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 | /* Lookup types for glyph substitution */ |
35 | |
36 | #define HB_GSUB_LOOKUP_SINGLE 1 |
37 | #define HB_GSUB_LOOKUP_MULTIPLE 2 |
38 | #define HB_GSUB_LOOKUP_ALTERNATE 3 |
39 | #define HB_GSUB_LOOKUP_LIGATURE 4 |
40 | #define HB_GSUB_LOOKUP_CONTEXT 5 |
41 | #define HB_GSUB_LOOKUP_CHAIN 6 |
42 | #define HB_GSUB_LOOKUP_EXTENSION 7 |
43 | #define HB_GSUB_LOOKUP_REVERSE_CHAIN 8 |
44 | |
45 | |
46 | /* A pointer to a function which selects the alternate glyph. `pos' is |
47 | the position of the glyph with index `glyphID', `num_alternates' |
48 | gives the number of alternates in the `alternates' array. `data' |
49 | points to the user-defined structure specified during a call to |
50 | HB_GSUB_Register_Alternate_Function(). The function must return an |
51 | index into the `alternates' array. */ |
52 | |
53 | typedef HB_UShort (*HB_AltFunction)(HB_UInt pos, |
54 | HB_UShort glyphID, |
55 | HB_UShort num_alternates, |
56 | HB_UShort* alternates, |
57 | void* data ); |
58 | |
59 | |
60 | struct |
61 | { |
62 | HB_GDEFHeader* ; |
63 | |
64 | /* the next two fields are used for an alternate substitution callback |
65 | function to select the proper alternate glyph. */ |
66 | |
67 | void* ; |
68 | HB_AltFunction ; |
69 | |
70 | HB_UInt ; |
71 | |
72 | HB_16Dot16 ; |
73 | |
74 | HB_ScriptList ; |
75 | HB_FeatureList ; |
76 | HB_LookupList ; |
77 | }; |
78 | |
79 | typedef struct HB_GSUBHeader_ ; |
80 | typedef HB_GSUBHeader* HB_GSUB; |
81 | |
82 | |
83 | HB_Error HB_Load_GSUB_Table( HB_Stream stream, |
84 | HB_GSUBHeader** gsub, |
85 | HB_GDEFHeader* gdef, |
86 | HB_Stream gdefStream ); |
87 | |
88 | |
89 | HB_Error HB_Done_GSUB_Table( HB_GSUBHeader* gsub ); |
90 | |
91 | |
92 | HB_Error HB_GSUB_Select_Script( HB_GSUBHeader* gsub, |
93 | HB_UInt script_tag, |
94 | HB_UShort* script_index ); |
95 | |
96 | HB_Error HB_GSUB_Select_Language( HB_GSUBHeader* gsub, |
97 | HB_UInt language_tag, |
98 | HB_UShort script_index, |
99 | HB_UShort* language_index, |
100 | HB_UShort* req_feature_index ); |
101 | |
102 | HB_Error HB_GSUB_Select_Feature( HB_GSUBHeader* gsub, |
103 | HB_UInt feature_tag, |
104 | HB_UShort script_index, |
105 | HB_UShort language_index, |
106 | HB_UShort* feature_index ); |
107 | |
108 | |
109 | HB_Error HB_GSUB_Query_Scripts( HB_GSUBHeader* gsub, |
110 | HB_UInt** script_tag_list ); |
111 | |
112 | HB_Error HB_GSUB_Query_Languages( HB_GSUBHeader* gsub, |
113 | HB_UShort script_index, |
114 | HB_UInt** language_tag_list ); |
115 | |
116 | HB_Error HB_GSUB_Query_Features( HB_GSUBHeader* gsub, |
117 | HB_UShort script_index, |
118 | HB_UShort language_index, |
119 | HB_UInt** feature_tag_list ); |
120 | |
121 | |
122 | HB_Error HB_GSUB_Add_Feature( HB_GSUBHeader* gsub, |
123 | HB_UShort feature_index, |
124 | HB_UInt property ); |
125 | |
126 | HB_Error HB_GSUB_Clear_Features( HB_GSUBHeader* gsub ); |
127 | |
128 | |
129 | HB_Error HB_GSUB_Register_Alternate_Function( HB_GSUBHeader* gsub, |
130 | HB_AltFunction altfunc, |
131 | void* data ); |
132 | |
133 | |
134 | HB_Error HB_GSUB_Apply_String( HB_GSUBHeader* gsub, |
135 | HB_Buffer buffer ); |
136 | |
137 | HB_END_HEADER |
138 | |
139 | #endif /* HARFBUZZ_GSUB_H */ |
140 | |