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[FREETYPE]
[reactos.git] / reactos / lib / 3rdparty / freetype / src / sfnt / sfobjs.c
1 /***************************************************************************/
2 /* */
3 /* sfobjs.c */
4 /* */
5 /* SFNT object management (base). */
6 /* */
7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 #include <ft2build.h>
20 #include "sfobjs.h"
21 #include "ttload.h"
22 #include "ttcmap.h"
23 #include "ttkern.h"
24 #include FT_INTERNAL_SFNT_H
25 #include FT_INTERNAL_DEBUG_H
26 #include FT_TRUETYPE_IDS_H
27 #include FT_TRUETYPE_TAGS_H
28 #include FT_SERVICE_POSTSCRIPT_CMAPS_H
29 #include "sferrors.h"
30
31 #ifdef TT_CONFIG_OPTION_BDF
32 #include "ttbdf.h"
33 #endif
34
35
36 /*************************************************************************/
37 /* */
38 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
39 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
40 /* messages during execution. */
41 /* */
42 #undef FT_COMPONENT
43 #define FT_COMPONENT trace_sfobjs
44
45
46
47 /* convert a UTF-16 name entry to ASCII */
48 static FT_String*
49 tt_name_entry_ascii_from_utf16( TT_NameEntry entry,
50 FT_Memory memory )
51 {
52 FT_String* string;
53 FT_UInt len, code, n;
54 FT_Byte* read = (FT_Byte*)entry->string;
55 FT_Error error;
56
57
58 len = (FT_UInt)entry->stringLength / 2;
59
60 if ( FT_NEW_ARRAY( string, len + 1 ) )
61 return NULL;
62
63 for ( n = 0; n < len; n++ )
64 {
65 code = FT_NEXT_USHORT( read );
66 if ( code < 32 || code > 127 )
67 code = '?';
68
69 string[n] = (char)code;
70 }
71
72 string[len] = 0;
73
74 return string;
75 }
76
77
78 /* convert an Apple Roman or symbol name entry to ASCII */
79 static FT_String*
80 tt_name_entry_ascii_from_other( TT_NameEntry entry,
81 FT_Memory memory )
82 {
83 FT_String* string;
84 FT_UInt len, code, n;
85 FT_Byte* read = (FT_Byte*)entry->string;
86 FT_Error error;
87
88
89 len = (FT_UInt)entry->stringLength;
90
91 if ( FT_NEW_ARRAY( string, len + 1 ) )
92 return NULL;
93
94 for ( n = 0; n < len; n++ )
95 {
96 code = *read++;
97 if ( code < 32 || code > 127 )
98 code = '?';
99
100 string[n] = (char)code;
101 }
102
103 string[len] = 0;
104
105 return string;
106 }
107
108
109 typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry,
110 FT_Memory memory );
111
112
113 /*************************************************************************/
114 /* */
115 /* <Function> */
116 /* tt_face_get_name */
117 /* */
118 /* <Description> */
119 /* Returns a given ENGLISH name record in ASCII. */
120 /* */
121 /* <Input> */
122 /* face :: A handle to the source face object. */
123 /* */
124 /* nameid :: The name id of the name record to return. */
125 /* */
126 /* <InOut> */
127 /* name :: The address of a string pointer. NULL if no name is */
128 /* present. */
129 /* */
130 /* <Return> */
131 /* FreeType error code. 0 means success. */
132 /* */
133 static FT_Error
134 tt_face_get_name( TT_Face face,
135 FT_UShort nameid,
136 FT_String** name )
137 {
138 FT_Memory memory = face->root.memory;
139 FT_Error error = SFNT_Err_Ok;
140 FT_String* result = NULL;
141 FT_UShort n;
142 TT_NameEntryRec* rec;
143 FT_Int found_apple = -1;
144 FT_Int found_apple_roman = -1;
145 FT_Int found_apple_english = -1;
146 FT_Int found_win = -1;
147 FT_Int found_unicode = -1;
148
149 FT_Bool is_english = 0;
150
151 TT_NameEntry_ConvertFunc convert;
152
153
154 FT_ASSERT( name );
155
156 rec = face->name_table.names;
157 for ( n = 0; n < face->num_names; n++, rec++ )
158 {
159 /* According to the OpenType 1.3 specification, only Microsoft or */
160 /* Apple platform IDs might be used in the `name' table. The */
161 /* `Unicode' platform is reserved for the `cmap' table, and the */
162 /* `Iso' one is deprecated. */
163 /* */
