1
/***************************************************************************/
5
/* TrueType Glyph Loader (body). */
7
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, */
9
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
17
/***************************************************************************/
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
31
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
38
/*************************************************************************/
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. */
45
#define FT_COMPONENT trace_ttgload
48
/*************************************************************************/
50
/* Composite font flags. */
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
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
67
/*************************************************************************/
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. */
74
TT_Get_HMetrics( TT_Face face,
80
( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
82
if ( check && face->postscript.isFixedPitch )
83
*aw = face->horizontal.advance_Width_Max;
85
FT_TRACE5(( " advance width (font units): %d\n", *aw ));
86
FT_TRACE5(( " left side bearing (font units): %d\n", *lsb ));
90
/*************************************************************************/
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. */
100
/* The monospace `check' is probably not meaningful here, but we leave */
101
/* it in for a consistent interface. */
104
TT_Get_VMetrics( TT_Face face,
112
if ( face->vertical_info )
113
( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
115
#if 1 /* Empirically determined, at variance with what MS said */
120
*ah = face->root.units_per_EM;
123
#else /* This is what MS said to do. It isn't what they do, however. */
125
else if ( face->os2.version != 0xFFFFU )
127
*tsb = face->os2.sTypoAscender;
128
*ah = face->os2.sTypoAscender - face->os2.sTypoDescender;
132
*tsb = face->horizontal.Ascender;
133
*ah = face->horizontal.Ascender - face->horizontal.Descender;
138
FT_TRACE5(( " advance height (font units): %d\n", *ah ));
139
FT_TRACE5(( " top side bearing (font units): %d\n", *tsb ));
144
tt_get_metrics( TT_Loader loader,
145
FT_UInt glyph_index )
147
TT_Face face = (TT_Face)loader->face;
149
FT_Short left_bearing = 0, top_bearing = 0;
150
FT_UShort advance_width = 0, advance_height = 0;
153
TT_Get_HMetrics( face, glyph_index,
154
(FT_Bool)!( loader->load_flags &
155
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
158
TT_Get_VMetrics( face, glyph_index,
159
(FT_Bool)!( loader->load_flags &
160
FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ),
164
loader->left_bearing = left_bearing;
165
loader->advance = advance_width;
166
loader->top_bearing = top_bearing;
167
loader->vadvance = advance_height;
169
if ( !loader->linear_def )
171
loader->linear_def = 1;
172
loader->linear = advance_width;
177
#ifdef FT_CONFIG_OPTION_INCREMENTAL
180
tt_get_metrics_incr_overrides( TT_Loader loader,
181
FT_UInt glyph_index )
183
TT_Face face = (TT_Face)loader->face;
185
FT_Short left_bearing = 0, top_bearing = 0;
186
FT_UShort advance_width = 0, advance_height = 0;
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 )
194
FT_Incremental_MetricsRec metrics;
198
metrics.bearing_x = loader->left_bearing;
199
metrics.bearing_y = 0;
200
metrics.advance = loader->advance;
201
metrics.advance_v = 0;
203
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
204
face->root.internal->incremental_interface->object,
205
glyph_index, FALSE, &metrics );
209
left_bearing = (FT_Short)metrics.bearing_x;
210
advance_width = (FT_UShort)metrics.advance;
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;
219
error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
220
face->root.internal->incremental_interface->object,
221
glyph_index, TRUE, &metrics );
225
top_bearing = (FT_Short)metrics.bearing_y;
226
advance_height = (FT_UShort)metrics.advance;
230
loader->left_bearing = left_bearing;
231
loader->advance = advance_width;
232
loader->top_bearing = top_bearing;
233
loader->vadvance = advance_height;
235
if ( !loader->linear_def )
237
loader->linear_def = 1;
238
loader->linear = advance_width;
246
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
249
/*************************************************************************/
251
/* Translates an array of coordinates. */
254
translate_array( FT_UInt n,
263
for ( k = 0; k < n; k++ )
264
coords[k].x += delta_x;
267
for ( k = 0; k < n; k++ )
268
coords[k].y += delta_y;
273
#define IS_HINTED( flags ) ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
276
/*************************************************************************/
