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Revert "Merged all Chromoting Host code into remoting_core.dll (Windows)."
[chromium-blink-merge.git] / third_party / harfbuzz / src / harfbuzz-gpos.c
blobe969a0130985fcf29e279a150813c7dca1e8365c
1 /*
2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg
3 * Copyright (C) 2006 Behdad Esfahbod
4 * Copyright (C) 2007 Red Hat, Inc.
5 *
6 * This is part of HarfBuzz, an OpenType Layout engine library.
7 *
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
13 *
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * DAMAGE.
19 *
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 *
26 * Red Hat Author(s): Behdad Esfahbod
27 */
28
29 #include "harfbuzz-impl.h"
30 #include "harfbuzz-gpos-private.h"
31 #include "harfbuzz-open-private.h"
32 #include "harfbuzz-gdef-private.h"
33 #include "harfbuzz-shaper.h"
34
35 struct GPOS_Instance_
36 {
37 HB_GPOSHeader* gpos;
38 HB_Font font;
39 HB_Bool dvi;
40 HB_UShort load_flags; /* how the glyph should be loaded */
41 HB_Bool r2l;
42
43 HB_UShort last; /* the last valid glyph -- used
44 with cursive positioning */
45 HB_Fixed anchor_x; /* the coordinates of the anchor point */
46 HB_Fixed anchor_y; /* of the last valid glyph */
47 };
48
49 typedef struct GPOS_Instance_ GPOS_Instance;
50
51
52 static HB_Error GPOS_Do_Glyph_Lookup( GPOS_Instance* gpi,
53 HB_UShort lookup_index,
54 HB_Buffer buffer,
55 HB_UShort context_length,
56 int nesting_level );
57
58
59
60 #ifdef HB_SUPPORT_MULTIPLE_MASTER
61 /* the client application must replace this with something more
62 meaningful if multiple master fonts are to be supported. */
63
64 static HB_Error default_mmfunc( HB_Font font,
65 HB_UShort metric_id,
66 HB_Fixed* metric_value,
67 void* data )
68 {
69 HB_UNUSED(font);
70 HB_UNUSED(metric_id);
71 HB_UNUSED(metric_value);
72 HB_UNUSED(data);
73 return ERR(HB_Err_Not_Covered); /* ERR() call intended */
74 }
75 #endif
76
77
78
79 HB_Error HB_Load_GPOS_Table( HB_Stream stream,
80 HB_GPOSHeader** retptr,
81 HB_GDEFHeader* gdef,
82 HB_Stream gdefStream )
83 {
84 HB_UInt cur_offset, new_offset, base_offset;
85
86 HB_GPOSHeader* gpos;
87
88 HB_Error error;
89
90
91 if ( !retptr )
92 return ERR(HB_Err_Invalid_Argument);
93
94 if ( GOTO_Table( TTAG_GPOS ) )
95 return error;
96
97 base_offset = FILE_Pos();
98
99 if ( ALLOC ( gpos, sizeof( *gpos ) ) )
100 return error;
101
102 #ifdef HB_SUPPORT_MULTIPLE_MASTER
103 gpos->mmfunc = default_mmfunc;
104 #endif
105
106 /* skip version */
107
108 if ( FILE_Seek( base_offset + 4L ) ||
109 ACCESS_Frame( 2L ) )
110 goto Fail4;
111
112 new_offset = GET_UShort() + base_offset;
113
114 FORGET_Frame();
115
116 cur_offset = FILE_Pos();
117 if ( FILE_Seek( new_offset ) ||
118 ( error = _HB_OPEN_Load_ScriptList( &gpos->ScriptList,
119 stream ) ) != HB_Err_Ok )
120 goto Fail4;
121 (void)FILE_Seek( cur_offset );
122
123 if ( ACCESS_Frame( 2L ) )
124 goto Fail3;
125
126 new_offset = GET_UShort() + base_offset;
127
128 FORGET_Frame();
129
130 cur_offset = FILE_Pos();
131 if ( FILE_Seek( new_offset ) ||
132 ( error = _HB_OPEN_Load_FeatureList( &gpos->FeatureList,
133 stream ) ) != HB_Err_Ok )
134 goto Fail3;
135 (void)FILE_Seek( cur_offset );
136
137 if ( ACCESS_Frame( 2L ) )
138 goto Fail2;
139
140 new_offset = GET_UShort() + base_offset;
141
142 FORGET_Frame();
143
144 cur_offset = FILE_Pos();
145 if ( FILE_Seek( new_offset ) ||
146 ( error = _HB_OPEN_Load_LookupList( &gpos->LookupList,
147 stream, HB_Type_GPOS ) ) != HB_Err_Ok )
148 goto Fail2;
149
150 gpos->gdef = gdef; /* can be NULL */
151
152 if ( ( error = _HB_GDEF_LoadMarkAttachClassDef_From_LookupFlags( gdef, gdefStream,
153 gpos->LookupList.Lookup,
154 gpos->LookupList.LookupCount ) ) )
155 goto Fail1;
156
157 *retptr = gpos;
158
159 return HB_Err_Ok;
160
161 Fail1:
162 _HB_OPEN_Free_LookupList( &gpos->LookupList, HB_Type_GPOS );
163
164 Fail2:
165 _HB_OPEN_Free_FeatureList( &gpos->FeatureList );
166
167 Fail3:
168 _HB_OPEN_Free_ScriptList( &gpos->ScriptList );
169
170 Fail4:
171 FREE( gpos );
172
173 return error;
174 }
175
176
177 HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos )
178 {
179 _HB_OPEN_Free_LookupList( &gpos->LookupList, HB_Type_GPOS );
180 _HB_OPEN_Free_FeatureList( &gpos->FeatureList );
181 _HB_OPEN_Free_ScriptList( &gpos->ScriptList );
182
183 FREE( gpos );
184
185 return HB_Err_Ok;
186 }
187
188
189 /*****************************
190 * SubTable related functions
191 *****************************/
192
193 /* shared tables */
194
195 /* ValueRecord */
196
197 /* There is a subtle difference in the specs between a `table' and a
198 `record' -- offsets for device tables in ValueRecords are taken from
199 the parent table and not the parent record. */
200
201 static HB_Error Load_ValueRecord( HB_ValueRecord* vr,
202 HB_UShort format,
203 HB_UInt base_offset,
204 HB_Stream stream )
205 {
206 HB_Error error;
207
208 HB_UInt cur_offset, new_offset;
209
210
211 if ( format & HB_GPOS_FORMAT_HAVE_X_PLACEMENT )
212 {
213 if ( ACCESS_Frame( 2L ) )
214 return error;
215
216 vr->XPlacement = GET_Short();
217
218 FORGET_Frame();
219 }
220 else
221 vr->XPlacement = 0;
222
223 if ( format & HB_GPOS_FORMAT_HAVE_Y_PLACEMENT )
224 {
225 if ( ACCESS_Frame( 2L ) )
226 return error;
227
228 vr->YPlacement = GET_Short();
229
230 FORGET_Frame();
231 }
232 else
233 vr->YPlacement = 0;
234
235 if ( format & HB_GPOS_FORMAT_HAVE_X_ADVANCE )
236 {
237 if ( ACCESS_Frame( 2L ) )
238 return error;
239
240 vr->XAdvance = GET_Short();
241
242 FORGET_Frame();
243 }
244 else
245 vr->XAdvance = 0;
246
247 if ( format & HB_GPOS_FORMAT_HAVE_Y_ADVANCE )
248 {
249 if ( ACCESS_Frame( 2L ) )
250 return error;
251
252 vr->YAdvance = GET_Short();
253
254 FORGET_Frame();
255 }
256 else
257 vr->YAdvance = 0;
258
259 if ( format & HB_GPOS_FORMAT_HAVE_DEVICE_TABLES )
260 {
261 if ( ALLOC_ARRAY( vr->DeviceTables, 4, HB_Device ) )
262 return error;
263 vr->DeviceTables[VR_X_ADVANCE_DEVICE] = 0;
264 vr->DeviceTables[VR_Y_ADVANCE_DEVICE] = 0;
265 vr->DeviceTables[VR_X_PLACEMENT_DEVICE] = 0;
266 vr->DeviceTables[VR_Y_PLACEMENT_DEVICE] = 0;
267 }
268 else
269 {
270 vr->DeviceTables = 0;
271 }
272
273 if ( format & HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE )
274 {
275 if ( ACCESS_Frame( 2L ) )
276 goto Fail4;
277
278 new_offset = GET_UShort();
279
280 FORGET_Frame();
281
282 if ( new_offset )
283 {
284 new_offset += base_offset;
285
286 cur_offset = FILE_Pos();
287 if ( FILE_Seek( new_offset ) ||
288 ( error = _HB_OPEN_Load_Device( &vr->DeviceTables[VR_X_PLACEMENT_DEVICE],
289 stream ) ) != HB_Err_Ok )
290 goto Fail4;
291 (void)FILE_Seek( cur_offset );
292 }
293 }
294
295 if ( format & HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE )
296 {
297 if ( ACCESS_Frame( 2L ) )
298 goto Fail3;
299
300 new_offset = GET_UShort();
301
302 FORGET_Frame();
303
304 if ( new_offset )
305 {
306 new_offset += base_offset;
307
308 cur_offset = FILE_Pos();
309 if ( FILE_Seek( new_offset ) ||
310 ( error = _HB_OPEN_Load_Device( &vr->DeviceTables[VR_Y_PLACEMENT_DEVICE],
311 stream ) ) != HB_Err_Ok )
312 goto Fail3;
313 (void)FILE_Seek( cur_offset );
314 }
315 }
316
317 if ( format & HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE )
318 {
319 if ( ACCESS_Frame( 2L ) )
320 goto Fail2;
321
322 new_offset = GET_UShort();
323
324 FORGET_Frame();
325
326 if ( new_offset )
327 {
328 new_offset += base_offset;
329
330 cur_offset = FILE_Pos();
331 if ( FILE_Seek( new_offset ) ||
332 ( error = _HB_OPEN_Load_Device( &vr->DeviceTables[VR_X_ADVANCE_DEVICE],
333 stream ) ) != HB_Err_Ok )
334 goto Fail2;
335 (void)FILE_Seek( cur_offset );
336 }
337 }
338
339 if ( format & HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE )
340 {
341 if ( ACCESS_Frame( 2L ) )
342 goto Fail1;
343
344 new_offset = GET_UShort();
345
346 FORGET_Frame();
347
348 if ( new_offset )
349 {
350 new_offset += base_offset;
351
352 cur_offset = FILE_Pos();
353 if ( FILE_Seek( new_offset ) ||
354 ( error = _HB_OPEN_Load_Device( &vr->DeviceTables[VR_Y_ADVANCE_DEVICE],
355 stream ) ) != HB_Err_Ok )
356 goto Fail1;
357 (void)FILE_Seek( cur_offset );
358 }
359 }
360
361 if ( format & HB_GPOS_FORMAT_HAVE_X_ID_PLACEMENT )
362 {
363 if ( ACCESS_Frame( 2L ) )
364 goto Fail1;
365
366 #ifdef HB_SUPPORT_MULTIPLE_MASTER
367 vr->XIdPlacement = GET_UShort();
368 #else
369 (void) GET_UShort();
370 #endif
371
372 FORGET_Frame();
373 }
374 #ifdef HB_SUPPORT_MULTIPLE_MASTER
375 else
376 vr->XIdPlacement = 0;
377 #endif
378
379 if ( format & HB_GPOS_FORMAT_HAVE_Y_ID_PLACEMENT )
380 {
381 if ( ACCESS_Frame( 2L ) )
382 goto Fail1;
383
384 #ifdef HB_SUPPORT_MULTIPLE_MASTER
385 vr->YIdPlacement = GET_UShort();
386 #else
387 (void) GET_UShort();
388 #endif
389
390 FORGET_Frame();
391 }
392 #ifdef HB_SUPPORT_MULTIPLE_MASTER
393 else
394 vr->YIdPlacement = 0;
395 #endif
396
397 if ( format & HB_GPOS_FORMAT_HAVE_X_ID_ADVANCE )
398 {
399 if ( ACCESS_Frame( 2L ) )
400 goto Fail1;
401
402 #ifdef HB_SUPPORT_MULTIPLE_MASTER
403 vr->XIdAdvance = GET_UShort();
404 #else
405 (void) GET_UShort();
406 #endif
407
408 FORGET_Frame();
409 }
410 #ifdef HB_SUPPORT_MULTIPLE_MASTER
411 else
412 vr->XIdAdvance = 0;
413 #endif
414
415 if ( format & HB_GPOS_FORMAT_HAVE_Y_ID_ADVANCE )
416 {
417 if ( ACCESS_Frame( 2L ) )
418 goto Fail1;
419
420 #ifdef HB_SUPPORT_MULTIPLE_MASTER
421 vr->YIdAdvance = GET_UShort();
422 #else
423 (void) GET_UShort();
424 #endif
425
426 FORGET_Frame();
427 }
428 #ifdef HB_SUPPORT_MULTIPLE_MASTER
429 else
430 vr->YIdAdvance = 0;
431 #endif
432
433 return HB_Err_Ok;
434
435 Fail1:
436 if ( vr->DeviceTables )
437 _HB_OPEN_Free_Device( vr->DeviceTables[VR_Y_ADVANCE_DEVICE] );
438
439 Fail2:
440 if ( vr->DeviceTables )
441 _HB_OPEN_Free_Device( vr->DeviceTables[VR_X_ADVANCE_DEVICE] );
442
443 Fail3:
444 if ( vr->DeviceTables )
445 _HB_OPEN_Free_Device( vr->DeviceTables[VR_Y_PLACEMENT_DEVICE] );
446
447 Fail4:
448 FREE( vr->DeviceTables );
449 return error;
450 }
451
452
453 static void Free_ValueRecord( HB_ValueRecord* vr,
454 HB_UShort format )
455 {
456 if ( format & HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE )
457 _HB_OPEN_Free_Device( vr->DeviceTables[VR_Y_ADVANCE_DEVICE] );
458 if ( format & HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE )
459 _HB_OPEN_Free_Device( vr->DeviceTables[VR_X_ADVANCE_DEVICE] );
460 if ( format & HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE )
461 _HB_OPEN_Free_Device( vr->DeviceTables[VR_Y_PLACEMENT_DEVICE] );
462 if ( format & HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE )
463 _HB_OPEN_Free_Device( vr->DeviceTables[VR_X_PLACEMENT_DEVICE] );
464 FREE( vr->DeviceTables );
465 }
466
467
468 static HB_Error Get_ValueRecord( GPOS_Instance* gpi,
469 HB_ValueRecord* vr,
470 HB_UShort format,
471 HB_Position gd )
472 {
473 HB_Short pixel_value;
474 HB_Error error = HB_Err_Ok;
475 #ifdef HB_SUPPORT_MULTIPLE_MASTER
476 HB_GPOSHeader* gpos = gpi->gpos;
477 HB_Fixed value;
478 #endif
479
480 HB_UShort x_ppem, y_ppem;
481 HB_16Dot16 x_scale, y_scale;
482
483
484 if ( !format )
485 return HB_Err_Ok;
486
487 x_ppem = gpi->font->x_ppem;
488 y_ppem = gpi->font->y_ppem;
489 x_scale = gpi->font->x_scale;
490 y_scale = gpi->font->y_scale;
491
492 /* design units -> fractional pixel */
493
494 if ( format & HB_GPOS_FORMAT_HAVE_X_PLACEMENT )
495 gd->x_pos += x_scale * vr->XPlacement / 0x10000;
496 if ( format & HB_GPOS_FORMAT_HAVE_Y_PLACEMENT )
497 gd->y_pos += y_scale * vr->YPlacement / 0x10000;
498 if ( format & HB_GPOS_FORMAT_HAVE_X_ADVANCE )
499 gd->x_advance += x_scale * vr->XAdvance / 0x10000;
500 if ( format & HB_GPOS_FORMAT_HAVE_Y_ADVANCE )
501 gd->y_advance += y_scale * vr->YAdvance / 0x10000;
502
503 if ( !gpi->dvi )
504 {
505 /* pixel -> fractional pixel */
506
507 if ( format & HB_GPOS_FORMAT_HAVE_X_PLACEMENT_DEVICE )
508 {
509 _HB_OPEN_Get_Device( vr->DeviceTables[VR_X_PLACEMENT_DEVICE], x_ppem, &pixel_value );
510 gd->x_pos += pixel_value << 6;
511 }
512 if ( format & HB_GPOS_FORMAT_HAVE_Y_PLACEMENT_DEVICE )
513 {
514 _HB_OPEN_Get_Device( vr->DeviceTables[VR_Y_PLACEMENT_DEVICE], y_ppem, &pixel_value );
515 gd->y_pos += pixel_value << 6;
516 }
517 if ( format & HB_GPOS_FORMAT_HAVE_X_ADVANCE_DEVICE )
518 {
519 _HB_OPEN_Get_Device( vr->DeviceTables[VR_X_ADVANCE_DEVICE], x_ppem, &pixel_value );
520 gd->x_advance += pixel_value << 6;
521 }
522 if ( format & HB_GPOS_FORMAT_HAVE_Y_ADVANCE_DEVICE )
523 {
524 _HB_OPEN_Get_Device( vr->DeviceTables[VR_Y_ADVANCE_DEVICE], y_ppem, &pixel_value );
525 gd->y_advance += pixel_value << 6;
526 }
527 }
528
529 #ifdef HB_SUPPORT_MULTIPLE_MASTER
530 /* values returned from mmfunc() are already in fractional pixels */
531
532 if ( format & HB_GPOS_FORMAT_HAVE_X_ID_PLACEMENT )
533 {
534 error = (gpos->mmfunc)( gpi->font, vr->XIdPlacement,
535 &value, gpos->data );
536 if ( error )
537 return error;
538 gd->x_pos += value;
539 }
540 if ( format & HB_GPOS_FORMAT_HAVE_Y_ID_PLACEMENT )
541 {
542 error = (gpos->mmfunc)( gpi->font, vr->YIdPlacement,
543 &value, gpos->data );
544 if ( error )
545 return error;
546 gd->y_pos += value;
547 }
548 if ( format & HB_GPOS_FORMAT_HAVE_X_ID_ADVANCE )
549 {
550 error = (gpos->mmfunc)( gpi->font, vr->XIdAdvance,
551 &value, gpos->data );
552 if ( error )
553 return error;
554 gd->x_advance += value;
555 }
556 if ( format & HB_GPOS_FORMAT_HAVE_Y_ID_ADVANCE )
557 {
558 error = (gpos->mmfunc)( gpi->font, vr->YIdAdvance,
559 &value, gpos->data );
560 if ( error )
561 return error;
562 gd->y_advance += value;
563 }
564 #endif
565
566 return error;
567 }
568
569
570 /* AnchorFormat1 */
571 /* AnchorFormat2 */
572 /* AnchorFormat3 */
573 /* AnchorFormat4 */
574
575 static HB_Error Load_Anchor( HB_Anchor* an,
576 HB_Stream stream )
577 {
578 HB_Error error;
579
580 HB_UInt cur_offset, new_offset, base_offset;
581
582
583 base_offset = FILE_Pos();
584
585 if ( ACCESS_Frame( 2L ) )
586 return error;
587
588 an->PosFormat = GET_UShort();
589
590 FORGET_Frame();
591
592 switch ( an->PosFormat )
593 {
594 case 1:
595 if ( ACCESS_Frame( 4L ) )
596 return error;
597
598 an->af.af1.XCoordinate = GET_Short();
599 an->af.af1.YCoordinate = GET_Short();
600
601 FORGET_Frame();
602 break;
603
604 case 2:
605 if ( ACCESS_Frame( 6L ) )
606 return error;
607
608 an->af.af2.XCoordinate = GET_Short();
609 an->af.af2.YCoordinate = GET_Short();
610 an->af.af2.AnchorPoint = GET_UShort();
611
612 FORGET_Frame();
613 break;
614
615 case 3:
616 if ( ACCESS_Frame( 6L ) )
617 return error;
618
619 an->af.af3.XCoordinate = GET_Short();
620 an->af.af3.YCoordinate = GET_Short();
621
622 new_offset = GET_UShort();
623
624 FORGET_Frame();
625
626 if ( new_offset )
627 {
628 if ( ALLOC_ARRAY( an->af.af3.DeviceTables, 2, HB_Device ) )
629 return error;
630
631 an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE] = 0;
632 an->af.af3.DeviceTables[AF3_Y_DEVICE_TABLE] = 0;
633
634 new_offset += base_offset;
635
636 cur_offset = FILE_Pos();
637 if ( FILE_Seek( new_offset ) ||
638 ( error = _HB_OPEN_Load_Device( &an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE],
639 stream ) ) != HB_Err_Ok )
640 goto Fail2;
641 (void)FILE_Seek( cur_offset );
642 }
643
644 if ( ACCESS_Frame( 2L ) )
645 goto Fail;
646
647 new_offset = GET_UShort();
648
649 FORGET_Frame();
650
651 if ( new_offset )
652 {
653 if ( !an->af.af3.DeviceTables )
654 {
655 if ( ALLOC_ARRAY( an->af.af3.DeviceTables, 2, HB_Device ) )
656 return error;
657
658 an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE] = 0;
659 an->af.af3.DeviceTables[AF3_Y_DEVICE_TABLE] = 0;
660 }
661
662 new_offset += base_offset;
663
664 cur_offset = FILE_Pos();
665 if ( FILE_Seek( new_offset ) ||
666 ( error = _HB_OPEN_Load_Device( &an->af.af3.DeviceTables[AF3_Y_DEVICE_TABLE],
667 stream ) ) != HB_Err_Ok )
668 goto Fail;
669 (void)FILE_Seek( cur_offset );
670 }
671 break;
672
673 case 4:
674 if ( ACCESS_Frame( 4L ) )
675 return error;
676
677 #ifdef HB_SUPPORT_MULTIPLE_MASTER
678 an->af.af4.XIdAnchor = GET_UShort();
679 an->af.af4.YIdAnchor = GET_UShort();
680 #else
681 (void) GET_UShort();
682 (void) GET_UShort();
683 #endif
684
685 FORGET_Frame();
686 break;
687
688 default:
689 return ERR(HB_Err_Invalid_SubTable_Format);
690 }
691
692 return HB_Err_Ok;
693
694 Fail:
695 if ( an->af.af3.DeviceTables )
696 _HB_OPEN_Free_Device( an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE] );
697
698 Fail2:
699 FREE( an->af.af3.DeviceTables );
700 return error;
701 }
702
703
704 static void Free_Anchor( HB_Anchor* an)
705 {
706 if ( an->PosFormat == 3 && an->af.af3.DeviceTables )
707 {
708 _HB_OPEN_Free_Device( an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE] );
709 _HB_OPEN_Free_Device( an->af.af3.DeviceTables[AF3_Y_DEVICE_TABLE] );
710 FREE( an->af.af3.DeviceTables );
711 }
712 }
713
714
715 static HB_Error Get_Anchor( GPOS_Instance* gpi,
716 HB_Anchor* an,
717 HB_UShort glyph_index,
718 HB_Fixed* x_value,
719 HB_Fixed* y_value )
720 {
721 HB_Error error = HB_Err_Ok;
722
723 #ifdef HB_SUPPORT_MULTIPLE_MASTER
724 HB_GPOSHeader* gpos = gpi->gpos;
725 #endif
726 HB_UShort ap;
727
728 HB_Short pixel_value;
729
730 HB_UShort x_ppem, y_ppem;
731 HB_16Dot16 x_scale, y_scale;
732
733
734 x_ppem = gpi->font->x_ppem;
735 y_ppem = gpi->font->y_ppem;
736 x_scale = gpi->font->x_scale;
737 y_scale = gpi->font->y_scale;
738
739 switch ( an->PosFormat )
740 {
741 case 0:
742 /* The special case of an empty AnchorTable */
743 default:
744
745 return HB_Err_Not_Covered;
746
747 case 1:
748 *x_value = x_scale * an->af.af1.XCoordinate / 0x10000;
749 *y_value = y_scale * an->af.af1.YCoordinate / 0x10000;
750 break;
751
752 case 2:
753 if ( !gpi->dvi )
754 {
755 hb_uint32 n_points = 0;
756 ap = an->af.af2.AnchorPoint;
757 if (!gpi->font->klass->getPointInOutline)
758 goto no_contour_point;
759 error = gpi->font->klass->getPointInOutline(gpi->font, glyph_index, gpi->load_flags, ap, x_value, y_value, &n_points);
760 if (error)
761 return error;
762 /* if n_points is set to zero, we use the design coordinate value pair.
