summaryrefslogtreecommitdiff
path: root/Build/source/libs/freetype2/freetype-src/src/truetype/ttgxvar.h
blob: ded9ea1d6dfa6759155ca197ad51443a83a4b387 (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
/****************************************************************************
 *
 * ttgxvar.h
 *
 *   TrueType GX Font Variation loader (specification)
 *
 * Copyright (C) 2004-2021 by
 * David Turner, Robert Wilhelm, Werner Lemberg and George Williams.
 *
 * 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 TTGXVAR_H_
#define TTGXVAR_H_


#include "ttobjs.h"


FT_BEGIN_HEADER


#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

  /**************************************************************************
   *
   * @Struct:
   *   GX_AVarCorrespondenceRec
   *
   * @Description:
   *   A data structure representing `shortFracCorrespondence' in `avar'
   *   table according to the specifications from Apple.
   */
  typedef struct  GX_AVarCorrespondenceRec_
  {
    FT_Fixed  fromCoord;
    FT_Fixed  toCoord;

  } GX_AVarCorrespondenceRec_, *GX_AVarCorrespondence;


  /**************************************************************************
   *
   * @Struct:
   *   GX_AVarRec
   *
   * @Description:
   *   Data from the segment field of `avar' table.
   *   There is one of these for each axis.
   */
  typedef struct  GX_AVarSegmentRec_
  {
    FT_UShort              pairCount;
    GX_AVarCorrespondence  correspondence; /* array with pairCount entries */

  } GX_AVarSegmentRec, *GX_AVarSegment;


  typedef struct  GX_ItemVarDataRec_
  {
    FT_UInt    itemCount;      /* number of delta sets per item         */
    FT_UInt    regionIdxCount; /* number of region indices in this data */
    FT_UInt*   regionIndices;  /* array of `regionCount' indices;       */
                               /* these index `varRegionList'           */
    FT_Short*  deltaSet;       /* array of `itemCount' deltas           */
                               /* use `innerIndex' for this array       */

  } GX_ItemVarDataRec, *GX_ItemVarData;


  /* contribution of one axis to a region */
  typedef struct  GX_AxisCoordsRec_
  {
    FT_Fixed  startCoord;
    FT_Fixed  peakCoord;      /* zero means no effect (factor = 1) */
    FT_Fixed  endCoord;

  } GX_AxisCoordsRec, *GX_AxisCoords;


  typedef struct  GX_VarRegionRec_
  {
    GX_AxisCoords  axisList;               /* array of axisCount records */

  } GX_VarRegionRec, *GX_VarRegion;


  /* item variation store */
  typedef struct  GX_ItemVarStoreRec_
  {
    FT_UInt         dataCount;
    GX_ItemVarData  varData;            /* array of dataCount records;     */
                                        /* use `outerIndex' for this array */
    FT_UShort     axisCount;
    FT_UInt       regionCount;          /* total number of regions defined */
    GX_VarRegion  varRegionList;

  } GX_ItemVarStoreRec, *GX_ItemVarStore;


  typedef struct  GX_DeltaSetIdxMapRec_
  {
    FT_ULong  mapCount;
    FT_UInt*  outerIndex;               /* indices to item var data */
    FT_UInt*  innerIndex;               /* indices to delta set     */

  } GX_DeltaSetIdxMapRec, *GX_DeltaSetIdxMap;


  /**************************************************************************
   *
   * @Struct:
   *   GX_HVVarTableRec
   *
   * @Description:
   *   Data from either the `HVAR' or `VVAR' table.
   */
  typedef struct  GX_HVVarTableRec_
  {
    GX_ItemVarStoreRec    itemStore;        /* Item Variation Store  */
    GX_DeltaSetIdxMapRec  widthMap;         /* Advance Width Mapping */

#if 0
    GX_DeltaSetIdxMapRec  lsbMap;           /* not implemented */
    GX_DeltaSetIdxMapRec  rsbMap;           /* not implemented */

    GX_DeltaSetIdxMapRec  tsbMap;           /* not implemented */
    GX_DeltaSetIdxMapRec  bsbMap;           /* not implemented */
    GX_DeltaSetIdxMapRec  vorgMap;          /* not implemented */
#endif

  } GX_HVVarTableRec, *GX_HVVarTable;


