1/****************************************************************************
2 *
3 * ttsbit.c
4 *
5 * TrueType and OpenType embedded bitmap support (body).
6 *
7 * Copyright (C) 2005-2023 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
9 *
10 * Copyright 2013 by Google, Inc.
11 * Google Author(s): Behdad Esfahbod.
12 *
13 * This file is part of the FreeType project, and may only be used,
14 * modified, and distributed under the terms of the FreeType project
15 * license, LICENSE.TXT. By continuing to use, modify, or distribute
16 * this file you indicate that you have read the license and
17 * understand and accept it fully.
18 *
19 */
20
21
22#include <freetype/internal/ftdebug.h>
23#include <freetype/internal/ftstream.h>
24#include <freetype/tttags.h>
25#include <freetype/ftbitmap.h>
26
27
28#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
29
30#include "ttsbit.h"
31
32#include "sferrors.h"
33
34#include "ttmtx.h"
35#include "pngshim.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 ttsbit
46
47
48 FT_LOCAL_DEF( FT_Error )
49 tt_face_load_sbit( TT_Face face,
50 FT_Stream stream )
51 {
52 FT_Error error;
53 FT_ULong table_size;
54 FT_ULong table_start;
55
56
57 face->sbit_table = NULL;
58 face->sbit_table_size = 0;
59 face->sbit_table_type = TT_SBIT_TABLE_TYPE_NONE;
60 face->sbit_num_strikes = 0;
61
62 error = face->goto_table( face, TTAG_CBLC, stream, &table_size );
63 if ( !error )
64 face->sbit_table_type = TT_SBIT_TABLE_TYPE_CBLC;
65 else
66 {
67 error = face->goto_table( face, TTAG_EBLC, stream, &table_size );
68 if ( error )
69 error = face->goto_table( face, TTAG_bloc, stream, &table_size );
70 if ( !error )
71 face->sbit_table_type = TT_SBIT_TABLE_TYPE_EBLC;
72 }
73
74 if ( error )
75 {
76 error = face->goto_table( face, TTAG_sbix, stream, &table_size );
77 if ( !error )
78 face->sbit_table_type = TT_SBIT_TABLE_TYPE_SBIX;
79 }
80 if ( error )
81 goto Exit;
82
83 if ( table_size < 8 )
84 {
85 FT_ERROR(( "tt_face_load_sbit_strikes: table too short\n" ));
86 error = FT_THROW( Invalid_File_Format );
87 goto Exit;
88 }
89
90 table_start = FT_STREAM_POS();
91
92 switch ( (FT_UInt)face->sbit_table_type )
93 {
94 case TT_SBIT_TABLE_TYPE_EBLC:
95 case TT_SBIT_TABLE_TYPE_CBLC:
96 {
97 FT_Byte* p;
98 FT_Fixed version;
99 FT_ULong num_strikes;
100 FT_UInt count;
101
102
103 if ( FT_FRAME_EXTRACT( table_size, face->sbit_table ) )
104 goto Exit;
105
106 face->sbit_table_size = table_size;
107
108 p = face->sbit_table;
109
110 version = FT_NEXT_LONG( p );
111 num_strikes = FT_NEXT_ULONG( p );
112
113 /* there's at least one font (FZShuSong-Z01, version 3) */
114 /* that uses the wrong byte order for the `version' field */
115 if ( ( (FT_ULong)version & 0xFFFF0000UL ) != 0x00020000UL &&
116 ( (FT_ULong)version & 0x0000FFFFUL ) != 0x00000200UL &&
117 ( (FT_ULong)version & 0xFFFF0000UL ) != 0x00030000UL &&
118 ( (FT_ULong)version & 0x0000FFFFUL ) != 0x00000300UL )
119 {
120 error = FT_THROW( Unknown_File_Format );
121 goto Exit;
122 }
123
124 if ( num_strikes >= 0x10000UL )
125 {
126 error = FT_THROW( Invalid_File_Format );
127 goto Exit;
128 }
129
130 /*
131 * Count the number of strikes available in the table. We are a bit
132 * paranoid there and don't trust the data.
133 */
134 count = (FT_UInt)num_strikes;
135 if ( 8 + 48UL * count > table_size )
136 count = (FT_UInt)( ( table_size - 8 ) / 48 );
137
138 face->sbit_num_strikes = count;
139 }
140 break;
141
142 case TT_SBIT_TABLE_TYPE_SBIX:
143 {
144 FT_UShort version;
145 FT_UShort flags;
146 FT_ULong num_strikes;
147 FT_UInt count;
148
149
150 if ( FT_FRAME_ENTER( 8 ) )
151 goto Exit;
152
153 version = FT_GET_USHORT();
154 flags = FT_GET_USHORT();
155 num_strikes = FT_GET_ULONG();
156
157 FT_FRAME_EXIT();
158
159 if ( version < 1 )
160 {
161 error = FT_THROW( Unknown_File_Format );
162 goto Exit;
163 }
164
165 /* Bit 0 must always be `1'. */
166 /* Bit 1 controls the overlay of bitmaps with outlines. */
167 /* All other bits should be zero. */
168 if ( !( flags == 1 || flags == 3 ) ||
169 num_strikes >= 0x10000UL )
170 {
171 error = FT_THROW( Invalid_File_Format );
172 goto Exit;
173 }
174
175 if ( flags == 3 )
176 face->root.face_flags |= FT_FACE_FLAG_SBIX_OVERLAY;
177
178 /*
179 * Count the number of strikes available in the table. We are a bit
180 * paranoid there and don't trust the data.
