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Side by Side Diff: core/src/fxge/fx_freetype/fxft2.5.01/src/truetype/ttgxvar.c

Issue 815103002: Update freetype to 2.5.4. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Adjust GYP and GN Created 6 years ago
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1 /***************************************************************************/
2 /* */
3 /* ttgxvar.c */
4 /* */
5 /* TrueType GX Font Variation loader */
6 /* */
7 /* Copyright 2004-2013 by */
8 /* David Turner, Robert Wilhelm, Werner Lemberg, and George Williams. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 /*************************************************************************/
20 /* */
21 /* Apple documents the `fvar', `gvar', `cvar', and `avar' tables at */
22 /* */
23 /* http://developer.apple.com/fonts/TTRefMan/RM06/Chap6[fgca]var.html */
24 /* */
25 /* The documentation for `fvar' is inconsistent. At one point it says */
26 /* that `countSizePairs' should be 3, at another point 2. It should */
27 /* be 2. */
28 /* */
29 /* The documentation for `gvar' is not intelligible; `cvar' refers you */
30 /* to `gvar' and is thus also incomprehensible. */
31 /* */
32 /* The documentation for `avar' appears correct, but Apple has no fonts */
33 /* with an `avar' table, so it is hard to test. */
34 /* */
35 /* Many thanks to John Jenkins (at Apple) in figuring this out. */
36 /* */
37 /* */
38 /* Apple's `kern' table has some references to tuple indices, but as */
39 /* there is no indication where these indices are defined, nor how to */
40 /* interpolate the kerning values (different tuples have different */
41 /* classes) this issue is ignored. */
42 /* */
43 /*************************************************************************/
44
45
46 #include "../../include/ft2build.h"
47 #include "../../include/freetype/internal/ftdebug.h"
48 #include "../../include/freetype/config/ftconfig.h"
49 #include "../../include/freetype/internal/ftstream.h"
50 #include "../../include/freetype/internal/sfnt.h"
51 #include "../../include/freetype/tttags.h"
52 #include "../../include/freetype/ftmm.h"
53
54 #include "ttpload.h"
55 #include "ttgxvar.h"
56
57 #include "tterrors.h"
58
59
60 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
61
62
63 #define FT_Stream_FTell( stream ) \
64 (FT_ULong)( (stream)->cursor - (stream)->base )
65 #define FT_Stream_SeekSet( stream, off ) \
66 ( (stream)->cursor = (stream)->base + (off) )
67
68
69 /*************************************************************************/
70 /* */
71 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
72 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
73 /* messages during execution. */
74 /* */
75 #undef FT_COMPONENT
76 #define FT_COMPONENT trace_ttgxvar
77
78
79 /*************************************************************************/
80 /*************************************************************************/
81 /***** *****/
82 /***** Internal Routines *****/
83 /***** *****/
84 /*************************************************************************/
85 /*************************************************************************/
86
87
88 /*************************************************************************/
89 /* */
90 /* The macro ALL_POINTS is used in `ft_var_readpackedpoints'. It */
91 /* indicates that there is a delta for every point without needing to */
92 /* enumerate all of them. */
93 /* */
94
95 /* ensure that value `0' has the same width as a pointer */
96 #define ALL_POINTS (FT_UShort*)~(FT_PtrDist)0
97
98
99 #define GX_PT_POINTS_ARE_WORDS 0x80
100 #define GX_PT_POINT_RUN_COUNT_MASK 0x7F
101
102
103 /*************************************************************************/
104 /* */
105 /* <Function> */
106 /* ft_var_readpackedpoints */
107 /* */
108 /* <Description> */
109 /* Read a set of points to which the following deltas will apply. */
110 /* Points are packed with a run length encoding. */
111 /* */
112 /* <Input> */
113 /* stream :: The data stream. */
114 /* */
115 /* <Output> */
116 /* point_cnt :: The number of points read. A zero value means that */
117 /* all points in the glyph will be affected, without */
118 /* enumerating them individually. */
119 /* */
120 /* <Return> */
121 /* An array of FT_UShort containing the affected points or the */
122 /* special value ALL_POINTS. */
123 /* */
124 static FT_UShort*
125 ft_var_readpackedpoints( FT_Stream stream,
126 FT_UInt *point_cnt )
127 {
128 FT_UShort *points = NULL;
129 FT_Int n;
130 FT_Int runcnt;
131 FT_Int i;
132 FT_Int j;
133 FT_Int first;
134 FT_Memory memory = stream->memory;
135 FT_Error error = FT_Err_Ok;
136
137 FT_UNUSED( error );
138
139
140 *point_cnt = n = FT_GET_BYTE();
141 if ( n == 0 )
142 return ALL_POINTS;
143
144 if ( n & GX_PT_POINTS_ARE_WORDS )
145 n = FT_GET_BYTE() | ( ( n & GX_PT_POINT_RUN_COUNT_MASK ) << 8 );
146
147 if ( FT_NEW_ARRAY( points, n ) )
148 return NULL;
149
150 i = 0;
151 while ( i < n )
152 {
153 runcnt = FT_GET_BYTE();
154 if ( runcnt & GX_PT_POINTS_ARE_WORDS )
155 {
156 runcnt = runcnt & GX_PT_POINT_RUN_COUNT_MASK;
157 first = points[i++] = FT_GET_USHORT();
158
159 if ( runcnt < 1 || i + runcnt >= n )