763 * This can happen e.g. for sbit glyphs. */
764 if (!n_points)
765 goto no_contour_point;
766 }
767 else
768 {
769 no_contour_point:
770 *x_value = x_scale * an->af.af3.XCoordinate / 0x10000;
771 *y_value = y_scale * an->af.af3.YCoordinate / 0x10000;
772 }
773 break;
774
775 case 3:
776 if ( !gpi->dvi )
777 {
778 _HB_OPEN_Get_Device( an->af.af3.DeviceTables[AF3_X_DEVICE_TABLE], x_ppem, &pixel_value );
779 *x_value = pixel_value << 6;
780 _HB_OPEN_Get_Device( an->af.af3.DeviceTables[AF3_Y_DEVICE_TABLE], y_ppem, &pixel_value );
781 *y_value = pixel_value << 6;
782 }
783 else
784 *x_value = *y_value = 0;
785
786 *x_value += x_scale * an->af.af3.XCoordinate / 0x10000;
787 *y_value += y_scale * an->af.af3.YCoordinate / 0x10000;
788 break;
789
790 case 4:
791 #ifdef HB_SUPPORT_MULTIPLE_MASTER
792 error = (gpos->mmfunc)( gpi->font, an->af.af4.XIdAnchor,
793 x_value, gpos->data );
794 if ( error )
795 return error;
796
797 error = (gpos->mmfunc)( gpi->font, an->af.af4.YIdAnchor,
798 y_value, gpos->data );
799 if ( error )
800 return error;
801 break;
802 #else
803 return ERR(HB_Err_Not_Covered);
804 #endif
805 }
806
807 return error;
808 }
809
810
811 /* MarkArray */
812
813 static HB_Error Load_MarkArray ( HB_MarkArray* ma,
814 HB_Stream stream )
815 {
816 HB_Error error;
817
818 HB_UShort n, m, count;
819 HB_UInt cur_offset, new_offset, base_offset;
820
821 HB_MarkRecord* mr;
822
823
824 base_offset = FILE_Pos();
825
826 if ( ACCESS_Frame( 2L ) )
827 return error;
828
829 count = ma->MarkCount = GET_UShort();
830
831 FORGET_Frame();
832
833 ma->MarkRecord = NULL;
834
835 if ( ALLOC_ARRAY( ma->MarkRecord, count, HB_MarkRecord ) )
836 return error;
837
838 mr = ma->MarkRecord;
839
840 for ( n = 0; n < count; n++ )
841 {
842 if ( ACCESS_Frame( 4L ) )
843 goto Fail;
844
845 mr[n].Class = GET_UShort();
846 new_offset = GET_UShort() + base_offset;
847
848 FORGET_Frame();
849
850 cur_offset = FILE_Pos();
851 if ( FILE_Seek( new_offset ) ||
852 ( error = Load_Anchor( &mr[n].MarkAnchor, stream ) ) != HB_Err_Ok )
853 goto Fail;
854 (void)FILE_Seek( cur_offset );
855 }
856
857 return HB_Err_Ok;
858
859 Fail:
860 for ( m = 0; m < n; m++ )
861 Free_Anchor( &mr[m].MarkAnchor );
862
863 FREE( mr );
864 return error;
865 }
866
867
868 static void Free_MarkArray( HB_MarkArray* ma )
869 {
870 HB_UShort n, count;
871
872 HB_MarkRecord* mr;
873
874
875 if ( ma->MarkRecord )
876 {
877 count = ma->MarkCount;
878 mr = ma->MarkRecord;
879
880 for ( n = 0; n < count; n++ )
881 Free_Anchor( &mr[n].MarkAnchor );
882
883 FREE( mr );
884 }
885 }
886
887
888 /* LookupType 1 */
889
890 /* SinglePosFormat1 */
891 /* SinglePosFormat2 */
892
893 static HB_Error Load_SinglePos( HB_GPOS_SubTable* st,
894 HB_Stream stream )
895 {
896 HB_Error error;
897 HB_SinglePos* sp = &st->single;
898
899 HB_UShort n, m, count, format;
900 HB_UInt cur_offset, new_offset, base_offset;
901
902 HB_ValueRecord* vr;
903
904
905 base_offset = FILE_Pos();
906
907 if ( ACCESS_Frame( 6L ) )
908 return error;
909
910 sp->PosFormat = GET_UShort();
911 new_offset = GET_UShort() + base_offset;
912
913 format = sp->ValueFormat = GET_UShort();
914
915 FORGET_Frame();
916
917 if ( !format )
918 return ERR(HB_Err_Invalid_SubTable);
919
920 cur_offset = FILE_Pos();
921 if ( FILE_Seek( new_offset ) ||
922 ( error = _HB_OPEN_Load_Coverage( &sp->Coverage, stream ) ) != HB_Err_Ok )
923 return error;
924 (void)FILE_Seek( cur_offset );
925
926 switch ( sp->PosFormat )
927 {
928 case 1:
929 error = Load_ValueRecord( &sp->spf.spf1.Value, format,
930 base_offset, stream );
931 if ( error )
932 goto Fail2;
933 break;
934
935 case 2:
936 if ( ACCESS_Frame( 2L ) )
937 goto Fail2;
938
939 count = sp->spf.spf2.ValueCount = GET_UShort();
940
941 FORGET_Frame();
942
943 sp->spf.spf2.Value = NULL;
944
945 if ( ALLOC_ARRAY( sp->spf.spf2.Value, count, HB_ValueRecord ) )
946 goto Fail2;
947
948 vr = sp->spf.spf2.Value;
949
950 for ( n = 0; n < count; n++ )
951 {
952 error = Load_ValueRecord( &vr[n], format, base_offset, stream );
953 if ( error )
954 goto Fail1;
955 }
956 break;
957
958 default:
959 return ERR(HB_Err_Invalid_SubTable_Format);
960 }
961
962 return HB_Err_Ok;
963
964 Fail1:
965 for ( m = 0; m < n; m++ )
966 Free_ValueRecord( &vr[m], format );
967
968 FREE( vr );
969
970 Fail2:
971 _HB_OPEN_Free_Coverage( &sp->Coverage );
972 return error;
973 }
974
975
976 static void Free_SinglePos( HB_GPOS_SubTable* st )
977 {
978 HB_UShort n, count, format;
979 HB_SinglePos* sp = &st->single;
980
981 HB_ValueRecord* v;
982
983
984 format = sp->ValueFormat;
985
986 switch ( sp->PosFormat )
987 {
988 case 1:
989 Free_ValueRecord( &sp->spf.spf1.Value, format );
990 break;
991
992 case 2:
993 if ( sp->spf.spf2.Value )
994 {
995 count = sp->spf.spf2.ValueCount;
996 v = sp->spf.spf2.Value;
997
998 for ( n = 0; n < count; n++ )
999 Free_ValueRecord( &v[n], format );
1000
1001 FREE( v );
1002 }
1003 break;
1004 default:
1005 break;
1006 }
1007
1008 _HB_OPEN_Free_Coverage( &sp->Coverage );
1009 }
1010
1011 static HB_Error Lookup_SinglePos( GPOS_Instance* gpi,
1012 HB_GPOS_SubTable* st,
1013 HB_Buffer buffer,
1014 HB_UShort flags,
1015 HB_UShort context_length,
1016 int nesting_level )
1017 {
1018 HB_UShort index, property;
1019 HB_Error error;
1020 HB_GPOSHeader* gpos = gpi->gpos;
1021 HB_SinglePos* sp = &st->single;
1022
1023 HB_UNUSED(nesting_level);
1024
1025 if ( context_length != 0xFFFF && context_length < 1 )
1026 return HB_Err_Not_Covered;
1027
1028 if ( CHECK_Property( gpos->gdef, IN_CURITEM(), flags, &property ) )
1029 return error;
1030
1031 error = _HB_OPEN_Coverage_Index( &sp->Coverage, IN_CURGLYPH(), &index );
1032 if ( error )
1033 return error;
1034
1035 switch ( sp->PosFormat )
1036 {
1037 case 1:
1038 error = Get_ValueRecord( gpi, &sp->spf.spf1.Value,
1039 sp->ValueFormat, POSITION( buffer->in_pos ) );
1040 if ( error )
1041 return error;
1042 break;
1043
1044 case 2:
1045 if ( index >= sp->spf.spf2.ValueCount )
1046 return ERR(HB_Err_Invalid_SubTable);
1047 error = Get_ValueRecord( gpi, &sp->spf.spf2.Value[index],
1048 sp->ValueFormat, POSITION( buffer->in_pos ) );
1049 if ( error )
1050 return error;
1051 break;
1052
1053 default:
1054 return ERR(HB_Err_Invalid_SubTable);
1055 }
1056
1057 (buffer->in_pos)++;
1058
1059 return HB_Err_Ok;
1060 }
1061
1062
1063 /* LookupType 2 */
1064
1065 /* PairSet */
1066
1067 static HB_Error Load_PairSet ( HB_PairSet* ps,
1068 HB_UShort format1,
1069 HB_UShort format2,
1070 HB_Stream stream )
1071 {
1072 HB_Error error;
1073
1074 HB_UShort n, m, count;
1075 HB_UInt base_offset;
1076
1077 HB_PairValueRecord* pvr;
1078
1079
1080 base_offset = FILE_Pos();
1081
1082 if ( ACCESS_Frame( 2L ) )
1083 return error;
1084
1085 count = ps->PairValueCount = GET_UShort();
1086
1087 FORGET_Frame();
1088
1089 ps->PairValueRecord = NULL;
1090
1091 if ( ALLOC_ARRAY( ps->PairValueRecord, count, HB_PairValueRecord ) )
1092 return error;
1093
1094 pvr = ps->PairValueRecord;
1095
1096 for ( n = 0; n < count; n++ )
1097 {
1098 if ( ACCESS_Frame( 2L ) )
1099 goto Fail;
1100
1101 pvr[n].SecondGlyph = GET_UShort();
1102
1103 FORGET_Frame();
1104
1105 if ( format1 )
1106 {
1107 error = Load_ValueRecord( &pvr[n].Value1, format1,
1108 base_offset, stream );
1109 if ( error )
1110 goto Fail;
1111 }
1112 if ( format2 )
1113 {
1114 error = Load_ValueRecord( &pvr[n].Value2, format2,
1115 base_offset, stream );
1116 if ( error )
1117 {
1118 if ( format1 )
1119 Free_ValueRecord( &pvr[n].Value1, format1 );
1120 goto Fail;
1121 }
1122 }
1123 }
1124
1125 return HB_Err_Ok;
1126
1127 Fail:
1128 for ( m = 0; m < n; m++ )
1129 {
1130 if ( format1 )
1131 Free_ValueRecord( &pvr[m].Value1, format1 );
1132 if ( format2 )
1133 Free_ValueRecord( &pvr[m].Value2, format2 );
1134 }
1135
1136 FREE( pvr );
1137 return error;
1138 }
1139
1140
1141 static void Free_PairSet( HB_PairSet* ps,
1142 HB_UShort format1,
1143 HB_UShort format2 )
1144 {
1145 HB_UShort n, count;
1146
1147 HB_PairValueRecord* pvr;
1148
1149
1150 if ( ps->PairValueRecord )
1151 {
1152 count = ps->PairValueCount;
1153 pvr = ps->PairValueRecord;
1154
1155 for ( n = 0; n < count; n++ )
1156 {
1157 if ( format1 )
1158 Free_ValueRecord( &pvr[n].Value1, format1 );
1159 if ( format2 )
1160 Free_ValueRecord( &pvr[n].Value2, format2 );
1161 }
1162
1163 FREE( pvr );
1164 }
1165 }
1166
1167
1168 /* PairPosFormat1 */
1169
1170 static HB_Error Load_PairPos1( HB_PairPosFormat1* ppf1,
1171 HB_UShort format1,
1172 HB_UShort format2,
1173 HB_Stream stream )
1174 {
1175 HB_Error error;
1176
1177 HB_UShort n, m, count;
1178 HB_UInt cur_offset, new_offset, base_offset;
1179
1180 HB_PairSet* ps;
1181
1182
1183 base_offset = FILE_Pos() - 8L;
1184
1185 if ( ACCESS_Frame( 2L ) )
1186 return error;
1187
1188 count = ppf1->PairSetCount = GET_UShort();
1189
1190 FORGET_Frame();
1191
1192 ppf1->PairSet = NULL;
1193
1194 if ( ALLOC_ARRAY( ppf1->PairSet, count, HB_PairSet ) )
1195 return error;
1196
1197 ps = ppf1->PairSet;
1198
1199 for ( n = 0; n < count; n++ )
1200 {
1201 if ( ACCESS_Frame( 2L ) )
1202 goto Fail;
1203
1204 new_offset = GET_UShort() + base_offset;
1205
1206 FORGET_Frame();
1207
1208 cur_offset = FILE_Pos();
1209 if ( FILE_Seek( new_offset ) ||
1210 ( error = Load_PairSet( &ps[n], format1,
1211 format2, stream ) ) != HB_Err_Ok )
1212 goto Fail;
1213 (void)FILE_Seek( cur_offset );
1214 }
1215
1216 return HB_Err_Ok;
1217
1218 Fail:
1219 for ( m = 0; m < n; m++ )
1220 Free_PairSet( &ps[m], format1, format2 );
1221
1222 FREE( ps );
1223 return error;
1224 }
1225
1226
1227 static void Free_PairPos1( HB_PairPosFormat1* ppf1,
1228 HB_UShort format1,
1229 HB_UShort format2 )
1230 {
1231 HB_UShort n, count;
1232
1233 HB_PairSet* ps;
1234
1235
1236 if ( ppf1->PairSet )
1237 {
1238 count = ppf1->PairSetCount;
1239 ps = ppf1->PairSet;
1240
1241 for ( n = 0; n < count; n++ )
1242 Free_PairSet( &ps[n], format1, format2 );
1243
1244 FREE( ps );
1245 }
1246 }
1247
1248
1249 /* PairPosFormat2 */
1250
1251 static HB_Error Load_PairPos2( HB_PairPosFormat2* ppf2,
1252 HB_UShort format1,
1253 HB_UShort format2,
1254 HB_Stream stream )
1255 {
1256 HB_Error error;
1257
1258 HB_UShort m, n, k, count1, count2;
1259 HB_UInt cur_offset, new_offset1, new_offset2, base_offset;
1260
1261 HB_Class1Record* c1r;
1262 HB_Class2Record* c2r;
1263
1264
1265 base_offset = FILE_Pos() - 8L;
1266
1267 if ( ACCESS_Frame( 8L ) )
1268 return error;
1269
1270 new_offset1 = GET_UShort() + base_offset;
1271 new_offset2 = GET_UShort() + base_offset;
1272
1273 /* `Class1Count' and `Class2Count' are the upper limits for class
1274 values, thus we read it now to make additional safety checks. */
1275
1276 count1 = ppf2->Class1Count = GET_UShort();
1277 count2 = ppf2->Class2Count = GET_UShort();
1278
1279 FORGET_Frame();
1280
1281 cur_offset = FILE_Pos();
1282 if ( FILE_Seek( new_offset1 ) ||
1283 ( error = _HB_OPEN_Load_ClassDefinition( &ppf2->ClassDef1, count1,
1284 stream ) ) != HB_Err_Ok )
1285 return error;
1286 if ( FILE_Seek( new_offset2 ) ||
1287 ( error = _HB_OPEN_Load_ClassDefinition( &ppf2->ClassDef2, count2,
1288 stream ) ) != HB_Err_Ok )
1289 goto Fail3;
1290 (void)FILE_Seek( cur_offset );
1291
1292 ppf2->Class1Record = NULL;
1293
1294 if ( ALLOC_ARRAY( ppf2->Class1Record, count1, HB_Class1Record ) )
1295 goto Fail2;
1296
1297 c1r = ppf2->Class1Record;
1298
1299 for ( m = 0; m < count1; m++ )
1300 {
1301 c1r[m].Class2Record = NULL;
1302
1303 if ( ALLOC_ARRAY( c1r[m].Class2Record, count2, HB_Class2Record ) )
1304 goto Fail1;
1305
1306 c2r = c1r[m].Class2Record;
1307
1308 for ( n = 0; n < count2; n++ )
1309 {
1310 if ( format1 )
1311 {
1312 error = Load_ValueRecord( &c2r[n].Value1, format1,
1313 base_offset, stream );
1314 if ( error )
1315 goto Fail0;
1316 }
1317 if ( format2 )
1318 {
1319 error = Load_ValueRecord( &c2r[n].Value2, format2,
1320 base_offset, stream );
1321 if ( error )
1322 {
1323 if ( format1 )
1324 Free_ValueRecord( &c2r[n].Value1, format1 );
1325 goto Fail0;
1326 }
1327 }
1328 }
1329
1330 continue;
1331
1332 Fail0:
1333 for ( k = 0; k < n; k++ )
1334 {
1335 if ( format1 )
1336 Free_ValueRecord( &c2r[k].Value1, format1 );
1337 if ( format2 )
1338 Free_ValueRecord( &c2r[k].Value2, format2 );
1339 }
1340 goto Fail1;
1341 }
1342
1343 return HB_Err_Ok;
1344
1345 Fail1:
1346 for ( k = 0; k < m; k++ )
1347 {
1348 c2r = c1r[k].Class2Record;
1349
1350 for ( n = 0; n < count2; n++ )
1351 {
1352 if ( format1 )
1353 Free_ValueRecord( &c2r[n].Value1, format1 );
1354 if ( format2 )
1355 Free_ValueRecord( &c2r[n].Value2, format2 );
1356 }
1357
1358 FREE( c2r );
1359 }
1360
1361 FREE( c1r );
1362 Fail2:
1363
1364 _HB_OPEN_Free_ClassDefinition( &ppf2->ClassDef2 );
1365
1366 Fail3:
1367 _HB_OPEN_Free_ClassDefinition( &ppf2->ClassDef1 );
1368 return error;
1369 }
1370
1371
1372 static void Free_PairPos2( HB_PairPosFormat2* ppf2,
1373 HB_UShort format1,
1374 HB_UShort format2)
1375 {
1376 HB_UShort m, n, count1, count2;
1377
1378 HB_Class1Record* c1r;
1379 HB_Class2Record* c2r;
1380
1381
1382 if ( ppf2->Class1Record )
1383 {
1384 c1r = ppf2->Class1Record;
1385 count1 = ppf2->Class1Count;
1386 count2 = ppf2->Class2Count;
1387
1388 for ( m = 0; m < count1; m++ )
1389 {
1390 c2r = c1r[m].Class2Record;
1391
1392 for ( n = 0; n < count2; n++ )
1393 {
1394 if ( format1 )
1395 Free_ValueRecord( &c2r[n].Value1, format1 );
1396 if ( format2 )
1397 Free_ValueRecord( &c2r[n].Value2, format2 );
1398 }
1399
1400 FREE( c2r );
1401 }
1402
1403 FREE( c1r );
1404
1405 _HB_OPEN_Free_ClassDefinition( &ppf2->ClassDef2 );
1406 _HB_OPEN_Free_ClassDefinition( &ppf2->ClassDef1 );
1407 }
1408 }
1409
1410
1411 static HB_Error Load_PairPos( HB_GPOS_SubTable* st,
1412 HB_Stream stream )
1413 {
1414 HB_Error error;
1415 HB_PairPos* pp = &st->pair;
1416
1417 HB_UShort format1, format2;
1418 HB_UInt cur_offset, new_offset, base_offset;
1419
1420
1421 base_offset = FILE_Pos();
1422
1423 if ( ACCESS_Frame( 8L ) )
1424 return error;
1425
1426 pp->PosFormat = GET_UShort();
1427 new_offset = GET_UShort() + base_offset;
1428
1429 format1 = pp->ValueFormat1 = GET_UShort();
1430 format2 = pp->ValueFormat2 = GET_UShort();
1431
1432 FORGET_Frame();
1433
1434 cur_offset = FILE_Pos();
1435 if ( FILE_Seek( new_offset ) ||
1436 ( error = _HB_OPEN_Load_Coverage( &pp->Coverage, stream ) ) != HB_Err_Ok )
1437 return error;
1438 (void)FILE_Seek( cur_offset );
1439
1440 switch ( pp->PosFormat )
1441 {
1442 case 1:
1443 error = Load_PairPos1( &pp->ppf.ppf1, format1, format2, stream );
1444 if ( error )
1445 goto Fail;
1446 break;
1447
1448 case 2:
1449 error = Load_PairPos2( &pp->ppf.ppf2, format1, format2, stream );
1450 if ( error )
1451 goto Fail;
1452 break;
1453
1454 default:
1455 return ERR(HB_Err_Invalid_SubTable_Format);
1456 }
1457
1458 return HB_Err_Ok;
1459
1460 Fail:
1461 _HB_OPEN_Free_Coverage( &pp->Coverage );
1462 return error;
1463 }
1464
1465
1466 static void Free_PairPos( HB_GPOS_SubTable* st )
1467 {
1468 HB_UShort format1, format2;
1469 HB_PairPos* pp = &st->pair;
1470
1471
1472 format1 = pp->ValueFormat1;
1473 format2 = pp->ValueFormat2;
1474
1475 switch ( pp->PosFormat )
1476 {
1477 case 1:
1478 Free_PairPos1( &pp->ppf.ppf1, format1, format2 );
1479 break;
1480
1481 case 2:
1482 Free_PairPos2( &pp->ppf.ppf2, format1, format2 );
1483 break;
1484
1485 default:
1486 break;
1487 }
1488
1489 _HB_OPEN_Free_Coverage( &pp->Coverage );
1490 }
1491
1492
1493 static HB_Error Lookup_PairPos1( GPOS_Instance* gpi,
1494 HB_PairPosFormat1* ppf1,
1495 HB_Buffer buffer,
1496 HB_UInt first_pos,
1497 HB_UShort index,
1498 HB_UShort format1,
1499 HB_UShort format2 )
1500 {
1501 HB_Error error;
1502 HB_UShort numpvr, glyph2;
1503
1504 HB_PairValueRecord* pvr;
1505
1506
1507 if ( index >= ppf1->PairSetCount )
1508 return ERR(HB_Err_Invalid_SubTable);
1509
1510 pvr = ppf1->PairSet[index].PairValueRecord;
1511 if ( !pvr )
1512 return ERR(HB_Err_Invalid_SubTable);
1513
1514 glyph2 = IN_CURGLYPH();
1515
1516 for ( numpvr = ppf1->PairSet[index].PairValueCount;
1517 numpvr;
1518 numpvr--, pvr++ )
1519 {
1520 if ( glyph2 == pvr->SecondGlyph )
1521 {
1522 error = Get_ValueRecord( gpi, &pvr->Value1, format1,
1523 POSITION( first_pos ) );
1524 if ( error )
1525 return error;
1526 return Get_ValueRecord( gpi, &pvr->Value2, format2,
1527 POSITION( buffer->in_pos ) );
1528 }
1529 }
1530
1531 return HB_Err_Not_Covered;
1532 }
1533
1534
1535 static HB_Error Lookup_PairPos2( GPOS_Instance* gpi,
1536 HB_PairPosFormat2* ppf2,
1537 HB_Buffer buffer,
1538 HB_UInt first_pos,
1539 HB_UShort format1,
1540 HB_UShort format2 )
1541 {
1542 HB_Error error;
1543 HB_UShort cl1 = 0, cl2 = 0; /* shut compiler up */
1544
1545 HB_Class1Record* c1r;
1546 HB_Class2Record* c2r;
1547
1548
1549 error = _HB_OPEN_Get_Class( &ppf2->ClassDef1, IN_GLYPH( first_pos ),
1550 &cl1, NULL );
1551 if ( error && error != HB_Err_Not_Covered )
1552 return error;
