2 * Copyright (C) 1998-2004 David Turner and Werner Lemberg
3 * Copyright (C) 2006 Behdad Esfahbod
5 * This is part of HarfBuzz, an OpenType Layout engine library.
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.
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
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.
26 #ifndef HARFBUZZ_GPOS_H
27 #define HARFBUZZ_GPOS_H
29 #include "harfbuzz-gdef.h"
30 #include "harfbuzz-buffer.h"
35 /* Lookup types for glyph positioning */
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
47 /* A pointer to a function which accesses the PostScript interpreter.
48 Multiple Master fonts need this interface to convert a metric ID
49 (as stored in an OpenType font version 1.2 or higher) `metric_id'
50 into a metric value (returned in `metric_value').
52 `data' points to the user-defined structure specified during a
53 call to HB_GPOS_Register_MM_Function().
55 `metric_value' must be returned as a scaled value (but shouldn't
58 typedef HB_Error (*HB_MMFunction)(HB_Font font,
60 HB_Fixed* metric_value,
68 HB_ScriptList ScriptList;
69 HB_FeatureList FeatureList;
70 HB_LookupList LookupList;
74 /* this is OpenType 1.2 -- Multiple Master fonts need this
75 callback function to get various metric values from the
76 PostScript interpreter. */
82 typedef struct HB_GPOSHeader_ HB_GPOSHeader;
83 typedef HB_GPOSHeader* HB_GPOS;
86 HB_Error HB_Load_GPOS_Table( HB_Stream stream,
89 HB_Stream gdefStream );
92 HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos );
95 HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
97 HB_UShort* script_index );
99 HB_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos,
100 HB_UInt language_tag,
101 HB_UShort script_index,
102 HB_UShort* language_index,
103 HB_UShort* req_feature_index );
105 HB_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos,
107 HB_UShort script_index,
108 HB_UShort language_index,
109 HB_UShort* feature_index );
112 HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
113 HB_UInt** script_tag_list );
115 HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
116 HB_UShort script_index,
117 HB_UInt** language_tag_list );
119 HB_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos,
120 HB_UShort script_index,
121 HB_UShort language_index,
122 HB_UInt** feature_tag_list );
125 HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
126 HB_UShort feature_index,
129 HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos );
132 HB_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos,
133 HB_MMFunction mmfunc,
136 /* If `dvi' is TRUE, glyph contour points for anchor points and device
137 tables are ignored -- you will get device independent values. */
140 HB_Error HB_GPOS_Apply_String( HB_Font font,
142 HB_UShort load_flags,
149 #endif /* HARFBUZZ_GPOS_H */