?? t42parse.c
字號:
/***************************************************************************/
/* */
/* t42parse.c */
/* */
/* Type 42 font parser (body). */
/* */
/* Copyright 2002, 2003, 2004, 2005, 2006 by Roberto Alameda. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include "t42parse.h"
#include "t42error.h"
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_LIST_H
#include FT_INTERNAL_POSTSCRIPT_AUX_H
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_t42
static void
t42_parse_font_matrix( T42_Face face,
T42_Loader loader );
static void
t42_parse_encoding( T42_Face face,
T42_Loader loader );
static void
t42_parse_charstrings( T42_Face face,
T42_Loader loader );
static void
t42_parse_sfnts( T42_Face face,
T42_Loader loader );
static const
T1_FieldRec t42_keywords[] = {
#undef FT_STRUCTURE
#define FT_STRUCTURE T1_FontInfo
#undef T1CODE
#define T1CODE T1_FIELD_LOCATION_FONT_INFO
T1_FIELD_STRING( "version", version )
T1_FIELD_STRING( "Notice", notice )
T1_FIELD_STRING( "FullName", full_name )
T1_FIELD_STRING( "FamilyName", family_name )
T1_FIELD_STRING( "Weight", weight )
T1_FIELD_NUM ( "ItalicAngle", italic_angle )
T1_FIELD_BOOL ( "isFixedPitch", is_fixed_pitch )
T1_FIELD_NUM ( "UnderlinePosition", underline_position )
T1_FIELD_NUM ( "UnderlineThickness", underline_thickness )
#undef FT_STRUCTURE
#define FT_STRUCTURE T1_FontRec
#undef T1CODE
#define T1CODE T1_FIELD_LOCATION_FONT_DICT
T1_FIELD_KEY ( "FontName", font_name )
T1_FIELD_NUM ( "PaintType", paint_type )
T1_FIELD_NUM ( "FontType", font_type )
T1_FIELD_FIXED( "StrokeWidth", stroke_width )
#undef FT_STRUCTURE
#define FT_STRUCTURE FT_BBox
#undef T1CODE
#define T1CODE T1_FIELD_LOCATION_BBOX
T1_FIELD_BBOX("FontBBox", xMin )
T1_FIELD_CALLBACK( "FontMatrix", t42_parse_font_matrix )
T1_FIELD_CALLBACK( "Encoding", t42_parse_encoding )
T1_FIELD_CALLBACK( "CharStrings", t42_parse_charstrings )
T1_FIELD_CALLBACK( "sfnts", t42_parse_sfnts )
{ 0, T1_FIELD_LOCATION_CID_INFO, T1_FIELD_TYPE_NONE, 0, 0, 0, 0, 0 }
};
#define T1_Add_Table( p, i, o, l ) (p)->funcs.add( (p), i, o, l )
#define T1_Done_Table( p ) \
do \
{ \
if ( (p)->funcs.done ) \
(p)->funcs.done( p ); \
} while ( 0 )
#define T1_Release_Table( p ) \
do \
{ \
if ( (p)->funcs.release ) \
(p)->funcs.release( p ); \
} while ( 0 )
#define T1_Skip_Spaces( p ) (p)->root.funcs.skip_spaces( &(p)->root )
#define T1_Skip_PS_Token( p ) (p)->root.funcs.skip_PS_token( &(p)->root )
#define T1_ToInt( p ) \
(p)->root.funcs.to_int( &(p)->root )
#define T1_ToBytes( p, b, m, n, d ) \
(p)->root.funcs.to_bytes( &(p)->root, b, m, n, d )
#define T1_ToFixedArray( p, m, f, t ) \
(p)->root.funcs.to_fixed_array( &(p)->root, m, f, t )
#define T1_ToToken( p, t ) \
(p)->root.funcs.to_token( &(p)->root, t )
#define T1_Load_Field( p, f, o, m, pf ) \
(p)->root.funcs.load_field( &(p)->root, f, o, m, pf )
#define T1_Load_Field_Table( p, f, o, m, pf ) \
(p)->root.funcs.load_field_table( &(p)->root, f, o, m, pf )
/********************* Parsing Functions ******************/
FT_LOCAL_DEF( FT_Error )
t42_parser_init( T42_Parser parser,
FT_Stream stream,
FT_Memory memory,
PSAux_Service psaux )
{
FT_Error error = T42_Err_Ok;
FT_Long size;
psaux->ps_parser_funcs->init( &parser->root, 0, 0, memory );
parser->stream = stream;
parser->base_len = 0;
parser->base_dict = 0;
parser->in_memory = 0;
/*******************************************************************/
/* */
/* Here a short summary of what is going on: */
/* */
/* When creating a new Type 42 parser, we try to locate and load */
/* the base dictionary, loading the whole font into memory. */
/* */
/* When `loading' the base dictionary, we only set up pointers */
/* in the case of a memory-based stream. Otherwise, we allocate */
/* and load the base dictionary in it. */
/* */
/* parser->in_memory is set if we have a memory stream. */
/* */
if ( FT_STREAM_SEEK( 0L ) ||
FT_FRAME_ENTER( 17 ) )
goto Exit;
if ( ft_memcmp( stream->cursor, "%!PS-TrueTypeFont", 17 ) != 0 )
{
FT_TRACE2(( "not a Type42 font\n" ));
error = T42_Err_Unknown_File_Format;
}
FT_FRAME_EXIT();
if ( error || FT_STREAM_SEEK( 0 ) )
goto Exit;
size = stream->size;
/* now, try to load `size' bytes of the `base' dictionary we */
/* found previously */
/* if it is a memory-based resource, set up pointers */
if ( !stream->read )
{
parser->base_dict = (FT_Byte*)stream->base + stream->pos;
