1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/*******************************************************************
*
* Copyright 1996-2000 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* Copyright 2006 Behdad Esfahbod
*
* This is part of HarfBuzz, an OpenType Layout engine library.
*
* See the file name COPYING for licensing information.
*
******************************************************************/
#ifndef HARFBUZZ_GPOS_H
#define HARFBUZZ_GPOS_H
#include "harfbuzz-gdef.h"
#include "harfbuzz-buffer.h"
FT_BEGIN_HEADER
#define HB_Err_Invalid_GPOS_SubTable_Format 0x1020
#define HB_Err_Invalid_GPOS_SubTable 0x1021
/* Lookup types for glyph positioning */
#define HB_GPOS_LOOKUP_SINGLE 1
#define HB_GPOS_LOOKUP_PAIR 2
#define HB_GPOS_LOOKUP_CURSIVE 3
#define HB_GPOS_LOOKUP_MARKBASE 4
#define HB_GPOS_LOOKUP_MARKLIG 5
#define HB_GPOS_LOOKUP_MARKMARK 6
#define HB_GPOS_LOOKUP_CONTEXT 7
#define HB_GPOS_LOOKUP_CHAIN 8
#define HB_GPOS_LOOKUP_EXTENSION 9
/* A pointer to a function which loads a glyph. Its parameters are
the same as in a call to Load_Glyph() -- if no glyph loading
function will be registered with HB_GPOS_Register_Glyph_Function(),
Load_Glyph() will be called indeed. The purpose of this function
pointer is to provide a hook for caching glyph outlines and sbits
(using the instance's generic pointer to hold the data).
If for some reason no outline data is available (e.g. for an
embedded bitmap glyph), _glyph->outline.n_points should be set to
zero. _glyph can be computed with
_glyph = HANDLE_Glyph( glyph ) */
typedef FT_Error (*HB_GlyphFunction)(FT_Face face,
FT_UInt glyphIndex,
FT_Int loadFlags );
/* A pointer to a function which accesses the PostScript interpreter.
Multiple Master fonts need this interface to convert a metric ID
(as stored in an OpenType font version 1.2 or higher) `metric_id'
into a metric value (returned in `metric_value').
`data' points to the user-defined structure specified during a
call to HB_GPOS_Register_MM_Function().
`metric_value' must be returned as a scaled value (but shouldn't
be rounded). */
typedef FT_Error (*HB_MMFunction)(FT_Face face,
FT_UShort metric_id,
FT_Pos* metric_value,
void* data );
struct HB_GPOSHeader_
{
FT_Memory memory;
FT_Fixed Version;
HB_ScriptList ScriptList;
HB_FeatureList FeatureList;
HB_LookupList LookupList;
HB_GDEFHeader* gdef;
/* the next field is used for a callback function to get the
glyph outline. */
HB_GlyphFunction gfunc;
/* this is OpenType 1.2 -- Multiple Master fonts need this
callback function to get various metric values from the
PostScript interpreter. */
HB_MMFunction mmfunc;
void* data;
};
typedef struct HB_GPOSHeader_ HB_GPOSHeader;
typedef HB_GPOSHeader* HB_GPOS;
FT_Error HB_Load_GPOS_Table( FT_Face face,
HB_GPOSHeader** gpos,
HB_GDEFHeader* gdef );
FT_Error HB_Done_GPOS_Table( HB_GPOSHeader* gpos );
FT_Error HB_GPOS_Select_Script( HB_GPOSHeader* gpos,
FT_ULong script_tag,
FT_UShort* script_index );
FT_Error HB_GPOS_Select_Language( HB_GPOSHeader* gpos,
FT_ULong language_tag,
FT_UShort script_index,
FT_UShort* language_index,
FT_UShort* req_feature_index );
FT_Error HB_GPOS_Select_Feature( HB_GPOSHeader* gpos,
FT_ULong feature_tag,
FT_UShort script_index,
FT_UShort language_index,
FT_UShort* feature_index );
FT_Error HB_GPOS_Query_Scripts( HB_GPOSHeader* gpos,
FT_ULong** script_tag_list );
FT_Error HB_GPOS_Query_Languages( HB_GPOSHeader* gpos,
FT_UShort script_index,
FT_ULong** language_tag_list );
FT_Error HB_GPOS_Query_Features( HB_GPOSHeader* gpos,
FT_UShort script_index,
FT_UShort language_index,
FT_ULong** feature_tag_list );
FT_Error HB_GPOS_Add_Feature( HB_GPOSHeader* gpos,
FT_UShort feature_index,
FT_UInt property );
FT_Error HB_GPOS_Clear_Features( HB_GPOSHeader* gpos );
FT_Error HB_GPOS_Register_Glyph_Function( HB_GPOSHeader* gpos,
HB_GlyphFunction gfunc );
FT_Error HB_GPOS_Register_MM_Function( HB_GPOSHeader* gpos,
HB_MMFunction mmfunc,
void* data );
/* If `dvi' is TRUE, glyph contour points for anchor points and device
tables are ignored -- you will get device independent values. */
FT_Error HB_GPOS_Apply_String( FT_Face face,
HB_GPOSHeader* gpos,
FT_UShort load_flags,
HB_Buffer buffer,
FT_Bool dvi,
FT_Bool r2l );
FT_END_HEADER
#endif /* HARFBUZZ_GPOS_H */
|
