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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
/*******************************************************************
*
* ftxgdef.h
*
* TrueType Open GDEF table support
*
* Copyright 1996-2000 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used
* modified and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
******************************************************************/
#ifndef FTXOPEN_H
#error "Don't include this file! Use ftxopen.h instead."
#endif
#ifndef FTXGDEF_H
#define FTXGDEF_H
#ifdef __cplusplus
extern "C" {
#endif
#define TTO_Err_Invalid_GDEF_SubTable_Format 0x1030
#define TTO_Err_Invalid_GDEF_SubTable 0x1031
/* GDEF glyph classes */
#define UNCLASSIFIED_GLYPH 0
#define SIMPLE_GLYPH 1
#define LIGATURE_GLYPH 2
#define MARK_GLYPH 3
#define COMPONENT_GLYPH 4
/* GDEF glyph properties, corresponding to class values 1-4. Note that
TTO_COMPONENT has no corresponding flag in the LookupFlag field. */
#define TTO_BASE_GLYPH 0x0002
#define TTO_LIGATURE 0x0004
#define TTO_MARK 0x0008
#define TTO_COMPONENT 0x0010
/* Attachment related structures */
struct TTO_AttachPoint_
{
FT_UShort PointCount; /* size of the PointIndex array */
FT_UShort* PointIndex; /* array of contour points */
};
typedef struct TTO_AttachPoint_ TTO_AttachPoint;
struct TTO_AttachList_
{
FT_Bool loaded;
TTO_Coverage Coverage; /* Coverage table */
FT_UShort GlyphCount; /* number of glyphs with
attachments */
TTO_AttachPoint* AttachPoint; /* array of AttachPoint tables */
};
typedef struct TTO_AttachList_ TTO_AttachList;
/* Ligature Caret related structures */
struct TTO_CaretValueFormat1_
{
FT_Short Coordinate; /* x or y value (in design units) */
};
typedef struct TTO_CaretValueFormat1_ TTO_CaretValueFormat1;
struct TTO_CaretValueFormat2_
{
FT_UShort CaretValuePoint; /* contour point index on glyph */
};
typedef struct TTO_CaretValueFormat2_ TTO_CaretValueFormat2;
struct TTO_CaretValueFormat3_
{
FT_Short Coordinate; /* x or y value (in design units) */
TTO_Device Device; /* Device table for x or y value */
};
typedef struct TTO_CaretValueFormat3_ TTO_CaretValueFormat3;
struct TTO_CaretValueFormat4_
{
FT_UShort IdCaretValue; /* metric ID */
};
typedef struct TTO_CaretValueFormat4_ TTO_CaretValueFormat4;
struct TTO_CaretValue_
{
FT_UShort CaretValueFormat; /* 1, 2, 3, or 4 */
union
{
TTO_CaretValueFormat1 cvf1;
TTO_CaretValueFormat2 cvf2;
TTO_CaretValueFormat3 cvf3;
TTO_CaretValueFormat4 cvf4;
} cvf;
};
typedef struct TTO_CaretValue_ TTO_CaretValue;
struct TTO_LigGlyph_
{
FT_Bool loaded;
FT_UShort CaretCount; /* number of caret values */
TTO_CaretValue* CaretValue; /* array of caret values */
};
typedef struct TTO_LigGlyph_ TTO_LigGlyph;
struct TTO_LigCaretList_
{
FT_Bool loaded;
TTO_Coverage Coverage; /* Coverage table */
FT_UShort LigGlyphCount; /* number of ligature glyphs */
TTO_LigGlyph* LigGlyph; /* array of LigGlyph tables */
};
typedef struct TTO_LigCaretList_ TTO_LigCaretList;
/* The `NewGlyphClasses' field is not defined in the TTO specification.
We use it for fonts with a constructed `GlyphClassDef' structure
(i.e., which don't have a GDEF table) to collect glyph classes
assigned during the lookup process. The number of arrays in this
pointer array is GlyphClassDef->cd.cd2.ClassRangeCount+1; the nth
array then contains the glyph class values of the glyphs not covered
by the ClassRangeRecords structures with index n-1 and n. We store
glyph class values for four glyphs in a single array element.
`LastGlyph' is identical to the number of glyphs minus one in the
font; we need it only if `NewGlyphClasses' is not NULL (to have an
upper bound for the last array).
Note that we first store the file offset to the `MarkAttachClassDef'
field (which has been introduced in OpenType 1.2) -- since the
`Version' field value hasn't been increased to indicate that we have
one more field for some obscure reason, we must parse the GSUB table
to find out whether class values refer to this table. Only then we
can finally load the MarkAttachClassDef structure if necessary. */
struct TTO_GDEFHeader_
{
FT_Memory memory;
FT_ULong offset;
FT_Fixed Version;
TTO_ClassDefinition GlyphClassDef;
TTO_AttachList AttachList;
TTO_LigCaretList LigCaretList;
FT_ULong MarkAttachClassDef_offset;
TTO_ClassDefinition MarkAttachClassDef; /* new in OT 1.2 */
FT_UShort LastGlyph;
FT_UShort** NewGlyphClasses;
};
typedef struct TTO_GDEFHeader_ TTO_GDEFHeader;
typedef struct TTO_GDEFHeader_* TTO_GDEF;
/* finally, the GDEF API */
/* EXPORT_DEF
FT_Error TT_Init_GDEF_Extension( TT_Engine engine ); */
EXPORT_FUNC
FT_Error TT_New_GDEF_Table( FT_Face face,
TTO_GDEFHeader** retptr );
EXPORT_DEF
FT_Error TT_Load_GDEF_Table( FT_Face face,
TTO_GDEFHeader** gdef );
EXPORT_DEF
FT_Error TT_Done_GDEF_Table ( TTO_GDEFHeader* gdef );
EXPORT_DEF
FT_Error TT_GDEF_Get_Glyph_Property( TTO_GDEFHeader* gdef,
FT_UShort glyphID,
FT_UShort* property );
EXPORT_DEF
FT_Error TT_GDEF_Build_ClassDefinition( TTO_GDEFHeader* gdef,
FT_UShort num_glyphs,
FT_UShort glyph_count,
FT_UShort* glyph_array,
FT_UShort* class_array );
#ifdef __cplusplus
}
#endif
#endif /* FTXGDEF_H */
/* END */
|
