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[reactos.git] / 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 FT_SFNT_NAMES_H
30 #include "sferrors.h"
31
32 #ifdef TT_CONFIG_OPTION_BDF
33 #include "ttbdf.h"
34 #endif
35
36
37 /*************************************************************************/
38 /* */
39 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
40 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
41 /* messages during execution. */
42 /* */
43 #undef FT_COMPONENT
44 #define FT_COMPONENT trace_sfobjs
45
46
47
48 /* convert a UTF-16 name entry to ASCII */
49 static FT_String*
50 tt_name_entry_ascii_from_utf16( TT_NameEntry entry,
51 FT_Memory memory )
52 {
53 FT_String* string;
54 FT_UInt len, code, n;
55 FT_Byte* read = (FT_Byte*)entry->string;
56 FT_Error error;
57
58
59 len = (FT_UInt)entry->stringLength / 2;
60
61 if ( FT_NEW_ARRAY( string, len + 1 ) )
62 return NULL;
63
64 for ( n = 0; n < len; n++ )
65 {
66 code = FT_NEXT_USHORT( read );
67 if ( code < 32 || code > 127 )
68 code = '?';
69
70 string[n] = (char)code;
71 }
72
73 string[len] = 0;
74
75 return string;
76 }
77
78
79 /* convert an Apple Roman or symbol name entry to ASCII */
80 static FT_String*
81 tt_name_entry_ascii_from_other( TT_NameEntry entry,
82 FT_Memory memory )
83 {
84 FT_String* string;
85 FT_UInt len, code, n;
86 FT_Byte* read = (FT_Byte*)entry->string;
87 FT_Error error;
88
89
90 len = (FT_UInt)entry->stringLength;
91
92 if ( FT_NEW_ARRAY( string, len + 1 ) )
93 return NULL;
94
95 for ( n = 0; n < len; n++ )
96 {
97 code = *read++;
98 if ( code < 32 || code > 127 )
99 code = '?';
100
101 string[n] = (char)code;
102 }
103
104 string[len] = 0;
105
106 return string;
107 }
108
109
110 typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry,
111 FT_Memory memory );
112
113
114 /*************************************************************************/
115 /* */
116 /* <Function> */
117 /* tt_face_get_name */
118 /* */
119 /* <Description> */
120 /* Returns a given ENGLISH name record in ASCII. */
121 /* */
122 /* <Input> */
123 /* face :: A handle to the source face object. */
124 /* */
125 /* nameid :: The name id of the name record to return. */
126 /* */
127 /* <InOut> */
128 /* name :: The address of a string pointer. NULL if no name is */
129 /* present. */
130 /* */
131 /* <Return> */
132 /* FreeType error code. 0 means success. */
133 /* */
134 static FT_Error
135 tt_face_get_name( TT_Face face,
136 FT_UShort nameid,
137 FT_String** name )
138 {
139 FT_Memory memory = face->root.memory;
140 FT_Error error = SFNT_Err_Ok;
141 FT_String* result = NULL;
142 FT_UShort n;
143 TT_NameEntryRec* rec;
144 FT_Int found_apple = -1;
145 FT_Int found_apple_roman = -1;
146 FT_Int found_apple_english = -1;
147 FT_Int found_win = -1;
148 FT_Int found_unicode = -1;
149
150 FT_Bool is_english = 0;
151
152 TT_NameEntry_ConvertFunc convert;
153
154
155 FT_ASSERT( name );
156
157 rec = face->name_table.names;
158 for ( n = 0; n < face->num_names; n++, rec++ )
159 {
160 /* According to the OpenType 1.3 specification, only Microsoft or */
161 /* Apple platform IDs might be used in the `name' table. The */
162 /* `Unicode' platform is reserved for the `cmap' table, and the */
163 /* `Iso' one is deprecated. */
164 /* */
165 /* However, the Apple TrueType specification doesn't say the same */
166 /* thing and goes to suggest that all Unicode `name' table entries */
167 /* should be coded in UTF-16 (in big-endian format I suppose). */
168 /* */
169 if ( rec->nameID == nameid && rec->stringLength > 0 )
170 {
171 switch ( rec->platformID )
172 {
173 case TT_PLATFORM_APPLE_UNICODE:
174 case TT_PLATFORM_ISO:
175 /* there is `languageID' to check there. We should use this */
176 /* field only as a last solution when nothing else is */