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. */
282
/*************************************************************************/
284
FT_CALLBACK_DEF( FT_Error )
285
TT_Access_Glyph_Frame( TT_Loader loader,
291
FT_Stream stream = loader->stream;
293
/* for non-debug mode */
294
FT_UNUSED( glyph_index );
297
FT_TRACE4(( "Glyph %ld\n", glyph_index ));
299
/* the following line sets the `error' variable through macros! */
300
if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
303
loader->cursor = stream->cursor;
304
loader->limit = stream->limit;
310
FT_CALLBACK_DEF( void )
311
TT_Forget_Glyph_Frame( TT_Loader loader )
313
FT_Stream stream = loader->stream;
320
FT_CALLBACK_DEF( FT_Error )
321
TT_Load_Glyph_Header( TT_Loader loader )
323
FT_Byte* p = loader->cursor;
324
FT_Byte* limit = loader->limit;
327
if ( p + 10 > limit )
328
return TT_Err_Invalid_Outline;
330
loader->n_contours = FT_NEXT_SHORT( p );
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 );
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 ));
348
FT_CALLBACK_DEF( FT_Error )
349
TT_Load_Simple_Glyph( TT_Loader load )
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;
357
TT_Face face = (TT_Face)load->face;
361
FT_Byte *flag, *flag_limit;
363
FT_Vector *vec, *vec_limit;
365
FT_Short *cont, *cont_limit, prev_cont;
369
/* check that we can add the contours to the glyph */
370
error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
374
/* reading the contours' endpoints & number of points */
375
cont = gloader->current.outline.contours;
376
cont_limit = cont + n_contours;
378
/* check space for contours array + instructions count */
379
if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
380
goto Invalid_Outline;
382
prev_cont = FT_NEXT_USHORT( p );
384
if ( n_contours > 0 )
387
for ( cont++; cont < cont_limit; cont++ )
389
cont[0] = FT_NEXT_USHORT( p );
390
if ( cont[0] <= prev_cont )
392
/* unordered contours: this is invalid */
393
error = TT_Err_Invalid_Table;
400
if ( n_contours > 0 )
402
n_points = cont[-1] + 1;
404
goto Invalid_Outline;
407
/* note that we will add four phantom points later */
408
error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
412
/* we'd better check the contours table right now */
413
outline = &gloader->current.outline;
415
for ( cont = outline->contours + 1; cont < cont_limit; cont++ )
416
if ( cont[-1] >= cont[0] )
417
goto Invalid_Outline;
419
/* reading the bytecode instructions */
420
load->glyph->control_len = 0;
421
load->glyph->control_data = 0;
424
goto Invalid_Outline;
426
n_ins = FT_NEXT_USHORT( p );
428
FT_TRACE5(( " Instructions size: %u\n", n_ins ));
430
if ( n_ins > face->max_profile.maxSizeOfInstructions )
432
FT_TRACE0(( "TT_Load_Simple_Glyph: too many instructions (%d)\n",
434
error = TT_Err_Too_Many_Hints;
438
if ( ( limit - p ) < n_ins )
440
FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));
441
error = TT_Err_Too_Many_Hints;
445
#ifdef TT_USE_BYTECODE_INTERPRETER
447
if ( IS_HINTED( load->load_flags ) )
449
load->glyph->control_len = n_ins;
450
load->glyph->control_data = load->exec->glyphIns;
452
FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
455
#endif /* TT_USE_BYTECODE_INTERPRETER */
459
/* reading the point tags */
460
flag = (FT_Byte*)outline->tags;
461
flag_limit = flag + n_points;
463
FT_ASSERT( flag != NULL );
465
while ( flag < flag_limit )
468
goto Invalid_Outline;
470
*flag++ = c = FT_NEXT_BYTE( p );
474
goto Invalid_Outline;
476
count = FT_NEXT_BYTE( p );
477
if ( flag + (FT_Int)count > flag_limit )
478
goto Invalid_Outline;
480
for ( ; count > 0; count-- )
485
/* reading the X coordinates */
487
vec = outline->points;
488
vec_limit = vec + n_points;
489
flag = (FT_Byte*)outline->tags;
492
if ( p + xy_size > limit )
493
goto Invalid_Outline;
495
for ( ; vec < vec_limit; vec++, flag++ )
504
goto Invalid_Outline;
506
y = (FT_Pos)FT_NEXT_BYTE( p );
507
if ( ( f & 16 ) == 0 )
510
else if ( ( f & 16 ) == 0 )
513
goto Invalid_Outline;
515
y = (FT_Pos)FT_NEXT_SHORT( p );
520
/* the cast is for stupid compilers */
521
*flag = (FT_Byte)( f & ~( 2 | 16 ) );
524
/* reading the Y coordinates */
526
vec = gloader->current.outline.points;
527
vec_limit = vec + n_points;
528
flag = (FT_Byte*)outline->tags;
531
for ( ; vec < vec_limit; vec++, flag++ )
540
goto Invalid_Outline;
542
y = (FT_Pos)FT_NEXT_BYTE( p );
543
if ( ( f & 32 ) == 0 )
546
else if ( ( f & 32 ) == 0 )
549
goto Invalid_Outline;
551
y = (FT_Pos)FT_NEXT_SHORT( p );
556
/* the cast is for stupid compilers */
557
*flag = (FT_Byte)( f & FT_CURVE_TAG_ON );
560
outline->n_points = (FT_UShort)n_points;
561
outline->n_contours = (FT_Short) n_contours;
569
error = TT_Err_Invalid_Outline;
574
FT_CALLBACK_DEF( FT_Error )
575
TT_Load_Composite_Glyph( TT_Loader loader )