164 /* However, the Apple TrueType specification doesn't say the same */
165 /* thing and goes to suggest that all Unicode `name' table entries */
166 /* should be coded in UTF-16 (in big-endian format I suppose). */
167 /* */
168 if ( rec->nameID == nameid && rec->stringLength > 0 )
169 {
170 switch ( rec->platformID )
171 {
172 case TT_PLATFORM_APPLE_UNICODE:
173 case TT_PLATFORM_ISO:
174 /* there is `languageID' to check there. We should use this */
175 /* field only as a last solution when nothing else is */
176 /* available. */
177 /* */
178 found_unicode = n;
179 break;
180
181 case TT_PLATFORM_MACINTOSH:
182 /* This is a bit special because some fonts will use either */
183 /* an English language id, or a Roman encoding id, to indicate */
184 /* the English version of its font name. */
185 /* */
186 if ( rec->languageID == TT_MAC_LANGID_ENGLISH )
187 found_apple_english = n;
188 else if ( rec->encodingID == TT_MAC_ID_ROMAN )
189 found_apple_roman = n;
190 break;
191
192 case TT_PLATFORM_MICROSOFT:
193 /* we only take a non-English name when there is nothing */
194 /* else available in the font */
195 /* */
196 if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 )
197 {
198 switch ( rec->encodingID )
199 {
200 case TT_MS_ID_SYMBOL_CS:
201 case TT_MS_ID_UNICODE_CS:
202 case TT_MS_ID_UCS_4:
203 is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 );
204 found_win = n;
205 break;
206
207 default:
208 ;
209 }
210 }
211 break;
212
213 default:
214 ;
215 }
216 }
217 }
218
219 found_apple = found_apple_roman;
220 if ( found_apple_english >= 0 )
221 found_apple = found_apple_english;
222
223 /* some fonts contain invalid Unicode or Macintosh formatted entries; */
224 /* we will thus favor names encoded in Windows formats if available */
225 /* (provided it is an English name) */
226 /* */
227 convert = NULL;
228 if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) )
229 {
230 rec = face->name_table.names + found_win;
231 switch ( rec->encodingID )
232 {
233 /* all Unicode strings are encoded using UTF-16BE */
234 case TT_MS_ID_UNICODE_CS:
235 case TT_MS_ID_SYMBOL_CS:
236 convert = tt_name_entry_ascii_from_utf16;
237 break;
238
239 case TT_MS_ID_UCS_4:
240 /* Apparently, if this value is found in a name table entry, it is */
241 /* documented as `full Unicode repertoire'. Experience with the */
242 /* MsGothic font shipped with Windows Vista shows that this really */
243 /* means UTF-16 encoded names (UCS-4 values are only used within */
244 /* charmaps). */
245 convert = tt_name_entry_ascii_from_utf16;
246 break;
247
248 default:
249 ;
250 }
251 }
252 else if ( found_apple >= 0 )
253 {
254 rec = face->name_table.names + found_apple;
255 convert = tt_name_entry_ascii_from_other;
256 }
257 else if ( found_unicode >= 0 )
258 {
259 rec = face->name_table.names + found_unicode;
260 convert = tt_name_entry_ascii_from_utf16;
261 }
262
263 if ( rec && convert )
264 {
265 if ( rec->string == NULL )
266 {
267 FT_Stream stream = face->name_table.stream;
268
269
270 if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) ||
271 FT_STREAM_SEEK( rec->stringOffset ) ||
272 FT_STREAM_READ( rec->string, rec->stringLength ) )
273 {
274 FT_FREE( rec->string );
275 rec->stringLength = 0;
276 result = NULL;
277 goto Exit;
278 }
279 }
280
281 result = convert( rec, memory );
282 }
283
284 Exit:
285 *name = result;
286 return error;
287 }
288
289
290 static FT_Encoding
291 sfnt_find_encoding( int platform_id,
292 int encoding_id )
293 {
294 typedef struct TEncoding_
295 {
296 int platform_id;
297 int encoding_id;
298 FT_Encoding encoding;
299
300 } TEncoding;
301
302 static
303 const TEncoding tt_encodings[] =
304 {
305 { TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE },
306
307 { TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE },
308
309 { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN },
310
311 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL },
312 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE },
313 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE },
314 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS },
315 { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, FT_ENCODING_GB2312 },
316 { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 },
317 { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG },
318 { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB }
319 };
320
321 const TEncoding *cur, *limit;
322
323
324 cur = tt_encodings;
325 limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );
326
327 for ( ; cur < limit; cur++ )
328 {
329 if ( cur->platform_id == platform_id )
330 {
331 if ( cur->encoding_id == encoding_id ||
332 cur->encoding_id == -1 )
333 return cur->encoding;
334 }
335 }
336
337 return FT_ENCODING_NONE;
338 }
339
340
341 /* Fill in face->ttc_header. If the font is not a TTC, it is */
342 /* synthesized into a TTC with one offset table. */
343 static FT_Error
344 sfnt_open_font( FT_Stream stream,
345 TT_Face face )
346 {
347 FT_Memory memory = stream->memory;
348 FT_Error error;
349 FT_ULong tag, offset;
350
351 static const FT_Frame_Field ttc_header_fields[] =
352 {
353 #undef FT_STRUCTURE
354 #define FT_STRUCTURE TTC_HeaderRec
355
356 FT_FRAME_START( 8 ),
357 FT_FRAME_LONG( version ),
358 FT_FRAME_LONG( count ),
359 FT_FRAME_END
360 };
361
362
363 face->ttc_header.tag = 0;
364 face->ttc_header.version = 0;
365 face->ttc_header.count = 0;
366
367 offset = FT_STREAM_POS();
368
369 if ( FT_READ_ULONG( tag ) )
370 return error;
371
372 if ( tag != 0x00010000UL &&
373 tag != TTAG_ttcf &&
374 tag != TTAG_OTTO &&
375 tag != TTAG_true &&
376 tag != TTAG_typ1 &&
377 tag != 0x00020000UL )
378 return SFNT_Err_Unknown_File_Format;
379
380 face->ttc_header.tag = TTAG_ttcf;
381
382 if ( tag == TTAG_ttcf )
383 {
384 FT_Int n;
385
386
387 FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
388
389 if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
390 return error;
391
392 /* now read the offsets of each font in the file */
393 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
394 return error;
395
396 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
397 return error;
398
399 for ( n = 0; n < face->ttc_header.count; n++ )
400 face->ttc_header.offsets[n] = FT_GET_ULONG();
401
402 FT_FRAME_EXIT();
403 }
404 else
405 {
406 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
407
408 face->ttc_header.version = 1 << 16;
409 face->ttc_header.count = 1;
410
411 if ( FT_NEW( face->ttc_header.offsets ) )
412 return error;
413
414 face->ttc_header.offsets[0] = offset;
415 }
416
417 return error;
418 }
419
420
421 FT_LOCAL_DEF( FT_Error )
422 sfnt_init_face( FT_Stream stream,
423 TT_Face face,
424 FT_Int face_index,
425 FT_Int num_params,
426 FT_Parameter* params )
427 {
428 FT_Error error;
429 FT_Library library = face->root.driver->root.library;
430 SFNT_Service sfnt;
431
432
433 /* for now, parameters are unused */
434 FT_UNUSED( num_params );
435 FT_UNUSED( params );
436
437
438 sfnt = (SFNT_Service)face->sfnt;
439 if ( !sfnt )
440 {
441 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
442 if ( !sfnt )
443 return SFNT_Err_Invalid_File_Format;
444
445 face->sfnt = sfnt;
446 face->goto_table = sfnt->goto_table;
447 }
448
449 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
450
451 error = sfnt_open_font( stream, face );
452 if ( error )
453 return error;
454
455 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
456
457 if ( face_index < 0 )
458 face_index = 0;
459
460 if ( face_index >= face->ttc_header.count )
