1 /***************************************************************************/
5 /* SFNT object management (base). */
7 /* Copyright 1996-2008, 2010-2011 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 ), /* this is ULong in the specs */
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 )
380 FT_TRACE2(( " not a font using the SFNT container format\n" ));
381 return SFNT_Err_Unknown_File_Format;
384 face->ttc_header.tag = TTAG_ttcf;
386 if ( tag == TTAG_ttcf )
391 FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
393 if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
396 if ( face->ttc_header.count == 0 )
397 return SFNT_Err_Invalid_Table;
399 /* a rough size estimate: let's conservatively assume that there */
400 /* is just a single table info in each subfont header (12 + 16*1 = */
401 /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */
402 /* size of the TTC header plus `28*count' bytes for all subfont */
404 if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) )
405 return SFNT_Err_Array_Too_Large;
407 /* now read the offsets of each font in the file */
408 if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
411 if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
414 for ( n = 0; n < face->ttc_header.count; n++ )
415 face->ttc_header.offsets[n] = FT_GET_ULONG();
421 FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
423 face->ttc_header.version = 1 << 16;
424 face->ttc_header.count = 1;
426 if ( FT_NEW( face->ttc_header.offsets ) )
429 face->ttc_header.offsets[0] = offset;
436 FT_LOCAL_DEF( FT_Error )
437 sfnt_init_face( FT_Stream stream,
441 FT_Parameter* params )
444 FT_Library library = face->root.driver->root.library;
448 /* for now, parameters are unused */
449 FT_UNUSED( num_params );
453 sfnt = (SFNT_Service)face->sfnt;
456 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
459 FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" ));
460 return SFNT_Err_Missing_Module;
464 face->goto_table = sfnt->goto_table;
467 FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
469 FT_TRACE2(( "SFNT driver\n" ));
471 error = sfnt_open_font( stream, face );
475 FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
477 if ( face_index < 0 )
480 if ( face_index >= face->ttc_header.count )
481 return SFNT_Err_Invalid_Argument;
483 if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
486 /* check that we have a valid TrueType file */
487 error = sfnt->load_font_dir( face, stream );
491 face->root.num_faces = face->ttc_header.count;
492 face->root.face_index = face_index;
500 FT_TRACE2(( "`" #x "' " )); \
501 FT_TRACE3(( "-->\n" )); \
503 error = sfnt->load_##x( face, stream ); \
505 FT_TRACE2(( "%s\n", ( !error ) \
507 : ( error == SFNT_Err_Table_Missing ) \
509 : "failed to load" )); \
510 FT_TRACE3(( "\n" )); \
513 #define LOADM_( x, vertical ) \
515 FT_TRACE2(( "`%s" #x "' ", \
516 vertical ? "vertical " : "" )); \
517 FT_TRACE3(( "-->\n" )); \
519 error = sfnt->load_##x( face, stream, vertical ); \
521 FT_TRACE2(( "%s\n", ( !error ) \
523 : ( error == SFNT_Err_Table_Missing ) \
525 : "failed to load" )); \
526 FT_TRACE3(( "\n" )); \
529 #define GET_NAME( id, field ) \
531 error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \
537 FT_LOCAL_DEF( FT_Error )
538 sfnt_load_face( FT_Stream stream,
542 FT_Parameter* params )
545 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
546 FT_Error psnames_error;
549 FT_Bool is_apple_sbit;
550 FT_Bool ignore_preferred_family = FALSE;
551 FT_Bool ignore_preferred_subfamily = FALSE;
553 SFNT_Service sfnt = (SFNT_Service)face->sfnt;
555 FT_UNUSED( face_index );
557 /* Check parameters */
563 for ( i = 0; i < num_params; i++ )
565 if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY )
566 ignore_preferred_family = TRUE;
567 else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY )
568 ignore_preferred_subfamily = TRUE;
574 /* We now support two SFNT-based bitmapped font formats. They */
575 /* are recognized easily as they do not include a `glyf' */
578 /* The first format comes from Apple, and uses a table named */
579 /* `bhed' instead of `head' to store the font header (using */
580 /* the same format). It also doesn't include horizontal and */
581 /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */
584 /* The other format comes from Microsoft, and is used with */
585 /* WinCE/PocketPC. It looks like a standard TTF, except that */
586 /* it doesn't contain outlines. */
589 FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
591 /* do we have outlines in there? */
