ref: 32b85e67cbfd1fe2824af80be296a0c263d42455
dir: /src/type1z/z1driver.c/
/*******************************************************************
*
* t1driver.c
*
* High-level Type1 driver interface for FreeType 2.0
*
* Copyright 1996-1998 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 <z1driver.h>
#include <z1gload.h>
#include <z1load.h>
#include <z1afm.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/psnames.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1driver
/*************************************************************************/
/* */
/* <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 )
{
UNUSED(driver);
UNUSED(interface);
#ifndef Z1_CONFIG_OPTION_NO_MM_SUPPORT
if ( strcmp( (const char*)interface, "get_mm" ) == 0 )
return (FT_Module_Interface)Z1_Get_Multi_Master;
if ( strcmp( (const char*)interface, "set_mm_design") == 0 )
return (FT_Module_Interface)Z1_Set_MM_Design;
if ( strcmp( (const char*)interface, "set_mm_blend") == 0 )
return (FT_Module_Interface)Z1_Set_MM_Blend;
#endif
return 0;
}
#ifndef Z1_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 )
{
Z1_AFM* afm;
kerning->x = 0;
kerning->y = 0;
afm = (Z1_AFM*)face->afm_data;
if (afm)
Z1_Get_Kerning( afm, left_glyph, right_glyph, kerning );
return T1_Err_Ok;
}
#endif
/*************************************************************************/
/* */
/* <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_Interface* psnames;
face = (T1_Face)charmap->face;
psnames = (PSNames_Interface*)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 when 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;
}
const FT_Driver_Class t1z_driver_class =
{
{
ft_module_font_driver | ft_module_driver_scalable,
sizeof( FT_DriverRec ),
"type1z",
0x10000,
0x20000,
0, /* format interface */
(FT_Module_Constructor) Z1_Init_Driver,
(FT_Module_Destructor) Z1_Done_Driver,
(FT_Module_Requester) Get_Interface,
},
sizeof( T1_FaceRec ),
sizeof( Z1_SizeRec ),
sizeof( Z1_GlyphSlotRec ),
(FTDriver_initFace) Z1_Init_Face,
(FTDriver_doneFace) Z1_Done_Face,
(FTDriver_initSize) 0,
(FTDriver_doneSize) 0,
(FTDriver_initGlyphSlot) 0,
(FTDriver_doneGlyphSlot) 0,
(FTDriver_setCharSizes) 0,
(FTDriver_setPixelSizes) 0,
(FTDriver_loadGlyph) Z1_Load_Glyph,
(FTDriver_getCharIndex) Get_Char_Index,
#ifdef Z1_CONFIG_OPTION_NO_AFM
(FTDriver_getKerning) 0,
(FTDriver_attachFile) 0,
#else
(FTDriver_getKerning) Get_Kerning,
(FTDriver_attachFile) Z1_Read_AFM,
#endif
(FTDriver_getAdvances) 0
};
/******************************************************************/
/* */
/* <Function> Get_FreeType_Driver_Interface */
/* */
/* <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> */
/* address of TrueType's driver generic interface. The */
/* forma-specific interface can then be retrieved through */
/* the method interface->get_format_interface.. */
/* */
#ifdef FT_CONFIG_OPTION_DYNAMIC_DRIVERS
EXPORT_FUNC(const FT_Driver_Class*) getDriverClass( void )
{
return &t1z_driver_class;
}
#endif /* FT_CONFIG_OPTION_DYNAMIC_DRIVERS */