1553 error = _HB_OPEN_Get_Class( &ppf2->ClassDef2, IN_CURGLYPH(),
1554 &cl2, NULL );
1555 if ( error && error != HB_Err_Not_Covered )
1556 return error;
1557
1558 c1r = &ppf2->Class1Record[cl1];
1559 if ( !c1r )
1560 return ERR(HB_Err_Invalid_SubTable);
1561 c2r = &c1r->Class2Record[cl2];
1562
1563 error = Get_ValueRecord( gpi, &c2r->Value1, format1, POSITION( first_pos ) );
1564 if ( error )
1565 return error;
1566 return Get_ValueRecord( gpi, &c2r->Value2, format2, POSITION( buffer->in_pos ) );
1567 }
1568
1569
1570 static HB_Error Lookup_PairPos( GPOS_Instance* gpi,
1571 HB_GPOS_SubTable* st,
1572 HB_Buffer buffer,
1573 HB_UShort flags,
1574 HB_UShort context_length,
1575 int nesting_level )
1576 {
1577 HB_Error error;
1578 HB_UShort index, property;
1579 HB_UInt first_pos;
1580 HB_GPOSHeader* gpos = gpi->gpos;
1581 HB_PairPos* pp = &st->pair;
1582
1583 HB_UNUSED(nesting_level);
1584
1585 if ( buffer->in_pos >= buffer->in_length - 1 )
1586 return HB_Err_Not_Covered; /* Not enough glyphs in stream */
1587
1588 if ( context_length != 0xFFFF && context_length < 2 )
1589 return HB_Err_Not_Covered;
1590
1591 if ( CHECK_Property( gpos->gdef, IN_CURITEM(), flags, &property ) )
1592 return error;
1593
1594 error = _HB_OPEN_Coverage_Index( &pp->Coverage, IN_CURGLYPH(), &index );
1595 if ( error )
1596 return error;
1597
1598 /* second glyph */
1599
1600 first_pos = buffer->in_pos;
1601 (buffer->in_pos)++;
1602
1603 while ( CHECK_Property( gpos->gdef, IN_CURITEM(),
1604 flags, &property ) )
1605 {
1606 if ( error && error != HB_Err_Not_Covered )
1607 return error;
1608
1609 if ( buffer->in_pos == buffer->in_length )
1610 {
1611 buffer->in_pos = first_pos;
1612 return HB_Err_Not_Covered;
1613 }
1614 (buffer->in_pos)++;
1615
1616 }
1617
1618 switch ( pp->PosFormat )
1619 {
1620 case 1:
1621 error = Lookup_PairPos1( gpi, &pp->ppf.ppf1, buffer,
1622 first_pos, index,
1623 pp->ValueFormat1, pp->ValueFormat2 );
1624 break;
1625
1626 case 2:
1627 error = Lookup_PairPos2( gpi, &pp->ppf.ppf2, buffer, first_pos,
1628 pp->ValueFormat1, pp->ValueFormat2 );
1629 break;
1630
1631 default:
1632 return ERR(HB_Err_Invalid_SubTable_Format);
1633 }
1634
1635 /* if we don't have coverage for the second glyph don't skip it for
1636 further lookups but reset in_pos back to the first_glyph and let
1637 the caller in Do_String_Lookup increment in_pos */
1638 if ( error == HB_Err_Not_Covered )
1639 buffer->in_pos = first_pos;
1640
1641 /* adjusting the `next' glyph */
1642
1643 if ( pp->ValueFormat2 )
1644 (buffer->in_pos)++;
1645
1646 return error;
1647 }
1648
1649
1650 /* LookupType 3 */
1651
1652 /* CursivePosFormat1 */
1653
1654 static HB_Error Load_CursivePos( HB_GPOS_SubTable* st,
1655 HB_Stream stream )
1656 {
1657 HB_Error error;
1658 HB_CursivePos* cp = &st->cursive;
1659
1660 HB_UShort n, m, count;
1661 HB_UInt cur_offset, new_offset, base_offset;
1662
1663 HB_EntryExitRecord* eer;
1664
1665
1666 base_offset = FILE_Pos();
1667
1668 if ( ACCESS_Frame( 4L ) )
1669 return error;
1670
1671 cp->PosFormat = GET_UShort();
1672 new_offset = GET_UShort() + base_offset;
1673
1674 FORGET_Frame();
1675
1676 cur_offset = FILE_Pos();
1677 if ( FILE_Seek( new_offset ) ||
1678 ( error = _HB_OPEN_Load_Coverage( &cp->Coverage, stream ) ) != HB_Err_Ok )
1679 return error;
1680 (void)FILE_Seek( cur_offset );
1681
1682 if ( ACCESS_Frame( 2L ) )
1683 goto Fail2;
1684
1685 count = cp->EntryExitCount = GET_UShort();
1686
1687 FORGET_Frame();
1688
1689 cp->EntryExitRecord = NULL;
1690
1691 if ( ALLOC_ARRAY( cp->EntryExitRecord, count, HB_EntryExitRecord ) )
1692 goto Fail2;
1693
1694 eer = cp->EntryExitRecord;
1695
1696 for ( n = 0; n < count; n++ )
1697 {
1698 HB_UInt entry_offset;
1699
1700 if ( ACCESS_Frame( 2L ) )
1701 return error;
1702
1703 entry_offset = new_offset = GET_UShort();
1704
1705 FORGET_Frame();
1706
1707 if ( new_offset )
1708 {
1709 new_offset += base_offset;
1710
1711 cur_offset = FILE_Pos();
1712 if ( FILE_Seek( new_offset ) ||
1713 ( error = Load_Anchor( &eer[n].EntryAnchor,
1714 stream ) ) != HB_Err_Ok )
1715 goto Fail1;
1716 (void)FILE_Seek( cur_offset );
1717 }
1718 else
1719 eer[n].EntryAnchor.PosFormat = 0;
1720
1721 if ( ACCESS_Frame( 2L ) )
1722 return error;
1723
1724 new_offset = GET_UShort();
1725
1726 FORGET_Frame();
1727
1728 if ( new_offset )
1729 {
1730 new_offset += base_offset;
1731
1732 cur_offset = FILE_Pos();
1733 if ( FILE_Seek( new_offset ) ||
1734 ( error = Load_Anchor( &eer[n].ExitAnchor,
1735 stream ) ) != HB_Err_Ok )
1736 {
1737 if ( entry_offset )
1738 Free_Anchor( &eer[n].EntryAnchor );
1739 goto Fail1;
1740 }
1741 (void)FILE_Seek( cur_offset );
1742 }
1743 else
1744 eer[n].ExitAnchor.PosFormat = 0;
1745 }
1746
1747 return HB_Err_Ok;
1748
1749 Fail1:
1750 for ( m = 0; m < n; m++ )
1751 {
1752 Free_Anchor( &eer[m].EntryAnchor );
1753 Free_Anchor( &eer[m].ExitAnchor );
1754 }
1755
1756 FREE( eer );
1757
1758 Fail2:
1759 _HB_OPEN_Free_Coverage( &cp->Coverage );
1760 return error;
1761 }
1762
1763
1764 static void Free_CursivePos( HB_GPOS_SubTable* st )
1765 {
1766 HB_UShort n, count;
1767 HB_CursivePos* cp = &st->cursive;
1768
1769 HB_EntryExitRecord* eer;
1770
1771
1772 if ( cp->EntryExitRecord )
1773 {
1774 count = cp->EntryExitCount;
1775 eer = cp->EntryExitRecord;
1776
1777 for ( n = 0; n < count; n++ )
1778 {
1779 Free_Anchor( &eer[n].EntryAnchor );
1780 Free_Anchor( &eer[n].ExitAnchor );
1781 }
1782
1783 FREE( eer );
1784 }
1785
1786 _HB_OPEN_Free_Coverage( &cp->Coverage );
1787 }
1788
1789
1790 static HB_Error Lookup_CursivePos( GPOS_Instance* gpi,
1791 HB_GPOS_SubTable* st,
1792 HB_Buffer buffer,
1793 HB_UShort flags,
1794 HB_UShort context_length,
1795 int nesting_level )
1796 {
1797 HB_UShort index, property;
1798 HB_Error error;
1799 HB_GPOSHeader* gpos = gpi->gpos;
1800 HB_CursivePos* cp = &st->cursive;
1801
1802 HB_EntryExitRecord* eer;
1803 HB_Fixed entry_x, entry_y;
1804 HB_Fixed exit_x, exit_y;
1805
1806 HB_UNUSED(nesting_level);
1807
1808 if ( context_length != 0xFFFF && context_length < 1 )
1809 {
1810 gpi->last = 0xFFFF;
1811 return HB_Err_Not_Covered;
1812 }
1813
1814 /* Glyphs not having the right GDEF properties will be ignored, i.e.,
1815 gpi->last won't be reset (contrary to user defined properties). */
1816
1817 if ( CHECK_Property( gpos->gdef, IN_CURITEM(), flags, &property ) )
1818 return error;
1819
1820 /* We don't handle mark glyphs here. According to Andrei, this isn't
1821 possible, but who knows... */
1822
1823 if ( property == HB_GDEF_MARK )
1824 {
1825 gpi->last = 0xFFFF;
1826 return HB_Err_Not_Covered;
1827 }
1828
1829 error = _HB_OPEN_Coverage_Index( &cp->Coverage, IN_CURGLYPH(), &index );
1830 if ( error )
1831 {
1832 gpi->last = 0xFFFF;
1833 return error;
1834 }
1835
1836 if ( index >= cp->EntryExitCount )
1837 return ERR(HB_Err_Invalid_SubTable);
1838
1839 eer = &cp->EntryExitRecord[index];
1840
1841 /* Now comes the messiest part of the whole OpenType
1842 specification. At first glance, cursive connections seem easy
1843 to understand, but there are pitfalls! The reason is that
1844 the specs don't mention how to compute the advance values
1845 resp. glyph offsets. I was told it would be an omission, to
1846 be fixed in the next OpenType version... Again many thanks to
1847 Andrei Burago <andreib@microsoft.com> for clarifications.
1848
1849 Consider the following example:
1850
1851 | xadv1 |
1852 +---------+
1853 | |
1854 +-----+--+ 1 |
1855 | | .| |
1856 | 0+--+------+
1857 | 2 |
1858 | |
1859 0+--------+
1860 | xadv2 |
1861
1862 glyph1: advance width = 12
1863 anchor point = (3,1)
1864
1865 glyph2: advance width = 11
1866 anchor point = (9,4)
1867
1868 LSB is 1 for both glyphs (so the boxes drawn above are glyph
1869 bboxes). Writing direction is R2L; `0' denotes the glyph's
1870 coordinate origin.
1871
1872 Now the surprising part: The advance width of the *left* glyph
1873 (resp. of the *bottom* glyph) will be modified, no matter
1874 whether the writing direction is L2R or R2L (resp. T2B or
1875 B2T)! This assymetry is caused by the fact that the glyph's
1876 coordinate origin is always the lower left corner for all
1877 writing directions.
1878
1879 Continuing the above example, we can compute the new
1880 (horizontal) advance width of glyph2 as
1881
1882 9 - 3 = 6 ,
1883
1884 and the new vertical offset of glyph2 as
1885
1886 1 - 4 = -3 .
1887
1888
1889 Vertical writing direction is far more complicated:
1890
1891 a) Assuming that we recompute the advance height of the lower glyph:
1892
1893 --
1894 +---------+
1895 -- | |
1896 +-----+--+ 1 | yadv1
1897 | | .| |
1898 yadv2 | 0+--+------+ -- BSB1 --
1899 | 2 | -- -- y_offset
1900 | |
1901 BSB2 -- 0+--------+ --
1902 -- --
1903
1904 glyph1: advance height = 6
1905 anchor point = (3,1)
1906
1907 glyph2: advance height = 7
1908 anchor point = (9,4)
1909
1910 TSB is 1 for both glyphs; writing direction is T2B.
1911
1912
1913 BSB1 = yadv1 - (TSB1 + ymax1)
1914 BSB2 = yadv2 - (TSB2 + ymax2)
1915 y_offset = y2 - y1
1916
1917 vertical advance width of glyph2
1918 = y_offset + BSB2 - BSB1
1919 = (y2 - y1) + (yadv2 - (TSB2 + ymax2)) - (yadv1 - (TSB1 + ymax1))
1920 = y2 - y1 + yadv2 - TSB2 - ymax2 - (yadv1 - TSB1 - ymax1)
1921 = y2 - y1 + yadv2 - TSB2 - ymax2 - yadv1 + TSB1 + ymax1
1922
1923
1924 b) Assuming that we recompute the advance height of the upper glyph:
1925
1926 -- --
1927 +---------+ -- TSB1
1928 -- -- | |
1929 TSB2 -- +-----+--+ 1 | yadv1 ymax1
1930 | | .| |
1931 yadv2 | 0+--+------+ -- --
1932 ymax2 | 2 | -- y_offset
1933 | |
1934 -- 0+--------+ --
1935 --
1936
1937 glyph1: advance height = 6
1938 anchor point = (3,1)
1939
1940 glyph2: advance height = 7
1941 anchor point = (9,4)
1942
1943 TSB is 1 for both glyphs; writing direction is T2B.
1944
1945 y_offset = y2 - y1
1946
1947 vertical advance width of glyph2
1948 = TSB1 + ymax1 + y_offset - (TSB2 + ymax2)
1949 = TSB1 + ymax1 + y2 - y1 - TSB2 - ymax2
1950
1951
1952 Comparing a) with b) shows that b) is easier to compute. I'll wait
1953 for a reply from Andrei to see what should really be implemented...
1954
1955 Since horizontal advance widths or vertical advance heights
1956 can be used alone but not together, no ambiguity occurs. */
1957
1958 if ( gpi->last == 0xFFFF )
1959 goto end;
1960
1961 /* Get_Anchor() returns HB_Err_Not_Covered if there is no anchor
1962 table. */
1963
1964 error = Get_Anchor( gpi, &eer->EntryAnchor, IN_CURGLYPH(),
1965 &entry_x, &entry_y );
1966 if ( error == HB_Err_Not_Covered )
1967 goto end;
1968 if ( error )
1969 return error;
1970
1971 if ( gpi->r2l )
1972 {
1973 POSITION( buffer->in_pos )->x_advance = entry_x - gpi->anchor_x;
1974 POSITION( buffer->in_pos )->new_advance = TRUE;
1975 }
1976 else
1977 {
1978 POSITION( gpi->last )->x_advance = gpi->anchor_x - entry_x;
1979 POSITION( gpi->last )->new_advance = TRUE;
1980 }
1981
1982 if ( flags & HB_LOOKUP_FLAG_RIGHT_TO_LEFT )
1983 {
1984 POSITION( gpi->last )->cursive_chain = gpi->last - buffer->in_pos;
1985 POSITION( gpi->last )->y_pos = entry_y - gpi->anchor_y;
1986 }
1987 else
1988 {
1989 POSITION( buffer->in_pos )->cursive_chain = buffer->in_pos - gpi->last;
1990 POSITION( buffer->in_pos )->y_pos = gpi->anchor_y - entry_y;
1991 }
1992
1993 end:
1994 error = Get_Anchor( gpi, &eer->ExitAnchor, IN_CURGLYPH(),
1995 &exit_x, &exit_y );
1996 if ( error == HB_Err_Not_Covered )
1997 gpi->last = 0xFFFF;
1998 else
1999 {
2000 gpi->last = buffer->in_pos;
2001 gpi->anchor_x = exit_x;
2002 gpi->anchor_y = exit_y;
2003 }
2004 if ( error )
2005 return error;
2006
2007 (buffer->in_pos)++;
2008
2009 return HB_Err_Ok;
2010 }
2011
2012
2013 /* LookupType 4 */
2014
2015 /* BaseArray */
2016
2017 static HB_Error Load_BaseArray( HB_BaseArray* ba,
2018 HB_UShort num_classes,
2019 HB_Stream stream )
2020 {
2021 HB_Error error;
2022
2023 HB_UShort m, n, count;
2024 HB_UInt cur_offset, new_offset, base_offset;
2025
2026 HB_BaseRecord *br;
2027 HB_Anchor *ban, *bans;
2028
2029
2030 base_offset = FILE_Pos();
2031
2032 if ( ACCESS_Frame( 2L ) )
2033 return error;
2034
2035 count = ba->BaseCount = GET_UShort();
2036
2037 FORGET_Frame();
2038
2039 ba->BaseRecord = NULL;
2040
2041 if ( ALLOC_ARRAY( ba->BaseRecord, count, HB_BaseRecord ) )
2042 return error;
2043
2044 br = ba->BaseRecord;
2045
2046 bans = NULL;
2047
2048 if ( ALLOC_ARRAY( bans, count * num_classes, HB_Anchor ) )
2049 goto Fail;
2050
2051 for ( m = 0; m < count; m++ )
2052 {
2053 br[m].BaseAnchor = NULL;
2054
2055 ban = br[m].BaseAnchor = bans + m * num_classes;
2056
2057 for ( n = 0; n < num_classes; n++ )
2058 {
2059 if ( ACCESS_Frame( 2L ) )
2060 goto Fail;
2061
2062 new_offset = GET_UShort() + base_offset;
2063
2064 FORGET_Frame();
2065
2066 if (new_offset == base_offset) {
2067 /* XXX
2068 * Doulos SIL Regular is buggy and has zero offsets here.
2069 * Skip it
2070 */
2071 ban[n].PosFormat = 0;
2072 continue;
2073 }
2074
2075 cur_offset = FILE_Pos();
2076 if ( FILE_Seek( new_offset ) ||
2077 ( error = Load_Anchor( &ban[n], stream ) ) != HB_Err_Ok )
2078 goto Fail;
2079 (void)FILE_Seek( cur_offset );
2080 }
2081 }
2082
2083 return HB_Err_Ok;
2084
2085 Fail:
2086 FREE( bans );
2087 FREE( br );
2088 return error;
2089 }
2090
2091
2092 static void Free_BaseArray( HB_BaseArray* ba,
2093 HB_UShort num_classes )
2094 {
2095 HB_BaseRecord *br;
2096 HB_Anchor *bans;
2097
2098 if ( ba->BaseRecord )
2099 {
2100 br = ba->BaseRecord;
2101
2102 if ( ba->BaseCount )
2103 {
2104 HB_UShort i, count;
2105 count = num_classes * ba->BaseCount;
2106 bans = br[0].BaseAnchor;
2107 for (i = 0; i < count; i++)
2108 Free_Anchor (&bans[i]);
2109 FREE( bans );
2110 }
2111
2112 FREE( br );
2113 }
2114 }
2115
2116
2117 /* MarkBasePosFormat1 */
2118
2119 static HB_Error Load_MarkBasePos( HB_GPOS_SubTable* st,
2120 HB_Stream stream )
2121 {
2122 HB_Error error;
2123 HB_MarkBasePos* mbp = &st->markbase;
2124
2125 HB_UInt cur_offset, new_offset, base_offset;
2126
2127
2128 base_offset = FILE_Pos();
2129
2130 if ( ACCESS_Frame( 4L ) )
2131 return error;
2132
2133 mbp->PosFormat = GET_UShort();
2134 new_offset = GET_UShort() + base_offset;
2135
2136 FORGET_Frame();
2137
2138 if (mbp->PosFormat != 1)
2139 return ERR(HB_Err_Invalid_SubTable_Format);
2140
2141 cur_offset = FILE_Pos();
2142 if ( FILE_Seek( new_offset ) ||
2143 ( error = _HB_OPEN_Load_Coverage( &mbp->MarkCoverage, stream ) ) != HB_Err_Ok )
2144 return error;
2145 (void)FILE_Seek( cur_offset );
2146
2147 if ( ACCESS_Frame( 2L ) )
2148 goto Fail3;
2149
2150 new_offset = GET_UShort() + base_offset;
2151
2152 FORGET_Frame();
2153
2154 cur_offset = FILE_Pos();
2155 if ( FILE_Seek( new_offset ) ||
2156 ( error = _HB_OPEN_Load_Coverage( &mbp->BaseCoverage, stream ) ) != HB_Err_Ok )
2157 goto Fail3;
2158 (void)FILE_Seek( cur_offset );
2159
2160 if ( ACCESS_Frame( 4L ) )
2161 goto Fail2;
2162
2163 mbp->ClassCount = GET_UShort();
2164 new_offset = GET_UShort() + base_offset;
2165
2166 FORGET_Frame();
2167
2168 cur_offset = FILE_Pos();
2169 if ( FILE_Seek( new_offset ) ||
2170 ( error = Load_MarkArray( &mbp->MarkArray, stream ) ) != HB_Err_Ok )
2171 goto Fail2;
2172 (void)FILE_Seek( cur_offset );
2173
2174 if ( ACCESS_Frame( 2L ) )
2175 goto Fail1;
2176
2177 new_offset = GET_UShort() + base_offset;
2178
2179 FORGET_Frame();
2180
2181 cur_offset = FILE_Pos();
2182 if ( FILE_Seek( new_offset ) ||
2183 ( error = Load_BaseArray( &mbp->BaseArray, mbp->ClassCount,
2184 stream ) ) != HB_Err_Ok )
2185 goto Fail1;
2186
2187 return HB_Err_Ok;
2188
2189 Fail1:
2190 Free_MarkArray( &mbp->MarkArray );
2191
2192 Fail2:
2193 _HB_OPEN_Free_Coverage( &mbp->BaseCoverage );
2194
2195 Fail3:
2196 _HB_OPEN_Free_Coverage( &mbp->MarkCoverage );
2197 return error;
2198 }
2199
2200
2201 static void Free_MarkBasePos( HB_GPOS_SubTable* st )
2202 {
2203 HB_MarkBasePos* mbp = &st->markbase;
2204
2205 Free_BaseArray( &mbp->BaseArray, mbp->ClassCount );
2206 Free_MarkArray( &mbp->MarkArray );
2207 _HB_OPEN_Free_Coverage( &mbp->BaseCoverage );
2208 _HB_OPEN_Free_Coverage( &mbp->MarkCoverage );
2209 }
2210
2211
2212 static HB_Error Lookup_MarkBasePos( GPOS_Instance* gpi,
2213 HB_GPOS_SubTable* st,
2214 HB_Buffer buffer,
2215 HB_UShort flags,
2216 HB_UShort context_length,
2217 int nesting_level )
2218 {
2219 HB_UShort i, j, mark_index, base_index, property, class;
2220 HB_Fixed x_mark_value, y_mark_value, x_base_value, y_base_value;
2221 HB_Error error;
2222 HB_GPOSHeader* gpos = gpi->gpos;
2223 HB_MarkBasePos* mbp = &st->markbase;
2224
2225 HB_MarkArray* ma;
2226 HB_BaseArray* ba;
2227 HB_BaseRecord* br;
2228 HB_Anchor* mark_anchor;
2229 HB_Anchor* base_anchor;
2230
2231 HB_Position o;
2232
2233 HB_UNUSED(nesting_level);
2234
2235 if ( context_length != 0xFFFF && context_length < 1 )
2236 return HB_Err_Not_Covered;
2237
2238 if ( flags & HB_LOOKUP_FLAG_IGNORE_BASE_GLYPHS )
2239 return HB_Err_Not_Covered;
2240
2241 if ( CHECK_Property( gpos->gdef, IN_CURITEM(),
2242 flags, &property ) )
