1
/***************************************************************************/
5
/* SFNT object management (base). */
7
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2010 by */
8
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16
/***************************************************************************/
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
32
#ifdef TT_CONFIG_OPTION_BDF
37
/*************************************************************************/
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. */
44
#define FT_COMPONENT trace_sfobjs
48
/* convert a UTF-16 name entry to ASCII */
50
tt_name_entry_ascii_from_utf16( TT_NameEntry entry,
53
FT_String* string = NULL;
55
FT_Byte* read = (FT_Byte*)entry->string;
59
len = (FT_UInt)entry->stringLength / 2;
61
if ( FT_NEW_ARRAY( string, len + 1 ) )
64
for ( n = 0; n < len; n++ )
66
code = FT_NEXT_USHORT( read );
67
if ( code < 32 || code > 127 )
70
string[n] = (char)code;
79
/* convert an Apple Roman or symbol name entry to ASCII */
81
tt_name_entry_ascii_from_other( TT_NameEntry entry,
84
FT_String* string = NULL;
86
FT_Byte* read = (FT_Byte*)entry->string;
90
len = (FT_UInt)entry->stringLength;
92
if ( FT_NEW_ARRAY( string, len + 1 ) )
95
for ( n = 0; n < len; n++ )
98
if ( code < 32 || code > 127 )
101
string[n] = (char)code;
110
typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry,
114
/*************************************************************************/
117
/* tt_face_get_name */
120
/* Returns a given ENGLISH name record in ASCII. */
123
/* face :: A handle to the source face object. */
125
/* nameid :: The name id of the name record to return. */
128
/* name :: The address of a string pointer. NULL if no name is */
132
/* FreeType error code. 0 means success. */
135
tt_face_get_name( TT_Face face,
139
FT_Memory memory = face->root.memory;
140
FT_Error error = SFNT_Err_Ok;
141
FT_String* result = NULL;
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;
150
FT_Bool is_english = 0;
152
TT_NameEntry_ConvertFunc convert;
157
rec = face->name_table.names;
158
for ( n = 0; n < face->num_names; n++, rec++ )
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. */
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). */
169
if ( rec->nameID == nameid && rec->stringLength > 0 )
171
switch ( rec->platformID )
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 */
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. */
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;
193
case TT_PLATFORM_MICROSOFT:
194
/* we only take a non-English name when there is nothing */
195
/* else available in the font */
197
if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 )
199
switch ( rec->encodingID )
201
case TT_MS_ID_SYMBOL_CS:
202
case TT_MS_ID_UNICODE_CS:
204
is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 );
220
found_apple = found_apple_roman;
221
if ( found_apple_english >= 0 )
222
found_apple = found_apple_english;
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) */
229
if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) )
231
rec = face->name_table.names + found_win;
232
switch ( rec->encodingID )
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;
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 */
246
convert = tt_name_entry_ascii_from_utf16;
253
else if ( found_apple >= 0 )
255
rec = face->name_table.names + found_apple;
256
convert = tt_name_entry_ascii_from_other;
258
else if ( found_unicode >= 0 )
260
rec = face->name_table.names + found_unicode;
261
convert = tt_name_entry_ascii_from_utf16;
264
if ( rec && convert )
266
if ( rec->string == NULL )
268
FT_Stream stream = face->name_table.stream;
271
if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) ||
272
FT_STREAM_SEEK( rec->stringOffset ) ||
273
FT_STREAM_READ( rec->string, rec->stringLength ) )
275
FT_FREE( rec->string );
276
rec->stringLength = 0;
282
result = convert( rec, memory );
292
sfnt_find_encoding( int platform_id,
295
typedef struct TEncoding_
299
FT_Encoding encoding;
304
const TEncoding tt_encodings[] =
306
{ TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE },
308
{ TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE },
310
{ TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN },
