sfobjs.c
上传用户:yisoukefu
上传日期:2020-08-09
资源大小:39506k
文件大小:35k
- /***************************************************************************/
- /* */
- /* sfobjs.c */
- /* */
- /* SFNT object management (base). */
- /* */
- /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007 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 "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;
- 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;
- 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. */
- /* */
- /* <Return> */
- /* Character string. NULL if no name is present. */
- /* */
- static FT_String*
- tt_face_get_name( TT_Face face,
- FT_UShort nameid )
- {
- FT_Memory memory = face->root.memory;
- 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;
- 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_Error error = SFNT_Err_Ok;
- FT_Stream stream = face->name_table.stream;
- FT_UNUSED( error );
- 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:
- return result;
- }
- 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 ),
- 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 != FT_MAKE_TAG( 'O', 'T', 'T', 'O' ) &&
- tag != TTAG_true &&
- 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 collectionn" ));
- if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
- return error;
- /* 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 TTCn" ));
- 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, %ldn", face, face_index ));
- if ( face_index < 0 )
- face_index = 0;
- if ( face_index >= face->ttc_header.count )
- return SFNT_Err_Bad_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;
- return error;
- }
- #define LOAD_( x )
- do {
- FT_TRACE2(( "`" #x "' " ));
- FT_TRACE3(( "-->n" ));
-
- error = sfnt->load_##x( face, stream );
-
- FT_TRACE2(( "%sn", ( !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(( "%sn", ( !error )
- ? "loaded"
- : ( error == SFNT_Err_Table_Missing )
- ? "missing"
- : "failed to load" ));
- FT_TRACE3(( "n" ));
- } 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, psnames_error;
- FT_Bool has_outline;
- FT_Bool is_apple_sbit;
- SFNT_Service sfnt = (SFNT_Service)face->sfnt;
- FT_UNUSED( face_index );
- FT_UNUSED( num_params );
- FT_UNUSED( params );
- /* 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: %08pnn", 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 );
- psnames_error = error;
- /* 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 )
- {
- if ( error != SFNT_Err_Table_Missing )
- goto Exit;
- face->os2.version = 0xFFFFU;
- }
- }
- /* the optional tables */
- /* embedded bitmap support. */
- if ( sfnt->load_eblc )
- {
- LOAD_( eblc );
- if ( error )
- {
- /* return an error if this font file has no outlines */
- if ( error == SFNT_Err_Table_Missing && has_outline )
- 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 );
- error = SFNT_Err_Ok;
- face->root.num_glyphs = face->max_profile.numGlyphs;
- face->root.family_name = tt_face_get_name( face,
- TT_NAME_ID_PREFERRED_FAMILY );
- if ( !face->root.family_name )
- face->root.family_name = tt_face_get_name( face,
- TT_NAME_ID_FONT_FAMILY );
- face->root.style_name = tt_face_get_name( face,
- TT_NAME_ID_PREFERRED_SUBFAMILY );
- if ( !face->root.style_name )
- face->root.style_name = tt_face_get_name( face,
- TT_NAME_ID_FONT_SUBFAMILY );
- /* now set up root fields */
- {
- FT_Face root = &face->root;
- FT_Int32 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 */
- if ( face->os2.fsSelection & 1 )
- flags |= FT_STYLE_FLAG_ITALIC;
- if ( face->os2.fsSelection & 32 )
- 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
- }
- }
- /*********************************************************************/
- /* */
- /* Set up metrics. */
- /* */
- if ( has_outline == TRUE )
- {
- /* 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
- #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 );
- root->underline_position = face->postscript.underlinePosition;
- root->underline_thickness = face->postscript.underlineThickness;
- }
- #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;
- #if !defined 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 */
- }
- Exit:
- FT_TRACE2(( "sfnt_load_face: donen" ));
- return error;
- }
- #undef LOAD_
- #undef LOADM_
- FT_LOCAL_DEF( void )
- sfnt_done_face( TT_Face face )
- {
- FT_Memory memory = face->root.memory;
- SFNT_Service 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 */
- #if !defined 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 */
- 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 */