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 - Myanmar module
* myanmar.c:
*
* Copyright (C) 2000 SuSE Linux Ltd
* Author: Robert Brady <robert@suse.co.uk>
*
* 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.
*/
/*
* This is the renderer for the Burmese (Myanmar) script. This
* script is used to write the following languages :
*
* my Burmese
* shn Shan
* mkh Mon
* pi Pali
*
*/
#include <glib.h>
#include <stdio.h>
#include <string.h>
#include "pangox.h"
#include "pango-indic.h"
#include "pango-engine.h"
#define RANGE_START 0x1000
#define RANGE_SIZE 0x80
#define SCRIPT_STRING "Myanmar"
#define SCRIPT_ENGINE_NAME SCRIPT_STRING "ScriptEngineX"
#define VIRAMA 0x1039
#include "pango-indic-script.h"
static gboolean is_prefixing_vowel (gunichar i);
static gboolean is_vowel_sign (gunichar i);
static gunichar vowel_sign_to_matra (gunichar i);
static PangoIndicScript script = {
SCRIPT_STRING,
&is_prefixing_vowel,
&is_vowel_sign,
&vowel_sign_to_matra,
};
static char *default_charset = "iso10646-brm";
static PangoEngineRange pango_indic_range[] =
{
{RANGE_START, RANGE_END, "*"},
};
SCRIPT_ENGINE_DEFINITION
static PangoCoverage *
pango_engine_get_coverage (PangoFont * font, PangoLanguage *lang)
{
gunichar i;
PangoCoverage *result = pango_coverage_new ();
PangoXSubfont subfont;
int dev_font = pango_x_find_first_subfont (font, &default_charset, 1, &subfont);
if (dev_font)
{
for (i = RANGE_START; i <= RANGE_END; i++)
pango_coverage_set (result, i, PANGO_COVERAGE_EXACT);
}
return result;
}
static gboolean
is_vowel_sign (gunichar i)
{
/* one that combines, whether or not it spaces */
return (i >= 0x102c && i <= 0x1032) || (i >= 0x1056 && i <= 0x1059);
}
static gunichar
vowel_sign_to_matra (gunichar i)
{
if (i >= 0x102d && i <= 0x1032)
return i - 0x102d + 0x1023;
return i;
}
static int
is_consonant (int i)
{
return (i >= 0x1000 && i <= 0x1020) || (i >= 0x1052 && i <= 0x1053);
}
static int
is_ind_vowel (int i)
{
return (i >= 0x1021 && i <= 0x102a);
}
static int
is_prefixing_vowel (gunichar what)
{
return (what == 0x1031);
}
static void
pango_engine_shape (PangoFont * font,
const char *text,
int length,
PangoAnalysis * analysis, PangoGlyphString * glyphs)
{
PangoXSubfont subfont;
int n_chars, n_glyph;
int lvl;
int i;
gunichar *wc;
int sb;
int n_syls;
gunichar **syls = g_new (gunichar *, 2);
g_return_if_fail (font != NULL);
g_return_if_fail (text != NULL);
g_return_if_fail (length >= 0);
g_return_if_fail (analysis != NULL);
n_chars = n_glyph = g_utf8_strlen (text, length);
lvl = pango_x_find_first_subfont (font, &default_charset, 1, &subfont);
if (!lvl)
{
pango_x_fallback_shape (font, glyphs, text, n_chars);
return;
}
pango_indic_split_out_characters (&script, text, n_chars, &wc,
&n_glyph, glyphs);
pango_indic_convert_vowels (&script, FALSE, &n_glyph, wc, FALSE);
n_syls = 1;
syls[0] = wc;
sb = glyphs->log_clusters[0];
for (i = 0; i < n_glyph; i++)
{
if (i && (is_consonant (wc[i]) | is_ind_vowel (wc[i]))
&& wc[i - 1] != VIRAMA)
{
syls = g_renew (gunichar *, syls, n_syls + 2);
syls[n_syls] = wc + i;
n_syls++;
sb = glyphs->log_clusters[i];
}
glyphs->log_clusters[i] = sb;
}
syls[n_syls] = wc + i;
for (i = 0; i < n_syls; i++)
{
pango_indic_shift_vowels (&script, syls[i], syls[i + 1]);
}
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
while ((i=pango_x_apply_ligatures (font, subfont, &wc, &n_glyph, &glyphs->log_clusters)))
{
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
}
pango_indic_compact (&script, &n_glyph, wc, glyphs->log_clusters);
pango_glyph_string_set_size (glyphs, n_glyph);
for (i = 0; i < n_glyph; i++)
{
PangoRectangle logical_rect;
glyphs->glyphs[i].glyph = PANGO_X_MAKE_GLYPH (subfont, wc[i]);
pango_font_get_glyph_extents (font, glyphs->glyphs[i].glyph,
NULL, &logical_rect);
glyphs->glyphs[i].geometry.x_offset = 0;
glyphs->glyphs[i].geometry.y_offset = 0;
glyphs->glyphs[i].geometry.width = logical_rect.width;
}
g_free (syls);
}
static PangoEngine *
pango_engine_x_new ()
{
PangoEngineShape *result;
result = g_new (PangoEngineShape, 1);
result->engine.id = SCRIPT_ENGINE_NAME;
result->engine.type = PANGO_ENGINE_TYPE_SHAPE;
result->engine.length = sizeof (result);
result->script_shape = pango_engine_shape;
result->get_coverage = pango_engine_get_coverage;
return (PangoEngine *) result;
}
void
PANGO_MODULE_ENTRY(list) (PangoEngineInfo **engines,
int *n_engines)
{
*engines = script_engines;
*n_engines = n_script_engines;
}
PangoEngine *
PANGO_MODULE_ENTRY(load) (const char *id)
{
if (!strcmp (id, SCRIPT_ENGINE_NAME))
return pango_engine_x_new ();
else
return NULL;
}
void
PANGO_MODULE_ENTRY(unload) (PangoEngine * engine)
{
}
|