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 }
322
const TEncoding *cur, *limit;
326
limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );
328
for ( ; cur < limit; cur++ )
330
if ( cur->platform_id == platform_id )
332
if ( cur->encoding_id == encoding_id ||
333
cur->encoding_id == -1 )
334
return cur->encoding;
338
return FT_ENCODING_NONE;
342
/* Fill in face->ttc_header. If the font is not a TTC, it is */
343
/* synthesized into a TTC with one offset table. */
345
sfnt_open_font( FT_Stream stream,
348
FT_Memory memory = stream->memory;
350
FT_ULong tag, offset;
352
static const FT_Frame_Field ttc_header_fields[] =
355
#define FT_STRUCTURE TTC_HeaderRec
358
FT_FRAME_LONG( version ),
359
FT_FRAME_LONG( count ),
364
face->ttc_header.tag = 0;
365
face->ttc_header.version = 0;
366
face->ttc_header.count = 0;
368
offset = FT_STREAM_POS();
370
if ( FT_READ_ULONG( tag ) )
373
if ( tag != 0x00010000UL &&
378
tag != 0x00020000UL )
379
return SFNT_Err_Unknown_File_Format;
381
face->ttc_header.tag = TTAG_ttcf;
383
if ( tag == TTAG_ttcf )
388
FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
390
if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
393
/* now read the offsets of each font in the file */
394
if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
397
if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
400
for ( n = 0; n < face->ttc_header.count; n++ )
401
face->ttc_header.offsets[n] = FT_GET_ULONG();
407
FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
409
face->ttc_header.version = 1 << 16;
410
face->ttc_header.count = 1;
412
if ( FT_NEW( face->ttc_header.offsets ) )
415
face->ttc_header.offsets[0] = offset;
422
FT_LOCAL_DEF( FT_Error )
423
sfnt_init_face( FT_Stream stream,
427
FT_Parameter* params )
430
FT_Library library = face->root.driver->root.library;
434
/* for now, parameters are unused */
435
FT_UNUSED( num_params );
439
sfnt = (SFNT_Service)face->sfnt;
442
sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
444
return SFNT_Err_Invalid_File_Format;
447
face->goto_table = sfnt->goto_table;
450
FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
452
error = sfnt_open_font( stream, face );
456
FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
458
if ( face_index < 0 )
461
if ( face_index >= face->ttc_header.count )
462
return SFNT_Err_Invalid_Argument;
464
if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
467
/* check that we have a valid TrueType file */
468
error = sfnt->load_font_dir( face, stream );
472
face->root.num_faces = face->ttc_header.count;
473
face->root.face_index = face_index;
481
FT_TRACE2(( "`" #x "' " )); \
482
FT_TRACE3(( "-->\n" )); \
484
error = sfnt->load_##x( face, stream ); \
486
FT_TRACE2(( "%s\n", ( !error ) \
488
: ( error == SFNT_Err_Table_Missing ) \
490
: "failed to load" )); \
491
FT_TRACE3(( "\n" )); \
494
#define LOADM_( x, vertical ) \
496
FT_TRACE2(( "`%s" #x "' ", \
497
vertical ? "vertical " : "" )); \
498
FT_TRACE3(( "-->\n" )); \
500
error = sfnt->load_##x( face, stream, vertical ); \
502
FT_TRACE2(( "%s\n", ( !error ) \
504
: ( error == SFNT_Err_Table_Missing ) \
506
: "failed to load" )); \
507
FT_TRACE3(( "\n" )); \
510
#define GET_NAME( id, field ) \
512
error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \
518
FT_LOCAL_DEF( FT_Error )
519
sfnt_load_face( FT_Stream stream,
523
FT_Parameter* params )
526
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
527
FT_Error psnames_error;
530
FT_Bool is_apple_sbit;
531
FT_Bool ignore_preferred_family = FALSE;
532
FT_Bool ignore_preferred_subfamily = FALSE;
534
SFNT_Service sfnt = (SFNT_Service)face->sfnt;
536
FT_UNUSED( face_index );
538
/* Check parameters */
544
for ( i = 0; i < num_params; i++ )
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;
555
/* We now support two SFNT-based bitmapped font formats. They */
556
/* are recognized easily as they do not include a `glyf' */
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 */
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. */
570
FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
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 );
578
has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
579
tt_face_lookup_table( face, TTAG_CFF ) != 0 );
584
/* if this font doesn't contain outlines, we try to load */
586