177 /* available. */
178 /* */
179 found_unicode = n;
180 break;
181
182 case TT_PLATFORM_MACINTOSH:
183 /* This is a bit special because some fonts will use either */
184 /* an English language id, or a Roman encoding id, to indicate */
185 /* the English version of its font name. */
186 /* */
187 if ( rec->languageID == TT_MAC_LANGID_ENGLISH )
188 found_apple_english = n;
189 else if ( rec->encodingID == TT_MAC_ID_ROMAN )
190 found_apple_roman = n;
191 break;
192
193 case TT_PLATFORM_MICROSOFT:
194 /* we only take a non-English name when there is nothing */
195 /* else available in the font */
196 /* */
197 if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 )
198 {
199 switch ( rec->encodingID )
200 {
201 case TT_MS_ID_SYMBOL_CS:
202 case TT_MS_ID_UNICODE_CS:
203 case TT_MS_ID_UCS_4:
204 is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 );
205 found_win = n;
206 break;
207
208 default:
209 ;
210 }
211 }
212 break;
213
214 default:
215 ;
216 }
217 }
218 }
219
220 found_apple = found_apple_roman;
221 if ( found_apple_english >= 0 )
222 found_apple = found_apple_english;
223
224 /* some fonts contain invalid Unicode or Macintosh formatted entries; */
225 /* we will thus favor names encoded in Windows formats if available */
226 /* (provided it is an English name) */
227 /* */
228 convert = NULL;
229 if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) )
230 {
231 rec = face->name_table.names + found_win;
232 switch ( rec->encodingID )
233 {
234 /* all Unicode strings are encoded using UTF-16BE */
235 case TT_MS_ID_UNICODE_CS:
236 case TT_MS_ID_SYMBOL_CS:
237 convert = tt_name_entry_ascii_from_utf16;
238 break;
239
240 case TT_MS_ID_UCS_4:
241 /* Apparently, if this value is found in a name table entry, it is */
242 /* documented as `full Unicode repertoire'. Experience with the */
243 /* MsGothic font shipped with Windows Vista shows that this really */
244 /* means UTF-16 encoded names (UCS-4 values are only used within */
245 /* charmaps). */
246 convert = tt_name_entry_ascii_from_utf16;
247 break;
248
249 default:
250 ;
251 }
252 }
253 else if ( found_apple >= 0 )
254 {
255 rec = face->name_table.names + found_apple;
256 convert = tt_name_entry_ascii_from_other;
257 }
258 else if ( found_unicode >= 0 )
259 {
260 rec = face->name_table.names + found_unicode;
261 convert = tt_name_entry_ascii_from_utf16;
262 }
263
264 if ( rec && convert )
265 {
266 if ( rec->string == NULL )
267 {
268 FT_Stream stream = face->name_table.stream;
269
270
271 if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) ||
272 FT_STREAM_SEEK( rec->stringOffset ) ||
273 FT_STREAM_READ( rec->string, rec->stringLength ) )
274 {
275 FT_FREE( rec->string );
276 rec->stringLength = 0;
277 result = NULL;
278 goto Exit;
279 }
280 }
281
282 result = convert( rec, memory );
283 }
284
285 Exit:
286 *name = result;
287 return error;
288 }
289
290
291 static FT_Encoding
292 sfnt_find_encoding( int platform_id,
293 int encoding_id )
294 {
295 typedef struct TEncoding_
296 {
297 int platform_id;
298 int encoding_id;
299 FT_Encoding encoding;
300
301 } TEncoding;
302
303 static
304 const TEncoding tt_encodings[] =
305 {
306 { TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE },
307
308 { TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE },
309
310 { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN },
311
312 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL },
313 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE },
314 { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE },
315 { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS },
316 { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, FT_ENCODING_GB2312 },
317 { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 },
