ref: c093db9d06581455607d5997998eb664b9c55bcb
dir: /src/truetype/ttdriver.c/
/***************************************************************************/
/* */
/* ttdriver.c */
/* */
/* TrueType font driver implementation (body). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 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_SFNT_H
#include FT_TRUETYPE_IDS_H
#include FT_SERVICE_XFREE86_NAME_H
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include FT_MULTIPLE_MASTERS_H
#include FT_SERVICE_MULTIPLE_MASTERS_H
#endif
#include "ttdriver.h"
#include "ttgload.h"
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include "ttgxvar.h"
#endif
#include "tterrors.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_ttdriver
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** F A C E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#undef PAIR_TAG
#define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \
(FT_ULong)right )
/*************************************************************************/
/* */
/* <Function> */
/* tt_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
tt_get_kerning( FT_Face ttface, /* TT_Face */
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_Vector* kerning )
{
TT_Face face = (TT_Face)ttface;
SFNT_Service sfnt = (SFNT_Service)face->sfnt;
kerning->x = 0;
kerning->y = 0;
if ( sfnt )
kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph );
return 0;
}
#undef PAIR_TAG
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** S I Z E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
static FT_Error
tt_size_select( FT_Size size,
FT_ULong strike_index )
{
TT_Face ttface = (TT_Face)size->face;
TT_Size ttsize = (TT_Size)size;
FT_Error error = TT_Err_Ok;
ttsize->strike_index = strike_index;
if ( FT_IS_SCALABLE( size->face ) )
{
/* use the scaled metrics, even when tt_size_reset fails */
FT_Select_Metrics( size->face, strike_index );
tt_size_reset( ttsize );
}
else
{
SFNT_Service sfnt = ttface->sfnt;
FT_Size_Metrics* metrics = &size->metrics;
error = sfnt->load_strike_metrics( ttface, strike_index, metrics );
if ( error )
ttsize->strike_index = 0xFFFFFFFFUL;
}
return error;
}
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
static FT_Error
tt_size_request( FT_Size size,
FT_Size_Request req )
{
TT_Size ttsize = (TT_Size)size;
FT_Error error = TT_Err_Ok;
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
if ( FT_HAS_FIXED_SIZES( size->face ) )
{
TT_Face ttface = (TT_Face)size->face;
SFNT_Service sfnt = ttface->sfnt;
FT_ULong index;
error = sfnt->set_sbit_strike( ttface, req, &index );
if ( error )
ttsize->strike_index = 0xFFFFFFFFUL;
else
return tt_size_select( size, index );
}
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
FT_Request_Metrics( size->face, req );
if ( FT_IS_SCALABLE( size->face ) )
error = tt_size_reset( ttsize );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* Load_Glyph */
/* */
/* <Description> */
/* A driver method used to load a glyph within a given glyph slot. */
/* */
/* <Input> */
/* slot :: A handle to the target slot object where the glyph */
/* will be loaded. */
/* */
/* size :: A handle to the source face size at which the glyph */
/* must be scaled, loaded, etc. */
/* */
/* glyph_index :: The index of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FTLOAD_??? constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static FT_Error
Load_Glyph( FT_GlyphSlot ttslot, /* TT_GlyphSlot */
FT_Size ttsize, /* TT_Size */
FT_UInt glyph_index,
FT_Int32 load_flags )
{
TT_GlyphSlot slot = (TT_GlyphSlot)ttslot;
TT_Size size = (TT_Size)ttsize;
FT_Error error;
if ( !slot )
return TT_Err_Invalid_Slot_Handle;
if ( !size )
return TT_Err_Invalid_Size_Handle;
if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) )
{
load_flags |= FT_LOAD_NO_HINTING |
FT_LOAD_NO_BITMAP |
FT_LOAD_NO_SCALE;
}
/* now load the glyph outline if necessary */
error = TT_Load_Glyph( size, slot, glyph_index, load_flags );
/* force drop-out mode to 2 - irrelevant now */
/* slot->outline.dropout_mode = 2; */
return error;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** D R I V E R I N T E R F A C E ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
static const FT_Service_MultiMastersRec tt_service_gx_multi_masters =
{
(FT_Get_MM_Func) NULL,
(FT_Set_MM_Design_Func) NULL,
(FT_Set_MM_Blend_Func) TT_Set_MM_Blend,
(FT_Get_MM_Var_Func) TT_Get_MM_Var,
(FT_Set_Var_Design_Func)TT_Set_Var_Design
};
#endif
static const FT_ServiceDescRec tt_services[] =
{
{ FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE },
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
{ FT_SERVICE_ID_MULTI_MASTERS, &tt_service_gx_multi_masters },
#endif
{ NULL, NULL }
};
FT_CALLBACK_DEF( FT_Module_Interface )
tt_get_interface( FT_Module driver, /* TT_Driver */
const char* tt_interface )
{
FT_Module_Interface result;
FT_Module sfntd;
SFNT_Service sfnt;
result = ft_service_list_lookup( tt_services, tt_interface );
if ( result != NULL )
return result;
/* only return the default interface from the SFNT module */
sfntd = FT_Get_Module( driver->library, "sfnt" );
if ( sfntd )
{
sfnt = (SFNT_Service)( sfntd->clazz->module_interface );
if ( sfnt )
return sfnt->get_interface( driver, tt_interface );
}
return 0;
}
/* The FT_DriverInterface structure is defined in ftdriver.h. */
FT_CALLBACK_TABLE_DEF
const FT_Driver_ClassRec tt_driver_class =
{
{
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_SCALABLE |
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
FT_MODULE_DRIVER_HAS_HINTER,
#else
0,
#endif
sizeof ( TT_DriverRec ),
"truetype", /* driver name */
0x10000L, /* driver version == 1.0 */
0x20000L, /* driver requires FreeType 2.0 or above */
(void*)0, /* driver specific interface */
tt_driver_init,
tt_driver_done,
tt_get_interface,
},
sizeof ( TT_FaceRec ),
sizeof ( TT_SizeRec ),
sizeof ( FT_GlyphSlotRec ),
tt_face_init,
tt_face_done,
tt_size_init,
tt_size_done,
tt_slot_init,
0, /* FT_Slot_DoneFunc */
#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
ft_stub_set_char_sizes,
ft_stub_set_pixel_sizes,
#endif
Load_Glyph,
tt_get_kerning,
0, /* FT_Face_AttachFunc */
0, /* FT_Face_GetAdvancesFunc */
tt_size_request,
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
tt_size_select
#else
0 /* FT_Size_SelectFunc */
#endif
};
/* END */