1578 lines
50 KiB
C
1578 lines
50 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 1996-2015 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 <ft2build.h>
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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 FT_INTERNAL_SFNT_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_TRUETYPE_IDS_H
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#include FT_TRUETYPE_TAGS_H
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#include FT_SERVICE_POSTSCRIPT_CMAPS_H
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#include FT_SFNT_NAMES_H
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#include FT_GZIP_H
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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 trace_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_entry_ascii_from_utf16( TT_NameEntry 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_NEW_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_entry_ascii_from_other( TT_NameEntry 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_NEW_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_NameEntry_ConvertFunc)( TT_NameEntry entry,
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FT_Memory memory );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_face_get_name */
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/* */
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/* <Description> */
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/* Returns a given ENGLISH name record in ASCII. */
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/* */
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/* <Input> */
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/* face :: A handle to the source face object. */
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/* */
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/* nameid :: The name id of the name record to return. */
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/* */
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/* <InOut> */
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/* name :: The address of a string pointer. NULL if no name is */
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/* present. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static 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_NameEntryRec* 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_NameEntry_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_entry_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_entry_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_entry_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_entry_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 == NULL )
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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_GB2312, FT_ENCODING_GB2312 },
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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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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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{
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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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}
|
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}
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|
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return FT_ENCODING_NONE;
|
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}
|
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|
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#define WRITE_USHORT( p, v ) \
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do \
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{ \
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*(p)++ = (FT_Byte)( (v) >> 8 ); \
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*(p)++ = (FT_Byte)( (v) >> 0 ); \
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\
|
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} while ( 0 )
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|
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#define WRITE_ULONG( p, v ) \
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do \
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{ \
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*(p)++ = (FT_Byte)( (v) >> 24 ); \
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*(p)++ = (FT_Byte)( (v) >> 16 ); \
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*(p)++ = (FT_Byte)( (v) >> 8 ); \
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*(p)++ = (FT_Byte)( (v) >> 0 ); \
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\
|
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} while ( 0 )
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|
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static void
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sfnt_stream_close( FT_Stream stream )
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{
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FT_Memory memory = stream->memory;
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|
|
|
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FT_FREE( stream->base );
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|
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stream->size = 0;
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stream->base = 0;
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stream->close = 0;
|
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}
|
|
|
|
|
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FT_CALLBACK_DEF( int )
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compare_offsets( const void* a,
|
|
const void* b )
|
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{
|
|
WOFF_Table table1 = *(WOFF_Table*)a;