160 goto Exit;
161
162 /* first point not included in runcount */
163 for ( j = 0; j < runcnt; ++j )
164 points[i++] = (FT_UShort)( first += FT_GET_USHORT() );
165 }
166 else
167 {
168 first = points[i++] = FT_GET_BYTE();
169
170 if ( runcnt < 1 || i + runcnt >= n )
171 goto Exit;
172
173 for ( j = 0; j < runcnt; ++j )
174 points[i++] = (FT_UShort)( first += FT_GET_BYTE() );
175 }
176 }
177
178 Exit:
179 return points;
180 }
181
182
183 enum
184 {
185 GX_DT_DELTAS_ARE_ZERO = 0x80,
186 GX_DT_DELTAS_ARE_WORDS = 0x40,
187 GX_DT_DELTA_RUN_COUNT_MASK = 0x3F
188 };
189
190
191 /*************************************************************************/
192 /* */
193 /* <Function> */
194 /* ft_var_readpackeddeltas */
195 /* */
196 /* <Description> */
197 /* Read a set of deltas. These are packed slightly differently than */
198 /* points. In particular there is no overall count. */
199 /* */
200 /* <Input> */
201 /* stream :: The data stream. */
202 /* */
203 /* delta_cnt :: The number of to be read. */
204 /* */
205 /* <Return> */
206 /* An array of FT_Short containing the deltas for the affected */
207 /* points. (This only gets the deltas for one dimension. It will */
208 /* generally be called twice, once for x, once for y. When used in */
209 /* cvt table, it will only be called once.) */
210 /* */
211 static FT_Short*
212 ft_var_readpackeddeltas( FT_Stream stream,
213 FT_Offset delta_cnt )
214 {
215 FT_Short *deltas = NULL;
216 FT_UInt runcnt;
217 FT_Offset i;
218 FT_UInt j;
219 FT_Memory memory = stream->memory;
220 FT_Error error = FT_Err_Ok;
221
222 FT_UNUSED( error );
223
224
225 if ( FT_NEW_ARRAY( deltas, delta_cnt ) )
226 return NULL;
227
228 i = 0;
229 while ( i < delta_cnt )
230 {
231 runcnt = FT_GET_BYTE();
232 if ( runcnt & GX_DT_DELTAS_ARE_ZERO )
233 {
234 /* runcnt zeroes get added */
235 for ( j = 0;
236 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
237 ++j )
238 deltas[i++] = 0;
239 }
240 else if ( runcnt & GX_DT_DELTAS_ARE_WORDS )
241 {
242 /* runcnt shorts from the stack */
243 for ( j = 0;
244 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
245 ++j )
246 deltas[i++] = FT_GET_SHORT();
247 }
248 else
249 {
250 /* runcnt signed bytes from the stack */
251 for ( j = 0;
252 j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) && i < delta_cnt;
253 ++j )
254 deltas[i++] = FT_GET_CHAR();
255 }
256
257 if ( j <= ( runcnt & GX_DT_DELTA_RUN_COUNT_MASK ) )
258 {
259 /* Bad format */
260 FT_FREE( deltas );
261 return NULL;
262 }
263 }
264
265 return deltas;
266 }
267
268
269 /*************************************************************************/
270 /* */
271 /* <Function> */
272 /* ft_var_load_avar */
273 /* */
274 /* <Description> */
275 /* Parse the `avar' table if present. It need not be, so we return */
276 /* nothing. */
277 /* */
278 /* <InOut> */
279 /* face :: The font face. */
280 /* */
281 static void
282 ft_var_load_avar( TT_Face face )
283 {
284 FT_Stream stream = FT_FACE_STREAM(face);
285 FT_Memory memory = stream->memory;
286 GX_Blend blend = face->blend;
287 GX_AVarSegment segment;
288 FT_Error error = FT_Err_Ok;
289 FT_ULong version;
290 FT_Long axisCount;
291 FT_Int i, j;
292 FT_ULong table_len;
293
294 FT_UNUSED( error );
295
296
297 blend->avar_checked = TRUE;
298 if ( (error = face->goto_table( face, TTAG_avar, stream, &table_len )) != 0 )
299 return;
300
301 if ( FT_FRAME_ENTER( table_len ) )
302 return;
303
304 version = FT_GET_LONG();
305 axisCount = FT_GET_LONG();
306
307 if ( version != 0x00010000L ||
308 axisCount != (FT_Long)blend->mmvar->num_axis )
309 goto Exit;
310
311 if ( FT_NEW_ARRAY( blend->avar_segment, axisCount ) )
312 goto Exit;
313
314 segment = &blend->avar_segment[0];
315 for ( i = 0; i < axisCount; ++i, ++segment )
316 {
317 segment->pairCount = FT_GET_USHORT();
318 if ( FT_NEW_ARRAY( segment->correspondence, segment->pairCount ) )
319 {
320 /* Failure. Free everything we have done so far. We must do */
321 /* it right now since loading the `avar' table is optional. */
322
323 for ( j = i - 1; j >= 0; --j )
324 FT_FREE( blend->avar_segment[j].correspondence );
325
326 FT_FREE( blend->avar_segment );
327 blend->avar_segment = NULL;
328 goto Exit;
329 }
330
331 for ( j = 0; j < segment->pairCount; ++j )
332 {
333 segment->correspondence[j].fromCoord =
334 FT_GET_SHORT() << 2; /* convert to Fixed */
335 segment->correspondence[j].toCoord =
336 FT_GET_SHORT()<<2; /* convert to Fixed */
337 }
338 }
339
340 Exit:
341 FT_FRAME_EXIT();
342 }
343
344
345 typedef struct GX_GVar_Head_
346 {
347 FT_Long version;
348 FT_UShort axisCount;
349 FT_UShort globalCoordCount;
350 FT_ULong offsetToCoord;
351 FT_UShort glyphCount;
352 FT_UShort flags;
353 FT_ULong offsetToData;
354
355 } GX_GVar_Head;
356
357
358 /*************************************************************************/
359 /* */
360 /* <Function> */
361 /* ft_var_load_gvar */
362 /* */
363 /* <Description> */
364 /* Parses the `gvar' table if present. If `fvar' is there, `gvar' */
365 /* had better be there too. */
366 /* */
367 /* <InOut> */
368 /* face :: The font face. */
369 /* */
370 /* <Return> */
371 /* FreeType error code. 0 means success. */
372 /* */
373 static FT_Error
374 ft_var_load_gvar( TT_Face face )