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;
589
FT_Fixed xx, xy, yy, yx;
593
/* check that we can load a new subglyph */
594
error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
600
goto Invalid_Composite;
602
subglyph = gloader->current.subglyphs + num_subglyphs;
604
subglyph->arg1 = subglyph->arg2 = 0;
606
subglyph->flags = FT_NEXT_USHORT( p );
607
subglyph->index = FT_NEXT_USHORT( p );
611
if ( subglyph->flags & ARGS_ARE_WORDS )
613
if ( subglyph->flags & WE_HAVE_A_SCALE )
615
else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
617
else if ( subglyph->flags & WE_HAVE_A_2X2 )
620
if ( p + count > limit )
621
goto Invalid_Composite;
624
if ( subglyph->flags & ARGS_ARE_WORDS )
626
subglyph->arg1 = FT_NEXT_SHORT( p );
627
subglyph->arg2 = FT_NEXT_SHORT( p );
631
subglyph->arg1 = FT_NEXT_CHAR( p );
632
subglyph->arg2 = FT_NEXT_CHAR( p );
639
if ( subglyph->flags & WE_HAVE_A_SCALE )
641
xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
644
else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
646
xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
647
yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
649
else if ( subglyph->flags & WE_HAVE_A_2X2 )
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;
657
subglyph->transform.xx = xx;
658
subglyph->transform.xy = xy;
659
subglyph->transform.yx = yx;
660
subglyph->transform.yy = yy;
664
} while ( subglyph->flags & MORE_COMPONENTS );
666
gloader->current.num_subglyphs = num_subglyphs;
668
#ifdef TT_USE_BYTECODE_INTERPRETER
671
FT_Stream stream = loader->stream;
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. */
678
loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
690
error = TT_Err_Invalid_Composite;
696
TT_Init_Glyph_Loading( TT_Face face )
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;
707
tt_prepare_zone( TT_GlyphZone zone,
710
FT_UInt start_contour )
712
zone->n_points = (FT_UShort)( load->outline.n_points - start_point );
713
zone->n_contours = (FT_Short) ( load->outline.n_contours -
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;
724
/*************************************************************************/
730
/* Hint the glyph using the zone prepared by the caller. Note that */
731
/* the zone is supposed to include four phantom points. */
734
TT_Hint_Glyph( TT_Loader loader,
735
FT_Bool is_composite )
737
TT_GlyphZone zone = &loader->zone;
740
#ifdef TT_USE_BYTECODE_INTERPRETER
743
FT_UNUSED( is_composite );
747
#ifdef TT_USE_BYTECODE_INTERPRETER
748
if ( loader->glyph->control_len > 0xFFFFL )
750
FT_TRACE1(( "TT_Hint_Glyph: too long instructions " ));
751
FT_TRACE1(( "(0x%lx byte) is truncated\n",
752
loader->glyph->control_len ));
754
n_ins = (FT_UInt)( loader->glyph->control_len );
757
origin = zone->cur[zone->n_points - 4].x;
758
origin = FT_PIX_ROUND( origin ) - origin;
760
translate_array( zone->n_points, zone->cur, origin, 0 );
762
#ifdef TT_USE_BYTECODE_INTERPRETER
763
/* save original point position in org */
765
FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
767
/* Reset graphics state. */
768
loader->exec->GS = ((TT_Size)loader->size)->GS;
770
/* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
771
/* completely refer to the (already) hinted subglyphs. */
774
loader->exec->metrics.x_scale = 1 << 16;
775
loader->exec->metrics.y_scale = 1 << 16;
777
FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
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;
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 );
794
#ifdef TT_USE_BYTECODE_INTERPRETER
801
FT_GlyphLoader gloader = loader->gloader;
802
FT_Outline current_outline = gloader->current.outline;
805
error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
806
loader->exec->glyphIns, n_ins );
810
loader->exec->is_composite = is_composite;
811
loader->exec->pts = *zone;
813
debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&
814
((TT_Size)loader->size)->debug );
816
error = TT_Run_Context( loader->exec, debug );
817
if ( error && loader->exec->pedantic_hinting )
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;
827
/* save glyph phantom points */
828
if ( !loader->preserve_pps )
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];
840
/*************************************************************************/
843
/* TT_Process_Simple_Glyph */
846
/* Once a simple glyph has been loaded, it needs to be processed. */
847
/* Usually, this means scaling and hinting through bytecode */
848
/* interpretation. */
851
TT_Process_Simple_Glyph( TT_Loader loader )
853
FT_GlyphLoader gloader = loader->gloader;
854
FT_Error error = TT_Err_Ok;
859
outline = &gloader->current.outline;
860
n_points = outline->n_points;
862
/* set phantom points */
