forked from minhngoc25a/freetype2
477 lines
17 KiB
C
477 lines
17 KiB
C
/***************************************************************************/
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/* */
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/* t2objs.c */
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/* */
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/* OpenType objects manager (body). */
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/* */
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/* Copyright 1996-2000 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 <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftcalc.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/fterrors.h>
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#include <freetype/ttnameid.h>
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#include <freetype/tttags.h>
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#include <freetype/internal/sfnt.h>
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#include <freetype/internal/psnames.h>
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#ifdef FT_FLAT_COMPILE
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#include "t2objs.h"
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#include "t2load.h"
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#else
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#include <cff/t2objs.h>
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#include <cff/t2load.h>
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#endif
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#include <freetype/internal/t2errors.h>
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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_t2objs
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/*************************************************************************/
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/* */
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/* FACE FUNCTIONS */
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/* */
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/*************************************************************************/
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static
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FT_String* T2_StrCopy( FT_Memory memory, const FT_String* source )
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{
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FT_Error error;
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FT_String* result = 0;
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FT_Int len = (FT_Int)strlen(source);
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if ( !ALLOC( result, len+1 ) )
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{
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MEM_Copy( result, source, len );
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result[len] = 0;
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}
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return result;
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}
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/* this function is used to build a Unicode charmap from the glyph names */
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/* in a file.. */
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static
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FT_Error CFF_Build_Unicode_Charmap( T2_Face face,
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FT_ULong base_offset,
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PSNames_Interface* psnames )
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{
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CFF_Font* font = (CFF_Font*)face->extra.data;
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FT_Memory memory = FT_FACE_MEMORY(face);
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FT_UInt n, num_glyphs = face->root.num_glyphs;
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const char** glyph_names;
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FT_Error error;
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CFF_Font_Dict* dict = &font->top_font.font_dict;
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FT_ULong charset_offset;
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FT_Byte format;
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FT_Stream stream = face->root.stream;
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charset_offset = dict->charset_offset;
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if (!charset_offset)
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{
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FT_ERROR(( "CFF.Build_Unicode_Charmap: charset table is missing\n" ));
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error = FT_Err_Invalid_File_Format;
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goto Exit;
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}
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/* seek to charset table and allocate glyph names table */
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if ( FILE_Seek( base_offset + charset_offset ) ||
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ALLOC_ARRAY( glyph_names, num_glyphs, const char* ) )
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goto Exit;
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/* now, read each glyph name and store it in the glyph name table */
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if ( READ_Byte(format) )
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goto Fail;
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switch (format)
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{
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case 0: /* format 0 - one SID per glyph */
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{
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const char** gname = glyph_names;
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const char** limit = gname + num_glyphs;
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if ( ACCESS_Frame( num_glyphs*2 ) )
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goto Fail;
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for ( ; gname < limit; gname++ )
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gname[0] = T2_Get_String( &font->string_index,
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GET_UShort(),
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psnames );
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FORGET_Frame();
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break;
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}
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case 1: /* format 1 - sequential ranges */
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case 2: /* format 2 - sequential ranges with 16-bit counts */
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{
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const char** gname = glyph_names;
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const char** limit = gname + num_glyphs;
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FT_UInt len = 3;
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if (format == 2)
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len++;
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while (gname < limit)
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{
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FT_UInt first;
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FT_UInt count;
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if ( ACCESS_Frame( len ) )
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goto Fail;
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first = GET_UShort();
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if (format == 3)
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count = GET_UShort();
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else
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count = GET_Byte();
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FORGET_Frame();
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for ( ; count > 0; count-- )
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{
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gname[0] = T2_Get_String( &font->string_index,
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first,
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psnames );
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gname++;
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first++;
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}
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}
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break;
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}
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default: /* unknown charset format !! */
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FT_ERROR(( "CFF: unknown charset format !!\n" ));
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error = FT_Err_Invalid_File_Format;
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goto Fail;
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}
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/* all right, the glyph names were loaded, we now need to create */
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/* the corresponding unicode charmap.. */
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Fail:
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for ( n = 0; n < num_glyphs; n++ )
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FREE( glyph_names[n] );
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FREE( glyph_names );
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Exit:
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Init_Face */
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/* */
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/* <Description> */
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/* Initializes a given OpenType face object. */
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/* */
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/* <Input> */
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/* stream :: The source font stream. */
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/* */
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/* face_index :: The index of the font face in the resource. */
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/* */
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/* num_params :: Number of additional generic parameters. Ignored. */
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/* */
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/* params :: Additional generic parameters. Ignored. */
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/* */
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/* <InOut> */
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/* face :: The newly built face object. */
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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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LOCAL_DEF
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FT_Error T2_Init_Face( FT_Stream stream,
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T2_Face face,
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FT_Int face_index,
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FT_Int num_params,
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FT_Parameter* params )
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{
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FT_Error error;
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SFNT_Interface* sfnt;
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PSNames_Interface* psnames;
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FT_Bool pure_cff = 1;
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FT_Bool sfnt_format = 0;
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sfnt = (SFNT_Interface*)FT_Get_Module_Interface(
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face->root.driver->root.library, "sfnt" );
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if ( !sfnt )
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goto Bad_Format;
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psnames = (PSNames_Interface*)FT_Get_Module_Interface(
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face->root.driver->root.library, "psnames" );
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/* create input stream from resource */
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if ( FILE_Seek( 0 ) )
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goto Exit;
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/* check that we have a valid OpenType file */
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error = sfnt->init_face( stream, face, face_index, num_params, params );
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if ( !error )
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{
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if ( face->format_tag != 0x4F54544FL ) /* `OTTO'; OpenType/CFF font */
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{