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WOFF_Table table2 = *(WOFF_Table*)b;
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|
|
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FT_ULong offset1 = table1->Offset;
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FT_ULong offset2 = table2->Offset;
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|
|
|
|
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if ( offset1 > offset2 )
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return 1;
|
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else if ( offset1 < offset2 )
|
|
return -1;
|
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else
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Replace `face->root.stream' with a stream containing the extracted */
|
|
/* SFNT of a WOFF font. */
|
|
|
|
static FT_Error
|
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woff_open_font( FT_Stream stream,
|
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TT_Face face )
|
|
{
|
|
FT_Memory memory = stream->memory;
|
|
FT_Error error = FT_Err_Ok;
|
|
|
|
WOFF_HeaderRec woff;
|
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WOFF_Table tables = NULL;
|
|
WOFF_Table* indices = NULL;
|
|
|
|
FT_ULong woff_offset;
|
|
|
|
FT_Byte* sfnt = NULL;
|
|
FT_Stream sfnt_stream = NULL;
|
|
|
|
FT_Byte* sfnt_header;
|
|
FT_ULong sfnt_offset;
|
|
|
|
FT_Int nn;
|
|
FT_ULong old_tag = 0;
|
|
|
|
static const FT_Frame_Field woff_header_fields[] =
|
|
{
|
|
#undef FT_STRUCTURE
|
|
#define FT_STRUCTURE WOFF_HeaderRec
|
|
|
|
FT_FRAME_START( 44 ),
|
|
FT_FRAME_ULONG ( signature ),
|
|
FT_FRAME_ULONG ( flavor ),
|
|
FT_FRAME_ULONG ( length ),
|
|
FT_FRAME_USHORT( num_tables ),
|
|
FT_FRAME_USHORT( reserved ),
|
|
FT_FRAME_ULONG ( totalSfntSize ),
|
|
FT_FRAME_USHORT( majorVersion ),
|
|
FT_FRAME_USHORT( minorVersion ),
|
|
FT_FRAME_ULONG ( metaOffset ),
|
|
FT_FRAME_ULONG ( metaLength ),
|
|
FT_FRAME_ULONG ( metaOrigLength ),
|
|
FT_FRAME_ULONG ( privOffset ),
|
|
FT_FRAME_ULONG ( privLength ),
|
|
FT_FRAME_END
|
|
};
|
|
|
|
|
|
FT_ASSERT( stream == face->root.stream );
|
|
FT_ASSERT( FT_STREAM_POS() == 0 );
|
|
|
|
if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) )
|
|
return error;
|
|
|
|
/* Make sure we don't recurse back here or hit TTC code. */
|
|
if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf )
|
|
return FT_THROW( Invalid_Table );
|
|
|
|
/* Miscellaneous checks. */
|
|
if ( woff.length != stream->size ||
|
|
woff.num_tables == 0 ||
|
|
44 + woff.num_tables * 20UL >= woff.length ||
|
|
12 + woff.num_tables * 16UL >= woff.totalSfntSize ||
|
|
( woff.totalSfntSize & 3 ) != 0 ||
|
|
( woff.metaOffset == 0 && ( woff.metaLength != 0 ||
|
|
woff.metaOrigLength != 0 ) ) ||
|
|
( woff.metaLength != 0 && woff.metaOrigLength == 0 ) ||
|
|
( woff.privOffset == 0 && woff.privLength != 0 ) )
|
|
return FT_THROW( Invalid_Table );
|
|
|
|
if ( FT_ALLOC( sfnt, woff.totalSfntSize ) ||
|
|
FT_NEW( sfnt_stream ) )
|
|
goto Exit;
|
|
|
|
sfnt_header = sfnt;
|
|
|
|
/* Write sfnt header. */
|
|
{
|
|
FT_UInt searchRange, entrySelector, rangeShift, x;
|
|
|
|
|
|
x = woff.num_tables;
|
|
entrySelector = 0;
|
|
while ( x )
|
|
{
|
|
x >>= 1;
|
|
entrySelector += 1;
|
|
}
|
|
entrySelector--;
|
|
|
|
searchRange = ( 1 << entrySelector ) * 16;
|
|
rangeShift = woff.num_tables * 16 - searchRange;
|
|
|
|
WRITE_ULONG ( sfnt_header, woff.flavor );
|
|
WRITE_USHORT( sfnt_header, woff.num_tables );
|
|
WRITE_USHORT( sfnt_header, searchRange );
|
|
WRITE_USHORT( sfnt_header, entrySelector );
|
|
WRITE_USHORT( sfnt_header, rangeShift );
|
|
}
|
|
|
|
/* While the entries in the sfnt header must be sorted by the */
|
|
/* tag value, the tables themselves are not. We thus have to */
|
|
/* sort them by offset and check that they don't overlap. */
|
|
|
|
if ( FT_NEW_ARRAY( tables, woff.num_tables ) ||
|
|
FT_NEW_ARRAY( indices, woff.num_tables ) )
|
|
goto Exit;
|
|
|
|
FT_TRACE2(( "\n"
|
|
" tag offset compLen origLen checksum\n"
|
|
" -------------------------------------------\n" ));
|
|
|
|
if ( FT_FRAME_ENTER( 20L * woff.num_tables ) )
|
|
goto Exit;
|
|
|
|
for ( nn = 0; nn < woff.num_tables; nn++ )
|
|
{
|
|
WOFF_Table table = tables + nn;
|
|
|
|
table->Tag = FT_GET_TAG4();
|
|
table->Offset = FT_GET_ULONG();
|
|
table->CompLength = FT_GET_ULONG();
|
|
table->OrigLength = FT_GET_ULONG();
|
|
table->CheckSum = FT_GET_ULONG();
|
|
|
|
FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx %08lx\n",
|
|
(FT_Char)( table->Tag >> 24 ),
|
|
(FT_Char)( table->Tag >> 16 ),
|
|
(FT_Char)( table->Tag >> 8 ),
|
|
(FT_Char)( table->Tag ),
|
|
table->Offset,
|
|
table->CompLength,
|
|
table->OrigLength,
|
|
table->CheckSum ));
|
|
|
|
if ( table->Tag <= old_tag )
|
|
{
|
|
FT_FRAME_EXIT();
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
old_tag = table->Tag;
|
|
indices[nn] = table;
|
|
}
|
|
|
|
FT_FRAME_EXIT();
|
|
|
|
/* Sort by offset. */
|
|
|
|
ft_qsort( indices,
|
|
woff.num_tables,
|
|
sizeof ( WOFF_Table ),
|
|
compare_offsets );
|
|
|
|
/* Check offsets and lengths. */
|
|
|
|
woff_offset = 44 + woff.num_tables * 20L;
|
|
sfnt_offset = 12 + woff.num_tables * 16L;
|
|
|
|
for ( nn = 0; nn < woff.num_tables; nn++ )
|
|
{
|
|
WOFF_Table table = indices[nn];
|
|
|
|
|
|
if ( table->Offset != woff_offset ||
|
|
table->CompLength > woff.length ||
|
|
table->Offset > woff.length - table->CompLength ||
|
|
table->OrigLength > woff.totalSfntSize ||
|
|
sfnt_offset > woff.totalSfntSize - table->OrigLength ||
|
|
table->CompLength > table->OrigLength )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
table->OrigOffset = sfnt_offset;
|
|
|
|
/* The offsets must be multiples of 4. */
|
|
woff_offset += ( table->CompLength + 3 ) & ~3U;
|
|
sfnt_offset += ( table->OrigLength + 3 ) & ~3U;
|
|
}
|
|
|
|
/*
|
|
* Final checks!
|
|
*
|
|
* We don't decode and check the metadata block.
|
|
* We don't check table checksums either.
|
|
* But other than those, I think we implement all
|
|
* `MUST' checks from the spec.