461 return SFNT_Err_Invalid_Argument;
462
463 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
464 return error;
465
466 /* check that we have a valid TrueType file */
467 error = sfnt->load_font_dir( face, stream );
468 if ( error )
469 return error;
470
471 face->root.num_faces = face->ttc_header.count;
472 face->root.face_index = face_index;
473
474 return error;
475 }
476
477
478 #define LOAD_( x ) \
479 do { \
480 FT_TRACE2(( "`" #x "' " )); \
481 FT_TRACE3(( "-->\n" )); \
482 \
483 error = sfnt->load_##x( face, stream ); \
484 \
485 FT_TRACE2(( "%s\n", ( !error ) \
486 ? "loaded" \
487 : ( error == SFNT_Err_Table_Missing ) \
488 ? "missing" \
489 : "failed to load" )); \
490 FT_TRACE3(( "\n" )); \
491 } while ( 0 )
492
493 #define LOADM_( x, vertical ) \
494 do { \
495 FT_TRACE2(( "`%s" #x "' ", \
496 vertical ? "vertical " : "" )); \
497 FT_TRACE3(( "-->\n" )); \
498 \
499 error = sfnt->load_##x( face, stream, vertical ); \
500 \
501 FT_TRACE2(( "%s\n", ( !error ) \
502 ? "loaded" \
503 : ( error == SFNT_Err_Table_Missing ) \
504 ? "missing" \
505 : "failed to load" )); \
506 FT_TRACE3(( "\n" )); \
507 } while ( 0 )
508
509 #define GET_NAME( id, field ) \
510 do { \
511 error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \
512 if ( error ) \
513 goto Exit; \
514 } while ( 0 )
515
516
517 FT_LOCAL_DEF( FT_Error )
518 sfnt_load_face( FT_Stream stream,
519 TT_Face face,
520 FT_Int face_index,
521 FT_Int num_params,
522 FT_Parameter* params )
523 {
524 FT_Error error;
525 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
526 FT_Error psnames_error;
527 #endif
528 FT_Bool has_outline;
529 FT_Bool is_apple_sbit;
530
531 SFNT_Service sfnt = (SFNT_Service)face->sfnt;
532
533 FT_UNUSED( face_index );
534 FT_UNUSED( num_params );
535 FT_UNUSED( params );
536
537
538 /* Load tables */
539
540 /* We now support two SFNT-based bitmapped font formats. They */
541 /* are recognized easily as they do not include a `glyf' */
542 /* table. */
543 /* */
544 /* The first format comes from Apple, and uses a table named */
545 /* `bhed' instead of `head' to store the font header (using */
546 /* the same format). It also doesn't include horizontal and */
547 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */
548 /* missing). */
549 /* */
550 /* The other format comes from Microsoft, and is used with */
551 /* WinCE/PocketPC. It looks like a standard TTF, except that */
552 /* it doesn't contain outlines. */
553 /* */
554
555 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
556
557 /* do we have outlines in there? */
558 #ifdef FT_CONFIG_OPTION_INCREMENTAL
559 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 ||
560 tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
561 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
562 #else
563 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
564 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
565 #endif
566
567 is_apple_sbit = 0;
568
569 /* if this font doesn't contain outlines, we try to load */
570 /* a `bhed' table */
571 if ( !has_outline && sfnt->load_bhed )
572 {
573 LOAD_( bhed );
574 is_apple_sbit = FT_BOOL( !error );
575 }
576
577 /* load the font header (`head' table) if this isn't an Apple */
578 /* sbit font file */
579 if ( !is_apple_sbit )
580 {
581 LOAD_( head );
582 if ( error )
583 goto Exit;
584 }
585
586 if ( face->header.Units_Per_EM == 0 )
587 {
588 error = SFNT_Err_Invalid_Table;
589
590 goto Exit;
591 }
592
593 /* the following tables are often not present in embedded TrueType */
594 /* fonts within PDF documents, so don't check for them. */
595 LOAD_( maxp );
596 LOAD_( cmap );
597
598 /* the following tables are optional in PCL fonts -- */
599 /* don't check for errors */
600 LOAD_( name );
601 LOAD_( post );
602
