1522 lines
48 KiB
C
1522 lines
48 KiB
C
/****************************************************************************
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*
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* sfobjs.c
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*
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* SFNT object management (base).
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*
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* Copyright (C) 1996-2022 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#include "sfobjs.h"
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#include "ttload.h"
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#include "ttcmap.h"
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#include "ttkern.h"
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#include "sfwoff.h"
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#include "sfwoff2.h"
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#include <freetype/internal/sfnt.h>
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#include <freetype/internal/ftdebug.h>
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#include <freetype/ttnameid.h>
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#include <freetype/tttags.h>
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#include <freetype/internal/services/svpscmap.h>
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#include <freetype/ftsnames.h>
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include <freetype/internal/services/svmm.h>
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#include <freetype/internal/services/svmetric.h>
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#endif
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#include "sferrors.h"
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#ifdef TT_CONFIG_OPTION_BDF
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#include "ttbdf.h"
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#endif
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/**************************************************************************
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*
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* The macro FT_COMPONENT is used in trace mode. It is an implicit
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* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
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* messages during execution.
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*/
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#undef FT_COMPONENT
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#define FT_COMPONENT sfobjs
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/* convert a UTF-16 name entry to ASCII */
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static FT_String*
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tt_name_ascii_from_utf16( TT_Name entry,
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FT_Memory memory )
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{
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FT_String* string = NULL;
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FT_UInt len, code, n;
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FT_Byte* read = (FT_Byte*)entry->string;
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FT_Error error;
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len = (FT_UInt)entry->stringLength / 2;
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if ( FT_QNEW_ARRAY( string, len + 1 ) )
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return NULL;
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for ( n = 0; n < len; n++ )
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{
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code = FT_NEXT_USHORT( read );
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if ( code == 0 )
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break;
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if ( code < 32 || code > 127 )
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code = '?';
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string[n] = (char)code;
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}
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string[n] = 0;
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return string;
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}
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/* convert an Apple Roman or symbol name entry to ASCII */
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static FT_String*
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tt_name_ascii_from_other( TT_Name entry,
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FT_Memory memory )
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{
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FT_String* string = NULL;
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FT_UInt len, code, n;
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FT_Byte* read = (FT_Byte*)entry->string;
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FT_Error error;
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len = (FT_UInt)entry->stringLength;
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if ( FT_QNEW_ARRAY( string, len + 1 ) )
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return NULL;
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for ( n = 0; n < len; n++ )
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{
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code = *read++;
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if ( code == 0 )
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break;
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if ( code < 32 || code > 127 )
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code = '?';
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string[n] = (char)code;
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}
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string[n] = 0;
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return string;
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}
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typedef FT_String* (*TT_Name_ConvertFunc)( TT_Name entry,
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FT_Memory memory );
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/* documentation is in sfnt.h */
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FT_LOCAL_DEF( FT_Error )
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tt_face_get_name( TT_Face face,
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FT_UShort nameid,
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FT_String** name )
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{
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FT_Memory memory = face->root.memory;
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FT_Error error = FT_Err_Ok;
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FT_String* result = NULL;
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FT_UShort n;
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TT_Name rec;
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FT_Int found_apple = -1;
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FT_Int found_apple_roman = -1;
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FT_Int found_apple_english = -1;
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FT_Int found_win = -1;
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FT_Int found_unicode = -1;
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FT_Bool is_english = 0;
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TT_Name_ConvertFunc convert;
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FT_ASSERT( name );
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rec = face->name_table.names;
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for ( n = 0; n < face->num_names; n++, rec++ )
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{
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/* According to the OpenType 1.3 specification, only Microsoft or */
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/* Apple platform IDs might be used in the `name' table. The */
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/* `Unicode' platform is reserved for the `cmap' table, and the */
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/* `ISO' one is deprecated. */
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/* */
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/* However, the Apple TrueType specification doesn't say the same */
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/* thing and goes to suggest that all Unicode `name' table entries */
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/* should be coded in UTF-16 (in big-endian format I suppose). */
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/* */
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if ( rec->nameID == nameid && rec->stringLength > 0 )
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{
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switch ( rec->platformID )
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{
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case TT_PLATFORM_APPLE_UNICODE:
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case TT_PLATFORM_ISO:
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/* there is `languageID' to check there. We should use this */
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/* field only as a last solution when nothing else is */
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/* available. */
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/* */
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found_unicode = n;
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break;
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case TT_PLATFORM_MACINTOSH:
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/* This is a bit special because some fonts will use either */
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/* an English language id, or a Roman encoding id, to indicate */
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/* the English version of its font name. */
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/* */
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if ( rec->languageID == TT_MAC_LANGID_ENGLISH )
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found_apple_english = n;
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else if ( rec->encodingID == TT_MAC_ID_ROMAN )
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found_apple_roman = n;
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break;
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case TT_PLATFORM_MICROSOFT:
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/* we only take a non-English name when there is nothing */
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/* else available in the font */
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/* */
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if ( found_win == -1 || ( rec->languageID & 0x3FF ) == 0x009 )
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{
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switch ( rec->encodingID )
