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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_GDEF_H | |
| 27 #define HARFBUZZ_GDEF_H | |
| 28 | |
| 29 #include "harfbuzz-open.h" | |
| 30 #include "harfbuzz-stream.h" | |
| 31 | |
| 32 HB_BEGIN_HEADER | |
| 33 | |
| 34 #ifdef HB_USE_PACKED_STRUCTS | |
| 35 #pragma pack(push, 1) | |
| 36 #endif | |
| 37 | |
| 38 /* GDEF glyph properties. Note that HB_GDEF_COMPONENT has no corresponding | |
| 39 * flag in the LookupFlag field. */ | |
| 40 #define HB_GDEF_BASE_GLYPH 0x0002 | |
| 41 #define HB_GDEF_LIGATURE 0x0004 | |
| 42 #define HB_GDEF_MARK 0x0008 | |
| 43 #define HB_GDEF_COMPONENT 0x0010 | |
| 44 | |
| 45 | |
| 46 typedef struct HB_AttachPoint_ HB_AttachPoint; | |
| 47 | |
| 48 | |
| 49 struct HB_AttachList_ | |
| 50 { | |
| 51 HB_AttachPoint* AttachPoint; /* array of AttachPoint tables */ | |
| 52 HB_Coverage Coverage; /* Coverage table */ | |
| 53 HB_UShort GlyphCount; /* number of glyphs with | |
| 54 attachments */ | |
| 55 HB_Bool loaded; | |
| 56 }; | |
| 57 | |
| 58 typedef struct HB_AttachList_ HB_AttachList; | |
| 59 | |
| 60 typedef struct HB_LigGlyph_ HB_LigGlyph; | |
| 61 | |
| 62 struct HB_LigCaretList_ | |
| 63 { | |
| 64 HB_LigGlyph* LigGlyph; /* array of LigGlyph tables */ | |
| 65 HB_Coverage Coverage; /* Coverage table */ | |
| 66 HB_UShort LigGlyphCount; /* number of ligature glyphs */ | |
| 67 HB_Bool loaded; | |
| 68 }; | |
| 69 | |
| 70 typedef struct HB_LigCaretList_ HB_LigCaretList; | |
| 71 | |
| 72 | |
| 73 | |
| 74 /* The `NewGlyphClasses' field is not defined in the TTO specification. | |
| 75 We use it for fonts with a constructed `GlyphClassDef' structure | |
| 76 (i.e., which don't have a GDEF table) to collect glyph classes | |
| 77 assigned during the lookup process. The number of arrays in this | |
| 78 pointer array is GlyphClassDef->cd.cd2.ClassRangeCount+1; the nth | |
| 79 array then contains the glyph class values of the glyphs not covered | |
| 80 by the ClassRangeRecords structures with index n-1 and n. We store | |
| 81 glyph class values for four glyphs in a single array element. | |
| 82 | |
| 83 `LastGlyph' is identical to the number of glyphs minus one in the | |
| 84 font; we need it only if `NewGlyphClasses' is not NULL (to have an | |
| 85 upper bound for the last array). | |
| 86 | |
| 87 Note that we first store the file offset to the `MarkAttachClassDef' | |
| 88 field (which has been introduced in OpenType 1.2) -- since the | |
| 89 `Version' field value hasn't been increased to indicate that we have | |
| 90 one more field for some obscure reason, we must parse the GSUB table | |
| 91 to find out whether class values refer to this table. Only then we | |
| 92 can finally load the MarkAttachClassDef structure if necessary. */ | |
| 93 | |
| 94 struct HB_GDEFHeader_ | |
| 95 { | |
| 96 HB_UShort** NewGlyphClasses; | |
| 97 HB_UInt offset; | |
| 98 HB_UInt MarkAttachClassDef_offset; | |
| 99 | |
| 100 HB_16Dot16 Version; | |
| 101 | |
| 102 HB_ClassDefinition GlyphClassDef; | |
| 103 HB_AttachList AttachList; | |
| 104 HB_LigCaretList LigCaretList; | |
| 105 HB_ClassDefinition MarkAttachClassDef; /* new in OT 1.2 */ | |
| 106 | |
| 107 HB_UShort LastGlyph; | |
| 108 }; | |
| 109 | |
| 110 typedef struct HB_GDEFHeader_ HB_GDEFHeader; | |
| 111 typedef struct HB_GDEFHeader_* HB_GDEF; | |
| 112 | |
| 113 | |
| 114 HB_Error HB_New_GDEF_Table( HB_GDEFHeader** retptr ); | |
| 115 | |
| 116 | |
| 117 HB_Error HB_Load_GDEF_Table( HB_Stream stream, | |
| 118 HB_GDEFHeader** gdef ); | |
| 119 | |
| 120 | |
| 121 HB_Error HB_Done_GDEF_Table ( HB_GDEFHeader* gdef ); | |
| 122 | |
| 123 | |
| 124 HB_Error HB_GDEF_Get_Glyph_Property( HB_GDEFHeader* gdef, | |
| 125 HB_UShort glyphID, | |
| 126 HB_UShort* property ); | |
| 127 | |
| 128 HB_Error HB_GDEF_Build_ClassDefinition( HB_GDEFHeader* gdef, | |
| 129 HB_UShort num_glyphs, | |
| 130 HB_UShort glyph_count, | |
| 131 HB_UShort* glyph_array, | |
| 132 HB_UShort* class_array ); | |
| 133 | |
| 134 #ifdef HB_USE_PACKED_STRUCTS | |
| 135 #pragma pack(pop) | |
| 136 #endif | |
| 137 | |
| 138 HB_END_HEADER | |
| 139 | |
| 140 #endif /* HARFBUZZ_GDEF_H */ | |
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