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
|
/* Pango
* pango-ot-ruleset.c: Shaping using OpenType features
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include "pango-ot-private.h"
#include "pango-utils.h"
typedef struct _PangoOTRule PangoOTRule;
struct _PangoOTRule
{
gulong property_bit;
FT_UShort feature_index;
guint table_type : 1;
};
static void pango_ot_ruleset_class_init (GObjectClass *object_class);
static void pango_ot_ruleset_init (PangoOTRuleset *ruleset);
static void pango_ot_ruleset_finalize (GObject *object);
static GObjectClass *parent_class;
GType
pango_ot_ruleset_get_type (void)
{
static GType object_type = 0;
if (!object_type)
{
static const GTypeInfo object_info =
{
sizeof (PangoOTRulesetClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc)pango_ot_ruleset_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (PangoOTRuleset),
0, /* n_preallocs */
(GInstanceInitFunc)pango_ot_ruleset_init,
NULL /* value_table */
};
object_type = g_type_register_static (G_TYPE_OBJECT,
I_("PangoOTRuleset"),
&object_info, 0);
}
return object_type;
}
static void
pango_ot_ruleset_class_init (GObjectClass *object_class)
{
parent_class = g_type_class_peek_parent (object_class);
object_class->finalize = pango_ot_ruleset_finalize;
}
static void
pango_ot_ruleset_init (PangoOTRuleset *ruleset)
{
ruleset->rules = g_array_new (FALSE, FALSE, sizeof (PangoOTRule));
}
static void
pango_ot_ruleset_finalize (GObject *object)
{
PangoOTRuleset *ruleset = PANGO_OT_RULESET (object);
g_array_free (ruleset->rules, TRUE);
g_object_unref (ruleset->info);
parent_class->finalize (object);
}
/**
* pango_ot_ruleset_new:
* @info: a #PangoOTInfo.
*
* Creates a new #PangoOTRuleset for the given OpenType info.
*
* Return value: the newly allocated #PangoOTRuleset, which
* should be freed with g_object_unref().
**/
PangoOTRuleset *
pango_ot_ruleset_new (PangoOTInfo *info)
{
PangoOTRuleset *ruleset;
ruleset = g_object_new (PANGO_TYPE_OT_RULESET, NULL);
ruleset->info = g_object_ref (info);
return ruleset;
}
/**
* pango_ot_ruleset_add_feature:
* @ruleset: a #PangoOTRuleset.
* @table_type: the table type to add a feature to.
* @feature_index: the index of the feature to add.
* @property_bit: the property bit to use for this feature. Used to identify
* the glyphs that this feature should be applied to.
*
* Adds a feature to the ruleset.
**/
void
pango_ot_ruleset_add_feature (PangoOTRuleset *ruleset,
PangoOTTableType table_type,
guint feature_index,
gulong property_bit)
{
PangoOTRule tmp_rule;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
tmp_rule.table_type = table_type;
tmp_rule.feature_index = feature_index;
tmp_rule.property_bit = property_bit;
g_array_append_val (ruleset->rules, tmp_rule);
}
/**
* pango_ot_ruleset_substitute:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GSUB substitution on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_substitute (PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
TTO_GSUB gsub = NULL;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GSUB)
continue;
if (!gsub)
{
gsub = pango_ot_info_get_gsub (ruleset->info);
if (gsub)
TT_GSUB_Clear_Features (gsub);
else
return;
}
TT_GSUB_Add_Feature (gsub, rule->feature_index, rule->property_bit);
}
TT_GSUB_Apply_String (gsub, buffer->buffer);
}
/**
* pango_ot_ruleset_position:
* @ruleset: a #PangoOTRuleset.
* @buffer: a #PangoOTBuffer.
*
* Performs the OpenType GPOS positionoing on @buffer using the features
* in @ruleset
*
* Since: 1.4
**/
void
pango_ot_ruleset_position (PangoOTRuleset *ruleset,
PangoOTBuffer *buffer)
{
unsigned int i;
TTO_GPOS gpos = NULL;
g_return_if_fail (PANGO_OT_IS_RULESET (ruleset));
for (i = 0; i < ruleset->rules->len; i++)
{
PangoOTRule *rule = &g_array_index (ruleset->rules, PangoOTRule, i);
if (rule->table_type != PANGO_OT_TABLE_GPOS)
continue;
if (!gpos)
{
gpos = pango_ot_info_get_gpos (ruleset->info);
if (gpos)
TT_GPOS_Clear_Features (gpos);
else
return;
}
TT_GPOS_Add_Feature (gpos, rule->feature_index, rule->property_bit);
}
if (TT_GPOS_Apply_String (ruleset->info->face, gpos, 0, buffer->buffer,
FALSE /* enable device-dependant values */,
buffer->rtl) == FT_Err_Ok)
buffer->applied_gpos = TRUE;
}
|
