Edit
kc3-lang/freetype/src/sfnt/sfobjs.c
Alexei Podtelezhnikov
- src/sfnt/sfobjs.c
-
/**************************************************************************** * * sfobjs.c * * SFNT object management (base). * * Copyright (C) 1996-2024 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 "sfobjs.h" #include "ttload.h" #include "ttcmap.h" #include "ttkern.h" #include "sfwoff.h" #include "sfwoff2.h" #include <freetype/internal/sfnt.h> #include <freetype/internal/ftdebug.h> #include <freetype/ttnameid.h> #include <freetype/tttags.h> #include <freetype/internal/services/svpscmap.h> #include <freetype/ftsnames.h> #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT #include <freetype/internal/services/svmm.h> #include <freetype/internal/services/svmetric.h> #endif #include "sferrors.h" #ifdef TT_CONFIG_OPTION_BDF #include "ttbdf.h" #endif #ifdef TT_CONFIG_OPTION_GPOS_KERNING #include "ttgpos.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 sfobjs /* convert a UTF-16 name entry to ASCII */ static FT_String* tt_name_ascii_from_utf16( TT_Name 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_QNEW_ARRAY( string, len + 1 ) ) return NULL; for ( n = 0; n < len; n++ ) { code = FT_NEXT_USHORT( read ); if ( code == 0 ) break; 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_ascii_from_other( TT_Name 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_QNEW_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_Name_ConvertFunc)( TT_Name entry, FT_Memory memory ); /* documentation is in sfnt.h */ FT_LOCAL_DEF( 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_Name 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_Name_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_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_ascii_from_utf16; break; default: ; } } else if ( found_apple >= 0 ) { rec = face->name_table.names + found_apple; convert = tt_name_ascii_from_other; } else if ( found_unicode >= 0 ) { rec = face->name_table.names + found_unicode; convert = tt_name_ascii_from_utf16; } if ( rec && convert ) { if ( !rec->string ) { 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_PRC, FT_ENCODING_PRC }, { 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_Int* face_instance_index, FT_Long* woff2_num_faces ) { 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 }; #ifndef FT_CONFIG_OPTION_USE_BROTLI FT_UNUSED( face_instance_index ); FT_UNUSED( woff2_num_faces ); #endif face->ttc_header.tag = 0; face->ttc_header.version = 0; face->ttc_header.count = 0; #if defined( FT_CONFIG_OPTION_USE_ZLIB ) || \ defined( FT_CONFIG_OPTION_USE_BROTLI ) retry: #endif offset = FT_STREAM_POS(); if ( FT_READ_ULONG( tag ) ) return error; #ifdef FT_CONFIG_OPTION_USE_ZLIB if ( tag == TTAG_wOFF ) { FT_TRACE2(( "sfnt_open_font: file is a WOFF; synthesizing SFNT\n" )); if ( FT_STREAM_SEEK( offset ) ) return error; error = woff_open_font( stream, face ); if ( error ) return error; /* Swap out stream and retry! */ stream = face->root.stream; goto retry; } #endif #ifdef FT_CONFIG_OPTION_USE_BROTLI if ( tag == TTAG_wOF2 ) { FT_TRACE2(( "sfnt_open_font: file is a WOFF2; synthesizing SFNT\n" )); if ( FT_STREAM_SEEK( offset ) ) return error; error = woff2_open_font( stream, face, face_instance_index, woff2_num_faces ); if ( error ) return error; /* Swap out stream and retry! */ stream = face->root.stream; goto retry; } #endif if ( tag != 0x00010000UL && tag != TTAG_ttcf && tag != TTAG_OTTO && tag != TTAG_true && tag != TTAG_typ1 && tag != TTAG_0xA5kbd && tag != TTAG_0xA5lst && 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; FT_TRACE3(( " with %ld subfonts\n", face->ttc_header.count )); 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_QNEW_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_QNEW( 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_instance_index, FT_Int num_params, FT_Parameter* params ) { FT_Error error; FT_Library library = face->root.driver->root.library; SFNT_Service