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|
/***************************************************************************/
/* */
/* t1driver.c */
/* */
/* Type 1 driver interface (body). */
/* */
/* Copyright 1996-2001 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include "t1driver.h"
#include "t1gload.h"
#include "t1load.h"
#include "t1errors.h"
#ifndef T1_CONFIG_OPTION_NO_AFM
#include "t1afm.h"
#endif
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_POSTSCRIPT_NAMES_H
#include <string.h> /* for strcmp() */
/*************************************************************************/
/* */
/* 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_t1driver
static FT_Error
t1_get_glyph_name( T1_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max )
{
FT_String* gname;
gname = face->type1.glyph_names[glyph_index];
if ( buffer_max > 0 )
{
FT_UInt len = (FT_UInt)( strlen( gname ) );
if (len >= buffer_max)
len = buffer_max - 1;
MEM_Copy( buffer, gname, len );
((FT_Byte*)buffer)[len] = 0;
}
return T1_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* t1_get_name_index */
/* */
/* <Description> */
/* Uses the Type 1 font's `glyph_names' table to find a given glyph */
/* name's glyph index. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* glyph_name :: The glyph name. */
/* */
/* <Return> */
/* Glyph index. 0 means `undefined character code'. */
/* */
static FT_UInt
t1_get_name_index( T1_Face face,
FT_String* glyph_name )
{
FT_Int i;
FT_String* gname;
for ( i = 0; i < face->type1.num_glyphs; i++ )
{
gname = face->type1.glyph_names[i];
if ( !strcmp( glyph_name, gname ) )
return (FT_UInt)i;
}
return 0;
}
static const char*
t1_get_ps_name( T1_Face face )
{
return (const char*) face->type1.font_name;
}
/*************************************************************************/
/* */
/* <Function> */
/* Get_Interface */
/* */
/* <Description> */
/* Each driver can provide one or more extensions to the base */
/* FreeType API. These can be used to access format specific */
/* features (e.g., all TrueType/OpenType resources share a common */
/* file structure and common tables which can be accessed through the */
/* `sfnt' interface), or more simply generic ones (e.g., the */
/* `postscript names' interface which can be used to retrieve the */
/* PostScript name of a given glyph index). */
/* */
/* <InOut> */
/* driver :: A handle to a driver object. */
/* */
/* <Input> */
/* interface :: A string designing the interface. Examples are */
/* `sfnt', `post_names', `charmaps', etc. */
/* */
/* <Return> */
/* A typeless pointer to the extension's interface (normally a table */
/* of function pointers). Returns NULL if the requested extension */
/* isn't available (i.e., wasn't compiled in the driver at build */
/* time). */
/* */
static FT_Module_Interface
Get_Interface( FT_Driver driver,
const FT_String* interface )
{
FT_UNUSED( driver );
FT_UNUSED( interface );
if ( strcmp( (const char*)interface, "glyph_name" ) == 0 )
return (FT_Module_Interface)t1_get_glyph_name;
if ( strcmp( (const char*)interface, "name_index" ) == 0 )
return (FT_Module_Interface)t1_get_name_index;
if ( strcmp( (const char*)interface, "postscript_name" ) == 0 )
return (FT_Module_Interface)t1_get_ps_name;
#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
if ( strcmp( (const char*)interface, "get_mm" ) == 0 )
return (FT_Module_Interface)T1_Get_Multi_Master;
if ( strcmp( (const char*)interface, "set_mm_design") == 0 )
return (FT_Module_Interface)T1_Set_MM_Design;
if ( strcmp( (const char*)interface, "set_mm_blend") == 0 )
return (FT_Module_Interface)T1_Set_MM_Blend;
#endif
return 0;
}
#ifndef T1_CONFIG_OPTION_NO_AFM
/*************************************************************************/
/* */
/* <Function> */
/* Get_Kerning */
/* */
/* <Description> */
/* A driver method used to return the kerning vector between two */