2243 return error;
2244
2245 error = _HB_OPEN_Coverage_Index( &mbp->MarkCoverage, IN_CURGLYPH(),
2246 &mark_index );
2247 if ( error )
2248 return error;
2249
2250 /* now we search backwards for a non-mark glyph */
2251
2252 i = 1;
2253 j = buffer->in_pos - 1;
2254
2255 while ( i <= buffer->in_pos )
2256 {
2257 error = HB_GDEF_Get_Glyph_Property( gpos->gdef, IN_GLYPH( j ),
2258 &property );
2259 if ( error )
2260 return error;
2261
2262 if ( !( property == HB_GDEF_MARK || property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS ) )
2263 break;
2264
2265 i++;
2266 j--;
2267 }
2268
2269 /* The following assertion is too strong -- at least for mangal.ttf. */
2270 #if 0
2271 if ( property != HB_GDEF_BASE_GLYPH )
2272 return HB_Err_Not_Covered;
2273 #endif
2274
2275 if ( i > buffer->in_pos )
2276 return HB_Err_Not_Covered;
2277
2278 error = _HB_OPEN_Coverage_Index( &mbp->BaseCoverage, IN_GLYPH( j ),
2279 &base_index );
2280 if ( error )
2281 return error;
2282
2283 ma = &mbp->MarkArray;
2284
2285 if ( mark_index >= ma->MarkCount )
2286 return ERR(HB_Err_Invalid_SubTable);
2287
2288 class = ma->MarkRecord[mark_index].Class;
2289 mark_anchor = &ma->MarkRecord[mark_index].MarkAnchor;
2290
2291 if ( class >= mbp->ClassCount )
2292 return ERR(HB_Err_Invalid_SubTable);
2293
2294 ba = &mbp->BaseArray;
2295
2296 if ( base_index >= ba->BaseCount )
2297 return ERR(HB_Err_Invalid_SubTable);
2298
2299 br = &ba->BaseRecord[base_index];
2300 base_anchor = &br->BaseAnchor[class];
2301
2302 error = Get_Anchor( gpi, mark_anchor, IN_CURGLYPH(),
2303 &x_mark_value, &y_mark_value );
2304 if ( error )
2305 return error;
2306
2307 error = Get_Anchor( gpi, base_anchor, IN_GLYPH( j ),
2308 &x_base_value, &y_base_value );
2309 if ( error )
2310 return error;
2311
2312 /* anchor points are not cumulative */
2313
2314 o = POSITION( buffer->in_pos );
2315
2316 o->x_pos = x_base_value - x_mark_value;
2317 o->y_pos = y_base_value - y_mark_value;
2318 o->x_advance = 0;
2319 o->y_advance = 0;
2320 o->back = i;
2321
2322 (buffer->in_pos)++;
2323
2324 return HB_Err_Ok;
2325 }
2326
2327
2328 /* LookupType 5 */
2329
2330 /* LigatureAttach */
2331
2332 static HB_Error Load_LigatureAttach( HB_LigatureAttach* lat,
2333 HB_UShort num_classes,
2334 HB_Stream stream )
2335 {
2336 HB_Error error;
2337
2338 HB_UShort m, n, k, count;
2339 HB_UInt cur_offset, new_offset, base_offset;
2340
2341 HB_ComponentRecord* cr;
2342 HB_Anchor* lan;
2343
2344
2345 base_offset = FILE_Pos();
2346
2347 if ( ACCESS_Frame( 2L ) )
2348 return error;
2349
2350 count = lat->ComponentCount = GET_UShort();
2351
2352 FORGET_Frame();
2353
2354 lat->ComponentRecord = NULL;
2355
2356 if ( ALLOC_ARRAY( lat->ComponentRecord, count, HB_ComponentRecord ) )
2357 return error;
2358
2359 cr = lat->ComponentRecord;
2360
2361 for ( m = 0; m < count; m++ )
2362 {
2363 cr[m].LigatureAnchor = NULL;
2364
2365 if ( ALLOC_ARRAY( cr[m].LigatureAnchor, num_classes, HB_Anchor ) )
2366 goto Fail;
2367
2368 lan = cr[m].LigatureAnchor;
2369
2370 for ( n = 0; n < num_classes; n++ )
2371 {
2372 if ( ACCESS_Frame( 2L ) )
2373 goto Fail0;
2374
2375 new_offset = GET_UShort();
2376
2377 FORGET_Frame();
2378
2379 if ( new_offset )
2380 {
2381 new_offset += base_offset;
2382
2383 cur_offset = FILE_Pos();
2384 if ( FILE_Seek( new_offset ) ||
2385 ( error = Load_Anchor( &lan[n], stream ) ) != HB_Err_Ok )
2386 goto Fail0;
2387 (void)FILE_Seek( cur_offset );
2388 }
2389 else
2390 lan[n].PosFormat = 0;
2391 }
2392
2393 continue;
2394 Fail0:
2395 for ( k = 0; k < n; k++ )
2396 Free_Anchor( &lan[k] );
2397 goto Fail;
2398 }
2399
2400 return HB_Err_Ok;
2401
2402 Fail:
2403 for ( k = 0; k < m; k++ )
2404 {
2405 lan = cr[k].LigatureAnchor;
2406
2407 for ( n = 0; n < num_classes; n++ )
2408 Free_Anchor( &lan[n] );
2409
2410 FREE( lan );
2411 }
2412
2413 FREE( cr );
2414 return error;
2415 }
2416
2417
2418 static void Free_LigatureAttach( HB_LigatureAttach* lat,
2419 HB_UShort num_classes )
2420 {
2421 HB_UShort m, n, count;
2422
2423 HB_ComponentRecord* cr;
2424 HB_Anchor* lan;
2425
2426
2427 if ( lat->ComponentRecord )
2428 {
2429 count = lat->ComponentCount;
2430 cr = lat->ComponentRecord;
2431
2432 for ( m = 0; m < count; m++ )
2433 {
2434 lan = cr[m].LigatureAnchor;
2435
2436 for ( n = 0; n < num_classes; n++ )
2437 Free_Anchor( &lan[n] );
2438
2439 FREE( lan );
2440 }
2441
2442 FREE( cr );
2443 }
2444 }
2445
2446
2447 /* LigatureArray */
2448
2449 static HB_Error Load_LigatureArray( HB_LigatureArray* la,
2450 HB_UShort num_classes,
2451 HB_Stream stream )
2452 {
2453 HB_Error error;
2454
2455 HB_UShort n, m, count;
2456 HB_UInt cur_offset, new_offset, base_offset;
2457
2458 HB_LigatureAttach* lat;
2459
2460
2461 base_offset = FILE_Pos();
2462
2463 if ( ACCESS_Frame( 2L ) )
2464 return error;
2465
2466 count = la->LigatureCount = GET_UShort();
2467
2468 FORGET_Frame();
2469
2470 la->LigatureAttach = NULL;
2471
2472 if ( ALLOC_ARRAY( la->LigatureAttach, count, HB_LigatureAttach ) )
2473 return error;
2474
2475 lat = la->LigatureAttach;
2476
2477 for ( n = 0; n < count; n++ )
2478 {
2479 if ( ACCESS_Frame( 2L ) )
2480 goto Fail;
2481
2482 new_offset = GET_UShort() + base_offset;
2483
2484 FORGET_Frame();
2485
2486 cur_offset = FILE_Pos();
2487 if ( FILE_Seek( new_offset ) ||
2488 ( error = Load_LigatureAttach( &lat[n], num_classes,
2489 stream ) ) != HB_Err_Ok )
2490 goto Fail;
2491 (void)FILE_Seek( cur_offset );
2492 }
2493
2494 return HB_Err_Ok;
2495
2496 Fail:
2497 for ( m = 0; m < n; m++ )
2498 Free_LigatureAttach( &lat[m], num_classes );
2499
2500 FREE( lat );
2501 return error;
2502 }
2503
2504
2505 static void Free_LigatureArray( HB_LigatureArray* la,
2506 HB_UShort num_classes )
2507 {
2508 HB_UShort n, count;
2509
2510 HB_LigatureAttach* lat;
2511
2512
2513 if ( la->LigatureAttach )
2514 {
2515 count = la->LigatureCount;
2516 lat = la->LigatureAttach;
2517
2518 for ( n = 0; n < count; n++ )
2519 Free_LigatureAttach( &lat[n], num_classes );
2520
2521 FREE( lat );
2522 }
2523 }
2524
2525
2526 /* MarkLigPosFormat1 */
2527
2528 static HB_Error Load_MarkLigPos( HB_GPOS_SubTable* st,
2529 HB_Stream stream )
2530 {
2531 HB_Error error;
2532 HB_MarkLigPos* mlp = &st->marklig;
2533
2534 HB_UInt cur_offset, new_offset, base_offset;
2535
2536
2537 base_offset = FILE_Pos();
2538
2539 if ( ACCESS_Frame( 4L ) )
2540 return error;
2541
2542 mlp->PosFormat = GET_UShort();
2543 new_offset = GET_UShort() + base_offset;
2544
2545 FORGET_Frame();
2546
2547 cur_offset = FILE_Pos();
2548 if ( FILE_Seek( new_offset ) ||
2549 ( error = _HB_OPEN_Load_Coverage( &mlp->MarkCoverage, stream ) ) != HB_Err_Ok )
2550 return error;
2551 (void)FILE_Seek( cur_offset );
2552
2553 if ( ACCESS_Frame( 2L ) )
2554 goto Fail3;
2555
2556 new_offset = GET_UShort() + base_offset;
2557
2558 FORGET_Frame();
2559
2560 cur_offset = FILE_Pos();
2561 if ( FILE_Seek( new_offset ) ||
2562 ( error = _HB_OPEN_Load_Coverage( &mlp->LigatureCoverage,
2563 stream ) ) != HB_Err_Ok )
2564 goto Fail3;
2565 (void)FILE_Seek( cur_offset );
2566
2567 if ( ACCESS_Frame( 4L ) )
2568 goto Fail2;
2569
2570 mlp->ClassCount = GET_UShort();
2571 new_offset = GET_UShort() + base_offset;
2572
2573 FORGET_Frame();
2574
2575 cur_offset = FILE_Pos();
2576 if ( FILE_Seek( new_offset ) ||
2577 ( error = Load_MarkArray( &mlp->MarkArray, stream ) ) != HB_Err_Ok )
2578 goto Fail2;
2579 (void)FILE_Seek( cur_offset );
2580
2581 if ( ACCESS_Frame( 2L ) )
2582 goto Fail1;
2583
2584 new_offset = GET_UShort() + base_offset;
2585
2586 FORGET_Frame();
2587
2588 cur_offset = FILE_Pos();
2589 if ( FILE_Seek( new_offset ) ||
2590 ( error = Load_LigatureArray( &mlp->LigatureArray, mlp->ClassCount,
2591 stream ) ) != HB_Err_Ok )
2592 goto Fail1;
2593
2594 return HB_Err_Ok;
2595
2596 Fail1:
2597 Free_MarkArray( &mlp->MarkArray );
2598
2599 Fail2:
2600 _HB_OPEN_Free_Coverage( &mlp->LigatureCoverage );
2601
2602 Fail3:
2603 _HB_OPEN_Free_Coverage( &mlp->MarkCoverage );
2604 return error;
2605 }
2606
2607
2608 static void Free_MarkLigPos( HB_GPOS_SubTable* st)
2609 {
2610 HB_MarkLigPos* mlp = &st->marklig;
2611
2612 Free_LigatureArray( &mlp->LigatureArray, mlp->ClassCount );
2613 Free_MarkArray( &mlp->MarkArray );
2614 _HB_OPEN_Free_Coverage( &mlp->LigatureCoverage );
2615 _HB_OPEN_Free_Coverage( &mlp->MarkCoverage );
2616 }
2617
2618
2619 static HB_Error Lookup_MarkLigPos( GPOS_Instance* gpi,
2620 HB_GPOS_SubTable* st,
2621 HB_Buffer buffer,
2622 HB_UShort flags,
2623 HB_UShort context_length,
2624 int nesting_level )
2625 {
2626 HB_UShort i, j, mark_index, lig_index, property, class;
2627 HB_UShort mark_glyph;
2628 HB_Fixed x_mark_value, y_mark_value, x_lig_value, y_lig_value;
2629 HB_Error error;
2630 HB_GPOSHeader* gpos = gpi->gpos;
2631 HB_MarkLigPos* mlp = &st->marklig;
2632
2633 HB_MarkArray* ma;
2634 HB_LigatureArray* la;
2635 HB_LigatureAttach* lat;
2636 HB_ComponentRecord* cr;
2637 HB_UShort comp_index;
2638 HB_Anchor* mark_anchor;
2639 HB_Anchor* lig_anchor;
2640
2641 HB_Position o;
2642
2643 HB_UNUSED(nesting_level);
2644
2645 if ( context_length != 0xFFFF && context_length < 1 )
2646 return HB_Err_Not_Covered;
2647
2648 if ( flags & HB_LOOKUP_FLAG_IGNORE_LIGATURES )
2649 return HB_Err_Not_Covered;
2650
2651 mark_glyph = IN_CURGLYPH();
2652
2653 if ( CHECK_Property( gpos->gdef, IN_CURITEM(), flags, &property ) )
2654 return error;
2655
2656 error = _HB_OPEN_Coverage_Index( &mlp->MarkCoverage, mark_glyph, &mark_index );
2657 if ( error )
2658 return error;
2659
2660 /* now we search backwards for a non-mark glyph */
2661
2662 i = 1;
2663 j = buffer->in_pos - 1;
2664
2665 while ( i <= buffer->in_pos )
2666 {
2667 error = HB_GDEF_Get_Glyph_Property( gpos->gdef, IN_GLYPH( j ),
2668 &property );
2669 if ( error )
2670 return error;
2671
2672 if ( !( property == HB_GDEF_MARK || property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS ) )
2673 break;
2674
2675 i++;
2676 j--;
2677 }
2678
2679 /* Similar to Lookup_MarkBasePos(), I suspect that this assertion is
2680 too strong, thus it is commented out. */
2681 #if 0
2682 if ( property != HB_GDEF_LIGATURE )
2683 return HB_Err_Not_Covered;
2684 #endif
2685
2686 if ( i > buffer->in_pos )
2687 return HB_Err_Not_Covered;
2688
2689 error = _HB_OPEN_Coverage_Index( &mlp->LigatureCoverage, IN_GLYPH( j ),
2690 &lig_index );
2691 if ( error )
2692 return error;
2693
2694 ma = &mlp->MarkArray;
2695
2696 if ( mark_index >= ma->MarkCount )
2697 return ERR(HB_Err_Invalid_SubTable);
2698
2699 class = ma->MarkRecord[mark_index].Class;
2700 mark_anchor = &ma->MarkRecord[mark_index].MarkAnchor;
2701
2702 if ( class >= mlp->ClassCount )
2703 return ERR(HB_Err_Invalid_SubTable);
2704
2705 la = &mlp->LigatureArray;
2706
2707 if ( lig_index >= la->LigatureCount )
2708 return ERR(HB_Err_Invalid_SubTable);
2709
2710 lat = &la->LigatureAttach[lig_index];
2711
2712 /* We must now check whether the ligature ID of the current mark glyph
2713 is identical to the ligature ID of the found ligature. If yes, we
2714 can directly use the component index. If not, we attach the mark
2715 glyph to the last component of the ligature. */
2716
2717 if ( IN_LIGID( j ) == IN_LIGID( buffer->in_pos) )
2718 {
2719 comp_index = IN_COMPONENT( buffer->in_pos );
2720 if ( comp_index >= lat->ComponentCount )
2721 return HB_Err_Not_Covered;
2722 }
2723 else
2724 comp_index = lat->ComponentCount - 1;
2725
2726 cr = &lat->ComponentRecord[comp_index];
2727 lig_anchor = &cr->LigatureAnchor[class];
2728
2729 error = Get_Anchor( gpi, mark_anchor, IN_CURGLYPH(),
2730 &x_mark_value, &y_mark_value );
2731 if ( error )
2732 return error;
2733 error = Get_Anchor( gpi, lig_anchor, IN_GLYPH( j ),
2734 &x_lig_value, &y_lig_value );
2735 if ( error )
2736 return error;
2737
2738 /* anchor points are not cumulative */
2739
2740 o = POSITION( buffer->in_pos );
2741
2742 o->x_pos = x_lig_value - x_mark_value;
2743 o->y_pos = y_lig_value - y_mark_value;
2744 o->x_advance = 0;
2745 o->y_advance = 0;
2746 o->back = i;
2747
2748 (buffer->in_pos)++;
2749
2750 return HB_Err_Ok;
2751 }
2752
2753
2754 /* LookupType 6 */
2755
2756 /* Mark2Array */
2757
2758 static HB_Error Load_Mark2Array( HB_Mark2Array* m2a,
2759 HB_UShort num_classes,
2760 HB_Stream stream )
2761 {
2762 HB_Error error;
2763
2764 HB_UShort m, n, count;
2765 HB_UInt cur_offset, new_offset, base_offset;
2766
2767 HB_Mark2Record *m2r;
2768 HB_Anchor *m2an, *m2ans;
2769
2770
2771 base_offset = FILE_Pos();
2772
2773 if ( ACCESS_Frame( 2L ) )
2774 return error;
2775
2776 count = m2a->Mark2Count = GET_UShort();
2777
2778 FORGET_Frame();
2779
2780 m2a->Mark2Record = NULL;
2781
2782 if ( ALLOC_ARRAY( m2a->Mark2Record, count, HB_Mark2Record ) )
2783 return error;
2784
2785 m2r = m2a->Mark2Record;
2786
2787 m2ans = NULL;
2788
2789 if ( ALLOC_ARRAY( m2ans, count * num_classes, HB_Anchor ) )
2790 goto Fail;
2791
2792 for ( m = 0; m < count; m++ )
2793 {
2794 m2an = m2r[m].Mark2Anchor = m2ans + m * num_classes;
2795
2796 for ( n = 0; n < num_classes; n++ )
2797 {
2798 if ( ACCESS_Frame( 2L ) )
2799 goto Fail;
2800
2801 new_offset = GET_UShort() + base_offset;
2802
2803 FORGET_Frame();
2804
2805 if (new_offset == base_offset) {
2806 /* Anchor table not provided. Skip loading.
2807 * Some versions of FreeSans hit this. */
2808 m2an[n].PosFormat = 0;
2809 continue;
2810 }
2811
2812 cur_offset = FILE_Pos();
2813 if ( FILE_Seek( new_offset ) ||
2814 ( error = Load_Anchor( &m2an[n], stream ) ) != HB_Err_Ok )
2815 goto Fail;
2816 (void)FILE_Seek( cur_offset );
2817 }
2818 }
2819
2820 return HB_Err_Ok;
2821
2822 Fail:
2823 FREE( m2ans );
2824 FREE( m2r );
2825 return error;
2826 }
2827
2828
2829 static void Free_Mark2Array( HB_Mark2Array* m2a,
2830 HB_UShort num_classes )
2831 {
2832 HB_Mark2Record *m2r;
2833 HB_Anchor *m2ans;
2834
2835 HB_UNUSED(num_classes);
2836
2837 if ( m2a->Mark2Record )
2838 {
2839 m2r = m2a->Mark2Record;
2840
2841 if ( m2a->Mark2Count )
2842 {
2843 m2ans = m2r[0].Mark2Anchor;
2844 FREE( m2ans );
2845 }
2846
2847 FREE( m2r );
2848 }
2849 }
2850
2851
2852 /* MarkMarkPosFormat1 */
2853
2854 static HB_Error Load_MarkMarkPos( HB_GPOS_SubTable* st,
2855 HB_Stream stream )
2856 {
2857 HB_Error error;
2858 HB_MarkMarkPos* mmp = &st->markmark;
2859
2860 HB_UInt cur_offset, new_offset, base_offset;
2861
2862
2863 base_offset = FILE_Pos();
2864
2865 if ( ACCESS_Frame( 4L ) )
2866 return error;
2867
2868 mmp->PosFormat = GET_UShort();
2869 new_offset = GET_UShort() + base_offset;
2870
2871 FORGET_Frame();
2872
2873 cur_offset = FILE_Pos();
2874 if ( FILE_Seek( new_offset ) ||
2875 ( error = _HB_OPEN_Load_Coverage( &mmp->Mark1Coverage,
2876 stream ) ) != HB_Err_Ok )
2877 return error;
2878 (void)FILE_Seek( cur_offset );
2879
2880 if ( ACCESS_Frame( 2L ) )
2881 goto Fail3;
2882
2883 new_offset = GET_UShort() + base_offset;
2884
2885 FORGET_Frame();
2886
2887 cur_offset = FILE_Pos();
2888 if ( FILE_Seek( new_offset ) ||
2889 ( error = _HB_OPEN_Load_Coverage( &mmp->Mark2Coverage,
2890 stream ) ) != HB_Err_Ok )
2891 goto Fail3;
2892 (void)FILE_Seek( cur_offset );
2893
2894 if ( ACCESS_Frame( 4L ) )
2895 goto Fail2;
2896
2897 mmp->ClassCount = GET_UShort();
2898 new_offset = GET_UShort() + base_offset;
2899
2900 FORGET_Frame();
2901
2902 cur_offset = FILE_Pos();
2903 if ( FILE_Seek( new_offset ) ||
2904 ( error = Load_MarkArray( &mmp->Mark1Array, stream ) ) != HB_Err_Ok )
2905 goto Fail2;
2906 (void)FILE_Seek( cur_offset );
2907
2908 if ( ACCESS_Frame( 2L ) )
2909 goto Fail1;
2910
2911 new_offset = GET_UShort() + base_offset;
2912
2913 FORGET_Frame();
2914
2915 cur_offset = FILE_Pos();
2916 if ( FILE_Seek( new_offset ) ||
2917 ( error = Load_Mark2Array( &mmp->Mark2Array, mmp->ClassCount,
2918 stream ) ) != HB_Err_Ok )
2919 goto Fail1;
2920
2921 return HB_Err_Ok;
2922
2923 Fail1:
2924 Free_MarkArray( &mmp->Mark1Array );
2925
2926 Fail2:
2927 _HB_OPEN_Free_Coverage( &mmp->Mark2Coverage );
2928
2929 Fail3:
2930 _HB_OPEN_Free_Coverage( &mmp->Mark1Coverage );
2931 return error;
2932 }
2933
2934
2935 static void Free_MarkMarkPos( HB_GPOS_SubTable* st)
2936 {
2937 HB_MarkMarkPos* mmp = &st->markmark;
2938
2939 Free_Mark2Array( &mmp->Mark2Array, mmp->ClassCount );
2940 Free_MarkArray( &mmp->Mark1Array );
2941 _HB_OPEN_Free_Coverage( &mmp->Mark2Coverage );
2942 _HB_OPEN_Free_Coverage( &mmp->Mark1Coverage );
2943 }
2944
2945
2946 static HB_Error Lookup_MarkMarkPos( GPOS_Instance* gpi,
2947 HB_GPOS_SubTable* st,
2948 HB_Buffer buffer,
2949 HB_UShort flags,
2950 HB_UShort context_length,
2951 int nesting_level )
2952 {
2953 HB_UShort i, j, mark1_index, mark2_index, property, class;
2954 HB_Fixed x_mark1_value, y_mark1_value,
2955 x_mark2_value, y_mark2_value;
2956 HB_Error error;
2957 HB_GPOSHeader* gpos = gpi->gpos;
2958 HB_MarkMarkPos* mmp = &st->markmark;
2959
2960 HB_MarkArray* ma1;
2961 HB_Mark2Array* ma2;
2962 HB_Mark2Record* m2r;
2963 HB_Anchor* mark1_anchor;