sfnt; FT_Int face_index; FT_Long woff2_num_faces = 0; /* 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 ); #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT if ( !face->mm ) { /* we want the MM interface from the `truetype' module only */ FT_Module tt_module = FT_Get_Module( library, "truetype" ); face->mm = ft_module_get_service( tt_module, FT_SERVICE_ID_MULTI_MASTERS, 0 ); } if ( !face->tt_var ) { /* we want the metrics variations interface */ /* from the `truetype' module only */ FT_Module tt_module = FT_Get_Module( library, "truetype" ); face->tt_var = ft_module_get_service( tt_module, FT_SERVICE_ID_METRICS_VARIATIONS, 0 ); } if ( !face->face_var ) face->face_var = ft_module_get_service( &face->root.driver->root, FT_SERVICE_ID_METRICS_VARIATIONS, 0 ); #endif FT_TRACE2(( "SFNT driver\n" )); error = sfnt_open_font( stream, face, &face_instance_index, &woff2_num_faces ); if ( error ) return error; /* Stream may have changed in sfnt_open_font. */ stream = face->root.stream; FT_TRACE2(( "sfnt_init_face: %p (index %d)\n", (void *)face, face_instance_index )); face_index = FT_ABS( face_instance_index ) & 0xFFFF; /* value -(N+1) requests information on index N */ if ( face_instance_index < 0 && face_index > 0 ) face_index--; if ( face_index >= face->ttc_header.count ) { if ( face_instance_index >= 0 ) return FT_THROW( Invalid_Argument ); else face_index = 0; } if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) ) return error; /* check whether we have a valid TrueType file */ error = sfnt->load_font_dir( face, stream ); if ( error ) return error; #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT { FT_Memory memory = face->root.memory; FT_ULong fvar_len; FT_ULong version; FT_ULong offset; FT_UShort num_axes; FT_UShort axis_size; FT_UShort num_instances; FT_UShort instance_size; FT_Int instance_index; FT_Byte* default_values = NULL; FT_Byte* instance_values = NULL; instance_index = FT_ABS( face_instance_index ) >> 16; /* test whether current face is a GX font with named instances */ if ( face->goto_table( face, TTAG_fvar, stream, &fvar_len ) || fvar_len < 20 || FT_READ_ULONG( version ) || FT_READ_USHORT( offset ) || FT_STREAM_SKIP( 2 ) /* reserved */ || FT_READ_USHORT( num_axes ) || FT_READ_USHORT( axis_size ) || FT_READ_USHORT( num_instances ) || FT_READ_USHORT( instance_size ) ) { version = 0; offset = 0; num_axes = 0; axis_size = 0; num_instances = 0; instance_size = 0; } /* check that the data is bound by the table length */ if ( version != 0x00010000UL || axis_size != 20 || num_axes == 0 || /* `num_axes' limit implied by 16-bit `instance_size' */ num_axes > 0x3FFE || !( instance_size == 4 + 4 * num_axes || instance_size == 6 + 4 * num_axes ) || /* `num_instances' limit implied by limited range of name IDs */ num_instances > 0x7EFF || offset + axis_size * num_axes + instance_size * num_instances > fvar_len ) num_instances = 0; else face->variation_support |= TT_FACE_FLAG_VAR_FVAR; /* * As documented in the OpenType specification, an entry for the * default instance may be omitted in the named instance table. In * particular this means that even if there is no named instance * table in the font we actually do have a named instance, namely the * default instance. * * For consistency, we always want the default instance in our list * of named instances. If it is missing, we try to synthesize it * later on. Here, we have to adjust `num_instances' accordingly. */ if ( ( face->variation_support & TT_FACE_FLAG_VAR_FVAR ) && !