592 #ifdef FT_CONFIG_OPTION_INCREMENTAL
593 has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 ||
594 tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
595 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
597 has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
598 tt_face_lookup_table( face, TTAG_CFF ) != 0 );
603 /* if this font doesn't contain outlines, we try to load */
605 if ( !has_outline && sfnt->load_bhed )
608 is_apple_sbit = FT_BOOL( !error );
611 /* load the font header (`head' table) if this isn't an Apple */
613 if ( !is_apple_sbit )
620 if ( face->header.Units_Per_EM == 0 )
622 error = SFNT_Err_Invalid_Table;
627 /* the following tables are often not present in embedded TrueType */
628 /* fonts within PDF documents, so don't check for them. */
632 /* the following tables are optional in PCL fonts -- */
633 /* don't check for errors */
637 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
638 psnames_error = error;
641 /* do not load the metrics headers and tables if this is an Apple */
643 if ( !is_apple_sbit )
645 /* load the `hhea' and `hmtx' tables */
650 if ( error == SFNT_Err_Table_Missing )
652 error = SFNT_Err_Hmtx_Table_Missing;
654 #ifdef FT_CONFIG_OPTION_INCREMENTAL
655 /* If this is an incrementally loaded font and there are */
656 /* overriding metrics, tolerate a missing `hmtx' table. */
657 if ( face->root.internal->incremental_interface &&
658 face->root.internal->incremental_interface->funcs->
661 face->horizontal.number_Of_HMetrics = 0;
667 else if ( error == SFNT_Err_Table_Missing )
669 /* No `hhea' table necessary for SFNT Mac fonts. */
670 if ( face->format_tag == TTAG_true )
672 FT_TRACE2(( "This is an SFNT Mac font.\n" ));
679 error = SFNT_Err_Horiz_Header_Missing;
681 #ifdef FT_CONFIG_OPTION_INCREMENTAL
682 /* If this is an incrementally loaded font and there are */
683 /* overriding metrics, tolerate a missing `hhea' table. */
684 if ( face->root.internal->incremental_interface &&
685 face->root.internal->incremental_interface->funcs->
688 face->horizontal.number_Of_HMetrics = 0;
699 /* try to load the `vhea' and `vmtx' tables */
705 face->vertical_info = 1;
708 if ( error && error != SFNT_Err_Table_Missing )
714 /* we treat the table as missing if there are any errors */
715 face->os2.version = 0xFFFFU;
719 /* the optional tables */
721 /* embedded bitmap support */
722 if ( sfnt->load_eblc )
727 /* a font which contains neither bitmaps nor outlines is */
728 /* still valid (although rather useless in most cases); */
729 /* however, you can find such stripped fonts in PDFs */
730 if ( error == SFNT_Err_Table_Missing )
740 if ( error != SFNT_Err_Table_Missing )
743 face->pclt.Version = 0;
746 /* consider the kerning and gasp tables as optional */
750 face->root.num_glyphs = face->max_profile.numGlyphs;
752 /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */
753 /* a WWS-only font face. `WWS' stands for `weight', width', and */
754 /* `slope', a term used by Microsoft's Windows Presentation */
755 /* Foundation (WPF). This flag has been introduced in version */
756 /* 1.5 of the OpenType specification (May 2008). */
758 face->root.family_name = NULL;
759 face->root.style_name = NULL;
760 if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
762 if ( !ignore_preferred_family )
763 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
764 if ( !face->root.family_name )
765 GET_NAME( FONT_FAMILY, &face->root.family_name );
767 if ( !ignore_preferred_subfamily )
768 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
769 if ( !face->root.style_name )
770 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
774 GET_NAME( WWS_FAMILY, &face->root.family_name );
775 if ( !face->root.family_name && !ignore_preferred_family )
776 GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
777 if ( !face->root.family_name )
778 GET_NAME( FONT_FAMILY, &face->root.family_name );
780 GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
781 if ( !face->root.style_name && !ignore_preferred_subfamily )
782 GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
783 if ( !face->root.style_name )
784 GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
787 /* now set up root fields */
789 FT_Face root = &face->root;
790 FT_Long flags = root->face_flags;
793 /*********************************************************************/
795 /* Compute face flags. */
797 if ( has_outline == TRUE )
798 flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */
800 /* The sfnt driver only supports bitmap fonts natively, thus we */