/* glyphs of the same face. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* left_glyph :: The index of the left glyph in the kern pair. */
/* */
/* right_glyph :: The index of the right glyph in the kern pair. */
/* */
/* <Output> */
/* kerning :: The kerning vector. This is in font units for */
/* scalable formats, and in pixels for fixed-sizes */
/* formats. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Only horizontal layouts (left-to-right & right-to-left) are */
/* supported by this function. Other layouts, or more sophisticated */
/* kernings are out of scope of this method (the basic driver */
/* interface is meant to be simple). */
/* */
/* They can be implemented by format-specific interfaces. */
/* */
static FT_Error
Get_Kerning( T1_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_Vector* kerning )
{
T1_AFM* afm;
kerning->x = 0;
kerning->y = 0;
afm = (T1_AFM*)face->afm_data;
if ( afm )
T1_Get_Kerning( afm, left_glyph, right_glyph, kerning );
return T1_Err_Ok;
}
#endif /* T1_CONFIG_OPTION_NO_AFM */
/*************************************************************************/
/* */
/* <Function> */
/* Get_Char_Index */
/* */
/* <Description> */
/* Uses a charmap to return a given character code's glyph index. */
/* */
/* <Input> */
/* charmap :: A handle to the source charmap object. */
/* charcode :: The character code. */
/* */
/* <Return> */
/* Glyph index. 0 means `undefined character code'. */
/* */
static FT_UInt
Get_Char_Index( FT_CharMap charmap,
FT_Long charcode )
{
T1_Face face;
FT_UInt result = 0;
PSNames_Service psnames;
face = (T1_Face)charmap->face;
psnames = (PSNames_Service)face->psnames;
if ( psnames )
switch ( charmap->encoding )
{
/*******************************************************************/
/* */
/* Unicode encoding support */
/* */
case ft_encoding_unicode:
/* use the `PSNames' module to synthetize the Unicode charmap */
result = psnames->lookup_unicode( &face->unicode_map,
(FT_ULong)charcode );
/* the function returns 0xFFFF if the Unicode charcode has */
/* no corresponding glyph */
if ( result == 0xFFFF )
result = 0;
goto Exit;
/*******************************************************************/
/* */
/* ISOLatin1 encoding support */
/* */
case ft_encoding_latin_1:
/* ISOLatin1 is the first page of Unicode */
if ( charcode < 256 && psnames->unicode_value )
{
result = psnames->lookup_unicode( &face->unicode_map,
(FT_ULong)charcode );
/* the function returns 0xFFFF if the Unicode charcode has */
/* no corresponding glyph */
if ( result == 0xFFFF )
result = 0;
}
goto Exit;
/*******************************************************************/
/* */
/* Custom Type 1 encoding */
/* */
case ft_encoding_adobe_custom:
{
T1_Encoding encoding = &face->type1.encoding;
if ( charcode >= encoding->code_first &&
charcode <= encoding->code_last )
result = encoding->char_index[charcode];
goto Exit;
}
/*******************************************************************/
/* */
/* Adobe Standard & Expert encoding support */
/* */
default:
if ( charcode < 256 )
{
FT_UInt code;
FT_Int n;
const char* glyph_name;
code = psnames->adobe_std_encoding[charcode];
if ( charmap->encoding == ft_encoding_adobe_expert )
code = psnames->adobe_expert_encoding[charcode];
glyph_name = psnames->adobe_std_strings( code );
if ( !glyph_name )
break;
for ( n = 0; n < face->type1.num_glyphs; n++ )
{
const char* gname = face->type1.glyph_names[n];
if ( gname && gname[0] == glyph_name[0] &&
strcmp( gname, glyph_name ) == 0 )
{
result = n;
break;
}
}
}
}
Exit:
return result;
}
/*************************************************************************/
/* */
/* <Function> */
/* Get_Next_Char */
/* */
/* <Description> */
/* Uses a charmap to return the next encoded char. */
/* */
/* <Input> */
/* charmap :: A handle to the source charmap object. */
/* charcode :: The character code. */
/* */
/* <Return> */