603 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
604 psnames_error = error;
605 #endif
606
607 /* do not load the metrics headers and tables if this is an Apple */
608 /* sbit font file */
609 if ( !is_apple_sbit )
610 {
611 /* load the `hhea' and `hmtx' tables */
612 LOADM_( hhea, 0 );
613 if ( !error )
614 {
615 LOADM_( hmtx, 0 );
616 if ( error == SFNT_Err_Table_Missing )
617 {
618 error = SFNT_Err_Hmtx_Table_Missing;
619
620 #ifdef FT_CONFIG_OPTION_INCREMENTAL
621 /* If this is an incrementally loaded font and there are */
622 /* overriding metrics, tolerate a missing `hmtx' table. */
623 if ( face->root.internal->incremental_interface &&
624 face->root.internal->incremental_interface->funcs->
625 get_glyph_metrics )
626 {
627 face->horizontal.number_Of_HMetrics = 0;
628 error = SFNT_Err_Ok;
629 }
630 #endif
631 }
632 }
633 else if ( error == SFNT_Err_Table_Missing )
634 {
635 /* No `hhea' table necessary for SFNT Mac fonts. */
636 if ( face->format_tag == TTAG_true )
637 {
638 FT_TRACE2(( "This is an SFNT Mac font.\n" ));
639 has_outline = 0;
640 error = SFNT_Err_Ok;
641 }
642 else
643 {
644 error = SFNT_Err_Horiz_Header_Missing;
645
646 #ifdef FT_CONFIG_OPTION_INCREMENTAL
647 /* If this is an incrementally loaded font and there are */
648 /* overriding metrics, tolerate a missing `hhea' table. */
649 if ( face->root.internal->incremental_interface &&
650 face->root.internal->incremental_interface->funcs->
651 get_glyph_metrics )
652 {
653 face->horizontal.number_Of_HMetrics = 0;
654 error = SFNT_Err_Ok;
655 }
656 #endif
657
658 }
659 }
660
661 if ( error )
662 goto Exit;
663
664 /* try to load the `vhea' and `vmtx' tables */
665 LOADM_( hhea, 1 );
666 if ( !error )
667 {
668 LOADM_( hmtx, 1 );
669 if ( !error )
670 face->vertical_info = 1;
671 }
672
673 if ( error && error != SFNT_Err_Table_Missing )
674 goto Exit;
675
676 LOAD_( os2 );
677 if ( error )
678 {
679 if ( error != SFNT_Err_Table_Missing )
680 goto Exit;
681
682 face->os2.version = 0xFFFFU;
683 }
684 }
685
686 /* the optional tables */
687
688 /* embedded bitmap support */
689 if ( sfnt->load_eblc )
690 {
691 LOAD_( eblc );
692 if ( error )
693 {
694 /* a font which contains neither bitmaps nor outlines is */
695 /* still valid (although rather useless in most cases); */
696 /* however, you can find such stripped fonts in PDFs */
697 if ( error == SFNT_Err_Table_Missing )
698 error = SFNT_Err_Ok;
699 else
700 goto Exit;
701 }
702 }
703
704 LOAD_( pclt );
705 if ( error )
706 {
707 if ( error != SFNT_Err_Table_Missing )
708 goto Exit;
709
710 face->pclt.Version = 0;
711 }
712
713 /* consider the kerning and gasp tables as optional */
714 LOAD_( gasp );
715 LOAD_( kern );
716
717 face->root.num_glyphs = face->max_profile.numGlyphs;
718
719 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */
720 /* a WWS-only font face. `WWS' stands for `weight', width', and */
721 /* `slope', a term used by Microsoft's Windows Presentation */
722 /* Foundation (WPF). This flag has been introduced in version */
723 /* 1.5 of the OpenType specification (May 2008). */
724
725 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
726 {
727 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
728 if ( !face->root.family_name )
729 GET_NAME( FONT_FAMILY, &face->root.family_name );
730
731 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
732 if ( !face->root.style_name )
733 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
734 }
735 else
736 {
737 GET_NAME( WWS_FAMILY, &face->root.family_name );
738 if ( !face->root.family_name )
739 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
740 if ( !face->root.family_name )
741 GET_NAME( FONT_FAMILY, &face->root.family_name );
742
743 GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