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;
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;
876
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
878
if ( ((TT_Face)loader->face)->doblend )
880
/* Deltas apply to the unscaled data. */
882
FT_Memory memory = loader->face->memory;
886
error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
893
for ( i = 0; i < n_points; ++i )
895
outline->points[i].x += deltas[i].x;
896
outline->points[i].y += deltas[i].y;
902
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
904
if ( IS_HINTED( loader->load_flags ) )
906
tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
908
FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
909
loader->zone.n_points + 4 );
912
/* scale the glyph */
913
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
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;
921
for ( ; vec < limit; vec++ )
923
vec->x = FT_MulFix( vec->x, x_scale );
924
vec->y = FT_MulFix( vec->y, y_scale );
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];
933
if ( IS_HINTED( loader->load_flags ) )
935
loader->zone.n_points += 4;
937
error = TT_Hint_Glyph( loader, 0 );
944
/*************************************************************************/
947
/* TT_Process_Composite_Component */
950
/* Once a composite component has been loaded, it needs to be */
951
/* processed. Usually, this means transforming and translating. */
954
TT_Process_Composite_Component( TT_Loader loader,
955
FT_SubGlyph subglyph,
957
FT_UInt num_base_points )
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;
966
have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE |
967
WE_HAVE_AN_XY_SCALE |
970
/* perform the transform required for this subglyph */
976
for ( i = num_base_points; i < num_points; i++ )
977
FT_Vector_Transform( base_vec + i, &subglyph->transform );
981
if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
983
FT_UInt k = subglyph->arg1;
984
FT_UInt l = subglyph->arg2;
989
/* match l-th point of the newly loaded component to the k-th point */
990
/* of the previously loaded components. */
992
/* change to the point numbers used by our outline */
994
l += num_base_points;
995
if ( k >= num_base_points ||
997
return TT_Err_Invalid_Composite;
999
p1 = gloader->base.outline.points + k;
1000
p2 = gloader->base.outline.points + l;
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. */
1018
#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
1019
!( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
1021
( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
1027
/*************************************************************************/
1029
/* This algorithm is what Apple documents. But it doesn't work. */
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;
1043
if ( a - b <= 33 && a - b >= -33 )
1045
if ( c - d <= 33 && c - d >= -33 )
1047
x = FT_MulFix( x, m );
1048
y = FT_MulFix( y, n );
1052
/*************************************************************************/
1054
/* This algorithm is a guess and works much better than the above. */
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 ) );
1068
x = FT_MulFix( x, mac_xscale );
1069
y = FT_MulFix( y, mac_yscale );
1075
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1077
FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1078
FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1081
x = FT_MulFix( x, x_scale );
1082
y = FT_MulFix( y, y_scale );
1084
if ( subglyph->flags & ROUND_XY_TO_GRID )
1086
x = FT_PIX_ROUND( x );
1087
y = FT_PIX_ROUND( y );
1093
translate_array( num_points - num_base_points,
1094
base_vec + num_base_points,
1101
/*************************************************************************/
1104
/* TT_Process_Composite_Glyph */
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. */
1112
TT_Process_Composite_Glyph( TT_Loader loader,
1113
FT_UInt start_point,
1114
FT_UInt start_contour )
1117
FT_Outline* outline;
1121
outline = &loader->gloader->base.outline;
1123
/* make room for phantom points */
1124
error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
1125
outline->n_points + 4,
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;
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;
1140
#ifdef TT_USE_BYTECODE_INTERPRETER
1143
FT_Stream stream = loader->stream;
1144
FT_UShort n_ins, max_ins;
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 ) )
1154
FT_TRACE5(( " Instructions size = %d\n", n_ins ));
1157
max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions;
1158
if ( n_ins > max_ins )
1160
/* acroread ignores this field, so we only do a rough safety check */
1161
if ( (FT_Int)n_ins > loader->byte_len )
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;
1169
tmp = loader->exec->glyphSize;
1170