|
|
*/
|
|
|
|
if ( woff.metaOffset )
|
|
{
|
|
if ( woff.metaOffset != woff_offset ||
|
|
woff.metaOffset + woff.metaLength > woff.length )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
/* We have padding only ... */
|
|
woff_offset += woff.metaLength;
|
|
}
|
|
|
|
if ( woff.privOffset )
|
|
{
|
|
/* ... if it isn't the last block. */
|
|
woff_offset = ( woff_offset + 3 ) & ~3U;
|
|
|
|
if ( woff.privOffset != woff_offset ||
|
|
woff.privOffset + woff.privLength > woff.length )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
/* No padding for the last block. */
|
|
woff_offset += woff.privLength;
|
|
}
|
|
|
|
if ( sfnt_offset != woff.totalSfntSize ||
|
|
woff_offset != woff.length )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
/* Write the tables. */
|
|
|
|
for ( nn = 0; nn < woff.num_tables; nn++ )
|
|
{
|
|
WOFF_Table table = tables + nn;
|
|
|
|
|
|
/* Write SFNT table entry. */
|
|
WRITE_ULONG( sfnt_header, table->Tag );
|
|
WRITE_ULONG( sfnt_header, table->CheckSum );
|
|
WRITE_ULONG( sfnt_header, table->OrigOffset );
|
|
WRITE_ULONG( sfnt_header, table->OrigLength );
|
|
|
|
/* Write table data. */
|
|
if ( FT_STREAM_SEEK( table->Offset ) ||
|
|
FT_FRAME_ENTER( table->CompLength ) )
|
|
goto Exit;
|
|
|
|
if ( table->CompLength == table->OrigLength )
|
|
{
|
|
/* Uncompressed data; just copy. */
|
|
ft_memcpy( sfnt + table->OrigOffset,
|
|
stream->cursor,
|
|
table->OrigLength );
|
|
}
|
|
else
|
|
{
|
|
#ifdef FT_CONFIG_OPTION_USE_ZLIB
|
|
|
|
/* Uncompress with zlib. */
|
|
FT_ULong output_len = table->OrigLength;
|
|
|
|
|
|
error = FT_Gzip_Uncompress( memory,
|
|
sfnt + table->OrigOffset, &output_len,
|
|
stream->cursor, table->CompLength );
|
|
if ( error )
|
|
goto Exit;
|
|
if ( output_len != table->OrigLength )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
goto Exit;
|
|
}
|
|
|
|
#else /* !FT_CONFIG_OPTION_USE_ZLIB */
|
|
|
|
error = FT_THROW( Unimplemented_Feature );
|
|
goto Exit;
|
|
|
|
#endif /* !FT_CONFIG_OPTION_USE_ZLIB */
|
|
}
|
|
|
|
FT_FRAME_EXIT();
|
|
|
|
/* We don't check whether the padding bytes in the WOFF file are */
|
|
/* actually '\0'. For the output, however, we do set them properly. */
|
|
sfnt_offset = table->OrigOffset + table->OrigLength;
|
|
while ( sfnt_offset & 3 )
|
|
{
|
|
sfnt[sfnt_offset] = '\0';
|
|
sfnt_offset++;
|
|
}
|
|
}
|
|
|
|
/* Ok! Finally ready. Swap out stream and return. */
|
|
FT_Stream_OpenMemory( sfnt_stream, sfnt, woff.totalSfntSize );
|
|
sfnt_stream->memory = stream->memory;
|
|
sfnt_stream->close = sfnt_stream_close;
|
|
|
|
FT_Stream_Free(
|
|
face->root.stream,
|
|
( face->root.face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) != 0 );
|
|
|
|
face->root.stream = sfnt_stream;
|
|
|
|
face->root.face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
|
|
|
|
Exit:
|
|
FT_FREE( tables );
|
|
FT_FREE( indices );
|
|
|
|
if ( error )
|
|
{
|
|
FT_FREE( sfnt );
|
|
FT_Stream_Close( sfnt_stream );
|
|
FT_FREE( sfnt_stream );
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#undef WRITE_USHORT
|
|
#undef WRITE_ULONG
|
|
|
|
|
|
/* Fill in face->ttc_header. If the font is not a TTC, it is */
|
|
/* synthesized into a TTC with one offset table. */
|
|
static FT_Error
|
|
sfnt_open_font( FT_Stream stream,
|
|
TT_Face face )
|
|
{
|
|
FT_Memory memory = stream->memory;
|
|
FT_Error error;
|
|
FT_ULong tag, offset;
|
|
|
|
static const FT_Frame_Field ttc_header_fields[] =
|
|
{
|
|
#undef FT_STRUCTURE
|
|
#define FT_STRUCTURE TTC_HeaderRec
|
|
|
|
FT_FRAME_START( 8 ),
|
|
FT_FRAME_LONG( version ),
|
|
FT_FRAME_LONG( count ), /* this is ULong in the specs */
|
|
FT_FRAME_END
|
|
};
|
|
|
|
|
|
face->ttc_header.tag = 0;
|
|
face->ttc_header.version = 0;
|
|
face->ttc_header.count = 0;
|
|
|
|
retry:
|
|
offset = FT_STREAM_POS();
|
|
|
|
if ( FT_READ_ULONG( tag ) )
|
|
return error;
|
|
|
|
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;
|
|
}
|
|
|
|
if ( tag != 0x00010000UL &&
|
|
tag != TTAG_ttcf &&
|
|
tag != TTAG_OTTO &&
|
|
tag != TTAG_true &&
|
|
tag != TTAG_typ1 &&
|
|
tag != 0x00020000UL )
|
|
{
|
|
FT_TRACE2(( " not a font using the SFNT container format\n" ));
|
|