( FT_QALLOC( default_values, num_axes * 4 ) || FT_QALLOC( instance_values, num_axes * 4 ) ) ) { /* the current stream position is 16 bytes after the table start */ FT_ULong array_start = FT_STREAM_POS() - 16 + offset; FT_ULong default_value_offset, instance_offset; FT_Byte* p; FT_UInt i; default_value_offset = array_start + 8; p = default_values; for ( i = 0; i < num_axes; i++ ) { (void)FT_STREAM_READ_AT( default_value_offset, p, 4 ); default_value_offset += axis_size; p += 4; } instance_offset = array_start + axis_size * num_axes + 4; for ( i = 0; i < num_instances; i++ ) { (void)FT_STREAM_READ_AT( instance_offset, instance_values, num_axes * 4 ); if ( !ft_memcmp( default_values, instance_values, num_axes * 4 ) ) break; instance_offset += instance_size; } /* named instance indices start with value 1 */ face->var_default_named_instance = i + 1; if ( i == num_instances ) { /* no default instance in named instance table; */ /* we thus have to synthesize it */ num_instances++; } } FT_FREE( default_values ); FT_FREE( instance_values ); /* we don't support Multiple Master CFFs yet; */ /* note that `glyf' or `CFF2' have precedence */ if ( face->goto_table( face, TTAG_glyf, stream, 0 ) && face->goto_table( face, TTAG_CFF2, stream, 0 ) && !face->goto_table( face, TTAG_CFF, stream, 0 ) ) num_instances = 0; /* instance indices in `face_instance_index' start with index 1, */ /* thus `>' and not `>=' */ if ( instance_index > num_instances ) { if ( face_instance_index >= 0 ) return FT_THROW( Invalid_Argument ); else num_instances = 0; } face->root.style_flags = (FT_Long)num_instances << 16; } #endif face->root.num_faces = face->ttc_header.count; face->root.face_index = face_instance_index; /* `num_faces' for a WOFF2 needs to be handled separately. */ if ( woff2_num_faces ) face->root.num_faces = woff2_num_faces; 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_instance_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 has_CBLC; FT_Bool has_CBDT; FT_Bool has_EBLC; FT_Bool has_bloc; FT_Bool has_sbix; FT_Bool ignore_typographic_family = FALSE; FT_Bool ignore_typographic_subfamily = FALSE; FT_Bool ignore_sbix = FALSE; SFNT_Service sfnt = (SFNT_Service)face->sfnt; FT_UNUSED( face_instance_index ); /* Check parameters */ { FT_Int i; for ( i = 0; i < num_params; i++ ) { if ( params[i].tag == FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_FAMILY ) ignore_typographic_family = TRUE; else if ( params[i].tag == FT_PARAM_TAG_IGNORE_TYPOGRAPHIC_SUBFAMILY ) ignore_typographic_subfamily = TRUE; else if ( params[i].tag == FT_PARAM_TAG_IGNORE_SBIX ) ignore_sbix = 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: %p\n", (void *)face )); FT_TRACE2(( "\n" )); /* do we have outlines in there? */ #ifdef FT_CONFIG_OPTION_INCREMENTAL has_outline = FT_BOOL( face->root.internal->incremental_interface || tt_face_lookup_table( face, TTAG_glyf ) || tt_face_lookup_table( face, TTAG_CFF ) || tt_face_lookup_table( face, TTAG_CFF2 ) ); #else has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) || tt_face_lookup_table( face, TTAG_CFF ) || tt_face_lookup_table( face, TTAG_CFF2 ) ); #endif /* check which sbit formats are present */ has_CBLC = !face->goto_table( face, TTAG_CBLC, stream, 0 ); has_CBDT = !face->goto_table( face, TTAG_CBDT, stream, 0 ); has_EBLC = !face->goto_table( face, TTAG_EBLC, stream, 0 ); has_bloc = !face->goto_table( face, TTAG_bloc, stream, 0 ); has_sbix = !face->goto_table( face, TTAG_sbix, stream, 0 ); is_apple_sbit = FALSE; if ( ignore_sbix ) has_sbix = FALSE; /* 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 || has_sbix ) { LOAD_( head ); if ( error ) goto Exit; } /* Ignore outlines for CBLC/CBDT fonts. */ if ( has_CBLC || has_CBDT ) has_outline = FALSE; /* OpenType 1.8.2 introduced limits to this value; */ /* however, they make sense for older SFNT fonts also */ if ( face->header.Units_Per_EM < 16 || face->header.Units_Per_EM > 16384 ) { 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 */ /* TODO: Replace this clumsy check for all possible sbit tables */ /* with something better (for example, by passing a parameter */ /* to suppress 'sbix' loading). */ if ( sfnt->load_eblc && ( has_CBLC || has_EBLC || has_bloc || has_sbix ) ) LOAD_( eblc ); /* colored glyph support */ if ( sfnt->load_cpal ) { LOAD_( cpal ); LOAD_( colr ); } /* OpenType-SVG glyph support */ if ( sfnt->load_svg ) LOAD_( svg ); /* consider