error = Update_Max( loader->exec->memory,
1173
(void*)&loader->exec->glyphIns,
1175
loader->exec->glyphSize = (FT_UShort)tmp;
1179
else if ( n_ins == 0 )
1182
if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
1185
loader->glyph->control_data = loader->exec->glyphIns;
1186
loader->glyph->control_len = n_ins;
1191
tt_prepare_zone( &loader->zone, &loader->gloader->base,
1192
start_point, start_contour );
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;
1199
loader->zone.n_points += 4;
1201
return TT_Hint_Glyph( loader, 1 );
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 ) \
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; \
1221
/*************************************************************************/
1224
/* load_truetype_glyph */
1227
/* Loads a given truetype glyph. Handles composites and uses a */
1228
/* TT_Loader object. */
1231
load_truetype_glyph( TT_Loader loader,
1232
FT_UInt glyph_index,
1233
FT_UInt recurse_count,
1234
FT_Bool header_only )
1236
FT_Error error = TT_Err_Ok;
1237
FT_Fixed x_scale, y_scale;
1239
TT_Face face = (TT_Face)loader->face;
1240
FT_GlyphLoader gloader = loader->gloader;
1241
FT_Bool opened_frame = 0;
1243
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1244
FT_Vector* deltas = NULL;
1247
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1248
FT_StreamRec inc_stream;
1250
FT_Bool glyph_data_loaded = 0;
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 )
1259
error = TT_Err_Invalid_Composite;
1263
/* check glyph index */
1264
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
1266
error = TT_Err_Invalid_Glyph_Index;
1270
loader->glyph_index = glyph_index;
1272
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1274
x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1275
y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1283
tt_get_metrics( loader, glyph_index );
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 */
1289
#ifdef FT_CONFIG_OPTION_INCREMENTAL
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 )
1296
error = face->root.internal->incremental_interface->funcs->get_glyph_data(
1297
face->root.internal->incremental_interface->object,
1298
glyph_index, &glyph_data );
1302
glyph_data_loaded = 1;
1304
loader->byte_len = glyph_data.length;
1306
FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
1307
FT_Stream_OpenMemory( &inc_stream,
1308
glyph_data.pointer, glyph_data.length );
1310
loader->stream = &inc_stream;
1314
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
1316
offset = tt_face_get_location( face, glyph_index,
1317
(FT_UInt*)&loader->byte_len );
1319
if ( loader->byte_len > 0 )
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 )
1326
if ( !loader->glyf_offset )
1327
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
1329
FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
1330
error = TT_Err_Invalid_Table;
1334
error = face->access_glyph_frame( loader, glyph_index,
1335
loader->glyf_offset + offset,
1342
/* read glyph header first */
1343
error = face->read_glyph_header( loader );
1344
if ( error || header_only )
1348
if ( loader->byte_len == 0 || loader->n_contours == 0 )
1350
loader->bbox.xMin = 0;
1351
loader->bbox.xMax = 0;
1352
loader->bbox.yMin = 0;
1353
loader->bbox.yMax = 0;
1358
/* must initialize points before (possibly) overriding */
1359
/* glyph metrics from the incremental interface */
1360
TT_LOADER_SET_PP( loader );
1362
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1363
tt_get_metrics_incr_overrides( loader, glyph_index );
1366
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1368
if ( ((TT_Face)(loader->face))->doblend )
1370
/* this must be done before scaling */
1371
FT_Memory memory = loader->face->memory;
1374
error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
1375
glyph_index, &deltas, 4 );
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;
1389
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
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 );
1401
/* must initialize points before (possibly) overriding */
1402
/* glyph metrics from the incremental interface */
1403
TT_LOADER_SET_PP( loader );
1405
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1406
tt_get_metrics_incr_overrides( loader, glyph_index );
1409
/***********************************************************************/
1410
/***********************************************************************/
1411
/***********************************************************************/
1413
/* if it is a simple glyph, load it */
1415
if ( loader->n_contours > 0 )
1417
error = face->read_simple_glyph( loader );
1421
/* all data have been read */
1422
face->forget_glyph_frame( loader );
1425
error = TT_Process_Simple_Glyph( loader );
1429
