ref: a960be9e5e9846e1e4e8d2254e0b405fbf84346b
dir: /src/type42/t42drivr.c/
/****************************************************************************
*
* t42drivr.c
*
* High-level Type 42 driver interface (body).
*
* Copyright (C) 2002-2022 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.
*
*/
/**************************************************************************
*
* This driver implements Type42 fonts as described in the
* Technical Note #5012 from Adobe, with these limitations:
*
* 1) CID Fonts are not currently supported.
* 2) Incremental fonts making use of the GlyphDirectory keyword
* will be loaded, but the rendering will be using the TrueType
* tables.
* 3) As for Type1 fonts, CDevProc is not supported.
* 4) The Metrics dictionary is not supported.
* 5) AFM metrics are not supported.
*
* In other words, this driver supports Type42 fonts derived from
* TrueType fonts in a non-CID manner, as done by usual conversion
* programs.
*
*/
#include "t42drivr.h"
#include "t42objs.h"
#include "t42error.h"
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/services/svfntfmt.h>
#include <freetype/internal/services/svgldict.h>
#include <freetype/internal/services/svpostnm.h>
#include <freetype/internal/services/svpsinfo.h>
#undef FT_COMPONENT
#define FT_COMPONENT t42
/*
*
* GLYPH DICT SERVICE
*
*/
static FT_Error
t42_get_glyph_name( T42_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max )
{
FT_STRCPYN( buffer, face->type1.glyph_names[glyph_index], buffer_max );
return FT_Err_Ok;
}
static FT_UInt
t42_get_name_index( T42_Face face,
const FT_String* glyph_name )
{
FT_Int i;
for ( i = 0; i < face->type1.num_glyphs; i++ )
{
FT_String* gname = face->type1.glyph_names[i];
if ( glyph_name[0] == gname[0] && !ft_strcmp( glyph_name, gname ) )
return (FT_UInt)ft_strtol( (const char *)face->type1.charstrings[i],
NULL, 10 );
}
return 0;
}
static const FT_Service_GlyphDictRec t42_service_glyph_dict =
{
(FT_GlyphDict_GetNameFunc) t42_get_glyph_name, /* get_name */
(FT_GlyphDict_NameIndexFunc)t42_get_name_index /* name_index */
};
/*
*
* POSTSCRIPT NAME SERVICE
*
*/
static const char*
t42_get_ps_font_name( T42_Face face )
{
return (const char*)face->type1.font_name;
}
static const FT_Service_PsFontNameRec t42_service_ps_font_name =
{
(FT_PsName_GetFunc)t42_get_ps_font_name /* get_ps_font_name */
};
/*
*
* POSTSCRIPT INFO SERVICE
*
*/
static FT_Error
t42_ps_get_font_info( FT_Face face,
PS_FontInfoRec* afont_info )
{
*afont_info = ((T42_Face)face)->type1.font_info;
return FT_Err_Ok;
}
static FT_Error
t42_ps_get_font_extra( FT_Face face,
PS_FontExtraRec* afont_extra )
{
*afont_extra = ((T42_Face)face)->type1.font_extra;
return FT_Err_Ok;
}
static FT_Int
t42_ps_has_glyph_names( FT_Face face )
{
FT_UNUSED( face );
return 1;
}
static const FT_Service_PsInfoRec t42_service_ps_info =
{
(PS_GetFontInfoFunc) t42_ps_get_font_info, /* ps_get_font_info */
(PS_GetFontExtraFunc) t42_ps_get_font_extra, /* ps_get_font_extra */
(PS_HasGlyphNamesFunc) t42_ps_has_glyph_names, /* ps_has_glyph_names */
/* Type42 fonts don't have a Private dict */
(PS_GetFontPrivateFunc)NULL, /* ps_get_font_private */
/* not implemented */
(PS_GetFontValueFunc) NULL /* ps_get_font_value */
};
/*
*
* SERVICE LIST
*
*/
static const FT_ServiceDescRec t42_services[] =
{
{ FT_SERVICE_ID_GLYPH_DICT, &t42_service_glyph_dict },
{ FT_SERVICE_ID_POSTSCRIPT_FONT_NAME, &t42_service_ps_font_name },
{ FT_SERVICE_ID_POSTSCRIPT_INFO, &t42_service_ps_info },
{ FT_SERVICE_ID_FONT_FORMAT, FT_FONT_FORMAT_TYPE_42 },
{ NULL, NULL }
};
FT_CALLBACK_DEF( FT_Module_Interface )
T42_Get_Interface( FT_Module module,
const FT_String* t42_interface )
{
FT_UNUSED( module );
return ft_service_list_lookup( t42_services, t42_interface );
}
const FT_Driver_ClassRec t42_driver_class =
{
{
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_SCALABLE |
#ifdef TT_USE_BYTECODE_INTERPRETER
FT_MODULE_DRIVER_HAS_HINTER,
#else
0,
#endif
sizeof ( T42_DriverRec ),
"type42",
0x10000L,
0x20000L,
NULL, /* module-specific interface */
T42_Driver_Init, /* FT_Module_Constructor module_init */
T42_Driver_Done, /* FT_Module_Destructor module_done */
T42_Get_Interface, /* FT_Module_Requester get_interface */
},
sizeof ( T42_FaceRec ),
sizeof ( T42_SizeRec ),
sizeof ( T42_GlyphSlotRec ),
T42_Face_Init, /* FT_Face_InitFunc init_face */
T42_Face_Done, /* FT_Face_DoneFunc done_face */
T42_Size_Init, /* FT_Size_InitFunc init_size */
T42_Size_Done, /* FT_Size_DoneFunc done_size */
T42_GlyphSlot_Init, /* FT_Slot_InitFunc init_slot */
T42_GlyphSlot_Done, /* FT_Slot_DoneFunc done_slot */
T42_GlyphSlot_Load, /* FT_Slot_LoadFunc load_glyph */
NULL, /* FT_Face_GetKerningFunc get_kerning */
NULL, /* FT_Face_AttachFunc attach_file */
NULL, /* FT_Face_GetAdvancesFunc get_advances */
T42_Size_Request, /* FT_Size_RequestFunc request_size */
T42_Size_Select /* FT_Size_SelectFunc select_size */
};
/* END */