375 {
376 FT_Stream stream = FT_FACE_STREAM(face);
377 FT_Memory memory = stream->memory;
378 GX_Blend blend = face->blend;
379 FT_Error error;
380 FT_UInt i, j;
381 FT_ULong table_len;
382 FT_ULong gvar_start;
383 FT_ULong offsetToData;
384 GX_GVar_Head gvar_head;
385
386 static const FT_Frame_Field gvar_fields[] =
387 {
388
389 #undef FT_STRUCTURE
390 #define FT_STRUCTURE GX_GVar_Head
391
392 FT_FRAME_START( 20 ),
393 FT_FRAME_LONG ( version ),
394 FT_FRAME_USHORT( axisCount ),
395 FT_FRAME_USHORT( globalCoordCount ),
396 FT_FRAME_ULONG ( offsetToCoord ),
397 FT_FRAME_USHORT( glyphCount ),
398 FT_FRAME_USHORT( flags ),
399 FT_FRAME_ULONG ( offsetToData ),
400 FT_FRAME_END
401 };
402
403 if ( (error = face->goto_table( face, TTAG_gvar, stream, &table_len )) != 0 )
404 goto Exit;
405
406 gvar_start = FT_STREAM_POS( );
407 if ( FT_STREAM_READ_FIELDS( gvar_fields, &gvar_head ) )
408 goto Exit;
409
410 blend->tuplecount = gvar_head.globalCoordCount;
411 blend->gv_glyphcnt = gvar_head.glyphCount;
412 offsetToData = gvar_start + gvar_head.offsetToData;
413
414 if ( gvar_head.version != (FT_Long)0x00010000L ||
415 gvar_head.axisCount != (FT_UShort)blend->mmvar->num_axis )
416 {
417 error = FT_THROW( Invalid_Table );
418 goto Exit;
419 }
420
421 if ( FT_NEW_ARRAY( blend->glyphoffsets, blend->gv_glyphcnt + 1 ) )
422 goto Exit;
423
424 if ( gvar_head.flags & 1 )
425 {
426 /* long offsets (one more offset than glyphs, to mark size of last) */
427 if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 4L ) )
428 goto Exit;
429
430 for ( i = 0; i <= blend->gv_glyphcnt; ++i )
431 blend->glyphoffsets[i] = offsetToData + FT_GET_LONG();
432
433 FT_FRAME_EXIT();
434 }
435 else
436 {
437 /* short offsets (one more offset than glyphs, to mark size of last) */
438 if ( FT_FRAME_ENTER( ( blend->gv_glyphcnt + 1 ) * 2L ) )
439 goto Exit;
440
441 for ( i = 0; i <= blend->gv_glyphcnt; ++i )
442 blend->glyphoffsets[i] = offsetToData + FT_GET_USHORT() * 2;
443 /* XXX: Undocumented: `*2'! */
444
445 FT_FRAME_EXIT();
446 }
447
448 if ( blend->tuplecount != 0 )
449 {
450 if ( FT_NEW_ARRAY( blend->tuplecoords,
451 gvar_head.axisCount * blend->tuplecount ) )
452 goto Exit;
453
454 if ( FT_STREAM_SEEK( gvar_start + gvar_head.offsetToCoord ) ||
455 FT_FRAME_ENTER( blend->tuplecount * gvar_head.axisCount * 2L ) )
456 goto Exit;
457
458 for ( i = 0; i < blend->tuplecount; ++i )
459 for ( j = 0 ; j < (FT_UInt)gvar_head.axisCount; ++j )
460 blend->tuplecoords[i * gvar_head.axisCount + j] =
461 FT_GET_SHORT() << 2; /* convert to FT_Fixed */
462
463 FT_FRAME_EXIT();
464 }
465
466 Exit:
467 return error;
468 }
469
470
471 /*************************************************************************/
472 /* */
473 /* <Function> */
474 /* ft_var_apply_tuple */
475 /* */
476 /* <Description> */
477 /* Figure out whether a given tuple (design) applies to the current */
478 /* blend, and if so, what is the scaling factor. */
479 /* */
480 /* <Input> */
481 /* blend :: The current blend of the font. */
482 /* */
483 /* tupleIndex :: A flag saying whether this is an intermediate */
484 /* tuple or not. */
485 /* */
486 /* tuple_coords :: The coordinates of the tuple in normalized axis */
487 /* units. */
488 /* */
489 /* im_start_coords :: The initial coordinates where this tuple starts */
490 /* to apply (for intermediate coordinates). */
491 /* */
492 /* im_end_coords :: The final coordinates after which this tuple no */
493 /* longer applies (for intermediate coordinates). */
494 /* */
495 /* <Return> */
496 /* An FT_Fixed value containing the scaling factor. */
497 /* */
498 static FT_Fixed
499 ft_var_apply_tuple( GX_Blend blend,
500 FT_UShort tupleIndex,
501 FT_Fixed* tuple_coords,
502 FT_Fixed* im_start_coords,
503 FT_Fixed* im_end_coords )
504 {
505 FT_UInt i;
506 FT_Fixed apply = 0x10000L;
507
508
509 for ( i = 0; i < blend->num_axis; ++i )
510 {
511 if ( tuple_coords[i] == 0 )
512 /* It's not clear why (for intermediate tuples) we don't need */
513 /* to check against start/end -- the documentation says we don't. */
514 /* Similarly, it's unclear why we don't need to scale along the */
515 /* axis. */
516 continue;
517
518 else if ( blend->normalizedcoords[i] == 0 ||
519 ( blend->normalizedcoords[i] < 0 && tuple_coords[i] > 0 ) ||
520 ( blend->normalizedcoords[i] > 0 && tuple_coords[i] < 0 ) )
521 {
522 apply = 0;
523 break;
524 }
525
526 else if ( !( tupleIndex & GX_TI_INTERMEDIATE_TUPLE ) )
527 /* not an intermediate tuple */
528 apply = FT_MulFix( apply,
529 blend->normalizedcoords[i] > 0
530 ? blend->normalizedcoords[i]
531 : -blend->normalizedcoords[i] );
532
533 else if ( blend->normalizedcoords[i] <= im_start_coords[i] ||
534 blend->normalizedcoords[i] >= im_end_coords[i] )
535 {
536 apply = 0;
537 break;
538 }
539
540 else if ( blend->normalizedcoords[i] < tuple_coords[i] )
541 apply = FT_MulDiv( apply,
542 blend->normalizedcoords[i] - im_start_coords[i],
543 tuple_coords[i] - im_start_coords[i] );
544
545 else
546 apply = FT_MulDiv( apply,
547 im_end_coords[i] - blend->normalizedcoords[i],
548 im_end_coords[i] - tuple_coords[i] );
549 }
550
551 return apply;
552 }
553
554
555 /*************************************************************************/