FT_GlyphLoader_Add( gloader );
1432
/***********************************************************************/
1433
/***********************************************************************/
1434
/***********************************************************************/
1436
/* otherwise, load a composite! */
1437
else if ( loader->n_contours == -1 )
1439
FT_UInt start_point;
1440
FT_UInt start_contour;
1441
FT_ULong ins_pos; /* position of composite instructions, if any */
1444
start_point = gloader->base.outline.n_points;
1445
start_contour = gloader->base.outline.n_contours;
1447
/* for each subglyph, read composite header */
1448
error = face->read_composite_glyph( loader );
1452
/* store the offset of instructions */
1453
ins_pos = loader->ins_pos;
1455
/* all data we need are read */
1456
face->forget_glyph_frame( loader );
1459
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1461
if ( face->doblend )
1464
FT_SubGlyph subglyph;
1465
FT_Memory memory = face->root.memory;
1468
/* this provides additional offsets */
1469
/* for each component's translation */
1471
if ( ( error = TT_Vary_Get_Glyph_Deltas(
1475
gloader->current.num_subglyphs + 4 )) != 0 )
1478
subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
1479
limit = gloader->current.num_subglyphs;
1481
for ( i = 0; i < limit; ++i, ++subglyph )
1483
if ( subglyph->flags & ARGS_ARE_XY_VALUES )
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;
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;
1501
#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1503
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
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 );
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 )
1516
FT_GlyphLoader_Add( gloader );
1517
loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
1522
/*********************************************************************/
1523
/*********************************************************************/
1524
/*********************************************************************/
1527
FT_UInt n, num_base_points;
1528
FT_SubGlyph subglyph = 0;
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;
1534
FT_Stream old_stream = loader->stream;
1535
FT_Int old_byte_len = loader->byte_len;
1538
FT_GlyphLoader_Add( gloader );
1540
/* read each subglyph independently */
1541
for ( n = 0; n < num_subglyphs; n++ )
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;
1552
pp[0] = loader->pp1;
1553
pp[1] = loader->pp2;
1554
pp[2] = loader->pp3;
1555
pp[3] = loader->pp4;
1557
num_base_points = gloader->base.outline.n_points;
1559
error = load_truetype_glyph( loader, subglyph->index,
1560
recurse_count + 1, FALSE );
1564
/* restore subglyph pointer */
1565
subglyph = gloader->base.subglyphs + num_base_subgs + n;
1567
if ( !( subglyph->flags & USE_MY_METRICS ) )
1569
loader->pp1 = pp[0];
1570
loader->pp2 = pp[1];
1571
loader->pp3 = pp[2];
1572
loader->pp4 = pp[3];
1575
num_points = gloader->base.outline.n_points;
1577
if ( num_points == num_base_points )
1580
/* gloader->base.outline consists of three parts: */
1581
/* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */
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,
1590
loader->stream = old_stream;
1591
loader->byte_len = old_byte_len;
1593
/* process the glyph */
1594
loader->ins_pos = ins_pos;
1595
if ( IS_HINTED( loader->load_flags ) &&
1597
#ifdef TT_USE_BYTECODE_INTERPRETER
1599
subglyph->flags & WE_HAVE_INSTR &&
1603
num_points > start_point )
1604
TT_Process_Composite_Glyph( loader, start_point, start_contour );
1610
/* invalid composite count (negative but not -1) */
1611
error = TT_Err_Invalid_Outline;
1615
/***********************************************************************/
1616
/***********************************************************************/
1617
/***********************************************************************/
1622
face->forget_glyph_frame( loader );
1624
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1626
if ( glyph_data_loaded )
1627
face->root.internal->incremental_interface->funcs->free_glyph_data(
1628
face->root.internal->incremental_interface->object,
1638
compute_glyph_metrics( TT_Loader loader,
1639
FT_UInt glyph_index )
1642
TT_Face face = (TT_Face)loader->face;
1644
TT_GlyphSlot glyph = loader->glyph;
1645
TT_Size size = (TT_Size)loader->size;
1649
if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1650
y_scale = size->root.metrics.y_scale;
1652
if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )
1653
FT_Outline_Get_CBox( &glyph->outline, &bbox );
1655
bbox = loader->bbox;
1657
/* get the device-independent horizontal advance; it is scaled later */
1658
/* by the base layer. */
1660
FT_Pos advance = loader->linear;
