  /* <Description>                                                         */
  /*    The maximum profile is a table containing many max values which    */
  /*    can be used to pre-allocate arrays.  This ensures that no memory   */
  /*    allocation occurs during a glyph load.                             */
  /*                                                                       */
  /* <Fields>                                                              */
  /*    version               :: The version number.                       */
  /*                                                                       */
  /*    numGlyphs             :: The number of glyphs in this TrueType     */
  /*                             font.                                     */
  /*                                                                       */
  /*    maxPoints             :: The maximum number of points in a         */
  /*                             non-composite TrueType glyph.  See also   */
  /*                             the structure element                     */
  /*                             `maxCompositePoints'.                     */
  /*                                                                       */
  /*    maxContours           :: The maximum number of contours in a       */
  /*                             non-composite TrueType glyph.  See also   */
  /*                             the structure element                     */
  /*                             `maxCompositeContours'.                   */
  /*                                                                       */
  /*    maxCompositePoints    :: The maximum number of points in a         */
  /*                             composite TrueType glyph.  See also the   */
  /*                             structure element `maxPoints'.            */
  /*                                                                       */
  /*    maxCompositeContours  :: The maximum number of contours in a       */
  /*                             composite TrueType glyph.  See also the   */
  /*                             structure element `maxContours'.          */
  /*                                                                       */
  /*    maxZones              :: The maximum number of zones used for      */
  /*                             glyph hinting.                            */
  /*                                                                       */
  /*    maxTwilightPoints     :: The maximum number of points in the       */
  /*                             twilight zone used for glyph hinting.     */
  /*                                                                       */
  /*    maxStorage            :: The maximum number of elements in the     */
  /*                             storage area used for glyph hinting.      */
  /*                                                                       */
  /*    maxFunctionDefs       :: The maximum number of function            */
  /*                             definitions in the TrueType bytecode for  */
  /*                             this font.                                */
  /*                                                                       */
  /*    maxInstructionDefs    :: The maximum number of instruction         */
  /*                             definitions in the TrueType bytecode for  */
  /*                             this font.                                */
  /*                                                                       */
  /*    maxStackElements      :: The maximum number of stack elements used */
  /*                             during bytecode interpretation.           */
  /*                                                                       */
  /*    maxSizeOfInstructions :: The maximum number of TrueType opcodes    */
  /*                             used for glyph hinting.                   */
  /*                                                                       */
  /*    maxComponentElements  :: The maximum number of simple (i.e., non-  */
  /*                             composite) glyphs in a composite glyph.   */
  /*                                                                       */
  /*    maxComponentDepth     :: The maximum nesting depth of composite    */
  /*                             glyphs.                                   */
  /*                                                                       */
  /* <Note>                                                                */
  /*    This structure is only used during font loading.                   */
  /*                                                                       */
  typedef struct  TT_MaxProfile_
  {
    FT_Fixed   version;
    FT_UShort  numGlyphs;
    FT_UShort  maxPoints;
    FT_UShort  maxContours;
    FT_UShort  maxCompositePoints;
    FT_UShort  maxCompositeContours;
    FT_UShort  maxZones;
    FT_UShort  maxTwilightPoints;
    FT_UShort  maxStorage;
    FT_UShort  maxFunctionDefs;
    FT_UShort  maxInstructionDefs;
    FT_UShort  maxStackElements;
    FT_UShort  maxSizeOfInstructions;
    FT_UShort  maxComponentElements;
    FT_UShort  maxComponentDepth;

  } TT_MaxProfile;


  /*************************************************************************/
  /*                                                                       */
  /* <Enum>                                                                */
  /*    FT_Sfnt_Tag                                                        */
  /*                                                                       */
  /* <Description>                                                         */
  /*    An enumeration used to specify the index of an SFNT table.         */
  /*    Used in the @FT_Get_Sfnt_Table API function.                       */
  /*                                                                       */
  typedef enum  FT_Sfnt_Tag_
  {
    ft_sfnt_head = 0,    /* TT_Header     */
    ft_sfnt_maxp = 1,    /* TT_MaxProfile */
    ft_sfnt_os2  = 2,    /* TT_OS2        */
    ft_sfnt_hhea = 3,    /* TT_HoriHeader */
    ft_sfnt_vhea = 4,    /* TT_VertHeader */
    ft_sfnt_post = 5,    /* TT_Postscript */
    ft_sfnt_pclt = 6,    /* TT_PCLT       */

    sfnt_max   /* internal end mark */

  } FT_Sfnt_Tag;

