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
225
226
227
228
229
230
231
232
233
234
235
236
|
#include "afglobal.h"
#include "afdummy.h"
#include "aflatin.h"
/* populate this list when you add new scripts
*/
static AF_ScriptClass const af_script_classes[] =
{
& af_dummy_script_class,
& af_latin_script_class,
NULL /* do not remove */
};
#define AF_SCRIPT_LIST_DEFAULT 1 /* index of default script in 'af_script_classes' */
#define AF_SCRIPT_LIST_NONE 255 /* indicates an uncovered glyph */
/*
* note that glyph_scripts[] is used to map each glyph into
* an index into the 'af_script_classes' array.
*
*/
typedef struct AF_FaceGlobalsRec_
{
FT_Face face;
FT_UInt glyph_count; /* same as face->num_glyphs */
FT_Byte* glyph_scripts;
AF_ScriptMetrics metrics[ AF_SCRIPT_MAX ];
} AF_FaceGlobalsRec;
/* this function is used to compute the script index of each glyph
* within a given face
*/
static FT_Error
af_face_globals_compute_script_coverage( AF_FaceGlobals globals )
{
FT_Error error = 0;
FT_Face face = globals->face;
FT_CharMap old_charmap = face->charmap;
FT_Byte* gscripts = globals->glyph_scripts;
FT_UInt ss;
/* the value 255 means "uncovered glyph"
*/
FT_MEM_SET( globals->glyph_scripts,
AF_SCRIPT_LIST_NONE,
globals->glyph_count );
error = FT_Select_Charmap( face, FT_ENCODING_UNICODE );
if ( error )
{
/* ignore this error, we'll simply use Latin as the standard
* script. XXX: Shouldn't we rather disable hinting ??
*/
error = 0;
goto Exit;
}
/* scan each script in a Unicode charmap
*/
for ( ss = 0; af_script_classes[ss]; ss++ )
{
AF_ScriptClass clazz = af_script_classes[ss];
AF_Script_UniRange range;
if ( clazz->script_uni_ranges == NULL )
continue;
/* scan all unicode points in the range, and set the corresponding
* glyph script index
*/
for ( range = clazz->script_uni_ranges; range->first != 0; range++ )
{
FT_ULong charcode = range->first;
FT_UInt gindex;
gindex = FT_Get_Char_Index( face, charcode );
if ( gindex != 0 &&
gindex < globals->glyph_count &&
gscripts[ gindex ] == AF_SCRIPT_LIST_NONE )
{
gscripts[ gindex ] = (FT_Byte) ss;
}
for (;;)
{
charcode = FT_Get_Next_Char( face, charcode, &gindex );
if ( gindex == 0 || charcode > range->last )
break;
if ( gindex < globals->glyph_count &&
gscripts[ gindex ] == AF_SCRIPT_LIST_NONE )
{
gscripts[ gindex ] = (FT_Byte) ss;
}
}
}
}
Exit:
/* by default, all uncovered glyphs are set to the latin script
* XXX: shouldnt' we disable hinting or do something similar ?
*/
{
FT_UInt nn;
for ( nn = 0; nn < globals->glyph_count; nn++ )
{
if ( gscripts[ nn ] == AF_SCRIPT_LIST_NONE )
gscripts[ nn ] = AF_SCRIPT_LIST_DEFAULT;
}
}
FT_Set_Charmap( face, old_charmap );
return error;
}
FT_LOCAL_DEF( FT_Error )
af_face_globals_new( FT_Face face,
AF_FaceGlobals *aglobals )
{
FT_Error error;
FT_Memory memory;
AF_FaceGlobals globals;
memory = face->memory;
if ( !FT_ALLOC( globals, sizeof(*globals) +
face->num_glyphs*sizeof(FT_Byte) ) )
{
globals->face = face;
globals->glyph_count = face->num_glyphs;
globals->glyph_scripts = (FT_Byte*)( globals+1 );
error = af_face_globals_compute_script_coverage( globals );
if ( error )
{
af_face_globals_free( globals );
globals = NULL;
}
}
*aglobals = globals;
return error;
}
FT_LOCAL_DEF( void )
af_face_globals_free( AF_FaceGlobals globals )
{
if ( globals )
{
FT_Memory memory = globals->face->memory;
FT_UInt nn;
for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ )
{
if ( globals->metrics[nn] )
{
AF_ScriptClass clazz = af_script_classes[nn];
FT_ASSERT( globals->metrics[nn]->clazz == clazz );
if ( clazz->script_metrics_done )
clazz->script_metrics_done( globals->metrics[nn] );
FT_FREE( globals->metrics[nn] );
}
}
globals->glyph_count = 0;
globals->glyph_scripts = NULL; /* no need to free this one !! */
globals->face = NULL;
FT_FREE( globals );
}
}
FT_LOCAL_DEF( FT_Error )
af_face_globals_get_metrics( AF_FaceGlobals globals,
FT_UInt gindex,
AF_ScriptMetrics *ametrics )
{
AF_ScriptMetrics metrics = NULL;
FT_UInt index;
AF_ScriptClass clazz;
FT_Error error = 0;
if ( gindex >= globals->glyph_count )
{
error = FT_Err_Invalid_Argument;
goto Exit;
}
index = globals->glyph_scripts[ gindex ];
clazz = af_script_classes[ index ];
metrics = globals->metrics[ clazz->script ];
if ( metrics == NULL )
{
/* create the global metrics object when needed
*/
FT_Memory memory = globals->face->memory;
if ( FT_ALLOC( metrics, clazz->script_metrics_size ) )
goto Exit;
metrics->clazz = clazz;
if ( clazz->script_metrics_init )
{
error = clazz->script_metrics_init( metrics, globals->face );
if ( error )
{
if ( clazz->script_metrics_done )
clazz->script_metrics_done( metrics );
FT_FREE( metrics );
goto Exit;
}
}
globals->metrics[ clazz->script ] = metrics;
}
Exit:
*ametrics = metrics;
return error;
}
|
