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[reactos.git] / reactos / lib / 3rdparty / freetype / src / truetype / ttgload.c
1 /***************************************************************************/
2 /* */
3 /* ttgload.c */
4 /* */
5 /* TrueType Glyph Loader (body). */
6 /* */
7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */
8 /* 2010 by */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
10 /* */
11 /* This file is part of the FreeType project, and may only be used, */
12 /* modified, and distributed under the terms of the FreeType project */
13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
14 /* this file you indicate that you have read the license and */
15 /* understand and accept it fully. */
16 /* */
17 /***************************************************************************/
18
19
20 #include <ft2build.h>
21 #include FT_INTERNAL_DEBUG_H
22 #include FT_INTERNAL_CALC_H
23 #include FT_INTERNAL_STREAM_H
24 #include FT_INTERNAL_SFNT_H
25 #include FT_TRUETYPE_TAGS_H
26 #include FT_OUTLINE_H
27
28 #include "ttgload.h"
29 #include "ttpload.h"
30
31 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
32 #include "ttgxvar.h"
33 #endif
34
35 #include "tterrors.h"
36
37
38 /*************************************************************************/
39 /* */
40 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
41 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
42 /* messages during execution. */
43 /* */
44 #undef FT_COMPONENT
45 #define FT_COMPONENT trace_ttgload
46
47
48 /*************************************************************************/
49 /* */
50 /* Composite font flags. */
51 /* */
52 #define ARGS_ARE_WORDS 0x0001
53 #define ARGS_ARE_XY_VALUES 0x0002
54 #define ROUND_XY_TO_GRID 0x0004
55 #define WE_HAVE_A_SCALE 0x0008
56 /* reserved 0x0010 */
57 #define MORE_COMPONENTS 0x0020
58 #define WE_HAVE_AN_XY_SCALE 0x0040
59 #define WE_HAVE_A_2X2 0x0080
60 #define WE_HAVE_INSTR 0x0100
61 #define USE_MY_METRICS 0x0200
62 #define OVERLAP_COMPOUND 0x0400
63 #define SCALED_COMPONENT_OFFSET 0x0800
64 #define UNSCALED_COMPONENT_OFFSET 0x1000
65
66
67 /*************************************************************************/
68 /* */
69 /* Returns the horizontal metrics in font units for a given glyph. If */
70 /* `check' is true, take care of monospaced fonts by returning the */
71 /* advance width maximum. */
72 /* */
73 FT_LOCAL_DEF( void )
74 TT_Get_HMetrics( TT_Face face,
75 FT_UInt idx,
76 FT_Bool check,
77 FT_Short* lsb,
78 FT_UShort* aw )
79 {
80 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
81
82 if ( check && face->postscript.isFixedPitch )
83 *aw = face->horizontal.advance_Width_Max;
84
85 FT_TRACE5(( " advance width (font units): %d\n", *aw ));
86 FT_TRACE5(( " left side bearing (font units): %d\n", *lsb ));
87 }
88
89
90 /*************************************************************************/
91 /* */
92 /* Returns the vertical metrics in font units for a given glyph. */
93 /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */
94 /* table, typoAscender/Descender from the `OS/2' table would be used */
95 /* instead, and if there were no `OS/2' table, use ascender/descender */
96 /* from the `hhea' table. But that is not what Microsoft's rasterizer */
97 /* apparently does: It uses the ppem value as the advance height, and */
98 /* sets the top side bearing to be zero. */
99 /* */
100 /* The monospace `check' is probably not meaningful here, but we leave */
101 /* it in for a consistent interface. */
102 /* */
103 FT_LOCAL_DEF( void )
104 TT_Get_VMetrics( TT_Face face,
105 FT_UInt idx,
106 FT_Bool check,
107 FT_Short* tsb,
108 FT_UShort* ah )
109 {
110 FT_UNUSED( check );
111
112 if ( face->vertical_info )
113 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
114
115 #if 1 /* Empirically determined, at variance with what MS said */
116
117 else
118 {
119 *tsb = 0;
120 *ah = face->root.units_per_EM;
121 }
122
123 #else /* This is what MS said to do. It isn't what they do, however. */
124
125 else if ( face->os2.version != 0xFFFFU )
126 {
127 *tsb = face->os2.sTypoAscender;
128 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender;
129 }
130 else
131 {
132 *tsb = face->horizontal.Ascender;
133 *ah = face->horizontal.Ascender - face->horizontal.Descender;
134 }
135
136 #endif
137
138 FT_TRACE5(( " advance height (font units): %d\n", *ah ));
139 FT_TRACE5(( " top side bearing (font units): %d\n", *tsb ));
140 }
141
142
143 static void
144 tt_get_metrics( TT_Loader loader,
145 FT_UInt glyph_index )
146 {
147 TT_Face face = (TT_Face)loader->face;
148
149 FT_Short left_bearing = 0, top_bearing = 0;
150 FT_UShort advance_width = 0, advance_height = 0;
151
152
153 TT_Get_HMetrics( face, glyph_index,
154 (FT_Bool)!( loader->load_flags &
155 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
156 &left_bearing,
157 &advance_width );
158 TT_Get_VMetrics( face, glyph_index,
159 (FT_Bool)!( loader->load_flags &
160 FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
161 &top_bearing,
162 &advance_height );
163
164 loader->left_bearing = left_bearing;
165 loader->advance = advance_width;
166 loader->top_bearing = top_bearing;
167 loader->vadvance = advance_height;
168
169 if ( !loader->linear_def )
170 {
171 loader->linear_def = 1;
172 loader->linear = advance_width;
173 }
174 }
175
176
177 #ifdef FT_CONFIG_OPTION_INCREMENTAL
178
179 static void
180 tt_get_metrics_incr_overrides( TT_Loader loader,
181 FT_UInt glyph_index )
182 {
183 TT_Face face = (TT_Face)loader->face;
184
185 FT_Short left_bearing = 0, top_bearing = 0;
186 FT_UShort advance_width = 0, advance_height = 0;
187
188
189 /* If this is an incrementally loaded font check whether there are */
190 /* overriding metrics for this glyph. */
191 if ( face->root.internal->incremental_interface &&
192 face->root.internal->incremental_interface->funcs->get_glyph_metrics )
193 {
194 FT_Incremental_MetricsRec metrics;
195 FT_Error error;
196
197
198 metrics.bearing_x = loader->left_bearing;
199 metrics.bearing_y = 0;
200 metrics.advance = loader->advance;
201 metrics.advance_v = 0;
202
203 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
204 face->root.internal->incremental_interface->object,
205 glyph_index, FALSE, &metrics );
206 if ( error )
207 goto Exit;
208
209 left_bearing = (FT_Short)metrics.bearing_x;
210 advance_width = (FT_UShort)metrics.advance;
211
212 #if 0
213
214 /* GWW: Do I do the same for vertical metrics? */
215 metrics.bearing_x = 0;
216 metrics.bearing_y = loader->top_bearing;
217 metrics.advance = loader->vadvance;
218
219 error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
220 face->root.internal->incremental_interface->object,
221 glyph_index, TRUE, &metrics );
222 if ( error )
223 goto Exit;
224
225 top_bearing = (FT_Short)metrics.bearing_y;
226 advance_height = (FT_UShort)metrics.advance;
227
228 #endif /* 0 */
229
230 loader->left_bearing = left_bearing;
231 loader->advance = advance_width;
232 loader->top_bearing = top_bearing;
233 loader->vadvance = advance_height;
234
235 if ( !loader->linear_def )
236 {
237 loader->linear_def = 1;
238 loader->linear = advance_width;
239 }
240 }
241
242 Exit:
243 return;
244 }
245
246 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
247
248
249 /*************************************************************************/
250 /* */
251 /* Translates an array of coordinates. */
252 /* */
253 static void
254 translate_array( FT_UInt n,
255 FT_Vector* coords,
256 FT_Pos delta_x,
