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| 1 /* | |
| 2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg | |
| 3 * Copyright (C) 2006 Behdad Esfahbod | |
| 4 * | |
| 5 * This is part of HarfBuzz, an OpenType Layout engine library. | |
| 6 * | |
| 7 * Permission is hereby granted, without written agreement and without | |
| 8 * license or royalty fees, to use, copy, modify, and distribute this | |
| 9 * software and its documentation for any purpose, provided that the | |
| 10 * above copyright notice and the following two paragraphs appear in | |
| 11 * all copies of this software. | |
| 12 * | |
| 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
| 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
| 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 17 * DAMAGE. | |
| 18 * | |
| 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
| 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
| 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
| 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
| 24 */ | |
| 25 | |
| 26 #ifndef HARFBUZZ_GSUB_H | |
| 27 #define HARFBUZZ_GSUB_H | |
| 28 | |
| 29 #include "harfbuzz-gdef.h" | |
| 30 #include "harfbuzz-buffer.h" | |
| 31 | |
| 32 HB_BEGIN_HEADER | |
| 33 | |
| 34 | |
| 35 #ifdef HB_USE_PACKED_STRUCTS | |
| 36 #pragma pack(push, 1) | |
| 37 #endif | |
| 38 | |
| 39 /* Lookup types for glyph substitution */ | |
| 40 | |
| 41 #define HB_GSUB_LOOKUP_SINGLE 1 | |
| 42 #define HB_GSUB_LOOKUP_MULTIPLE 2 | |
| 43 #define HB_GSUB_LOOKUP_ALTERNATE 3 | |
| 44 #define HB_GSUB_LOOKUP_LIGATURE 4 | |
| 45 #define HB_GSUB_LOOKUP_CONTEXT 5 | |
| 46 #define HB_GSUB_LOOKUP_CHAIN 6 | |
| 47 #define HB_GSUB_LOOKUP_EXTENSION 7 | |
| 48 #define HB_GSUB_LOOKUP_REVERSE_CHAIN 8 | |
| 49 | |
| 50 | |
| 51 /* A pointer to a function which selects the alternate glyph. `pos' is | |
| 52 the position of the glyph with index `glyphID', `num_alternates' | |
| 53 gives the number of alternates in the `alternates' array. `data' | |
| 54 points to the user-defined structure specified during a call to | |
| 55 HB_GSUB_Register_Alternate_Function(). The function must return an | |
| 56 index into the `alternates' array. */ | |
| 57 | |
| 58 typedef HB_UShort (*HB_AltFunction)(HB_UInt pos, | |
| 59 HB_UShort glyphID, | |
| 60 HB_UShort num_alternates, | |
| 61 HB_UShort* alternates, | |
| 62 void* data ); | |
| 63 | |
| 64 | |
| 65 struct HB_GSUBHeader_ | |
| 66 { | |
| 67 HB_GDEFHeader* gdef; | |
| 68 | |
| 69 /* the next two fields are used for an alternate substitution callback | |
| 70 function to select the proper alternate glyph. */ | |
| 71 | |
| 72 void* data; | |
| 73 HB_AltFunction altfunc; | |
| 74 | |
| 75 HB_UInt offset; | |
| 76 | |
| 77 HB_16Dot16 Version; | |
| 78 | |
| 79 HB_ScriptList ScriptList; | |
| 80 HB_FeatureList FeatureList; | |
| 81 HB_LookupList LookupList; | |
| 82 }; | |
| 83 | |
| 84 typedef struct HB_GSUBHeader_ HB_GSUBHeader; | |
| 85 typedef HB_GSUBHeader* HB_GSUB; | |
| 86 | |
| 87 | |
| 88 HB_Error HB_Load_GSUB_Table( HB_Stream stream, | |
| 89 HB_GSUBHeader** gsub, | |
| 90 HB_GDEFHeader* gdef, | |
| 91 HB_Stream gdefStream ); | |
| 92 | |
| 93 | |
| 94 HB_Error HB_Done_GSUB_Table( HB_GSUBHeader* gsub ); | |
| 95 | |
| 96 | |
| 97 HB_Error HB_GSUB_Select_Script( HB_GSUBHeader* gsub, | |
| 98 HB_UInt script_tag, | |
| 99 HB_UShort* script_index ); | |
| 100 | |
| 101 HB_Error HB_GSUB_Select_Language( HB_GSUBHeader* gsub, | |
| 102 HB_UInt language_tag, | |
| 103 HB_UShort script_index, | |
| 104 HB_UShort* language_index, | |
| 105 HB_UShort* req_feature_index ); | |
| 106 | |
| 107 HB_Error HB_GSUB_Select_Feature( HB_GSUBHeader* gsub, | |
| 108 HB_UInt feature_tag, | |
| 109 HB_UShort script_index, | |
| 110 HB_UShort language_index, | |
| 111 HB_UShort* feature_index ); | |
| 112 | |
| 113 | |
| 114 HB_Error HB_GSUB_Query_Scripts( HB_GSUBHeader* gsub, | |
| 115 HB_UInt** script_tag_list ); | |
| 116 | |
| 117 HB_Error HB_GSUB_Query_Languages( HB_GSUBHeader* gsub, | |
| 118 HB_UShort script_index, | |
| 119 HB_UInt** language_tag_list ); | |
| 120 | |
| 121 HB_Error HB_GSUB_Query_Features( HB_GSUBHeader* gsub, | |
| 122 HB_UShort script_index, | |
| 123 HB_UShort language_index, | |
| 124 HB_UInt** feature_tag_list ); | |
| 125 | |
| 126 | |
| 127 HB_Error HB_GSUB_Add_Feature( HB_GSUBHeader* gsub, | |
| 128 HB_UShort feature_index, | |
| 129 HB_UInt property ); | |
| 130 | |
| 131 HB_Error HB_GSUB_Clear_Features( HB_GSUBHeader* gsub ); | |
| 132 | |
| 133 | |
| 134 HB_Error HB_GSUB_Register_Alternate_Function( HB_GSUBHeader* gsub, | |
| 135 HB_AltFunction altfunc, | |
| 136 void* data ); | |
| 137 | |
| 138 | |
| 139 HB_Error HB_GSUB_Apply_String( HB_GSUBHeader* gsub, | |
| 140 HB_Buffer buffer ); | |
| 141 | |
| 142 #ifdef HB_USE_PACKED_STRUCTS | |
| 143 #pragma pack(pop) | |
| 144 #endif | |
| 145 | |
| 146 HB_END_HEADER | |
| 147 | |
| 148 #endif /* HARFBUZZ_GSUB_H */ | |
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