2964 HB_Anchor* mark2_anchor;
2965
2966 HB_Position o;
2967
2968 HB_UNUSED(nesting_level);
2969
2970 if ( context_length != 0xFFFF && context_length < 1 )
2971 return HB_Err_Not_Covered;
2972
2973 if ( flags & HB_LOOKUP_FLAG_IGNORE_MARKS )
2974 return HB_Err_Not_Covered;
2975
2976 if ( CHECK_Property( gpos->gdef, IN_CURITEM(),
2977 flags, &property ) )
2978 return error;
2979
2980 error = _HB_OPEN_Coverage_Index( &mmp->Mark1Coverage, IN_CURGLYPH(),
2981 &mark1_index );
2982 if ( error )
2983 return error;
2984
2985 /* now we search backwards for a suitable mark glyph until a non-mark
2986 glyph */
2987
2988 if ( buffer->in_pos == 0 )
2989 return HB_Err_Not_Covered;
2990
2991 i = 1;
2992 j = buffer->in_pos - 1;
2993 while ( i <= buffer->in_pos )
2994 {
2995 error = HB_GDEF_Get_Glyph_Property( gpos->gdef, IN_GLYPH( j ),
2996 &property );
2997 if ( error )
2998 return error;
2999
3000 if ( !( property == HB_GDEF_MARK || property & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS ) )
3001 return HB_Err_Not_Covered;
3002
3003 if ( flags & HB_LOOKUP_FLAG_IGNORE_SPECIAL_MARKS )
3004 {
3005 if ( property == (flags & 0xFF00) )
3006 break;
3007 }
3008 else
3009 break;
3010
3011 i++;
3012 j--;
3013 }
3014
3015 if ( i > buffer->in_pos )
3016 return HB_Err_Not_Covered;
3017
3018 error = _HB_OPEN_Coverage_Index( &mmp->Mark2Coverage, IN_GLYPH( j ),
3019 &mark2_index );
3020 if ( error )
3021 return error;
3022
3023 ma1 = &mmp->Mark1Array;
3024
3025 if ( mark1_index >= ma1->MarkCount )
3026 return ERR(HB_Err_Invalid_SubTable);
3027
3028 class = ma1->MarkRecord[mark1_index].Class;
3029 mark1_anchor = &ma1->MarkRecord[mark1_index].MarkAnchor;
3030
3031 if ( class >= mmp->ClassCount )
3032 return ERR(HB_Err_Invalid_SubTable);
3033
3034 ma2 = &mmp->Mark2Array;
3035
3036 if ( mark2_index >= ma2->Mark2Count )
3037 return ERR(HB_Err_Invalid_SubTable);
3038
3039 m2r = &ma2->Mark2Record[mark2_index];
3040 mark2_anchor = &m2r->Mark2Anchor[class];
3041
3042 error = Get_Anchor( gpi, mark1_anchor, IN_CURGLYPH(),
3043 &x_mark1_value, &y_mark1_value );
3044 if ( error )
3045 return error;
3046 error = Get_Anchor( gpi, mark2_anchor, IN_GLYPH( j ),
3047 &x_mark2_value, &y_mark2_value );
3048 if ( error )
3049 return error;
3050
3051 /* anchor points are not cumulative */
3052
3053 o = POSITION( buffer->in_pos );
3054
3055 o->x_pos = x_mark2_value - x_mark1_value;
3056 o->y_pos = y_mark2_value - y_mark1_value;
3057 o->x_advance = 0;
3058 o->y_advance = 0;
3059 o->back = 1;
3060
3061 (buffer->in_pos)++;
3062
3063 return HB_Err_Ok;
3064 }
3065
3066
3067 /* Do the actual positioning for a context positioning (either format
3068 7 or 8). This is only called after we've determined that the stream
3069 matches the subrule. */
3070
3071 static HB_Error Do_ContextPos( GPOS_Instance* gpi,
3072 HB_UShort GlyphCount,
3073 HB_UShort PosCount,
3074 HB_PosLookupRecord* pos,
3075 HB_Buffer buffer,
3076 int nesting_level )
3077 {
3078 HB_Error error;
3079 HB_UInt i, old_pos;
3080
3081
3082 i = 0;
3083
3084 while ( i < GlyphCount )
3085 {
3086 if ( PosCount && i == pos->SequenceIndex )
3087 {
3088 old_pos = buffer->in_pos;
3089
3090 /* Do a positioning */
3091
3092 error = GPOS_Do_Glyph_Lookup( gpi, pos->LookupListIndex, buffer,
3093 GlyphCount, nesting_level );
3094
3095 if ( error )
3096 return error;
3097
3098 pos++;
3099 PosCount--;
3100 i += buffer->in_pos - old_pos;
3101 }
3102 else
3103 {
3104 i++;
3105 (buffer->in_pos)++;
3106 }
3107 }
3108
3109 return HB_Err_Ok;
3110 }
3111
3112
3113 /* LookupType 7 */
3114
3115 /* PosRule */
3116
3117 static HB_Error Load_PosRule( HB_PosRule* pr,
3118 HB_Stream stream )
3119 {
3120 HB_Error error;
3121
3122 HB_UShort n, count;
3123 HB_UShort* i;
3124
3125 HB_PosLookupRecord* plr;
3126
3127
3128 if ( ACCESS_Frame( 4L ) )
3129 return error;
3130
3131 pr->GlyphCount = GET_UShort();
3132 pr->PosCount = GET_UShort();
3133
3134 FORGET_Frame();
3135
3136 pr->Input = NULL;
3137
3138 count = pr->GlyphCount - 1; /* only GlyphCount - 1 elements */
3139
3140 if ( ALLOC_ARRAY( pr->Input, count, HB_UShort ) )
3141 return error;
3142
3143 i = pr->Input;
3144
3145 if ( ACCESS_Frame( count * 2L ) )
3146 goto Fail2;
3147
3148 for ( n = 0; n < count; n++ )
3149 i[n] = GET_UShort();
3150
3151 FORGET_Frame();
3152
3153 pr->PosLookupRecord = NULL;
3154
3155 count = pr->PosCount;
3156
3157 if ( ALLOC_ARRAY( pr->PosLookupRecord, count, HB_PosLookupRecord ) )
3158 goto Fail2;
3159
3160 plr = pr->PosLookupRecord;
3161
3162 if ( ACCESS_Frame( count * 4L ) )
3163 goto Fail1;
3164
3165 for ( n = 0; n < count; n++ )
3166 {
3167 plr[n].SequenceIndex = GET_UShort();
3168 plr[n].LookupListIndex = GET_UShort();
3169 }
3170
3171 FORGET_Frame();
3172
3173 return HB_Err_Ok;
3174
3175 Fail1:
3176 FREE( plr );
3177
3178 Fail2:
3179 FREE( i );
3180 return error;
3181 }
3182
3183
3184 static void Free_PosRule( HB_PosRule* pr )
3185 {
3186 FREE( pr->PosLookupRecord );
3187 FREE( pr->Input );
3188 }
3189
3190
3191 /* PosRuleSet */
3192
3193 static HB_Error Load_PosRuleSet( HB_PosRuleSet* prs,
3194 HB_Stream stream )
3195 {
3196 HB_Error error;
3197
3198 HB_UShort n, m, count;
3199 HB_UInt cur_offset, new_offset, base_offset;
3200
3201 HB_PosRule* pr;
3202
3203
3204 base_offset = FILE_Pos();
3205
3206 if ( ACCESS_Frame( 2L ) )
3207 return error;
3208
3209 count = prs->PosRuleCount = GET_UShort();
3210
3211 FORGET_Frame();
3212
3213 prs->PosRule = NULL;
3214
3215 if ( ALLOC_ARRAY( prs->PosRule, count, HB_PosRule ) )
3216 return error;
3217
3218 pr = prs->PosRule;
3219
3220 for ( n = 0; n < count; n++ )
3221 {
3222 if ( ACCESS_Frame( 2L ) )
3223 goto Fail;
3224
3225 new_offset = GET_UShort() + base_offset;
3226
3227 FORGET_Frame();
3228
3229 cur_offset = FILE_Pos();
3230 if ( FILE_Seek( new_offset ) ||
3231 ( error = Load_PosRule( &pr[n], stream ) ) != HB_Err_Ok )
3232 goto Fail;
3233 (void)FILE_Seek( cur_offset );
3234 }
3235
3236 return HB_Err_Ok;
3237
3238 Fail:
3239 for ( m = 0; m < n; m++ )
3240 Free_PosRule( &pr[m] );
3241
3242 FREE( pr );
3243 return error;
3244 }
3245
3246
3247 static void Free_PosRuleSet( HB_PosRuleSet* prs )
3248 {
3249 HB_UShort n, count;
3250
3251 HB_PosRule* pr;
3252
3253
3254 if ( prs->PosRule )
3255 {
3256 count = prs->PosRuleCount;
3257 pr = prs->PosRule;
3258
3259 for ( n = 0; n < count; n++ )
3260 Free_PosRule( &pr[n] );
3261
3262 FREE( pr );
3263 }
3264 }
3265
3266
3267 /* ContextPosFormat1 */
3268
3269 static HB_Error Load_ContextPos1( HB_ContextPosFormat1* cpf1,
3270 HB_Stream stream )
3271 {
3272 HB_Error error;
3273
3274 HB_UShort n, m, count;
3275 HB_UInt cur_offset, new_offset, base_offset;
3276
3277 HB_PosRuleSet* prs;
3278
3279
3280 base_offset = FILE_Pos() - 2L;
3281
3282 if ( ACCESS_Frame( 2L ) )
3283 return error;
3284
3285 new_offset = GET_UShort() + base_offset;
3286
3287 FORGET_Frame();
3288
3289 cur_offset = FILE_Pos();
3290 if ( FILE_Seek( new_offset ) ||
3291 ( error = _HB_OPEN_Load_Coverage( &cpf1->Coverage, stream ) ) != HB_Err_Ok )
3292 return error;
3293 (void)FILE_Seek( cur_offset );
3294
3295 if ( ACCESS_Frame( 2L ) )
3296 goto Fail2;
3297
3298 count = cpf1->PosRuleSetCount = GET_UShort();
3299
3300 FORGET_Frame();
3301
3302 cpf1->PosRuleSet = NULL;
3303
3304 if ( ALLOC_ARRAY( cpf1->PosRuleSet, count, HB_PosRuleSet ) )
3305 goto Fail2;
3306
3307 prs = cpf1->PosRuleSet;
3308
3309 for ( n = 0; n < count; n++ )
3310 {
3311 if ( ACCESS_Frame( 2L ) )
3312 goto Fail1;
3313
3314 new_offset = GET_UShort() + base_offset;
3315
3316 FORGET_Frame();
3317
3318 cur_offset = FILE_Pos();
3319 if ( FILE_Seek( new_offset ) ||
3320 ( error = Load_PosRuleSet( &prs[n], stream ) ) != HB_Err_Ok )
3321 goto Fail1;
3322 (void)FILE_Seek( cur_offset );
3323 }
3324
3325 return HB_Err_Ok;
3326
3327 Fail1:
3328 for ( m = 0; m < n; m++ )
3329 Free_PosRuleSet( &prs[m] );
3330
3331 FREE( prs );
3332
3333 Fail2:
3334 _HB_OPEN_Free_Coverage( &cpf1->Coverage );
3335 return error;
3336 }
3337
3338
3339 static void Free_ContextPos1( HB_ContextPosFormat1* cpf1 )
3340 {
3341 HB_UShort n, count;
3342
3343 HB_PosRuleSet* prs;
3344
3345
3346 if ( cpf1->PosRuleSet )
3347 {
3348 count = cpf1->PosRuleSetCount;
3349 prs = cpf1->PosRuleSet;
3350
3351 for ( n = 0; n < count; n++ )
3352 Free_PosRuleSet( &prs[n] );
3353
3354 FREE( prs );
3355 }
3356
3357 _HB_OPEN_Free_Coverage( &cpf1->Coverage );
3358 }
3359
3360
3361 /* PosClassRule */
3362
3363 static HB_Error Load_PosClassRule( HB_ContextPosFormat2* cpf2,
3364 HB_PosClassRule* pcr,
3365 HB_Stream stream )
3366 {
3367 HB_Error error;
3368
3369 HB_UShort n, count;
3370
3371 HB_UShort* c;
3372 HB_PosLookupRecord* plr;
3373
3374
3375 if ( ACCESS_Frame( 4L ) )
3376 return error;
3377
3378 pcr->GlyphCount = GET_UShort();
3379 pcr->PosCount = GET_UShort();
3380
3381 FORGET_Frame();
3382
3383 if ( pcr->GlyphCount > cpf2->MaxContextLength )
3384 cpf2->MaxContextLength = pcr->GlyphCount;
3385
3386 pcr->Class = NULL;
3387
3388 count = pcr->GlyphCount - 1; /* only GlyphCount - 1 elements */
3389
3390 if ( ALLOC_ARRAY( pcr->Class, count, HB_UShort ) )
3391 return error;
3392
3393 c = pcr->Class;
3394
3395 if ( ACCESS_Frame( count * 2L ) )
3396 goto Fail2;
3397
3398 for ( n = 0; n < count; n++ )
3399 c[n] = GET_UShort();
3400
3401 FORGET_Frame();
3402
3403 pcr->PosLookupRecord = NULL;
3404
3405 count = pcr->PosCount;
3406
3407 if ( ALLOC_ARRAY( pcr->PosLookupRecord, count, HB_PosLookupRecord ) )
3408 goto Fail2;
3409
3410 plr = pcr->PosLookupRecord;
3411
3412 if ( ACCESS_Frame( count * 4L ) )
3413 goto Fail1;
3414
3415 for ( n = 0; n < count; n++ )
3416 {
3417 plr[n].SequenceIndex = GET_UShort();
3418 plr[n].LookupListIndex = GET_UShort();
3419 }
3420
3421 FORGET_Frame();
3422
3423 return HB_Err_Ok;
3424
3425 Fail1:
3426 FREE( plr );
3427
3428 Fail2:
3429 FREE( c );
3430 return error;
3431 }
3432
3433
3434 static void Free_PosClassRule( HB_PosClassRule* pcr )
3435 {
3436 FREE( pcr->PosLookupRecord );
3437 FREE( pcr->Class );
3438 }
3439
3440
3441 /* PosClassSet */
3442
3443 static HB_Error Load_PosClassSet( HB_ContextPosFormat2* cpf2,
3444 HB_PosClassSet* pcs,
3445 HB_Stream stream )
3446 {
3447 HB_Error error;
3448
3449 HB_UShort n, m, count;
3450 HB_UInt cur_offset, new_offset, base_offset;
3451
3452 HB_PosClassRule* pcr;
3453
3454
3455 base_offset = FILE_Pos();
3456
3457 if ( ACCESS_Frame( 2L ) )
3458 return error;
3459
3460 count = pcs->PosClassRuleCount = GET_UShort();
3461
3462 FORGET_Frame();
3463
3464 pcs->PosClassRule = NULL;
3465
3466 if ( ALLOC_ARRAY( pcs->PosClassRule, count, HB_PosClassRule ) )
3467 return error;
3468
3469 pcr = pcs->PosClassRule;
3470
3471 for ( n = 0; n < count; n++ )
3472 {
3473 if ( ACCESS_Frame( 2L ) )
3474 goto Fail;
3475
3476 new_offset = GET_UShort() + base_offset;
3477
3478 FORGET_Frame();
3479
3480 cur_offset = FILE_Pos();
3481 if ( FILE_Seek( new_offset ) ||
3482 ( error = Load_PosClassRule( cpf2, &pcr[n],
3483 stream ) ) != HB_Err_Ok )
3484 goto Fail;
3485 (void)FILE_Seek( cur_offset );
3486 }
3487
3488 return HB_Err_Ok;
3489
3490 Fail:
3491 for ( m = 0; m < n; m++ )
3492 Free_PosClassRule( &pcr[m] );
3493
3494 FREE( pcr );
3495 return error;
3496 }
3497
3498
3499 static void Free_PosClassSet( HB_PosClassSet* pcs )
3500 {
3501 HB_UShort n, count;
3502
3503 HB_PosClassRule* pcr;
3504
3505
3506 if ( pcs->PosClassRule )
3507 {
3508 count = pcs->PosClassRuleCount;
3509 pcr = pcs->PosClassRule;
3510
3511 for ( n = 0; n < count; n++ )
3512 Free_PosClassRule( &pcr[n] );
3513
3514 FREE( pcr );
3515 }
3516 }
3517
3518
3519 /* ContextPosFormat2 */
3520
3521 static HB_Error Load_ContextPos2( HB_ContextPosFormat2* cpf2,
3522 HB_Stream stream )
3523 {
3524 HB_Error error;
3525
3526 HB_UShort n, m, count;
3527 HB_UInt cur_offset, new_offset, base_offset;
3528
3529 HB_PosClassSet* pcs;
3530
3531
3532 base_offset = FILE_Pos() - 2;
3533
3534 if ( ACCESS_Frame( 2L ) )
3535 return error;
3536
3537 new_offset = GET_UShort() + base_offset;
3538
3539 FORGET_Frame();
3540
3541 cur_offset = FILE_Pos();
3542 if ( FILE_Seek( new_offset ) ||
3543 ( error = _HB_OPEN_Load_Coverage( &cpf2->Coverage, stream ) ) != HB_Err_Ok )
3544 return error;
3545 (void)FILE_Seek( cur_offset );
3546
3547 if ( ACCESS_Frame( 4L ) )
3548 goto Fail3;
3549
3550 new_offset = GET_UShort() + base_offset;
3551
3552 /* `PosClassSetCount' is the upper limit for class values, thus we
3553 read it now to make an additional safety check. */
3554
3555 count = cpf2->PosClassSetCount = GET_UShort();
3556
3557 FORGET_Frame();
3558
3559 cur_offset = FILE_Pos();
3560 if ( FILE_Seek( new_offset ) ||
3561 ( error = _HB_OPEN_Load_ClassDefinition( &cpf2->ClassDef, count,
3562 stream ) ) != HB_Err_Ok )
3563 goto Fail3;
3564 (void)FILE_Seek( cur_offset );
3565
3566 cpf2->PosClassSet = NULL;
3567 cpf2->MaxContextLength = 0;
3568
3569 if ( ALLOC_ARRAY( cpf2->PosClassSet, count, HB_PosClassSet ) )
3570 goto Fail2;
3571
3572 pcs = cpf2->PosClassSet;
3573
3574 for ( n = 0; n < count; n++ )
3575 {
3576 if ( ACCESS_Frame( 2L ) )
3577 goto Fail1;
3578
3579 new_offset = GET_UShort() + base_offset;
3580
3581 FORGET_Frame();
3582
3583 if ( new_offset != base_offset ) /* not a NULL offset */
3584 {
3585 cur_offset = FILE_Pos();
3586 if ( FILE_Seek( new_offset ) ||
3587 ( error = Load_PosClassSet( cpf2, &pcs[n],
3588 stream ) ) != HB_Err_Ok )
3589 goto Fail1;
3590 (void)FILE_Seek( cur_offset );
3591 }
3592 else
3593 {
3594 /* we create a PosClassSet table with no entries */
3595
3596 cpf2->PosClassSet[n].PosClassRuleCount = 0;
3597 cpf2->PosClassSet[n].PosClassRule = NULL;
3598 }
3599 }
3600
3601 return HB_Err_Ok;
3602
3603 Fail1:
3604 for ( m = 0; m < n; n++ )
3605 Free_PosClassSet( &pcs[m] );
3606
3607 FREE( pcs );
3608
3609 Fail2:
3610 _HB_OPEN_Free_ClassDefinition( &cpf2->ClassDef );
3611
3612 Fail3:
3613 _HB_OPEN_Free_Coverage( &cpf2->Coverage );
3614 return error;
3615 }
3616
3617
3618 static void Free_ContextPos2( HB_ContextPosFormat2* cpf2 )
3619 {
3620 HB_UShort n, count;
3621
3622 HB_PosClassSet* pcs;
3623
3624
3625 if ( cpf2->PosClassSet )
3626 {
3627 count = cpf2->PosClassSetCount;
3628 pcs = cpf2->PosClassSet;
3629
3630 for ( n = 0; n < count; n++ )
3631 Free_PosClassSet( &pcs[n] );
3632
3633 FREE( pcs );
3634 }
3635
3636 _HB_OPEN_Free_ClassDefinition( &cpf2->ClassDef );
3637 _HB_OPEN_Free_Coverage( &cpf2->Coverage );
3638 }
3639
3640
3641 /* ContextPosFormat3 */
3642
3643 static HB_Error Load_ContextPos3( HB_ContextPosFormat3* cpf3,
3644 HB_Stream stream )
3645 {
3646 HB_Error error;
3647
3648 HB_UShort n, count;
3649 HB_UInt cur_offset, new_offset, base_offset;
3650
3651 HB_Coverage* c;
3652 HB_PosLookupRecord* plr;
3653
3654
3655 base_offset = FILE_Pos() - 2L;
3656
3657 if ( ACCESS_Frame( 4L ) )
3658 return error;
3659
3660 cpf3->GlyphCount = GET_UShort();
3661 cpf3->PosCount = GET_UShort();
3662
3663 FORGET_Frame();
3664
3665 cpf3->Coverage = NULL;
3666
3667 count = cpf3->GlyphCount;
3668
3669 if ( ALLOC_ARRAY( cpf3->Coverage, count, HB_Coverage ) )
3670 return error;
3671
3672 c = cpf3->Coverage;
3673
3674 for ( n = 0; n < count; n++ )
3675 {
3676 if ( ACCESS_Frame( 2L ) )
3677 goto Fail2;
3678
3679 new_offset = GET_UShort() + base_offset;
3680
3681 FORGET_Frame();
3682
3683 cur_offset = FILE_Pos();
3684 if ( FILE_Seek( new_offset ) ||
3685 ( error = _HB_OPEN_Load_Coverage( &c[n], stream ) ) != HB_Err_Ok )
3686 goto Fail2;
3687 (void)FILE_Seek( cur_offset );
3688 }
3689
3690 cpf3->PosLookupRecord = NULL;
3691
3692 count = cpf3->PosCount;
3693
3694 if ( ALLOC_ARRAY( cpf3->PosLookupRecord, count, HB_PosLookupRecord ) )
3695 goto Fail2;
3696
3697 plr = cpf3->PosLookupRecord;
3698
3699 if ( ACCESS_Frame( count * 4L ) )
3700 goto Fail1;
3701
3702 for ( n = 0; n < count; n++ )
3703 {
3704 plr[n].SequenceIndex = GET_UShort();
3705 plr[n].LookupListIndex = GET_UShort();
3706 }
3707
3708 FORGET_Frame();
3709
3710 return HB_Err_Ok;
3711
3712 Fail1:
3713 FREE( plr );
3714
3715 Fail2:
3716 for ( n = 0; n < count; n++ )
3717 _HB_OPEN_Free_Coverage( &c[n] );
3718
3719 FREE( c );
3720 return error;
3721 }
3722
3723
3724 static void Free_ContextPos3( HB_ContextPosFormat3* cpf3 )
3725 {
3726 HB_UShort n, count;
3727
3728 HB_Coverage* c;
3729
3730
3731 FREE( cpf3->PosLookupRecord );
3732
3733 if ( cpf3->Coverage )
3734 {
3735 count = cpf3->GlyphCount;
3736 c = cpf3->Coverage;
3737
3738 for ( n = 0; n < count; n++ )
3739 _HB_OPEN_Free_Coverage( &c[n] );
3740
3741 FREE( c );
3742 }
3743 }
3744
3745
3746 /* ContextPos */
3747
3748 static HB_Error Load_ContextPos( HB_GPOS_SubTable* st,
3749 HB_Stream stream )
3750 {
3751 HB_Error error;
3752 HB_ContextPos* cp = &st->context;
3753
3754
3755 if ( ACCESS_Frame( 2L ) )
3756 return error;
3757
3758 cp->PosFormat = GET_UShort();
3759
3760 FORGET_Frame();
3761
3762 switch ( cp->PosFormat )
3763 {
3764 case 1:
3765 return Load_ContextPos1( &cp->cpf.cpf1, stream );
3766
3767 case 2:
3768 return Load_ContextPos2( &cp->cpf.cpf2, stream );