318 { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG },
319 { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB }
320 };
321
322 const TEncoding *cur, *limit;
323
324
325 cur = tt_encodings;
326 limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );
327
328 for ( ; cur < limit; cur++ )
329 {
330 if ( cur->platform_id == platform_id )
331 {
332 if ( cur->encoding_id == encoding_id ||
333 cur->encoding_id == -1 )
334 return cur->encoding;
335 }
336 }
337
338 return FT_ENCODING_NONE;
339 }
340
341
342 /* Fill in face->ttc_header. If the font is not a TTC, it is */
343 /* synthesized into a TTC with one offset table. */
344 static FT_Error
345 sfnt_open_font( FT_Stream stream,
346 TT_Face face )
347 {
348 FT_Memory memory = stream->memory;
349 FT_Error error;
350 FT_ULong tag, offset;
351
352 static const FT_Frame_Field ttc_header_fields[] =
353 {
354 #undef FT_STRUCTURE
355 #define FT_STRUCTURE TTC_HeaderRec
356
357 FT_FRAME_START( 8 ),
358 FT_FRAME_LONG( version ),
359 FT_FRAME_LONG( count ),
360 FT_FRAME_END
361 };
362
363
364 face->ttc_header.tag = 0;
365 face->ttc_header.version = 0;
366 face->ttc_header.count = 0;
367
368 offset = FT_STREAM_POS();
369
370 if ( FT_READ_ULONG( tag ) )
371 return error;
372
373 if ( tag != 0x00010000UL &&
374 tag != TTAG_ttcf &&
375 tag != TTAG_OTTO &&
376 tag != TTAG_true &&
377 tag != TTAG_typ1 &&
378 tag != 0x00020000UL )
379 return SFNT_Err_Unknown_File_Format;
380
381 face->ttc_header.tag = TTAG_ttcf;
382
383 if ( tag == TTAG_ttcf )
384 {
385 FT_Int n;
386
387
388 FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
389
390 if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
391 return error;
392
393 /* now read the offsets of each font in the file */
394 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
395 return error;
396
397 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
398 return error;
399
400 for ( n = 0; n < face->ttc_header.count; n++ )
401 face->ttc_header.offsets[n] = FT_GET_ULONG();
402
403 FT_FRAME_EXIT();
404 }
405 else
406 {
407 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
408
409 face->ttc_header.version = 1 << 16;
410 face->ttc_header.count = 1;
411
412 if ( FT_NEW( face->ttc_header.offsets ) )
413 return error;
414
415 face->ttc_header.offsets[0] = offset;
416 }
417
418 return error;
419 }
420
421
422 FT_LOCAL_DEF( FT_Error )
423 sfnt_init_face( FT_Stream stream,
424 TT_Face face,
425 FT_Int face_index,
426 FT_Int num_params,
427 FT_Parameter* params )
428 {
429 FT_Error error;
430 FT_Library library = face->root.driver->root.library;
431 SFNT_Service sfnt;
432
433
434 /* for now, parameters are unused */
435 FT_UNUSED( num_params );
436 FT_UNUSED( params );
437
438
439 sfnt = (SFNT_Service)face->sfnt;
440 if ( !sfnt )
441 {
442 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
443 if ( !sfnt )
444 return SFNT_Err_Invalid_File_Format;
445
446 face->sfnt = sfnt;
447 face->goto_table = sfnt->goto_table;
448 }
449
450 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
451
452 error = sfnt_open_font( stream, face );
453 if ( error )
454 return error;
455
456 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
457
458 if ( face_index < 0 )
459 face_index = 0;
460
461 if ( face_index >= face->ttc_header.count )
462 return SFNT_Err_Invalid_Argument;
463
464 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
465 return error;
466
467 /* check that we have a valid TrueType file */
468 error = sfnt->load_font_dir( face, stream );
469 if ( error )
470 return error;
471
472 face->root.num_faces = face->ttc_header.count;
473 face->root.face_index = face_index;
474
475 return error;
476 }
477
478
479 #define LOAD_( x ) \
480 do { \
481 FT_TRACE2(( "`" #x "' " )); \
482 FT_TRACE3(( "-->\n" )); \
483 \
484 error = sfnt->load_##x( face, stream ); \