744 if ( !face->root.style_name )
745 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
746 if ( !face->root.style_name )
747 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
748 }
749
750 /* now set up root fields */
751 {
752 FT_Face root = &face->root;
753 FT_Long flags = root->face_flags;
754
755
756 /*********************************************************************/
757 /* */
758 /* Compute face flags. */
759 /* */
760 if ( has_outline == TRUE )
761 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */
762
763 /* The sfnt driver only supports bitmap fonts natively, thus we */
764 /* don't set FT_FACE_FLAG_HINTER. */
765 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
766 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
767
768 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
769 if ( psnames_error == SFNT_Err_Ok &&
770 face->postscript.FormatType != 0x00030000L )
771 flags |= FT_FACE_FLAG_GLYPH_NAMES;
772 #endif
773
774 /* fixed width font? */
775 if ( face->postscript.isFixedPitch )
776 flags |= FT_FACE_FLAG_FIXED_WIDTH;
777
778 /* vertical information? */
779 if ( face->vertical_info )
780 flags |= FT_FACE_FLAG_VERTICAL;
781
782 /* kerning available ? */
783 if ( TT_FACE_HAS_KERNING( face ) )
784 flags |= FT_FACE_FLAG_KERNING;
785
786 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
787 /* Don't bother to load the tables unless somebody asks for them. */
788 /* No need to do work which will (probably) not be used. */
789 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
790 tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
791 tt_face_lookup_table( face, TTAG_gvar ) != 0 )
792 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
793 #endif
794
795 root->face_flags = flags;
796
797 /*********************************************************************/
798 /* */
799 /* Compute style flags. */
800 /* */
801
802 flags = 0;
803 if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
804 {
805 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */
806 /* indicates an oblique font face. This flag has been */
807 /* introduced in version 1.5 of the OpenType specification. */
808
809 if ( face->os2.fsSelection & 512 ) /* bit 9 */
810 flags |= FT_STYLE_FLAG_ITALIC;
811 else if ( face->os2.fsSelection & 1 ) /* bit 0 */
812 flags |= FT_STYLE_FLAG_ITALIC;
813
814 if ( face->os2.fsSelection & 32 ) /* bit 5 */
815 flags |= FT_STYLE_FLAG_BOLD;
816 }
817 else
818 {
819 /* this is an old Mac font, use the header field */
820
821 if ( face->header.Mac_Style & 1 )
822 flags |= FT_STYLE_FLAG_BOLD;
823
824 if ( face->header.Mac_Style & 2 )
825 flags |= FT_STYLE_FLAG_ITALIC;
826 }
827
828 root->style_flags = flags;
829
830 /*********************************************************************/
831 /* */
832 /* Polish the charmaps. */
833 /* */
834 /* Try to set the charmap encoding according to the platform & */
835 /* encoding ID of each charmap. */
836 /* */
837
838 tt_face_build_cmaps( face ); /* ignore errors */
839
840
841 /* set the encoding fields */
842 {
843 FT_Int m;
844
845
846 for ( m = 0; m < root->num_charmaps; m++ )
847 {
848 FT_CharMap charmap = root->charmaps[m];
849
850
851 charmap->encoding = sfnt_find_encoding( charmap->platform_id,
852 charmap->encoding_id );
853
854 #if 0
855 if ( root->charmap == NULL &&
856 charmap->encoding == FT_ENCODING_UNICODE )
857 {
858 /* set 'root->charmap' to the first Unicode encoding we find */
859 root->charmap = charmap;
860 }
861 #endif
862 }
863 }
864
865 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
866
867 /*
868 * Now allocate the root array of FT_Bitmap_Size records and
869 * populate them. Unfortunately, it isn't possible to indicate bit
870 * depths in the FT_Bitmap_Size record. This is a design error.