257 FT_Pos delta_y )
258 {
259 FT_UInt k;
260
261
262 if ( delta_x )
263 for ( k = 0; k < n; k++ )
264 coords[k].x += delta_x;
265
266 if ( delta_y )
267 for ( k = 0; k < n; k++ )
268 coords[k].y += delta_y;
269 }
270
271
272 #undef IS_HINTED
273 #define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
274
275
276 /*************************************************************************/
277 /* */
278 /* The following functions are used by default with TrueType fonts. */
279 /* However, they can be replaced by alternatives if we need to support */
280 /* TrueType-compressed formats (like MicroType) in the future. */
281 /* */
282 /*************************************************************************/
283
284 FT_CALLBACK_DEF( FT_Error )
285 TT_Access_Glyph_Frame( TT_Loader loader,
286 FT_UInt glyph_index,
287 FT_ULong offset,
288 FT_UInt byte_count )
289 {
290 FT_Error error;
291 FT_Stream stream = loader->stream;
292
293 /* for non-debug mode */
294 FT_UNUSED( glyph_index );
295
296
297 FT_TRACE4(( "Glyph %ld\n", glyph_index ));
298
299 /* the following line sets the `error' variable through macros! */
300 if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
301 return error;
302
303 loader->cursor = stream->cursor;
304 loader->limit = stream->limit;
305
306 return TT_Err_Ok;
307 }
308
309
310 FT_CALLBACK_DEF( void )
311 TT_Forget_Glyph_Frame( TT_Loader loader )
312 {
313 FT_Stream stream = loader->stream;
314
315
316 FT_FRAME_EXIT();
317 }
318
319
320 FT_CALLBACK_DEF( FT_Error )
321 TT_Load_Glyph_Header( TT_Loader loader )
322 {
323 FT_Byte* p = loader->cursor;
324 FT_Byte* limit = loader->limit;
325
326
327 if ( p + 10 > limit )
328 return TT_Err_Invalid_Outline;
329
330 loader->n_contours = FT_NEXT_SHORT( p );
331
332 loader->bbox.xMin = FT_NEXT_SHORT( p );
333 loader->bbox.yMin = FT_NEXT_SHORT( p );
334 loader->bbox.xMax = FT_NEXT_SHORT( p );
335 loader->bbox.yMax = FT_NEXT_SHORT( p );
336
337 FT_TRACE5(( " # of contours: %d\n", loader->n_contours ));
338 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin,
339 loader->bbox.xMax ));
340 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin,
341 loader->bbox.yMax ));
342 loader->cursor = p;
343
344 return TT_Err_Ok;
345 }
346
347
348 FT_CALLBACK_DEF( FT_Error )
349 TT_Load_Simple_Glyph( TT_Loader load )
350 {
351 FT_Error error;
352 FT_Byte* p = load->cursor;
353 FT_Byte* limit = load->limit;
354 FT_GlyphLoader gloader = load->gloader;
355 FT_Int n_contours = load->n_contours;
356 FT_Outline* outline;
357 TT_Face face = (TT_Face)load->face;
358 FT_UShort n_ins;
359 FT_Int n_points;
360
361 FT_Byte *flag, *flag_limit;
362 FT_Byte c, count;
363 FT_Vector *vec, *vec_limit;
364 FT_Pos x;
365 FT_Short *cont, *cont_limit, prev_cont;
366 FT_Int xy_size = 0;
367
368
369 /* check that we can add the contours to the glyph */
370 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
371 if ( error )
372 goto Fail;
373
374 /* reading the contours' endpoints & number of points */
375 cont = gloader->current.outline.contours;
376 cont_limit = cont + n_contours;
377
378 /* check space for contours array + instructions count */
379 if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
380 goto Invalid_Outline;
381
382 prev_cont = FT_NEXT_USHORT( p );
383
384 if ( n_contours > 0 )
385 cont[0] = prev_cont;
386
387 for ( cont++; cont < cont_limit; cont++ )
388 {
389 cont[0] = FT_NEXT_USHORT( p );
390 if ( cont[0] <= prev_cont )
391 {
392 /* unordered contours: this is invalid */
393 error = TT_Err_Invalid_Table;
394 goto Fail;
395 }
396 prev_cont = cont[0];
397 }
398
399 n_points = 0;
400 if ( n_contours > 0 )
401 {
402 n_points = cont[-1] + 1;
403 if ( n_points < 0 )
404 goto Invalid_Outline;
405 }
406
407 /* note that we will add four phantom points later */
408 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
409 if ( error )
410 goto Fail;
411
412 /* we'd better check the contours table right now */
413 outline = &gloader->current.outline;
414
415 for ( cont = outline->contours + 1; cont < cont_limit; cont++ )
416 if ( cont[-1] >= cont[0] )
417 goto Invalid_Outline;
418
419 /* reading the bytecode instructions */
420 load->glyph->control_len = 0;
421 load->glyph->control_data = 0;
422
423 if ( p + 2 > limit )
424 goto Invalid_Outline;
425
426 n_ins = FT_NEXT_USHORT( p );
427
428 FT_TRACE5(( " Instructions size: %u\n", n_ins ));
429
430 if ( n_ins > face->max_profile.maxSizeOfInstructions )
431 {
432 FT_TRACE0(( "TT_Load_Simple_Glyph: too many instructions (%d)\n",
433 n_ins ));
434 error = TT_Err_Too_Many_Hints;
435 goto Fail;
436 }
437
438 if ( ( limit - p ) < n_ins )
439 {
440 FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));
441 error = TT_Err_Too_Many_Hints;
442 goto Fail;
443 }
444
445 #ifdef TT_USE_BYTECODE_INTERPRETER
446
447 if ( IS_HINTED( load->load_flags ) )
448 {
449 load->glyph->control_len = n_ins;
450 load->glyph->control_data = load->exec->glyphIns;
451
452 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
453 }
454
455 #endif /* TT_USE_BYTECODE_INTERPRETER */
456
457 p += n_ins;
458
459 /* reading the point tags */
460 flag = (FT_Byte*)outline->tags;
461 flag_limit = flag + n_points;
462
463 FT_ASSERT( flag != NULL );
464
465 while ( flag < flag_limit )
466 {
467 if ( p + 1 > limit )
468 goto Invalid_Outline;
469
470 *flag++ = c = FT_NEXT_BYTE( p );
471 if ( c & 8 )
472 {
473 if ( p + 1 > limit )
474 goto Invalid_Outline;
475
476 count = FT_NEXT_BYTE( p );
477 if ( flag + (FT_Int)count > flag_limit )
478 goto Invalid_Outline;
479
480 for ( ; count > 0; count-- )
481 *flag++ = c;
482 }
483 }
484
485 /* reading the X coordinates */
486
487 vec = outline->points;
488 vec_limit = vec + n_points;
489 flag = (FT_Byte*)outline->tags;
490 x = 0;
491
492 if ( p + xy_size > limit )
493 goto Invalid_Outline;
494
495 for ( ; vec < vec_limit; vec++, flag++ )
496 {
497 FT_Pos y = 0;
498 FT_Byte f = *flag;
499
500
501 if ( f & 2 )
502 {
503 if ( p + 1 > limit )
504 goto Invalid_Outline;
505
506 y = (FT_Pos)FT_NEXT_BYTE( p );
507 if ( ( f & 16 ) == 0 )
508 y = -y;
509 }
510 else if ( ( f & 16 ) == 0 )
511 {
512 if ( p + 2 > limit )
513 goto Invalid_Outline;
514
515 y = (FT_Pos)FT_NEXT_SHORT( p );
516 }
517
518 x += y;
519 vec->x = x;
520 /* the cast is for stupid compilers */
521 *flag = (FT_Byte)( f & ~( 2 | 16 ) );
522 }
523
524 /* reading the Y coordinates */
525
526 vec = gloader->current.outline.points;
527 vec_limit = vec + n_points;
528 flag = (FT_Byte*)outline->tags;
529 x = 0;
530
531 for ( ; vec < vec_limit; vec++, flag++ )
532 {
533 FT_Pos y = 0;
534 FT_Byte f = *flag;
535
536
537 if ( f & 4 )
538 {
539 if ( p + 1 > limit )
540 goto Invalid_Outline;
541
542 y = (FT_Pos)FT_NEXT_BYTE( p );
543 if ( ( f & 32 ) == 0 )
544 y = -y;
545 }
546 else if ( ( f & 32 ) == 0 )
547 {
548 if ( p + 2 > limit )
549 goto Invalid_Outline;
550
551 y = (FT_Pos)FT_NEXT_SHORT( p );
552 }
553
554 x += y;
555 vec->y = x;
556 /* the cast is for stupid compilers */
557 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON );
558 }
559
560 outline->n_points = (FT_UShort)n_points;
561 outline->n_contours = (FT_Short) n_contours;
562
563 load->cursor = p;
564
565 Fail:
566 return error;
567
568 Invalid_Outline:
569 error = TT_Err_Invalid_Outline;
570 goto Fail;
571 }
572
573
574 FT_CALLBACK_DEF( FT_Error )
575 TT_Load_Composite_Glyph( TT_Loader loader )
576 {
577 FT_Error error;
578 FT_Byte* p = loader->cursor;
579 FT_Byte* limit = loader->limit;
580 FT_GlyphLoader gloader = loader->gloader;