return FT_THROW( Unknown_File_Format );
|
|
}
|
|
|
|
face->ttc_header.tag = TTAG_ttcf;
|
|
|
|
if ( tag == TTAG_ttcf )
|
|
{
|
|
FT_Int n;
|
|
|
|
|
|
FT_TRACE3(( "sfnt_open_font: file is a collection\n" ));
|
|
|
|
if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
|
|
return error;
|
|
|
|
if ( face->ttc_header.count == 0 )
|
|
return FT_THROW( Invalid_Table );
|
|
|
|
/* a rough size estimate: let's conservatively assume that there */
|
|
/* is just a single table info in each subfont header (12 + 16*1 = */
|
|
/* 28 bytes), thus we have (at least) `12 + 4*count' bytes for the */
|
|
/* size of the TTC header plus `28*count' bytes for all subfont */
|
|
/* headers */
|
|
if ( (FT_ULong)face->ttc_header.count > stream->size / ( 28 + 4 ) )
|
|
return FT_THROW( Array_Too_Large );
|
|
|
|
/* now read the offsets of each font in the file */
|
|
if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) )
|
|
return error;
|
|
|
|
if ( FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
|
|
return error;
|
|
|
|
for ( n = 0; n < face->ttc_header.count; n++ )
|
|
face->ttc_header.offsets[n] = FT_GET_ULONG();
|
|
|
|
FT_FRAME_EXIT();
|
|
}
|
|
else
|
|
{
|
|
FT_TRACE3(( "sfnt_open_font: synthesize TTC\n" ));
|
|
|
|
face->ttc_header.version = 1 << 16;
|
|
face->ttc_header.count = 1;
|
|
|
|
if ( FT_NEW( face->ttc_header.offsets ) )
|
|
return error;
|
|
|
|
face->ttc_header.offsets[0] = offset;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
FT_LOCAL_DEF( FT_Error )
|
|
sfnt_init_face( FT_Stream stream,
|
|
TT_Face face,
|
|
FT_Int face_index,
|
|
FT_Int num_params,
|
|
FT_Parameter* params )
|
|
{
|
|
FT_Error error;
|
|
FT_Library library = face->root.driver->root.library;
|
|
SFNT_Service sfnt;
|
|
|
|
|
|
/* for now, parameters are unused */
|
|
FT_UNUSED( num_params );
|
|
FT_UNUSED( params );
|
|
|
|
|
|
sfnt = (SFNT_Service)face->sfnt;
|
|
if ( !sfnt )
|
|
{
|
|
sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
|
|
if ( !sfnt )
|
|
{
|
|
FT_ERROR(( "sfnt_init_face: cannot access `sfnt' module\n" ));
|
|
return FT_THROW( Missing_Module );
|
|
}
|
|
|
|
face->sfnt = sfnt;
|
|
face->goto_table = sfnt->goto_table;
|
|
}
|
|
|
|
FT_FACE_FIND_GLOBAL_SERVICE( face, face->psnames, POSTSCRIPT_CMAPS );
|
|
|
|
FT_TRACE2(( "SFNT driver\n" ));
|
|
|
|
error = sfnt_open_font( stream, face );
|
|
if ( error )
|
|
return error;
|
|
|
|
/* Stream may have changed in sfnt_open_font. */
|
|
stream = face->root.stream;
|
|
|
|
FT_TRACE2(( "sfnt_init_face: %08p, %ld\n", face, face_index ));
|
|
|
|
if ( face_index < 0 )
|
|
face_index = 0;
|
|
|
|
if ( face_index >= face->ttc_header.count )
|
|
return FT_THROW( Invalid_Argument );
|
|
|
|
if ( FT_STREAM_SEEK( face->ttc_header.offsets[face_index] ) )
|
|
return error;
|
|
|
|
/* check that we have a valid TrueType file */
|
|
error = sfnt->load_font_dir( face, stream );
|
|
if ( error )
|
|
return error;
|
|
|
|
face->root.num_faces = face->ttc_header.count;
|
|
face->root.face_index = face_index;
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#define LOAD_( x ) \
|
|
do \
|
|
{ \
|
|
FT_TRACE2(( "`" #x "' " )); \
|
|
FT_TRACE3(( "-->\n" )); \
|
|
\
|
|
error = sfnt->load_ ## x( face, stream ); \
|
|
\
|
|
FT_TRACE2(( "%s\n", ( !error ) \
|
|
? "loaded" \
|
|
: FT_ERR_EQ( error, Table_Missing ) \
|
|
? "missing" \
|
|
: "failed to load" )); \
|
|
FT_TRACE3(( "\n" )); \
|
|
} while ( 0 )
|
|
|
|
#define LOADM_( x, vertical ) \
|
|
do \
|
|
{ \
|
|
FT_TRACE2(( "`%s" #x "' ", \
|
|
vertical ? "vertical " : "" )); \
|
|
FT_TRACE3(( "-->\n" )); \
|
|
\
|
|
error = sfnt->load_ ## x( face, stream, vertical ); \
|
|
\
|
|
FT_TRACE2(( "%s\n", ( !error ) \
|
|
? "loaded" \
|
|
: FT_ERR_EQ( error, Table_Missing ) \
|
|
? "missing" \
|
|
: "failed to load" )); \
|
|
FT_TRACE3(( "\n" )); \
|
|
} while ( 0 )
|
|
|
|
#define GET_NAME( id, field ) \
|
|
do \
|
|
{ \
|
|
error = tt_face_get_name( face, TT_NAME_ID_ ## id, field ); \
|
|
if ( error ) \
|
|
goto Exit; \
|
|
} while ( 0 )
|
|
|
|
|
|
FT_LOCAL_DEF( FT_Error )
|
|
sfnt_load_face( FT_Stream stream,
|
|
TT_Face face,
|
|
FT_Int face_index,
|
|
FT_Int num_params,
|
|
FT_Parameter* params )
|
|
{
|
|
FT_Error error;