556 /*************************************************************************/
557 /***** *****/
558 /***** MULTIPLE MASTERS SERVICE FUNCTIONS *****/
559 /***** *****/
560 /*************************************************************************/
561 /*************************************************************************/
562
563
564 typedef struct GX_FVar_Head_
565 {
566 FT_Long version;
567 FT_UShort offsetToData;
568 FT_UShort countSizePairs;
569 FT_UShort axisCount;
570 FT_UShort axisSize;
571 FT_UShort instanceCount;
572 FT_UShort instanceSize;
573
574 } GX_FVar_Head;
575
576
577 typedef struct fvar_axis_
578 {
579 FT_ULong axisTag;
580 FT_ULong minValue;
581 FT_ULong defaultValue;
582 FT_ULong maxValue;
583 FT_UShort flags;
584 FT_UShort nameID;
585
586 } GX_FVar_Axis;
587
588
589 /*************************************************************************/
590 /* */
591 /* <Function> */
592 /* TT_Get_MM_Var */
593 /* */
594 /* <Description> */
595 /* Check that the font's `fvar' table is valid, parse it, and return */
596 /* those data. */
597 /* */
598 /* <InOut> */
599 /* face :: The font face. */
600 /* TT_Get_MM_Var initializes the blend structure. */
601 /* */
602 /* <Output> */
603 /* master :: The `fvar' data (must be freed by caller). */
604 /* */
605 /* <Return> */
606 /* FreeType error code. 0 means success. */
607 /* */
608 FT_LOCAL_DEF( FT_Error )
609 TT_Get_MM_Var( TT_Face face,
610 FT_MM_Var* *master )
611 {
612 FT_Stream stream = face->root.stream;
613 FT_Memory memory = face->root.memory;
614 FT_ULong table_len;
615 FT_Error error = FT_Err_Ok;
616 FT_ULong fvar_start;
617 FT_Int i, j;
618 FT_MM_Var* mmvar = NULL;
619 FT_Fixed* next_coords;
620 FT_String* next_name;
621 FT_Var_Axis* a;
622 FT_Var_Named_Style* ns;
623 GX_FVar_Head fvar_head;
624
625 static const FT_Frame_Field fvar_fields[] =
626 {
627
628 #undef FT_STRUCTURE
629 #define FT_STRUCTURE GX_FVar_Head
630
631 FT_FRAME_START( 16 ),
632 FT_FRAME_LONG ( version ),
633 FT_FRAME_USHORT( offsetToData ),
634 FT_FRAME_USHORT( countSizePairs ),
635 FT_FRAME_USHORT( axisCount ),
636 FT_FRAME_USHORT( axisSize ),
637 FT_FRAME_USHORT( instanceCount ),
638 FT_FRAME_USHORT( instanceSize ),
639 FT_FRAME_END
640 };
641
642 static const FT_Frame_Field fvaraxis_fields[] =
643 {
644
645 #undef FT_STRUCTURE
646 #define FT_STRUCTURE GX_FVar_Axis
647
648 FT_FRAME_START( 20 ),
649 FT_FRAME_ULONG ( axisTag ),
650 FT_FRAME_ULONG ( minValue ),
651 FT_FRAME_ULONG ( defaultValue ),
652 FT_FRAME_ULONG ( maxValue ),
653 FT_FRAME_USHORT( flags ),
654 FT_FRAME_USHORT( nameID ),
655 FT_FRAME_END
656 };
657
658
659 if ( face->blend == NULL )
660 {
661 /* both `fvar' and `gvar' must be present */
662 if ( (error = face->goto_table( face, TTAG_gvar,
663 stream, &table_len )) != 0 )
664 goto Exit;
665
666 if ( (error = face->goto_table( face, TTAG_fvar,
667 stream, &table_len )) != 0 )
668 goto Exit;
669
670 fvar_start = FT_STREAM_POS( );
671
672 if ( FT_STREAM_READ_FIELDS( fvar_fields, &fvar_head ) )
673 goto Exit;
674
675 if ( fvar_head.version != (FT_Long)0x00010000L ||
676 fvar_head.countSizePairs != 2 ||
677 fvar_head.axisSize != 20 ||
678 /* axisCount limit implied by 16-bit instanceSize */
679 fvar_head.axisCount > 0x3FFE ||
680 fvar_head.instanceSize != 4 + 4 * fvar_head.axisCount ||
681 /* instanceCount limit implied by limited range of name IDs */
682 fvar_head.instanceCount > 0x7EFF ||
683 fvar_head.offsetToData + fvar_head.axisCount * 20U +
684 fvar_head.instanceCount * fvar_head.instanceSize > table_len )
685 {
686 error = FT_THROW( Invalid_Table );
687 goto Exit;
688 }
689
690 if ( FT_NEW( face->blend ) )
691 goto Exit;
692
693 /* cannot overflow 32-bit arithmetic because of limits above */
694 face->blend->mmvar_len =
695 sizeof ( FT_MM_Var ) +
696 fvar_head.axisCount * sizeof ( FT_Var_Axis ) +
697 fvar_head.instanceCount * sizeof ( FT_Var_Named_Style ) +
698 fvar_head.instanceCount * fvar_head.axisCount * sizeof ( FT_Fixed ) +
699 5 * fvar_head.axisCount;
700
701 if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
702 goto Exit;
703 face->blend->mmvar = mmvar;
704
705 mmvar->num_axis =
706 fvar_head.axisCount;
707 mmvar->num_designs =
708 ~0U; /* meaningless in this context; each glyph */
709 /* may have a different number of designs */
710 /* (or tuples, as called by Apple) */
711 mmvar->num_namedstyles =
712 fvar_head.instanceCount;
713 mmvar->axis =
714 (FT_Var_Axis*)&(mmvar[1]);
715 mmvar->namedstyle =
716 (FT_Var_Named_Style*)&(mmvar->axis[fvar_head.axisCount]);
717
718 next_coords =
719 (FT_Fixed*)&(mmvar->namedstyle[fvar_head.instanceCount]);
720 for ( i = 0; i < fvar_head.instanceCount; ++i )
721 {
722 mmvar->namedstyle[i].coords = next_coords;
723 next_coords += fvar_head.axisCount;
724 }
725
726 next_name = (FT_String*)next_coords;
727 for ( i = 0; i < fvar_head.axisCount; ++i )
728 {
729 mmvar->axis[i].name = next_name;
730 next_name += 5;
731 }
732
733 if ( FT_STREAM_SEEK( fvar_start + fvar_head.offsetToData ) )
734 goto Exit;
735
736 a = mmvar->axis;
737 for ( i = 0; i < fvar_head.axisCount; ++i )
738 {
739 GX_FVar_Axis axis_rec;
740
741
742 if ( FT_STREAM_READ_FIELDS( fvaraxis_fields, &axis_rec ) )
743 goto Exit;