the pclt, kerning, and gasp tables as optional */ LOAD_( pclt ); LOAD_( gasp ); LOAD_( kern ); #ifdef TT_CONFIG_OPTION_GPOS_KERNING LOAD_( gpos ); #endif 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_typographic_family ) GET_NAME( TYPOGRAPHIC_FAMILY, &face->root.family_name ); if ( !face->root.family_name ) GET_NAME( FONT_FAMILY, &face->root.family_name ); if ( !ignore_typographic_subfamily ) GET_NAME( TYPOGRAPHIC_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_typographic_family ) GET_NAME( TYPOGRAPHIC_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_typographic_subfamily ) GET_NAME( TYPOGRAPHIC_SUBFAMILY, &face->root.style_name ); if ( !face->root.style_name ) GET_NAME( FONT_SUBFAMILY, &face->root.style_name ); } #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT { FT_Memory memory = face->root.memory; if ( FT_STRDUP( face->non_var_style_name, face->root.style_name ) ) goto Exit; } #endif /* now set up root fields */ { FT_Face root = &face->root; FT_Long flags = root->face_flags; /********************************************************************** * * Compute face flags. */ if ( face->sbit_table_type == TT_SBIT_TABLE_TYPE_CBLC || face->sbit_table_type == TT_SBIT_TABLE_TYPE_SBIX || face->colr || face->svg ) flags |= FT_FACE_FLAG_COLOR; /* color glyphs */ if ( has_outline == TRUE ) { /* by default (and for backward compatibility) we handle */ /* fonts with an 'sbix' table as bitmap-only */ if ( has_sbix ) flags |= FT_FACE_FLAG_SBIX; /* with 'sbix' bitmaps */ else 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 ) #ifdef TT_CONFIG_OPTION_GPOS_KERNING || face->gpos_kerning_available #endif ) 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 ( face->variation_support & TT_FACE_FLAG_VAR_FVAR ) 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. Emulate Unicode charmap if one * is missing. */ tt_face_build_cmaps( face ); /* ignore errors */ /* set the encoding fields */ { FT_Int m; #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES FT_Bool has_unicode = FALSE; #endif 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 ); #ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES if ( charmap->encoding == FT_ENCODING_UNICODE || charmap->encoding == FT_ENCODING_MS_SYMBOL ) /* PUA */ has_unicode = TRUE; } /* synthesize Unicode charmap if one is missing */ if ( !has_unicode && root->face_flags & FT_FACE_FLAG_GLYPH_NAMES ) { FT_CharMapRec cmaprec; cmaprec.face = root; cmaprec.platform_id = TT_PLATFORM_MICROSOFT; cmaprec.encoding_id = TT_MS_ID_UNICODE_CS; cmaprec.encoding = FT_ENCODING_UNICODE; error = FT_CMap_New( (FT_CMap_Class)&tt_cmap_unicode_class_rec, NULL, &cmaprec, NULL ); if ( error && FT_ERR_NEQ( error, No_Unicode_Glyph_Name ) && FT_ERR_NEQ( error, Unimplemented_Feature ) ) goto Exit; error = FT_Err_Ok; #endif /* FT_CONFIG_OPTION_POSTSCRIPT_NAMES */ } } #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 count; count = face->sbit_num_strikes; if ( count > 0 ) { FT_Memory memory = face->root.memory; FT_UShort em_size = face->header.Units_Per_EM; FT_Short avgwidth = face->os2.xAvgCharWidth; FT_Size_Metrics metrics; FT_UInt* sbit_strike_map = NULL; FT_UInt strike_idx, bsize_idx; if ( em_size == 0 || face->os2.version == 0xFFFFU ) { avgwidth = 1; em_size = 1; } /* to avoid invalid strike data in the `available_sizes' field */ /* of `FT_Face', we map `available_sizes' indices to strike */ /* indices */ if ( FT_NEW_ARRAY( root->available_sizes, count ) || FT_QNEW_ARRAY( sbit_strike_map, count ) ) goto Exit; bsize_idx = 0; for ( strike_idx = 0; strike_idx < count; strike_idx++ ) { FT_Bitmap_Size* bsize = root->available_sizes + bsize_idx; error = sfnt->load_strike_metrics( face, strike_idx, &metrics ); if ( error ) continue; 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; /* only use strikes with valid PPEM values */ if ( bsize->x_ppem && bsize->y_ppem ) sbit_strike_map[bsize_idx++] = strike_idx; } /* reduce array size to the