871 */
872 {
873 FT_UInt i, count;
874
875
876 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
877 count = face->sbit_num_strikes;
878 #else
879 count = (FT_UInt)face->num_sbit_strikes;
880 #endif
881
882 if ( count > 0 )
883 {
884 FT_Memory memory = face->root.stream->memory;
885 FT_UShort em_size = face->header.Units_Per_EM;
886 FT_Short avgwidth = face->os2.xAvgCharWidth;
887 FT_Size_Metrics metrics;
888
889
890 if ( em_size == 0 || face->os2.version == 0xFFFFU )
891 {
892 avgwidth = 0;
893 em_size = 1;
894 }
895
896 if ( FT_NEW_ARRAY( root->available_sizes, count ) )
897 goto Exit;
898
899 for ( i = 0; i < count; i++ )
900 {
901 FT_Bitmap_Size* bsize = root->available_sizes + i;
902
903
904 error = sfnt->load_strike_metrics( face, i, &metrics );
905 if ( error )
906 goto Exit;
907
908 bsize->height = (FT_Short)( metrics.height >> 6 );
909 bsize->width = (FT_Short)(
910 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
911
912 bsize->x_ppem = metrics.x_ppem << 6;
913 bsize->y_ppem = metrics.y_ppem << 6;
914
915 /* assume 72dpi */
916 bsize->size = metrics.y_ppem << 6;
917 }
918
919 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
920 root->num_fixed_sizes = (FT_Int)count;
921 }
922 }
923
924 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
925
926 /* a font with no bitmaps and no outlines is scalable; */
927 /* it has only empty glyphs then */
928 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
929 root->face_flags |= FT_FACE_FLAG_SCALABLE;
930
931
932 /*********************************************************************/
933 /* */
934 /* Set up metrics. */
935 /* */
936 if ( FT_IS_SCALABLE( root ) )
937 {
938 /* XXX What about if outline header is missing */
939 /* (e.g. sfnt wrapped bitmap)? */
940 root->bbox.xMin = face->header.xMin;
941 root->bbox.yMin = face->header.yMin;
942 root->bbox.xMax = face->header.xMax;
943 root->bbox.yMax = face->header.yMax;
944 root->units_per_EM = face->header.Units_Per_EM;
945
946
947 /* XXX: Computing the ascender/descender/height is very different */
948 /* from what the specification tells you. Apparently, we */
949 /* must be careful because */
950 /* */
951 /* - not all fonts have an OS/2 table; in this case, we take */
952 /* the values in the horizontal header. However, these */
953 /* values very often are not reliable. */
954 /* */
955 /* - otherwise, the correct typographic values are in the */
956 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
957 /* */
958 /* However, certain fonts have these fields set to 0. */
959 /* Rather, they have usWinAscent & usWinDescent correctly */
960 /* set (but with different values). */
961 /* */
962 /* As an example, Arial Narrow is implemented through four */
963 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
964 /* */
965 /* Strangely, all fonts have the same values in their */
966 /* sTypoXXX fields, except ARIALNB which sets them to 0. */
967 /* */
968 /* On the other hand, they all have different */
969 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */
970 /* table cannot be used to compute the text height reliably! */
971 /* */
972
973 /* The ascender/descender/height are computed from the OS/2 table */
974 /* when found. Otherwise, they're taken from the horizontal */
975 /* header. */
976 /* */
977
978 root->ascender = face->horizontal.Ascender;
979 root->descender = face->horizontal.Descender;
980
981 root->height = (FT_Short)( root->ascender - root->descender +
982 face->horizontal.Line_Gap );
983
984 #if 0
985 /* if the line_gap is 0, we add an extra 15% to the text height -- */
986 /* this computation is based on various versions of Times New Roman */
987 if ( face->horizontal.Line_Gap == 0 )