744 a->tag = axis_rec.axisTag;
745 a->minimum = axis_rec.minValue; /* A Fixed */
746 a->def = axis_rec.defaultValue; /* A Fixed */
747 a->maximum = axis_rec.maxValue; /* A Fixed */
748 a->strid = axis_rec.nameID;
749
750 a->name[0] = (FT_String)( a->tag >> 24 );
751 a->name[1] = (FT_String)( ( a->tag >> 16 ) & 0xFF );
752 a->name[2] = (FT_String)( ( a->tag >> 8 ) & 0xFF );
753 a->name[3] = (FT_String)( ( a->tag ) & 0xFF );
754 a->name[4] = 0;
755
756 ++a;
757 }
758
759 ns = mmvar->namedstyle;
760 for ( i = 0; i < fvar_head.instanceCount; ++i, ++ns )
761 {
762 if ( FT_FRAME_ENTER( 4L + 4L * fvar_head.axisCount ) )
763 goto Exit;
764
765 ns->strid = FT_GET_USHORT();
766 (void) /* flags = */ FT_GET_USHORT();
767
768 for ( j = 0; j < fvar_head.axisCount; ++j )
769 ns->coords[j] = FT_GET_ULONG(); /* A Fixed */
770
771 FT_FRAME_EXIT();
772 }
773 }
774
775 if ( master != NULL )
776 {
777 FT_UInt n;
778
779
780 if ( FT_ALLOC( mmvar, face->blend->mmvar_len ) )
781 goto Exit;
782 FT_MEM_COPY( mmvar, face->blend->mmvar, face->blend->mmvar_len );
783
784 mmvar->axis =
785 (FT_Var_Axis*)&(mmvar[1]);
786 mmvar->namedstyle =
787 (FT_Var_Named_Style*)&(mmvar->axis[mmvar->num_axis]);
788 next_coords =
789 (FT_Fixed*)&(mmvar->namedstyle[mmvar->num_namedstyles]);
790
791 for ( n = 0; n < mmvar->num_namedstyles; ++n )
792 {
793 mmvar->namedstyle[n].coords = next_coords;
794 next_coords += mmvar->num_axis;
795 }
796
797 a = mmvar->axis;
798 next_name = (FT_String*)next_coords;
799 for ( n = 0; n < mmvar->num_axis; ++n )
800 {
801 a->name = next_name;
802
803 /* standard PostScript names for some standard apple tags */
804 if ( a->tag == TTAG_wght )
805 a->name = (char *)"Weight";
806 else if ( a->tag == TTAG_wdth )
807 a->name = (char *)"Width";
808 else if ( a->tag == TTAG_opsz )
809 a->name = (char *)"OpticalSize";
810 else if ( a->tag == TTAG_slnt )
811 a->name = (char *)"Slant";
812
813 next_name += 5;
814 ++a;
815 }
816
817 *master = mmvar;
818 }
819
820 Exit:
821 return error;
822 }
823
824
825 /*************************************************************************/
826 /* */
827 /* <Function> */
828 /* TT_Set_MM_Blend */
829 /* */
830 /* <Description> */
831 /* Set the blend (normalized) coordinates for this instance of the */
832 /* font. Check that the `gvar' table is reasonable and does some */
833 /* initial preparation. */
834 /* */
835 /* <InOut> */
836 /* face :: The font. */
837 /* Initialize the blend structure with `gvar' data. */
838 /* */
839 /* <Input> */
840 /* num_coords :: Must be the axis count of the font. */
841 /* */
842 /* coords :: An array of num_coords, each between [-1,1]. */
843 /* */
844 /* <Return> */
845 /* FreeType error code. 0 means success. */
846 /* */
847 FT_LOCAL_DEF( FT_Error )
848 TT_Set_MM_Blend( TT_Face face,
849 FT_UInt num_coords,
850 FT_Fixed* coords )
851 {
852 FT_Error error = FT_Err_Ok;
853 GX_Blend blend;
854 FT_MM_Var* mmvar;
855 FT_UInt i;
856 FT_Memory memory = face->root.memory;
857
858 enum
859 {
860 mcvt_retain,
861 mcvt_modify,
862 mcvt_load
863
864 } manageCvt;
865
866
867 face->doblend = FALSE;
868
869 if ( face->blend == NULL )
870 {
871 if ( (error = TT_Get_MM_Var( face, NULL)) != 0 )
872 goto Exit;
873 }
874
875 blend = face->blend;
876 mmvar = blend->mmvar;
877
878 if ( num_coords != mmvar->num_axis )
879 {
880 error = FT_THROW( Invalid_Argument );
881 goto Exit;
882 }
883
884 for ( i = 0; i < num_coords; ++i )
885 if ( coords[i] < -0x00010000L || coords[i] > 0x00010000L )
886 {
887 error = FT_THROW( Invalid_Argument );
888 goto Exit;
889 }
890
891 if ( blend->glyphoffsets == NULL )
892 if ( (error = ft_var_load_gvar( face )) != 0 )
893 goto Exit;
894
895 if ( blend->normalizedcoords == NULL )
896 {
897 if ( FT_NEW_ARRAY( blend->normalizedcoords, num_coords ) )
898 goto Exit;
899
900 manageCvt = mcvt_modify;
901
902 /* If we have not set the blend coordinates before this, then the */
903 /* cvt table will still be what we read from the `cvt ' table and */
904 /* we don't need to reload it. We may need to change it though... */
905 }
906 else
907 {
908 manageCvt = mcvt_retain;
909 for ( i = 0; i < num_coords; ++i )
910 {
911 if ( blend->normalizedcoords[i] != coords[i] )
912 {
913 manageCvt = mcvt_load;
914 break;
915 }
916 }
917
918 /* If we don't change the blend coords then we don't need to do */
919 /* anything to the cvt table. It will be correct. Otherwise we */
920 /* no longer have the original cvt (it was modified when we set */
921 /* the blend last time), so we must reload and then modify it. */
922 }
923
924 blend->num_axis = num_coords;
925 FT_MEM_COPY( blend->normalizedcoords,
926 coords,
927 num_coords * sizeof ( FT_Fixed ) );
928
929 face->doblend = TRUE;
930
931 if ( face->cvt != NULL )
932 {
933 switch ( manageCvt )
934 {
935 case mcvt_load:
936 /* The cvt table has been loaded already; every time we change the */
937 /* blend we may need to reload and remodify the cvt table. */
938 FT_FREE( face->cvt );
939 face->cvt = NULL;
940
941 tt_face_load_cvt( face, face->root.stream );
942 break;
943
944 case mcvt_modify:
945 /* The original cvt table is in memory. All we need to do is */
946 /* apply the `cvar' table (if any). */
947 tt_face_vary_cvt( face, face->root.stream );