if ( !has_outline && sfnt->load_bhed )
589
is_apple_sbit = FT_BOOL( !error );
592
/* load the font header (`head' table) if this isn't an Apple */
594
if ( !is_apple_sbit )
601
if ( face->header.Units_Per_EM == 0 )
603
error = SFNT_Err_Invalid_Table;
608
/* the following tables are often not present in embedded TrueType */
609
/* fonts within PDF documents, so don't check for them. */
613
/* the following tables are optional in PCL fonts -- */
614
/* don't check for errors */
618
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
619
psnames_error = error;
622
/* do not load the metrics headers and tables if this is an Apple */
624
if ( !is_apple_sbit )
626
/* load the `hhea' and `hmtx' tables */
631
if ( error == SFNT_Err_Table_Missing )
633
error = SFNT_Err_Hmtx_Table_Missing;
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->
642
face->horizontal.number_Of_HMetrics = 0;
648
else if ( error == SFNT_Err_Table_Missing )
650
/* No `hhea' table necessary for SFNT Mac fonts. */
651
if ( face->format_tag == TTAG_true )
653
FT_TRACE2(( "This is an SFNT Mac font.\n" ));
659
error = SFNT_Err_Horiz_Header_Missing;
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->
668
face->horizontal.number_Of_HMetrics = 0;
679
/* try to load the `vhea' and `vmtx' tables */
685
face->vertical_info = 1;
688
if ( error && error != SFNT_Err_Table_Missing )
694
/* we treat the table as missing if there are any errors */
695
face->os2.version = 0xFFFFU;
699
/* the optional tables */
701
/* embedded bitmap support */
702
if ( sfnt->load_eblc )
707
/* a font which contains neither bitmaps nor outlines is */
708
/* still valid (although rather useless in most cases); */
709
/* however, you can find such stripped fonts in PDFs */
710
if ( error == SFNT_Err_Table_Missing )
720
if ( error != SFNT_Err_Table_Missing )
723
face->pclt.Version = 0;
726
/* consider the kerning and gasp tables as optional */
730
face->root.num_glyphs = face->max_profile.numGlyphs;
732
/* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */
733
/* a WWS-only font face. `WWS' stands for `weight', width', and */
734
/* `slope', a term used by Microsoft's Windows Presentation */
735
/* Foundation (WPF). This flag has been introduced in version */
736
/* 1.5 of the OpenType specification (May 2008). */
738
face->root.family_name = NULL;
739
face->root.style_name = NULL;
740
if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
742
if ( !ignore_preferred_family )
743
GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
744
if ( !face->root.family_name )
745
GET_NAME( FONT_FAMILY, &face->root.family_name );
747
if ( !ignore_preferred_subfamily )
748
GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
749
if ( !face->root.style_name )
750
GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
754
GET_NAME( WWS_FAMILY, &face->root.family_name );
755
if ( !face->root.family_name && !ignore_preferred_family )
756
GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
757
if ( !face->root.family_name )
758
GET_NAME( FONT_FAMILY, &face->root.family_name );
760
GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
761
if ( !face->root.style_name && !ignore_preferred_subfamily )
762
GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
763
if ( !face->root.style_name )
764
GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
767
/* now set up root fields */
769
FT_Face root = &face->root;
770
FT_Long flags = root->face_flags;
773
/*********************************************************************/
775
/* Compute face flags. */
777
if ( has_outline == TRUE )
778
flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */
780
/* The sfnt driver only supports bitmap fonts natively, thus we */
781
/* don't set FT_FACE_FLAG_HINTER. */
782
flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
783
FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
785
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
786
if ( psnames_error == SFNT_Err_Ok &&
787
face->postscript.FormatType != 0x00030000L )
788
flags |= FT_FACE_FLAG_GLYPH_NAMES;
791
/* fixed width font? */
792
if ( face->postscript.isFixedPitch )
793
flags |= FT_FACE_FLAG_FIXED_WIDTH;
795
/* vertical information? */
796
if ( face->vertical_info )
797
flags |= FT_FACE_FLAG_VERTICAL;
799
/* kerning available ? */
800
