| /******************************************************************* |
| * |
| * 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 */ |