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/*
* Copyright (C) 1998-2004 David Turner and Werner Lemberg
* Copyright (C) 2006 Behdad Esfahbod
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#ifndef HARFBUZZ_GSUB_H
#define HARFBUZZ_GSUB_H
#include "harfbuzz-gdef.h"
#include "harfbuzz-buffer.h"
HB_BEGIN_HEADER
/* Lookup types for glyph substitution */
#define HB_GSUB_LOOKUP_SINGLE 1
#define HB_GSUB_LOOKUP_MULTIPLE 2
#define HB_GSUB_LOOKUP_ALTERNATE 3
#define HB_GSUB_LOOKUP_LIGATURE 4
#define HB_GSUB_LOOKUP_CONTEXT 5
#define HB_GSUB_LOOKUP_CHAIN 6
#define HB_GSUB_LOOKUP_EXTENSION 7
#define HB_GSUB_LOOKUP_REVERSE_CHAIN 8
/* A pointer to a function which selects the alternate glyph. `pos' is
the position of the glyph with index `glyphID', `num_alternates'
gives the number of alternates in the `alternates' array. `data'
points to the user-defined structure specified during a call to
HB_GSUB_Register_Alternate_Function(). The function must return an
index into the `alternates' array. */
typedef HB_UShort (*HB_AltFunction)(HB_UInt pos,
HB_UShort glyphID,
HB_UShort num_alternates,
HB_UShort* alternates,
void* data );
struct HB_GSUBHeader_
{
HB_UInt offset;
HB_16Dot16 Version;
HB_ScriptList ScriptList;
HB_FeatureList FeatureList;
HB_LookupList LookupList;
HB_GDEFHeader* gdef;
/* the next two fields are used for an alternate substitution callback
function to select the proper alternate glyph. */
HB_AltFunction altfunc;
void* data;
};
typedef struct HB_GSUBHeader_ HB_GSUBHeader;
typedef HB_GSUBHeader* HB_GSUB;
HB_Error HB_Load_GSUB_Table( HB_Stream stream,
HB_GSUBHeader** gsub,
HB_GDEFHeader* gdef,
HB_Stream gdefStream );
HB_Error HB_Done_GSUB_Table( HB_GSUBHeader* gsub );
HB_Error HB_GSUB_Select_Script( HB_GSUBHeader* gsub,
HB_UInt script_tag,
HB_UShort* script_index );
HB_Error HB_GSUB_Select_Language( HB_GSUBHeader* gsub,
HB_UInt language_tag,
HB_UShort script_index,
HB_UShort* language_index,
HB_UShort* req_feature_index );
HB_Error HB_GSUB_Select_Feature( HB_GSUBHeader* gsub,
HB_UInt feature_tag,
HB_UShort script_index,
HB_UShort language_index,
HB_UShort* feature_index );
HB_Error HB_GSUB_Query_Scripts( HB_GSUBHeader* gsub,
HB_UInt** script_tag_list );
HB_Error HB_GSUB_Query_Languages( HB_GSUBHeader* gsub,
HB_UShort script_index,
HB_UInt** language_tag_list );
HB_Error HB_GSUB_Query_Features( HB_GSUBHeader* gsub,
HB_UShort script_index,
HB_UShort language_index,
HB_UInt** feature_tag_list );
HB_Error HB_GSUB_Add_Feature( HB_GSUBHeader* gsub,
HB_UShort feature_index,
HB_UInt property );
HB_Error HB_GSUB_Clear_Features( HB_GSUBHeader* gsub );
HB_Error HB_GSUB_Register_Alternate_Function( HB_GSUBHeader* gsub,
HB_AltFunction altfunc,
void* data );
HB_Error HB_GSUB_Apply_String( HB_GSUBHeader* gsub,
HB_Buffer buffer );
HB_END_HEADER
#endif /* HARFBUZZ_GSUB_H */
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