801 /* don't set FT_FACE_FLAG_HINTER. */
802 flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
803 FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
805 #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
806 if ( psnames_error == SFNT_Err_Ok &&
807 face->postscript.FormatType != 0x00030000L )
808 flags |= FT_FACE_FLAG_GLYPH_NAMES;
811 /* fixed width font? */
812 if ( face->postscript.isFixedPitch )
813 flags |= FT_FACE_FLAG_FIXED_WIDTH;
815 /* vertical information? */
816 if ( face->vertical_info )
817 flags |= FT_FACE_FLAG_VERTICAL;
819 /* kerning available ? */
820 if ( TT_FACE_HAS_KERNING( face ) )
821 flags |= FT_FACE_FLAG_KERNING;
823 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
824 /* Don't bother to load the tables unless somebody asks for them. */
825 /* No need to do work which will (probably) not be used. */
826 if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
827 tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
828 tt_face_lookup_table( face, TTAG_gvar ) != 0 )
829 flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
832 root->face_flags = flags;
834 /*********************************************************************/
836 /* Compute style flags. */
840 if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
842 /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */
843 /* indicates an oblique font face. This flag has been */
844 /* introduced in version 1.5 of the OpenType specification. */
846 if ( face->os2.fsSelection & 512 ) /* bit 9 */
847 flags |= FT_STYLE_FLAG_ITALIC;
848 else if ( face->os2.fsSelection & 1 ) /* bit 0 */
849 flags |= FT_STYLE_FLAG_ITALIC;
851 if ( face->os2.fsSelection & 32 ) /* bit 5 */
852 flags |= FT_STYLE_FLAG_BOLD;
856 /* this is an old Mac font, use the header field */
858 if ( face->header.Mac_Style & 1 )
859 flags |= FT_STYLE_FLAG_BOLD;
861 if ( face->header.Mac_Style & 2 )
862 flags |= FT_STYLE_FLAG_ITALIC;
865 root->style_flags = flags;
867 /*********************************************************************/
869 /* Polish the charmaps. */
871 /* Try to set the charmap encoding according to the platform & */
872 /* encoding ID of each charmap. */
875 tt_face_build_cmaps( face ); /* ignore errors */
878 /* set the encoding fields */
883 for ( m = 0; m < root->num_charmaps; m++ )
885 FT_CharMap charmap = root->charmaps[m];
888 charmap->encoding = sfnt_find_encoding( charmap->platform_id,
889 charmap->encoding_id );
892 if ( root->charmap == NULL &&
893 charmap->encoding == FT_ENCODING_UNICODE )
895 /* set 'root->charmap' to the first Unicode encoding we find */
896 root->charmap = charmap;
902 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
905 * Now allocate the root array of FT_Bitmap_Size records and
906 * populate them. Unfortunately, it isn't possible to indicate bit
907 * depths in the FT_Bitmap_Size record. This is a design error.
913 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
914 count = face->sbit_num_strikes;
916 count = (FT_UInt)face->num_sbit_strikes;
921 FT_Memory memory = face->root.stream->memory;
922 FT_UShort em_size = face->header.Units_Per_EM;
923 FT_Short avgwidth = face->os2.xAvgCharWidth;
924 FT_Size_Metrics metrics;
927 if ( em_size == 0 || face->os2.version == 0xFFFFU )
933 if ( FT_NEW_ARRAY( root->available_sizes, count ) )
936 for ( i = 0; i < count; i++ )
938 FT_Bitmap_Size* bsize = root->available_sizes + i;
941 error = sfnt->load_strike_metrics( face, i, &metrics );
945 bsize->height = (FT_Short)( metrics.height >> 6 );
946 bsize->width = (FT_Short)(
947 ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
949 bsize->x_ppem = metrics.x_ppem << 6;
950 bsize->y_ppem = metrics.y_ppem << 6;
953 bsize->size = metrics.y_ppem << 6;
956 root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
957 root->num_fixed_sizes = (FT_Int)count;
961 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
963 /* a font with no bitmaps and no outlines is scalable; */
964 /* it has only empty glyphs then */
965 if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
966 root->face_flags |= FT_FACE_FLAG_SCALABLE;
969 /*********************************************************************/
971 /* Set up metrics. */
973 if ( FT_IS_SCALABLE( root ) )
975 /* XXX What about if outline header is missing */
976 /* (e.g. sfnt wrapped bitmap)? */
977 root->bbox.xMin = face->header.xMin;
978 root->bbox.yMin = face->header.yMin;
979 root->bbox.xMax = face->header.xMax;
980 root->bbox.yMax = face->header.yMax;
