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
|
/* -*- mode: C; c-file-style: "gnu" -*- */
/* Pango
* pango-glyph-item.c: Pair of PangoItem and a glyph string
*
* Copyright (C) 2002 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 <string.h>
#include "pango-glyph-item.h"
/**
* pango_glyph_item_split:
* @orig: a #PangoItem
* @text: text to which positions in @orig apply.
* @split_index: byte index of position to split item, relative to the start of the item
*
* Modifies @orig to cover only the text after @split_index, and
* returns a new item that covers the text before @split_index that
* used to be in @orig. You can think of @split_index as the length of
* the returned item. @split_index may not be 0, and it may not be
* greater than or equal to the length of @orig (that is, there must
* be at least one byte assigned to each item, you can't create a
* zero-length item).
*
* This function is similar in function to pango_item_split() (and uses
* it internally)
*
* Return value: new item representing text before @split_index
**/
PangoGlyphItem *
pango_glyph_item_split (PangoGlyphItem *orig,
const char *text,
int split_index)
{
PangoGlyphItem *new;
int i;
int num_glyphs;
int num_remaining;
int split_offset;
gboolean ltr = (orig->item->analysis.level % 2) == 0;
g_return_val_if_fail (orig != NULL, NULL);
g_return_val_if_fail (orig->item->length > 0, NULL);
g_return_val_if_fail (split_index > 0, NULL);
g_return_val_if_fail (split_index < orig->item->length, NULL);
if (ltr)
{
for (i = 0; i < orig->glyphs->num_glyphs; i++)
{
if (orig->glyphs->log_clusters[i] >= split_index)
break;
}
if (i == orig->glyphs->num_glyphs) /* No splitting necessary */
return NULL;
split_index = orig->glyphs->log_clusters[i];
num_glyphs = i;
}
else
{
for (i = orig->glyphs->num_glyphs - 1; i >= 0; i--)
{
if (orig->glyphs->log_clusters[i] >= split_index)
break;
}
if (i < 0) /* No splitting necessary */
return NULL;
split_index = orig->glyphs->log_clusters[i];
num_glyphs = orig->glyphs->num_glyphs - 1 - i;
}
num_remaining = orig->glyphs->num_glyphs - num_glyphs;
new = g_new (PangoGlyphItem, 1);
split_offset = g_utf8_pointer_to_offset (text + orig->item->offset,
text + orig->item->offset + split_index);
new->item = pango_item_split (orig->item, split_index, split_offset);
new->glyphs = pango_glyph_string_new ();
pango_glyph_string_set_size (new->glyphs, num_glyphs);
if (ltr)
{
memcpy (new->glyphs->glyphs, orig->glyphs->glyphs, num_glyphs * sizeof (PangoGlyphInfo));
memcpy (new->glyphs->log_clusters, orig->glyphs->log_clusters, num_glyphs * sizeof (int));
memmove (orig->glyphs->glyphs, orig->glyphs->glyphs + num_glyphs,
num_remaining * sizeof (PangoGlyphInfo));
for (i = num_glyphs; i < orig->glyphs->num_glyphs; i++)
orig->glyphs->log_clusters[i - num_glyphs] = orig->glyphs->log_clusters[i] - split_index;
}
else
{
memcpy (new->glyphs->glyphs, orig->glyphs->glyphs + num_remaining, num_glyphs * sizeof (PangoGlyphInfo));
memcpy (new->glyphs->log_clusters, orig->glyphs->log_clusters + num_remaining, num_glyphs * sizeof (int));
for (i = 0; i < num_remaining; i++)
orig->glyphs->log_clusters[i] = orig->glyphs->log_clusters[i] - split_index;
}
pango_glyph_string_set_size (orig->glyphs, orig->glyphs->num_glyphs - num_glyphs);
return new;
}
static void
append_attrs (PangoGlyphItem *glyph_item,
GSList *attrs)
{
glyph_item->item->analysis.extra_attrs =
g_slist_concat (glyph_item->item->analysis.extra_attrs, attrs);
}
/**
* pango_glyph_item_apply_attrs:
* @glyph_item: a shaped item
* @text: text that @list applies to
* @list: a #PangoAttrList
*
* Splits a shaped item (PangoGlyphItem) into multiple items based
* on an attribute list. The idea is that if you have attributes
* that don't affect shaping, such as color or underline, to avoid
* affecting shaping, you filter them out (pango_attr_list_filter()),
* apply the shaping process and then reapply them to the result using
* this function.
*
* This function takes ownership of @glyph_item; it will be reused
* as one of the elements in the list.
*
* Return value: a list of glyph items resulting from splitting
* @glyph_item. Free the elements using pango_glyph_item_free(),
* the list using g_slist_free().
**/
GSList *
pango_glyph_item_apply_attrs (PangoGlyphItem *glyph_item,
const char *text,
PangoAttrList *list)
{
PangoAttrIterator *iter = pango_attr_list_get_iterator (list);
PangoGlyphItem *new;
GSList *result = NULL;
int start;
int end;
gboolean ltr = (glyph_item->item->analysis.level % 2) == 0;
while (TRUE)
{
pango_attr_iterator_range (iter, &start, &end);
if (start > glyph_item->item->offset)
{
if (start >= glyph_item->item->offset + glyph_item->item->length)
break;
new = pango_glyph_item_split (glyph_item, text,
start - glyph_item->item->offset);
result = g_slist_prepend (result, new);
}
if (end > glyph_item->item->offset)
{
if (end >= glyph_item->item->offset + glyph_item->item->length)
{
append_attrs (glyph_item, pango_attr_iterator_get_attrs (iter));
break;
}
new = pango_glyph_item_split (glyph_item, text,
end - glyph_item->item->offset);
append_attrs (new, pango_attr_iterator_get_attrs (iter));
result = g_slist_prepend (result, new);
}
if (!pango_attr_iterator_next (iter))
break;
}
result = g_slist_prepend (result, glyph_item);
if (ltr)
result = g_slist_reverse (result);
return result;
}
|