parser->base_len = size;
parser->in_memory = 1;
/* check that the `size' field is valid */
if ( FT_STREAM_SKIP( size ) )
goto Exit;
}
else
{
/* read segment in memory */
if ( FT_ALLOC( parser->base_dict, size ) ||
FT_STREAM_READ( parser->base_dict, size ) )
goto Exit;
parser->base_len = size;
}
parser->root.base = parser->base_dict;
parser->root.cursor = parser->base_dict;
parser->root.limit = parser->root.cursor + parser->base_len;
Exit:
if ( error && !parser->in_memory )
FT_FREE( parser->base_dict );
return error;
}
FT_LOCAL_DEF( void )
t42_parser_done( T42_Parser parser )
{
FT_Memory memory = parser->root.memory;
/* free the base dictionary only when we have a disk stream */
if ( !parser->in_memory )
FT_FREE( parser->base_dict );
parser->root.funcs.done( &parser->root );
}
static int
t42_is_space( FT_Byte c )
{
return ( c == ' ' || c == '\t' ||
c == '\r' || c == '\n' || c == '\f' ||
c == '\0' );
}
static void
t42_parse_font_matrix( T42_Face face,
T42_Loader loader )
{
T42_Parser parser = &loader->parser;
FT_Matrix* matrix = &face->type1.font_matrix;
FT_Vector* offset = &face->type1.font_offset;
FT_Face root = (FT_Face)&face->root;
FT_Fixed temp[6];
FT_Fixed temp_scale;
(void)T1_ToFixedArray( parser, 6, temp, 3 );
temp_scale = FT_ABS( temp[3] );
/* Set Units per EM based on FontMatrix values. We set the value to */
/* 1000 / temp_scale, because temp_scale was already multiplied by */
/* 1000 (in t1_tofixed, from psobjs.c). */
root->units_per_EM = (FT_UShort)( FT_DivFix( 1000 * 0x10000L,
temp_scale ) >> 16 );
/* we need to scale the values by 1.0/temp_scale */
if ( temp_scale != 0x10000L ) {
temp[0] = FT_DivFix( temp[0], temp_scale );
temp[1] = FT_DivFix( temp[1], temp_scale );
temp[2] = FT_DivFix( temp[2], temp_scale );
temp[4] = FT_DivFix( temp[4], temp_scale );
temp[5] = FT_DivFix( temp[5], temp_scale );
temp[3] = 0x10000L;
}
matrix->xx = temp[0];
matrix->yx = temp[1];
matrix->xy = temp[2];
matrix->yy = temp[3];
/* note that the offsets must be expressed in integer font units */
offset->x = temp[4] >> 16;
offset->y = temp[5] >> 16;
}
static void
t42_parse_encoding( T42_Face face,
T42_Loader loader )
{
T42_Parser parser = &loader->parser;
FT_Byte* cur;
FT_Byte* limit = parser->root.limit;
PSAux_Service psaux = (PSAux_Service)face->psaux;
T1_Skip_Spaces( parser );
cur = parser->root.cursor;
if ( cur >= limit )
{
FT_ERROR(( "t42_parse_encoding: out of bounds!\n" ));
parser->root.error = T42_Err_Invalid_File_Format;
return;
}
/* if we have a number or `[', the encoding is an array, */
/* and we must load it now */
if ( ft_isdigit( *cur ) || *cur == '[' )
{
T1_Encoding encode = &face->type1.encoding;
FT_UInt count, n;
PS_Table char_table = &loader->encoding_table;
FT_Memory memory = parser->root.memory;
FT_Error error;
FT_Bool only_immediates = 0;
/* read the number of entries in the encoding; should be 256 */
if ( *cur == '[' )
{
count = 256;
only_immediates = 1;
parser->root.cursor++;
}
else
count = (FT_UInt)T1_ToInt( parser );
T1_Skip_Spaces( parser );
if ( parser->root.cursor >= limit )
return;
/* we use a T1_Table to store our charnames */
loader->num_chars = encode->num_chars = count;
if ( FT_NEW_ARRAY( encode->char_index, count ) ||
FT_NEW_ARRAY( encode->char_name, count ) ||
FT_SET_ERROR( psaux->ps_table_funcs->init(
char_table, count, memory ) ) )
{
parser->root.error = error;
return;
}
/* We need to `zero' out encoding_table.elements */
for ( n = 0; n < count; n++ )
{
char* notdef = (char *)".notdef";
T1_Add_Table( char_table, n, notdef, 8 );
}
/* Now we need to read records of the form */
/* */
/* ... charcode /charname ... */
/* */
/* for each entry in our table. */
/* */
/* We simply look for a number followed by an immediate */
/* name. Note that this ignores correctly the sequence */
/* that is often seen in type42 fonts: */
/* */
/* 0 1 255 { 1 index exch /.notdef put } for dup */
/* */
/* used to clean the encoding array before anything else. */
/* */
/* Alternatively, if the array is directly given as */
/* */
/* /Encoding [ ... ] */
/* */
/* we only read immediates. */
n = 0;
T1_Skip_Spaces( parser );
while ( parser->root.cursor < limit )
{
cur = parser->root.cursor;
/* we stop when we encounter `def' or `]' */
if ( *cur == 'd' && cur + 3 < limit )
{
if ( cur[1] == 'e' &&
cur[2] == 'f' &&
t42_is_space( cur[3] ) )
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -