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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_GDEF_H
#define HARFBUZZ_GDEF_H
#include "harfbuzz-open.h"
FT_BEGIN_HEADER
#define HB_Err_Invalid_GDEF_SubTable_Format 0x1030
#define HB_Err_Invalid_GDEF_SubTable 0x1031
/* GDEF glyph properties. Note that HB_GDEF_COMPONENT has no corresponding
* flag in the LookupFlag field. */
#define HB_GDEF_BASE_GLYPH 0x0002
#define HB_GDEF_LIGATURE 0x0004
#define HB_GDEF_MARK 0x0008
#define HB_GDEF_COMPONENT 0x0010
typedef struct HB_AttachPoint_ HB_AttachPoint;
struct HB_AttachList_
{
FT_Bool loaded;
HB_Coverage Coverage; /* Coverage table */
FT_UShort GlyphCount; /* number of glyphs with
attachments */
HB_AttachPoint* AttachPoint; /* array of AttachPoint tables */
};
typedef struct HB_AttachList_ HB_AttachList;
typedef struct HB_LigGlyph_ HB_LigGlyph;
struct HB_LigCaretList_
{
FT_Bool loaded;
HB_Coverage Coverage; /* Coverage table */
FT_UShort LigGlyphCount; /* number of ligature glyphs */
HB_LigGlyph* LigGlyph; /* array of LigGlyph tables */
};
typedef struct HB_LigCaretList_ HB_LigCaretList;
/* The `NewGlyphClasses' field is not defined in the TTO specification.
We use it for fonts with a constructed `GlyphClassDef' structure
(i.e., which don't have a GDEF table) to collect glyph classes
assigned during the lookup process. The number of arrays in this
pointer array is GlyphClassDef->cd.cd2.ClassRangeCount+1; the nth
array then contains the glyph class values of the glyphs not covered
by the ClassRangeRecords structures with index n-1 and n. We store
glyph class values for four glyphs in a single array element.
`LastGlyph' is identical to the number of glyphs minus one in the
font; we need it only if `NewGlyphClasses' is not NULL (to have an
upper bound for the last array).
Note that we first store the file offset to the `MarkAttachClassDef'
field (which has been introduced in OpenType 1.2) -- since the
`Version' field value hasn't been increased to indicate that we have
one more field for some obscure reason, we must parse the GSUB table
to find out whether class values refer to this table. Only then we
can finally load the MarkAttachClassDef structure if necessary. */
struct HB_GDEFHeader_
{
FT_Memory memory;
FT_ULong offset;
FT_Fixed Version;
HB_ClassDefinition GlyphClassDef;
HB_AttachList AttachList;
HB_LigCaretList LigCaretList;
FT_ULong MarkAttachClassDef_offset;
HB_ClassDefinition MarkAttachClassDef; /* new in OT 1.2 */
FT_UShort LastGlyph;
FT_UShort** NewGlyphClasses;
};
typedef struct HB_GDEFHeader_ HB_GDEFHeader;
typedef struct HB_GDEFHeader_* HB_GDEF;
FT_Error HB_New_GDEF_Table( FT_Face face,
HB_GDEFHeader** retptr );
FT_Error HB_Load_GDEF_Table( FT_Face face,
HB_GDEFHeader** gdef );
FT_Error HB_Done_GDEF_Table ( HB_GDEFHeader* gdef );
FT_Error HB_GDEF_Get_Glyph_Property( HB_GDEFHeader* gdef,
FT_UShort glyphID,
FT_UShort* property );
FT_Error HB_GDEF_Build_ClassDefinition( HB_GDEFHeader* gdef,
FT_UShort num_glyphs,
FT_UShort glyph_count,
FT_UShort* glyph_array,
FT_UShort* class_array );
FT_END_HEADER
#endif /* HARFBUZZ_GDEF_H */
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