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Diffstat (limited to 'trunk/pango/opentype/harfbuzz-gpos.h')
| -rw-r--r-- | trunk/pango/opentype/harfbuzz-gpos.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/trunk/pango/opentype/harfbuzz-gpos.h b/trunk/pango/opentype/harfbuzz-gpos.h new file mode 100644 index 00000000..1c670279 --- /dev/null +++ b/trunk/pango/opentype/harfbuzz-gpos.h @@ -0,0 +1,168 @@ +/******************************************************************* + * + * 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" + +FT_BEGIN_HEADER + +#define HB_Err_Invalid_GPOS_SubTable_Format 0x1020 +#define HB_Err_Invalid_GPOS_SubTable 0x1021 + + +/* 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 FT_Error (*HB_GlyphFunction)(FT_Face face, + FT_UInt glyphIndex, + FT_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 FT_Error (*HB_MMFunction)(FT_Face face, + FT_UShort metric_id, + FT_Pos* metric_value, + void* data ); + + +struct HB_GPOSHeader_ +{ + FT_Memory memory; + + 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; + + +FT_Error HB_Load_GPOS_Table( FT_Face face, + HB_GPOSHeader** gpos, + HB_GDEFHeader* gdef ); + + +FT_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos ); + + +FT_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos, + FT_ULong script_tag, + FT_UShort* script_index ); + +FT_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos, + FT_ULong language_tag, + FT_UShort script_index, + FT_UShort* language_index, + FT_UShort* req_feature_index ); + +FT_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos, + FT_ULong feature_tag, + FT_UShort script_index, + FT_UShort language_index, + FT_UShort* feature_index ); + + +FT_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos, + FT_ULong** script_tag_list ); + +FT_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos, + FT_UShort script_index, + FT_ULong** language_tag_list ); + +FT_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos, + FT_UShort script_index, + FT_UShort language_index, + FT_ULong** feature_tag_list ); + + +FT_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos, + FT_UShort feature_index, + FT_UInt property ); + +FT_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos ); + + +FT_Error HB_GPOS_Register_Glyph_Function( HB_GPOSHeader* gpos, + HB_GlyphFunction gfunc ); + + +FT_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. */ + + +FT_Error HB_GPOS_Apply_String( FT_Face face, + HB_GPOSHeader* gpos, + FT_UShort load_flags, + HB_Buffer buffer, + FT_Bool dvi, + FT_Bool r2l ); + +FT_END_HEADER + +#endif /* HARFBUZZ_GPOS_H */ |