Edit
kc3-lang/freetype/src/sfnt/sfobjs.c
Werner Lemberg
- src/sfnt/sfobjs.c
-
/***************************************************************************/ /* */ /* sfobjs.c */ /* */ /* SFNT object management (base). */ /* */ /* Copyright 1996-2008, 2010-2011 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include "sfobjs.h" #include "ttload.h" #include "ttcmap.h" #include "ttkern.h" #include FT_INTERNAL_SFNT_H #include FT_INTERNAL_DEBUG_H #include FT_TRUETYPE_IDS_H #include FT_TRUETYPE_TAGS_H #include FT_SERVICE_POSTSCRIPT_CMAPS_H #include FT_SFNT_NAMES_H #include "sferrors.h" #ifdef TT_CONFIG_OPTION_BDF #include "ttbdf.h" #endif /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_sfobjs /* convert a UTF-16 name entry to ASCII */ static FT_String* tt_name_entry_ascii_from_utf16( TT_NameEntry entry, FT_Memory memory ) { FT_String* string = NULL; FT_UInt len, code, n; FT_Byte* read = (FT_Byte*)entry->string; FT_Error error; len = (FT_UInt)entry->stringLength / 2; if ( FT_NEW_ARRAY( string, len + 1 ) ) return NULL; for ( n = 0; n < len; n++ ) { code = FT_NEXT_USHORT( read ); if ( code < 32 || code > 127 ) code = '?'; string[n] = (char)code; } string[len] = 0; return string; } /* convert an Apple Roman or symbol name entry to ASCII */ static FT_String* tt_name_entry_ascii_from_other( TT_NameEntry entry, FT_Memory memory ) { FT_String* string = NULL; FT_UInt len, code, n; FT_Byte* read = (FT_Byte*)entry->string; FT_Error error; len = (FT_UInt)entry->stringLength; if ( FT_NEW_ARRAY( string, len + 1 ) ) return NULL; for ( n = 0; n < len; n++ ) { code = *read++; if ( code < 32 || code > 127 ) code = '?'; string[n] = (char)code; } string[len] = 0; return string; } typedef FT_String* (*TT_NameEntry_ConvertFunc)( TT_NameEntry entry, FT_Memory memory ); /*************************************************************************/ /* */ /* <Function> */ /* tt_face_get_name */ /* */ /* <Description> */ /* Returns a given ENGLISH name record in ASCII. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* nameid :: The name id of the name record to return. */ /* */ /* <InOut> */ /* name :: The address of a string pointer. NULL if no name is */ /* present. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ static FT_Error tt_face_get_name( TT_Face face, FT_UShort nameid, FT_String** name ) { FT_Memory memory = face->root.memory; FT_Error error = SFNT_Err_Ok; FT_String* result = NULL; FT_UShort n; TT_NameEntryRec* rec; FT_Int found_apple = -1; FT_Int found_apple_roman = -1; FT_Int found_apple_english = -1; FT_Int found_win = -1; FT_Int found_unicode = -1; FT_Bool is_english = 0; TT_NameEntry_ConvertFunc convert; FT_ASSERT( name ); rec = face->name_table.names; for ( n = 0; n < face->num_names; n++, rec++ ) { /* According to the OpenType 1.3 specification, only Microsoft or */ /* Apple platform IDs might be used in the `name' table. The */ /* `Unicode' platform is reserved for the `cmap' table, and the */ /* `ISO' one is deprecated. */ /* */ /* However, the Apple TrueType specification doesn't say the same */ /* thing and goes to suggest that all Unicode `name' table entries */ /* should be coded in UTF-16 (in big-endian format I suppose). */ /* */ if ( rec->nameID == nameid && rec->stringLength > 0 ) { switch ( rec->platformID ) { case TT_PLATFORM_APPLE_UNICODE: case TT_PLATFORM_ISO: /* there is `languageID' to check there. We should use this */ /* field only as a last solution when nothing else is */ /* available. */ /* */ found_unicode = n; break; case TT_PLATFORM_MACINTOSH: /* This is a bit special because some fonts will use either */ /* an English language id, or a Roman encoding id, to indicate */ /* the English version of its