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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
|
/* Pango
* pango-fontset.c:
*
* Copyright (C) 2001 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.
*/
/*
* PangoFontset
*/
#include "pango-types.h"
#include "pango-font.h"
#include "pango-fontset.h"
#include "pango-impl-utils.h"
#include "pango-utils.h"
static PangoFontMetrics *pango_fontset_real_get_metrics (PangoFontset *fontset);
static void
pango_fontset_class_init (PangoFontsetClass *class)
{
class->get_metrics = pango_fontset_real_get_metrics;
}
PANGO_DEFINE_TYPE_ABSTRACT (PangoFontset, pango_fontset,
pango_fontset_class_init, NULL, G_TYPE_OBJECT);
/**
* pango_fontset_get_font:
* @fontset: a #PangoFontset
* @wc: a unicode character
*
* Returns the font in the fontset that contains the best glyph for the
* unicode character wc.
*
* Returns: a #PangoFont. The caller must call g_object_unref when finished
* with the font.
**/
PangoFont *
pango_fontset_get_font (PangoFontset *fontset,
guint wc)
{
g_return_val_if_fail (PANGO_IS_FONTSET (fontset), NULL);
return PANGO_FONTSET_GET_CLASS (fontset)->get_font (fontset, wc);
}
/**
* pango_fontset_get_metrics:
* @fontset: a #PangoFontset
*
* Get overall metric information for the fonts in the fontset.
*
* Returns: a #PangoMetrics object. The caller must call pango_font_metrics_unref()
* when finished using the object.
**/
PangoFontMetrics *
pango_fontset_get_metrics (PangoFontset *fontset)
{
g_return_val_if_fail (PANGO_IS_FONTSET (fontset), NULL);
return PANGO_FONTSET_GET_CLASS (fontset)->get_metrics (fontset);
}
/**
* pango_fontset_foreach:
* @fontset: a #PangoFontset
* @func: Callback function
* @data: data to pass to the callback function
*
* Iterates through all the fonts in a fontset, calling @func for
* each one. If @func returns %TRUE, that stops the iteration.
*
* Since: 1.4
**/
void
pango_fontset_foreach (PangoFontset *fontset,
PangoFontsetForeachFunc func,
gpointer data)
{
g_return_if_fail (PANGO_IS_FONTSET (fontset));
g_return_if_fail (func != NULL);
PANGO_FONTSET_GET_CLASS (fontset)->foreach (fontset, func, data);
}
static gboolean
get_first_metrics_foreach (PangoFontset *fontset,
PangoFont *font,
gpointer data)
{
PangoFontMetrics *fontset_metrics = data;
PangoLanguage *language = PANGO_FONTSET_GET_CLASS (fontset)->get_language (fontset);
PangoFontMetrics *font_metrics = pango_font_get_metrics (font, language);
guint save_ref_count;
/* Initialize the fontset metrics to metrics of the first font in the
* fontset; saving the refcount and restoring it is a bit of hack but avoids
* having to update this code for each metrics addition.
*/
save_ref_count = fontset_metrics->ref_count;
*fontset_metrics = *font_metrics;
fontset_metrics->ref_count = save_ref_count;
pango_font_metrics_unref (font_metrics);
return TRUE; /* Stops iteration */
}
static PangoFontMetrics *
pango_fontset_real_get_metrics (PangoFontset *fontset)
{
PangoFontMetrics *metrics, *raw_metrics;
const char *sample_str;
const char *p;
int count;
GHashTable *fonts_seen;
PangoFont *font;
PangoLanguage *language;
language = PANGO_FONTSET_GET_CLASS (fontset)->get_language (fontset);
sample_str = pango_language_get_sample_string (language);
count = 0;
metrics = pango_font_metrics_new ();
fonts_seen = g_hash_table_new_full (NULL, NULL, g_object_unref, NULL);
/* Initialize the metrics from the first font in the fontset */
pango_fontset_foreach (fontset, get_first_metrics_foreach, metrics);
p = sample_str;
while (*p)
{
gunichar wc = g_utf8_get_char (p);
font = pango_fontset_get_font (fontset, wc);
if (font)
{
if (g_hash_table_lookup (fonts_seen, font) == NULL)
{
raw_metrics = pango_font_get_metrics (font, language);
g_hash_table_insert (fonts_seen, font, font);
if (count == 0)
{
metrics->ascent = raw_metrics->ascent;
metrics->descent = raw_metrics->descent;
metrics->approximate_char_width = raw_metrics->approximate_char_width;
metrics->approximate_digit_width = raw_metrics->approximate_digit_width;
}
else
{
metrics->ascent = MAX (metrics->ascent, raw_metrics->ascent);
metrics->descent = MAX (metrics->descent, raw_metrics->descent);
metrics->approximate_char_width += raw_metrics->approximate_char_width;
metrics->approximate_digit_width += raw_metrics->approximate_digit_width;
}
count++;
pango_font_metrics_unref (raw_metrics);
}
else
g_object_unref (font);
}
p = g_utf8_next_char (p);
}
g_hash_table_destroy (fonts_seen);
metrics->approximate_char_width /= count;
metrics->approximate_digit_width /= count;
return metrics;
}
/*
* PangoFontsetSimple
*/
#define PANGO_FONTSET_SIMPLE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FONTSET_SIMPLE, PangoFontsetSimpleClass))
#define PANGO_IS_FONTSET_SIMPLE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FONTSET_SIMPLE))
#define PANGO_FONTSET_SIMPLE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FONTSET_SIMPLE, PangoFontsetSimpleClass))
static void pango_fontset_simple_finalize (GObject *object);
static void pango_fontset_simple_init (PangoFontsetSimple *fontset);
static PangoFontMetrics *pango_fontset_simple_get_metrics (PangoFontset *fontset);
static PangoLanguage * pango_fontset_simple_get_language (PangoFontset *fontset);
static PangoFont * pango_fontset_simple_get_font (PangoFontset *fontset,
guint wc);
static void pango_fontset_simple_foreach (PangoFontset *fontset,
PangoFontsetForeachFunc func,
gpointer data);
struct _PangoFontsetSimple
{
PangoFontset parent_instance;
GPtrArray *fonts;
GPtrArray *coverages;
PangoLanguage *language;
};
struct _PangoFontsetSimpleClass
{
PangoFontsetClass parent_class;
};
static PangoFontsetClass *simple_parent_class; /* Parent class structure for PangoFontsetSimple */
/**
* pango_fontset_simple_new:
* @language: a #PangoLanguage tag
*
* Creates a new #PangoFontsetSimple for the given language.