485 \
486 FT_TRACE2(( "%s\n", ( !error ) \
487 ? "loaded" \
488 : ( error == SFNT_Err_Table_Missing ) \
489 ? "missing" \
490 : "failed to load" )); \
491 FT_TRACE3(( "\n" )); \
492 } while ( 0 )
493
494 #define LOADM_( x, vertical ) \
495 do { \
496 FT_TRACE2(( "`%s" #x "' ", \
497 vertical ? "vertical " : "" )); \
498 FT_TRACE3(( "-->\n" )); \
499 \
500 error = sfnt->load_##x( face, stream, vertical ); \
501 \
502 FT_TRACE2(( "%s\n", ( !error ) \
503 ? "loaded" \
504 : ( error == SFNT_Err_Table_Missing ) \
505 ? "missing" \
506 : "failed to load" )); \
507 FT_TRACE3(( "\n" )); \
508 } while ( 0 )
509
510 #define GET_NAME( id, field ) \
511 do { \
512 error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \
513 if ( error ) \
514 goto Exit; \
515 } while ( 0 )
516
517
518 FT_LOCAL_DEF( FT_Error )
519 sfnt_load_face( FT_Stream stream,
520 TT_Face face,
521 FT_Int face_index,
522 FT_Int num_params,
523 FT_Parameter* params )
524 {
525 FT_Error error;
526 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
527 FT_Error psnames_error;
528 #endif
529 FT_Bool has_outline;
530 FT_Bool is_apple_sbit;
531 FT_Bool ignore_preferred_family = FALSE;
532 FT_Bool ignore_preferred_subfamily = FALSE;
533
534 SFNT_Service sfnt = (SFNT_Service)face->sfnt;
535
536 FT_UNUSED( face_index );
537
538 /* Check parameters */
539
540 {
541 FT_Int i;
542
543
544 for ( i = 0; i < num_params; i++ )
545 {
546 if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY )
547 ignore_preferred_family = TRUE;
548 else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY )
549 ignore_preferred_subfamily = TRUE;
550 }
551 }
552
553 /* Load tables */
554
555 /* We now support two SFNT-based bitmapped font formats. They */
556 /* are recognized easily as they do not include a `glyf' */
557 /* table. */
558 /* */
559 /* The first format comes from Apple, and uses a table named */
560 /* `bhed' instead of `head' to store the font header (using */
561 /* the same format). It also doesn't include horizontal and */
562 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */
563 /* missing). */
564 /* */
565 /* The other format comes from Microsoft, and is used with */
566 /* WinCE/PocketPC. It looks like a standard TTF, except that */
567 /* it doesn't contain outlines. */
568 /* */
569
570 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
571
572 /* do we have outlines in there? */
573 #ifdef FT_CONFIG_OPTION_INCREMENTAL
574 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 ||
575 tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
576 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
577 #else
578 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
579 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
580 #endif
581
582 is_apple_sbit = 0;
583
584 /* if this font doesn't contain outlines, we try to load */
585 /* a `bhed' table */
586 if ( !has_outline && sfnt->load_bhed )
587 {
588 LOAD_( bhed );
589 is_apple_sbit = FT_BOOL( !error );
590 }
591
592 /* load the font header (`head' table) if this isn't an Apple */
593 /* sbit font file */
594 if ( !is_apple_sbit )
595 {
596 LOAD_( head );
597 if ( error )
598 goto Exit;
599 }
600
601 if ( face->header.Units_Per_EM == 0 )
602 {
603 error = SFNT_Err_Invalid_Table;
604
605 goto Exit;
606 }
607
608 /* the following tables are often not present in embedded TrueType */
609 /* fonts within PDF documents, so don't check for them. */
610 LOAD_( maxp );
611 LOAD_( cmap );
612
613 /* the following tables are optional in PCL fonts -- */
614 /* don't check for errors */
615 LOAD_( name );
616 LOAD_( post );
617
618 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
619 psnames_error = error;
620 #endif
621
622 /* do not load the metrics headers and tables if this is an Apple */