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. */
1668
if ( face->postscript.isFixedPitch &&
1669
( loader->load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
1670
advance = face->horizontal.advance_Width_Max;
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;
1677
glyph->metrics.horiBearingX = bbox.xMin;
1678
glyph->metrics.horiBearingY = bbox.yMax;
1679
glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;
1681
/* adjust advance width to the value contained in the hdmx table */
1682
if ( !face->postscript.isFixedPitch &&
1683
IS_HINTED( loader->load_flags ) )
1688
widthp = tt_face_get_device_metrics( face,
1689
size->root.metrics.x_ppem,
1693
glyph->metrics.horiAdvance = *widthp << 6;
1696
/* set glyph dimensions */
1697
glyph->metrics.width = bbox.xMax - bbox.xMin;
1698
glyph->metrics.height = bbox.yMax - bbox.yMin;
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 */
1704
FT_Pos top; /* scaled vertical top side bearing */
1705
FT_Pos advance; /* scaled vertical advance height */
1708
/* Get the unscaled top bearing and advance height. */
1709
if ( face->vertical_info &&
1710
face->vertical.number_Of_VMetrics > 0 )
1712
top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,
1715
if ( loader->pp3.y <= loader->pp4.y )
1718
advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,
1726
/* XXX Compute top side bearing and advance height in */
1727
/* Get_VMetrics instead of here. */
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. */
1734
height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin,
1736
if ( face->os2.version != 0xFFFFU )
1737
advance = (FT_Pos)( face->os2.sTypoAscender -
1738
face->os2.sTypoDescender );
1740
advance = (FT_Pos)( face->horizontal.Ascender -
1741
face->horizontal.Descender );
1743
top = ( advance - height ) / 2;
1746
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1748
FT_Incremental_InterfaceRec* incr;
1749
FT_Incremental_MetricsRec metrics;
1753
incr = face->root.internal->incremental_interface;
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 )
1759
metrics.bearing_x = 0;
1760
metrics.bearing_y = top;
1761
metrics.advance = advance;
1763
error = incr->funcs->get_glyph_metrics( incr->object,
1770
top = metrics.bearing_y;
1771
advance = metrics.advance;
1775
/* GWW: Do vertical metrics get loaded incrementally too? */
1777
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
1779
glyph->linearVertAdvance = advance;
1781
/* scale the metrics */
1782
if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1784
top = FT_MulFix( top, y_scale );
1785
advance = FT_MulFix( advance, y_scale );
1788
/* XXX: for now, we have no better algorithm for the lsb, but it */
1789
/* should work fine. */
1791
glyph->metrics.vertBearingX = glyph->metrics.horiBearingX -
1792
glyph->metrics.horiAdvance / 2;
1793
glyph->metrics.vertBearingY = top;
1794
glyph->metrics.vertAdvance = advance;
1801
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
1804
load_sbit_image( TT_Size size,
1806
FT_UInt glyph_index,
1807
FT_Int32 load_flags )
1813
TT_SBit_MetricsRec metrics;
1816
face = (TT_Face)glyph->face;
1817
sfnt = (SFNT_Service)face->sfnt;
1818
stream = face->root.stream;
1820
error = sfnt->load_sbit_image( face,
1829
glyph->outline.n_points = 0;
1830
glyph->outline.n_contours = 0;
1832
glyph->metrics.width = (FT_Pos)metrics.width << 6;
1833
glyph->metrics.height = (FT_Pos)metrics.height << 6;
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;
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;
1843
glyph->format = FT_GLYPH_FORMAT_BITMAP;
1845
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
1847
glyph->bitmap_left = metrics.vertBearingX;
1848
glyph->bitmap_top = metrics.vertBearingY;
1852
glyph->bitmap_left = metrics.horiBearingX;
1853
glyph->bitmap_top = metrics.horiBearingY;
1860
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
1864
tt_loader_init( TT_Loader loader,
1867
FT_Int32 load_flags,
1868
FT_Bool glyf_table_only )
1874
face = (TT_Face)glyph->face;
1875
stream = face->root.stream;
1877
FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) );
1879
#ifdef TT_USE_BYTECODE_INTERPRETER
1881
/* load execution context */
1882
if ( IS_HINTED( load_flags ) && !glyf_table_only )
1884
TT_ExecContext exec;
1888
if ( !size->cvt_ready )
1890
FT_Error error = tt_size_ready_bytecode( size );
1895
/* query new execution context */
1896
exec = size->debug ? size->context
1897
: ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
1899
return TT_Err_Could_Not_Find_Context;
1902
FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) != FT_RENDER_MODE_MONO );
1904
TT_Load_Context( exec, face, size );
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 )
1913
FT_TRACE4(( "tt_loader_init: grayscale change,"
1914
