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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_GPOS_H | |
| 27 #define HARFBUZZ_GPOS_H | |
| 28 | |
| 29 #include "harfbuzz-gdef.h" | |
| 30 #include "harfbuzz-buffer.h" | |
| 31 | |
| 32 HB_BEGIN_HEADER | |
| 33 | |
| 34 | |
| 35 /* Lookup types for glyph positioning */ | |
| 36 | |
| 37 #define HB_GPOS_LOOKUP_SINGLE 1 | |
| 38 #define HB_GPOS_LOOKUP_PAIR 2 | |
| 39 #define HB_GPOS_LOOKUP_CURSIVE 3 | |
| 40 #define HB_GPOS_LOOKUP_MARKBASE 4 | |
| 41 #define HB_GPOS_LOOKUP_MARKLIG 5 | |
| 42 #define HB_GPOS_LOOKUP_MARKMARK 6 | |
| 43 #define HB_GPOS_LOOKUP_CONTEXT 7 | |
| 44 #define HB_GPOS_LOOKUP_CHAIN 8 | |
| 45 #define HB_GPOS_LOOKUP_EXTENSION 9 | |
| 46 | |
| 47 #ifdef HB_SUPPORT_MULTIPLE_MASTER | |
| 48 /* A pointer to a function which accesses the PostScript interpreter. | |
| 49 Multiple Master fonts need this interface to convert a metric ID | |
| 50 (as stored in an OpenType font version 1.2 or higher) `metric_id' | |
| 51 into a metric value (returned in `metric_value'). | |
| 52 | |
| 53 `data' points to the user-defined structure specified during a | |
| 54 call to HB_GPOS_Register_MM_Function(). | |
| 55 | |
| 56 `metric_value' must be returned as a scaled value (but shouldn't | |
| 57 be rounded). */ | |
| 58 | |
| 59 typedef HB_Error (*HB_MMFunction)(HB_Font font, | |
| 60 HB_UShort metric_id, | |
| 61 HB_Fixed* metric_value, | |
| 62 void* data ); | |
| 63 #endif | |
| 64 | |
| 65 | |
| 66 struct HB_GPOSHeader_ | |
| 67 { | |
| 68 HB_16Dot16 Version; | |
| 69 | |
| 70 HB_ScriptList ScriptList; | |
| 71 HB_FeatureList FeatureList; | |
| 72 HB_LookupList LookupList; | |
| 73 | |
| 74 HB_GDEFHeader* gdef; | |
| 75 | |
| 76 #ifdef HB_SUPPORT_MULTIPLE_MASTER | |
| 77 /* this is OpenType 1.2 -- Multiple Master fonts need this | |
| 78 callback function to get various metric values from the | |
| 79 PostScript interpreter. */ | |
| 80 | |
| 81 HB_MMFunction mmfunc; | |
| 82 void* data; | |
| 83 #endif | |
| 84 }; | |
| 85 | |
| 86 typedef struct HB_GPOSHeader_ HB_GPOSHeader; | |
| 87 typedef HB_GPOSHeader* HB_GPOS; | |
| 88 | |
| 89 | |
| 90 HB_Error HB_Load_GPOS_Table( HB_Stream stream, | |
| 91 HB_GPOSHeader** gpos, | |
| 92 HB_GDEFHeader* gdef, | |
| 93 HB_Stream gdefStream ); | |
| 94 | |
| 95 | |
| 96 HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos ); | |
| 97 | |
| 98 | |
| 99 HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos, | |
| 100 HB_UInt script_tag, | |
| 101 HB_UShort* script_index ); | |
| 102 | |
| 103 HB_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos, | |
| 104 HB_UInt language_tag, | |
| 105 HB_UShort script_index, | |
| 106 HB_UShort* language_index, | |
| 107 HB_UShort* req_feature_index ); | |
| 108 | |
| 109 HB_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos, | |
| 110 HB_UInt feature_tag, | |
| 111 HB_UShort script_index, | |
| 112 HB_UShort language_index, | |
| 113 HB_UShort* feature_index ); | |
| 114 | |
| 115 | |
| 116 HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos, | |
| 117 HB_UInt** script_tag_list ); | |
| 118 | |
| 119 HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos, | |
| 120 HB_UShort script_index, | |
| 121 HB_UInt** language_tag_list ); | |
| 122 | |
| 123 HB_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos, | |
| 124 HB_UShort script_index, | |
| 125 HB_UShort language_index, | |
| 126 HB_UInt** feature_tag_list ); | |
| 127 | |
| 128 | |
| 129 HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos, | |
| 130 HB_UShort feature_index, | |
| 131 HB_UInt property ); | |
| 132 | |
| 133 HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos ); | |
| 134 | |
| 135 | |
| 136 #ifdef HB_SUPPORT_MULTIPLE_MASTER | |
| 137 HB_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos, | |
| 138 HB_MMFunction mmfunc, | |
| 139 void* data ); | |
| 140 #endif | |
| 141 | |
| 142 /* If `dvi' is TRUE, glyph contour points for anchor points and device | |
| 143 tables are ignored -- you will get device independent values. */ | |
| 144 | |
| 145 | |
| 146 HB_Error HB_GPOS_Apply_String( HB_Font font, | |
| 147 HB_GPOSHeader* gpos, | |
| 148 HB_UShort load_flags, | |
| 149 HB_Buffer buffer, | |
| 150 HB_Bool dvi, | |
| 151 HB_Bool r2l ); | |
| 152 | |
| 153 HB_END_HEADER | |
| 154 | |
| 155 #endif /* HARFBUZZ_GPOS_H */ | |
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