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FT_TRACE2(( "[not a valid OpenType/CFF font]\n" ));
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goto Bad_Format;
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}
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/* If we are performing a simple font format check, exit immediately */
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if ( face_index < 0 )
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return T2_Err_Ok;
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sfnt_format = 1;
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/* now, the font can be either an OpenType/CFF font, or a SVG CEF font */
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/* in the later case, it doesn't have a "head" table.. */
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error = face->goto_table( face, TTAG_head, stream, 0 );
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if (!error)
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{
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pure_cff = 0;
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/* Load font directory */
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error = sfnt->load_face( stream, face, face_index, num_params, params );
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if ( error )
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goto Exit;
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}
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else
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{
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/* load the "cmap" table by hand */
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error = sfnt->load_charmaps( face, stream );
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if (error)
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goto Exit;
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/* XXX: for now, we don't load the GPOS table, as OpenType Layout */
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/* support will be added later to FreeType 2 as a separate module */
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}
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/* now, load the CFF part of the file */
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error = face->goto_table( face, TTAG_CFF, stream, 0 );
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if ( error )
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goto Exit;
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}
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else
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{
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/* rewind to start of file, we're going to load a pure-CFF font */
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(void)FILE_Seek(0);
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error = FT_Err_Ok;
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}
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/* now load and parse the CFF table in the file */
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{
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CFF_Font* cff;
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FT_Memory memory = face->root.memory;
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FT_Face root;
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FT_UInt flags;
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if ( ALLOC( cff, sizeof ( *cff ) ) )
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goto Exit;
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face->extra.data = cff;
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error = T2_Load_CFF_Font( stream, face_index, cff );
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if ( error )
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goto Exit;
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/* Complement the root flags with some interesting information. */
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/* Note that this is only necessary for pure CFF and CEF fonts */
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root = &face->root;
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if (pure_cff)
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{
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CFF_Font_Dict* dict = &cff->top_font.font_dict;
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/* we need the psnames module for pure-CFF and CEF formats */
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if (!psnames)
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{
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FT_ERROR(( "cannot open CFF & CEF fonts without the 'psnames' module\n" ));
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goto Bad_Format;
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}
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/* retrieve font family & style name */
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if (dict->cid_registry)
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{
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root->family_name = T2_Get_String( &cff->string_index,
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dict->cid_font_name,
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psnames );
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root->style_name = T2_StrCopy( memory, "Regular" ); /* XXXX */
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}
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else
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{
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root->family_name = T2_Get_String( &cff->string_index,
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dict->base_font_name,
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psnames );
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root->style_name = T2_Get_String( &cff->string_index,
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dict->weight,
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psnames );
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}
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/*********************************************************************/
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/* */
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/* Compute face flags. */
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/* */
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flags = FT_FACE_FLAG_SCALABLE | /* scalable outlines */
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FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
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if (sfnt_format)
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flags |= FT_FACE_FLAG_SFNT;
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/* fixed width font? */
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if ( dict->is_fixed_pitch )
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flags |= FT_FACE_FLAG_FIXED_WIDTH;
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/* XXXX: WE DO NOT SUPPORT KERNING METRICS IN THE GPOS TABLE FOR NOW */
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#if 0
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/* kerning available ? */
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if ( face->kern_pairs )
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flags |= FT_FACE_FLAG_KERNING;
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#endif
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root->face_flags = flags;
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/*********************************************************************/
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/* */
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/* Compute style flags. */
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/* */
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flags = 0;
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if ( dict->italic_angle )
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flags |= FT_STYLE_FLAG_ITALIC;
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/* XXXX : may not be correct .. */
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if ( cff->top_font.private_dict.force_bold )
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flags |= FT_STYLE_FLAG_BOLD;
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root->style_flags = flags;
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}
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}
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Exit:
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return error;
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Bad_Format:
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Done_Face */
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/* */
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/* <Description> */
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/* Finalizes a given face object. */
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/* */
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/* <Input> */
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/* face :: A pointer to the face object to destroy. */
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/* */
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LOCAL_DEF
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void T2_Done_Face( T2_Face face )
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{
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FT_Memory memory = face->root.memory;
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SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
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if ( sfnt )
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sfnt->done_face( face );
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{
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CFF_Font* cff = (CFF_Font*)face->extra.data;
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if ( cff )
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{
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T2_Done_CFF_Font( cff );
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FREE( face->extra.data );
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}
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}
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Init_Driver */
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/* */
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/* <Description> */
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/* Initializes a given OpenType driver object. */
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/* */
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/* <Input> */
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/* driver :: A handle to the target driver object. */
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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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LOCAL_FUNC
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FT_Error T2_Init_Driver( T2_Driver driver )
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{
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/* init extension registry if needed */
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#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
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return TT_Init_Extensions( driver );
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#else
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FT_UNUSED( driver );
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return T2_Err_Ok;
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#endif
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* T2_Done_Driver */
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/* */
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/* <Description> */
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/* Finalizes a given OpenType driver. */
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/* */
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/* <Input> */
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/* driver :: A handle to the target OpenType driver. */
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/* */
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LOCAL_FUNC
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void T2_Done_Driver( T2_Driver driver )
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{
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/* destroy extensions registry if needed */
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#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
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TT_Done_Extensions( driver );
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#else
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FT_UNUSED( driver );
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#endif
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}
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/* END */
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