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/***************************************************************************/
/* */
/* gfdrivr.h */
/* */
/* FreeType font driver for TeX's GF FONT files */
/* */
/* Copyright 1996-2018 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 FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_OBJECTS_H
#include "gf.h"
#include "gfdrivr.h"
#include "gferror.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_gfdriver
typedef struct GF_CMapRec_
{
FT_CMapRec cmap;
FT_UInt32 bc; /* Beginning Character */
FT_UInt32 ec; /* End Character */
} GF_CMapRec, *GF_CMap;
FT_CALLBACK_DEF( FT_Error )
gf_cmap_init( FT_CMap gfcmap,
FT_Pointer init_data )
{
GF_CMap cmap = (GF_CMap)gfcmap;
FT_UNUSED( init_data );
cmap->bc = 0;
cmap->ec = 255;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( void )
gf_cmap_done( FT_CMap gfcmap )
{
GF_CMap cmap = (GF_CMap)gfcmap;
cmap->bc = 0;
cmap->ec = -1;
}
FT_CALLBACK_DEF( FT_UInt )
gf_cmap_char_index( FT_CMap gfcmap,
FT_UInt32 char_code )
{
FT_UInt gindex = 0;
GF_CMap cmap = (GF_CMap)gfcmap;
char_code -= cmap->bc;
if ( char_code < cmap->ec - cmap->bc + 1 )
gindex = (FT_UInt)( char_code );
return gindex;
}
FT_CALLBACK_DEF( FT_UInt )
gf_cmap_char_next( FT_CMap gfcmap,
FT_UInt32 *achar_code )
{
FT_UInt gindex = 0;
FT_UInt32 result = 0;
FT_UInt32 char_code = *achar_code + 1;
if ( char_code <= cmap->bc )
{
result = cmap->bc;
gindex = 1;
}
else
{
char_code -= cmap->bc;
if ( char_code < cmap->ec - cmap->bc + 1 )
{
result = char_code;
gindex = (FT_UInt)( char_code );
}
}
*achar_code = result;
return gindex;
}
static
const FT_CMap_ClassRec gf_cmap_class =
{
sizeof ( GF_CMapRec ),
gf_cmap_init,
gf_cmap_done,
gf_cmap_char_index,
gf_cmap_char_next,
NULL, NULL, NULL, NULL, NULL
};
FT_CALLBACK_DEF( void )
GF_Face_Done( FT_Face gfface ) /* GF_Face */
{
//TO-DO
}
FT_CALLBACK_DEF( FT_Error )
GF_Face_Init( FT_Stream stream,
FT_Face gfface, /* GF_Face */
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
//TO-DO
}
FT_CALLBACK_DEF( FT_Error )
GF_Size_Select( FT_Size size,
FT_ULong strike_index )
{
GF_Face face = (GF_Face)size->face;
FT_UNUSED( strike_index );
FT_Select_Metrics( size->face, 0 );
size->metrics.ascender = /* */ ;
size->metrics.descender = /* */ ;
size->metrics.max_advance = /* */ ;
return FT_Err_Ok;
}
FT_CALLBACK_DEF( FT_Error )
GF_Size_Request( FT_Size size,
FT_Size_Request req )
{
GF_Face face = (GF_Face)size->face;
FT_Bitmap_Size* bsize = size->face->available_sizes;
FT_Error error = FT_ERR( Invalid_Pixel_Size );
FT_Long height;
height = FT_REQUEST_HEIGHT( req );
height = ( height + 32 ) >> 6;
switch ( req->type )
{
case FT_SIZE_REQUEST_TYPE_NOMINAL:
if ( height == ( ( bsize->y_ppem + 32 ) >> 6 ) )
error = FT_Err_Ok;
break;
case FT_SIZE_REQUEST_TYPE_REAL_DIM:
if ( height == /* */ )
error = FT_Err_Ok;
break;
default:
error = FT_THROW( Unimplemented_Feature );
break;
}
if ( error )
return error;
else
return GF_Size_Select( size, 0 );
}
FT_CALLBACK_DEF( FT_Error )
GF_Glyph_Load( FT_GlyphSlot slot,
FT_Size size,
FT_UInt glyph_index,
FT_Int32 load_flags )
{
//TO-DO
}
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec gf_driver_class =
{
{
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_NO_OUTLINES,
sizeof ( FT_DriverRec ),
"gf",
0x10000L,
0x20000L,
NULL, /* module-specific interface */
NULL, /* FT_Module_Constructor module_init */
NULL, /* FT_Module_Destructor module_done */
NULL /* FT_Module_Requester get_interface */
},
sizeof ( GF_FaceRec ),
sizeof ( FT_SizeRec ),
sizeof ( FT_GlyphSlotRec ),
GF_Face_Init, /* FT_Face_InitFunc init_face */
GF_Face_Done, /* FT_Face_DoneFunc done_face */
NULL, /* FT_Size_InitFunc init_size */
NULL, /* FT_Size_DoneFunc done_size */
NULL, /* FT_Slot_InitFunc init_slot */
NULL, /* FT_Slot_DoneFunc done_slot */
GF_Glyph_Load, /* FT_Slot_LoadFunc load_glyph */
NULL, /* FT_Face_GetKerningFunc get_kerning */
NULL, /* FT_Face_AttachFunc attach_file */
NULL, /* FT_Face_GetAdvancesFunc get_advances */
GF_Size_Request, /* FT_Size_RequestFunc request_size */
GF_Size_Select /* FT_Size_SelectFunc select_size */
};
/* END */
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