3769
3770 case 3:
3771 return Load_ContextPos3( &cp->cpf.cpf3, stream );
3772
3773 default:
3774 return ERR(HB_Err_Invalid_SubTable_Format);
3775 }
3776
3777 return HB_Err_Ok; /* never reached */
3778 }
3779
3780
3781 static void Free_ContextPos( HB_GPOS_SubTable* st )
3782 {
3783 HB_ContextPos* cp = &st->context;
3784
3785 switch ( cp->PosFormat )
3786 {
3787 case 1: Free_ContextPos1( &cp->cpf.cpf1 ); break;
3788 case 2: Free_ContextPos2( &cp->cpf.cpf2 ); break;
3789 case 3: Free_ContextPos3( &cp->cpf.cpf3 ); break;
3790 default: break;
3791 }
3792 }
3793
3794
3795 static HB_Error Lookup_ContextPos1( GPOS_Instance* gpi,
3796 HB_ContextPosFormat1* cpf1,
3797 HB_Buffer buffer,
3798 HB_UShort flags,
3799 HB_UShort context_length,
3800 int nesting_level )
3801 {
3802 HB_UShort index, property;
3803 HB_UShort i, j, k, numpr;
3804 HB_Error error;
3805 HB_GPOSHeader* gpos = gpi->gpos;
3806
3807 HB_PosRule* pr;
3808 HB_GDEFHeader* gdef;
3809
3810
3811 gdef = gpos->gdef;
3812
3813 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
3814 return error;
3815
3816 error = _HB_OPEN_Coverage_Index( &cpf1->Coverage, IN_CURGLYPH(), &index );
3817 if ( error )
3818 return error;
3819
3820 pr = cpf1->PosRuleSet[index].PosRule;
3821 numpr = cpf1->PosRuleSet[index].PosRuleCount;
3822
3823 for ( k = 0; k < numpr; k++ )
3824 {
3825 if ( context_length != 0xFFFF && context_length < pr[k].GlyphCount )
3826 goto next_posrule;
3827
3828 if ( buffer->in_pos + pr[k].GlyphCount > buffer->in_length )
3829 goto next_posrule; /* context is too long */
3830
3831 for ( i = 1, j = buffer->in_pos + 1; i < pr[k].GlyphCount; i++, j++ )
3832 {
3833 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
3834 {
3835 if ( error && error != HB_Err_Not_Covered )
3836 return error;
3837
3838 if ( j + pr[k].GlyphCount - i == (HB_Int)buffer->in_length )
3839 goto next_posrule;
3840 j++;
3841 }
3842
3843 if ( IN_GLYPH( j ) != pr[k].Input[i - 1] )
3844 goto next_posrule;
3845 }
3846
3847 return Do_ContextPos( gpi, pr[k].GlyphCount,
3848 pr[k].PosCount, pr[k].PosLookupRecord,
3849 buffer,
3850 nesting_level );
3851
3852 next_posrule:
3853 ;
3854 }
3855
3856 return HB_Err_Not_Covered;
3857 }
3858
3859
3860 static HB_Error Lookup_ContextPos2( GPOS_Instance* gpi,
3861 HB_ContextPosFormat2* cpf2,
3862 HB_Buffer buffer,
3863 HB_UShort flags,
3864 HB_UShort context_length,
3865 int nesting_level )
3866 {
3867 HB_UShort index, property;
3868 HB_Error error;
3869 HB_UShort i, j, k, known_classes;
3870
3871 HB_UShort* classes;
3872 HB_UShort* cl;
3873 HB_GPOSHeader* gpos = gpi->gpos;
3874
3875 HB_PosClassSet* pcs;
3876 HB_PosClassRule* pr;
3877 HB_GDEFHeader* gdef;
3878
3879
3880 gdef = gpos->gdef;
3881
3882 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
3883 return error;
3884
3885 /* Note: The coverage table in format 2 doesn't give an index into
3886 anything. It just lets us know whether or not we need to
3887 do any lookup at all. */
3888
3889 error = _HB_OPEN_Coverage_Index( &cpf2->Coverage, IN_CURGLYPH(), &index );
3890 if ( error )
3891 return error;
3892
3893 if (cpf2->MaxContextLength < 1)
3894 return HB_Err_Not_Covered;
3895
3896 if ( ALLOC_ARRAY( classes, cpf2->MaxContextLength, HB_UShort ) )
3897 return error;
3898
3899 error = _HB_OPEN_Get_Class( &cpf2->ClassDef, IN_CURGLYPH(),
3900 &classes[0], NULL );
3901 if ( error && error != HB_Err_Not_Covered )
3902 goto End;
3903 known_classes = 0;
3904
3905 pcs = &cpf2->PosClassSet[classes[0]];
3906 if ( !pcs )
3907 {
3908 error = ERR(HB_Err_Invalid_SubTable);
3909 goto End;
3910 }
3911
3912 for ( k = 0; k < pcs->PosClassRuleCount; k++ )
3913 {
3914 pr = &pcs->PosClassRule[k];
3915
3916 if ( context_length != 0xFFFF && context_length < pr->GlyphCount )
3917 goto next_posclassrule;
3918
3919 if ( buffer->in_pos + pr->GlyphCount > buffer->in_length )
3920 goto next_posclassrule; /* context is too long */
3921
3922 cl = pr->Class;
3923
3924 /* Start at 1 because [0] is implied */
3925
3926 for ( i = 1, j = buffer->in_pos + 1; i < pr->GlyphCount; i++, j++ )
3927 {
3928 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
3929 {
3930 if ( error && error != HB_Err_Not_Covered )
3931 goto End;
3932
3933 if ( j + pr->GlyphCount - i == (HB_Int)buffer->in_length )
3934 goto next_posclassrule;
3935 j++;
3936 }
3937
3938 if ( i > known_classes )
3939 {
3940 /* Keeps us from having to do this for each rule */
3941
3942 error = _HB_OPEN_Get_Class( &cpf2->ClassDef, IN_GLYPH( j ), &classes[i], NULL );
3943 if ( error && error != HB_Err_Not_Covered )
3944 goto End;
3945 known_classes = i;
3946 }
3947
3948 if ( cl[i - 1] != classes[i] )
3949 goto next_posclassrule;
3950 }
3951
3952 error = Do_ContextPos( gpi, pr->GlyphCount,
3953 pr->PosCount, pr->PosLookupRecord,
3954 buffer,
3955 nesting_level );
3956 goto End;
3957
3958 next_posclassrule:
3959 ;
3960 }
3961
3962 error = HB_Err_Not_Covered;
3963
3964 End:
3965 FREE( classes );
3966 return error;
3967 }
3968
3969
3970 static HB_Error Lookup_ContextPos3( GPOS_Instance* gpi,
3971 HB_ContextPosFormat3* cpf3,
3972 HB_Buffer buffer,
3973 HB_UShort flags,
3974 HB_UShort context_length,
3975 int nesting_level )
3976 {
3977 HB_Error error;
3978 HB_UShort index, i, j, property;
3979 HB_GPOSHeader* gpos = gpi->gpos;
3980
3981 HB_Coverage* c;
3982 HB_GDEFHeader* gdef;
3983
3984
3985 gdef = gpos->gdef;
3986
3987 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
3988 return error;
3989
3990 if ( context_length != 0xFFFF && context_length < cpf3->GlyphCount )
3991 return HB_Err_Not_Covered;
3992
3993 if ( buffer->in_pos + cpf3->GlyphCount > buffer->in_length )
3994 return HB_Err_Not_Covered; /* context is too long */
3995
3996 c = cpf3->Coverage;
3997
3998 for ( i = 1, j = 1; i < cpf3->GlyphCount; i++, j++ )
3999 {
4000 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
4001 {
4002 if ( error && error != HB_Err_Not_Covered )
4003 return error;
4004
4005 if ( j + cpf3->GlyphCount - i == (HB_Int)buffer->in_length )
4006 return HB_Err_Not_Covered;
4007 j++;
4008 }
4009
4010 error = _HB_OPEN_Coverage_Index( &c[i], IN_GLYPH( j ), &index );
4011 if ( error )
4012 return error;
4013 }
4014
4015 return Do_ContextPos( gpi, cpf3->GlyphCount,
4016 cpf3->PosCount, cpf3->PosLookupRecord,
4017 buffer,
4018 nesting_level );
4019 }
4020
4021
4022 static HB_Error Lookup_ContextPos( GPOS_Instance* gpi,
4023 HB_GPOS_SubTable* st,
4024 HB_Buffer buffer,
4025 HB_UShort flags,
4026 HB_UShort context_length,
4027 int nesting_level )
4028 {
4029 HB_ContextPos* cp = &st->context;
4030
4031 switch ( cp->PosFormat )
4032 {
4033 case 1:
4034 return Lookup_ContextPos1( gpi, &cp->cpf.cpf1, buffer,
4035 flags, context_length, nesting_level );
4036
4037 case 2:
4038 return Lookup_ContextPos2( gpi, &cp->cpf.cpf2, buffer,
4039 flags, context_length, nesting_level );
4040
4041 case 3:
4042 return Lookup_ContextPos3( gpi, &cp->cpf.cpf3, buffer,
4043 flags, context_length, nesting_level );
4044
4045 default:
4046 return ERR(HB_Err_Invalid_SubTable_Format);
4047 }
4048
4049 return HB_Err_Ok; /* never reached */
4050 }
4051
4052
4053 /* LookupType 8 */
4054
4055 /* ChainPosRule */
4056
4057 static HB_Error Load_ChainPosRule( HB_ChainPosRule* cpr,
4058 HB_Stream stream )
4059 {
4060 HB_Error error;
4061
4062 HB_UShort n, count;
4063 HB_UShort* b;
4064 HB_UShort* i;
4065 HB_UShort* l;
4066
4067 HB_PosLookupRecord* plr;
4068
4069
4070 if ( ACCESS_Frame( 2L ) )
4071 return error;
4072
4073 cpr->BacktrackGlyphCount = GET_UShort();
4074
4075 FORGET_Frame();
4076
4077 cpr->Backtrack = NULL;
4078
4079 count = cpr->BacktrackGlyphCount;
4080
4081 if ( ALLOC_ARRAY( cpr->Backtrack, count, HB_UShort ) )
4082 return error;
4083
4084 b = cpr->Backtrack;
4085
4086 if ( ACCESS_Frame( count * 2L ) )
4087 goto Fail4;
4088
4089 for ( n = 0; n < count; n++ )
4090 b[n] = GET_UShort();
4091
4092 FORGET_Frame();
4093
4094 if ( ACCESS_Frame( 2L ) )
4095 goto Fail4;
4096
4097 cpr->InputGlyphCount = GET_UShort();
4098
4099 FORGET_Frame();
4100
4101 cpr->Input = NULL;
4102
4103 count = cpr->InputGlyphCount - 1; /* only InputGlyphCount - 1 elements */
4104
4105 if ( ALLOC_ARRAY( cpr->Input, count, HB_UShort ) )
4106 goto Fail4;
4107
4108 i = cpr->Input;
4109
4110 if ( ACCESS_Frame( count * 2L ) )
4111 goto Fail3;
4112
4113 for ( n = 0; n < count; n++ )
4114 i[n] = GET_UShort();
4115
4116 FORGET_Frame();
4117
4118 if ( ACCESS_Frame( 2L ) )
4119 goto Fail3;
4120
4121 cpr->LookaheadGlyphCount = GET_UShort();
4122
4123 FORGET_Frame();
4124
4125 cpr->Lookahead = NULL;
4126
4127 count = cpr->LookaheadGlyphCount;
4128
4129 if ( ALLOC_ARRAY( cpr->Lookahead, count, HB_UShort ) )
4130 goto Fail3;
4131
4132 l = cpr->Lookahead;
4133
4134 if ( ACCESS_Frame( count * 2L ) )
4135 goto Fail2;
4136
4137 for ( n = 0; n < count; n++ )
4138 l[n] = GET_UShort();
4139
4140 FORGET_Frame();
4141
4142 if ( ACCESS_Frame( 2L ) )
4143 goto Fail2;
4144
4145 cpr->PosCount = GET_UShort();
4146
4147 FORGET_Frame();
4148
4149 cpr->PosLookupRecord = NULL;
4150
4151 count = cpr->PosCount;
4152
4153 if ( ALLOC_ARRAY( cpr->PosLookupRecord, count, HB_PosLookupRecord ) )
4154 goto Fail2;
4155
4156 plr = cpr->PosLookupRecord;
4157
4158 if ( ACCESS_Frame( count * 4L ) )
4159 goto Fail1;
4160
4161 for ( n = 0; n < count; n++ )
4162 {
4163 plr[n].SequenceIndex = GET_UShort();
4164 plr[n].LookupListIndex = GET_UShort();
4165 }
4166
4167 FORGET_Frame();
4168
4169 return HB_Err_Ok;
4170
4171 Fail1:
4172 FREE( plr );
4173
4174 Fail2:
4175 FREE( l );
4176
4177 Fail3:
4178 FREE( i );
4179
4180 Fail4:
4181 FREE( b );
4182 return error;
4183 }
4184
4185
4186 static void Free_ChainPosRule( HB_ChainPosRule* cpr )
4187 {
4188 FREE( cpr->PosLookupRecord );
4189 FREE( cpr->Lookahead );
4190 FREE( cpr->Input );
4191 FREE( cpr->Backtrack );
4192 }
4193
4194
4195 /* ChainPosRuleSet */
4196
4197 static HB_Error Load_ChainPosRuleSet( HB_ChainPosRuleSet* cprs,
4198 HB_Stream stream )
4199 {
4200 HB_Error error;
4201
4202 HB_UShort n, m, count;
4203 HB_UInt cur_offset, new_offset, base_offset;
4204
4205 HB_ChainPosRule* cpr;
4206
4207
4208 base_offset = FILE_Pos();
4209
4210 if ( ACCESS_Frame( 2L ) )
4211 return error;
4212
4213 count = cprs->ChainPosRuleCount = GET_UShort();
4214
4215 FORGET_Frame();
4216
4217 cprs->ChainPosRule = NULL;
4218
4219 if ( ALLOC_ARRAY( cprs->ChainPosRule, count, HB_ChainPosRule ) )
4220 return error;
4221
4222 cpr = cprs->ChainPosRule;
4223
4224 for ( n = 0; n < count; n++ )
4225 {
4226 if ( ACCESS_Frame( 2L ) )
4227 goto Fail;
4228
4229 new_offset = GET_UShort() + base_offset;
4230
4231 FORGET_Frame();
4232
4233 cur_offset = FILE_Pos();
4234 if ( FILE_Seek( new_offset ) ||
4235 ( error = Load_ChainPosRule( &cpr[n], stream ) ) != HB_Err_Ok )
4236 goto Fail;
4237 (void)FILE_Seek( cur_offset );
4238 }
4239
4240 return HB_Err_Ok;
4241
4242 Fail:
4243 for ( m = 0; m < n; m++ )
4244 Free_ChainPosRule( &cpr[m] );
4245
4246 FREE( cpr );
4247 return error;
4248 }
4249
4250
4251 static void Free_ChainPosRuleSet( HB_ChainPosRuleSet* cprs )
4252 {
4253 HB_UShort n, count;
4254
4255 HB_ChainPosRule* cpr;
4256
4257
4258 if ( cprs->ChainPosRule )
4259 {
4260 count = cprs->ChainPosRuleCount;
4261 cpr = cprs->ChainPosRule;
4262
4263 for ( n = 0; n < count; n++ )
4264 Free_ChainPosRule( &cpr[n] );
4265
4266 FREE( cpr );
4267 }
4268 }
4269
4270
4271 /* ChainContextPosFormat1 */
4272
4273 static HB_Error Load_ChainContextPos1( HB_ChainContextPosFormat1* ccpf1,
4274 HB_Stream stream )
4275 {
4276 HB_Error error;
4277
4278 HB_UShort n, m, count;
4279 HB_UInt cur_offset, new_offset, base_offset;
4280
4281 HB_ChainPosRuleSet* cprs;
4282
4283
4284 base_offset = FILE_Pos() - 2L;
4285
4286 if ( ACCESS_Frame( 2L ) )
4287 return error;
4288
4289 new_offset = GET_UShort() + base_offset;
4290
4291 FORGET_Frame();
4292
4293 cur_offset = FILE_Pos();
4294 if ( FILE_Seek( new_offset ) ||
4295 ( error = _HB_OPEN_Load_Coverage( &ccpf1->Coverage, stream ) ) != HB_Err_Ok )
4296 return error;
4297 (void)FILE_Seek( cur_offset );
4298
4299 if ( ACCESS_Frame( 2L ) )
4300 goto Fail2;
4301
4302 count = ccpf1->ChainPosRuleSetCount = GET_UShort();
4303
4304 FORGET_Frame();
4305
4306 ccpf1->ChainPosRuleSet = NULL;
4307
4308 if ( ALLOC_ARRAY( ccpf1->ChainPosRuleSet, count, HB_ChainPosRuleSet ) )
4309 goto Fail2;
4310
4311 cprs = ccpf1->ChainPosRuleSet;
4312
4313 for ( n = 0; n < count; n++ )
4314 {
4315 if ( ACCESS_Frame( 2L ) )
4316 goto Fail1;
4317
4318 new_offset = GET_UShort() + base_offset;
4319
4320 FORGET_Frame();
4321
4322 cur_offset = FILE_Pos();
4323 if ( FILE_Seek( new_offset ) ||
4324 ( error = Load_ChainPosRuleSet( &cprs[n], stream ) ) != HB_Err_Ok )
4325 goto Fail1;
4326 (void)FILE_Seek( cur_offset );
4327 }
4328
4329 return HB_Err_Ok;
4330
4331 Fail1:
4332 for ( m = 0; m < n; m++ )
4333 Free_ChainPosRuleSet( &cprs[m] );
4334
4335 FREE( cprs );
4336
4337 Fail2:
4338 _HB_OPEN_Free_Coverage( &ccpf1->Coverage );
4339 return error;
4340 }
4341
4342
4343 static void Free_ChainContextPos1( HB_ChainContextPosFormat1* ccpf1 )
4344 {
4345 HB_UShort n, count;
4346
4347 HB_ChainPosRuleSet* cprs;
4348
4349
4350 if ( ccpf1->ChainPosRuleSet )
4351 {
4352 count = ccpf1->ChainPosRuleSetCount;
4353 cprs = ccpf1->ChainPosRuleSet;
4354
4355 for ( n = 0; n < count; n++ )
4356 Free_ChainPosRuleSet( &cprs[n] );
4357
4358 FREE( cprs );
4359 }
4360
4361 _HB_OPEN_Free_Coverage( &ccpf1->Coverage );
4362 }
4363
4364
4365 /* ChainPosClassRule */
4366
4367 static HB_Error Load_ChainPosClassRule(
4368 HB_ChainContextPosFormat2* ccpf2,
4369 HB_ChainPosClassRule* cpcr,
4370 HB_Stream stream )
4371 {
4372 HB_Error error;
4373
4374 HB_UShort n, count;
4375
4376 HB_UShort* b;
4377 HB_UShort* i;
4378 HB_UShort* l;
4379 HB_PosLookupRecord* plr;
4380
4381
4382 if ( ACCESS_Frame( 2L ) )
4383 return error;
4384
4385 cpcr->BacktrackGlyphCount = GET_UShort();
4386
4387 FORGET_Frame();
4388
4389 if ( cpcr->BacktrackGlyphCount > ccpf2->MaxBacktrackLength )
4390 ccpf2->MaxBacktrackLength = cpcr->BacktrackGlyphCount;
4391
4392 cpcr->Backtrack = NULL;
4393
4394 count = cpcr->BacktrackGlyphCount;
4395
4396 if ( ALLOC_ARRAY( cpcr->Backtrack, count, HB_UShort ) )
4397 return error;
4398
4399 b = cpcr->Backtrack;
4400
4401 if ( ACCESS_Frame( count * 2L ) )
4402 goto Fail4;
4403
4404 for ( n = 0; n < count; n++ )
4405 b[n] = GET_UShort();
4406
4407 FORGET_Frame();
4408
4409 if ( ACCESS_Frame( 2L ) )
4410 goto Fail4;
4411
4412 cpcr->InputGlyphCount = GET_UShort();
4413
4414 if ( cpcr->InputGlyphCount > ccpf2->MaxInputLength )
4415 ccpf2->MaxInputLength = cpcr->InputGlyphCount;
4416
4417 FORGET_Frame();
4418
4419 cpcr->Input = NULL;
4420
4421 count = cpcr->InputGlyphCount - 1; /* only InputGlyphCount - 1 elements */
4422
4423 if ( ALLOC_ARRAY( cpcr->Input, count, HB_UShort ) )
4424 goto Fail4;
4425
4426 i = cpcr->Input;
4427
4428 if ( ACCESS_Frame( count * 2L ) )
4429 goto Fail3;
4430
4431 for ( n = 0; n < count; n++ )
4432 i[n] = GET_UShort();
4433
4434 FORGET_Frame();
4435
4436 if ( ACCESS_Frame( 2L ) )
4437 goto Fail3;
4438
4439 cpcr->LookaheadGlyphCount = GET_UShort();
4440
4441 FORGET_Frame();
4442
4443 if ( cpcr->LookaheadGlyphCount > ccpf2->MaxLookaheadLength )
4444 ccpf2->MaxLookaheadLength = cpcr->LookaheadGlyphCount;
4445
4446 cpcr->Lookahead = NULL;
4447
4448 count = cpcr->LookaheadGlyphCount;
4449
4450 if ( ALLOC_ARRAY( cpcr->Lookahead, count, HB_UShort ) )
4451 goto Fail3;
4452
4453 l = cpcr->Lookahead;
4454
4455 if ( ACCESS_Frame( count * 2L ) )
4456 goto Fail2;
4457
4458 for ( n = 0; n < count; n++ )
4459 l[n] = GET_UShort();
4460
4461 FORGET_Frame();
4462
4463 if ( ACCESS_Frame( 2L ) )
4464 goto Fail2;
4465
4466 cpcr->PosCount = GET_UShort();
4467
4468 FORGET_Frame();
4469
4470 cpcr->PosLookupRecord = NULL;
4471
4472 count = cpcr->PosCount;
4473
4474 if ( ALLOC_ARRAY( cpcr->PosLookupRecord, count, HB_PosLookupRecord ) )
4475 goto Fail2;
4476
4477 plr = cpcr->PosLookupRecord;
4478
4479 if ( ACCESS_Frame( count * 4L ) )
4480 goto Fail1;
4481
4482 for ( n = 0; n < count; n++ )
4483 {
4484 plr[n].SequenceIndex = GET_UShort();
4485 plr[n].LookupListIndex = GET_UShort();
4486 }
4487
4488 FORGET_Frame();
4489
4490 return HB_Err_Ok;
4491
4492 Fail1:
4493 FREE( plr );
4494
4495 Fail2:
4496 FREE( l );
4497
4498 Fail3:
4499 FREE( i );
4500
4501 Fail4:
4502 FREE( b );
4503 return error;
4504 }
4505
4506
4507 static void Free_ChainPosClassRule( HB_ChainPosClassRule* cpcr )
4508 {
4509 FREE( cpcr->PosLookupRecord );
4510 FREE( cpcr->Lookahead );
4511 FREE( cpcr->Input );
4512 FREE( cpcr->Backtrack );
4513 }
4514
4515
4516 /* PosClassSet */
4517
4518 static HB_Error Load_ChainPosClassSet(
4519 HB_ChainContextPosFormat2* ccpf2,
4520 HB_ChainPosClassSet* cpcs,
4521 HB_Stream stream )
4522 {
4523 HB_Error error;
4524
4525 HB_UShort n, m, count;
4526 HB_UInt cur_offset, new_offset, base_offset;
4527
4528 HB_ChainPosClassRule* cpcr;
4529
4530