*
* Returns: a newly-allocated #PangoFontsetSimple.
**/
PangoFontsetSimple *
pango_fontset_simple_new (PangoLanguage *language)
{
PangoFontsetSimple *fontset;
fontset = g_object_new (PANGO_TYPE_FONTSET_SIMPLE, NULL);
fontset->language = language;
return fontset;
}
static void
pango_fontset_simple_class_init (PangoFontsetSimpleClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
PangoFontsetClass *fontset_class = PANGO_FONTSET_CLASS (class);
simple_parent_class = g_type_class_peek_parent (class);
object_class->finalize = pango_fontset_simple_finalize;
fontset_class->get_font = pango_fontset_simple_get_font;
fontset_class->get_metrics = pango_fontset_simple_get_metrics;
fontset_class->get_language = pango_fontset_simple_get_language;
fontset_class->foreach = pango_fontset_simple_foreach;
}
static void
pango_fontset_simple_init (PangoFontsetSimple *fontset)
{
fontset->fonts = g_ptr_array_new ();
fontset->coverages = g_ptr_array_new ();
fontset->language = NULL;
}
PANGO_DEFINE_TYPE (PangoFontsetSimple, pango_fontset_simple,
pango_fontset_simple_class_init, pango_fontset_simple_init,
PANGO_TYPE_FONTSET);
static void
pango_fontset_simple_finalize (GObject *object)
{
PangoFontsetSimple *fontset = PANGO_FONTSET_SIMPLE (object);
PangoCoverage *coverage;
int i;
for (i = 0; i < fontset->fonts->len; i++)
g_object_unref (g_ptr_array_index(fontset->fonts, i));
g_ptr_array_free (fontset->fonts, TRUE);
for (i = 0; i < fontset->coverages->len; i++)
{
coverage = g_ptr_array_index (fontset->coverages, i);
if (coverage)
pango_coverage_unref (coverage);
}
g_ptr_array_free (fontset->coverages, TRUE);
G_OBJECT_CLASS (simple_parent_class)->finalize (object);
}
/**
* pango_fontset_simple_append:
* @fontset: a #PangoFontsetSimple.
* @font: a #PangoFont.
*
* Adds a font to the fontset.
**/
void
pango_fontset_simple_append (PangoFontsetSimple *fontset,
PangoFont *font)
{
g_ptr_array_add (fontset->fonts, font);
g_ptr_array_add (fontset->coverages, NULL);
}
/**
* pango_fontset_simple_size:
* @fontset: a #PangoFontsetSimple.
*
* Returns the number of fonts in the fontset.
*
* Returns: the size of @fontset.
**/
int
pango_fontset_simple_size (PangoFontsetSimple *fontset)
{
return fontset->fonts->len;
}
static PangoLanguage *
pango_fontset_simple_get_language (PangoFontset *fontset)
{
PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
return simple->language;
}
static PangoFontMetrics *
pango_fontset_simple_get_metrics (PangoFontset *fontset)
{
PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
if (simple->fonts->len == 1)
return pango_font_get_metrics (PANGO_FONT (g_ptr_array_index(simple->fonts, 0)),
simple->language);
return PANGO_FONTSET_CLASS (simple_parent_class)->get_metrics (fontset);
}
static PangoFont *
pango_fontset_simple_get_font (PangoFontset *fontset,
guint wc)
{
PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
PangoCoverageLevel best_level = PANGO_COVERAGE_NONE;
PangoCoverageLevel level;
PangoFont *font;
PangoCoverage *coverage;
int result = -1;
int i;
for (i = 0; i < simple->fonts->len; i++)
{
coverage = g_ptr_array_index (simple->coverages, i);
if (coverage == NULL)
{
font = g_ptr_array_index (simple->fonts, i);
coverage = pango_font_get_coverage (font, simple->language);
g_ptr_array_index (simple->coverages, i) = coverage;
}
level = pango_coverage_get (coverage, wc);
if (result == -1 || level > best_level)
{
result = i;
best_level = level;
if (level == PANGO_COVERAGE_EXACT)
break;
}
}
font = g_ptr_array_index(simple->fonts, result);
return g_object_ref (font);
}
static void
pango_fontset_simple_foreach (PangoFontset *fontset,
PangoFontsetForeachFunc func,
gpointer data)
{
PangoFontsetSimple *simple = PANGO_FONTSET_SIMPLE (fontset);
int i;
for (i = 0; i < simple->fonts->len; i++)
{
if ((*func) (fontset,
g_ptr_array_index (simple->fonts, i),
data))
return;
}
}
|