181 */
182 count = (FT_UInt)num_strikes;
183 if ( 8 + 4UL * count > table_size )
184 count = (FT_UInt)( ( table_size - 8 ) / 4 );
185
186 if ( FT_STREAM_SEEK( FT_STREAM_POS() - 8 ) )
187 goto Exit;
188
189 face->sbit_table_size = 8 + count * 4;
190 if ( FT_FRAME_EXTRACT( face->sbit_table_size, face->sbit_table ) )
191 goto Exit;
192
193 face->sbit_num_strikes = count;
194 }
195 break;
196
197 default:
198 /* we ignore unknown table formats */
199 error = FT_THROW( Unknown_File_Format );
200 break;
201 }
202
203 if ( !error )
204 FT_TRACE3(( "tt_face_load_sbit_strikes: found %u strikes\n",
205 face->sbit_num_strikes ));
206
207 face->ebdt_start = 0;
208 face->ebdt_size = 0;
209
210 if ( face->sbit_table_type == TT_SBIT_TABLE_TYPE_SBIX )
211 {
212 /* the `sbix' table is self-contained; */
213 /* it has no associated data table */
214 face->ebdt_start = table_start;
215 face->ebdt_size = table_size;
216 }
217 else if ( face->sbit_table_type != TT_SBIT_TABLE_TYPE_NONE )
218 {
219 FT_ULong ebdt_size;
220
221
222 error = face->goto_table( face, TTAG_CBDT, stream, &ebdt_size );
223 if ( error )
224 error = face->goto_table( face, TTAG_EBDT, stream, &ebdt_size );
225 if ( error )
226 error = face->goto_table( face, TTAG_bdat, stream, &ebdt_size );
227
228 if ( !error )
229 {
230 face->ebdt_start = FT_STREAM_POS();
231 face->ebdt_size = ebdt_size;
232 }
233 }
234
235 if ( !face->ebdt_size )
236 {
237 FT_TRACE2(( "tt_face_load_sbit_strikes:"
238 " no embedded bitmap data table found;\n" ));
239 FT_TRACE2(( " "
240 " resetting number of strikes to zero\n" ));
241 face->sbit_num_strikes = 0;
242 }
243
244 return FT_Err_Ok;
245
246 Exit:
247 if ( error )
248 {
249 if ( face->sbit_table )
250 FT_FRAME_RELEASE( face->sbit_table );
251 face->sbit_table_size = 0;
252 face->sbit_table_type = TT_SBIT_TABLE_TYPE_NONE;
253 }
254
255 return error;
256 }
257
258
259 FT_LOCAL_DEF( void )
260 tt_face_free_sbit( TT_Face face )
261 {
262 FT_Stream stream = face->root.stream;
263
264
265 FT_FRAME_RELEASE( face->sbit_table );
266 face->sbit_table_size = 0;
267 face->sbit_table_type = TT_SBIT_TABLE_TYPE_NONE;
268 face->sbit_num_strikes = 0;
269 }
270
271
272 FT_LOCAL_DEF( FT_Error )
273 tt_face_set_sbit_strike( TT_Face face,
274 FT_Size_Request req,
275 FT_ULong* astrike_index )
276 {
277 return FT_Match_Size( (FT_Face)face, req, 0, astrike_index );
278 }
279
280
281 FT_LOCAL_DEF( FT_Error )
282 tt_face_load_strike_metrics( TT_Face face,
283 FT_ULong strike_index,
284 FT_Size_Metrics* metrics )
285 {
286 /* we have to test for the existence of `sbit_strike_map' */
287 /* because the function gets also used at the very beginning */
288 /* to construct `sbit_strike_map' itself */
289 if ( face->sbit_strike_map )
290 {
291 if ( strike_index >= (FT_ULong)face->root.num_fixed_sizes )
292 return FT_THROW( Invalid_Argument );
293
294 /* map to real index */
295 strike_index = face->sbit_strike_map[strike_index];
296 }
297 else
298 {
299 if ( strike_index >= (FT_ULong)face->sbit_num_strikes )
300 return FT_THROW( Invalid_Argument );
301 }
302
303 switch ( (FT_UInt)face->sbit_table_type )
304 {
305 case TT_SBIT_TABLE_TYPE_EBLC:
306 case TT_SBIT_TABLE_TYPE_CBLC:
307 {
308 FT_Byte* strike;
309 FT_Char max_before_bl;
310 FT_Char min_after_bl;
311
312
313 strike = face->sbit_table + 8 + strike_index * 48;
314
315 metrics->x_ppem = (FT_UShort)strike[44];
316 metrics->y_ppem = (FT_UShort)strike[45];
317
318 metrics->ascender = (FT_Char)strike[16] * 64; /* hori.ascender */
319 metrics->descender = (FT_Char)strike[17] * 64; /* hori.descender */
320
321 /* Due to fuzzy wording in the EBLC documentation, we find both */
322 /* positive and negative values for `descender'. Additionally, */
323 /* many fonts have both `ascender' and `descender' set to zero */
324 /* (which is definitely wrong). MS Windows simply ignores all */
325 /* those values... For these reasons we apply some heuristics */
326 /* to get a reasonable, non-zero value for the height. */
327
328 max_before_bl = (FT_Char)strike[24];
329 min_after_bl = (FT_Char)strike[25];
330
331 if ( metrics->descender > 0 )
332 {
333 /* compare sign of descender with `min_after_bl' */
334 if ( min_after_bl < 0 )
335 metrics->descender = -metrics->descender;
336 }
337
338 else if ( metrics->descender == 0 )
339 {
340 if ( metrics->ascender == 0 )
341 {
342 FT_TRACE2(( "tt_face_load_strike_metrics:"
343 " sanitizing invalid ascender and descender\n" ));
344 FT_TRACE2(( " "
345 " values for strike %ld (%dppem, %dppem)\n",
346 strike_index,
347 metrics->x_ppem, metrics->y_ppem ));
348
349 /* sanitize buggy ascender and descender values */
350 if ( max_before_bl || min_after_bl )
351 {
352 metrics->ascender = max_before_bl * 64;
353 metrics->descender = min_after_bl * 64;
354 }
355 else
356 {
357 metrics->ascender = metrics->y_ppem * 64;
358 metrics->descender = 0;
359 }
360 }
361 }
362
363#if 0
364 else
365 ; /* if we have a negative descender, simply use it */
366#endif
367
368 metrics->height = metrics->ascender - metrics->descender;
369 if ( metrics->height == 0 )
370 {
371 FT_TRACE2(( "tt_face_load_strike_metrics:"
372 " sanitizing invalid height value\n" ));
373 FT_TRACE2(( " "
374 " for strike (%d, %d)\n",
375 metrics->x_ppem, metrics->y_ppem ));
376 metrics->height = metrics->y_ppem * 64;