if ( TT_FACE_HAS_KERNING( face ) )
801
flags |= FT_FACE_FLAG_KERNING;
803
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
804
/* Don't bother to load the tables unless somebody asks for them. */
805
/* No need to do work which will (probably) not be used. */
806
if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
807
tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
808
tt_face_lookup_table( face, TTAG_gvar ) != 0 )
809
flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
812
root->face_flags = flags;
814
/*********************************************************************/
816
/* Compute style flags. */
820
if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
822
/* We have an OS/2 table; use the `fsSelection' field. Bit 9 */
823
/* indicates an oblique font face. This flag has been */
824
/* introduced in version 1.5 of the OpenType specification. */
826
if ( face->os2.fsSelection & 512 ) /* bit 9 */
827
flags |= FT_STYLE_FLAG_ITALIC;
828
else if ( face->os2.fsSelection & 1 ) /* bit 0 */
829
flags |= FT_STYLE_FLAG_ITALIC;
831
if ( face->os2.fsSelection & 32 ) /* bit 5 */
832
flags |= FT_STYLE_FLAG_BOLD;
836
/* this is an old Mac font, use the header field */
838
if ( face->header.Mac_Style & 1 )
839
flags |= FT_STYLE_FLAG_BOLD;
841
if ( face->header.Mac_Style & 2 )
842
flags |= FT_STYLE_FLAG_ITALIC;
845
root->style_flags = flags;
847
/*********************************************************************/
849
/* Polish the charmaps. */
851
/* Try to set the charmap encoding according to the platform & */
852
/* encoding ID of each charmap. */
855
tt_face_build_cmaps( face ); /* ignore errors */
858
/* set the encoding fields */
863
for ( m = 0; m < root->num_charmaps; m++ )
865
FT_CharMap charmap = root->charmaps[m];
868
charmap->encoding = sfnt_find_encoding( charmap->platform_id,
869
charmap->encoding_id );
872
if ( root->charmap == NULL &&
873
charmap->encoding == FT_ENCODING_UNICODE )
875
/* set 'root->charmap' to the first Unicode encoding we find */
876
root->charmap = charmap;
882
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
885
* Now allocate the root array of FT_Bitmap_Size records and
886
* populate them. Unfortunately, it isn't possible to indicate bit
887
* depths in the FT_Bitmap_Size record. This is a design error.
893
#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
894
count = face->sbit_num_strikes;
896
count = (FT_UInt)face->num_sbit_strikes;
901
FT_Memory memory = face->root.stream->memory;
902
FT_UShort em_size = face->header.Units_Per_EM;
903
FT_Short avgwidth = face->os2.xAvgCharWidth;
904
FT_Size_Metrics metrics;
907
if ( em_size == 0 || face->os2.version == 0xFFFFU )
913
if ( FT_NEW_ARRAY( root->available_sizes, count ) )
916
for ( i = 0; i < count; i++ )
918
FT_Bitmap_Size* bsize = root->available_sizes + i;
921
error = sfnt->load_strike_metrics( face, i, &metrics );
925
bsize->height = (FT_Short)( metrics.height >> 6 );
926
bsize->width = (FT_Short)(
927
( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
929
bsize->x_ppem = metrics.x_ppem << 6;
930
bsize->y_ppem = metrics.y_ppem << 6;
933
bsize->size = metrics.y_ppem << 6;
936
root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
937
root->num_fixed_sizes = (FT_Int)count;
941
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
943
/* a font with no bitmaps and no outlines is scalable; */
944
/* it has only empty glyphs then */
945
if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
946
root->face_flags |= FT_FACE_FLAG_SCALABLE;
949
/*********************************************************************/
951
/* Set up metrics. */
953
if ( FT_IS_SCALABLE( root ) )
955
/* XXX What about if outline header is missing */
956
/* (e.g. sfnt wrapped bitmap)? */
957
root->bbox.xMin = face->header.xMin;
958
root->bbox.yMin = face->header.yMin;
959
root->bbox.xMax = face->header.xMax;
960
root->bbox.yMax = face->header.yMax;
961
root->units_per_EM = face->header.Units_Per_EM;
964
/* XXX: Computing the ascender/descender/height is very different */
965
/* from what the specification tells you. Apparently, we */
966
/* must be careful because */
968
/* - not all fonts have an OS/2 table; in this case, we take */
969
/* the values in the horizontal header. However, these */
970
/* values very often are not reliable. */
972