581 FT_SubGlyph subglyph;
582 FT_UInt num_subglyphs;
583
584
585 num_subglyphs = 0;
586
587 do
588 {
589 FT_Fixed xx, xy, yy, yx;
590 FT_UInt count;
591
592
593 /* check that we can load a new subglyph */
594 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
595 if ( error )
596 goto Fail;
597
598 /* check space */
599 if ( p + 4 > limit )
600 goto Invalid_Composite;
601
602 subglyph = gloader->current.subglyphs + num_subglyphs;
603
604 subglyph->arg1 = subglyph->arg2 = 0;
605
606 subglyph->flags = FT_NEXT_USHORT( p );
607 subglyph->index = FT_NEXT_USHORT( p );
608
609 /* check space */
610 count = 2;
611 if ( subglyph->flags & ARGS_ARE_WORDS )
612 count += 2;
613 if ( subglyph->flags & WE_HAVE_A_SCALE )
614 count += 2;
615 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
616 count += 4;
617 else if ( subglyph->flags & WE_HAVE_A_2X2 )
618 count += 8;
619
620 if ( p + count > limit )
621 goto Invalid_Composite;
622
623 /* read arguments */
624 if ( subglyph->flags & ARGS_ARE_WORDS )
625 {
626 subglyph->arg1 = FT_NEXT_SHORT( p );
627 subglyph->arg2 = FT_NEXT_SHORT( p );
628 }
629 else
630 {
631 subglyph->arg1 = FT_NEXT_CHAR( p );
632 subglyph->arg2 = FT_NEXT_CHAR( p );
633 }
634
635 /* read transform */
636 xx = yy = 0x10000L;
637 xy = yx = 0;
638
639 if ( subglyph->flags & WE_HAVE_A_SCALE )
640 {
641 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
642 yy = xx;
643 }
644 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
645 {
646 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
647 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
648 }
649 else if ( subglyph->flags & WE_HAVE_A_2X2 )
650 {
651 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
652 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
653 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
654 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
655 }
656
657 subglyph->transform.xx = xx;
658 subglyph->transform.xy = xy;
659 subglyph->transform.yx = yx;
660 subglyph->transform.yy = yy;
661
662 num_subglyphs++;
663
664 } while ( subglyph->flags & MORE_COMPONENTS );
665
666 gloader->current.num_subglyphs = num_subglyphs;
667
668 #ifdef TT_USE_BYTECODE_INTERPRETER
669
670 {
671 FT_Stream stream = loader->stream;
672
673
674 /* we must undo the FT_FRAME_ENTER in order to point */
675 /* to the composite instructions, if we find some. */
676 /* We will process them later. */
677 /* */
678 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
679 p - limit );
680 }
681
682 #endif
683
684 loader->cursor = p;
685
686 Fail:
687 return error;
688
689 Invalid_Composite:
690 error = TT_Err_Invalid_Composite;
691 goto Fail;
692 }
693
694
695 FT_LOCAL_DEF( void )
696 TT_Init_Glyph_Loading( TT_Face face )
697 {
698 face->access_glyph_frame = TT_Access_Glyph_Frame;
699 face->read_glyph_header = TT_Load_Glyph_Header;
700 face->read_simple_glyph = TT_Load_Simple_Glyph;
701 face->read_composite_glyph = TT_Load_Composite_Glyph;
702 face->forget_glyph_frame = TT_Forget_Glyph_Frame;
703 }
704
705
706 static void
707 tt_prepare_zone( TT_GlyphZone zone,
708 FT_GlyphLoad load,
709 FT_UInt start_point,
710 FT_UInt start_contour )
711 {
712 zone->n_points = (FT_UShort)( load->outline.n_points - start_point );
713 zone->n_contours = (FT_Short) ( load->outline.n_contours -
714 start_contour );
715 zone->org = load->extra_points + start_point;
716 zone->cur = load->outline.points + start_point;
717 zone->orus = load->extra_points2 + start_point;
718 zone->tags = (FT_Byte*)load->outline.tags + start_point;
719 zone->contours = (FT_UShort*)load->outline.contours + start_contour;
720 zone->first_point = (FT_UShort)start_point;
721 }
722
723
724 /*************************************************************************/
725 /* */
726 /* <Function> */
727 /* TT_Hint_Glyph */
728 /* */
729 /* <Description> */
730 /* Hint the glyph using the zone prepared by the caller. Note that */
731 /* the zone is supposed to include four phantom points. */
732 /* */
733 static FT_Error
734 TT_Hint_Glyph( TT_Loader loader,
735 FT_Bool is_composite )
736 {
737 TT_GlyphZone zone = &loader->zone;
738 FT_Pos origin;
739
740 #ifdef TT_USE_BYTECODE_INTERPRETER
741 FT_UInt n_ins;
742 #else
743 FT_UNUSED( is_composite );
744 #endif
745
746
747 #ifdef TT_USE_BYTECODE_INTERPRETER
748 if ( loader->glyph->control_len > 0xFFFFL )
749 {
750 FT_TRACE1(( "TT_Hint_Glyph: too long instructions " ));
751 FT_TRACE1(( "(0x%lx byte) is truncated\n",
752 loader->glyph->control_len ));
753 }
754 n_ins = (FT_UInt)( loader->glyph->control_len );
755 #endif
756
757 origin = zone->cur[zone->n_points - 4].x;
758 origin = FT_PIX_ROUND( origin ) - origin;
759 if ( origin )
760 translate_array( zone->n_points, zone->cur, origin, 0 );
761
762 #ifdef TT_USE_BYTECODE_INTERPRETER
763 /* save original point position in org */
764 if ( n_ins > 0 )
765 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
766
767 /* Reset graphics state. */
768 loader->exec->GS = ((TT_Size)loader->size)->GS;
769
770 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
771 /* completely refer to the (already) hinted subglyphs. */
772 if ( is_composite )
773 {
774 loader->exec->metrics.x_scale = 1 << 16;
775 loader->exec->metrics.y_scale = 1 << 16;
776
777 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
778 }
779 else
780 {
781 loader->exec->metrics.x_scale =
782 ((TT_Size)loader->size)->metrics.x_scale;
783 loader->exec->metrics.y_scale =
784 ((TT_Size)loader->size)->metrics.y_scale;
785 }
786 #endif
787
788 /* round pp2 and pp4 */
789 zone->cur[zone->n_points - 3].x =
790 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
791 zone->cur[zone->n_points - 1].y =
792 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );
793
794 #ifdef TT_USE_BYTECODE_INTERPRETER
795
796 if ( n_ins > 0 )
797 {
798 FT_Bool debug;
799 FT_Error error;
800
801 FT_GlyphLoader gloader = loader->gloader;
802 FT_Outline current_outline = gloader->current.outline;
803
804
805 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
806 loader->exec->glyphIns, n_ins );
807 if ( error )
808 return error;
809
810 loader->exec->is_composite = is_composite;
811 loader->exec->pts = *zone;
812
813 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&
814 ((TT_Size)loader->size)->debug );
815
816 error = TT_Run_Context( loader->exec, debug );
817 if ( error && loader->exec->pedantic_hinting )
818 return error;
819
820 /* store drop-out mode in bits 5-7; set bit 2 also as a marker */
821 current_outline.tags[0] |=
822 ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE;
823 }
824
825 #endif
826
827 /* save glyph phantom points */
828 if ( !loader->preserve_pps )
829 {
830 loader->pp1 = zone->cur[zone->n_points - 4];
831 loader->pp2 = zone->cur[zone->n_points - 3];
832 loader->pp3 = zone->cur[zone->n_points - 2];
833 loader->pp4 = zone->cur[zone->n_points - 1];
834 }
835
836 return TT_Err_Ok;
837 }
838
839
840 /*************************************************************************/
841 /* */
842 /* <Function> */
843 /* TT_Process_Simple_Glyph */
844 /* */
845 /* <Description> */
846 /* Once a simple glyph has been loaded, it needs to be processed. */
847 /* Usually, this means scaling and hinting through bytecode */
848 /* interpretation. */
849 /* */
850 static FT_Error
851 TT_Process_Simple_Glyph( TT_Loader loader )
852 {
853 FT_GlyphLoader gloader = loader->gloader;
854 FT_Error error = TT_Err_Ok;
855 FT_Outline* outline;
856 FT_Int n_points;
857
858
859 outline = &gloader->current.outline;