981 root->units_per_EM = face->header.Units_Per_EM;
984 /* XXX: Computing the ascender/descender/height is very different */
985 /* from what the specification tells you. Apparently, we */
986 /* must be careful because */
988 /* - not all fonts have an OS/2 table; in this case, we take */
989 /* the values in the horizontal header. However, these */
990 /* values very often are not reliable. */
992 /* - otherwise, the correct typographic values are in the */
993 /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
995 /* However, certain fonts have these fields set to 0. */
996 /* Rather, they have usWinAscent & usWinDescent correctly */
997 /* set (but with different values). */
999 /* As an example, Arial Narrow is implemented through four */
1000 /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
1002 /* Strangely, all fonts have the same values in their */
1003 /* sTypoXXX fields, except ARIALNB which sets them to 0. */
1005 /* On the other hand, they all have different */
1006 /* usWinAscent/Descent values -- as a conclusion, the OS/2 */
1007 /* table cannot be used to compute the text height reliably! */
1010 /* The ascender and descender are taken from the `hhea' table. */
1011 /* If zero, they are taken from the `OS/2' table. */
1013 root->ascender = face->horizontal.Ascender;
1014 root->descender = face->horizontal.Descender;
1016 root->height = (FT_Short)( root->ascender - root->descender +
1017 face->horizontal.Line_Gap );
1019 if ( !( root->ascender || root->descender ) )
1021 if ( face->os2.version != 0xFFFFU )
1023 if ( face->os2.sTypoAscender || face->os2.sTypoDescender )
1025 root->ascender = face->os2.sTypoAscender;
1026 root->descender = face->os2.sTypoDescender;
1028 root->height = (FT_Short)( root->ascender - root->descender +
1029 face->os2.sTypoLineGap );
1033 root->ascender = (FT_Short)face->os2.usWinAscent;
1034 root->descender = -(FT_Short)face->os2.usWinDescent;
1036 root->height = (FT_UShort)( root->ascender - root->descender );
1041 root->max_advance_width = face->horizontal.advance_Width_Max;
1042 root->max_advance_height = (FT_Short)( face->vertical_info
1043 ? face->vertical.advance_Height_Max
1046 /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
1047 /* Adjust underline position from top edge to centre of */
1048 /* stroke to convert TrueType meaning to FreeType meaning. */
1049 root->underline_position = face->postscript.underlinePosition -
1050 face->postscript.underlineThickness / 2;
1051 root->underline_thickness = face->postscript.underlineThickness;
1057 FT_TRACE2(( "sfnt_load_face: done\n" ));
1068 FT_LOCAL_DEF( void )
1069 sfnt_done_face( TT_Face face )
1078 memory = face->root.memory;
1079 sfnt = (SFNT_Service)face->sfnt;
1083 /* destroy the postscript names table if it is loaded */
1084 if ( sfnt->free_psnames )
1085 sfnt->free_psnames( face );
1087 /* destroy the embedded bitmaps table if it is loaded */
1088 if ( sfnt->free_eblc )
1089 sfnt->free_eblc( face );
1092 #ifdef TT_CONFIG_OPTION_BDF
1093 /* freeing the embedded BDF properties */
1094 tt_face_free_bdf_props( face );
1097 /* freeing the kerning table */
1098 tt_face_done_kern( face );
1100 /* freeing the collection table */
1101 FT_FREE( face->ttc_header.offsets );
1102 face->ttc_header.count = 0;
1104 /* freeing table directory */
1105 FT_FREE( face->dir_tables );
1106 face->num_tables = 0;
1109 FT_Stream stream = FT_FACE_STREAM( face );
1112 /* simply release the 'cmap' table frame */
1113 FT_FRAME_RELEASE( face->cmap_table );
1114 face->cmap_size = 0;
1117 /* freeing the horizontal metrics */
1118 #ifndef FT_CONFIG_OPTION_OLD_INTERNALS
1120 FT_Stream stream = FT_FACE_STREAM( face );
1123 FT_FRAME_RELEASE( face->horz_metrics );
1124 FT_FRAME_RELEASE( face->vert_metrics );
1125 face->horz_metrics_size = 0;
1126 face->vert_metrics_size = 0;
1129 FT_FREE( face->horizontal.long_metrics );
1130 FT_FREE( face->horizontal.short_metrics );
1133 /* freeing the vertical ones, if any */
1134 if ( face->vertical_info )
1136 FT_FREE( face->vertical.long_metrics );
1137 FT_FREE( face->vertical.short_metrics );
1138 face->vertical_info = 0;
1141 /* freeing the gasp table */
1142 FT_FREE( face->gasp.gaspRanges );
1143 face->gasp.numRanges = 0;
1145 /* freeing the name table */
1147 sfnt->free_name( face );
1149 /* freeing family and style name */
1150 FT_FREE( face->root.family_name );
1151 FT_FREE( face->root.style_name );
1153 /* freeing sbit size table */
1154 FT_FREE( face->root.available_sizes );
1155 face->root.num_fixed_sizes = 0;
1157 FT_FREE( face->postscript_name );