#define MVAR_TAG_GASP_0  FT_MAKE_TAG( 'g', 's', 'p', '0' )
#define MVAR_TAG_GASP_1  FT_MAKE_TAG( 'g', 's', 'p', '1' )
#define MVAR_TAG_GASP_2  FT_MAKE_TAG( 'g', 's', 'p', '2' )
#define MVAR_TAG_GASP_3  FT_MAKE_TAG( 'g', 's', 'p', '3' )
#define MVAR_TAG_GASP_4  FT_MAKE_TAG( 'g', 's', 'p', '4' )
#define MVAR_TAG_GASP_5  FT_MAKE_TAG( 'g', 's', 'p', '5' )
#define MVAR_TAG_GASP_6  FT_MAKE_TAG( 'g', 's', 'p', '6' )
#define MVAR_TAG_GASP_7  FT_MAKE_TAG( 'g', 's', 'p', '7' )
#define MVAR_TAG_GASP_8  FT_MAKE_TAG( 'g', 's', 'p', '8' )
#define MVAR_TAG_GASP_9  FT_MAKE_TAG( 'g', 's', 'p', '9' )

#define MVAR_TAG_CPHT  FT_MAKE_TAG( 'c', 'p', 'h', 't' )
#define MVAR_TAG_HASC  FT_MAKE_TAG( 'h', 'a', 's', 'c' )
#define MVAR_TAG_HCLA  FT_MAKE_TAG( 'h', 'c', 'l', 'a' )
#define MVAR_TAG_HCLD  FT_MAKE_TAG( 'h', 'c', 'l', 'd' )
#define MVAR_TAG_HCOF  FT_MAKE_TAG( 'h', 'c', 'o', 'f' )
#define MVAR_TAG_HCRN  FT_MAKE_TAG( 'h', 'c', 'r', 'n' )
#define MVAR_TAG_HCRS  FT_MAKE_TAG( 'h', 'c', 'r', 's' )
#define MVAR_TAG_HDSC  FT_MAKE_TAG( 'h', 'd', 's', 'c' )
#define MVAR_TAG_HLGP  FT_MAKE_TAG( 'h', 'l', 'g', 'p' )
#define MVAR_TAG_SBXO  FT_MAKE_TAG( 's', 'b', 'x', 'o' )
#define MVAR_TAG_SBXS  FT_MAKE_TAG( 's', 'b', 'x', 's' )
#define MVAR_TAG_SBYO  FT_MAKE_TAG( 's', 'b', 'y', 'o' )
#define MVAR_TAG_SBYS  FT_MAKE_TAG( 's', 'b', 'y', 's' )
#define MVAR_TAG_SPXO  FT_MAKE_TAG( 's', 'p', 'x', 'o' )
#define MVAR_TAG_SPXS  FT_MAKE_TAG( 's', 'p', 'x', 's' )
#define MVAR_TAG_SPYO  FT_MAKE_TAG( 's', 'p', 'y', 'o' )
#define MVAR_TAG_SPYS  FT_MAKE_TAG( 's', 'p', 'y', 's' )
#define MVAR_TAG_STRO  FT_MAKE_TAG( 's', 't', 'r', 'o' )
#define MVAR_TAG_STRS  FT_MAKE_TAG( 's', 't', 'r', 's' )
#define MVAR_TAG_UNDO  FT_MAKE_TAG( 'u', 'n', 'd', 'o' )
#define MVAR_TAG_UNDS  FT_MAKE_TAG( 'u', 'n', 'd', 's' )
#define MVAR_TAG_VASC  FT_MAKE_TAG( 'v', 'a', 's', 'c' )
#define MVAR_TAG_VCOF  FT_MAKE_TAG( 'v', 'c', 'o', 'f' )
#define MVAR_TAG_VCRN  FT_MAKE_TAG( 'v', 'c', 'r', 'n' )
#define MVAR_TAG_VCRS  FT_MAKE_TAG( 'v', 'c', 'r', 's' )
#define MVAR_TAG_VDSC  FT_MAKE_TAG( 'v', 'd', 's', 'c' )
#define MVAR_TAG_VLGP  FT_MAKE_TAG( 'v', 'l', 'g', 'p' )
#define MVAR_TAG_XHGT  FT_MAKE_TAG( 'x', 'h', 'g', 't' )


  typedef struct  GX_ValueRec_
  {
    FT_ULong   tag;
    FT_UShort  outerIndex;
    FT_UShort  innerIndex;