860 n_points = outline->n_points;
861
862 /* set phantom points */
863
864 outline->points[n_points ] = loader->pp1;
865 outline->points[n_points + 1] = loader->pp2;
866 outline->points[n_points + 2] = loader->pp3;
867 outline->points[n_points + 3] = loader->pp4;
868
869 outline->tags[n_points ] = 0;
870 outline->tags[n_points + 1] = 0;
871 outline->tags[n_points + 2] = 0;
872 outline->tags[n_points + 3] = 0;
873
874 n_points += 4;
875
876 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
877
878 if ( ((TT_Face)loader->face)->doblend )
879 {
880 /* Deltas apply to the unscaled data. */
881 FT_Vector* deltas;
882 FT_Memory memory = loader->face->memory;
883 FT_Int i;
884
885
886 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
887 loader->glyph_index,
888 &deltas,
889 n_points );
890 if ( error )
891 return error;
892
893 for ( i = 0; i < n_points; ++i )
894 {
895 outline->points[i].x += deltas[i].x;
896 outline->points[i].y += deltas[i].y;
897 }
898
899 FT_FREE( deltas );
900 }
901
902 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
903
904 if ( IS_HINTED( loader->load_flags ) )
905 {
906 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
907
908 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
909 loader->zone.n_points + 4 );
910 }
911
912 /* scale the glyph */
913 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
914 {
915 FT_Vector* vec = outline->points;
916 FT_Vector* limit = outline->points + n_points;
917 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
918 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
919
920
921 for ( ; vec < limit; vec++ )
922 {
923 vec->x = FT_MulFix( vec->x, x_scale );
924 vec->y = FT_MulFix( vec->y, y_scale );
925 }
926
927 loader->pp1 = outline->points[n_points - 4];
928 loader->pp2 = outline->points[n_points - 3];
929 loader->pp3 = outline->points[n_points - 2];
930 loader->pp4 = outline->points[n_points - 1];
931 }
932
933 if ( IS_HINTED( loader->load_flags ) )
934 {
935 loader->zone.n_points += 4;
936
937 error = TT_Hint_Glyph( loader, 0 );
938 }
939
940 return error;
941 }
942
943
944 /*************************************************************************/
945 /* */
946 /* <Function> */
947 /* TT_Process_Composite_Component */
948 /* */
949 /* <Description> */
950 /* Once a composite component has been loaded, it needs to be */
951 /* processed. Usually, this means transforming and translating. */
952 /* */
953 static FT_Error
954 TT_Process_Composite_Component( TT_Loader loader,
955 FT_SubGlyph subglyph,
956 FT_UInt start_point,
957 FT_UInt num_base_points )
958 {
959 FT_GlyphLoader gloader = loader->gloader;
960 FT_Vector* base_vec = gloader->base.outline.points;
961 FT_UInt num_points = gloader->base.outline.n_points;
962 FT_Bool have_scale;
963 FT_Pos x, y;
964
965
966 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE |
967 WE_HAVE_AN_XY_SCALE |
968 WE_HAVE_A_2X2 ) );
969
970 /* perform the transform required for this subglyph */
971 if ( have_scale )
972 {
973 FT_UInt i;
974
975
976 for ( i = num_base_points; i < num_points; i++ )
977 FT_Vector_Transform( base_vec + i, &subglyph->transform );
978 }
979
980 /* get offset */
981 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
982 {
983 FT_UInt k = subglyph->arg1;
984 FT_UInt l = subglyph->arg2;
985 FT_Vector* p1;
986 FT_Vector* p2;
987
988
989 /* match l-th point of the newly loaded component to the k-th point */
990 /* of the previously loaded components. */
991
992 /* change to the point numbers used by our outline */
993 k += start_point;
994 l += num_base_points;
995 if ( k >= num_base_points ||
996 l >= num_points )
997 return TT_Err_Invalid_Composite;
998
999 p1 = gloader->base.outline.points + k;
1000 p2 = gloader->base.outline.points + l;
1001
1002 x = p1->x - p2->x;
1003 y = p1->y - p2->y;
1004 }
1005 else
1006 {
1007 x = subglyph->arg1;
1008 y = subglyph->arg2;
1009
1010 if ( !x && !y )
1011 return TT_Err_Ok;
1012
1013 /* Use a default value dependent on */
1014 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */
1015 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */
1016
1017 if ( have_scale &&
1018 #ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
1019 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
1020 #else
1021 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
1022 #endif
1023 {
1024
1025 #if 0
1026
1027 /*************************************************************************/
1028 /* */
1029 /* This algorithm is what Apple documents. But it doesn't work. */
1030 /* */
1031 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx
1032 : -subglyph->transform.xx;
1033 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx
1034 : -subglyph->transform.yx;
1035 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy
1036 : -subglyph->transform.xy;
1037 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy
1038 : -subglyph->transform.yy;
1039 int m = a > b ? a : b;
1040 int n = c > d ? c : d;
1041
1042
1043 if ( a - b <= 33 && a - b >= -33 )
1044 m *= 2;
1045 if ( c - d <= 33 && c - d >= -33 )
1046 n *= 2;
1047 x = FT_MulFix( x, m );
1048 y = FT_MulFix( y, n );
1049
1050 #else /* 0 */
1051
1052 /*************************************************************************/
1053 /* */
1054 /* This algorithm is a guess and works much better than the above. */
1055 /* */
1056 FT_Fixed mac_xscale = FT_SqrtFixed(
1057 (FT_Int32)FT_MulFix( subglyph->transform.xx,
1058 subglyph->transform.xx ) +
1059 (FT_Int32)FT_MulFix( subglyph->transform.xy,
1060 subglyph->transform.xy ) );
1061 FT_Fixed mac_yscale = FT_SqrtFixed(
1062 (FT_Int32)FT_MulFix( subglyph->transform.yy,
1063 subglyph->transform.yy ) +
1064 (FT_Int32)FT_MulFix( subglyph->transform.yx,
1065 subglyph->transform.yx ) );
1066
1067
1068 x = FT_MulFix( x, mac_xscale );
1069 y = FT_MulFix( y, mac_yscale );
1070
1071 #endif /* 0 */
1072
1073 }
1074
1075 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1076 {
1077 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1078 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1079
1080
1081 x = FT_MulFix( x, x_scale );
1082 y = FT_MulFix( y, y_scale );
1083
1084 if ( subglyph->flags & ROUND_XY_TO_GRID )
1085 {
1086 x = FT_PIX_ROUND( x );
1087 y = FT_PIX_ROUND( y );
1088 }
1089 }
1090 }
1091
1092 if ( x || y )
1093 translate_array( num_points - num_base_points,
1094 base_vec + num_base_points,
1095 x, y );
1096
1097 return TT_Err_Ok;
1098 }
1099
1100
1101 /*************************************************************************/
1102 /* */
1103 /* <Function> */
1104 /* TT_Process_Composite_Glyph */
1105 /* */
1106 /* <Description> */
1107 /* This is slightly different from TT_Process_Simple_Glyph, in that */
1108 /* its sole purpose is to hint the glyph. Thus this function is */
1109 /* only available when bytecode interpreter is enabled. */
1110 /* */
1111 static FT_Error
1112 TT_Process_Composite_Glyph( TT_Loader loader,
1113 FT_UInt start_point,
1114 FT_UInt start_contour )
1115 {
1116 FT_Error error;
1117 FT_Outline* outline;
1118 FT_UInt i;
1119
1120
1121 outline = &loader->gloader->base.outline;
1122
1123 /* make room for phantom points */
1124 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
1125 outline->n_points + 4,
1126 0 );
1127 if ( error )
1128 return error;
1129
1130 outline->points[outline->n_points ] = loader->pp1;
1131 outline->points[outline->n_points + 1] = loader->pp2;
1132 outline->points[outline->n_points + 2] = loader->pp3;
1133 outline->points[outline->n_points + 3] = loader->pp4;
