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
|
/*
* Copyright (C) 2009 Red Hat, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Red Hat Author(s): Behdad Esfahbod
*/
#include "hb-ot-shape-private.h"
#include "hb-buffer-private.h"
#include "hb-ot-layout.h"
hb_tag_t default_features[] = {
/* GSUB */
HB_TAG('c','c','m','p'),
HB_TAG('l','o','c','l'),
HB_TAG('l','i','g','a'),
HB_TAG('c','l','i','g'),
/* GPOS */
HB_TAG('k','e','r','n'),
HB_TAG('m','a','r','k'),
HB_TAG('m','k','m','k'),
};
static void
add_feature (hb_face_t *face,
hb_tag_t table_tag,
unsigned int feature_index,
unsigned int *lookups,
unsigned int *num_lookups,
unsigned int room_lookups)
{
unsigned int i = room_lookups - *num_lookups;
hb_ot_layout_feature_get_lookup_indexes (face, table_tag, feature_index, 0,
&i,
lookups + *num_lookups);
*num_lookups += i;
}
static int
cmp_lookups (const void *p1, const void *p2)
{
unsigned int a = * (const unsigned int *) p1;
unsigned int b = * (const unsigned int *) p2;
return a - b;
}
static void
setup_lookups (hb_face_t *face,
hb_buffer_t *buffer,
hb_feature_t *features,
unsigned int num_features,
hb_tag_t table_tag,
unsigned int *lookups,
unsigned int *num_lookups)
{
unsigned int i, j, script_index, language_index, feature_index, room_lookups;
room_lookups = *num_lookups;
*num_lookups = 0;
hb_ot_layout_table_choose_script (face, table_tag,
hb_ot_tags_from_script (buffer->script),
&script_index);
hb_ot_layout_script_find_language (face, table_tag, script_index,
hb_ot_tag_from_language (buffer->language),
&language_index);
if (hb_ot_layout_language_get_required_feature_index (face, table_tag, script_index, language_index,
&feature_index))
add_feature (face, table_tag, feature_index, lookups, num_lookups, room_lookups);
for (i = 0; i < ARRAY_LENGTH (default_features); i++)
{
if (hb_ot_layout_language_find_feature (face, table_tag, script_index, language_index,
default_features[i],
&feature_index))
add_feature (face, table_tag, feature_index, lookups, num_lookups, room_lookups);
}
qsort (lookups, *num_lookups, sizeof (lookups[0]), cmp_lookups);
if (*num_lookups)
{
for (i = 1, j = 0; i < *num_lookups; i++)
if (lookups[i] != lookups[j])
lookups[++j] = lookups[i];
lookups[j++] = lookups[i - 1];
*num_lookups = j;
}
}
hb_bool_t
_hb_ot_substitute_complex (hb_font_t *font HB_GNUC_UNUSED,
hb_face_t *face,
hb_buffer_t *buffer,
hb_feature_t *features,
unsigned int num_features)
{
unsigned int lookups[1000];
unsigned int num_lookups = ARRAY_LENGTH (lookups);
unsigned int i;
if (!hb_ot_layout_has_substitution (face))
return FALSE;
setup_lookups (face, buffer, features, num_features,
HB_OT_TAG_GSUB,
lookups, &num_lookups);
for (i = 0; i < num_lookups; i++)
hb_ot_layout_substitute_lookup (face, buffer, lookups[i], 0xFFFF);
return TRUE;
}
hb_bool_t
_hb_ot_position_complex (hb_font_t *font,
hb_face_t *face,
hb_buffer_t *buffer,
hb_feature_t *features,
unsigned int num_features)
{
unsigned int lookups[1000];
unsigned int num_lookups = ARRAY_LENGTH (lookups);
unsigned int i;
if (!hb_ot_layout_has_positioning (face))
return FALSE;
setup_lookups (face, buffer, features, num_features,
HB_OT_TAG_GPOS,
lookups, &num_lookups);
for (i = 0; i < num_lookups; i++)
hb_ot_layout_position_lookup (font, face, buffer, lookups[i], 0xFFFF);
hb_ot_layout_position_finish (font, face, buffer);
return TRUE;
}
|