623 /* sbit font file */
624 if ( !is_apple_sbit )
625 {
626 /* load the `hhea' and `hmtx' tables */
627 LOADM_( hhea, 0 );
628 if ( !error )
629 {
630 LOADM_( hmtx, 0 );
631 if ( error == SFNT_Err_Table_Missing )
632 {
633 error = SFNT_Err_Hmtx_Table_Missing;
634
635 #ifdef FT_CONFIG_OPTION_INCREMENTAL
636 /* If this is an incrementally loaded font and there are */
637 /* overriding metrics, tolerate a missing `hmtx' table. */
638 if ( face->root.internal->incremental_interface &&
639 face->root.internal->incremental_interface->funcs->
640 get_glyph_metrics )
641 {
642 face->horizontal.number_Of_HMetrics = 0;
643 error = SFNT_Err_Ok;
644 }
645 #endif
646 }
647 }
648 else if ( error == SFNT_Err_Table_Missing )
649 {
650 /* No `hhea' table necessary for SFNT Mac fonts. */
651 if ( face->format_tag == TTAG_true )
652 {
653 FT_TRACE2(( "This is an SFNT Mac font.\n" ));
654 has_outline = 0;
655 error = SFNT_Err_Ok;
656 }
657 else
658 {
659 error = SFNT_Err_Horiz_Header_Missing;
660
661 #ifdef FT_CONFIG_OPTION_INCREMENTAL
662 /* If this is an incrementally loaded font and there are */
663 /* overriding metrics, tolerate a missing `hhea' table. */
664 if ( face->root.internal->incremental_interface &&
665 face->root.internal->incremental_interface->funcs->
666 get_glyph_metrics )
667 {
668 face->horizontal.number_Of_HMetrics = 0;
669 error = SFNT_Err_Ok;
670 }
671 #endif
672
673 }
674 }
675
676 if ( error )
677 goto Exit;
678
679 /* try to load the `vhea' and `vmtx' tables */
680 LOADM_( hhea, 1 );
681 if ( !error )
682 {
683 LOADM_( hmtx, 1 );
684 if ( !error )
685 face->vertical_info = 1;
686 }
687
688 if ( error && error != SFNT_Err_Table_Missing )
689 goto Exit;
690
691 LOAD_( os2 );
692 if ( error )
693 {
694 if ( error != SFNT_Err_Table_Missing )
695 goto Exit;
696
697 face->os2.version = 0xFFFFU;
698 }
699 }
700
701 /* the optional tables */
702
703 /* embedded bitmap support */
704 if ( sfnt->load_eblc )
705 {
706 LOAD_( eblc );
707 if ( error )
708 {
709 /* a font which contains neither bitmaps nor outlines is */
710 /* still valid (although rather useless in most cases); */
711 /* however, you can find such stripped fonts in PDFs */
712 if ( error == SFNT_Err_Table_Missing )
713 error = SFNT_Err_Ok;
714 else
715 goto Exit;
716 }
717 }
718
719 LOAD_( pclt );
720 if ( error )
721 {
722 if ( error != SFNT_Err_Table_Missing )
723 goto Exit;
724
725 face->pclt.Version = 0;
726 }
727
728 /* consider the kerning and gasp tables as optional */
729 LOAD_( gasp );
730 LOAD_( kern );
731
732 face->root.num_glyphs = face->max_profile.numGlyphs;
733
734 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */
735 /* a WWS-only font face. `WWS' stands for `weight', width', and */
736 /* `slope', a term used by Microsoft's Windows Presentation */
737 /* Foundation (WPF). This flag has been introduced in version */
738 /* 1.5 of the OpenType specification (May 2008). */
739
740 face->root.family_name = NULL;
741 face->root.style_name = NULL;
742 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
743 {
744 if ( !ignore_preferred_family )
745 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
746 if ( !face->root.family_name )
747 GET_NAME( FONT_FAMILY, &face->root.family_name );
748
749 if ( !ignore_preferred_subfamily )
750 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
751 if ( !face->root.style_name )
752 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
753 }
754 else
755 {
756 GET_NAME( WWS_FAMILY, &face->root.family_name );
757 if ( !face->root.family_name && !ignore_preferred_family )
758 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
759 if ( !face->root.family_name )
760 GET_NAME( FONT_FAMILY, &face->root.family_name );
761
762 GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