377 metrics->descender = metrics->ascender - metrics->height;
378 }
379
380 /* Is this correct? */
381 metrics->max_advance = ( (FT_Char)strike[22] + /* min_origin_SB */
382 strike[18] + /* max_width */
383 (FT_Char)strike[23] /* min_advance_SB */
384 ) * 64;
385
386 /* set the scale values (in 16.16 units) so advances */
387 /* from the hmtx and vmtx table are scaled correctly */
388 metrics->x_scale = FT_DivFix( metrics->x_ppem * 64,
389 face->header.Units_Per_EM );
390 metrics->y_scale = FT_DivFix( metrics->y_ppem * 64,
391 face->header.Units_Per_EM );
392
393 return FT_Err_Ok;
394 }
395
396 case TT_SBIT_TABLE_TYPE_SBIX:
397 {
398 FT_Stream stream = face->root.stream;
399 FT_UInt offset;
400 FT_UShort ppem, resolution;
401 TT_HoriHeader *hori;
402 FT_Fixed scale;
403
404 FT_Error error;
405 FT_Byte* p;
406
407
408 p = face->sbit_table + 8 + 4 * strike_index;
409 offset = FT_NEXT_ULONG( p );
410
411 if ( offset + 4 > face->ebdt_size )
412 return FT_THROW( Invalid_File_Format );
413
414 if ( FT_STREAM_SEEK( face->ebdt_start + offset ) ||
415 FT_FRAME_ENTER( 4 ) )
416 return error;
417
418 ppem = FT_GET_USHORT();
419 resolution = FT_GET_USHORT();
420
421 FT_UNUSED( resolution ); /* What to do with this? */
422
423 FT_FRAME_EXIT();
424
425 metrics->x_ppem = ppem;
426 metrics->y_ppem = ppem;
427
428 scale = FT_DivFix( ppem * 64, face->header.Units_Per_EM );
429 hori = &face->horizontal;
430
431 metrics->ascender = FT_MulFix( hori->Ascender, scale );
432 metrics->descender = FT_MulFix( hori->Descender, scale );
433 metrics->height =
434 FT_MulFix( hori->Ascender - hori->Descender + hori->Line_Gap,
435 scale );
436 metrics->max_advance = FT_MulFix( hori->advance_Width_Max, scale );
437
438 /* set the scale values (in 16.16 units) so advances */
439 /* from the hmtx and vmtx table are scaled correctly */
440 metrics->x_scale = scale;
441 metrics->y_scale = scale;
442
443 return error;
444 }
445
446 default:
447 return FT_THROW( Unknown_File_Format );
448 }
449 }
450
451
452 typedef struct TT_SBitDecoderRec_
453 {
454 TT_Face face;
455 FT_Stream stream;
456 FT_Bitmap* bitmap;
457 TT_SBit_Metrics metrics;
458 FT_Bool metrics_loaded;
459 FT_Bool bitmap_allocated;
460 FT_Byte bit_depth;
461
462 FT_ULong ebdt_start;
463 FT_ULong ebdt_size;
464
465 FT_ULong strike_index_array;
466 FT_ULong strike_index_count;
467 FT_Byte* eblc_base;
468 FT_Byte* eblc_limit;
469
470 } TT_SBitDecoderRec, *TT_SBitDecoder;
471
472
473 static FT_Error
474 tt_sbit_decoder_init( TT_SBitDecoder decoder,
475 TT_Face face,
476 FT_ULong strike_index,
477 TT_SBit_MetricsRec* metrics )
478 {
479 FT_Error error = FT_ERR( Table_Missing );
480 FT_Stream stream = face->root.stream;
481
482
483 strike_index = face->sbit_strike_map[strike_index];
484
485 if ( !face->ebdt_size )
486 goto Exit;
487 if ( FT_STREAM_SEEK( face->ebdt_start ) )
488 goto Exit;
489
490 decoder->face = face;
491 decoder->stream = stream;
492 decoder->bitmap = &face->root.glyph->bitmap;
493 decoder->metrics = metrics;
494
495 decoder->metrics_loaded = 0;
496 decoder->bitmap_allocated = 0;
497
498 decoder->ebdt_start = face->ebdt_start;
499 decoder->ebdt_size = face->ebdt_size;
500
501 decoder->eblc_base = face->sbit_table;
502 decoder->eblc_limit = face->sbit_table + face->sbit_table_size;
503
504 /* now find the strike corresponding to the index */
505 {
506 FT_Byte* p;
507
508
509 if ( 8 + 48 * strike_index + 3 * 4 + 34 + 1 > face->sbit_table_size )
510 {
511 error = FT_THROW( Invalid_File_Format );
512 goto Exit;
513 }
514
515 p = decoder->eblc_base + 8 + 48 * strike_index;
516
517 decoder->strike_index_array = FT_NEXT_ULONG( p );
518 p += 4;
519 decoder->strike_index_count = FT_NEXT_ULONG( p );
520 p += 34;
521 decoder->bit_depth = *p;
522
523 /* decoder->strike_index_array + */
524 /* 8 * decoder->strike_index_count > face->sbit_table_size ? */
525 if ( decoder->strike_index_array > face->sbit_table_size ||
526 decoder->strike_index_count >
527 ( face->sbit_table_size - decoder->strike_index_array ) / 8 )
528 error = FT_THROW( Invalid_File_Format );
529 }
530
531 Exit:
532 return error;
533 }
534
535
536 static void
537 tt_sbit_decoder_done( TT_SBitDecoder decoder )
538 {
539 FT_UNUSED( decoder );
540 }
541
542
543 static FT_Error
544 tt_sbit_decoder_alloc_bitmap( TT_SBitDecoder decoder,
545 FT_Bool metrics_only )
546 {
547 FT_Error error = FT_Err_Ok;
548 FT_UInt width, height;
549 FT_Bitmap* map = decoder->bitmap;
550 FT_ULong size;
551
552
553 if ( !decoder->metrics_loaded )
554 {
555 error = FT_THROW( Invalid_Argument );
556 goto Exit;
557 }
558
559 width = decoder->metrics->width;
560 height = decoder->metrics->height;
561
562 map->width = width;
563 map->rows = height;
564
565 switch ( decoder->bit_depth )
566 {
567 case 1:
568 map->pixel_mode = FT_PIXEL_MODE_MONO;
569 map->pitch = (int)( ( map->width + 7 ) >> 3 );
570 map->num_grays = 2;
571 break;
572
573 case 2:
574 map->pixel_mode = FT_PIXEL_MODE_GRAY2;
575 map->pitch = (int)( ( map->width + 3 ) >> 2 );
576 map->num_grays = 4;
577 break;
578
579 case 4:
580 map->pixel_mode = FT_PIXEL_MODE_GRAY4;
581 map->pitch = (int)( ( map->width + 1 ) >> 1 );
582 map->num_grays = 16;
583 break;
584
585 case 8:
586 map->pixel_mode = FT_PIXEL_MODE_GRAY;
587 map->pitch = (int)( map->width );