1134
1135 outline->tags[outline->n_points ] = 0;
1136 outline->tags[outline->n_points + 1] = 0;
1137 outline->tags[outline->n_points + 2] = 0;
1138 outline->tags[outline->n_points + 3] = 0;
1139
1140 #ifdef TT_USE_BYTECODE_INTERPRETER
1141
1142 {
1143 FT_Stream stream = loader->stream;
1144 FT_UShort n_ins, max_ins;
1145 FT_ULong tmp;
1146
1147
1148 /* TT_Load_Composite_Glyph only gives us the offset of instructions */
1149 /* so we read them here */
1150 if ( FT_STREAM_SEEK( loader->ins_pos ) ||
1151 FT_READ_USHORT( n_ins ) )
1152 return error;
1153
1154 FT_TRACE5(( " Instructions size = %d\n", n_ins ));
1155
1156 /* check it */
1157 max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions;
1158 if ( n_ins > max_ins )
1159 {
1160 /* acroread ignores this field, so we only do a rough safety check */
1161 if ( (FT_Int)n_ins > loader->byte_len )
1162 {
1163 FT_TRACE1(( "TT_Process_Composite_Glyph: "
1164 "too many instructions (%d) for glyph with length %d\n",
1165 n_ins, loader->byte_len ));
1166 return TT_Err_Too_Many_Hints;
1167 }
1168
1169 tmp = loader->exec->glyphSize;
1170 error = Update_Max( loader->exec->memory,
1171 &tmp,
1172 sizeof ( FT_Byte ),
1173 (void*)&loader->exec->glyphIns,
1174 n_ins );
1175 loader->exec->glyphSize = (FT_UShort)tmp;
1176 if ( error )
1177 return error;
1178 }
1179 else if ( n_ins == 0 )
1180 return TT_Err_Ok;
1181
1182 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
1183 return error;
1184
1185 loader->glyph->control_data = loader->exec->glyphIns;
1186 loader->glyph->control_len = n_ins;
1187 }
1188
1189 #endif
1190
1191 tt_prepare_zone( &loader->zone, &loader->gloader->base,
1192 start_point, start_contour );
1193
1194 /* Some points are likely touched during execution of */
1195 /* instructions on components. So let's untouch them. */
1196 for ( i = start_point; i < loader->zone.n_points; i++ )
1197 loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH;
1198
1199 loader->zone.n_points += 4;
1200
1201 return TT_Hint_Glyph( loader, 1 );
1202 }
1203
1204
1205 /* Calculate the four phantom points. */
1206 /* The first two stand for horizontal origin and advance. */
1207 /* The last two stand for vertical origin and advance. */
1208 #define TT_LOADER_SET_PP( loader ) \
1209 do { \
1210 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \
1211 (loader)->pp1.y = 0; \
1212 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \
1213 (loader)->pp2.y = 0; \
1214 (loader)->pp3.x = 0; \
1215 (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \
1216 (loader)->pp4.x = 0; \
1217 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \
1218 } while ( 0 )
1219
1220
1221 /*************************************************************************/
1222 /* */
1223 /* <Function> */
1224 /* load_truetype_glyph */
1225 /* */
1226 /* <Description> */
1227 /* Loads a given truetype glyph. Handles composites and uses a */
1228 /* TT_Loader object. */
1229 /* */
1230 static FT_Error
1231 load_truetype_glyph( TT_Loader loader,
1232 FT_UInt glyph_index,
1233 FT_UInt recurse_count,
1234 FT_Bool header_only )
1235 {
1236 FT_Error error = TT_Err_Ok;
1237 FT_Fixed x_scale, y_scale;
1238 FT_ULong offset;
1239 TT_Face face = (TT_Face)loader->face;
1240 FT_GlyphLoader gloader = loader->gloader;
1241 FT_Bool opened_frame = 0;
1242
1243 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1244 FT_Vector* deltas = NULL;
1245 #endif
1246
1247 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1248 FT_StreamRec inc_stream;
1249 FT_Data glyph_data;
1250 FT_Bool glyph_data_loaded = 0;
1251 #endif
1252
1253
1254 /* some fonts have an incorrect value of `maxComponentDepth', */
1255 /* thus we allow depth 1 to catch the majority of them */
1256 if ( recurse_count > 1 &&
1257 recurse_count > face->max_profile.maxComponentDepth )
1258 {
1259 error = TT_Err_Invalid_Composite;
1260 goto Exit;
1261 }
1262
1263 /* check glyph index */
1264 if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
1265 {
1266 error = TT_Err_Invalid_Glyph_Index;
1267 goto Exit;
1268 }
1269
1270 loader->glyph_index = glyph_index;
1271
1272 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1273 {
1274 x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1275 y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1276 }
1277 else
1278 {
1279 x_scale = 0x10000L;
1280 y_scale = 0x10000L;
1281 }
1282
1283 tt_get_metrics( loader, glyph_index );
1284
1285 /* Set `offset' to the start of the glyph relative to the start of */
1286 /* the `glyf' table, and `byte_len' to the length of the glyph in */
1287 /* bytes. */
1288
1289 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1290
1291 /* If we are loading glyph data via the incremental interface, set */
1292 /* the loader stream to a memory stream reading the data returned */
1293 /* by the interface. */
1294 if ( face->root.internal->incremental_interface )
1295 {
1296 error = face->root.internal->incremental_interface->funcs->get_glyph_data(
1297 face->root.internal->incremental_interface->object,
1298 glyph_index, &glyph_data );
1299 if ( error )
1300 goto Exit;
1301
1302 glyph_data_loaded = 1;
1303 offset = 0;
1304 loader->byte_len = glyph_data.length;
1305
1306 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
1307 FT_Stream_OpenMemory( &inc_stream,
1308 glyph_data.pointer, glyph_data.length );
1309
1310 loader->stream = &inc_stream;
1311 }
1312 else
1313
1314 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
1315
1316 offset = tt_face_get_location( face, glyph_index,
1317 (FT_UInt*)&loader->byte_len );
1318
1319 if ( loader->byte_len > 0 )
1320 {
1321 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1322 /* for the incremental interface, `glyf_offset' is always zero */
1323 if ( !loader->glyf_offset &&
1324 !face->root.internal->incremental_interface )
1325 #else
1326 if ( !loader->glyf_offset )
1327 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
1328 {
1329 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
1330 error = TT_Err_Invalid_Table;
1331 goto Exit;
1332 }
1333
1334 error = face->access_glyph_frame( loader, glyph_index,
1335 loader->glyf_offset + offset,
1336 loader->byte_len );
1337 if ( error )
1338 goto Exit;
1339
1340 opened_frame = 1;
1341
1342 /* read glyph header first */
1343 error = face->read_glyph_header( loader );
1344 if ( error || header_only )
1345 goto Exit;
1346 }
1347
1348 if ( loader->byte_len == 0 || loader->n_contours == 0 )
1349 {
1350 loader->bbox.xMin = 0;
1351 loader->bbox.xMax = 0;
1352 loader->bbox.yMin = 0;
1353 loader->bbox.yMax = 0;
1354
1355 if ( header_only )
1356 goto Exit;
1357
1358 /* must initialize points before (possibly) overriding */
1359 /* glyph metrics from the incremental interface */
1360 TT_LOADER_SET_PP( loader );
1361
1362 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1363 tt_get_metrics_incr_overrides( loader, glyph_index );
1364 #endif
1365
1366 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1367
1368 if ( ((TT_Face)(loader->face))->doblend )
1369 {
1370 /* this must be done before scaling */
1371 FT_Memory memory = loader->face->memory;
1372
1373
1374 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
1375 glyph_index, &deltas, 4 );
1376 if ( error )
1377 goto Exit;
1378
1379 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;
1380 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;
1381 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;
1382 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;
1383
