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sfobjs.c

Last change on this file was 2, checked in by jglee, 11 years ago
first commit
File size: 37.5 KB

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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_Int32 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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source: svn/trunk/zasc/freetype-2.3.9/sfobjs.c

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