763 if ( !face->root.style_name && !ignore_preferred_subfamily )
764 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
765 if ( !face->root.style_name )
766 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
767 }
768
769 /* now set up root fields */
770 {
771 FT_Face root = &face->root;
772 FT_Long flags = root->face_flags;
773
774
775 /*********************************************************************/
776 /* */
777 /* Compute face flags. */
778 /* */
779 if ( has_outline == TRUE )
780 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */
781
782 /* The sfnt driver only supports bitmap fonts natively, thus we */
783 /* don't set FT_FACE_FLAG_HINTER. */
784 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
785 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
786
787 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
788 if ( psnames_error == SFNT_Err_Ok &&
789 face->postscript.FormatType != 0x00030000L )
790 flags |= FT_FACE_FLAG_GLYPH_NAMES;
791 #endif
792
793 /* fixed width font? */
794 if ( face->postscript.isFixedPitch )
795 flags |= FT_FACE_FLAG_FIXED_WIDTH;
796
797 /* vertical information? */
798 if ( face->vertical_info )
799 flags |= FT_FACE_FLAG_VERTICAL;
800
801 /* kerning available ? */
802 if ( TT_FACE_HAS_KERNING( face ) )
803 flags |= FT_FACE_FLAG_KERNING;
804
805 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
806 /* Don't bother to load the tables unless somebody asks for them. */
807 /* No need to do work which will (probably) not be used. */
808 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
809 tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
810 tt_face_lookup_table( face, TTAG_gvar ) != 0 )
811 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
812 #endif
813
814 root->face_flags = flags;
815
816 /*********************************************************************/
817 /* */
818 /* Compute style flags. */
819 /* */
820
821 flags = 0;
822 if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
823 {
824 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */
825 /* indicates an oblique font face. This flag has been */
826 /* introduced in version 1.5 of the OpenType specification. */
827
828 if ( face->os2.fsSelection & 512 ) /* bit 9 */
829 flags |= FT_STYLE_FLAG_ITALIC;
830 else if ( face->os2.fsSelection & 1 ) /* bit 0 */
831 flags |= FT_STYLE_FLAG_ITALIC;
832
833 if ( face->os2.fsSelection & 32 ) /* bit 5 */
834 flags |= FT_STYLE_FLAG_BOLD;
835 }
836 else
837 {
838 /* this is an old Mac font, use the header field */
839
840 if ( face->header.Mac_Style & 1 )
841 flags |= FT_STYLE_FLAG_BOLD;
842
843 if ( face->header.Mac_Style & 2 )
844 flags |= FT_STYLE_FLAG_ITALIC;
845 }
846
847 root->style_flags = flags;
848
849 /*********************************************************************/
850 /* */
851 /* Polish the charmaps. */
852 /* */
853 /* Try to set the charmap encoding according to the platform & */
854 /* encoding ID of each charmap. */
855 /* */
856
857 tt_face_build_cmaps( face ); /* ignore errors */
858
859
860 /* set the encoding fields */
861 {
862 FT_Int m;
863
864
865 for ( m = 0; m < root->num_charmaps; m++ )
866 {
867 FT_CharMap charmap = root->charmaps[m];
868
869
870 charmap->encoding = sfnt_find_encoding( charmap->platform_id,
871 charmap->encoding_id );
872
873 #if 0
874 if ( root->charmap == NULL &&
875 charmap->encoding == FT_ENCODING_UNICODE )
876 {
877 /* set 'root->charmap' to the first Unicode encoding we find */
878 root->charmap = charmap;
879 }
880 #endif
881 }
882 }
883
884 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
885
886 /*
887 * Now allocate the root array of FT_Bitmap_Size records and
888 * populate them. Unfortunately, it isn't possible to indicate bit
889 * depths in the FT_Bitmap_Size record. This is a design error.