588 map->num_grays = 256;
589 break;
590
591 case 32:
592 map->pixel_mode = FT_PIXEL_MODE_BGRA;
593 map->pitch = (int)( map->width * 4 );
594 map->num_grays = 256;
595 break;
596
597 default:
598 error = FT_THROW( Invalid_File_Format );
599 goto Exit;
600 }
601
602 size = map->rows * (FT_ULong)map->pitch;
603
604 /* check that there is no empty image */
605 if ( size == 0 )
606 goto Exit; /* exit successfully! */
607
608 if ( metrics_only )
609 goto Exit; /* only metrics are requested */
610
611 error = ft_glyphslot_alloc_bitmap( decoder->face->root.glyph, size );
612 if ( error )
613 goto Exit;
614
615 decoder->bitmap_allocated = 1;
616
617 Exit:
618 return error;
619 }
620
621
622 static FT_Error
623 tt_sbit_decoder_load_metrics( TT_SBitDecoder decoder,
624 FT_Byte* *pp,
625 FT_Byte* limit,
626 FT_Bool big )
627 {
628 FT_Byte* p = *pp;
629 TT_SBit_Metrics metrics = decoder->metrics;
630
631
632 if ( p + 5 > limit )
633 goto Fail;
634
635 metrics->height = p[0];
636 metrics->width = p[1];
637 metrics->horiBearingX = (FT_Char)p[2];
638 metrics->horiBearingY = (FT_Char)p[3];
639 metrics->horiAdvance = p[4];
640
641 p += 5;
642 if ( big )
643 {
644 if ( p + 3 > limit )
645 goto Fail;
646
647 metrics->vertBearingX = (FT_Char)p[0];
648 metrics->vertBearingY = (FT_Char)p[1];
649 metrics->vertAdvance = p[2];
650
651 p += 3;
652 }
653 else
654 {
655 /* avoid uninitialized data in case there is no vertical info -- */
656 metrics->vertBearingX = 0;
657 metrics->vertBearingY = 0;
658 metrics->vertAdvance = 0;
659 }
660
661 decoder->metrics_loaded = 1;
662 *pp = p;
663 return FT_Err_Ok;
664
665 Fail:
666 FT_TRACE1(( "tt_sbit_decoder_load_metrics: broken table\n" ));
667 return FT_THROW( Invalid_Argument );
668 }
669
670
671 /* forward declaration */
672 static FT_Error
673 tt_sbit_decoder_load_image( TT_SBitDecoder decoder,
674 FT_UInt glyph_index,
675 FT_Int x_pos,
676 FT_Int y_pos,
677 FT_UInt recurse_count,
678 FT_Bool metrics_only );
679
680 typedef FT_Error (*TT_SBitDecoder_LoadFunc)(
681 TT_SBitDecoder decoder,
682 FT_Byte* p,
683 FT_Byte* plimit,
684 FT_Int x_pos,
685 FT_Int y_pos,
686 FT_UInt recurse_count );
687
688
689 static FT_Error
690 tt_sbit_decoder_load_byte_aligned( TT_SBitDecoder decoder,
691 FT_Byte* p,
692 FT_Byte* limit,
693 FT_Int x_pos,
694 FT_Int y_pos,
695 FT_UInt recurse_count )
696 {
697 FT_Error error = FT_Err_Ok;
698 FT_Byte* line;
699 FT_Int pitch, width, height, line_bits, h;
700 FT_UInt bit_height, bit_width;
701 FT_Bitmap* bitmap;
702
703 FT_UNUSED( recurse_count );
704
705
706 /* check that we can write the glyph into the bitmap */
707 bitmap = decoder->bitmap;
708 bit_width = bitmap->width;
709 bit_height = bitmap->rows;
710 pitch = bitmap->pitch;
711 line = bitmap->buffer;
712
713 if ( !line )
714 goto Exit;
715
716 width = decoder->metrics->width;
717 height = decoder->metrics->height;
718
719 line_bits = width * decoder->bit_depth;
720
721 if ( x_pos < 0 || (FT_UInt)( x_pos + width ) > bit_width ||
722 y_pos < 0 || (FT_UInt)( y_pos + height ) > bit_height )
723 {
724 FT_TRACE1(( "tt_sbit_decoder_load_byte_aligned:"
725 " invalid bitmap dimensions\n" ));
726 error = FT_THROW( Invalid_File_Format );
727 goto Exit;
728 }
729
730 if ( p + ( ( line_bits + 7 ) >> 3 ) * height > limit )
731 {
732 FT_TRACE1(( "tt_sbit_decoder_load_byte_aligned: broken bitmap\n" ));
733 error = FT_THROW( Invalid_File_Format );
734 goto Exit;
735 }
736
737 /* now do the blit */
738 line += y_pos * pitch + ( x_pos >> 3 );
739 x_pos &= 7;
740
741 if ( x_pos == 0 ) /* the easy one */
742 {
743 for ( h = height; h > 0; h--, line += pitch )
744 {
745 FT_Byte* pwrite = line;
746 FT_Int w;
747
748
749 for ( w = line_bits; w >= 8; w -= 8 )
750 {
751 pwrite[0] = (FT_Byte)( pwrite[0] | *p++ );
752 pwrite += 1;
753 }
754
755 if ( w > 0 )
756 pwrite[0] = (FT_Byte)( pwrite[0] | ( *p++ & ( 0xFF00U >> w ) ) );
757 }
758 }
759 else /* x_pos > 0 */
760 {
761 for ( h = height; h > 0; h--, line += pitch )
762 {
763 FT_Byte* pwrite = line;
764 FT_Int w;
765 FT_UInt wval = 0;
766
767
768 for ( w = line_bits; w >= 8; w -= 8 )
769 {
770 wval = (FT_UInt)( wval | *p++ );
771 pwrite[0] = (FT_Byte)( pwrite[0] | ( wval >> x_pos ) );
772 pwrite += 1;
773 wval <<= 8;
774 }
775
776 if ( w > 0 )
777 wval = (FT_UInt)( wval | ( *p++ & ( 0xFF00U >> w ) ) );
778
779 /* all bits read and there are `x_pos + w' bits to be written */
780
781 pwrite[0] = (FT_Byte)( pwrite[0] | ( wval >> x_pos ) );
782
783 if ( x_pos + w > 8 )
784 {
785 pwrite++;
786 wval <<= 8;
787 pwrite[0] = (FT_Byte)( pwrite[0] | ( wval >> x_pos ) );
788 }
789 }
790 }
791
792 Exit:
793 if ( !error )
794 FT_TRACE3(( "tt_sbit_decoder_load_byte_aligned: loaded\n" ));
795 return error;
796 }
797
798
799 /*
800 * Load a bit-aligned bitmap (with pointer `p') into a line-aligned bitmap
801 * (with pointer `pwrite'). In the example below, the width is 3 pixel,
802 * and `x_pos' is 1 pixel.
803 *
804 * p p+1
805 * | | |
806 * | 7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 |...
807 * | | |
808 * +-------+ +-------+ +-------+ ...
809 * . . .
810 * . . .
811 * v . .
812 * +-------+ . .
813 * | | .
814 * | 7 6 5 4 3 2 1 0 | .
815 * | | .
816 * pwrite . .
817 * . .
818 * v .
819 * +-------+ .
820 * | |
821 * | 7 6 5 4 3 2 1 0 |
822 * | |
823 * pwrite+1 .
824 * .
