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Diffstat (limited to 'third_party/harfbuzz/src/harfbuzz-gsub.h')
| -rw-r--r-- | third_party/harfbuzz/src/harfbuzz-gsub.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/third_party/harfbuzz/src/harfbuzz-gsub.h b/third_party/harfbuzz/src/harfbuzz-gsub.h new file mode 100644 index 0000000..1ca3f0c --- /dev/null +++ b/third_party/harfbuzz/src/harfbuzz-gsub.h @@ -0,0 +1,141 @@ +/* + * 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 */ |