font name. */ /* */ if ( rec->languageID == TT_MAC_LANGID_ENGLISH ) found_apple_english = n; else if ( rec->encodingID == TT_MAC_ID_ROMAN ) found_apple_roman = n; break; case TT_PLATFORM_MICROSOFT: /* we only take a non-English name when there is nothing */ /* else available in the font */ /* */ if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 ) { switch ( rec->encodingID ) { case TT_MS_ID_SYMBOL_CS: case TT_MS_ID_UNICODE_CS: case TT_MS_ID_UCS_4: is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 ); found_win = n; break; default: ; } } break; default: ; } } } found_apple = found_apple_roman; if ( found_apple_english >= 0 ) found_apple = found_apple_english; /* some fonts contain invalid Unicode or Macintosh formatted entries; */ /* we will thus favor names encoded in Windows formats if available */ /* (provided it is an English name) */ /* */ convert = NULL; if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) ) { rec = face->name_table.names + found_win; switch ( rec->encodingID ) { /* all Unicode strings are encoded using UTF-16BE */ case TT_MS_ID_UNICODE_CS: case TT_MS_ID_SYMBOL_CS: convert = tt_name_entry_ascii_from_utf16; break; case TT_MS_ID_UCS_4: /* Apparently, if this value is found in a name table entry, it is */ /* documented as `full Unicode repertoire'. Experience with the */ /* MsGothic font shipped with Windows Vista shows that this really */ /* means UTF-16 encoded names (UCS-4 values are only used within */ /* charmaps). */ convert = tt_name_entry_ascii_from_utf16; break; default: ; } } else if ( found_apple >= 0 ) { rec = face->name_table.names + found_apple; convert = tt_name_entry_ascii_from_other; } else if ( found_unicode >= 0 ) { rec = face->name_table.names + found_unicode; convert = tt_name_entry_ascii_from_utf16; } if ( rec && convert ) { if ( rec->string == NULL ) { FT_Stream stream = face->name_table.stream; if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) || FT_STREAM_SEEK( rec->stringOffset ) || FT_STREAM_READ( rec->string, rec->stringLength ) ) { FT_FREE( rec->string ); rec->stringLength = 0; result = NULL; goto Exit; } } result = convert( rec, memory ); } Exit: *name = result; return error; } static FT_Encoding sfnt_find_encoding( int platform_id, int encoding_id ) { typedef struct TEncoding_ { int platform_id; int encoding_id; FT_Encoding encoding; } TEncoding; static const TEncoding tt_encodings[] = { { TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE }, { TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE }, { TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, FT_ENCODING_GB2312 }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG }, { TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB } }; const TEncoding *cur, *limit; cur = tt_encodings; limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] ); for ( ; cur < limit; cur++ ) { if ( cur->platform_id == platform_id ) { if ( cur->encoding_id == encoding_id || cur->encoding_id == -1 ) return cur->encoding; } } return FT_ENCODING_NONE; } /* Fill in face->ttc_header. If the font is not a TTC, it is */ /* synthesized into a TTC with one offset table. */ static FT_Error sfnt_open_font( FT_Stream stream, TT_Face face ) { FT_Memory memory = stream->memory; FT_Error error; FT_ULong tag, offset; static const FT_Frame_Field ttc_header_fields[] = { #undef FT_STRUCTURE #define FT_STRUCTURE TTC_HeaderRec FT_FRAME_START( 8 ), FT_FRAME_LONG( version ), FT_FRAME_LONG( count ), /* this is ULong in the specs */ FT_FRAME_END }; face->ttc_header.tag = 0; face->ttc_header.version = 0; face->ttc_header.count = 0; offset = FT_STREAM_POS(); if ( FT_READ_ULONG( tag ) ) return error; if ( tag != 0x00010000UL && tag != TTAG_ttcf && tag != TTAG_OTTO && tag != TTAG_true && tag != TTAG_typ1 && tag != 0x00020000UL ) return SFNT_Err_Unknown_File_Format; face->ttc_header.tag = TTAG_ttcf; if ( tag == TTAG_ttcf ) { FT_Int n; FT_TRACE3(( "sfnt_open_font: file is a collection\n" )); if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) ) return error; if ( face->ttc_header.count == 0 ) return SFNT_Err_Invalid_Table; /* a rough size estimate: let's conservatively assume that there */ /* is just a single table info in each subfont header (12 + 16*1 = */ /* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */ /* size of the TTC header plus `28*count' bytes for all subfont */ /* headers */ if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) ) return SFNT_Err_Array_Too_Large; /* now read the offsets of each font in the file */ if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) ) return error; if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) ) return error; for ( n = 0; n < face->ttc_header.count; n++ ) face->ttc_header.offsets[n] = FT_GET_ULONG(); FT_FRAME_EXIT(); } else { FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" )); face->ttc_header.version = 1 << 16; face->ttc_header.count = 1; if ( FT_NEW( face->ttc_header.offsets ) ) return error; face->ttc_header.offsets[0] = offset; } return error; } FT_LOCAL_DEF( FT_Error ) sfnt_init_face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_Library library = face->root.driver->root.library; SFNT_Service sfnt; /* for now, parameters are unused */ FT_UNUSED( num_params ); FT_UNUSED( params ); sfnt = (SFNT_Service)face->sfnt; if ( !sfnt ) { sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); if ( !sfnt ) return SFNT_Err_Invalid_File_Format; face->sfnt = sfnt; face->goto_table = sfnt->goto_table; } FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS ); error = sfnt_open_font( stream, face ); if ( error ) return error; FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index )); if ( face_index < 0 ) face_index = 0; if ( face_index >= face->ttc_header.count ) return SFNT_Err_Invalid_Argument; if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) ) return error; /* check that we have a valid TrueType file */ error = sfnt->load_font_dir( face, stream ); if ( error ) return error; face->root.num_faces = face->ttc_header.count; face->root.face_index = face_index; return error; } #define LOAD_( x ) \ do { \ FT_TRACE2(( "`" #x "' " )); \ FT_TRACE3(( "-->\n" )); \ \ error = sfnt->load_##x( face, stream ); \ \ FT_TRACE2(( "%s\n", ( !error ) \ ? "loaded" \ : ( error == SFNT_Err_Table_Missing ) \ ? "missing" \ : "failed to load" )); \ FT_TRACE3(( "\n" )); \ } while ( 0 ) #define LOADM_( x, vertical ) \ do { \ FT_TRACE2(( "`%s" #x "' ", \ vertical ? "vertical " : "" )); \ FT_TRACE3(( "-->\n" )); \ \ error = sfnt->load_##x( face, stream, vertical ); \ \ FT_TRACE2(( "%s\n", ( !error ) \ ? "loaded" \ : ( error == SFNT_Err_Table_Missing ) \ ? "missing" \ : "failed to load" )); \ FT_TRACE3(( "\n" )); \ } while ( 0 ) #define GET_NAME( id, field ) \ do { \ error = tt_face_get_name( face, TT_NAME_ID_##id, field ); \ if ( error ) \ goto Exit; \ } while ( 0 ) FT_LOCAL_DEF( FT_Error ) sfnt_load_face( FT_Stream stream, TT_Face face, FT_Int face_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES FT_Error psnames_error; #endif FT_Bool has_outline; FT_Bool is_apple_sbit; FT_Bool ignore_preferred_family = FALSE; FT_Bool ignore_preferred_subfamily = FALSE; SFNT_Service sfnt = (SFNT_Service)face->sfnt; FT_UNUSED( face_index ); /* Check parameters */ { FT_Int i; for ( i = 0; i < num_params; i++ ) { if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY ) ignore_preferred_family = TRUE; else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY ) ignore_preferred_subfamily = TRUE; } } /* Load tables */ /* We now support two SFNT-based bitmapped font formats. They */ /* are recognized easily as they do not include a `glyf' */ /* table. */ /* */ /* The first format comes from Apple, and uses a table named */ /* `bhed' instead of `head' to store the font header (using */ /* the same format). It also doesn't include horizontal and */ /* vertical metrics tables (i.e. `hhea' and `vhea' tables are */ /* missing). */ /* */ /* The other format comes from Microsoft, and is used with */ /* WinCE/PocketPC. It looks like a standard TTF, except that */ /* it doesn't contain outlines. */ /* */ FT_TRACE2(( "sfnt_load_face: %08p\n\n", face )); /* do we have outlines in there? */ #ifdef FT_CONFIG_OPTION_INCREMENTAL has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 || tt_face_lookup_table( face, TTAG_glyf ) != 0 || tt_face_lookup_table( face, TTAG_CFF ) != 0 ); #else has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 || tt_face_lookup_table( face, TTAG_CFF ) != 0 ); #endif is_apple_sbit = 0; /* if this font doesn't contain outlines, we try to load */ /* a `bhed' table */ if ( !has_outline && sfnt->load_bhed ) { LOAD_( bhed ); is_apple_sbit = FT_BOOL( !error ); } /* load the font header (`head' table) if this isn't an Apple */ /* sbit font file */ if ( !is_apple_sbit ) { LOAD_( head ); if ( error ) goto Exit; } if ( face->header.Units_Per_EM == 0 ) { error = SFNT_Err_Invalid_Table; goto Exit; } /* the following tables are often not present in embedded TrueType */ /* fonts within PDF documents, so don't check for them. */ LOAD_( maxp ); LOAD_( cmap ); /* the following tables are optional in PCL fonts -- */ /* don't check for errors */ LOAD_( name ); LOAD_( post ); #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES psnames_error = error; #endif /* do not load the metrics headers and tables if this is an Apple */ /* sbit font file */ if ( !is_apple_sbit ) { /* load the `hhea' and `hmtx' tables */ LOADM_( hhea, 0 ); if ( !error ) { LOADM_( hmtx, 0 ); if ( error == SFNT_Err_Table_Missing ) { error = SFNT_Err_Hmtx_Table_Missing; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* If this is an incrementally loaded font and there are */ /* overriding metrics, tolerate a missing `hmtx' table. */ if ( face->root.internal->incremental_interface && face->root.internal->incremental_interface->funcs-> get_glyph_metrics ) { face->horizontal.number_Of_HMetrics = 0; error = SFNT_Err_Ok; } #endif } } else if ( error == SFNT_Err_Table_Missing ) { /* No `hhea' table necessary for SFNT Mac fonts. */ if ( face->format_tag == TTAG_true ) { FT_TRACE2(( "This is an SFNT Mac font.\n" )); has_outline = 0; error = SFNT_Err_Ok; } else { error = SFNT_Err_Horiz_Header_Missing; #ifdef FT_CONFIG_OPTION_INCREMENTAL /* If this is an incrementally loaded font and there are */ /* overriding metrics, tolerate a missing `hhea' table. */ if ( face->root.internal->incremental_interface && face->root.internal->incremental_interface->funcs-> get_glyph_metrics ) { face->horizontal.number_Of_HMetrics = 0; error = SFNT_Err_Ok; } #endif } } if ( error ) goto Exit; /* try to load the `vhea' and `vmtx' tables */ LOADM_( hhea, 1 ); if ( !error ) { LOADM_( hmtx, 1 ); if ( !error ) face->vertical_info = 1; } if ( error && error != SFNT_Err_Table_Missing ) goto Exit; LOAD_( os2 ); if ( error ) { /* we treat the table as missing if there are any errors */ face->os2.version = 0xFFFFU; } } /* the optional tables */ /* embedded bitmap support */ if ( sfnt->load_eblc ) { LOAD_( eblc ); if ( error ) { /* a font which contains neither bitmaps nor outlines is */ /* still valid (although rather useless in most cases); */ /* however, you can find such stripped fonts in PDFs */ if ( error == SFNT_Err_Table_Missing ) error = SFNT_Err_Ok; else goto Exit; } } LOAD_( pclt ); if ( error ) { if ( error != SFNT_Err_Table_Missing ) goto Exit; face->pclt.Version = 0; } /* consider the kerning and gasp tables as optional */ LOAD_( gasp ); LOAD_( kern ); face->root.num_glyphs = face->max_profile.numGlyphs; /* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */ /* a WWS-only font face. `WWS' stands for `weight', width', and */ /* `slope', a term used by Microsoft's Windows Presentation */ /* Foundation (WPF). This flag has been introduced in version */ /* 1.5 of the OpenType specification (May 2008). */ face->root.family_name = NULL; face->root.style_name = NULL; if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 ) { if ( !ignore_preferred_family ) GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); if ( !face->root.family_name ) GET_NAME( FONT_FAMILY, &face->root.family_name ); if ( !ignore_preferred_subfamily ) GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); if ( !face->root.style_name ) GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); } else { GET_NAME( WWS_FAMILY, &face->root.family_name ); if ( !face->root.family_name && !ignore_preferred_family ) GET_NAME( PREFERRED_FAMILY, &face->root.family_name ); if ( !face->root.family_name ) GET_NAME( FONT_FAMILY, &face->root.family_name ); GET_NAME( WWS_SUBFAMILY, &face->root.style_name ); if ( !face->root.style_name && !ignore_preferred_subfamily ) GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name ); if ( !face->root.style_name ) GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); } /* now set up root fields */ { FT_Face root = &face->root; FT_Long flags = root->face_flags; /*********************************************************************/ /* */ /* Compute face flags. */ /* */ if ( has_outline == TRUE ) flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */ /* The sfnt driver only supports bitmap fonts natively, thus we */ /* don't set FT_FACE_FLAG_HINTER. */ flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */ FT_FACE_FLAG_HORIZONTAL; /* horizontal data */ #ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES if ( psnames_error == SFNT_Err_Ok && face->postscript.FormatType != 0x00030000L ) flags |= FT_FACE_FLAG_GLYPH_NAMES; #endif /* fixed width font? */ if ( face->postscript.isFixedPitch ) flags |= FT_FACE_FLAG_FIXED_WIDTH; /* vertical information? */ if ( face->vertical_info ) flags |= FT_FACE_FLAG_VERTICAL; /* kerning available ? */ if ( TT_FACE_HAS_KERNING( face ) ) flags |= FT_FACE_FLAG_KERNING; #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT /* Don't bother to load the tables unless somebody asks for them. */ /* No need to do work which will (probably) not be used. */ if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 && tt_face_lookup_table( face, TTAG_fvar ) != 0 && tt_face_lookup_table( face, TTAG_gvar ) != 0 ) flags |= FT_FACE_FLAG_MULTIPLE_MASTERS; #endif root->face_flags = flags; /*********************************************************************/ /* */ /* Compute style flags. */ /* */ flags = 0; if ( has_outline == TRUE && face->os2.version != 0xFFFFU ) { /* We have an OS/2 table; use the `fsSelection' field. Bit 9 */ /* indicates an oblique font face. This flag has been */ /* introduced in version 1.5 of the OpenType specification. */ if ( face->os2.fsSelection & 512 ) /* bit 9 */ flags |= FT_STYLE_FLAG_ITALIC; else if ( face->os2.fsSelection & 1 ) /* bit 0 */ flags |= FT_STYLE_FLAG_ITALIC; if ( face->os2.fsSelection & 32 ) /* bit 5 */ flags |= FT_STYLE_FLAG_BOLD; } else { /* this is an old Mac font, use the header field */ if ( face->header.Mac_Style & 1 ) flags |= FT_STYLE_FLAG_BOLD; if ( face->header.Mac_Style & 2 ) flags |= FT_STYLE_FLAG_ITALIC; } root->style_flags = flags; /*********************************************************************/ /* */ /* Polish the charmaps. */ /* */ /* Try to set the charmap encoding according to the platform & */ /* encoding ID of each charmap. */ /* */ tt_face_build_cmaps( face ); /* ignore errors */ /* set the encoding fields */ { FT_Int m; for ( m = 0; m < root->num_charmaps; m++ ) { FT_CharMap charmap = root->charmaps[m]; charmap->encoding = sfnt_find_encoding( charmap->platform_id, charmap->encoding_id ); #if 0 if ( root->charmap == NULL && charmap->encoding == FT_ENCODING_UNICODE ) { /* set 'root->charmap' to the first Unicode encoding we find */ root->charmap = charmap; } #endif } } #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS /* * Now allocate the root array of FT_Bitmap_Size records and * populate them. Unfortunately, it isn't possible to indicate bit * depths in the FT_Bitmap_Size record. This is a design error. */ { FT_UInt i, count; #ifndef FT_CONFIG_OPTION_OLD_INTERNALS count = face->sbit_num_strikes; #else count = (FT_UInt)face->num_sbit_strikes; #endif if ( count > 0 ) { FT_Memory memory = face->root.stream->memory; FT_UShort em_size = face->header.Units_Per_EM; FT_Short avgwidth = face->os2.xAvgCharWidth; FT_Size_Metrics metrics; if ( em_size == 0 || face->os2.version == 0xFFFFU ) { avgwidth = 0; em_size = 1; } if ( FT_NEW_ARRAY( root->available_sizes, count ) ) goto Exit; for ( i = 0; i < count; i++ ) { FT_Bitmap_Size* bsize = root->available_sizes + i; error = sfnt->load_strike_metrics( face, i, &metrics ); if ( error ) goto Exit; bsize->height = (FT_Short)( metrics.height >> 6 ); bsize->width = (FT_Short)( ( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size ); bsize->x_ppem = metrics.x_ppem << 6; bsize->y_ppem = metrics.y_ppem << 6; /* assume 72dpi */ bsize->size = metrics.y_ppem << 6; } root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; root->num_fixed_sizes = (FT_Int)count; } } #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */ /* a font with no bitmaps and no outlines is scalable; */ /* it has only empty glyphs then */ if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) ) root->face_flags |= FT_FACE_FLAG_SCALABLE; /*********************************************************************/ /* */ /* Set up metrics. */ /* */ if ( FT_IS_SCALABLE( root ) ) { /* XXX What about if outline header is missing */ /* (e.g. sfnt wrapped bitmap)? */ root->bbox.xMin = face->header.xMin; root->bbox.yMin = face->header.yMin; root->bbox.xMax = face->header.xMax; root->bbox.yMax = face->header.yMax; root->units_per_EM = face->header.Units_Per_EM; /* XXX: Computing the ascender/descender/height is very different */ /* from what the specification tells you. Apparently, we */ /* must be careful because */ /* */ /* - not all fonts have an OS/2 table; in this case, we take */ /* the values in the horizontal header. However, these */ /* values very often are not reliable. */ /* */ /* - otherwise, the correct typographic values are in the */ /* sTypoAscender, sTypoDescender & sTypoLineGap fields. */ /* */ /* However, certain fonts have these fields set to 0. */ /* Rather, they have usWinAscent & usWinDescent correctly */ /* set (but with different values). */ /* */ /* As an example, Arial Narrow is implemented through four */ /* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */ /* */ /* Strangely, all fonts have the same values in their */ /* sTypoXXX fields, except ARIALNB which sets them to 0. */ /* */ /* On the other hand, they all have different */ /* usWinAscent/Descent values -- as a conclusion, the OS/2 */ /* table cannot be used to compute the text height reliably! */ /* */ /* The ascender/descender/height are computed from the OS/2 table */ /* when found. Otherwise, they're taken from the horizontal */ /* header. */ /* */ root->ascender = face->horizontal.Ascender; root->descender = face->horizontal.Descender; root->height = (FT_Short)( root->ascender - root->descender + face->horizontal.Line_Gap ); #if 0 /* if the line_gap is 0, we add an extra 15% to the text height -- */ /* this computation is based on various versions of Times New Roman */ if ( face->horizontal.Line_Gap == 0 ) root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 ); #endif /* 0 */ #if 0 /* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */ /* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */ if ( face->os2.version != 0xFFFFU && root->ascender ) { FT_Int height; root->ascender = face->os2.sTypoAscender; root->descender = -face->os2.sTypoDescender; height = root->ascender + root->descender + face->os2.sTypoLineGap; if ( height > root->height ) root->height = height; } #endif /* 0 */ root->max_advance_width = face->horizontal.advance_Width_Max; root->max_advance_height = (FT_Short)( face->vertical_info ? face->vertical.advance_Height_Max : root->height ); /* See http://www.microsoft.com/OpenType/OTSpec/post.htm -- */ /* Adjust underline position from top edge to centre of */ /* stroke to convert TrueType meaning to FreeType meaning. */ root->underline_position = face->postscript.underlinePosition - face->postscript.underlineThickness / 2; root->underline_thickness = face->postscript.underlineThickness; } } Exit: FT_TRACE2(( "sfnt_load_face: done\n" )); return error; } #undef LOAD_ #undef LOADM_ #undef GET_NAME FT_LOCAL_DEF( void ) sfnt_done_face( TT_Face face ) { FT_Memory memory; SFNT_Service sfnt; if ( !face ) return; memory = face->root.memory; sfnt = (SFNT_Service)face->sfnt; if ( sfnt ) { /* destroy the postscript names table if it is loaded */ if ( sfnt->free_psnames ) sfnt->free_psnames( face ); /* destroy the embedded bitmaps table if it is loaded */ if ( sfnt->free_eblc ) sfnt->free_eblc( face ); } #ifdef TT_CONFIG_OPTION_BDF /* freeing the embedded BDF properties */ tt_face_free_bdf_props( face ); #endif /* freeing the kerning table */ tt_face_done_kern( face ); /* freeing the collection table */ FT_FREE( face->ttc_header.offsets ); face->ttc_header.count = 0; /* freeing table directory */ FT_FREE( face->dir_tables ); face->num_tables = 0; { FT_Stream stream = FT_FACE_STREAM( face ); /* simply release the 'cmap' table frame */ FT_FRAME_RELEASE( face->cmap_table ); face->cmap_size = 0; } /* freeing the horizontal metrics */ #ifndef FT_CONFIG_OPTION_OLD_INTERNALS { FT_Stream stream = FT_FACE_STREAM( face ); FT_FRAME_RELEASE( face->horz_metrics ); FT_FRAME_RELEASE( face->vert_metrics ); face->horz_metrics_size = 0; face->vert_metrics_size = 0; } #else FT_FREE( face->horizontal.long_metrics ); FT_FREE( face->horizontal.short_metrics ); #endif /* freeing the vertical ones, if any */ if ( face->vertical_info ) { FT_FREE( face->vertical.long_metrics ); FT_FREE( face->vertical.short_metrics ); face->vertical_info = 0; } /* freeing the gasp table */ FT_FREE( face->gasp.gaspRanges ); face->gasp.numRanges = 0; /* freeing the name table */ if ( sfnt ) sfnt->free_name( face ); /* freeing family and style name */ FT_FREE( face->root.family_name ); FT_FREE( face->root.style_name ); /* freeing sbit size table */ FT_FREE( face->root.available_sizes ); face->root.num_fixed_sizes = 0; FT_FREE( face->postscript_name ); face->sfnt = 0; } /* END */