    FT_Short  unmodified;  /* values are either FT_Short or FT_UShort */

  } GX_ValueRec, *GX_Value;


  /**************************************************************************
   *
   * @Struct:
   *   GX_MVarTableRec
   *
   * @Description:
   *   Data from the `MVAR' table.
   */
  typedef struct  GX_MVarTableRec_
  {
    FT_UShort  valueCount;

    GX_ItemVarStoreRec  itemStore;        /* Item Variation Store  */
    GX_Value            values;           /* Value Records         */

  } GX_MVarTableRec, *GX_MVarTable;


  /**************************************************************************
   *
   * @Struct:
   *   GX_BlendRec
   *
   * @Description:
   *   Data for interpolating a font from a distortable font specified
   *   by the GX *var tables ([fgcahvm]var).
   *
   * @Fields:
   *   num_axis ::
   *     The number of axes along which interpolation may happen.
   *
   *   coords ::
   *     An array of design coordinates (in user space) indicating the
   *     contribution along each axis to the final interpolated font.
   *     `normalizedcoords' holds the same values.
   *
   *   normalizedcoords ::
   *     An array of normalized values (between [-1,1]) indicating the
   *     contribution along each axis to the final interpolated font.
   *     `coords' holds the same values.
   *
   *   mmvar ::
   *     Data from the `fvar' table.
   *
   *   mmvar_len ::
   *     The length of the `mmvar' structure.
   *
   *   normalized_stylecoords ::
   *     A two-dimensional array that holds the named instance data from
   *     `mmvar' as normalized values.
   *
   *   avar_loaded ::
   *     A Boolean; if set, FreeType tried to load (and parse) the `avar'
   *     table.
   *
   *   avar_segment ::
   *     Data from the `avar' table.
   *
   *   hvar_loaded ::
   *     A Boolean; if set, FreeType tried to load (and parse) the `hvar'
   *     table.
   *
   *   hvar_checked ::
   *     A Boolean; if set, FreeType successfully loaded and parsed the
   *     `hvar' table.
   *
   *   hvar_error ::
   *     If loading and parsing of the `hvar' table failed, this field
   *     holds the corresponding error code.
   *
   *   hvar_table ::
   *     Data from the `hvar' table.
   *
   *   vvar_loaded ::
   *     A Boolean; if set, FreeType tried to load (and parse) the `vvar'
   *     table.
   *
   *   vvar_checked ::
   *     A Boolean; if set, FreeType successfully loaded and parsed the
   *     `vvar' table.
   *
   *   vvar_error ::
   *     If loading and parsing of the `vvar' table failed, this field
   *     holds the corresponding error code.
   *
   *   vvar_table ::
   *     Data from the `vvar' table.
   *
   *   mvar_table ::
   *     Data from the `mvar' table.
   *
   *   tuplecount ::
   *     The number of shared tuples in the `gvar' table.
   *
   *   tuplecoords ::
   *     A two-dimensional array that holds the shared tuple coordinates
   *     in the `gvar' table.
   *
   *   gv_glyphcnt ::
   *     The number of glyphs handled in the `gvar' table.
   *
   *   glyphoffsets ::
   *     Offsets into the glyph variation data array.
   *
   *   gvar_size ::
   *     The size of the `gvar' table.
   */
  typedef struct  GX_BlendRec_
  {
    FT_UInt         num_axis;
    FT_Fixed*       coords;
    FT_Fixed*       normalizedcoords;

    FT_MM_Var*      mmvar;
    FT_Offset       mmvar_len;

    FT_Fixed*       normalized_stylecoords;
                      /* normalized_stylecoords[num_namedstyles][num_axis] */

    FT_Bool         avar_loaded;
    GX_AVarSegment  avar_segment;                /* avar_segment[num_axis] */

    FT_Bool         hvar_loaded;
    FT_Bool         hvar_checked;
    FT_Error        hvar_error;
    GX_HVVarTable   hvar_table;

    FT_Bool         vvar_loaded;
    FT_Bool         vvar_checked;
    FT_Error        vvar_error;
    GX_HVVarTable   vvar_table;

    GX_MVarTable    mvar_table;