|
|
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
|
|
FT_Error psnames_error;
|
|
#endif
|
|
FT_Bool has_outline;
|
|
FT_Bool is_apple_sbit;
|
|
FT_Bool is_apple_sbix;
|
|
FT_Bool ignore_preferred_family = FALSE;
|
|
FT_Bool ignore_preferred_subfamily = FALSE;
|
|
|
|
SFNT_Service sfnt = (SFNT_Service)face->sfnt;
|
|
|
|
FT_UNUSED( face_index );
|
|
|
|
|
|
/* Check parameters */
|
|
|
|
{
|
|
FT_Int i;
|
|
|
|
|
|
for ( i = 0; i < num_params; i++ )
|
|
{
|
|
if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_FAMILY )
|
|
ignore_preferred_family = TRUE;
|
|
else if ( params[i].tag == FT_PARAM_TAG_IGNORE_PREFERRED_SUBFAMILY )
|
|
ignore_preferred_subfamily = TRUE;
|
|
}
|
|
}
|
|
|
|
/* Load tables */
|
|
|
|
/* We now support two SFNT-based bitmapped font formats. They */
|
|
/* are recognized easily as they do not include a `glyf' */
|
|
/* table. */
|
|
/* */
|
|
/* The first format comes from Apple, and uses a table named */
|
|
/* `bhed' instead of `head' to store the font header (using */
|
|
/* the same format). It also doesn't include horizontal and */
|
|
/* vertical metrics tables (i.e. `hhea' and `vhea' tables are */
|
|
/* missing). */
|
|
/* */
|
|
/* The other format comes from Microsoft, and is used with */
|
|
/* WinCE/PocketPC. It looks like a standard TTF, except that */
|
|
/* it doesn't contain outlines. */
|
|
/* */
|
|
|
|
FT_TRACE2(( "sfnt_load_face: %08p\n\n", face ));
|
|
|
|
/* do we have outlines in there? */
|
|
#ifdef FT_CONFIG_OPTION_INCREMENTAL
|
|
has_outline = FT_BOOL( face->root.internal->incremental_interface != 0 ||
|
|
tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
|
|
tt_face_lookup_table( face, TTAG_CFF ) != 0 );
|
|
#else
|
|
has_outline = FT_BOOL( tt_face_lookup_table( face, TTAG_glyf ) != 0 ||
|
|
tt_face_lookup_table( face, TTAG_CFF ) != 0 );
|
|
#endif
|
|
|
|
is_apple_sbit = 0;
|
|
is_apple_sbix = !face->goto_table( face, TTAG_sbix, stream, 0 );
|
|
|
|
/* Apple 'sbix' color bitmaps are rendered scaled and then the 'glyf'
|
|
* outline rendered on top. We don't support that yet, so just ignore
|
|
* the 'glyf' outline and advertise it as a bitmap-only font. */
|
|
if ( is_apple_sbix )
|
|
has_outline = 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 || is_apple_sbix )
|
|
{
|
|
LOAD_( head );
|
|
if ( error )
|
|
goto Exit;
|
|
}
|
|
|
|
if ( face->header.Units_Per_EM == 0 )
|
|
{
|
|
error = FT_THROW( Invalid_Table );
|
|
|
|
goto Exit;
|
|
}
|
|
|
|
/* the following tables are often not present in embedded TrueType */
|
|
/* fonts within PDF documents, so don't check for them. */
|
|
LOAD_( maxp );
|
|
LOAD_( cmap );
|
|
|
|
/* the following tables are optional in PCL fonts -- */
|
|
/* don't check for errors */
|
|
LOAD_( name );
|
|
LOAD_( post );
|
|
|
|
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
|
|
psnames_error = error;
|
|
#endif
|
|
|
|
/* do not load the metrics headers and tables if this is an Apple */
|
|
/* sbit font file */
|
|
if ( !is_apple_sbit )
|
|
{
|
|
/* load the `hhea' and `hmtx' tables */
|
|
LOADM_( hhea, 0 );
|
|
if ( !error )
|
|
{
|
|
LOADM_( hmtx, 0 );
|
|
if ( FT_ERR_EQ( error, Table_Missing ) )
|
|
{
|
|
error = FT_THROW( Hmtx_Table_Missing );
|
|
|
|
#ifdef FT_CONFIG_OPTION_INCREMENTAL
|
|
/* If this is an incrementally loaded font and there are */
|
|
/* overriding metrics, tolerate a missing `hmtx' table. */
|
|
if ( face->root.internal->incremental_interface &&
|
|
face->root.internal->incremental_interface->funcs->
|
|
get_glyph_metrics )
|
|
{
|
|
face->horizontal.number_Of_HMetrics = 0;
|
|
error = FT_Err_Ok;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
else if ( FT_ERR_EQ( error, Table_Missing ) )
|
|
{
|
|
/* No `hhea' table necessary for SFNT Mac fonts. */
|
|
if ( face->format_tag == TTAG_true )
|
|
{
|
|
FT_TRACE2(( "This is an SFNT Mac font.\n" ));
|
|
|
|
has_outline = 0;
|
|
error = FT_Err_Ok;
|
|
}
|
|
else
|
|
{
|
|
error = FT_THROW( Horiz_Header_Missing );
|
|
|
|
#ifdef FT_CONFIG_OPTION_INCREMENTAL
|
|
/* If this is an incrementally loaded font and there are */
|
|
/* overriding metrics, tolerate a missing `hhea' table. */
|
|