1384 FT_FREE( deltas );
1385 }
1386
1387 #endif
1388
1389 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1390 {
1391 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1392 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1393 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1394 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1395 }
1396
1397 error = TT_Err_Ok;
1398 goto Exit;
1399 }
1400
1401 /* must initialize points before (possibly) overriding */
1402 /* glyph metrics from the incremental interface */
1403 TT_LOADER_SET_PP( loader );
1404
1405 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1406 tt_get_metrics_incr_overrides( loader, glyph_index );
1407 #endif
1408
1409 /***********************************************************************/
1410 /***********************************************************************/
1411 /***********************************************************************/
1412
1413 /* if it is a simple glyph, load it */
1414
1415 if ( loader->n_contours > 0 )
1416 {
1417 error = face->read_simple_glyph( loader );
1418 if ( error )
1419 goto Exit;
1420
1421 /* all data have been read */
1422 face->forget_glyph_frame( loader );
1423 opened_frame = 0;
1424
1425 error = TT_Process_Simple_Glyph( loader );
1426 if ( error )
1427 goto Exit;
1428
1429 FT_GlyphLoader_Add( gloader );
1430 }
1431
1432 /***********************************************************************/
1433 /***********************************************************************/
1434 /***********************************************************************/
1435
1436 /* otherwise, load a composite! */
1437 else if ( loader->n_contours == -1 )
1438 {
1439 FT_UInt start_point;
1440 FT_UInt start_contour;
1441 FT_ULong ins_pos; /* position of composite instructions, if any */
1442
1443
1444 start_point = gloader->base.outline.n_points;
1445 start_contour = gloader->base.outline.n_contours;
1446
1447 /* for each subglyph, read composite header */
1448 error = face->read_composite_glyph( loader );
1449 if ( error )
1450 goto Exit;
1451
1452 /* store the offset of instructions */
1453 ins_pos = loader->ins_pos;
1454
1455 /* all data we need are read */
1456 face->forget_glyph_frame( loader );
1457 opened_frame = 0;
1458
1459 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1460
1461 if ( face->doblend )
1462 {
1463 FT_Int i, limit;
1464 FT_SubGlyph subglyph;
1465 FT_Memory memory = face->root.memory;
1466
1467
1468 /* this provides additional offsets */
1469 /* for each component's translation */
1470
1471 if ( ( error = TT_Vary_Get_Glyph_Deltas(
1472 face,
1473 glyph_index,
1474 &deltas,
1475 gloader->current.num_subglyphs + 4 )) != 0 )
1476 goto Exit;
1477
1478 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
1479 limit = gloader->current.num_subglyphs;
1480
1481 for ( i = 0; i < limit; ++i, ++subglyph )
1482 {
1483 if ( subglyph->flags & ARGS_ARE_XY_VALUES )
1484 {
1485 /* XXX: overflow check for subglyph->{arg1,arg2}. */
1486 /* deltas[i].{x,y} must be within signed 16-bit, */
1487 /* but the restriction of summed delta is not clear */
1488 subglyph->arg1 += (FT_Int16)deltas[i].x;
1489 subglyph->arg2 += (FT_Int16)deltas[i].y;
1490 }
1491 }
1492
1493 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;
1494 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;
1495 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;
1496 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;
1497
1498 FT_FREE( deltas );
1499 }
1500
1501 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1502
1503 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1504 {
1505 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1506 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1507 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1508 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1509 }
1510
1511 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
1512 /* `as is' in the glyph slot (the client application will be */
1513 /* responsible for interpreting these data)... */
1514 if ( loader->load_flags & FT_LOAD_NO_RECURSE )
1515 {
1516 FT_GlyphLoader_Add( gloader );
1517 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
1518
1519 goto Exit;
1520 }
1521
1522 /*********************************************************************/
1523 /*********************************************************************/
1524 /*********************************************************************/
1525
1526 {
1527 FT_UInt n, num_base_points;
1528 FT_SubGlyph subglyph = 0;
1529
1530 FT_UInt num_points = start_point;
1531 FT_UInt num_subglyphs = gloader->current.num_subglyphs;
1532 FT_UInt num_base_subgs = gloader->base.num_subglyphs;
1533
1534 FT_Stream old_stream = loader->stream;
1535 FT_Int old_byte_len = loader->byte_len;
1536
1537
1538 FT_GlyphLoader_Add( gloader );
1539
1540 /* read each subglyph independently */
1541 for ( n = 0; n < num_subglyphs; n++ )
1542 {
1543 FT_Vector pp[4];
1544
1545
1546 /* Each time we call load_truetype_glyph in this loop, the */
1547 /* value of `gloader.base.subglyphs' can change due to table */
1548 /* reallocations. We thus need to recompute the subglyph */
1549 /* pointer on each iteration. */
1550 subglyph = gloader->base.subglyphs + num_base_subgs + n;
1551
1552 pp[0] = loader->pp1;
1553 pp[1] = loader->pp2;
1554 pp[2] = loader->pp3;
1555 pp[3] = loader->pp4;
1556
1557 num_base_points = gloader->base.outline.n_points;
1558
1559 error = load_truetype_glyph( loader, subglyph->index,
1560 recurse_count + 1, FALSE );
1561 if ( error )
1562 goto Exit;
1563
1564 /* restore subglyph pointer */
1565 subglyph = gloader->base.subglyphs + num_base_subgs + n;
1566
1567 if ( !( subglyph->flags & USE_MY_METRICS ) )
1568 {
1569 loader->pp1 = pp[0];
1570 loader->pp2 = pp[1];
1571 loader->pp3 = pp[2];
1572 loader->pp4 = pp[3];
1573 }
1574
1575 num_points = gloader->base.outline.n_points;
1576
1577 if ( num_points == num_base_points )
1578 continue;
1579
1580 /* gloader->base.outline consists of three parts: */
1581 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
1582 /* */
1583 /* (1): exists from the beginning */
1584 /* (2): components that have been loaded so far */
1585 /* (3): the newly loaded component */
1586 TT_Process_Composite_Component( loader, subglyph, start_point,
1587 num_base_points );
1588 }
1589
1590 loader->stream = old_stream;
1591 loader->byte_len = old_byte_len;
1592
1593 /* process the glyph */
1594 loader->ins_pos = ins_pos;
1595 if ( IS_HINTED( loader->load_flags ) &&
1596
1597 #ifdef TT_USE_BYTECODE_INTERPRETER
1598
1599 subglyph->flags & WE_HAVE_INSTR &&
1600
1601 #endif
1602
1603 num_points > start_point )
1604 TT_Process_Composite_Glyph( loader, start_point, start_contour );
1605
1606 }
1607 }
1608 else
1609 {
1610 /* invalid composite count (negative but not -1) */
1611 error = TT_Err_Invalid_Outline;
1612 goto Exit;
1613 }
1614
1615 /***********************************************************************/
1616 /***********************************************************************/
1617 /***********************************************************************/
1618
1619 Exit:
1620
1621 if ( opened_frame )
1622 face->forget_glyph_frame( loader );
1623
1624 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1625
1626 if ( glyph_data_loaded )
1627 face->root.internal->incremental_interface->funcs->free_glyph_data(
1628 face->root.internal->incremental_interface->object,
1629 &glyph_data );
1630
1631 #endif