948 break;
949
950 case mcvt_retain:
951 /* The cvt table is correct for this set of coordinates. */
952 break;
953 }
954 }
955
956 Exit:
957 return error;
958 }
959
960
961 /*************************************************************************/
962 /* */
963 /* <Function> */
964 /* TT_Set_Var_Design */
965 /* */
966 /* <Description> */
967 /* Set the coordinates for the instance, measured in the user */
968 /* coordinate system. Parse the `avar' table (if present) to convert */
969 /* from user to normalized coordinates. */
970 /* */
971 /* <InOut> */
972 /* face :: The font face. */
973 /* Initialize the blend struct with `gvar' data. */
974 /* */
975 /* <Input> */
976 /* num_coords :: This must be the axis count of the font. */
977 /* */
978 /* coords :: A coordinate array with `num_coords' elements. */
979 /* */
980 /* <Return> */
981 /* FreeType error code. 0 means success. */
982 /* */
983 FT_LOCAL_DEF( FT_Error )
984 TT_Set_Var_Design( TT_Face face,
985 FT_UInt num_coords,
986 FT_Fixed* coords )
987 {
988 FT_Error error = FT_Err_Ok;
989 FT_Fixed* normalized = NULL;
990 GX_Blend blend;
991 FT_MM_Var* mmvar;
992 FT_UInt i, j;
993 FT_Var_Axis* a;
994 GX_AVarSegment av;
995 FT_Memory memory = face->root.memory;
996
997
998 if ( face->blend == NULL )
999 {
1000 if ( (error = TT_Get_MM_Var( face, NULL )) != 0 )
1001 goto Exit;
1002 }
1003
1004 blend = face->blend;
1005 mmvar = blend->mmvar;
1006
1007 if ( num_coords != mmvar->num_axis )
1008 {
1009 error = FT_THROW( Invalid_Argument );
1010 goto Exit;
1011 }
1012
1013 /* Axis normalization is a two stage process. First we normalize */
1014 /* based on the [min,def,max] values for the axis to be [-1,0,1]. */
1015 /* Then, if there's an `avar' table, we renormalize this range. */
1016
1017 if ( FT_NEW_ARRAY( normalized, mmvar->num_axis ) )
1018 goto Exit;
1019
1020 a = mmvar->axis;
1021 for ( i = 0; i < mmvar->num_axis; ++i, ++a )
1022 {
1023 if ( coords[i] > a->maximum || coords[i] < a->minimum )
1024 {
1025 error = FT_THROW( Invalid_Argument );
1026 goto Exit;
1027 }
1028
1029 if ( coords[i] < a->def )
1030 normalized[i] = -FT_DivFix( coords[i] - a->def, a->minimum - a->def );
1031 else if ( a->maximum == a->def )
1032 normalized[i] = 0;
1033 else
1034 normalized[i] = FT_DivFix( coords[i] - a->def, a->maximum - a->def );
1035 }
1036
1037 if ( !blend->avar_checked )
1038 ft_var_load_avar( face );
1039
1040 if ( blend->avar_segment != NULL )
1041 {
1042 av = blend->avar_segment;
1043 for ( i = 0; i < mmvar->num_axis; ++i, ++av )
1044 {
1045 for ( j = 1; j < (FT_UInt)av->pairCount; ++j )
1046 if ( normalized[i] < av->correspondence[j].fromCoord )
1047 {
1048 normalized[i] =
1049 FT_MulDiv( normalized[i] - av->correspondence[j - 1].fromCoord,
1050 av->correspondence[j].toCoord -
1051 av->correspondence[j - 1].toCoord,
1052 av->correspondence[j].fromCoord -
1053 av->correspondence[j - 1].fromCoord ) +
1054 av->correspondence[j - 1].toCoord;
1055 break;
1056 }
1057 }
1058 }
1059
1060 error = TT_Set_MM_Blend( face, num_coords, normalized );
1061
1062 Exit:
1063 FT_FREE( normalized );
1064 return error;
1065 }
1066
1067
1068 /*************************************************************************/
1069 /*************************************************************************/
1070 /***** *****/
1071 /***** GX VAR PARSING ROUTINES *****/
1072 /***** *****/
1073 /*************************************************************************/
1074 /*************************************************************************/
1075
1076
1077 /*************************************************************************/
1078 /* */
1079 /* <Function> */
1080 /* tt_face_vary_cvt */
1081 /* */
1082 /* <Description> */
1083 /* Modify the loaded cvt table according to the `cvar' table and the */
1084 /* font's blend. */
1085 /* */
1086 /* <InOut> */
1087 /* face :: A handle to the target face object. */
1088 /* */
1089 /* <Input> */
1090 /* stream :: A handle to the input stream. */
1091 /* */
1092 /* <Return> */
1093 /* FreeType error code. 0 means success. */
1094 /* */
1095 /* Most errors are ignored. It is perfectly valid not to have a */
1096 /* `cvar' table even if there is a `gvar' and `fvar' table. */
1097 /* */
1098 FT_LOCAL_DEF( FT_Error )
1099 tt_face_vary_cvt( TT_Face face,
1100 FT_Stream stream )
1101 {
1102 FT_Error error;
1103 FT_Memory memory = stream->memory;
1104 FT_ULong table_start;
1105 FT_ULong table_len;
1106 FT_UInt tupleCount;
1107 FT_ULong offsetToData;
1108 FT_ULong here;
1109 FT_UInt i, j;
1110 FT_Fixed* tuple_coords = NULL;
1111 FT_Fixed* im_start_coords = NULL;
1112 FT_Fixed* im_end_coords = NULL;
1113 GX_Blend blend = face->blend;
1114 FT_UInt point_count;
1115 FT_UShort* localpoints;
1116 FT_Short* deltas;
1117
1118
1119 FT_TRACE2(( "CVAR " ));
1120
1121 if ( blend == NULL )
1122 {
1123 FT_TRACE2(( "tt_face_vary_cvt: no blend specified\n" ));
1124
1125 error = FT_Err_Ok;
1126 goto Exit;
1127 }
1128
1129 if ( face->cvt == NULL )
1130 {
1131 FT_TRACE2(( "tt_face_vary_cvt: no `cvt ' table\n" ));
1132
1133 error = FT_Err_Ok;
1134 goto Exit;
1135 }
1136
1137 error = face->goto_table( face, TTAG_cvar, stream, &table_len );
1138 if ( error )
1139 {