actually used elements */ FT_MEM_QRENEW_ARRAY( sbit_strike_map, count, bsize_idx ); /* from now on, all strike indices are mapped */ /* using `sbit_strike_map' */ if ( bsize_idx ) { face->sbit_strike_map = sbit_strike_map; root->face_flags |= FT_FACE_FLAG_FIXED_SIZES; root->num_fixed_sizes = (FT_Int)bsize_idx; } } } #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 ) || FT_HAS_SBIX( 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; /* * Computing the ascender/descender/height is tricky. * * The OpenType specification v1.8.3 says: * * [OS/2's] sTypoAscender, sTypoDescender and sTypoLineGap fields * are intended to allow applications to lay out documents in a * typographically-correct and portable fashion. * * This is somewhat at odds with the decades of backwards * compatibility, operating systems and applications doing whatever * they want, not to mention broken fonts. * * Not all fonts have an OS/2 table; in this case, we take the values * in the horizontal header, although there is nothing stopping the * values from being unreliable. Even with a OS/2 table, certain fonts * set the sTypoAscender, sTypoDescender and sTypoLineGap fields to 0 * and instead correctly set usWinAscent and usWinDescent. * * As an example, Arial Narrow is shipped as four files ARIALN.TTF, * ARIALNI.TTF, ARIALNB.TTF and ARIALNBI.TTF. Strangely, all fonts have * the same values in their sTypo* fields, except ARIALNB.ttf which * sets them to 0. All of them have different usWinAscent/Descent * values. The OS/2 table therefore cannot be trusted for computing the * text height reliably. * * As a compromise, do the following: * * 1. If the OS/2 table exists and the fsSelection bit 7 is set * (USE_TYPO_METRICS), trust the font and use the sTypo* metrics. * 2. Otherwise, use the `hhea' table's metrics. * 3. If they are zero and the OS/2 table exists, * 1. use the OS/2 table's sTypo* metrics if they are non-zero. * 2. Otherwise, use the OS/2 table's usWin* metrics. */ if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 128 ) { root->ascender = face->os2.sTypoAscender; root->descender = face->os2.sTypoDescender; root->height = root->ascender - root->descender + face->os2.sTypoLineGap; } else { root->ascender = face->horizontal.Ascender; root->descender = face->horizontal.Descender; root->height = 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 = root->ascender - root->descender + face->os2.sTypoLineGap; } else { root->ascender = (FT_Short)face->os2.usWinAscent; root->descender = -(FT_Short)face->os2.usWinDescent; root->height = root->ascender - root->descender; } } } } root->max_advance_width = (FT_Short)face->horizontal.advance_Width_Max; root->max_advance_height = (FT_Short)( face->vertical_info ? face->vertical.advance_Height_Max : root->height ); /* See https://www.microsoft.com/typography/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 ); /* destroy color table data if it is loaded */ if ( sfnt->free_cpal ) { sfnt->free_cpal( face ); sfnt->free_colr( face ); } #ifdef FT_CONFIG_OPTION_SVG /* free SVG data */ if ( sfnt->free_svg ) sfnt->free_svg( face ); #endif } #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 ); #ifdef TT_CONFIG_OPTION_GPOS_KERNING /* freeing the GPOS table */ tt_face_done_gpos( face ); #endif /* 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; } face->horz_metrics_size = 0; face->vert_metrics_size = 0; /* freeing vertical metrics, 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 ); FT_FREE( face->sbit_strike_map ); face->root.num_fixed_sizes = 0; FT_FREE( face->postscript_name ); #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT FT_FREE( face->var_postscript_prefix ); FT_FREE( face->non_var_style_name ); #endif /* freeing glyph color palette data */ FT_FREE( face->palette_data.palette_name_ids ); FT_FREE( face->palette_data.palette_flags ); FT_FREE( face->palette_data.palette_entry_name_ids ); FT_FREE( face->palette ); face->sfnt = NULL; } /* END */