890 */
891 {
892 FT_UInt i, count;
893
894
895 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
896 count = face->sbit_num_strikes;
897 #else
898 count = (FT_UInt)face->num_sbit_strikes;
899 #endif
900
901 if ( count > 0 )
902 {
903 FT_Memory memory = face->root.stream->memory;
904 FT_UShort em_size = face->header.Units_Per_EM;
905 FT_Short avgwidth = face->os2.xAvgCharWidth;
906 FT_Size_Metrics metrics;
907
908
909 if ( em_size == 0 || face->os2.version == 0xFFFFU )
910 {
911 avgwidth = 0;
912 em_size = 1;
913 }
914
915 if ( FT_NEW_ARRAY( root->available_sizes, count ) )
916 goto Exit;
917
918 for ( i = 0; i < count; i++ )
919 {
920 FT_Bitmap_Size* bsize = root->available_sizes + i;
921
922
923 error = sfnt->load_strike_metrics( face, i, &metrics );
924 if ( error )
925 goto Exit;
926
927 bsize->height = (FT_Short)( metrics.height >> 6 );
928 bsize->width = (FT_Short)(
929 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
930
931 bsize->x_ppem = metrics.x_ppem << 6;
932 bsize->y_ppem = metrics.y_ppem << 6;
933
934 /* assume 72dpi */
935 bsize->size = metrics.y_ppem << 6;
936 }
937
938 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
939 root->num_fixed_sizes = (FT_Int)count;
940 }
941 }
942
943 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
944
945 /* a font with no bitmaps and no outlines is scalable; */
946 /* it has only empty glyphs then */
947 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
948 root->face_flags |= FT_FACE_FLAG_SCALABLE;
949
950
951 /*********************************************************************/
952 /* */
953 /* Set up metrics. */
954 /* */
955 if ( FT_IS_SCALABLE( root ) )
956 {
957 /* XXX What about if outline header is missing */
958 /* (e.g. sfnt wrapped bitmap)? */
959 root->bbox.xMin = face->header.xMin;
960 root->bbox.yMin = face->header.yMin;
961 root->bbox.xMax = face->header.xMax;
962 root->bbox.yMax = face->header.yMax;
963 root->units_per_EM = face->header.Units_Per_EM;
964
965
966 /* XXX: Computing the ascender/descender/height is very different */
967 /* from what the specification tells you. Apparently, we */
968 /* must be careful because */
969 /* */
970 /* - not all fonts have an OS/2 table; in this case, we take */
971 /* the values in the horizontal header. However, these */
972 /* values very often are not reliable. */
973 /* */
974 /* - otherwise, the correct typographic values are in the */
975 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
976 /* */
977 /* However, certain fonts have these fields set to 0. */
978 /* Rather, they have usWinAscent & usWinDescent correctly */
979 /* set (but with different values). */
980 /* */
981 /* As an example, Arial Narrow is implemented through four */
982 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
983 /* */
984 /* Strangely, all fonts have the same values in their */
985 /* sTypoXXX fields, except ARIALNB which sets them to 0. */
986 /* */
987 /* On the other hand, they all have different */
988 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */
989 /* table cannot be used to compute the text height reliably! */
990 /* */
991
992 /* The ascender/descender/height are computed from the OS/2 table */
993 /* when found. Otherwise, they're taken from the horizontal */
994 /* header. */
995 /* */
996
997 root->ascender = face->horizontal.Ascender;
998 root->descender = face->horizontal.Descender;
999
1000 root->height = (FT_Short)( root->ascender - root->descender +
1001 face->horizontal.Line_Gap );
1002
1003 #if 0
1004 /* if the line_gap is 0, we add an extra 15% to the text height -- */
1005 /* this computation is based on various versions of Times New Roman */
1006 if ( face->horizontal.Line_Gap == 0 )
