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
32HB_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
59typedef HB_Error (*HB_MMFunction)(HB_Font font,
60 HB_UShort metric_id,
61 HB_Fixed* metric_value,
62 void* data );
63#endif
64
65
66struct 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
86typedef struct HB_GPOSHeader_ HB_GPOSHeader;
87typedef HB_GPOSHeader* HB_GPOS;
88
89
90HB_Error HB_Load_GPOS_Table( HB_Stream stream,
91 HB_GPOSHeader** gpos,
92 HB_GDEFHeader* gdef,
93 HB_Stream gdefStream );
94
95
96HB_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos );
97
98
99HB_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
100 HB_UInt script_tag,
101 HB_UShort* script_index );
102
103HB_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
109HB_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
116HB_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
117 HB_UInt** script_tag_list );
118
119HB_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
120 HB_UShort script_index,
121 HB_UInt** language_tag_list );
122
123HB_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
129HB_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
130 HB_UShort feature_index,
131 HB_UInt property );
132
133HB_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos );
134
135
136#ifdef HB_SUPPORT_MULTIPLE_MASTER
137HB_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
146HB_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
153HB_END_HEADER
154
155#endif /* HARFBUZZ_GPOS_H */
156

source code of qtbase/src/3rdparty/harfbuzz/src/harfbuzz-gpos.h