if ( face->root.internal->incremental_interface &&
|
|
face->root.internal->incremental_interface->funcs->
|
|
get_glyph_metrics )
|
|
{
|
|
face->horizontal.number_Of_HMetrics = 0;
|
|
error = FT_Err_Ok;
|
|
}
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
/* try to load the `vhea' and `vmtx' tables */
|
|
LOADM_( hhea, 1 );
|
|
if ( !error )
|
|
{
|
|
LOADM_( hmtx, 1 );
|
|
if ( !error )
|
|
face->vertical_info = 1;
|
|
}
|
|
|
|
if ( error && FT_ERR_NEQ( error, Table_Missing ) )
|
|
goto Exit;
|
|
|
|
LOAD_( os2 );
|
|
if ( error )
|
|
{
|
|
/* we treat the table as missing if there are any errors */
|
|
face->os2.version = 0xFFFFU;
|
|
}
|
|
}
|
|
|
|
/* the optional tables */
|
|
|
|
/* embedded bitmap support */
|
|
if ( sfnt->load_eblc )
|
|
{
|
|
LOAD_( eblc );
|
|
if ( error )
|
|
{
|
|
/* a font which contains neither bitmaps nor outlines is */
|
|
/* still valid (although rather useless in most cases); */
|
|
/* however, you can find such stripped fonts in PDFs */
|
|
if ( FT_ERR_EQ( error, Table_Missing ) )
|
|
error = FT_Err_Ok;
|
|
else
|
|
goto Exit;
|
|
}
|
|
}
|
|
|
|
LOAD_( pclt );
|
|
if ( error )
|
|
{
|
|
if ( FT_ERR_NEQ( error, Table_Missing ) )
|
|
goto Exit;
|
|
|
|
face->pclt.Version = 0;
|
|
}
|
|
|
|
/* consider the kerning and gasp tables as optional */
|
|
LOAD_( gasp );
|
|
LOAD_( kern );
|
|
|
|
face->root.num_glyphs = face->max_profile.numGlyphs;
|
|
|
|
/* Bit 8 of the `fsSelection' field in the `OS/2' table denotes */
|
|
/* a WWS-only font face. `WWS' stands for `weight', width', and */
|
|
/* `slope', a term used by Microsoft's Windows Presentation */
|
|
/* Foundation (WPF). This flag has been introduced in version */
|
|
/* 1.5 of the OpenType specification (May 2008). */
|
|
|
|
face->root.family_name = NULL;
|
|
face->root.style_name = NULL;
|
|
if ( face->os2.version != 0xFFFFU && face->os2.fsSelection & 256 )
|
|
{
|
|
if ( !ignore_preferred_family )
|
|
GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
|
|
if ( !face->root.family_name )
|
|
GET_NAME( FONT_FAMILY, &face->root.family_name );
|
|
|
|
if ( !ignore_preferred_subfamily )
|
|
GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
|
|
if ( !face->root.style_name )
|
|
GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
|
|
}
|
|
else
|
|
{
|
|
GET_NAME( WWS_FAMILY, &face->root.family_name );
|
|
if ( !face->root.family_name && !ignore_preferred_family )
|
|
GET_NAME( PREFERRED_FAMILY, &face->root.family_name );
|
|
if ( !face->root.family_name )
|
|
GET_NAME( FONT_FAMILY, &face->root.family_name );
|
|
|
|
GET_NAME( WWS_SUBFAMILY, &face->root.style_name );
|
|
if ( !face->root.style_name && !ignore_preferred_subfamily )
|
|
GET_NAME( PREFERRED_SUBFAMILY, &face->root.style_name );
|
|
if ( !face->root.style_name )
|
|
GET_NAME( FONT_SUBFAMILY, &face->root.style_name );
|
|
}
|
|
|
|
/* now set up root fields */
|
|
{
|
|
FT_Face root = &face->root;
|
|
FT_Long flags = root->face_flags;
|
|
|
|
|
|
/*********************************************************************/
|
|
/* */
|
|
/* Compute face flags. */
|
|
/* */
|
|
if ( face->sbit_table_type == TT_SBIT_TABLE_TYPE_CBLC ||
|
|
face->sbit_table_type == TT_SBIT_TABLE_TYPE_SBIX )
|
|
flags |= FT_FACE_FLAG_COLOR; /* color glyphs */
|
|
|
|
if ( has_outline == TRUE )
|
|
flags |= FT_FACE_FLAG_SCALABLE; /* scalable outlines */
|
|
|
|
/* The sfnt driver only supports bitmap fonts natively, thus we */
|
|
/* don't set FT_FACE_FLAG_HINTER. */
|
|
flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
|
|
FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
|
|
|
|
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
|
|
if ( !psnames_error &&
|
|
face->postscript.FormatType != 0x00030000L )
|
|
flags |= FT_FACE_FLAG_GLYPH_NAMES;
|
|
#endif
|
|
|
|
/* fixed width font? */
|
|
if ( face->postscript.isFixedPitch )
|
|
flags |= FT_FACE_FLAG_FIXED_WIDTH;
|
|
|
|
/* vertical information? */
|
|
if ( face->vertical_info )
|
|
flags |= FT_FACE_FLAG_VERTICAL;
|
|
|
|
/* kerning available ? */
|
|
if ( TT_FACE_HAS_KERNING( face ) )
|
|
flags |= FT_FACE_FLAG_KERNING;
|
|
|
|
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
|
|