825 * v
826 * +-------+
827 * | |
828 * | 7 6 5 4 3 2 1 0 |
829 * | |
830 * pwrite+2
831 *
832 */
833
834 static FT_Error
835 tt_sbit_decoder_load_bit_aligned( TT_SBitDecoder decoder,
836 FT_Byte* p,
837 FT_Byte* limit,
838 FT_Int x_pos,
839 FT_Int y_pos,
840 FT_UInt recurse_count )
841 {
842 FT_Error error = FT_Err_Ok;
843 FT_Byte* line;
844 FT_Int pitch, width, height, line_bits, h, nbits;
845 FT_UInt bit_height, bit_width;
846 FT_Bitmap* bitmap;
847 FT_UShort rval;
848
849 FT_UNUSED( recurse_count );
850
851
852 /* check that we can write the glyph into the bitmap */
853 bitmap = decoder->bitmap;
854 bit_width = bitmap->width;
855 bit_height = bitmap->rows;
856 pitch = bitmap->pitch;
857 line = bitmap->buffer;
858
859 width = decoder->metrics->width;
860 height = decoder->metrics->height;
861
862 line_bits = width * decoder->bit_depth;
863
864 if ( x_pos < 0 || (FT_UInt)( x_pos + width ) > bit_width ||
865 y_pos < 0 || (FT_UInt)( y_pos + height ) > bit_height )
866 {
867 FT_TRACE1(( "tt_sbit_decoder_load_bit_aligned:"
868 " invalid bitmap dimensions\n" ));
869 error = FT_THROW( Invalid_File_Format );
870 goto Exit;
871 }
872
873 if ( p + ( ( line_bits * height + 7 ) >> 3 ) > limit )
874 {
875 FT_TRACE1(( "tt_sbit_decoder_load_bit_aligned: broken bitmap\n" ));
876 error = FT_THROW( Invalid_File_Format );
877 goto Exit;
878 }
879
880 if ( !line_bits || !height )
881 {
882 /* nothing to do */
883 goto Exit;
884 }
885
886 /* now do the blit */
887
888 /* adjust `line' to point to the first byte of the bitmap */
889 line += y_pos * pitch + ( x_pos >> 3 );
890 x_pos &= 7;
891
892 /* the higher byte of `rval' is used as a buffer */
893 rval = 0;
894 nbits = 0;
895
896 for ( h = height; h > 0; h--, line += pitch )
897 {
898 FT_Byte* pwrite = line;
899 FT_Int w = line_bits;
900
901
902 /* handle initial byte (in target bitmap) specially if necessary */
903 if ( x_pos )
904 {
905 w = ( line_bits < 8 - x_pos ) ? line_bits : 8 - x_pos;
906
907 if ( h == height )
908 {
909 rval = *p++;
910 nbits = x_pos;
911 }
912 else if ( nbits < w )
913 {
914 if ( p < limit )
915 rval |= *p++;
916 nbits += 8 - w;
917 }
918 else
919 {
920 rval >>= 8;
921 nbits -= w;
922 }
923
924 *pwrite++ |= ( ( rval >> nbits ) & 0xFF ) &
925 ( ~( 0xFFU << w ) << ( 8 - w - x_pos ) );
926 rval <<= 8;
927
928 w = line_bits - w;
929 }
930
931 /* handle medial bytes */
932 for ( ; w >= 8; w -= 8 )
933 {
934 rval |= *p++;
935 *pwrite++ |= ( rval >> nbits ) & 0xFF;
936
937 rval <<= 8;
938 }
939
940 /* handle final byte if necessary */
941 if ( w > 0 )
942 {
943 if ( nbits < w )
944 {
945 if ( p < limit )
946 rval |= *p++;
947 *pwrite |= ( ( rval >> nbits ) & 0xFF ) & ( 0xFF00U >> w );
948 nbits += 8 - w;
949
950 rval <<= 8;
951 }
952 else
953 {
954 *pwrite |= ( ( rval >> nbits ) & 0xFF ) & ( 0xFF00U >> w );
955 nbits -= w;
956 }
957 }
958 }
959
960 Exit:
961 if ( !error )
962 FT_TRACE3(( "tt_sbit_decoder_load_bit_aligned: loaded\n" ));
963 return error;
964 }
965
966
967 static FT_Error
968 tt_sbit_decoder_load_compound( TT_SBitDecoder decoder,
969 FT_Byte* p,
970 FT_Byte* limit,
971 FT_Int x_pos,
972 FT_Int y_pos,
973 FT_UInt recurse_count )
974 {
975 FT_Error error = FT_Err_Ok;
976 FT_UInt num_components, nn;
977
978 FT_Char horiBearingX = (FT_Char)decoder->metrics->horiBearingX;
979 FT_Char horiBearingY = (FT_Char)decoder->metrics->horiBearingY;
980 FT_Byte horiAdvance = (FT_Byte)decoder->metrics->horiAdvance;
981 FT_Char vertBearingX = (FT_Char)decoder->metrics->vertBearingX;
982 FT_Char vertBearingY = (FT_Char)decoder->metrics->vertBearingY;
983 FT_Byte vertAdvance = (FT_Byte)decoder->metrics->vertAdvance;
984
985
986 if ( p + 2 > limit )
987 goto Fail;
988
989 num_components = FT_NEXT_USHORT( p );
990 if ( p + 4 * num_components > limit )
991 {
992 FT_TRACE1(( "tt_sbit_decoder_load_compound: broken table\n" ));
993 goto Fail;
994 }
995
996 FT_TRACE3(( "tt_sbit_decoder_load_compound: loading %d component%s\n",
997 num_components,
998 num_components == 1 ? "" : "s" ));
999
1000 for ( nn = 0; nn < num_components; nn++ )
1001 {
1002 FT_UInt gindex = FT_NEXT_USHORT( p );
1003 FT_Char dx = FT_NEXT_CHAR( p );
1004 FT_Char dy = FT_NEXT_CHAR( p );
1005
1006
1007 /* NB: a recursive call */
1008 error = tt_sbit_decoder_load_image( decoder,
1009 gindex,
1010 x_pos + dx,
1011 y_pos + dy,
1012 recurse_count + 1,
1013 /* request full bitmap image */
1014 FALSE );
1015 if ( error )
1016 break;
1017 }
1018
1019 FT_TRACE3(( "tt_sbit_decoder_load_compound: done\n" ));
1020
1021 decoder->metrics->horiBearingX = horiBearingX;
1022 decoder->metrics->horiBearingY = horiBearingY;
1023 decoder->metrics->horiAdvance = horiAdvance;
1024 decoder->metrics->vertBearingX = vertBearingX;
1025 decoder->metrics->vertBearingY = vertBearingY;
1026 decoder->metrics->vertAdvance = vertAdvance;
1027 decoder->metrics->width = (FT_Byte)decoder->bitmap->width;
1028 decoder->metrics->height = (FT_Byte)decoder->bitmap->rows;
1029
1030 Exit:
1031 return error;
1032
1033 Fail:
1034 error = FT_THROW( Invalid_File_Format );
1035 goto Exit;
1036 }
1037
1038
1039#ifdef FT_CONFIG_OPTION_USE_PNG
1040
1041 static FT_Error
1042 tt_sbit_decoder_load_png( TT_SBitDecoder decoder,
1043 FT_Byte* p,
1044 FT_Byte* limit,
1045 FT_Int x_pos,
1046 FT_Int y_pos,
1047 FT_UInt recurse_count )