1632
1633 return error;
1634 }
1635
1636
1637 static FT_Error
1638 compute_glyph_metrics( TT_Loader loader,
1639 FT_UInt glyph_index )
1640 {
1641 FT_BBox bbox;
1642 TT_Face face = (TT_Face)loader->face;
1643 FT_Fixed y_scale;
1644 TT_GlyphSlot glyph = loader->glyph;
1645 TT_Size size = (TT_Size)loader->size;
1646
1647
1648 y_scale = 0x10000L;
1649 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1650 y_scale = size->root.metrics.y_scale;
1651
1652 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
1653 FT_Outline_Get_CBox( &glyph->outline, &bbox );
1654 else
1655 bbox = loader->bbox;
1656
1657 /* get the device-independent horizontal advance; it is scaled later */
1658 /* by the base layer. */
1659 {
1660 FT_Pos advance = loader->linear;
1661
1662
1663 /* the flag FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH was introduced to */
1664 /* correctly support DynaLab fonts, which have an incorrect */
1665 /* `advance_Width_Max' field! It is used, to my knowledge, */
1666 /* exclusively in the X-TrueType font server. */
1667 /* */
1668 if ( face->postscript.isFixedPitch &&
1669 ( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
1670 advance = face->horizontal.advance_Width_Max;
1671
1672 /* we need to return the advance in font units in linearHoriAdvance, */
1673 /* it will be scaled later by the base layer. */
1674 glyph->linearHoriAdvance = advance;
1675 }
1676
1677 glyph->metrics.horiBearingX = bbox.xMin;
1678 glyph->metrics.horiBearingY = bbox.yMax;
1679 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
1680
1681 /* adjust advance width to the value contained in the hdmx table */
1682 if ( !face->postscript.isFixedPitch &&
1683 IS_HINTED( loader->load_flags ) )
1684 {
1685 FT_Byte* widthp;
1686
1687
1688 widthp = tt_face_get_device_metrics( face,
1689 size->root.metrics.x_ppem,
1690 glyph_index );
1691
1692 if ( widthp )
1693 glyph->metrics.horiAdvance = *widthp << 6;
1694 }
1695
1696 /* set glyph dimensions */
1697 glyph->metrics.width = bbox.xMax - bbox.xMin;
1698 glyph->metrics.height = bbox.yMax - bbox.yMin;
1699
1700 /* Now take care of vertical metrics. In the case where there is */
1701 /* no vertical information within the font (relatively common), */
1702 /* create some metrics manually */
1703 {
1704 FT_Pos top; /* scaled vertical top side bearing */
1705 FT_Pos advance; /* scaled vertical advance height */
1706
1707
1708 /* Get the unscaled top bearing and advance height. */
1709 if ( face->vertical_info &&
1710 face->vertical.number_Of_VMetrics > 0 )
1711 {
1712 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
1713 y_scale );
1714
1715 if ( loader->pp3.y <= loader->pp4.y )
1716 advance = 0;
1717 else
1718 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
1719 y_scale );
1720 }
1721 else
1722 {
1723 FT_Pos height;
1724
1725
1726 /* XXX Compute top side bearing and advance height in */
1727 /* Get_VMetrics instead of here. */
1728
1729 /* NOTE: The OS/2 values are the only `portable' ones, */
1730 /* which is why we use them, if there is an OS/2 */
1731 /* table in the font. Otherwise, we use the */
1732 /* values defined in the horizontal header. */
1733
1734 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin,
1735 y_scale );
1736 if ( face->os2.version != 0xFFFFU )
1737 advance = (FT_Pos)( face->os2.sTypoAscender -
1738 face->os2.sTypoDescender );
1739 else
1740 advance = (FT_Pos)( face->horizontal.Ascender -
1741 face->horizontal.Descender );
1742
1743 top = ( advance - height ) / 2;
1744 }
1745
1746 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1747 {
1748 FT_Incremental_InterfaceRec* incr;
1749 FT_Incremental_MetricsRec metrics;
1750 FT_Error error;
1751
1752
1753 incr = face->root.internal->incremental_interface;
1754
1755 /* If this is an incrementally loaded font see if there are */
1756 /* overriding metrics for this glyph. */
1757 if ( incr && incr->funcs->get_glyph_metrics )
1758 {
1759 metrics.bearing_x = 0;
1760 metrics.bearing_y = top;
1761 metrics.advance = advance;
1762
1763 error = incr->funcs->get_glyph_metrics( incr->object,
1764 glyph_index,
1765 TRUE,
1766 &metrics );
1767 if ( error )
1768 return error;
1769
1770 top = metrics.bearing_y;
1771 advance = metrics.advance;
1772 }
1773 }
1774
1775 /* GWW: Do vertical metrics get loaded incrementally too? */
1776
1777 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
1778
1779 glyph->linearVertAdvance = advance;
1780
1781 /* scale the metrics */
1782 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1783 {
1784 top = FT_MulFix( top, y_scale );
1785 advance = FT_MulFix( advance, y_scale );
1786 }
1787
1788 /* XXX: for now, we have no better algorithm for the lsb, but it */
1789 /* should work fine. */
1790 /* */
1791 glyph->metrics.vertBearingX = glyph->metrics.horiBearingX -
1792 glyph->metrics.horiAdvance / 2;
1793 glyph->metrics.vertBearingY = top;
1794 glyph->metrics.vertAdvance = advance;
1795 }
1796
1797 return 0;
1798 }
1799
1800
1801 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
1802
1803 static FT_Error
1804 load_sbit_image( TT_Size size,
1805 TT_GlyphSlot glyph,
1806 FT_UInt glyph_index,
1807 FT_Int32 load_flags )
1808 {
1809 TT_Face face;
1810 SFNT_Service sfnt;
1811 FT_Stream stream;
1812 FT_Error error;
1813 TT_SBit_MetricsRec metrics;
1814
1815
1816 face = (TT_Face)glyph->face;
1817 sfnt = (SFNT_Service)face->sfnt;
1818 stream = face->root.stream;
1819
1820 error = sfnt->load_sbit_image( face,
1821 size->strike_index,
1822 glyph_index,
1823 (FT_Int)load_flags,
1824 stream,
1825 &glyph->bitmap,
1826 &metrics );
1827 if ( !error )
1828 {
1829 glyph->outline.n_points = 0;
1830 glyph->outline.n_contours = 0;
1831
1832 glyph->metrics.width = (FT_Pos)metrics.width << 6;
1833 glyph->metrics.height = (FT_Pos)metrics.height << 6;
1834
1835 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
1836 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
1837 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6;
1838
1839 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
1840 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
1841 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6;
1842
1843 glyph->format = FT_GLYPH_FORMAT_BITMAP;
1844
1845 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
1846 {
1847 glyph->bitmap_left = metrics.vertBearingX;
1848 glyph->bitmap_top = metrics.vertBearingY;
1849 }
1850 else
1851 {
1852 glyph->bitmap_left = metrics.horiBearingX;
1853 glyph->bitmap_top = metrics.horiBearingY;
1854 }
1855 }
1856
1857 return error;
1858 }
1859
1860 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
1861
1862
1863 static FT_Error
1864 tt_loader_init( TT_Loader loader,
1865 TT_Size size,
1866 TT_GlyphSlot glyph,
1867 FT_Int32 load_flags,
1868 FT_Bool glyf_table_only )
1869 {
1870 TT_Face face;
1871 FT_Stream stream;
1872
1873
1874 face = (TT_Face)glyph->face;
1875 stream = face->root.stream;
1876
1877 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) );
1878
1879 #ifdef TT_USE_BYTECODE_INTERPRETER
1880
1881 /* load execution context */
1882 if ( IS_HINTED( load_flags ) && !glyf_table_only )
1883 {
1884 TT_ExecContext exec;
1885 FT_Bool grayscale;
1886
1887
1888 if ( !size->cvt_ready )
1889 {
1890 FT_Error error = tt_size_ready_bytecode( size );
1891 if ( error )
1892 return error;
1893 }
1894
1895 /* query new execution context */
1896 exec = size->debug ? size->context
1897 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
1898 if ( !exec )
1899 return TT_Err_Could_Not_Find_Context;
1900