1140 FT_TRACE2(( "is missing\n" ));
1141
1142 error = FT_Err_Ok;
1143 goto Exit;
1144 }
1145
1146 if ( FT_FRAME_ENTER( table_len ) )
1147 {
1148 error = FT_Err_Ok;
1149 goto Exit;
1150 }
1151
1152 table_start = FT_Stream_FTell( stream );
1153 if ( FT_GET_LONG() != 0x00010000L )
1154 {
1155 FT_TRACE2(( "bad table version\n" ));
1156
1157 error = FT_Err_Ok;
1158 goto FExit;
1159 }
1160
1161 if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
1162 FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
1163 FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
1164 goto FExit;
1165
1166 tupleCount = FT_GET_USHORT();
1167 offsetToData = table_start + FT_GET_USHORT();
1168
1169 /* The documentation implies there are flags packed into the */
1170 /* tuplecount, but John Jenkins says that shared points don't apply */
1171 /* to `cvar', and no other flags are defined. */
1172
1173 for ( i = 0; i < ( tupleCount & 0xFFF ); ++i )
1174 {
1175 FT_UInt tupleDataSize;
1176 FT_UInt tupleIndex;
1177 FT_Fixed apply;
1178
1179
1180 tupleDataSize = FT_GET_USHORT();
1181 tupleIndex = FT_GET_USHORT();
1182
1183 /* There is no provision here for a global tuple coordinate section, */
1184 /* so John says. There are no tuple indices, just embedded tuples. */
1185
1186 if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
1187 {
1188 for ( j = 0; j < blend->num_axis; ++j )
1189 tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */
1190 /* short frac to fixed */
1191 }
1192 else
1193 {
1194 /* skip this tuple; it makes no sense */
1195
1196 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
1197 for ( j = 0; j < 2 * blend->num_axis; ++j )
1198 (void)FT_GET_SHORT();
1199
1200 offsetToData += tupleDataSize;
1201 continue;
1202 }
1203
1204 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
1205 {
1206 for ( j = 0; j < blend->num_axis; ++j )
1207 im_start_coords[j] = FT_GET_SHORT() << 2;
1208 for ( j = 0; j < blend->num_axis; ++j )
1209 im_end_coords[j] = FT_GET_SHORT() << 2;
1210 }
1211
1212 apply = ft_var_apply_tuple( blend,
1213 (FT_UShort)tupleIndex,
1214 tuple_coords,
1215 im_start_coords,
1216 im_end_coords );
1217 if ( /* tuple isn't active for our blend */
1218 apply == 0 ||
1219 /* global points not allowed, */
1220 /* if they aren't local, makes no sense */
1221 !( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS ) )
1222 {
1223 offsetToData += tupleDataSize;
1224 continue;
1225 }
1226
1227 here = FT_Stream_FTell( stream );
1228
1229 FT_Stream_SeekSet( stream, offsetToData );
1230
1231 localpoints = ft_var_readpackedpoints( stream, &point_count );
1232 deltas = ft_var_readpackeddeltas( stream,
1233 point_count == 0 ? face->cvt_size
1234 : point_count );
1235 if ( localpoints == NULL || deltas == NULL )
1236 /* failure, ignore it */;
1237
1238 else if ( localpoints == ALL_POINTS )
1239 {
1240 /* this means that there are deltas for every entry in cvt */
1241 for ( j = 0; j < face->cvt_size; ++j )
1242 face->cvt[j] = (FT_Short)( face->cvt[j] +
1243 FT_MulFix( deltas[j], apply ) );
1244 }
1245
1246 else
1247 {
1248 for ( j = 0; j < point_count; ++j )
1249 {
1250 int pindex = localpoints[j];
1251
1252 face->cvt[pindex] = (FT_Short)( face->cvt[pindex] +
1253 FT_MulFix( deltas[j], apply ) );
1254 }
1255 }
1256
1257 if ( localpoints != ALL_POINTS )
1258 FT_FREE( localpoints );
1259 FT_FREE( deltas );
1260
1261 offsetToData += tupleDataSize;
1262
1263 FT_Stream_SeekSet( stream, here );
1264 }
1265
1266 FExit:
1267 FT_FRAME_EXIT();
1268
1269 Exit:
1270 FT_FREE( tuple_coords );
1271 FT_FREE( im_start_coords );
1272 FT_FREE( im_end_coords );
1273
1274 return error;
1275 }
1276
1277
1278 /*************************************************************************/
1279 /* */
1280 /* <Function> */
1281 /* TT_Vary_Get_Glyph_Deltas */
1282 /* */
1283 /* <Description> */
1284 /* Load the appropriate deltas for the current glyph. */
1285 /* */
1286 /* <Input> */
1287 /* face :: A handle to the target face object. */
1288 /* */
1289 /* glyph_index :: The index of the glyph being modified. */
1290 /* */
1291 /* n_points :: The number of the points in the glyph, including */
1292 /* phantom points. */
1293 /* */
1294 /* <Output> */
1295 /* deltas :: The array of points to change. */
1296 /* */
1297 /* <Return> */
1298 /* FreeType error code. 0 means success. */
1299 /* */
1300 FT_LOCAL_DEF( FT_Error )
1301 TT_Vary_Get_Glyph_Deltas( TT_Face face,
1302 FT_UInt glyph_index,
1303 FT_Vector* *deltas,
1304 FT_UInt n_points )
1305 {
1306 FT_Stream stream = face->root.stream;
1307 FT_Memory memory = stream->memory;
1308 GX_Blend blend = face->blend;
1309 FT_Vector* delta_xy = NULL;
1310
1311 FT_Error error;
1312 FT_ULong glyph_start;
1313 FT_UInt tupleCount;
1314 FT_ULong offsetToData;
1315 FT_ULong here;
1316 FT_UInt i, j;
1317 FT_Fixed* tuple_coords = NULL;
1318 FT_Fixed* im_start_coords = NULL;
1319 FT_Fixed* im_end_coords = NULL;
1320 FT_UInt point_count, spoint_count = 0;
1321 FT_UShort* sharedpoints = NULL;
1322 FT_UShort* localpoints = NULL;
1323 FT_UShort* points;
1324 FT_Short *deltas_x, *deltas_y;
1325
1326
1327 if ( !face->doblend || blend == NULL )
1328 return FT_THROW( Invalid_Argument );
1329
1330 /* to be freed by the caller */