988 root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 );
989 #endif /* 0 */
990
991 #if 0
992 /* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
993 /* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */
994 if ( face->os2.version != 0xFFFFU && root->ascender )
995 {
996 FT_Int height;
997
998
999 root->ascender = face->os2.sTypoAscender;
1000 root->descender = -face->os2.sTypoDescender;
1001
1002 height = root->ascender + root->descender + face->os2.sTypoLineGap;
1003 if ( height > root->height )
1004 root->height = height;
1005 }
1006 #endif /* 0 */
1007
1008 root->max_advance_width = face->horizontal.advance_Width_Max;
1009 root->max_advance_height = (FT_Short)( face->vertical_info
1010 ? face->vertical.advance_Height_Max
1011 : root->height );
1012
1013 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
1014 /* Adjust underline position from top edge to centre of */
1015 /* stroke to convert TrueType meaning to FreeType meaning. */
1016 root->underline_position = face->postscript.underlinePosition -
1017 face->postscript.underlineThickness / 2;
1018 root->underline_thickness = face->postscript.underlineThickness;
1019 }
1020
1021 }
1022
1023 Exit:
1024 FT_TRACE2(( "sfnt_load_face: done\n" ));
1025
1026 return error;
1027 }
1028
1029
1030 #undef LOAD_
1031 #undef LOADM_
1032 #undef GET_NAME
1033
1034
1035 FT_LOCAL_DEF( void )
1036 sfnt_done_face( TT_Face face )
1037 {
1038 FT_Memory memory;
1039 SFNT_Service sfnt;
1040
1041
1042 if ( !face )
1043 return;
1044
1045 memory = face->root.memory;
1046 sfnt = (SFNT_Service)face->sfnt;
1047
1048 if ( sfnt )
1049 {
1050 /* destroy the postscript names table if it is loaded */
1051 if ( sfnt->free_psnames )
1052 sfnt->free_psnames( face );
1053
1054 /* destroy the embedded bitmaps table if it is loaded */
1055 if ( sfnt->free_eblc )
1056 sfnt->free_eblc( face );
1057 }
1058
1059 #ifdef TT_CONFIG_OPTION_BDF
1060 /* freeing the embedded BDF properties */
1061 tt_face_free_bdf_props( face );
1062 #endif
1063
1064 /* freeing the kerning table */
1065 tt_face_done_kern( face );
1066
1067 /* freeing the collection table */
1068 FT_FREE( face->ttc_header.offsets );
1069 face->ttc_header.count = 0;
1070
1071 /* freeing table directory */
1072 FT_FREE( face->dir_tables );
1073 face->num_tables = 0;
1074
1075 {
1076 FT_Stream stream = FT_FACE_STREAM( face );
1077
1078
1079 /* simply release the 'cmap' table frame */
1080 FT_FRAME_RELEASE( face->cmap_table );
1081 face->cmap_size = 0;
1082 }
1083
1084 /* freeing the horizontal metrics */
1085 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
1086 {
1087 FT_Stream stream = FT_FACE_STREAM( face );
1088
1089
1090 FT_FRAME_RELEASE( face->horz_metrics );
1091 FT_FRAME_RELEASE( face->vert_metrics );
1092 face->horz_metrics_size = 0;
1093 face->vert_metrics_size = 0;
1094 }
1095 #else
1096 FT_FREE( face->horizontal.long_metrics );
1097 FT_FREE( face->horizontal.short_metrics );
1098 #endif
1099
1100 /* freeing the vertical ones, if any */
1101 if ( face->vertical_info )
1102 {
1103 FT_FREE( face->vertical.long_metrics );
1104 FT_FREE( face->vertical.short_metrics );
1105 face->vertical_info = 0;
1106 }
1107
1108 /* freeing the gasp table */
1109 FT_FREE( face->gasp.gaspRanges );
1110 face->gasp.numRanges = 0;
1111
1112 /* freeing the name table */
1113 if ( sfnt )
1114 sfnt->free_name( face );
1115
1116 /* freeing family and style name */
1117 FT_FREE( face->root.family_name );
1118 FT_FREE( face->root.style_name );
1119
1120 /* freeing sbit size table */
1121 FT_FREE( face->root.available_sizes );
1122 face->root.num_fixed_sizes = 0;
1123
1124 FT_FREE( face->postscript_name );
1125
1126 face->sfnt = 0;
1127 }
1128
1129
1130 /* END */
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