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/*******************************************************************
*
* Copyright 1996-2000 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* Copyright 2006 Behdad Esfahbod
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* See the file name COPYING for licensing information.
*
******************************************************************/
#ifndef HARFBUZZ_GPOS_H
#define HARFBUZZ_GPOS_H
#include "harfbuzz-gdef.h"
#include "harfbuzz-buffer.h"
HB_BEGIN_HEADER
/* Lookup types for glyph positioning */
#define HB_GPOS_LOOKUP_SINGLE 1
#define HB_GPOS_LOOKUP_PAIR 2
#define HB_GPOS_LOOKUP_CURSIVE 3
#define HB_GPOS_LOOKUP_MARKBASE 4
#define HB_GPOS_LOOKUP_MARKLIG 5
#define HB_GPOS_LOOKUP_MARKMARK 6
#define HB_GPOS_LOOKUP_CONTEXT 7
#define HB_GPOS_LOOKUP_CHAIN 8
#define HB_GPOS_LOOKUP_EXTENSION 9
/* A pointer to a function which loads a glyph. Its parameters are
the same as in a call to Load_Glyph() -- if no glyph loading
function will be registered with HB_GPOS_Register_Glyph_Function(),
Load_Glyph() will be called indeed. The purpose of this function
pointer is to provide a hook for caching glyph outlines and sbits
(using the instance's generic pointer to hold the data).
If for some reason no outline data is available (e.g. for an
embedded bitmap glyph), _glyph->outline.n_points should be set to
zero. _glyph can be computed with
_glyph = HANDLE_Glyph( glyph ) */
typedef HB_Error (*HB_GlyphFunction)(FT_Face face,
HB_UInt glyphIndex,
HB_Int loadFlags );
/* A pointer to a function which accesses the PostScript interpreter.
Multiple Master fonts need this interface to convert a metric ID
(as stored in an OpenType font version 1.2 or higher) `metric_id'
into a metric value (returned in `metric_value').
`data' points to the user-defined structure specified during a
call to HB_GPOS_Register_MM_Function().
`metric_value' must be returned as a scaled value (but shouldn't
be rounded). */
typedef HB_Error (*HB_MMFunction)(FT_Face face,
HB_UShort metric_id,
FT_Pos* metric_value,
void* data );
struct HB_GPOSHeader_
{
FT_Fixed Version;
HB_ScriptList ScriptList;
HB_FeatureList FeatureList;
HB_LookupList LookupList;
HB_GDEFHeader* gdef;
/* the next field is used for a callback function to get the
glyph outline. */
HB_GlyphFunction gfunc;
/* this is OpenType 1.2 -- Multiple Master fonts need this
callback function to get various metric values from the
PostScript interpreter. */
HB_MMFunction mmfunc;
void* data;
};
typedef struct HB_GPOSHeader_ HB_GPOSHeader;
typedef HB_GPOSHeader* HB_GPOS;
HB_Error HB_Load_GPOS_Table( FT_Face face,
HB_GPOSHeader** gpos,
HB_GDEFHeader* gdef );
HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos );
HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
HB_UInt script_tag,
HB_UShort* script_index );
HB_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos,
HB_UInt language_tag,
HB_UShort script_index,
HB_UShort* language_index,
HB_UShort* req_feature_index );
HB_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos,
HB_UInt feature_tag,
HB_UShort script_index,
HB_UShort language_index,
HB_UShort* feature_index );
HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
HB_UInt** script_tag_list );
HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
HB_UShort script_index,
HB_UInt** language_tag_list );
HB_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos,
HB_UShort script_index,
HB_UShort language_index,
HB_UInt** feature_tag_list );
HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
HB_UShort feature_index,
HB_UInt property );
HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos );
HB_Error HB_GPOS_Register_Glyph_Function( HB_GPOSHeader* gpos,
HB_GlyphFunction gfunc );
HB_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos,
HB_MMFunction mmfunc,
void* data );
/* If `dvi' is TRUE, glyph contour points for anchor points and device
tables are ignored -- you will get device independent values. */
HB_Error HB_GPOS_Apply_String( FT_Face face,
HB_GPOSHeader* gpos,
HB_UShort load_flags,
HB_Buffer buffer,
HB_Bool dvi,
HB_Bool r2l );
HB_END_HEADER
#endif /* HARFBUZZ_GPOS_H */
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