4531 base_offset = FILE_Pos();
4532
4533 if ( ACCESS_Frame( 2L ) )
4534 return error;
4535
4536 count = cpcs->ChainPosClassRuleCount = GET_UShort();
4537
4538 FORGET_Frame();
4539
4540 cpcs->ChainPosClassRule = NULL;
4541
4542 if ( ALLOC_ARRAY( cpcs->ChainPosClassRule, count,
4543 HB_ChainPosClassRule ) )
4544 return error;
4545
4546 cpcr = cpcs->ChainPosClassRule;
4547
4548 for ( n = 0; n < count; n++ )
4549 {
4550 if ( ACCESS_Frame( 2L ) )
4551 goto Fail;
4552
4553 new_offset = GET_UShort() + base_offset;
4554
4555 FORGET_Frame();
4556
4557 cur_offset = FILE_Pos();
4558 if ( FILE_Seek( new_offset ) ||
4559 ( error = Load_ChainPosClassRule( ccpf2, &cpcr[n],
4560 stream ) ) != HB_Err_Ok )
4561 goto Fail;
4562 (void)FILE_Seek( cur_offset );
4563 }
4564
4565 return HB_Err_Ok;
4566
4567 Fail:
4568 for ( m = 0; m < n; m++ )
4569 Free_ChainPosClassRule( &cpcr[m] );
4570
4571 FREE( cpcr );
4572 return error;
4573 }
4574
4575
4576 static void Free_ChainPosClassSet( HB_ChainPosClassSet* cpcs )
4577 {
4578 HB_UShort n, count;
4579
4580 HB_ChainPosClassRule* cpcr;
4581
4582
4583 if ( cpcs->ChainPosClassRule )
4584 {
4585 count = cpcs->ChainPosClassRuleCount;
4586 cpcr = cpcs->ChainPosClassRule;
4587
4588 for ( n = 0; n < count; n++ )
4589 Free_ChainPosClassRule( &cpcr[n] );
4590
4591 FREE( cpcr );
4592 }
4593 }
4594
4595
4596 /* ChainContextPosFormat2 */
4597
4598 static HB_Error Load_ChainContextPos2( HB_ChainContextPosFormat2* ccpf2,
4599 HB_Stream stream )
4600 {
4601 HB_Error error;
4602
4603 HB_UShort n, m, count;
4604 HB_UInt cur_offset, new_offset, base_offset;
4605 HB_UInt backtrack_offset, input_offset, lookahead_offset;
4606
4607 HB_ChainPosClassSet* cpcs;
4608
4609
4610 base_offset = FILE_Pos() - 2;
4611
4612 if ( ACCESS_Frame( 2L ) )
4613 return error;
4614
4615 new_offset = GET_UShort() + base_offset;
4616
4617 FORGET_Frame();
4618
4619 cur_offset = FILE_Pos();
4620 if ( FILE_Seek( new_offset ) ||
4621 ( error = _HB_OPEN_Load_Coverage( &ccpf2->Coverage, stream ) ) != HB_Err_Ok )
4622 return error;
4623 (void)FILE_Seek( cur_offset );
4624
4625 if ( ACCESS_Frame( 8L ) )
4626 goto Fail5;
4627
4628 backtrack_offset = GET_UShort();
4629 input_offset = GET_UShort();
4630 lookahead_offset = GET_UShort();
4631
4632 /* `ChainPosClassSetCount' is the upper limit for input class values,
4633 thus we read it now to make an additional safety check. No limit
4634 is known or needed for the other two class definitions */
4635
4636 count = ccpf2->ChainPosClassSetCount = GET_UShort();
4637
4638 FORGET_Frame();
4639
4640 if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccpf2->BacktrackClassDef, 65535,
4641 backtrack_offset, base_offset,
4642 stream ) ) != HB_Err_Ok )
4643 goto Fail5;
4644 if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccpf2->InputClassDef, count,
4645 input_offset, base_offset,
4646 stream ) ) != HB_Err_Ok )
4647 goto Fail4;
4648 if ( ( error = _HB_OPEN_Load_EmptyOrClassDefinition( &ccpf2->LookaheadClassDef, 65535,
4649 lookahead_offset, base_offset,
4650 stream ) ) != HB_Err_Ok )
4651 goto Fail3;
4652
4653 ccpf2->ChainPosClassSet = NULL;
4654 ccpf2->MaxBacktrackLength = 0;
4655 ccpf2->MaxInputLength = 0;
4656 ccpf2->MaxLookaheadLength = 0;
4657
4658 if ( ALLOC_ARRAY( ccpf2->ChainPosClassSet, count, HB_ChainPosClassSet ) )
4659 goto Fail2;
4660
4661 cpcs = ccpf2->ChainPosClassSet;
4662
4663 for ( n = 0; n < count; n++ )
4664 {
4665 if ( ACCESS_Frame( 2L ) )
4666 goto Fail1;
4667
4668 new_offset = GET_UShort() + base_offset;
4669
4670 FORGET_Frame();
4671
4672 if ( new_offset != base_offset ) /* not a NULL offset */
4673 {
4674 cur_offset = FILE_Pos();
4675 if ( FILE_Seek( new_offset ) ||
4676 ( error = Load_ChainPosClassSet( ccpf2, &cpcs[n],
4677 stream ) ) != HB_Err_Ok )
4678 goto Fail1;
4679 (void)FILE_Seek( cur_offset );
4680 }
4681 else
4682 {
4683 /* we create a ChainPosClassSet table with no entries */
4684
4685 ccpf2->ChainPosClassSet[n].ChainPosClassRuleCount = 0;
4686 ccpf2->ChainPosClassSet[n].ChainPosClassRule = NULL;
4687 }
4688 }
4689
4690 return HB_Err_Ok;
4691
4692 Fail1:
4693 for ( m = 0; m < n; m++ )
4694 Free_ChainPosClassSet( &cpcs[m] );
4695
4696 FREE( cpcs );
4697
4698 Fail2:
4699 _HB_OPEN_Free_ClassDefinition( &ccpf2->LookaheadClassDef );
4700
4701 Fail3:
4702 _HB_OPEN_Free_ClassDefinition( &ccpf2->InputClassDef );
4703
4704 Fail4:
4705 _HB_OPEN_Free_ClassDefinition( &ccpf2->BacktrackClassDef );
4706
4707 Fail5:
4708 _HB_OPEN_Free_Coverage( &ccpf2->Coverage );
4709 return error;
4710 }
4711
4712
4713 static void Free_ChainContextPos2( HB_ChainContextPosFormat2* ccpf2 )
4714 {
4715 HB_UShort n, count;
4716
4717 HB_ChainPosClassSet* cpcs;
4718
4719
4720 if ( ccpf2->ChainPosClassSet )
4721 {
4722 count = ccpf2->ChainPosClassSetCount;
4723 cpcs = ccpf2->ChainPosClassSet;
4724
4725 for ( n = 0; n < count; n++ )
4726 Free_ChainPosClassSet( &cpcs[n] );
4727
4728 FREE( cpcs );
4729 }
4730
4731 _HB_OPEN_Free_ClassDefinition( &ccpf2->LookaheadClassDef );
4732 _HB_OPEN_Free_ClassDefinition( &ccpf2->InputClassDef );
4733 _HB_OPEN_Free_ClassDefinition( &ccpf2->BacktrackClassDef );
4734
4735 _HB_OPEN_Free_Coverage( &ccpf2->Coverage );
4736 }
4737
4738
4739 /* ChainContextPosFormat3 */
4740
4741 static HB_Error Load_ChainContextPos3( HB_ChainContextPosFormat3* ccpf3,
4742 HB_Stream stream )
4743 {
4744 HB_Error error;
4745
4746 HB_UShort n, nb, ni, nl, m, count;
4747 HB_UShort backtrack_count, input_count, lookahead_count;
4748 HB_UInt cur_offset, new_offset, base_offset;
4749
4750 HB_Coverage* b;
4751 HB_Coverage* i;
4752 HB_Coverage* l;
4753 HB_PosLookupRecord* plr;
4754
4755
4756 base_offset = FILE_Pos() - 2L;
4757
4758 if ( ACCESS_Frame( 2L ) )
4759 return error;
4760
4761 ccpf3->BacktrackGlyphCount = GET_UShort();
4762
4763 FORGET_Frame();
4764
4765 ccpf3->BacktrackCoverage = NULL;
4766
4767 backtrack_count = ccpf3->BacktrackGlyphCount;
4768
4769 if ( ALLOC_ARRAY( ccpf3->BacktrackCoverage, backtrack_count,
4770 HB_Coverage ) )
4771 return error;
4772
4773 b = ccpf3->BacktrackCoverage;
4774
4775 for ( nb = 0; nb < backtrack_count; nb++ )
4776 {
4777 if ( ACCESS_Frame( 2L ) )
4778 goto Fail4;
4779
4780 new_offset = GET_UShort() + base_offset;
4781
4782 FORGET_Frame();
4783
4784 cur_offset = FILE_Pos();
4785 if ( FILE_Seek( new_offset ) ||
4786 ( error = _HB_OPEN_Load_Coverage( &b[nb], stream ) ) != HB_Err_Ok )
4787 goto Fail4;
4788 (void)FILE_Seek( cur_offset );
4789 }
4790
4791 if ( ACCESS_Frame( 2L ) )
4792 goto Fail4;
4793
4794 ccpf3->InputGlyphCount = GET_UShort();
4795
4796 FORGET_Frame();
4797
4798 ccpf3->InputCoverage = NULL;
4799
4800 input_count = ccpf3->InputGlyphCount;
4801
4802 if ( ALLOC_ARRAY( ccpf3->InputCoverage, input_count, HB_Coverage ) )
4803 goto Fail4;
4804
4805 i = ccpf3->InputCoverage;
4806
4807 for ( ni = 0; ni < input_count; ni++ )
4808 {
4809 if ( ACCESS_Frame( 2L ) )
4810 goto Fail3;
4811
4812 new_offset = GET_UShort() + base_offset;
4813
4814 FORGET_Frame();
4815
4816 cur_offset = FILE_Pos();
4817 if ( FILE_Seek( new_offset ) ||
4818 ( error = _HB_OPEN_Load_Coverage( &i[ni], stream ) ) != HB_Err_Ok )
4819 goto Fail3;
4820 (void)FILE_Seek( cur_offset );
4821 }
4822
4823 if ( ACCESS_Frame( 2L ) )
4824 goto Fail3;
4825
4826 ccpf3->LookaheadGlyphCount = GET_UShort();
4827
4828 FORGET_Frame();
4829
4830 ccpf3->LookaheadCoverage = NULL;
4831
4832 lookahead_count = ccpf3->LookaheadGlyphCount;
4833
4834 if ( ALLOC_ARRAY( ccpf3->LookaheadCoverage, lookahead_count,
4835 HB_Coverage ) )
4836 goto Fail3;
4837
4838 l = ccpf3->LookaheadCoverage;
4839
4840 for ( nl = 0; nl < lookahead_count; nl++ )
4841 {
4842 if ( ACCESS_Frame( 2L ) )
4843 goto Fail2;
4844
4845 new_offset = GET_UShort() + base_offset;
4846
4847 FORGET_Frame();
4848
4849 cur_offset = FILE_Pos();
4850 if ( FILE_Seek( new_offset ) ||
4851 ( error = _HB_OPEN_Load_Coverage( &l[nl], stream ) ) != HB_Err_Ok )
4852 goto Fail2;
4853 (void)FILE_Seek( cur_offset );
4854 }
4855
4856 if ( ACCESS_Frame( 2L ) )
4857 goto Fail2;
4858
4859 ccpf3->PosCount = GET_UShort();
4860
4861 FORGET_Frame();
4862
4863 ccpf3->PosLookupRecord = NULL;
4864
4865 count = ccpf3->PosCount;
4866
4867 if ( ALLOC_ARRAY( ccpf3->PosLookupRecord, count, HB_PosLookupRecord ) )
4868 goto Fail2;
4869
4870 plr = ccpf3->PosLookupRecord;
4871
4872 if ( ACCESS_Frame( count * 4L ) )
4873 goto Fail1;
4874
4875 for ( n = 0; n < count; n++ )
4876 {
4877 plr[n].SequenceIndex = GET_UShort();
4878 plr[n].LookupListIndex = GET_UShort();
4879 }
4880
4881 FORGET_Frame();
4882
4883 return HB_Err_Ok;
4884
4885 Fail1:
4886 FREE( plr );
4887
4888 Fail2:
4889 for ( m = 0; m < nl; m++ )
4890 _HB_OPEN_Free_Coverage( &l[m] );
4891
4892 FREE( l );
4893
4894 Fail3:
4895 for ( m = 0; m < ni; m++ )
4896 _HB_OPEN_Free_Coverage( &i[m] );
4897
4898 FREE( i );
4899
4900 Fail4:
4901 for ( m = 0; m < nb; m++ )
4902 _HB_OPEN_Free_Coverage( &b[m] );
4903
4904 FREE( b );
4905 return error;
4906 }
4907
4908
4909 static void Free_ChainContextPos3( HB_ChainContextPosFormat3* ccpf3 )
4910 {
4911 HB_UShort n, count;
4912
4913 HB_Coverage* c;
4914
4915
4916 FREE( ccpf3->PosLookupRecord );
4917
4918 if ( ccpf3->LookaheadCoverage )
4919 {
4920 count = ccpf3->LookaheadGlyphCount;
4921 c = ccpf3->LookaheadCoverage;
4922
4923 for ( n = 0; n < count; n++ )
4924 _HB_OPEN_Free_Coverage( &c[n] );
4925
4926 FREE( c );
4927 }
4928
4929 if ( ccpf3->InputCoverage )
4930 {
4931 count = ccpf3->InputGlyphCount;
4932 c = ccpf3->InputCoverage;
4933
4934 for ( n = 0; n < count; n++ )
4935 _HB_OPEN_Free_Coverage( &c[n] );
4936
4937 FREE( c );
4938 }
4939
4940 if ( ccpf3->BacktrackCoverage )
4941 {
4942 count = ccpf3->BacktrackGlyphCount;
4943 c = ccpf3->BacktrackCoverage;
4944
4945 for ( n = 0; n < count; n++ )
4946 _HB_OPEN_Free_Coverage( &c[n] );
4947
4948 FREE( c );
4949 }
4950 }
4951
4952
4953 /* ChainContextPos */
4954
4955 static HB_Error Load_ChainContextPos( HB_GPOS_SubTable* st,
4956 HB_Stream stream )
4957 {
4958 HB_Error error;
4959 HB_ChainContextPos* ccp = &st->chain;
4960
4961
4962 if ( ACCESS_Frame( 2L ) )
4963 return error;
4964
4965 ccp->PosFormat = GET_UShort();
4966
4967 FORGET_Frame();
4968
4969 switch ( ccp->PosFormat )
4970 {
4971 case 1:
4972 return Load_ChainContextPos1( &ccp->ccpf.ccpf1, stream );
4973
4974 case 2:
4975 return Load_ChainContextPos2( &ccp->ccpf.ccpf2, stream );
4976
4977 case 3:
4978 return Load_ChainContextPos3( &ccp->ccpf.ccpf3, stream );
4979
4980 default:
4981 return ERR(HB_Err_Invalid_SubTable_Format);
4982 }
4983
4984 return HB_Err_Ok; /* never reached */
4985 }
4986
4987
4988 static void Free_ChainContextPos( HB_GPOS_SubTable* st )
4989 {
4990 HB_ChainContextPos* ccp = &st->chain;
4991
4992 switch ( ccp->PosFormat )
4993 {
4994 case 1: Free_ChainContextPos1( &ccp->ccpf.ccpf1 ); break;
4995 case 2: Free_ChainContextPos2( &ccp->ccpf.ccpf2 ); break;
4996 case 3: Free_ChainContextPos3( &ccp->ccpf.ccpf3 ); break;
4997 default: break;
4998 }
4999 }
5000
5001
5002 static HB_Error Lookup_ChainContextPos1(
5003 GPOS_Instance* gpi,
5004 HB_ChainContextPosFormat1* ccpf1,
5005 HB_Buffer buffer,
5006 HB_UShort flags,
5007 HB_UShort context_length,
5008 int nesting_level )
5009 {
5010 HB_UShort index, property;
5011 HB_UShort i, j, k, num_cpr;
5012 HB_UShort bgc, igc, lgc;
5013 HB_Error error;
5014 HB_GPOSHeader* gpos = gpi->gpos;
5015
5016 HB_ChainPosRule* cpr;
5017 HB_ChainPosRule curr_cpr;
5018 HB_GDEFHeader* gdef;
5019
5020
5021 gdef = gpos->gdef;
5022
5023 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
5024 return error;
5025
5026 error = _HB_OPEN_Coverage_Index( &ccpf1->Coverage, IN_CURGLYPH(), &index );
5027 if ( error )
5028 return error;
5029
5030 cpr = ccpf1->ChainPosRuleSet[index].ChainPosRule;
5031 num_cpr = ccpf1->ChainPosRuleSet[index].ChainPosRuleCount;
5032
5033 for ( k = 0; k < num_cpr; k++ )
5034 {
5035 curr_cpr = cpr[k];
5036 bgc = curr_cpr.BacktrackGlyphCount;
5037 igc = curr_cpr.InputGlyphCount;
5038 lgc = curr_cpr.LookaheadGlyphCount;
5039
5040 if ( context_length != 0xFFFF && context_length < igc )
5041 goto next_chainposrule;
5042
5043 /* check whether context is too long; it is a first guess only */
5044
5045 if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length )
5046 goto next_chainposrule;
5047
5048 if ( bgc )
5049 {
5050 /* Since we don't know in advance the number of glyphs to inspect,
5051 we search backwards for matches in the backtrack glyph array */
5052
5053 for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- )
5054 {
5055 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5056 {
5057 if ( error && error != HB_Err_Not_Covered )
5058 return error;
5059
5060 if ( j + 1 == bgc - i )
5061 goto next_chainposrule;
5062 j--;
5063 }
5064
5065 /* In OpenType 1.3, it is undefined whether the offsets of
5066 backtrack glyphs is in logical order or not. Version 1.4
5067 will clarify this:
5068
5069 Logical order - a b c d e f g h i j
5070 i
5071 Input offsets - 0 1
5072 Backtrack offsets - 3 2 1 0
5073 Lookahead offsets - 0 1 2 3 */
5074
5075 if ( IN_GLYPH( j ) != curr_cpr.Backtrack[i] )
5076 goto next_chainposrule;
5077 }
5078 }
5079
5080 /* Start at 1 because [0] is implied */
5081
5082 for ( i = 1, j = buffer->in_pos + 1; i < igc; i++, j++ )
5083 {
5084 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5085 {
5086 if ( error && error != HB_Err_Not_Covered )
5087 return error;
5088
5089 if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
5090 goto next_chainposrule;
5091 j++;
5092 }
5093
5094 if ( IN_GLYPH( j ) != curr_cpr.Input[i - 1] )
5095 goto next_chainposrule;
5096 }
5097
5098 /* we are starting to check for lookahead glyphs right after the
5099 last context glyph */
5100
5101 for ( i = 0; i < lgc; i++, j++ )
5102 {
5103 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5104 {
5105 if ( error && error != HB_Err_Not_Covered )
5106 return error;
5107
5108 if ( j + lgc - i == (HB_Int)buffer->in_length )
5109 goto next_chainposrule;
5110 j++;
5111 }
5112
5113 if ( IN_GLYPH( j ) != curr_cpr.Lookahead[i] )
5114 goto next_chainposrule;
5115 }
5116
5117 return Do_ContextPos( gpi, igc,
5118 curr_cpr.PosCount,
5119 curr_cpr.PosLookupRecord,
5120 buffer,
5121 nesting_level );
5122
5123 next_chainposrule:
5124 ;
5125 }
5126
5127 return HB_Err_Not_Covered;
5128 }
5129
5130
5131 static HB_Error Lookup_ChainContextPos2(
5132 GPOS_Instance* gpi,
5133 HB_ChainContextPosFormat2* ccpf2,
5134 HB_Buffer buffer,
5135 HB_UShort flags,
5136 HB_UShort context_length,
5137 int nesting_level )
5138 {
5139 HB_UShort index, property;
5140 HB_Error error;
5141 HB_UShort i, j, k;
5142 HB_UShort bgc, igc, lgc;
5143 HB_UShort known_backtrack_classes,
5144 known_input_classes,
5145 known_lookahead_classes;
5146
5147 HB_UShort* backtrack_classes;
5148 HB_UShort* input_classes;
5149 HB_UShort* lookahead_classes;
5150
5151 HB_UShort* bc;
5152 HB_UShort* ic;
5153 HB_UShort* lc;
5154 HB_GPOSHeader* gpos = gpi->gpos;
5155
5156 HB_ChainPosClassSet* cpcs;
5157 HB_ChainPosClassRule cpcr;
5158 HB_GDEFHeader* gdef;
5159
5160
5161 gdef = gpos->gdef;
5162
5163 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
5164 return error;
5165
5166 /* Note: The coverage table in format 2 doesn't give an index into
5167 anything. It just lets us know whether or not we need to
5168 do any lookup at all. */
5169
5170 error = _HB_OPEN_Coverage_Index( &ccpf2->Coverage, IN_CURGLYPH(), &index );
5171 if ( error )
5172 return error;
5173
5174 if (ccpf2->MaxInputLength < 1)
5175 return HB_Err_Not_Covered;
5176
5177 if ( ALLOC_ARRAY( backtrack_classes, ccpf2->MaxBacktrackLength, HB_UShort ) )
5178 return error;
5179 known_backtrack_classes = 0;
5180
5181 if ( ALLOC_ARRAY( input_classes, ccpf2->MaxInputLength, HB_UShort ) )
5182 goto End3;
5183 known_input_classes = 1;
5184
5185 if ( ALLOC_ARRAY( lookahead_classes, ccpf2->MaxLookaheadLength, HB_UShort ) )
5186 goto End2;
5187 known_lookahead_classes = 0;
5188
5189 error = _HB_OPEN_Get_Class( &ccpf2->InputClassDef, IN_CURGLYPH(),
5190 &input_classes[0], NULL );
5191 if ( error && error != HB_Err_Not_Covered )
5192 goto End1;
5193
5194 cpcs = &ccpf2->ChainPosClassSet[input_classes[0]];
5195 if ( !cpcs )
5196 {
5197 error = ERR(HB_Err_Invalid_SubTable);
5198 goto End1;
5199 }
5200
5201 for ( k = 0; k < cpcs->ChainPosClassRuleCount; k++ )
5202 {
5203 cpcr = cpcs->ChainPosClassRule[k];
5204 bgc = cpcr.BacktrackGlyphCount;
5205 igc = cpcr.InputGlyphCount;
5206 lgc = cpcr.LookaheadGlyphCount;
5207
5208 if ( context_length != 0xFFFF && context_length < igc )
5209 goto next_chainposclassrule;
5210
5211 /* check whether context is too long; it is a first guess only */
5212
5213 if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length )
5214 goto next_chainposclassrule;
5215
5216 if ( bgc )
5217 {
5218 /* Since we don't know in advance the number of glyphs to inspect,
5219 we search backwards for matches in the backtrack glyph array.
5220 Note that `known_backtrack_classes' starts at index 0. */
5221
5222 bc = cpcr.Backtrack;
5223
5224 for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- )
5225 {
5226 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5227 {
5228 if ( error && error != HB_Err_Not_Covered )
5229 goto End1;
5230
5231 if ( j + 1 == bgc - i )
5232 goto next_chainposclassrule;
5233 j++;
5234 }
5235
5236 if ( i >= known_backtrack_classes )
5237 {
5238 /* Keeps us from having to do this for each rule */
5239
5240 error = _HB_OPEN_Get_Class( &ccpf2->BacktrackClassDef, IN_GLYPH( j ),
5241 &backtrack_classes[i], NULL );
5242 if ( error && error != HB_Err_Not_Covered )
5243 goto End1;
5244 known_backtrack_classes = i;
5245 }
5246
5247 if ( bc[i] != backtrack_classes[i] )
5248 goto next_chainposclassrule;
5249 }
5250 }
5251
5252 ic = cpcr.Input;
5253
5254 /* Start at 1 because [0] is implied */
5255
5256 for ( i = 1, j = buffer->in_pos + 1; i < igc; i++, j++ )
5257 {
5258 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5259 {
5260 if ( error && error != HB_Err_Not_Covered )
5261 goto End1;
5262
5263 if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
5264 goto next_chainposclassrule;
5265 j++;
5266 }
5267
5268 if ( i >= known_input_classes )
5269 {
5270 error = _HB_OPEN_Get_Class( &ccpf2->InputClassDef, IN_GLYPH( j ),
5271 &input_classes[i], NULL );
5272 if ( error && error != HB_Err_Not_Covered )
5273 goto End1;
5274 known_input_classes = i;
5275 }
5276
5277 if ( ic[i - 1] != input_classes[i] )
5278 goto next_chainposclassrule;
5279 }
5280
5281 /* we are starting to check for lookahead glyphs right after the
5282 last context glyph */
5283
5284 lc = cpcr.Lookahead;
5285
5286 for ( i = 0; i < lgc; i++, j++ )
5287 {
5288 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5289 {
5290 if ( error && error != HB_Err_Not_Covered )
5291 goto End1;
5292
5293 if ( j + lgc - i == (HB_Int)buffer->in_length )
5294 goto next_chainposclassrule;
5295 j++;
5296 }
5297
5298 if ( i >= known_lookahead_classes )
5299 {
5300 error = _HB_OPEN_Get_Class( &ccpf2->LookaheadClassDef, IN_GLYPH( j ),
5301 &lookahead_classes[i], NULL );
5302 if ( error && error != HB_Err_Not_Covered )
5303 goto End1;
5304 known_lookahead_classes = i;
5305 }
5306
5307 if ( lc[i] != lookahead_classes[i] )
5308 goto next_chainposclassrule;
5309 }
5310
5311 error = Do_ContextPos( gpi, igc,
5312 cpcr.PosCount,
5313 cpcr.PosLookupRecord,
5314 buffer,
5315 nesting_level );
5316 goto End1;
5317
5318 next_chainposclassrule:
5319 ;
5320 }
5321
5322 error = HB_Err_Not_Covered;
5323
5324 End1:
5325 FREE( lookahead_classes );
5326
5327 End2:
5328 FREE( input_classes );
5329
5330 End3:
5331 FREE( backtrack_classes );
5332 return error;
5333 }
5334
5335
5336 static HB_Error Lookup_ChainContextPos3(
5337 GPOS_Instance* gpi,
5338 HB_ChainContextPosFormat3* ccpf3,
5339 HB_Buffer buffer,
5340 HB_UShort flags,
5341 HB_UShort context_length,
5342 int nesting_level )
5343 {
5344 HB_UShort index, i, j, property;
5345 HB_UShort bgc, igc, lgc;
5346 HB_Error error;
5347 HB_GPOSHeader* gpos = gpi->gpos;
5348
5349 HB_Coverage* bc;
5350 HB_Coverage* ic;
5351 HB_Coverage* lc;
5352 HB_GDEFHeader* gdef;
5353
5354
5355 gdef = gpos->gdef;
5356
5357 if ( CHECK_Property( gdef, IN_CURITEM(), flags, &property ) )
5358 return error;
5359
5360 bgc = ccpf3->BacktrackGlyphCount;
5361 igc = ccpf3->InputGlyphCount;
5362 lgc = ccpf3->LookaheadGlyphCount;
5363
5364 if ( context_length != 0xFFFF && context_length < igc )
5365 return HB_Err_Not_Covered;
5366
5367 /* check whether context is too long; it is a first guess only */
5368
5369 if ( bgc > buffer->in_pos || buffer->in_pos + igc + lgc > buffer->in_length )
5370 return HB_Err_Not_Covered;
5371
5372 if ( bgc )
5373 {
5374 /* Since we don't know in advance the number of glyphs to inspect,
5375 we search backwards for matches in the backtrack glyph array */
5376
5377 bc = ccpf3->BacktrackCoverage;
5378
5379 for ( i = 0, j = buffer->in_pos - 1; i < bgc; i++, j-- )
5380 {
5381 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5382 {
5383 if ( error && error != HB_Err_Not_Covered )
5384 return error;
5385
5386 if ( j + 1 == bgc - i )
5387 return HB_Err_Not_Covered;
5388 j--;
5389 }
5390
5391 error = _HB_OPEN_Coverage_Index( &bc[i], IN_GLYPH( j ), &index );
5392 if ( error )
5393 return error;
5394 }
5395 }
5396
5397 ic = ccpf3->InputCoverage;
5398
5399 for ( i = 0, j = buffer->in_pos; i < igc; i++, j++ )
5400 {
5401 /* We already called CHECK_Property for IN_GLYPH ( buffer->in_pos ) */
5402 while ( j > buffer->in_pos && CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5403 {
5404 if ( error && error != HB_Err_Not_Covered )
5405 return error;
5406
5407 if ( j + igc - i + lgc == (HB_Int)buffer->in_length )
5408 return HB_Err_Not_Covered;
5409 j++;
5410 }
5411
5412 error = _HB_OPEN_Coverage_Index( &ic[i], IN_GLYPH( j ), &index );
5413 if ( error )
5414 return error;
5415 }
5416
5417 /* we are starting to check for lookahead glyphs right after the
5418 last context glyph */
5419
5420 lc = ccpf3->LookaheadCoverage;
5421
5422 for ( i = 0; i < lgc; i++, j++ )
5423 {
5424 while ( CHECK_Property( gdef, IN_ITEM( j ), flags, &property ) )
5425 {
5426 if ( error && error != HB_Err_Not_Covered )
5427 return error;
5428
5429 if ( j + lgc - i == (HB_Int)buffer->in_length )
5430 return HB_Err_Not_Covered;
5431 j++;
5432 }
5433
5434 error = _HB_OPEN_Coverage_Index( &lc[i], IN_GLYPH( j ), &index );
5435 if ( error )
5436 return error;
5437 }
5438
5439 return Do_ContextPos( gpi, igc,
5440 ccpf3->PosCount,
5441 ccpf3->PosLookupRecord,
5442 buffer,
5443 nesting_level );
5444 }
5445
5446
5447 static HB_Error Lookup_ChainContextPos(
5448 GPOS_Instance* gpi,
5449 HB_GPOS_SubTable* st,
5450 HB_Buffer buffer,
5451 HB_UShort flags,
5452 HB_UShort context_length,
5453 int nesting_level )
5454 {
5455 HB_ChainContextPos* ccp = &st->chain;
5456
5457 switch ( ccp->PosFormat )
5458 {
5459 case 1:
5460 return Lookup_ChainContextPos1( gpi, &ccp->ccpf.ccpf1, buffer,
5461 flags, context_length,
5462 nesting_level );
5463
5464 case 2:
5465 return Lookup_ChainContextPos2( gpi, &ccp->ccpf.ccpf2, buffer,
5466 flags, context_length,
5467 nesting_level );
5468
5469 case 3:
5470 return Lookup_ChainContextPos3( gpi, &ccp->ccpf.ccpf3, buffer,
5471 flags, context_length,
5472 nesting_level );
5473
5474 default:
5475 return ERR(HB_Err_Invalid_SubTable_Format);
5476 }
5477
5478 return HB_Err_Ok; /* never reached */
5479 }
5480
5481
5482
5483 /***********
5484 * GPOS API
5485 ***********/
5486
5487
5488
5489 HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
5490 HB_UInt script_tag,
5491 HB_UShort* script_index )
5492 {
5493 HB_UShort n;
5494
5495 HB_ScriptList* sl;
5496 HB_ScriptRecord* sr;
5497
5498
5499 if ( !gpos || !script_index )
5500 return ERR(HB_Err_Invalid_Argument);
5501
5502 sl = &gpos->ScriptList;
5503 sr = sl->ScriptRecord;
5504
5505 for ( n = 0; n < sl->ScriptCount; n++ )
5506 if ( script_tag == sr[n].ScriptTag )
5507 {
5508 *script_index = n;
5509
5510 return HB_Err_Ok;
5511 }
5512
5513 return HB_Err_Not_Covered;
5514 }
5515
5516
5517
5518 HB_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos,
5519 HB_UInt language_tag,
5520 HB_UShort script_index,
5521 HB_UShort* language_index,
5522 HB_UShort* req_feature_index )
5523 {
5524 HB_UShort n;
5525
5526 HB_ScriptList* sl;
5527 HB_ScriptRecord* sr;
5528 HB_ScriptTable* s;
5529 HB_LangSysRecord* lsr;
5530
5531
5532 if ( !gpos || !language_index || !req_feature_index )
5533 return ERR(HB_Err_Invalid_Argument);
5534
5535 sl = &gpos->ScriptList;
5536 sr = sl->ScriptRecord;
5537
5538 if ( script_index >= sl->ScriptCount )
5539 return ERR(HB_Err_Invalid_Argument);
5540
5541 s = &sr[script_index].Script;
5542 lsr = s->LangSysRecord;
5543
5544 for ( n = 0; n < s->LangSysCount; n++ )
5545 if ( language_tag == lsr[n].LangSysTag )
5546 {
5547 *language_index = n;
5548 *req_feature_index = lsr[n].LangSys.ReqFeatureIndex;
5549
5550 return HB_Err_Ok;
5551 }
5552
5553 return HB_Err_Not_Covered;
5554 }
5555
5556
5557 /* selecting 0xFFFF for language_index asks for the values of the
5558 default language (DefaultLangSys) */
5559
5560
5561 HB_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos,
5562 HB_UInt feature_tag,
5563 HB_UShort script_index,
5564 HB_UShort language_index,
5565 HB_UShort* feature_index )
5566 {
5567 HB_UShort n;
5568
5569 HB_ScriptList* sl;
5570 HB_ScriptRecord* sr;
5571 HB_ScriptTable* s;
5572 HB_LangSysRecord* lsr;
5573 HB_LangSys* ls;
5574 HB_UShort* fi;
5575
5576 HB_FeatureList* fl;
5577 HB_FeatureRecord* fr;
5578
5579
5580 if ( !gpos || !feature_index )
5581 return ERR(HB_Err_Invalid_Argument);
5582
5583 sl = &gpos->ScriptList;
5584 sr = sl->ScriptRecord;
5585
5586 fl = &gpos->FeatureList;
5587 fr = fl->FeatureRecord;
5588
5589 if ( script_index >= sl->ScriptCount )
5590 return ERR(HB_Err_Invalid_Argument);
5591
5592 s = &sr[script_index].Script;
5593 lsr = s->LangSysRecord;
5594
5595 if ( language_index == 0xFFFF )
5596 ls = &s->DefaultLangSys;
5597 else
5598 {
5599 if ( language_index >= s->LangSysCount )
5600 return ERR(HB_Err_Invalid_Argument);
5601
5602 ls = &lsr[language_index].LangSys;
5603 }
5604
5605 fi = ls->FeatureIndex;
5606
5607 for ( n = 0; n < ls->FeatureCount; n++ )
5608 {
5609 if ( fi[n] >= fl->FeatureCount )
5610 return ERR(HB_Err_Invalid_SubTable_Format);
5611
5612 if ( feature_tag == fr[fi[n]].FeatureTag )
5613 {
5614 *feature_index = fi[n];
5615
5616 return HB_Err_Ok;
5617 }
5618 }
5619
5620 return HB_Err_Not_Covered;
5621 }
5622
5623
5624 /* The next three functions return a null-terminated list */
5625
5626
5627 HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
5628 HB_UInt** script_tag_list )
5629 {
5630 HB_Error error;
5631 HB_UShort n;
5632 HB_UInt* stl;
5633
5634 HB_ScriptList* sl;
5635 HB_ScriptRecord* sr;
5636
5637
5638 if ( !gpos || !script_tag_list )
5639 return ERR(HB_Err_Invalid_Argument);
5640
5641 sl = &gpos->ScriptList;
5642 sr = sl->ScriptRecord;
5643
5644 if ( ALLOC_ARRAY( stl, sl->ScriptCount + 1, HB_UInt ) )
5645 return error;
5646
5647 for ( n = 0; n < sl->ScriptCount; n++ )
5648 stl[n] = sr[n].ScriptTag;
5649 stl[n] = 0;
5650
5651 *script_tag_list = stl;
5652
5653 return HB_Err_Ok;
5654 }
5655
5656
5657
5658 HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
5659 HB_UShort script_index,
5660 HB_UInt** language_tag_list )
5661 {
5662 HB_Error error;
5663 HB_UShort n;
5664 HB_UInt* ltl;
5665
5666 HB_ScriptList* sl;
5667 HB_ScriptRecord* sr;
5668 HB_ScriptTable* s;
5669 HB_LangSysRecord* lsr;
5670
5671
5672 if ( !gpos || !language_tag_list )
5673 return ERR(HB_Err_Invalid_Argument);
5674
5675 sl = &gpos->ScriptList;
5676 sr = sl->ScriptRecord;
5677
5678 if ( script_index >= sl->ScriptCount )
5679 return ERR(HB_Err_Invalid_Argument);
5680
5681 s = &sr[script_index].Script;
5682 lsr = s->LangSysRecord;
5683
5684 if ( ALLOC_ARRAY( ltl, s->LangSysCount + 1, HB_UInt ) )
5685 return error;
5686
5687 for ( n = 0; n < s->LangSysCount; n++ )
5688 ltl[n] = lsr[n].LangSysTag;
5689 ltl[n] = 0;
5690
5691 *language_tag_list = ltl;
5692
5693 return HB_Err_Ok;
5694 }
5695
5696
5697 /* selecting 0xFFFF for language_index asks for the values of the
5698 default language (DefaultLangSys) */
5699
5700
5701 HB_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos,
5702 HB_UShort script_index,
5703 HB_UShort language_index,
5704 HB_UInt** feature_tag_list )
5705 {
5706 HB_UShort n;
5707 HB_Error error;
5708 HB_UInt* ftl;
5709
5710 HB_ScriptList* sl;
5711 HB_ScriptRecord* sr;
5712 HB_ScriptTable* s;
5713 HB_LangSysRecord* lsr;
5714 HB_LangSys* ls;
5715 HB_UShort* fi;
5716
5717 HB_FeatureList* fl;
5718 HB_FeatureRecord* fr;
5719
5720
5721 if ( !gpos || !feature_tag_list )
5722 return ERR(HB_Err_Invalid_Argument);
5723
5724 sl = &gpos->ScriptList;
5725 sr = sl->ScriptRecord;
5726
5727 fl = &gpos->FeatureList;
5728 fr = fl->FeatureRecord;
5729
5730 if ( script_index >= sl->ScriptCount )
5731 return ERR(HB_Err_Invalid_Argument);
5732
5733 s = &sr[script_index].Script;
5734 lsr = s->LangSysRecord;
5735
5736 if ( language_index == 0xFFFF )
5737 ls = &s->DefaultLangSys;
5738 else
5739 {
5740 if ( language_index >= s->LangSysCount )
5741 return ERR(HB_Err_Invalid_Argument);
5742
5743 ls = &lsr[language_index].LangSys;
5744 }
5745
5746 fi = ls->FeatureIndex;
5747
5748 if ( ALLOC_ARRAY( ftl, ls->FeatureCount + 1, HB_UInt ) )
5749 return error;
5750
5751 for ( n = 0; n < ls->FeatureCount; n++ )
5752 {
5753 if ( fi[n] >= fl->FeatureCount )
5754 {
5755 FREE( ftl );
5756 return ERR(HB_Err_Invalid_SubTable_Format);
5757 }
5758 ftl[n] = fr[fi[n]].FeatureTag;
5759 }
5760 ftl[n] = 0;
5761
5762 *feature_tag_list = ftl;
5763
5764 return HB_Err_Ok;
5765 }
5766
5767
5768 /* Do an individual subtable lookup. Returns HB_Err_Ok if positioning
5769 has been done, or HB_Err_Not_Covered if not. */
5770 static HB_Error GPOS_Do_Glyph_Lookup( GPOS_Instance* gpi,
5771 HB_UShort lookup_index,
5772 HB_Buffer buffer,
5773 HB_UShort context_length,
5774 int nesting_level )
5775 {
5776 HB_Error error = HB_Err_Not_Covered;
5777 HB_UShort i, flags, lookup_count;
5778 HB_GPOSHeader* gpos = gpi->gpos;
5779 HB_Lookup* lo;
5780 int lookup_type;
5781
5782
5783 nesting_level++;
5784
5785 if ( nesting_level > HB_MAX_NESTING_LEVEL )
5786 return ERR(HB_Err_Not_Covered); /* ERR() call intended */
5787
5788 lookup_count = gpos->LookupList.LookupCount;
5789 if (lookup_index >= lookup_count)
5790 return error;
5791
5792 lo = &gpos->LookupList.Lookup[lookup_index];
5793 flags = lo->LookupFlag;
5794 lookup_type = lo->LookupType;
5795
5796 for ( i = 0; i < lo->SubTableCount; i++ )
5797 {
5798 HB_GPOS_SubTable *st = &lo->SubTable[i].st.gpos;
5799
5800 switch (lookup_type) {
5801 case HB_GPOS_LOOKUP_SINGLE:
5802 error = Lookup_SinglePos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5803 case HB_GPOS_LOOKUP_PAIR:
5804 error = Lookup_PairPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5805 case HB_GPOS_LOOKUP_CURSIVE:
5806 error = Lookup_CursivePos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5807 case HB_GPOS_LOOKUP_MARKBASE:
5808 error = Lookup_MarkBasePos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5809 case HB_GPOS_LOOKUP_MARKLIG:
5810 error = Lookup_MarkLigPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5811 case HB_GPOS_LOOKUP_MARKMARK:
5812 error = Lookup_MarkMarkPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5813 case HB_GPOS_LOOKUP_CONTEXT:
5814 error = Lookup_ContextPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5815 case HB_GPOS_LOOKUP_CHAIN:
5816 error = Lookup_ChainContextPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;
5817 /*case HB_GPOS_LOOKUP_EXTENSION:
5818 error = Lookup_ExtensionPos ( gpi, st, buffer, flags, context_length, nesting_level ); break;*/
5819 default:
5820 error = HB_Err_Not_Covered;
5821 }
5822
5823 /* Check whether we have a successful positioning or an error other
5824 than HB_Err_Not_Covered */
5825 if ( error != HB_Err_Not_Covered )
5826 return error;
5827 }
5828
5829 return HB_Err_Not_Covered;
5830 }
5831
5832
5833 HB_INTERNAL HB_Error
5834 _HB_GPOS_Load_SubTable( HB_GPOS_SubTable* st,
5835 HB_Stream stream,
5836 HB_UShort lookup_type )
5837 {
5838 switch ( lookup_type ) {
5839 case HB_GPOS_LOOKUP_SINGLE: return Load_SinglePos ( st, stream );
5840 case HB_GPOS_LOOKUP_PAIR: return Load_PairPos ( st, stream );
5841 case HB_GPOS_LOOKUP_CURSIVE: return Load_CursivePos ( st, stream );
5842 case HB_GPOS_LOOKUP_MARKBASE: return Load_MarkBasePos ( st, stream );
5843 case HB_GPOS_LOOKUP_MARKLIG: return Load_MarkLigPos ( st, stream );
5844 case HB_GPOS_LOOKUP_MARKMARK: return Load_MarkMarkPos ( st, stream );
5845 case HB_GPOS_LOOKUP_CONTEXT: return Load_ContextPos ( st, stream );
5846 case HB_GPOS_LOOKUP_CHAIN: return Load_ChainContextPos ( st, stream );
5847 /*case HB_GPOS_LOOKUP_EXTENSION: return Load_ExtensionPos ( st, stream );*/
5848 default: return ERR(HB_Err_Invalid_SubTable_Format);
5849 }
5850 }
5851
5852
5853 HB_INTERNAL void
5854 _HB_GPOS_Free_SubTable( HB_GPOS_SubTable* st,
5855 HB_UShort lookup_type )
5856 {
5857 switch ( lookup_type ) {
5858 case HB_GPOS_LOOKUP_SINGLE: Free_SinglePos ( st ); return;
5859 case HB_GPOS_LOOKUP_PAIR: Free_PairPos ( st ); return;
5860 case HB_GPOS_LOOKUP_CURSIVE: Free_CursivePos ( st ); return;
5861 case HB_GPOS_LOOKUP_MARKBASE: Free_MarkBasePos ( st ); return;
5862 case HB_GPOS_LOOKUP_MARKLIG: Free_MarkLigPos ( st ); return;
5863 case HB_GPOS_LOOKUP_MARKMARK: Free_MarkMarkPos ( st ); return;
5864 case HB_GPOS_LOOKUP_CONTEXT: Free_ContextPos ( st ); return;
5865 case HB_GPOS_LOOKUP_CHAIN: Free_ChainContextPos ( st ); return;
5866 /*case HB_GPOS_LOOKUP_EXTENSION: Free_ExtensionPos ( st ); return;*/
5867 default: return;
5868 }
5869 }
5870
5871
5872 /* apply one lookup to the input string object */
5873
5874 static HB_Error GPOS_Do_String_Lookup( GPOS_Instance* gpi,
5875 HB_UShort lookup_index,
5876 HB_Buffer buffer )
5877 {
5878 HB_Error error, retError = HB_Err_Not_Covered;
5879 HB_GPOSHeader* gpos = gpi->gpos;
5880
5881 HB_UInt* properties = gpos->LookupList.Properties;
5882
5883 const int nesting_level = 0;
5884 /* 0xFFFF indicates that we don't have a context length yet */
5885 const HB_UShort context_length = 0xFFFF;
5886
5887
5888 gpi->last = 0xFFFF; /* no last valid glyph for cursive pos. */
5889
5890 buffer->in_pos = 0;
5891 while ( buffer->in_pos < buffer->in_length )
5892 {
5893 if ( ~IN_PROPERTIES( buffer->in_pos ) & properties[lookup_index] )
5894 {
5895 /* Note that the connection between mark and base glyphs hold
5896 exactly one (string) lookup. For example, it would be possible
5897 that in the first lookup, mark glyph X is attached to base
5898 glyph A, and in the next lookup it is attached to base glyph B.
5899 It is up to the font designer to provide meaningful lookups and
5900 lookup order. */
5901
5902 error = GPOS_Do_Glyph_Lookup( gpi, lookup_index, buffer, context_length, nesting_level );
5903 if ( error && error != HB_Err_Not_Covered )
5904 return error;
5905 }
5906 else
5907 {
5908 /* Contrary to properties defined in GDEF, user-defined properties
5909 will always stop a possible cursive positioning. */
5910 gpi->last = 0xFFFF;
5911
5912 error = HB_Err_Not_Covered;
5913 }
5914
5915 if ( error == HB_Err_Not_Covered )
5916 (buffer->in_pos)++;
5917 else
5918 retError = error;
5919 }
5920
5921 return retError;
5922 }
5923
5924
5925 static HB_Error Position_CursiveChain ( HB_Buffer buffer )
5926 {
5927 HB_UInt i, j;
5928 HB_Position positions = buffer->positions;
5929
5930 /* First handle all left-to-right connections */
5931 for (j = 0; j < buffer->in_length; j++)
5932 {
5933 if (positions[j].cursive_chain > 0)
5934 positions[j].y_pos += positions[j - positions[j].cursive_chain].y_pos;
5935 }
5936
5937 /* Then handle all right-to-left connections */
5938 for (i = buffer->in_length; i > 0; i--)
5939 {
5940 j = i - 1;
5941
5942 if (positions[j].cursive_chain < 0)
5943 positions[j].y_pos += positions[j - positions[j].cursive_chain].y_pos;
5944 }
5945
5946 return HB_Err_Ok;
5947 }
5948
5949
5950 HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
5951 HB_UShort feature_index,
5952 HB_UInt property )
5953 {
5954 HB_UShort i;
5955
5956 HB_Feature feature;
5957 HB_UInt* properties;
5958 HB_UShort* index;
5959 HB_UShort lookup_count;
5960
5961 /* Each feature can only be added once */
5962
5963 if ( !gpos ||
5964 feature_index >= gpos->FeatureList.FeatureCount ||
5965 gpos->FeatureList.ApplyCount == gpos->FeatureList.FeatureCount )
5966 return ERR(HB_Err_Invalid_Argument);
5967
5968 gpos->FeatureList.ApplyOrder[gpos->FeatureList.ApplyCount++] = feature_index;
5969
5970 properties = gpos->LookupList.Properties;
5971
5972 feature = gpos->FeatureList.FeatureRecord[feature_index].Feature;
5973 index = feature.LookupListIndex;
5974 lookup_count = gpos->LookupList.LookupCount;
5975
5976 for ( i = 0; i < feature.LookupListCount; i++ )
5977 {
5978 HB_UShort lookup_index = index[i];
5979 if (lookup_index < lookup_count)
5980 properties[lookup_index] |= property;
5981 }
5982
5983 return HB_Err_Ok;
5984 }
5985
5986
5987
5988 HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos )
5989 {
5990 HB_UShort i;
5991
5992 HB_UInt* properties;
5993
5994
5995 if ( !gpos )
5996 return ERR(HB_Err_Invalid_Argument);
5997
5998 gpos->FeatureList.ApplyCount = 0;
5999
6000 properties = gpos->LookupList.Properties;
6001
6002 for ( i = 0; i < gpos->LookupList.LookupCount; i++ )
6003 properties[i] = 0;
6004
6005 return HB_Err_Ok;
6006 }
6007
6008 #ifdef HB_SUPPORT_MULTIPLE_MASTER
6009 HB_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos,
6010 HB_MMFunction mmfunc,
6011 void* data )
6012 {
6013 if ( !gpos )
6014 return ERR(HB_Err_Invalid_Argument);
6015
6016 gpos->mmfunc = mmfunc;
6017 gpos->data = data;
6018
6019 return HB_Err_Ok;
6020 }
6021 #endif
6022
6023 /* If `dvi' is TRUE, glyph contour points for anchor points and device
6024 tables are ignored -- you will get device independent values. */
6025
6026
6027 HB_Error HB_GPOS_Apply_String( HB_Font font,
6028 HB_GPOSHeader* gpos,
6029 HB_UShort load_flags,
6030 HB_Buffer buffer,
6031 HB_Bool dvi,
6032 HB_Bool r2l )
6033 {
6034 HB_Error error, retError = HB_Err_Not_Covered;
6035 GPOS_Instance gpi;
6036 int i, j, lookup_count, num_features;
6037
6038 if ( !font || !gpos || !buffer )
6039 return ERR(HB_Err_Invalid_Argument);
6040
6041 if ( buffer->in_length == 0 )
6042 return HB_Err_Not_Covered;
6043
6044 gpi.font = font;
6045 gpi.gpos = gpos;
6046 gpi.load_flags = load_flags;
6047 gpi.r2l = r2l;
6048 gpi.dvi = dvi;
6049
6050 lookup_count = gpos->LookupList.LookupCount;
6051 num_features = gpos->FeatureList.ApplyCount;
6052
6053 if ( num_features )
6054 {
6055 error = _hb_buffer_clear_positions( buffer );
6056 if ( error )
6057 return error;
6058 }
6059
6060 for ( i = 0; i < num_features; i++ )
6061 {
6062 HB_UShort feature_index = gpos->FeatureList.ApplyOrder[i];
6063 HB_Feature feature = gpos->FeatureList.FeatureRecord[feature_index].Feature;
6064
6065 for ( j = 0; j < feature.LookupListCount; j++ )
6066 {
6067 HB_UShort lookup_index = feature.LookupListIndex[j];
6068
6069 /* Skip nonexistant lookups */
6070 if (lookup_index >= lookup_count)
6071 continue;
6072
6073 error = GPOS_Do_String_Lookup( &gpi, lookup_index, buffer );
6074 if ( error )
6075 {
6076 if ( error != HB_Err_Not_Covered )
6077 return error;
6078 }
6079 else
6080 retError = error;
6081 }
6082 }
6083
6084 if ( num_features )
6085 {
6086 error = Position_CursiveChain ( buffer );
6087 if ( error )
6088 return error;
6089 }
6090
6091 return retError;
6092 }
6093
6094 /* END */