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{
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case TT_MS_ID_SYMBOL_CS:
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case TT_MS_ID_UNICODE_CS:
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case TT_MS_ID_UCS_4:
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is_english = FT_BOOL( ( rec->languageID & 0x3FF ) == 0x009 );
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found_win = n;
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break;
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default:
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;
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}
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}
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break;
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default:
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;
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}
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}
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}
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found_apple = found_apple_roman;
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if ( found_apple_english >= 0 )
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found_apple = found_apple_english;
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/* some fonts contain invalid Unicode or Macintosh formatted entries; */
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/* we will thus favor names encoded in Windows formats if available */
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/* (provided it is an English name) */
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/* */
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convert = NULL;
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if ( found_win >= 0 && !( found_apple >= 0 && !is_english ) )
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{
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rec = face->name_table.names + found_win;
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switch ( rec->encodingID )
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{
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/* all Unicode strings are encoded using UTF-16BE */
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case TT_MS_ID_UNICODE_CS:
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case TT_MS_ID_SYMBOL_CS:
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convert = tt_name_ascii_from_utf16;
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break;
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case TT_MS_ID_UCS_4:
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/* Apparently, if this value is found in a name table entry, it is */
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/* documented as `full Unicode repertoire'. Experience with the */
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/* MsGothic font shipped with Windows Vista shows that this really */
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/* means UTF-16 encoded names (UCS-4 values are only used within */
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/* charmaps). */
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convert = tt_name_ascii_from_utf16;
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break;
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default:
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;
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}
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}
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else if ( found_apple >= 0 )
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{
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rec = face->name_table.names + found_apple;
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convert = tt_name_ascii_from_other;
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}
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else if ( found_unicode >= 0 )
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{
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rec = face->name_table.names + found_unicode;
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convert = tt_name_ascii_from_utf16;
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}
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if ( rec && convert )
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{
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if ( !rec->string )
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{
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FT_Stream stream = face->name_table.stream;
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if ( FT_QNEW_ARRAY ( rec->string, rec->stringLength ) ||
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FT_STREAM_SEEK( rec->stringOffset ) ||
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FT_STREAM_READ( rec->string, rec->stringLength ) )
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{
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FT_FREE( rec->string );
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rec->stringLength = 0;
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result = NULL;
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goto Exit;
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}
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}
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result = convert( rec, memory );
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}
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Exit:
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*name = result;
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return error;
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}
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static FT_Encoding
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sfnt_find_encoding( int platform_id,
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int encoding_id )
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{
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typedef struct TEncoding_
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{
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int platform_id;
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int encoding_id;
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FT_Encoding encoding;
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} TEncoding;
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static
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const TEncoding tt_encodings[] =
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{
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{ TT_PLATFORM_ISO, -1, FT_ENCODING_UNICODE },
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{ TT_PLATFORM_APPLE_UNICODE, -1, FT_ENCODING_UNICODE },
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{ TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, FT_ENCODING_APPLE_ROMAN },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, FT_ENCODING_MS_SYMBOL },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_UCS_4, FT_ENCODING_UNICODE },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, FT_ENCODING_UNICODE },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, FT_ENCODING_SJIS },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_PRC, FT_ENCODING_PRC },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, FT_ENCODING_BIG5 },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, FT_ENCODING_WANSUNG },
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{ TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, FT_ENCODING_JOHAB }
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};
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const TEncoding *cur, *limit;
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|
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cur = tt_encodings;
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limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );
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for ( ; cur < limit; cur++ )
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{
|
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if ( cur->platform_id == platform_id )
|
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{
|
|
if ( cur->encoding_id == encoding_id ||
|
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cur->encoding_id == -1 )
|
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return cur->encoding;
|
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}
|
|
}
|
|
|
|
return FT_ENCODING_NONE;
|
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}
|
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|
|
|
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/* Fill in face->ttc_header. If the font is not a TTC, it is */
|
|
/* synthesized into a TTC with one offset table. */
|
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static FT_Error
|
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sfnt_open_font( FT_Stream stream,
|
|
TT_Face face,
|
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FT_Int* face_instance_index,
|
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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
|
|
|
|
|
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face->ttc_header.tag = 0;
|
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face->ttc_header.version = 0;
|
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face->ttc_header.count = 0;
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|
|
|
#if defined( FT_CONFIG_OPTION_USE_ZLIB ) || \
|
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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;
|
|
|
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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,
|
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face,
|
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face_instance_index,
|
|
woff2_num_faces );
|
|
if ( error )
|
|
return error;
|
|
|
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/* 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->var )
|
|
{
|
|
/* we want the metrics variations interface */
|
|
/* from the `truetype' module only */
|
|
FT_Module tt_module = FT_Get_Module( library, "truetype" );
|
|
|
|
|
|
face->var = ft_module_get_service( tt_module,
|
|
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;
|
|
}
|
|
|
|
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 );
|
|
|
|
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 );
|
|
}
|
|
|
|
/* 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 ) )
|
|
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 )
|
|
{
|
|
if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
|
|
tt_face_lookup_table( face, TTAG_gvar ) != 0 )
|
|
flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
|
|
if ( tt_face_lookup_table( face, TTAG_CFF2 ) != 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. 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.stream->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 );
|
|
|
|
/* 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 );
|
|
#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 */
|