  /* */


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_Sfnt_Table                                                  */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Return a pointer to a given SFNT table within a face.              */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A handle to the source.                                    */
  /*                                                                       */
  /*    tag  :: The index of the SFNT table.                               */
  /*                                                                       */
  /* <Return>                                                              */
  /*    A type-less pointer to the table.  This will be~0 in case of       */
  /*    error, or if the corresponding table was not found *OR* loaded     */
  /*    from the file.                                                     */
  /*                                                                       */
  /*    Use a typecast according to `tag' to access the structure          */
  /*    elements.                                                          */
  /*                                                                       */
  /* <Note>                                                                */
  /*    The table is owned by the face object and disappears with it.      */
  /*                                                                       */
  /*    This function is only useful to access SFNT tables that are loaded */
  /*    by the sfnt, truetype, and opentype drivers.  See @FT_Sfnt_Tag for */
  /*    a list.                                                            */
  /*                                                                       */
  /*    Here an example how to access the `vhea' table:                    */
  /*                                                                       */
  /*    {                                                                  */
  /*      TT_VertHeader*  vert_header;                                     */
  /*                                                                       */
  /*                                                                       */
  /*      vert_header =                                                    */
  /*        (TT_VertHeader*)FT_Get_Sfnt_Table( face, ft_sfnt_vhea );       */
  /*    }                                                                  */
  /*                                                                       */
  FT_EXPORT( void* )
  FT_Get_Sfnt_Table( FT_Face      face,
                     FT_Sfnt_Tag  tag );


 /**************************************************************************
  *
  * @function:
  *   FT_Load_Sfnt_Table
  *
  * @description:
  *   Load any font table into client memory.
  *
  * @input:
  *   face ::
  *     A handle to the source face.
  *
  *   tag ::
  *     The four-byte tag of the table to load.  Use the value~0 if you want
  *     to access the whole font file.  Otherwise, you can use one of the
  *     definitions found in the @FT_TRUETYPE_TAGS_H file, or forge a new
  *     one with @FT_MAKE_TAG.
  *
  *   offset ::
  *     The starting offset in the table (or file if tag == 0).
  *
  * @output:
  *   buffer ::
  *     The target buffer address.  The client must ensure that the memory
  *     array is big enough to hold the data.
  *
  * @inout:
  *   length ::
  *     If the `length' parameter is NULL, then try to load the whole table.
  *     Return an error code if it fails.
  *
  *     Else, if `*length' is~0, exit immediately while returning the
  *     table's (or file) full size in it.
  *
  *     Else the number of bytes to read from the table or file, from the
  *     starting offset.
  *
  * @return:
  *   FreeType error code.  0~means success.
  *
  * @note:
  *   If you need to determine the table's length you should first call this
  *   function with `*length' set to~0, as in the following example:
  *
  *     {
  *       FT_ULong  length = 0;
  *
  *
  *       error = FT_Load_Sfnt_Table( face, tag, 0, NULL, &length );
  *       if ( error ) { ... table does not exist ... }
  *
  *       buffer = malloc( length );
  *       if ( buffer == NULL ) { ... not enough memory ... }
  *
  *       error = FT_Load_Sfnt_Table( face, tag, 0, buffer, &length );
  *       if ( error ) { ... could not load table ... }
  *     }
  */
  FT_EXPORT( FT_Error )
  FT_Load_Sfnt_Table( FT_Face    face,
                      FT_ULong   tag,
                      FT_Long    offset,
                      FT_Byte*   buffer,
                      FT_ULong*  length );


 /**************************************************************************
  *
  * @function:
  *   FT_Sfnt_Table_Info
  *
  * @description:
  *   Return information on an SFNT table.
  *
  * @input:
  *   face ::
  *     A handle to the source face.
  *
  *   table_index ::
  *     The index of an SFNT table.  The function returns
  *     FT_Err_Table_Missing for an invalid value.
  *
  * @inout:
  *   tag ::
  *     The name tag of the SFNT table.  If the value is NULL, `table_index'
  *     is ignored, and `length' returns the number of SFNT tables in the
  *     font.
  *
  * @output:
  *   length ::
  *     The length of the SFNT table (or the number of SFNT tables, depending
  *     on `tag').
  *
  * @return:
  *   FreeType error code.  0~means success.
  *
  * @note:
  *   While parsing fonts, FreeType handles SFNT tables with length zero as
  *   missing.
  *
  */
  FT_EXPORT( FT_Error )
  FT_Sfnt_Table_Info( FT_Face    face,
                      FT_UInt    table_index,
                      FT_ULong  *tag,
                      FT_ULong  *length );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_CMap_Language_ID                                            */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Return TrueType/sfnt specific cmap language ID.  Definitions of    */
  /*    language ID values are in `freetype/ttnameid.h'.                   */
  /*                                                                       */
  /* <Input>                                                               */
  /*    charmap ::                                                         */
  /*      The target charmap.                                              */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The language ID of `charmap'.  If `charmap' doesn't belong to a    */
  /*    TrueType/sfnt face, just return~0 as the default value.            */
  /*                                                                       */
  /*    For a format~14 cmap (to access Unicode IVS), the return value is  */
  /*    0xFFFFFFFF.                                                        */
  /*                                                                       */
  FT_EXPORT( FT_ULong )
  FT_Get_CMap_Language_ID( FT_CharMap  charmap );


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    FT_Get_CMap_Format                                                 */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Return TrueType/sfnt specific cmap format.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    charmap ::                                                         */
  /*      The target charmap.                                              */
  /*                                                                       */
  /* <Return>                                                              */
  /*    The format of `charmap'.  If `charmap' doesn't belong to a         */
  /*    TrueType/sfnt face, return -1.                                     */
  /*                                                                       */
  FT_EXPORT( FT_Long )
  FT_Get_CMap_Format( FT_CharMap  charmap );

  /* */


FT_END_HEADER

#endif /* __TTTABLES_H__ */


/* END */
OpenPOWER on IntegriCloud