1331 if ( FT_NEW_ARRAY( delta_xy, n_points ) )
1332 goto Exit;
1333 *deltas = delta_xy;
1334
1335 if ( glyph_index >= blend->gv_glyphcnt ||
1336 blend->glyphoffsets[glyph_index] ==
1337 blend->glyphoffsets[glyph_index + 1] )
1338 return FT_Err_Ok; /* no variation data for this glyph */
1339
1340 if ( FT_STREAM_SEEK( blend->glyphoffsets[glyph_index] ) ||
1341 FT_FRAME_ENTER( blend->glyphoffsets[glyph_index + 1] -
1342 blend->glyphoffsets[glyph_index] ) )
1343 goto Fail1;
1344
1345 glyph_start = FT_Stream_FTell( stream );
1346
1347 /* each set of glyph variation data is formatted similarly to `cvar' */
1348 /* (except we get shared points and global tuples) */
1349
1350 if ( FT_NEW_ARRAY( tuple_coords, blend->num_axis ) ||
1351 FT_NEW_ARRAY( im_start_coords, blend->num_axis ) ||
1352 FT_NEW_ARRAY( im_end_coords, blend->num_axis ) )
1353 goto Fail2;
1354
1355 tupleCount = FT_GET_USHORT();
1356 offsetToData = glyph_start + FT_GET_USHORT();
1357
1358 if ( tupleCount & GX_TC_TUPLES_SHARE_POINT_NUMBERS )
1359 {
1360 here = FT_Stream_FTell( stream );
1361
1362 FT_Stream_SeekSet( stream, offsetToData );
1363
1364 sharedpoints = ft_var_readpackedpoints( stream, &spoint_count );
1365 offsetToData = FT_Stream_FTell( stream );
1366
1367 FT_Stream_SeekSet( stream, here );
1368 }
1369
1370 for ( i = 0; i < ( tupleCount & GX_TC_TUPLE_COUNT_MASK ); ++i )
1371 {
1372 FT_UInt tupleDataSize;
1373 FT_UInt tupleIndex;
1374 FT_Fixed apply;
1375
1376
1377 tupleDataSize = FT_GET_USHORT();
1378 tupleIndex = FT_GET_USHORT();
1379
1380 if ( tupleIndex & GX_TI_EMBEDDED_TUPLE_COORD )
1381 {
1382 for ( j = 0; j < blend->num_axis; ++j )
1383 tuple_coords[j] = FT_GET_SHORT() << 2; /* convert from */
1384 /* short frac to fixed */
1385 }
1386 else if ( ( tupleIndex & GX_TI_TUPLE_INDEX_MASK ) >= blend->tuplecount )
1387 {
1388 error = FT_THROW( Invalid_Table );
1389 goto Fail3;
1390 }
1391 else
1392 {
1393 FT_MEM_COPY(
1394 tuple_coords,
1395 &blend->tuplecoords[(tupleIndex & 0xFFF) * blend->num_axis],
1396 blend->num_axis * sizeof ( FT_Fixed ) );
1397 }
1398
1399 if ( tupleIndex & GX_TI_INTERMEDIATE_TUPLE )
1400 {
1401 for ( j = 0; j < blend->num_axis; ++j )
1402 im_start_coords[j] = FT_GET_SHORT() << 2;
1403 for ( j = 0; j < blend->num_axis; ++j )
1404 im_end_coords[j] = FT_GET_SHORT() << 2;
1405 }
1406
1407 apply = ft_var_apply_tuple( blend,
1408 (FT_UShort)tupleIndex,
1409 tuple_coords,
1410 im_start_coords,
1411 im_end_coords );
1412
1413 if ( apply == 0 ) /* tuple isn't active for our blend */
1414 {
1415 offsetToData += tupleDataSize;
1416 continue;
1417 }
1418
1419 here = FT_Stream_FTell( stream );
1420
1421 if ( tupleIndex & GX_TI_PRIVATE_POINT_NUMBERS )
1422 {
1423 FT_Stream_SeekSet( stream, offsetToData );
1424
1425 localpoints = ft_var_readpackedpoints( stream, &point_count );
1426 points = localpoints;
1427 }
1428 else
1429 {
1430 points = sharedpoints;
1431 point_count = spoint_count;
1432 }
1433
1434 deltas_x = ft_var_readpackeddeltas( stream,
1435 point_count == 0 ? n_points
1436 : point_count );
1437 deltas_y = ft_var_readpackeddeltas( stream,
1438 point_count == 0 ? n_points
1439 : point_count );
1440
1441 if ( points == NULL || deltas_y == NULL || deltas_x == NULL )
1442 ; /* failure, ignore it */
1443
1444 else if ( points == ALL_POINTS )
1445 {
1446 /* this means that there are deltas for every point in the glyph */
1447 for ( j = 0; j < n_points; ++j )
1448 {
1449 delta_xy[j].x += FT_MulFix( deltas_x[j], apply );
1450 delta_xy[j].y += FT_MulFix( deltas_y[j], apply );
1451 }
1452 }
1453
1454 else
1455 {
1456 for ( j = 0; j < point_count; ++j )
1457 {
1458 if ( localpoints[j] >= n_points )
1459 continue;
1460
1461 delta_xy[localpoints[j]].x += FT_MulFix( deltas_x[j], apply );
1462 delta_xy[localpoints[j]].y += FT_MulFix( deltas_y[j], apply );
1463 }
1464 }
1465
1466 if ( localpoints != ALL_POINTS )
1467 FT_FREE( localpoints );
1468 FT_FREE( deltas_x );
1469 FT_FREE( deltas_y );
1470
1471 offsetToData += tupleDataSize;
1472
1473 FT_Stream_SeekSet( stream, here );
1474 }
1475
1476 Fail3:
1477 FT_FREE( tuple_coords );
1478 FT_FREE( im_start_coords );
1479 FT_FREE( im_end_coords );
1480
1481 Fail2:
1482 FT_FRAME_EXIT();
1483
1484 Fail1:
1485 if ( error )
1486 {
1487 FT_FREE( delta_xy );
1488 *deltas = NULL;
1489 }
1490
1491 Exit:
1492 return error;
1493 }
1494
1495
1496 /*************************************************************************/
1497 /* */
1498 /* <Function> */
1499 /* tt_done_blend */
1500 /* */
1501 /* <Description> */
1502 /* Frees the blend internal data structure. */
1503 /* */
1504 FT_LOCAL_DEF( void )
1505 tt_done_blend( FT_Memory memory,
1506 GX_Blend blend )
1507 {
1508 if ( blend != NULL )
1509 {
1510 FT_UInt i;
1511
1512
1513 FT_FREE( blend->normalizedcoords );
1514 FT_FREE( blend->mmvar );
1515
1516 if ( blend->avar_segment != NULL )
1517 {
1518 for ( i = 0; i < blend->num_axis; ++i )
1519 FT_FREE( blend->avar_segment[i].correspondence );
1520 FT_FREE( blend->avar_segment );
1521 }
1522
1523 FT_FREE( blend->tuplecoords );
1524 FT_FREE( blend->glyphoffsets );
1525 FT_FREE( blend );
1526 }
1527 }
1528
1529 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1530
1531
1532 /* END */
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