    FT_UInt         tuplecount;
    FT_Fixed*       tuplecoords;      /* tuplecoords[tuplecount][num_axis] */

    FT_UInt         gv_glyphcnt;
    FT_ULong*       glyphoffsets;         /* glyphoffsets[gv_glyphcnt + 1] */

    FT_ULong        gvar_size;

  } GX_BlendRec;


  /**************************************************************************
   *
   * @enum:
   *   GX_TupleCountFlags
   *
   * @Description:
   *   Flags used within the `TupleCount' field of the `gvar' table.
   */
  typedef enum  GX_TupleCountFlags_
  {
    GX_TC_TUPLES_SHARE_POINT_NUMBERS = 0x8000,
    GX_TC_RESERVED_TUPLE_FLAGS       = 0x7000,
    GX_TC_TUPLE_COUNT_MASK           = 0x0FFF

  } GX_TupleCountFlags;


  /**************************************************************************
   *
   * @enum:
   *   GX_TupleIndexFlags
   *
   * @Description:
   *   Flags used within the `TupleIndex' field of the `gvar' and `cvar'
   *   tables.
   */
  typedef enum  GX_TupleIndexFlags_
  {
    GX_TI_EMBEDDED_TUPLE_COORD  = 0x8000,
    GX_TI_INTERMEDIATE_TUPLE    = 0x4000,
    GX_TI_PRIVATE_POINT_NUMBERS = 0x2000,
    GX_TI_RESERVED_TUPLE_FLAG   = 0x1000,
    GX_TI_TUPLE_INDEX_MASK      = 0x0FFF

  } GX_TupleIndexFlags;


#define TTAG_wght  FT_MAKE_TAG( 'w', 'g', 'h', 't' )
#define TTAG_wdth  FT_MAKE_TAG( 'w', 'd', 't', 'h' )
#define TTAG_opsz  FT_MAKE_TAG( 'o', 'p', 's', 'z' )
#define TTAG_slnt  FT_MAKE_TAG( 's', 'l', 'n', 't' )


  FT_LOCAL( FT_Error )
  TT_Set_MM_Blend( TT_Face    face,
                   FT_UInt    num_coords,
                   FT_Fixed*  coords );

  FT_LOCAL( FT_Error )
  TT_Get_MM_Blend( TT_Face    face,
                   FT_UInt    num_coords,
                   FT_Fixed*  coords );

  FT_LOCAL( FT_Error )
  TT_Set_Var_Design( TT_Face    face,
                     FT_UInt    num_coords,
                     FT_Fixed*  coords );

  FT_LOCAL( FT_Error )
  TT_Get_MM_Var( TT_Face      face,
                 FT_MM_Var*  *master );

  FT_LOCAL( FT_Error )
  TT_Get_Var_Design( TT_Face    face,
                     FT_UInt    num_coords,
                     FT_Fixed*  coords );

  FT_LOCAL( FT_Error )
  TT_Set_Named_Instance( TT_Face  face,
                         FT_UInt  instance_index );

  FT_LOCAL( FT_Error )
  tt_face_vary_cvt( TT_Face    face,
                    FT_Stream  stream );


  FT_LOCAL( FT_Error )
  TT_Vary_Apply_Glyph_Deltas( TT_Face      face,
                              FT_UInt      glyph_index,
                              FT_Outline*  outline,
                              FT_Vector*   unrounded,
                              FT_UInt      n_points );

  FT_LOCAL( FT_Error )
  tt_hadvance_adjust( TT_Face  face,
                      FT_UInt  gindex,
                      FT_Int  *adelta );

  FT_LOCAL( FT_Error )
  tt_vadvance_adjust( TT_Face  face,
                      FT_UInt  gindex,
                      FT_Int  *adelta );

  FT_LOCAL( void )
  tt_apply_mvar( TT_Face  face );

  FT_LOCAL( FT_Error )
  tt_get_var_blend( TT_Face      face,
                    FT_UInt     *num_coords,
                    FT_Fixed*   *coords,
                    FT_Fixed*   *normalizedcoords,
                    FT_MM_Var*  *mm_var );

  FT_LOCAL( void )
  tt_done_blend( TT_Face  face );

#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */


FT_END_HEADER


#endif /* TTGXVAR_H_ */


/* END */