/* - otherwise, the correct typographic values are in the */
973
/* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
975
/* However, certain fonts have these fields set to 0. */
976
/* Rather, they have usWinAscent & usWinDescent correctly */
977
/* set (but with different values). */
979
/* As an example, Arial Narrow is implemented through four */
980
/* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
982
/* Strangely, all fonts have the same values in their */
983
/* sTypoXXX fields, except ARIALNB which sets them to 0. */
985
/* On the other hand, they all have different */
986
/* usWinAscent/Descent values -- as a conclusion, the OS/2 */
987
/* table cannot be used to compute the text height reliably! */
990
/* The ascender/descender/height are computed from the OS/2 table */
991
/* when found. Otherwise, they're taken from the horizontal */
995
root->ascender = face->horizontal.Ascender;
996
root->descender = face->horizontal.Descender;
998
root->height = (FT_Short)( root->ascender - root->descender +
999
face->horizontal.Line_Gap );
1002
/* if the line_gap is 0, we add an extra 15% to the text height -- */
1003
/* this computation is based on various versions of Times New Roman */
1004
if ( face->horizontal.Line_Gap == 0 )
1005
root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 );
1009
/* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
1010
/* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */
1011
if ( face->os2.version != 0xFFFFU && root->ascender )
1016
root->ascender = face->os2.sTypoAscender;
1017
root->descender = -face->os2.sTypoDescender;
1019
height = root->ascender + root->descender + face->os2.sTypoLineGap;
1020
if ( height > root->height )
1021
root->height = height;
1025
root->max_advance_width = face->horizontal.advance_Width_Max;
1026
root->max_advance_height = (FT_Short)( face->vertical_info
1027
? face->vertical.advance_Height_Max
1030
/* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
1031
/* Adjust underline position from top edge to centre of */
1032
/* stroke to convert TrueType meaning to FreeType meaning. */
1033
root->underline_position = face->postscript.underlinePosition -
1034
face->postscript.underlineThickness / 2;
1035
root->underline_thickness = face->postscript.underlineThickness;
1041
FT_TRACE2(( "sfnt_load_face: done\n" ));
1052
FT_LOCAL_DEF( void )
1053
sfnt_done_face( TT_Face face )
1062
memory = face->root.memory;
1063
sfnt = (SFNT_Service)face->sfnt;
1067
/* destroy the postscript names table if it is loaded */
1068
if ( sfnt->free_psnames )
1069
sfnt->free_psnames( face );
1071
/* destroy the embedded bitmaps table if it is loaded */
1072
if ( sfnt->free_eblc )
1073
sfnt->free_eblc( face );
1076
#ifdef TT_CONFIG_OPTION_BDF
1077
/* freeing the embedded BDF properties */
1078
tt_face_free_bdf_props( face );
1081
/* freeing the kerning table */
1082
tt_face_done_kern( face );
1084
/* freeing the collection table */
1085
FT_FREE( face->ttc_header.offsets );
1086
face->ttc_header.count = 0;
1088
/* freeing table directory */
1089
FT_FREE( face->dir_tables );
1090
face->num_tables = 0;
1093
FT_Stream stream = FT_FACE_STREAM( face );
1096
/* simply release the 'cmap' table frame */
1097
FT_FRAME_RELEASE( face->cmap_table );
1098
face->cmap_size = 0;
1101
/* freeing the horizontal metrics */
1102
#ifndef FT_CONFIG_OPTION_OLD_INTERNALS
1104
FT_Stream stream = FT_FACE_STREAM( face );
1107
FT_FRAME_RELEASE( face->horz_metrics );
1108
FT_FRAME_RELEASE( face->vert_metrics );
1109
face->horz_metrics_size = 0;
1110
face->vert_metrics_size = 0;
1113
FT_FREE( face->horizontal.long_metrics );
1114
FT_FREE( face->horizontal.short_metrics );
1117
/* freeing the vertical ones, if any */
1118
if ( face->vertical_info )
1120
FT_FREE( face->vertical.long_metrics );
1121
FT_FREE( face->vertical.short_metrics );
1122
face->vertical_info = 0;
1125
/* freeing the gasp table */
1126
FT_FREE( face->gasp.gaspRanges );
1127
face->gasp.numRanges = 0;
1129
/* freeing the name table */
1131
sfnt->free_name( face );
1133
/* freeing family and style name */
1134
FT_FREE( face->root.family_name );
1135
FT_FREE( face->root.style_name );
1137
/* freeing sbit size table */
1138
FT_FREE( face->root.available_sizes );
1139
face->root.num_fixed_sizes = 0;
1141
FT_FREE( face->postscript_name );