| /***************************************************************************/ |
| /* */ |
| /* sfobjs.c */ |
| /* */ |
| /* SFNT object management (base). */ |
| /* */ |
| /* Copyright 1996-2008, 2010-2013 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 "../../include/ft2build.h" |
| #include "sfobjs.h" |
| #include "ttload.h" |
| #include "ttcmap.h" |
| #include "ttkern.h" |
| #include "../../include/freetype/internal/sfnt.h" |
| #include "../../include/freetype/internal/ftdebug.h" |
| #include "../../include/freetype/ttnameid.h" |
| #include "../../include/freetype/tttags.h" |
| #include "../../include/freetype/internal/services/svpscmap.h" |
| #include "../../include/freetype/ftsnames.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 == 0 ) |
| break; |
| |
| if (code > 255) /*Johnson 2010-10-09, #TESTDOC:0000042_QUT20005_5.pdf.*/ |
| code = code>>8&0x00ff; |
| if ( code < 32 || code > 127 ) |
| code = '?'; |
| |
| string[n] = (char)code; |
| } |
| |
| string[n] = 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 == 0 ) |
| break; |
| |
| if ( code < 32 || code > 127 ) |
| code = '?'; |
| |
| string[n] = (char)code; |
| } |
| |
| string[n] = 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 = FT_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 ) |
| { |
| FT_TRACE2(( " not a font using the SFNT container format\n" )); |
| return FT_THROW( 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 FT_THROW( 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 FT_THROW( 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 ) |
| { |
| FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" )); |
| return FT_THROW( Missing_Module ); |
| } |
| |
| face->sfnt = sfnt; |
| face->goto_table = sfnt->goto_table; |
| } |
| |
| FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS ); |
| |
| FT_TRACE2(( "SFNT driver\n" )); |
| |
| 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 FT_THROW( 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" \ |
| : FT_ERR_EQ( error, 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" \ |
| : FT_ERR_EQ( error, 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 = FT_THROW( 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 ( FT_ERR_EQ( error, Table_Missing ) ) |
| { |
| error = FT_THROW( 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 = FT_Err_Ok; |
| } |
| #endif |
| } |
| } |
| else if ( FT_ERR_EQ( error, 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 = FT_Err_Ok; |
| } |
| else |
| { |
| error = FT_THROW( 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 = FT_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 && FT_ERR_NEQ( error, 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 ( FT_ERR_EQ( error, Table_Missing ) ) |
| error = FT_Err_Ok; |
| else |
| goto Exit; |
| } |
| } |
| |
| LOAD_( pclt ); |
| if ( error ) |
| { |
| if ( FT_ERR_NEQ( error, 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 && |
| 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; |
| |
| |
| count = face->sbit_num_strikes; |
| |
| 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 and descender are taken from the `hhea' table. */ |
| /* If zero, they are taken from the `OS/2' table. */ |
| |
| root->ascender = face->horizontal.Ascender; |
| root->descender = face->horizontal.Descender; |
| |
| root->height = (FT_Short)( root->ascender - root->descender + |
| face->horizontal.Line_Gap ); |
| |
| if ( !( root->ascender || root->descender ) ) |
| { |
| if ( face->os2.version != 0xFFFFU ) |
| { |
| if ( face->os2.sTypoAscender || face->os2.sTypoDescender ) |
| { |
| root->ascender = face->os2.sTypoAscender; |
| root->descender = face->os2.sTypoDescender; |
| |
| root->height = (FT_Short)( root->ascender - root->descender + |
| face->os2.sTypoLineGap ); |
| } |
| else |
| { |
| root->ascender = (FT_Short)face->os2.usWinAscent; |
| root->descender = -(FT_Short)face->os2.usWinDescent; |
| |
| root->height = (FT_UShort)( root->ascender - root->descender ); |
| } |
| } |
| } |
| |
| 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 */ |
| { |
| 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; |
| } |
| |
| /* 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 */ |