1007 root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 );
1008 #endif /* 0 */
1009
1010 #if 0
1011 /* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
1012 /* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */
1013 if ( face->os2.version != 0xFFFFU && root->ascender )
1014 {
1015 FT_Int height;
1016
1017
1018 root->ascender = face->os2.sTypoAscender;
1019 root->descender = -face->os2.sTypoDescender;
1020
1021 height = root->ascender + root->descender + face->os2.sTypoLineGap;
1022 if ( height > root->height )
1023 root->height = height;
1024 }
1025 #endif /* 0 */
1026
1027 root->max_advance_width = face->horizontal.advance_Width_Max;
1028 root->max_advance_height = (FT_Short)( face->vertical_info
1029 ? face->vertical.advance_Height_Max
1030 : root->height );
1031
1032 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
1033 /* Adjust underline position from top edge to centre of */
1034 /* stroke to convert TrueType meaning to FreeType meaning. */
1035 root->underline_position = face->postscript.underlinePosition -
1036 face->postscript.underlineThickness / 2;
1037 root->underline_thickness = face->postscript.underlineThickness;
1038 }
1039
1040 }
1041
1042 Exit:
1043 FT_TRACE2(( "sfnt_load_face: done\n" ));
1044
1045 return error;
1046 }
1047
1048
1049 #undef LOAD_
1050 #undef LOADM_
1051 #undef GET_NAME
1052
1053
1054 FT_LOCAL_DEF( void )
1055 sfnt_done_face( TT_Face face )
1056 {
1057 FT_Memory memory;
1058 SFNT_Service sfnt;
1059
1060
1061 if ( !face )
1062 return;
1063
1064 memory = face->root.memory;
1065 sfnt = (SFNT_Service)face->sfnt;
1066
1067 if ( sfnt )
1068 {
1069 /* destroy the postscript names table if it is loaded */
1070 if ( sfnt->free_psnames )
1071 sfnt->free_psnames( face );
1072
1073 /* destroy the embedded bitmaps table if it is loaded */
1074 if ( sfnt->free_eblc )
1075 sfnt->free_eblc( face );
1076 }
1077
1078 #ifdef TT_CONFIG_OPTION_BDF
1079 /* freeing the embedded BDF properties */
1080 tt_face_free_bdf_props( face );
1081 #endif
1082
1083 /* freeing the kerning table */
1084 tt_face_done_kern( face );
1085
1086 /* freeing the collection table */
1087 FT_FREE( face->ttc_header.offsets );
1088 face->ttc_header.count = 0;
1089
1090 /* freeing table directory */
1091 FT_FREE( face->dir_tables );
1092 face->num_tables = 0;
1093
1094 {
1095 FT_Stream stream = FT_FACE_STREAM( face );
1096
1097
1098 /* simply release the 'cmap' table frame */
1099 FT_FRAME_RELEASE( face->cmap_table );
1100 face->cmap_size = 0;
1101 }
1102
1103 /* freeing the horizontal metrics */
1104 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
1105 {
1106 FT_Stream stream = FT_FACE_STREAM( face );
1107
1108
1109 FT_FRAME_RELEASE( face->horz_metrics );
1110 FT_FRAME_RELEASE( face->vert_metrics );
1111 face->horz_metrics_size = 0;
1112 face->vert_metrics_size = 0;
1113 }
1114 #else
1115 FT_FREE( face->horizontal.long_metrics );
1116 FT_FREE( face->horizontal.short_metrics );
1117 #endif
1118
1119 /* freeing the vertical ones, if any */
1120 if ( face->vertical_info )
1121 {
1122 FT_FREE( face->vertical.long_metrics );
1123 FT_FREE( face->vertical.short_metrics );
1124 face->vertical_info = 0;
1125 }
1126
1127 /* freeing the gasp table */
1128 FT_FREE( face->gasp.gaspRanges );
1129 face->gasp.numRanges = 0;
1130
1131 /* freeing the name table */
1132 if ( sfnt )
1133 sfnt->free_name( face );
1134
1135 /* freeing family and style name */
1136 FT_FREE( face->root.family_name );
1137 FT_FREE( face->root.style_name );
1138
1139 /* freeing sbit size table */
1140 FT_FREE( face->root.available_sizes );
1141 face->root.num_fixed_sizes = 0;
1142
1143 FT_FREE( face->postscript_name );
1144
1145 face->sfnt = 0;
1146 }
1147
1148
1149 /* END */
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