278 lines
11 KiB
C
278 lines
11 KiB
C
/***************************************************************************/
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/* */
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/* t1driver.c */
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/* */
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/* Type 1 driver interface (body). */
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/* */
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/* Copyright 1996-2001, 2002 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 "t1driver.h"
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#include "t1gload.h"
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#include "t1load.h"
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#include "t1errors.h"
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#ifndef T1_CONFIG_OPTION_NO_AFM
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#include "t1afm.h"
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#endif
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_POSTSCRIPT_NAMES_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_t1driver
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static FT_Error
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t1_get_glyph_name( T1_Face face,
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FT_UInt glyph_index,
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FT_Pointer buffer,
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FT_UInt buffer_max )
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{
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FT_String* gname;
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gname = face->type1.glyph_names[glyph_index];
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if ( buffer_max > 0 )
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{
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FT_UInt len = (FT_UInt)( ft_strlen( gname ) );
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if (len >= buffer_max)
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len = buffer_max - 1;
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FT_MEM_COPY( buffer, gname, len );
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((FT_Byte*)buffer)[len] = 0;
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}
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return T1_Err_Ok;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* t1_get_name_index */
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/* */
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/* <Description> */
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/* Uses the Type 1 font's `glyph_names' table to find a given glyph */
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/* name's glyph index. */
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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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/* glyph_name :: The glyph name. */
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/* */
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/* <Return> */
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/* Glyph index. 0 means `undefined character code'. */
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/* */
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static FT_UInt
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t1_get_name_index( T1_Face face,
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FT_String* glyph_name )
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{
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FT_Int i;
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FT_String* gname;
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for ( i = 0; i < face->type1.num_glyphs; i++ )
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{
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gname = face->type1.glyph_names[i];
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if ( !ft_strcmp( glyph_name, gname ) )
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return (FT_UInt)i;
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}
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return 0;
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}
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static const char*
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t1_get_ps_name( T1_Face face )
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{
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return (const char*) face->type1.font_name;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* Get_Interface */
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/* */
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/* <Description> */
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/* Each driver can provide one or more extensions to the base */
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/* FreeType API. These can be used to access format specific */
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/* features (e.g., all TrueType/OpenType resources share a common */
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/* file structure and common tables which can be accessed through the */
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/* `sfnt' interface), or more simply generic ones (e.g., the */
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/* `postscript names' interface which can be used to retrieve the */
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/* PostScript name of a given glyph index). */
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/* */
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/* <InOut> */
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/* driver :: A handle to a driver object. */
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/* */
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/* <Input> */
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/* t1_interface :: A string designing the interface. Examples are */
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/* `sfnt', `post_names', `charmaps', etc. */
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/* */
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/* <Return> */
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/* A typeless pointer to the extension's interface (normally a table */
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/* of function pointers). Returns NULL if the requested extension */
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/* isn't available (i.e., wasn't compiled in the driver at build */
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/* time). */
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/* */
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static FT_Module_Interface
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Get_Interface( FT_Driver driver,
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const FT_String* t1_interface )
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{
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FT_UNUSED( driver );
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FT_UNUSED( t1_interface );
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if ( ft_strcmp( (const char*)t1_interface, "glyph_name" ) == 0 )
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return (FT_Module_Interface)t1_get_glyph_name;
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if ( ft_strcmp( (const char*)t1_interface, "name_index" ) == 0 )
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return (FT_Module_Interface)t1_get_name_index;
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if ( ft_strcmp( (const char*)t1_interface, "postscript_name" ) == 0 )
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return (FT_Module_Interface)t1_get_ps_name;
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#ifndef T1_CONFIG_OPTION_NO_MM_SUPPORT
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if ( ft_strcmp( (const char*)t1_interface, "get_mm" ) == 0 )
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return (FT_Module_Interface)T1_Get_Multi_Master;
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if ( ft_strcmp( (const char*)t1_interface, "set_mm_design") == 0 )
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return (FT_Module_Interface)T1_Set_MM_Design;
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if ( ft_strcmp( (const char*)t1_interface, "set_mm_blend") == 0 )
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return (FT_Module_Interface)T1_Set_MM_Blend;
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#endif
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return 0;
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}
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#ifndef T1_CONFIG_OPTION_NO_AFM
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/*************************************************************************/
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/* */
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/* <Function> */
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/* Get_Kerning */
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/* */
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/* <Description> */
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/* A driver method used to return the kerning vector between two */
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/* glyphs of the same face. */
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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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/* left_glyph :: The index of the left glyph in the kern pair. */
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/* */
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/* right_glyph :: The index of the right glyph in the kern pair. */
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/* */
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/* <Output> */
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/* kerning :: The kerning vector. This is in font units for */
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/* scalable formats, and in pixels for fixed-sizes */
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/* formats. */
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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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/* <Note> */
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/* Only horizontal layouts (left-to-right & right-to-left) are */
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/* supported by this function. Other layouts, or more sophisticated */
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/* kernings are out of scope of this method (the basic driver */
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/* interface is meant to be simple). */
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/* */
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/* They can be implemented by format-specific interfaces. */
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/* */
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static FT_Error
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Get_Kerning( T1_Face face,
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FT_UInt left_glyph,
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FT_UInt right_glyph,
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FT_Vector* kerning )
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{
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T1_AFM* afm;
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kerning->x = 0;
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kerning->y = 0;
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afm = (T1_AFM*)face->afm_data;
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if ( afm )
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T1_Get_Kerning( afm, left_glyph, right_glyph, kerning );
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return T1_Err_Ok;
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}
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#endif /* T1_CONFIG_OPTION_NO_AFM */
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FT_CALLBACK_TABLE_DEF
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const FT_Driver_ClassRec t1_driver_class =
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{
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{
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FT_MODULE_FONT_DRIVER |
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FT_MODULE_DRIVER_SCALABLE |
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FT_MODULE_DRIVER_HAS_HINTER,
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sizeof( FT_DriverRec ),
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"type1",
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0x10000L,
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0x20000L,
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0, /* format interface */
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(FT_Module_Constructor)T1_Driver_Init,
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(FT_Module_Destructor) T1_Driver_Done,
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(FT_Module_Requester) Get_Interface,
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},
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sizeof( T1_FaceRec ),
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sizeof( T1_SizeRec ),
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sizeof( T1_GlyphSlotRec ),
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(FT_Face_InitFunc) T1_Face_Init,
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(FT_Face_DoneFunc) T1_Face_Done,
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(FT_Size_InitFunc) T1_Size_Init,
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(FT_Size_DoneFunc) T1_Size_Done,
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(FT_Slot_InitFunc) T1_GlyphSlot_Init,
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(FT_Slot_DoneFunc) T1_GlyphSlot_Done,
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(FT_Size_ResetPointsFunc) T1_Size_Reset,
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(FT_Size_ResetPixelsFunc) T1_Size_Reset,
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(FT_Slot_LoadFunc) T1_Load_Glyph,
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#ifdef T1_CONFIG_OPTION_NO_AFM
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(FT_Face_GetKerningFunc) 0,
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(FT_Face_AttachFunc) 0,
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#else
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(FT_Face_GetKerningFunc) Get_Kerning,
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(FT_Face_AttachFunc) T1_Read_AFM,
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#endif
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(FT_Face_GetAdvancesFunc) 0
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};
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/* END */
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