/* Don't bother to load the tables unless somebody asks for them. */
|
|
/* No need to do work which will (probably) not be used. */
|
|
if ( tt_face_lookup_table( face, TTAG_glyf ) != 0 &&
|
|
tt_face_lookup_table( face, TTAG_fvar ) != 0 &&
|
|
tt_face_lookup_table( face, TTAG_gvar ) != 0 )
|
|
flags |= FT_FACE_FLAG_MULTIPLE_MASTERS;
|
|
#endif
|
|
|
|
root->face_flags = flags;
|
|
|
|
/*********************************************************************/
|
|
/* */
|
|
/* Compute style flags. */
|
|
/* */
|
|
|
|
flags = 0;
|
|
if ( has_outline == TRUE && face->os2.version != 0xFFFFU )
|
|
{
|
|
/* We have an OS/2 table; use the `fsSelection' field. Bit 9 */
|
|
/* indicates an oblique font face. This flag has been */
|
|
/* introduced in version 1.5 of the OpenType specification. */
|
|
|
|
if ( face->os2.fsSelection & 512 ) /* bit 9 */
|
|
flags |= FT_STYLE_FLAG_ITALIC;
|
|
else if ( face->os2.fsSelection & 1 ) /* bit 0 */
|
|
flags |= FT_STYLE_FLAG_ITALIC;
|
|
|
|
if ( face->os2.fsSelection & 32 ) /* bit 5 */
|
|
flags |= FT_STYLE_FLAG_BOLD;
|
|
}
|
|
else
|
|
{
|
|
/* this is an old Mac font, use the header field */
|
|
|
|
if ( face->header.Mac_Style & 1 )
|
|
flags |= FT_STYLE_FLAG_BOLD;
|
|
|
|
if ( face->header.Mac_Style & 2 )
|
|
flags |= FT_STYLE_FLAG_ITALIC;
|
|
}
|
|
|
|
root->style_flags = flags;
|
|
|
|
/*********************************************************************/
|
|
/* */
|
|
/* Polish the charmaps. */
|
|
/* */
|
|
/* Try to set the charmap encoding according to the platform & */
|
|
/* encoding ID of each charmap. */
|
|
/* */
|
|
|
|
tt_face_build_cmaps( face ); /* ignore errors */
|
|
|
|
|
|
/* set the encoding fields */
|
|
{
|
|
FT_Int m;
|
|
|
|
|
|
for ( m = 0; m < root->num_charmaps; m++ )
|
|
{
|
|
FT_CharMap charmap = root->charmaps[m];
|
|
|
|
|
|
charmap->encoding = sfnt_find_encoding( charmap->platform_id,
|
|
charmap->encoding_id );
|
|
|
|
#if 0
|
|
if ( root->charmap == NULL &&
|
|
charmap->encoding == FT_ENCODING_UNICODE )
|
|
{
|
|
/* set 'root->charmap' to the first Unicode encoding we find */
|
|
root->charmap = charmap;
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
|
|
|
|
/*
|
|
* Now allocate the root array of FT_Bitmap_Size records and
|
|
* populate them. Unfortunately, it isn't possible to indicate bit
|
|
* depths in the FT_Bitmap_Size record. This is a design error.
|
|
*/
|
|
{
|
|
FT_UInt i, count;
|
|
|
|
|
|
count = face->sbit_num_strikes;
|
|
|
|
if ( count > 0 )
|
|
{
|
|
FT_Memory memory = face->root.stream->memory;
|
|
FT_UShort em_size = face->header.Units_Per_EM;
|
|
FT_Short avgwidth = face->os2.xAvgCharWidth;
|
|
FT_Size_Metrics metrics;
|
|
|
|
|
|
if ( em_size == 0 || face->os2.version == 0xFFFFU )
|
|
{
|
|
avgwidth = 1;
|
|
em_size = 1;
|
|
}
|
|
|
|
if ( FT_NEW_ARRAY( root->available_sizes, count ) )
|
|
goto Exit;
|
|
|
|
for ( i = 0; i < count; i++ )
|
|
{
|
|
FT_Bitmap_Size* bsize = root->available_sizes + i;
|
|
|
|
|
|
error = sfnt->load_strike_metrics( face, i, &metrics );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
bsize->height = (FT_Short)( metrics.height >> 6 );
|
|
bsize->width = (FT_Short)(
|
|
( avgwidth * metrics.x_ppem + em_size / 2 ) / em_size );
|
|
|
|
bsize->x_ppem = metrics.x_ppem << 6;
|
|
bsize->y_ppem = metrics.y_ppem << 6;
|
|
|
|
/* assume 72dpi */
|
|
bsize->size = metrics.y_ppem << 6;
|
|
}
|
|
|
|
root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
|
|
root->num_fixed_sizes = (FT_Int)count;
|
|
}
|
|
}
|
|
|
|
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
|
|
|
|
/* a font with no bitmaps and no outlines is scalable; */
|
|
/* it has only empty glyphs then */
|
|
if ( !FT_HAS_FIXED_SIZES( root ) && !FT_IS_SCALABLE( root ) )
|
|
root->face_flags |= FT_FACE_FLAG_SCALABLE;
|
|
|
|
|
|
/*********************************************************************/
|
|
/* */
|
|
/* Set up metrics. */
|
|
/* */
|
|
if ( FT_IS_SCALABLE( root ) )
|
|
{
|
|
/* XXX What about if outline header is missing */
|
|
/* (e.g. sfnt wrapped bitmap)? */
|
|
root->bbox.xMin = face->header.xMin;
|
|
root->bbox.yMin = face->header.yMin;
|
|
root->bbox.xMax = face->header.xMax;
|
|
root->bbox.yMax = face->header.yMax;