" re-executing `prep' table\n" ));
1916
exec->grayscale = grayscale;
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 );
1923
/* see whether the cvt program has disabled hinting */
1924
if ( exec->GS.instruct_control & 1 )
1925
load_flags |= FT_LOAD_NO_HINTING;
1927
/* load default graphics state -- if needed */
1928
if ( exec->GS.instruct_control & 2 )
1929
exec->GS = tt_default_graphics_state;
1931
exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );
1932
loader->exec = exec;
1933
loader->instructions = exec->glyphIns;
1936
#endif /* TT_USE_BYTECODE_INTERPRETER */
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 */
1942
#ifdef FT_CONFIG_OPTION_INCREMENTAL
1944
if ( face->root.internal->incremental_interface )
1945
loader->glyf_offset = 0;
1951
FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 );
1954
if ( error == TT_Err_Table_Missing )
1955
loader->glyf_offset = 0;
1958
FT_ERROR(( "tt_loader_init: could not access glyph table\n" ));
1962
loader->glyf_offset = FT_STREAM_POS();
1965
/* get face's glyph loader */
1966
if ( !glyf_table_only )
1968
FT_GlyphLoader gloader = glyph->internal->loader;
1971
FT_GlyphLoader_Rewind( gloader );
1972
loader->gloader = gloader;
1975
loader->load_flags = load_flags;
1977
loader->face = (FT_Face)face;
1978
loader->size = (FT_Size)size;
1979
loader->glyph = (FT_GlyphSlot)glyph;
1980
loader->stream = stream;
1986
/*************************************************************************/
1992
/* A function used to load a single glyph within a given glyph slot, */
1993
/* for a given size. */
1996
/* glyph :: A handle to a target slot object where the glyph */
1997
/* will be loaded. */
1999
/* size :: A handle to the source face size at which the glyph */
2000
/* must be scaled/loaded. */
2002
/* glyph_index :: The index of the glyph in the font file. */
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). */
2011
/* FreeType error code. 0 means success. */
2013
FT_LOCAL_DEF( FT_Error )
2014
TT_Load_Glyph( TT_Size size,
2016
FT_UInt glyph_index,
2017
FT_Int32 load_flags )
2021
TT_LoaderRec loader;
2024
face = (TT_Face)glyph->face;
2027
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
2029
/* try to load embedded bitmap if any */
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 )
2036
error = load_sbit_image( size, glyph, glyph_index, load_flags );
2039
FT_Face root = &face->root;
2042
if ( FT_IS_SCALABLE( root ) )
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 -
2050
if ( face->postscript.isFixedPitch &&
2051
( load_flags & FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ) == 0 )
2052
glyph->linearHoriAdvance = face->horizontal.advance_Width_Max;
2059
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
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;
2065
if ( load_flags & FT_LOAD_SBITS_ONLY )
2066
return TT_Err_Invalid_Argument;
2068
error = tt_loader_init( &loader, size, glyph, load_flags, FALSE );
2072
glyph->format = FT_GLYPH_FORMAT_OUTLINE;
2073
glyph->num_subglyphs = 0;
2074
glyph->outline.flags = 0;
2076
/* main loading loop */
2077
error = load_truetype_glyph( &loader, glyph_index, 0, FALSE );
2080
if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )
2082
glyph->num_subglyphs = loader.gloader->base.num_subglyphs;
2083
glyph->subglyphs = loader.gloader->base.subglyphs;
2087
glyph->outline = loader.gloader->base.outline;
2088
glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;
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. */
2095
FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );
2098
#ifdef TT_USE_BYTECODE_INTERPRETER
2100
if ( IS_HINTED( load_flags ) )
2102
if ( loader.exec->GS.scan_control )
2104
/* convert scan conversion mode to FT_OUTLINE_XXX flags */
2105
switch ( loader.exec->GS.scan_type )
2107
case 0: /* simple drop-outs including stubs */
2108
glyph->outline.flags |= FT_OUTLINE_INCLUDE_STUBS;
2110
case 1: /* simple drop-outs excluding stubs */
2111
/* nothing; it's the default rendering mode */
2113
case 4: /* smart drop-outs including stubs */
2114
glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS |
2115
FT_OUTLINE_INCLUDE_STUBS;
2117
case 5: /* smart drop-outs excluding stubs */
2118
glyph->outline.flags |= FT_OUTLINE_SMART_DROPOUTS;
2121
default: /* no drop-out control */
2122
glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2127
glyph->outline.flags |= FT_OUTLINE_IGNORE_DROPOUTS;
2130
#endif /* TT_USE_BYTECODE_INTERPRETER */
2132
compute_glyph_metrics( &loader, glyph_index );
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. */
2139
if ( !( load_flags & FT_LOAD_NO_SCALE ) &&
2140
size->root.metrics.y_ppem < 24 )
2141
glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
added
removed
tests/freetype/src/truetype/ttgload.c