/* Next char code. 0 means `no more char codes'. */
/* */
static FT_Long
Get_Next_Char( FT_CharMap charmap,
FT_Long charcode )
{
T1_Face face;
PSNames_Service psnames;
face = (T1_Face)charmap->face;
psnames = (PSNames_Service)face->psnames;
if ( psnames )
switch ( charmap->encoding )
{
/*******************************************************************/
/* */
/* Unicode encoding support */
/* */
case ft_encoding_unicode:
/* use the `PSNames' module to synthetize the Unicode charmap */
return psnames->next_unicode( &face->unicode_map,
(FT_ULong)charcode );
/*******************************************************************/
/* */
/* ISOLatin1 encoding support */
/* */
case ft_encoding_latin_1:
{
FT_Long code;
/* use the `PSNames' module to synthetize the Unicode charmap */
code = psnames->next_unicode( &face->unicode_map,
(FT_ULong)charcode );
if ( code < 256 )
return code;
break;
}
/*******************************************************************/
/* */
/* Custom Type 1 encoding */
/* */
case ft_encoding_adobe_custom:
{
T1_Encoding encoding = &face->type1.encoding;
charcode++;
if ( charcode < encoding->code_first )
charcode = encoding->code_first;
while ( charcode <= encoding->code_last )
{
if ( encoding->char_index[charcode] )
return charcode;
charcode++;
}
}
/*******************************************************************/
/* */
/* Adobe Standard & Expert encoding support */
/* */
default:
while ( ++charcode < 256 )
{
FT_UInt code;
FT_Int n;
const char* glyph_name;
code = psnames->adobe_std_encoding[charcode];
if ( charmap->encoding == ft_encoding_adobe_expert )
code = psnames->adobe_expert_encoding[charcode];
glyph_name = psnames->adobe_std_strings( code );
if ( !glyph_name )
continue;
for ( n = 0; n < face->type1.num_glyphs; n++ )
{
const char* gname = face->type1.glyph_names[n];
if ( gname && gname[0] == glyph_name[0] &&
strcmp( gname, glyph_name ) == 0 )
return charcode;
}
}
}
return 0;
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_Class t1_driver_class =
{
{
ft_module_font_driver |
ft_module_driver_scalable |
ft_module_driver_has_hinter,
sizeof( FT_DriverRec ),
"type1",
0x10000L,
0x20000L,
0, /* format interface */
(FT_Module_Constructor)T1_Driver_Init,
(FT_Module_Destructor) T1_Driver_Done,
(FT_Module_Requester) Get_Interface,
},
sizeof( T1_FaceRec ),
sizeof( T1_SizeRec ),
sizeof( T1_GlyphSlotRec ),
(FTDriver_initFace) T1_Face_Init,
(FTDriver_doneFace) T1_Face_Done,
(FTDriver_initSize) T1_Size_Init,
(FTDriver_doneSize) T1_Size_Done,
(FTDriver_initGlyphSlot)T1_GlyphSlot_Init,
(FTDriver_doneGlyphSlot)T1_GlyphSlot_Done,
(FTDriver_setCharSizes) T1_Size_Reset,
(FTDriver_setPixelSizes)T1_Size_Reset,
(FTDriver_loadGlyph) T1_Load_Glyph,
(FTDriver_getCharIndex) Get_Char_Index,
#ifdef T1_CONFIG_OPTION_NO_AFM
(FTDriver_getKerning) 0,
(FTDriver_attachFile) 0,
#else
(FTDriver_getKerning) Get_Kerning,
(FTDriver_attachFile) T1_Read_AFM,
#endif
(FTDriver_getAdvances) 0,
(FTDriver_getNextChar) Get_Next_Char
};
#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
/*************************************************************************/
/* */
/* <Function> */
/* getDriverClass */
/* */
/* <Description> */
/* This function is used when compiling the TrueType driver as a */
/* shared library (`.DLL' or `.so'). It will be used by the */
/* high-level library of FreeType to retrieve the address of the */
/* driver's generic interface. */
/* */
/* It shouldn't be implemented in a static build, as each driver must */
/* have the same function as an exported entry point. */
/* */
/* <Return> */
/* The address of the TrueType's driver generic interface. The */
/* format-specific interface can then be retrieved through the method */
/* interface->get_format_interface. */
/* */
FT_EXPORT_DEF( const FT_Driver_Class* )
getDriverClass( void )
{
return &t1_driver_class;
}
#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */
/* END */
|