1048 {
1049 FT_Error error = FT_Err_Ok;
1050 FT_ULong png_len;
1051
1052 FT_UNUSED( recurse_count );
1053
1054
1055 if ( limit - p < 4 )
1056 {
1057 FT_TRACE1(( "tt_sbit_decoder_load_png: broken bitmap\n" ));
1058 error = FT_THROW( Invalid_File_Format );
1059 goto Exit;
1060 }
1061
1062 png_len = FT_NEXT_ULONG( p );
1063 if ( (FT_ULong)( limit - p ) < png_len )
1064 {
1065 FT_TRACE1(( "tt_sbit_decoder_load_png: broken bitmap\n" ));
1066 error = FT_THROW( Invalid_File_Format );
1067 goto Exit;
1068 }
1069
1070 error = Load_SBit_Png( decoder->face->root.glyph,
1071 x_pos,
1072 y_pos,
1073 decoder->bit_depth,
1074 decoder->metrics,
1075 decoder->stream->memory,
1076 p,
1077 png_len,
1078 FALSE,
1079 FALSE );
1080
1081 Exit:
1082 if ( !error )
1083 FT_TRACE3(( "tt_sbit_decoder_load_png: loaded\n" ));
1084 return error;
1085 }
1086
1087#endif /* FT_CONFIG_OPTION_USE_PNG */
1088
1089
1090 static FT_Error
1091 tt_sbit_decoder_load_bitmap( TT_SBitDecoder decoder,
1092 FT_UInt glyph_format,
1093 FT_ULong glyph_start,
1094 FT_ULong glyph_size,
1095 FT_Int x_pos,
1096 FT_Int y_pos,
1097 FT_UInt recurse_count,
1098 FT_Bool metrics_only )
1099 {
1100 FT_Error error;
1101 FT_Stream stream = decoder->stream;
1102 FT_Byte* p;
1103 FT_Byte* p_limit;
1104 FT_Byte* data;
1105
1106
1107 /* seek into the EBDT table now */
1108 if ( !glyph_size ||
1109 glyph_start + glyph_size > decoder->ebdt_size )
1110 {
1111 error = FT_THROW( Invalid_Argument );
1112 goto Exit;
1113 }
1114
1115 if ( FT_STREAM_SEEK( decoder->ebdt_start + glyph_start ) ||
1116 FT_FRAME_EXTRACT( glyph_size, data ) )
1117 goto Exit;
1118
1119 p = data;
1120 p_limit = p + glyph_size;
1121
1122 /* read the data, depending on the glyph format */
1123 switch ( glyph_format )
1124 {
1125 case 1:
1126 case 2:
1127 case 8:
1128 case 17:
1129 error = tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 0 );
1130 break;
1131
1132 case 6:
1133 case 7:
1134 case 9:
1135 case 18:
1136 error = tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 );
1137 break;
1138
1139 default:
1140 error = FT_Err_Ok;
1141 }
1142
1143 if ( error )
1144 goto Fail;
1145
1146 {
1147 TT_SBitDecoder_LoadFunc loader;
1148
1149
1150 switch ( glyph_format )
1151 {
1152 case 1:
1153 case 6:
1154 loader = tt_sbit_decoder_load_byte_aligned;
1155 break;
1156
1157 case 2:
1158 case 7:
1159 {
1160 /* Don't trust `glyph_format'. For example, Apple's main Korean */
1161 /* system font, `AppleMyungJo.ttf' (version 7.0d2e6), uses glyph */
1162 /* format 7, but the data is format 6. We check whether we have */
1163 /* an excessive number of bytes in the image: If it is equal to */
1164 /* the value for a byte-aligned glyph, use the other loading */
1165 /* routine. */
1166 /* */
1167 /* Note that for some (width,height) combinations, where the */
1168 /* width is not a multiple of 8, the sizes for bit- and */
1169 /* byte-aligned data are equal, for example (7,7) or (15,6). We */
1170 /* then prefer what `glyph_format' specifies. */
1171
1172 FT_UInt width = decoder->metrics->width;
1173 FT_UInt height = decoder->metrics->height;
1174
1175 FT_UInt bit_size = ( width * height + 7 ) >> 3;
1176 FT_UInt byte_size = height * ( ( width + 7 ) >> 3 );
1177
1178
1179 if ( bit_size < byte_size &&
1180 byte_size == (FT_UInt)( p_limit - p ) )
1181 loader = tt_sbit_decoder_load_byte_aligned;
1182 else
1183 loader = tt_sbit_decoder_load_bit_aligned;
1184 }
1185 break;
1186
1187 case 5:
1188 loader = tt_sbit_decoder_load_bit_aligned;
1189 break;
1190
1191 case 8:
1192 if ( p + 1 > p_limit )
1193 goto Fail;
1194
1195 p += 1; /* skip padding */
1196 FALL_THROUGH;
1197
1198 case 9:
1199 loader = tt_sbit_decoder_load_compound;
1200 break;
1201
1202 case 17: /* small metrics, PNG image data */
1203 case 18: /* big metrics, PNG image data */
1204 case 19: /* metrics in EBLC, PNG image data */
1205#ifdef FT_CONFIG_OPTION_USE_PNG
1206 loader = tt_sbit_decoder_load_png;
1207 break;
1208#else
1209 error = FT_THROW( Unimplemented_Feature );
1210 goto Fail;
1211#endif /* FT_CONFIG_OPTION_USE_PNG */
1212
1213 default:
1214 error = FT_THROW( Invalid_Table );
1215 goto Fail;
1216 }
1217
1218 if ( !decoder->bitmap_allocated )
1219 {
1220 error = tt_sbit_decoder_alloc_bitmap( decoder, metrics_only );
1221
1222 if ( error )
1223 goto Fail;
1224 }
1225
1226 if ( metrics_only )
1227 goto Fail; /* this is not an error */
1228
1229 error = loader( decoder, p, p_limit, x_pos, y_pos, recurse_count );
1230 }
1231
1232 Fail:
1233 FT_FRAME_RELEASE( data );
1234
1235 Exit:
1236 return error;
1237 }
1238
1239
1240 static FT_Error
1241 tt_sbit_decoder_load_image( TT_SBitDecoder decoder,
1242 FT_UInt glyph_index,
1243 FT_Int x_pos,
1244 FT_Int y_pos,
1245 FT_UInt recurse_count,
1246 FT_Bool metrics_only )
1247 {
1248 FT_Byte* p = decoder->eblc_base + decoder->strike_index_array;
1249 FT_Byte* p_limit = decoder->eblc_limit;
1250 FT_ULong num_ranges = decoder->strike_index_count;
1251 FT_UInt start, end, index_format, image_format;
1252 FT_ULong image_start = 0, image_end = 0, image_offset;
1253
1254
1255 /* arbitrary recursion limit */
1256 if ( recurse_count > 100 )
1257 {
1258 FT_TRACE4(( "tt_sbit_decoder_load_image:"
1259 " recursion depth exceeded\n" ));
1260 goto Failure;
1261 }
1262
1263
1264 /* First, we find the correct strike range that applies to this */
1265 /* glyph index. */
1266 for ( ; num_ranges > 0; num_ranges-- )
1267 {
1268 start = FT_NEXT_USHORT( p );
1269 end = FT_NEXT_USHORT( p );
1270
1271 if ( glyph_index >= start && glyph_index <= end )
1272 goto FoundRange;
1273
1274 p += 4; /* ignore index offset */
1275 }
1276 goto NoBitmap;
1277
1278 FoundRange:
1279 image_offset = FT_NEXT_ULONG( p );
1280
1281 /* overflow check */
1282 p = decoder->eblc_base + decoder->strike_index_array;
1283 if ( image_offset > (FT_ULong)( p_limit - p ) )
1284 goto Failure;
1285
1286 p += image_offset;
1287 if ( p + 8 > p_limit )
1288 goto NoBitmap;
1289
1290 /* now find the glyph's location and extend within the ebdt table */
1291 index_format = FT_NEXT_USHORT( p );
1292 image_format = FT_NEXT_USHORT( p );
1293 image_offset = FT_NEXT_ULONG ( p );
1294
1295 switch ( index_format )
1296 {
1297 case 1: /* 4-byte offsets relative to `image_offset' */
1298 p += 4 * ( glyph_index - start );
1299 if ( p + 8 > p_limit )
1300 goto NoBitmap;
1301
1302 image_start = FT_NEXT_ULONG( p );
1303 image_end = FT_NEXT_ULONG( p );
1304
1305 if ( image_start == image_end ) /* missing glyph */
1306 goto NoBitmap;
1307 break;
1308
1309 case 2: /* big metrics, constant image size */
1310 {
1311 FT_ULong image_size;
1312
1313
1314 if ( p + 12 > p_limit )
1315 goto NoBitmap;
1316
1317 image_size = FT_NEXT_ULONG( p );
1318
1319 if ( tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 ) )
1320 goto NoBitmap;
1321
1322 image_start = image_size * ( glyph_index - start );
1323 image_end = image_start + image_size;
1324 }
1325 break;
1326
1327 case 3: /* 2-byte offsets relative to 'image_offset' */
1328 p += 2 * ( glyph_index - start );
1329 if ( p + 4 > p_limit )
1330 goto NoBitmap;
1331
1332 image_start = FT_NEXT_USHORT( p );
1333 image_end = FT_NEXT_USHORT( p );
1334
1335 if ( image_start == image_end ) /* missing glyph */
1336 goto NoBitmap;
1337 break;
1338
1339 case 4: /* sparse glyph array with (glyph,offset) pairs */
1340 {
1341 FT_ULong mm, num_glyphs;
1342
1343
1344 if ( p + 4 > p_limit )
1345 goto NoBitmap;
1346
1347 num_glyphs = FT_NEXT_ULONG( p );
1348
1349 /* overflow check for p + ( num_glyphs + 1 ) * 4 */
1350 if ( p + 4 > p_limit ||
1351 num_glyphs > (FT_ULong)( ( ( p_limit - p ) >> 2 ) - 1 ) )
1352 goto NoBitmap;
1353
1354 for ( mm = 0; mm < num_glyphs; mm++ )
1355 {
1356 FT_UInt gindex = FT_NEXT_USHORT( p );
1357
1358
1359 if ( gindex == glyph_index )
1360 {
1361 image_start = FT_NEXT_USHORT( p );
1362 p += 2;
1363 image_end = FT_PEEK_USHORT( p );
1364 break;
1365 }
1366 p += 2;
1367 }
1368
1369 if ( mm >= num_glyphs )
1370 goto NoBitmap;
1371 }
1372 break;
1373
1374 case 5: /* constant metrics with sparse glyph codes */
1375 case 19:
1376 {
1377 FT_ULong image_size, mm, num_glyphs;
1378
1379
1380 if ( p + 16 > p_limit )
1381 goto NoBitmap;
1382
1383 image_size = FT_NEXT_ULONG( p );
1384
1385 if ( tt_sbit_decoder_load_metrics( decoder, &p, p_limit, 1 ) )
1386 goto NoBitmap;
1387
1388 num_glyphs = FT_NEXT_ULONG( p );
1389
1390 /* overflow check for p + 2 * num_glyphs */
1391 if ( num_glyphs > (FT_ULong)( ( p_limit - p ) >> 1 ) )
1392 goto NoBitmap;
1393
1394 for ( mm = 0; mm < num_glyphs; mm++ )
1395 {
1396 FT_UInt gindex = FT_NEXT_USHORT( p );
1397
1398
1399 if ( gindex == glyph_index )
1400 break;
1401 }
1402
1403 if ( mm >= num_glyphs )
1404 goto NoBitmap;
1405
1406 image_start = image_size * mm;
1407 image_end = image_start + image_size;
1408 }
1409 break;
1410
1411 default:
1412 goto NoBitmap;
1413 }
1414
1415 if ( image_start > image_end )
1416 goto NoBitmap;
1417
1418 image_end -= image_start;
1419 image_start = image_offset + image_start;
1420
1421 FT_TRACE3(( "tt_sbit_decoder_load_image:"
1422 " found sbit (format %d) for glyph index %d\n",
1423 image_format, glyph_index ));
1424
1425 return tt_sbit_decoder_load_bitmap( decoder,
1426 image_format,
1427 image_start,
1428 image_end,
1429 x_pos,
1430 y_pos,
1431 recurse_count,
1432 metrics_only );
1433
1434 Failure:
1435 return FT_THROW( Invalid_Table );
1436
1437 NoBitmap:
1438 if ( recurse_count )
1439 {
1440 FT_TRACE4(( "tt_sbit_decoder_load_image:"
1441 " missing subglyph sbit with glyph index %d\n",
1442 glyph_index ));
1443 return FT_THROW( Invalid_Composite );
1444 }
1445
1446 FT_TRACE4(( "tt_sbit_decoder_load_image:"
1447 " no sbit found for glyph index %d\n", glyph_index ));
1448 return FT_THROW( Missing_Bitmap );
1449 }
1450
1451
1452 static FT_Error
1453 tt_face_load_sbix_image( TT_Face face,
1454 FT_ULong strike_index,
1455 FT_UInt glyph_index,
1456 FT_Stream stream,
1457 FT_Bitmap *map,
1458 TT_SBit_MetricsRec *metrics,
1459 FT_Bool metrics_only )
1460 {
1461 FT_UInt strike_offset, glyph_start, glyph_end;
1462 FT_Int originOffsetX, originOffsetY;
1463 FT_Tag graphicType;
1464 FT_Int recurse_depth = 0;
1465
1466 FT_Error error;
1467 FT_Byte* p;
1468
1469 FT_UNUSED( map );
1470#ifndef FT_CONFIG_OPTION_USE_PNG
1471 FT_UNUSED( metrics_only );
1472#endif
1473
1474
1475 strike_index = face->sbit_strike_map[strike_index];
1476
1477 metrics->width = 0;
1478 metrics->height = 0;
1479
1480 p = face->sbit_table + 8 + 4 * strike_index;
1481 strike_offset = FT_NEXT_ULONG( p );
1482
1483 retry:
1484 if ( glyph_index > (FT_UInt)face->root.num_glyphs )
1485 return FT_THROW( Invalid_Argument );
1486
1487 if ( strike_offset >= face->ebdt_size ||
1488 face->ebdt_size - strike_offset < 4 + glyph_index * 4 + 8 )
1489 return FT_THROW( Invalid_File_Format );
1490
1491 if ( FT_STREAM_SEEK( face->ebdt_start +
1492 strike_offset + 4 +
1493 glyph_index * 4 ) ||
1494 FT_FRAME_ENTER( 8 ) )
1495 return error;
1496
1497 glyph_start = FT_GET_ULONG();
1498 glyph_end = FT_GET_ULONG();
1499
1500 FT_FRAME_EXIT();
1501
1502 if ( glyph_start == glyph_end )
1503 return FT_THROW( Missing_Bitmap );
1504 if ( glyph_start > glyph_end ||
1505 glyph_end - glyph_start < 8 ||
1506 face->ebdt_size - strike_offset < glyph_end )
1507 return FT_THROW( Invalid_File_Format );
1508
1509 if ( FT_STREAM_SEEK( face->ebdt_start + strike_offset + glyph_start ) ||
1510 FT_FRAME_ENTER( glyph_end - glyph_start ) )
1511 return error;
1512
1513 originOffsetX = FT_GET_SHORT();
1514 originOffsetY = FT_GET_SHORT();
1515
1516 graphicType = FT_GET_TAG4();
1517
1518 switch ( graphicType )
1519 {
1520 case FT_MAKE_TAG( 'd', 'u', 'p', 'e' ):
1521 if ( recurse_depth < 4 )
1522 {
1523 glyph_index = FT_GET_USHORT();
1524 FT_FRAME_EXIT();
1525 recurse_depth++;
1526 goto retry;
1527 }
1528 error = FT_THROW( Invalid_File_Format );
1529 break;
1530
1531 case FT_MAKE_TAG( 'p', 'n', 'g', ' ' ):
1532#ifdef FT_CONFIG_OPTION_USE_PNG
1533 error = Load_SBit_Png( face->root.glyph,
1534 0,
1535 0,
1536 32,
1537 metrics,
1538 stream->memory,
1539 stream->cursor,
1540 glyph_end - glyph_start - 8,
1541 TRUE,
1542 metrics_only );
1543#else
1544 error = FT_THROW( Unimplemented_Feature );
1545#endif
1546 break;
1547
1548 case FT_MAKE_TAG( 'j', 'p', 'g', ' ' ):
1549 case FT_MAKE_TAG( 't', 'i', 'f', 'f' ):
1550 case FT_MAKE_TAG( 'r', 'g', 'b', 'l' ): /* used on iOS 7.1 */
1551 error = FT_THROW( Unknown_File_Format );
1552 break;
1553
1554 default:
1555 error = FT_THROW( Unimplemented_Feature );
1556 break;
1557 }
1558
1559 FT_FRAME_EXIT();
1560
1561 if ( !error )
1562 {
1563 FT_Short abearing; /* not used here */
1564 FT_UShort aadvance;
1565
1566
1567 tt_face_get_metrics( face, FALSE, glyph_index, &abearing, &aadvance );
1568
1569 metrics->horiBearingX = (FT_Short)originOffsetX;
1570 metrics->vertBearingX = (FT_Short)originOffsetX;
1571
1572 metrics->horiBearingY = (FT_Short)( originOffsetY + metrics->height );
1573 metrics->vertBearingY = (FT_Short)originOffsetY;
1574
1575 metrics->horiAdvance = (FT_UShort)( aadvance *
1576 face->root.size->metrics.x_ppem /
1577 face->header.Units_Per_EM );
1578
1579 if ( face->vertical_info )
1580 tt_face_get_metrics( face, TRUE, glyph_index, &abearing, &aadvance );
1581 else if ( face->os2.version != 0xFFFFU )
1582 aadvance = (FT_UShort)FT_ABS( face->os2.sTypoAscender -
1583 face->os2.sTypoDescender );
1584 else
1585 aadvance = (FT_UShort)FT_ABS( face->horizontal.Ascender -
1586 face->horizontal.Descender );
1587
1588 metrics->vertAdvance = (FT_UShort)( aadvance *
1589 face->root.size->metrics.x_ppem /
1590 face->header.Units_Per_EM );
1591 }
1592
1593 return error;
1594 }
1595
1596 FT_LOCAL_DEF( FT_Error )
1597 tt_face_load_sbit_image( TT_Face face,
1598 FT_ULong strike_index,
1599 FT_UInt glyph_index,
1600 FT_UInt load_flags,
1601 FT_Stream stream,
1602 FT_Bitmap *map,
1603 TT_SBit_MetricsRec *metrics )
1604 {
1605 FT_Error error = FT_Err_Ok;
1606
1607
1608 switch ( (FT_UInt)face->sbit_table_type )
1609 {
1610 case TT_SBIT_TABLE_TYPE_EBLC:
1611 case TT_SBIT_TABLE_TYPE_CBLC:
1612 {
1613 TT_SBitDecoderRec decoder[1];
1614
1615
1616 error = tt_sbit_decoder_init( decoder, face, strike_index, metrics );
1617 if ( !error )
1618 {
1619 error = tt_sbit_decoder_load_image(
1620 decoder,
1621 glyph_index,
1622 0,
1623 0,
1624 0,
1625 ( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) != 0 );
1626 tt_sbit_decoder_done( decoder );
1627 }
1628 }
1629 break;
1630
1631 case TT_SBIT_TABLE_TYPE_SBIX:
1632 error = tt_face_load_sbix_image(
1633 face,
1634 strike_index,
1635 glyph_index,
1636 stream,
1637 map,
1638 metrics,
1639 ( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) != 0 );
1640 break;
1641
1642 default:
1643 error = FT_THROW( Unknown_File_Format );
1644 break;
1645 }
1646
1647 /* Flatten color bitmaps if color was not requested. */
1648 if ( !error &&
1649 !( load_flags & FT_LOAD_COLOR ) &&
1650 !( load_flags & FT_LOAD_BITMAP_METRICS_ONLY ) &&
1651 map->pixel_mode == FT_PIXEL_MODE_BGRA )
1652 {
1653 FT_Bitmap new_map;
1654 FT_Library library = face->root.glyph->library;
1655
1656
1657 FT_Bitmap_Init( &new_map );
1658
1659 /* Convert to 8bit grayscale. */
1660 error = FT_Bitmap_Convert( library, map, &new_map, 1 );
1661 if ( error )
1662 FT_Bitmap_Done( library, &new_map );
1663 else
1664 {
1665 map->pixel_mode = new_map.pixel_mode;
1666 map->pitch = new_map.pitch;
1667 map->num_grays = new_map.num_grays;
1668
1669 ft_glyphslot_set_bitmap( face->root.glyph, new_map.buffer );
1670 face->root.glyph->internal->flags |= FT_GLYPH_OWN_BITMAP;
1671 }
1672 }
1673
1674 return error;
1675 }
1676
1677#else /* !TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
1678
1679 /* ANSI C doesn't like empty source files */
1680 typedef int tt_sbit_dummy_;
1681
1682#endif /* !TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
1683
1684
1685/* END */
1686