175 lines
5.5 KiB
C
175 lines
5.5 KiB
C
/*
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* Copyright (C) 1998-2004 David Turner and Werner Lemberg
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* Copyright (C) 2006 Behdad Esfahbod
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef HARFBUZZ_GPOS_H
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#define HARFBUZZ_GPOS_H
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#include "harfbuzz-gdef.h"
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#include "harfbuzz-buffer.h"
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HB_BEGIN_HEADER
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/* Lookup types for glyph positioning */
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#define HB_GPOS_LOOKUP_SINGLE 1
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#define HB_GPOS_LOOKUP_PAIR 2
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#define HB_GPOS_LOOKUP_CURSIVE 3
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#define HB_GPOS_LOOKUP_MARKBASE 4
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#define HB_GPOS_LOOKUP_MARKLIG 5
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#define HB_GPOS_LOOKUP_MARKMARK 6
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#define HB_GPOS_LOOKUP_CONTEXT 7
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#define HB_GPOS_LOOKUP_CHAIN 8
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#define HB_GPOS_LOOKUP_EXTENSION 9
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/* A pointer to a function which loads a glyph. Its parameters are
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the same as in a call to Load_Glyph() -- if no glyph loading
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function will be registered with HB_GPOS_Register_Glyph_Function(),
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Load_Glyph() will be called indeed. The purpose of this function
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pointer is to provide a hook for caching glyph outlines and sbits
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(using the instance's generic pointer to hold the data).
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If for some reason no outline data is available (e.g. for an
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embedded bitmap glyph), _glyph->outline.n_points should be set to
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zero. */
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typedef HB_Error (*HB_GlyphFunction)(HB_Font font,
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HB_UInt glyphIndex,
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HB_Int loadFlags );
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/* A pointer to a function which accesses the PostScript interpreter.
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Multiple Master fonts need this interface to convert a metric ID
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(as stored in an OpenType font version 1.2 or higher) `metric_id'
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into a metric value (returned in `metric_value').
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`data' points to the user-defined structure specified during a
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call to HB_GPOS_Register_MM_Function().
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`metric_value' must be returned as a scaled value (but shouldn't
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be rounded). */
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typedef HB_Error (*HB_MMFunction)(HB_Font font,
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HB_UShort metric_id,
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HB_Fixed* metric_value,
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void* data );
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struct HB_GPOSHeader_
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{
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HB_16Dot16 Version;
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HB_ScriptList ScriptList;
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HB_FeatureList FeatureList;
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HB_LookupList LookupList;
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HB_GDEFHeader* gdef;
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/* the next field is used for a callback function to get the
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glyph outline. */
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HB_GlyphFunction gfunc;
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/* this is OpenType 1.2 -- Multiple Master fonts need this
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callback function to get various metric values from the
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PostScript interpreter. */
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HB_MMFunction mmfunc;
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void* data;
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};
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typedef struct HB_GPOSHeader_ HB_GPOSHeader;
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typedef HB_GPOSHeader* HB_GPOS;
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HB_Error HB_Load_GPOS_Table( HB_Font font,
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HB_GPOSHeader** gpos,
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HB_GDEFHeader* gdef );
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HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos );
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HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
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HB_UInt script_tag,
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HB_UShort* script_index );
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HB_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos,
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HB_UInt language_tag,
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HB_UShort script_index,
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HB_UShort* language_index,
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HB_UShort* req_feature_index );
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HB_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos,
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HB_UInt feature_tag,
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HB_UShort script_index,
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HB_UShort language_index,
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HB_UShort* feature_index );
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HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
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HB_UInt** script_tag_list );
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HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
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HB_UShort script_index,
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HB_UInt** language_tag_list );
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HB_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos,
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HB_UShort script_index,
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HB_UShort language_index,
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HB_UInt** feature_tag_list );
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HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
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HB_UShort feature_index,
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HB_UInt property );
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HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos );
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HB_Error HB_GPOS_Register_Glyph_Function( HB_GPOSHeader* gpos,
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HB_GlyphFunction gfunc );
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HB_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos,
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HB_MMFunction mmfunc,
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void* data );
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/* If `dvi' is TRUE, glyph contour points for anchor points and device
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tables are ignored -- you will get device independent values. */
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HB_Error HB_GPOS_Apply_String( HB_Font font,
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HB_GPOSHeader* gpos,
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HB_UShort load_flags,
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HB_Buffer buffer,
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HB_Bool dvi,
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HB_Bool r2l );
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HB_END_HEADER
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#endif /* HARFBUZZ_GPOS_H */
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