|
|
root->units_per_EM = face->header.Units_Per_EM;
|
|
|
|
|
|
/* XXX: Computing the ascender/descender/height is very different */
|
|
/* from what the specification tells you. Apparently, we */
|
|
/* must be careful because */
|
|
/* */
|
|
/* - not all fonts have an OS/2 table; in this case, we take */
|
|
/* the values in the horizontal header. However, these */
|
|
/* values very often are not reliable. */
|
|
/* */
|
|
/* - otherwise, the correct typographic values are in the */
|
|
/* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
|
|
/* */
|
|
/* However, certain fonts have these fields set to 0. */
|
|
/* Rather, they have usWinAscent & usWinDescent correctly */
|
|
/* set (but with different values). */
|
|
/* */
|
|
/* As an example, Arial Narrow is implemented through four */
|
|
/* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
|
|
/* */
|
|
/* Strangely, all fonts have the same values in their */
|
|
/* sTypoXXX fields, except ARIALNB which sets them to 0. */
|
|
/* */
|
|
/* On the other hand, they all have different */
|
|
/* usWinAscent/Descent values -- as a conclusion, the OS/2 */
|
|
/* table cannot be used to compute the text height reliably! */
|
|
/* */
|
|
|
|
/* The ascender and descender are taken from the `hhea' table. */
|
|
/* If zero, they are taken from the `OS/2' table. */
|
|
|
|
root->ascender = face->horizontal.Ascender;
|
|
root->descender = face->horizontal.Descender;
|
|
|
|
root->height = 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 http://www.microsoft.com/OpenType/OTSpec/post.htm -- */
|
|
/* Adjust underline position from top edge to centre of */
|
|
/* stroke to convert TrueType meaning to FreeType meaning. */
|
|
root->underline_position = face->postscript.underlinePosition -
|
|
face->postscript.underlineThickness / 2;
|
|
root->underline_thickness = face->postscript.underlineThickness;
|
|
}
|
|
|
|
}
|
|
|
|
Exit:
|
|
FT_TRACE2(( "sfnt_load_face: done\n" ));
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
#undef LOAD_
|
|
#undef LOADM_
|
|
#undef GET_NAME
|
|
|
|
|
|
FT_LOCAL_DEF( void )
|
|
sfnt_done_face( TT_Face face )
|
|
{
|
|
FT_Memory memory;
|
|
SFNT_Service sfnt;
|
|
|
|
|
|
if ( !face )
|
|
return;
|
|
|
|
memory = face->root.memory;
|
|
sfnt = (SFNT_Service)face->sfnt;
|
|
|
|
if ( sfnt )
|
|
{
|
|
/* destroy the postscript names table if it is loaded */
|
|
if ( sfnt->free_psnames )
|
|
sfnt->free_psnames( face );
|
|
|
|
/* destroy the embedded bitmaps table if it is loaded */
|
|
if ( sfnt->free_eblc )
|
|
sfnt->free_eblc( face );
|
|
}
|
|
|
|
#ifdef TT_CONFIG_OPTION_BDF
|
|
/* freeing the embedded BDF properties */
|
|
tt_face_free_bdf_props( face );
|
|
#endif
|
|
|
|
/* freeing the kerning table */
|
|
tt_face_done_kern( face );
|
|
|
|
/* freeing the collection table */
|
|
FT_FREE( face->ttc_header.offsets );
|
|
face->ttc_header.count = 0;
|
|
|
|
/* freeing table directory */
|
|
FT_FREE( face->dir_tables );
|
|
face->num_tables = 0;
|
|
|
|
{
|
|
FT_Stream stream = FT_FACE_STREAM( face );
|
|
|
|
|
|
/* simply release the 'cmap' table frame */
|
|
FT_FRAME_RELEASE( face->cmap_table );
|
|
face->cmap_size = 0;
|
|
}
|
|
|
|
/* freeing the horizontal metrics */
|
|
{
|
|
FT_Stream stream = FT_FACE_STREAM( face );
|
|
|
|
|
|
FT_FRAME_RELEASE( face->horz_metrics );
|
|
FT_FRAME_RELEASE( face->vert_metrics );
|
|
face->horz_metrics_size = 0;
|
|
face->vert_metrics_size = 0;
|
|
}
|
|
|
|
/* freeing the vertical ones, if any */
|
|
if ( face->vertical_info )
|
|
{
|
|
FT_FREE( face->vertical.long_metrics );
|
|
FT_FREE( face->vertical.short_metrics );
|
|
face->vertical_info = 0;
|
|
}
|
|
|
|
/* freeing the gasp table */
|
|
FT_FREE( face->gasp.gaspRanges );
|
|
face->gasp.numRanges = 0;
|
|
|
|
/* freeing the name table */
|
|
if ( sfnt )
|
|
sfnt->free_name( face );
|
|
|
|
/* freeing family and style name */
|
|
FT_FREE( face->root.family_name );
|
|
FT_FREE( face->root.style_name );
|
|
|
|
/* freeing sbit size table */
|
|
FT_FREE( face->root.available_sizes );
|
|
face->root.num_fixed_sizes = 0;
|
|
|
|
FT_FREE( face->postscript_name );
|
|
|
|
face->sfnt = 0;
|
|
}
|
|
|
|
|
|
/* END */
|