1901 grayscale =
1902 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
1903
1904 TT_Load_Context( exec, face, size );
1905
1906 /* a change from mono to grayscale rendering (and vice versa) */
1907 /* requires a re-execution of the CVT program */
1908 if ( grayscale != exec->grayscale )
1909 {
1910 FT_UInt i;
1911
1912
1913 FT_TRACE4(( "tt_loader_init: grayscale change,"
1914 " re-executing `prep' table\n" ));
1915
1916 exec->grayscale = grayscale;
1917
1918 for ( i = 0; i < size->cvt_size; i++ )
1919 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
1920 tt_size_run_prep( size );
1921 }
1922
1923 /* see whether the cvt program has disabled hinting */
1924 if ( exec->GS.instruct_control & 1 )
1925 load_flags |= FT_LOAD_NO_HINTING;
1926
1927 /* load default graphics state -- if needed */
1928 if ( exec->GS.instruct_control & 2 )
1929 exec->GS = tt_default_graphics_state;
1930
1931 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
1932 loader->exec = exec;
1933 loader->instructions = exec->glyphIns;
1934 }
1935
1936 #endif /* TT_USE_BYTECODE_INTERPRETER */
1937
1938 /* seek to the beginning of the glyph table -- for Type 42 fonts */
1939 /* the table might be accessed from a Postscript stream or something */
1940 /* else... */
1941
1942 #ifdef FT_CONFIG_OPTION_INCREMENTAL
1943
1944 if ( face->root.internal->incremental_interface )
1945 loader->glyf_offset = 0;
1946 else
1947
1948 #endif
1949
1950 {
1951 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 );
1952
1953
1954 if ( error == TT_Err_Table_Missing )
1955 loader->glyf_offset = 0;
1956 else if ( error )
1957 {
1958 FT_ERROR(( "tt_loader_init: could not access glyph table\n" ));
1959 return error;
1960 }
1961 else
1962 loader->glyf_offset = FT_STREAM_POS();
1963 }
1964
1965 /* get face's glyph loader */
1966 if ( !glyf_table_only )
1967 {
1968 FT_GlyphLoader gloader = glyph->internal->loader;
1969
1970
1971 FT_GlyphLoader_Rewind( gloader );
1972 loader->gloader = gloader;
1973 }
1974
1975 loader->load_flags = load_flags;
1976
1977 loader->face = (FT_Face)face;
1978 loader->size = (FT_Size)size;
1979 loader->glyph = (FT_GlyphSlot)glyph;
1980 loader->stream = stream;
1981
1982 return TT_Err_Ok;
1983 }
1984
1985
1986 /*************************************************************************/
1987 /* */
1988 /* <Function> */
1989 /* TT_Load_Glyph */
1990 /* */
1991 /* <Description> */
1992 /* A function used to load a single glyph within a given glyph slot, */
1993 /* for a given size. */
1994 /* */
1995 /* <Input> */
1996 /* glyph :: A handle to a target slot object where the glyph */
1997 /* will be loaded. */
1998 /* */
1999 /* size :: A handle to the source face size at which the glyph */
2000 /* must be scaled/loaded. */
2001 /* */
2002 /* glyph_index :: The index of the glyph in the font file. */
2003 /* */
2004 /* load_flags :: A flag indicating what to load for this glyph. The */
2005 /* FT_LOAD_XXX constants can be used to control the */
2006 /* glyph loading process (e.g., whether the outline */
2007 /* should be scaled, whether to load bitmaps or not, */
2008 /* whether to hint the outline, etc). */
2009 /* */
2010 /* <Return> */
2011 /* FreeType error code. 0 means success. */
2012 /* */
2013 FT_LOCAL_DEF( FT_Error )
2014 TT_Load_Glyph( TT_Size size,
2015 TT_GlyphSlot glyph,
2016 FT_UInt glyph_index,
2017 FT_Int32 load_flags )
2018 {
2019 TT_Face face;
2020 FT_Error error;
2021 TT_LoaderRec loader;
2022
2023
2024 face = (TT_Face)glyph->face;
2025 error = TT_Err_Ok;
2026
2027 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
2028
2029 /* try to load embedded bitmap if any */
2030 /* */
2031 /* XXX: The convention should be emphasized in */
2032 /* the documents because it can be confusing. */
2033 if ( size->strike_index != 0xFFFFFFFFUL &&
2034 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 )
2035 {
2036 error = load_sbit_image( size, glyph, glyph_index, load_flags );
2037 if ( !error )
2038 {
2039 FT_Face root = &face->root;
2040
2041
2042 if ( FT_IS_SCALABLE( root ) )
2043 {
2044 /* for the bbox we need the header only */
2045 (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE );
2046 (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE );
2047 glyph->linearHoriAdvance = loader.linear;
2048 glyph->linearVertAdvance = loader.top_bearing + loader.bbox.yMax -
2049 loader.vadvance;
2050 if ( face->postscript.isFixedPitch &&
2051 ( load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
2052 glyph->linearHoriAdvance = face->horizontal.advance_Width_Max;
2053 }
2054
2055 return TT_Err_Ok;
2056 }
2057 }
2058
2059 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
2060
2061 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */
2062 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid )
2063 return TT_Err_Invalid_Size_Handle;
2064
2065 if ( load_flags & FT_LOAD_SBITS_ONLY )
2066 return TT_Err_Invalid_Argument;
2067
2068 error = tt_loader_init( &loader, size, glyph, load_flags, FALSE );
2069 if ( error )
2070 return error;
2071
2072 glyph->format = FT_GLYPH_FORMAT_OUTLINE;
2073 glyph->num_subglyphs = 0;
2074 glyph->outline.flags = 0;
2075
2076 /* main loading loop */
2077 error = load_truetype_glyph( &loader, glyph_index, 0, FALSE );
2078 if ( !error )
2079 {
2080 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )
2081 {
2082 glyph->num_subglyphs = loader.gloader->base.num_subglyphs;
2083 glyph->subglyphs = loader.gloader->base.subglyphs;
2084 }
2085 else
2086 {
2087 glyph->outline = loader.gloader->base.outline;
2088 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;
2089
2090 /* Translate array so that (0,0) is the glyph's origin. Note */
2091 /* that this behaviour is independent on the value of bit 1 of */
2092 /* the `flags' field in the `head' table -- at least major */
2093 /* applications like Acroread indicate that. */
2094 if ( loader.pp1.x )
2095 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );
2096 }
2097
2098 #ifdef TT_USE_BYTECODE_INTERPRETER
2099
2100 if ( IS_HINTED( load_flags ) )
2101 {
2102 if ( loader.exec->GS.scan_control )
2103 {
2104 /* convert scan conversion mode to FT_OUTLINE_XXX flags */
2105 switch ( loader.exec->GS.scan_type )
2106 {
2107 case 0: /* simple drop-outs including stubs */
2108 glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS;
2109 break;
2110 case 1: /* simple drop-outs excluding stubs */
2111 /* nothing; it's the default rendering mode */
2112 break;
2113 case 4: /* smart drop-outs including stubs */
2114 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS |
2115 FT_OUTLINE_INCLUDE_STUBS;
2116 break;
2117 case 5: /* smart drop-outs excluding stubs */
2118 glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS;
2119 break;
2120
2121 default: /* no drop-out control */
2122 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2123 break;
2124 }
2125 }
2126 else
2127 glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2128 }
2129
2130 #endif /* TT_USE_BYTECODE_INTERPRETER */
2131
2132 compute_glyph_metrics( &loader, glyph_index );
2133 }
2134
2135 /* Set the `high precision' bit flag. */
2136 /* This is _critical_ to get correct output for monochrome */
2137 /* TrueType glyphs at all sizes using the bytecode interpreter. */
2138 /* */
2139 if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
2140 size->root.metrics.y_ppem < 24 )
2141 glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
2142
2143 return error;
2144 }
2145
2146
2147 /* END */
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