summaryrefslogtreecommitdiff
path: root/pango/pango-fontmap.c
blob: d4cdefa6f8101fc735159d501eb0cf7d5096063f (plain)
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
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
/* Pango
 * pango-fontmap.c: Font handling
 *
 * 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 <gio/gio.h>

#include "pango-fontmap-private.h"
#include "pango-fontset-private.h"
#include "pango-impl-utils.h"
#include <stdlib.h>

static PangoFontset *pango_font_map_real_load_fontset (PangoFontMap               *fontmap,
						       PangoContext               *context,
						       const PangoFontDescription *desc,
						       PangoLanguage              *language);


static PangoFontFamily *pango_font_map_real_get_family (PangoFontMap *fontmap,
                                                        const char   *name);

static void pango_font_map_real_changed (PangoFontMap *fontmap);

static void pango_font_map_list_model_init (GListModelInterface *iface);

typedef struct {
  guint n_families;
} PangoFontMapPrivate;

G_DEFINE_ABSTRACT_TYPE_WITH_CODE (PangoFontMap, pango_font_map, G_TYPE_OBJECT,
                                  G_ADD_PRIVATE (PangoFontMap)
                                  G_IMPLEMENT_INTERFACE (G_TYPE_LIST_MODEL, pango_font_map_list_model_init))

static void
pango_font_map_class_init (PangoFontMapClass *class)
{
  class->load_fontset = pango_font_map_real_load_fontset;
  class->get_family = pango_font_map_real_get_family;
  class->changed = pango_font_map_real_changed;
}

static void
pango_font_map_init (PangoFontMap *fontmap G_GNUC_UNUSED)
{
}

/**
 * pango_font_map_create_context:
 * @fontmap: a #PangoFontMap
 *
 * Creates a #PangoContext connected to @fontmap.  This is equivalent
 * to pango_context_new() followed by pango_context_set_font_map().
 *
 * If you are using Pango as part of a higher-level system,
 * that system may have it's own way of create a #PangoContext.
 * For instance, the GTK+ toolkit has, among others,
 * gtk_widget_get_pango_context(). Use those instead.
 *
 * Return value: (transfer full): the newly allocated #PangoContext,
 *               which should be freed with g_object_unref().
 *
 * Since: 1.22
 **/
PangoContext *
pango_font_map_create_context (PangoFontMap *fontmap)
{
  PangoContext *context;

  g_return_val_if_fail (fontmap != NULL, NULL);

  context = pango_context_new ();
  pango_context_set_font_map (context, fontmap);

  return context;
}

/**
 * pango_font_map_load_font:
 * @fontmap: a #PangoFontMap
 * @context: the #PangoContext the font will be used with
 * @desc: a #PangoFontDescription describing the font to load
 *
 * Load the font in the fontmap that is the closest match for @desc.
 *
 * Returns: (transfer full) (nullable): the newly allocated #PangoFont
 *          loaded, or %NULL if no font matched.
 **/
PangoFont *
pango_font_map_load_font  (PangoFontMap               *fontmap,
			   PangoContext               *context,
			   const PangoFontDescription *desc)
{
  g_return_val_if_fail (fontmap != NULL, NULL);

  return PANGO_FONT_MAP_GET_CLASS (fontmap)->load_font (fontmap, context, desc);
}

/**
 * pango_font_map_list_families:
 * @fontmap: a #PangoFontMap
 * @families: (out) (array length=n_families) (transfer container): location to store a pointer to an array of #PangoFontFamily *.
 *            This array should be freed with g_free().
 * @n_families: (out): location to store the number of elements in @families
 *
 * List all families for a fontmap.
 **/
void
pango_font_map_list_families (PangoFontMap      *fontmap,
			      PangoFontFamily ***families,
			      int               *n_families)
{
  PangoFontMapPrivate *priv = pango_font_map_get_instance_private (fontmap);
  g_return_if_fail (fontmap != NULL);

  PANGO_FONT_MAP_GET_CLASS (fontmap)->list_families (fontmap, families, n_families);
  
  /* keep this value for GListModel::changed */
  priv->n_families = *n_families;
}

/**
 * pango_font_map_load_fontset:
 * @fontmap: a #PangoFontMap
 * @context: the #PangoContext the font will be used with
 * @desc: a #PangoFontDescription describing the font to load
 * @language: a #PangoLanguage the fonts will be used for
 *
 * Load a set of fonts in the fontmap that can be used to render
 * a font matching @desc.
 *
 * Returns: (transfer full) (nullable): the newly allocated
 *          #PangoFontset loaded, or %NULL if no font matched.
 **/
PangoFontset *
pango_font_map_load_fontset (PangoFontMap                 *fontmap,
			     PangoContext                 *context,
			     const PangoFontDescription   *desc,
			     PangoLanguage                *language)
{
  g_return_val_if_fail (fontmap != NULL, NULL);

  return PANGO_FONT_MAP_GET_CLASS (fontmap)->load_fontset (fontmap, context, desc, language);
}

static void
pango_font_map_fontset_add_fonts (PangoFontMap          *fontmap,
				  PangoContext          *context,
				  PangoFontsetSimple    *fonts,
				  PangoFontDescription  *desc,
				  const char            *family)
{
  PangoFont *font;

  pango_font_description_set_family_static (desc, family);
  font = pango_font_map_load_font (fontmap, context, desc);
  if (font)
    pango_fontset_simple_append (fonts, font);
}

static PangoFontset *
pango_font_map_real_load_fontset (PangoFontMap               *fontmap,
				  PangoContext               *context,
				  const PangoFontDescription *desc,
				  PangoLanguage              *language)
{
  PangoFontDescription *tmp_desc = pango_font_description_copy_static (desc);
  const char *family;
  char **families;
  int i;
  PangoFontsetSimple *fonts;
  static GHashTable *warned_fonts = NULL; /* MT-safe */
  G_LOCK_DEFINE_STATIC (warned_fonts);

  family = pango_font_description_get_family (desc);
  families = g_strsplit (family ? family : "", ",", -1);

  fonts = pango_fontset_simple_new (language);

  for (i = 0; families[i]; i++)
    pango_font_map_fontset_add_fonts (fontmap,
				      context,
				      fonts,
				      tmp_desc,
				      families[i]);

  g_strfreev (families);

  /* The font description was completely unloadable, try with
   * family == "Sans"
   */
  if (pango_fontset_simple_size (fonts) == 0)
    {
      char *ctmp1, *ctmp2;

      pango_font_description_set_family_static (tmp_desc,
						pango_font_description_get_family (desc));

      ctmp1 = pango_font_description_to_string (desc);
      pango_font_description_set_family_static (tmp_desc, "Sans");

      G_LOCK (warned_fonts);
      if (!warned_fonts || !g_hash_table_lookup (warned_fonts, ctmp1))
	{
	  if (!warned_fonts)
	    warned_fonts = g_hash_table_new (g_str_hash, g_str_equal);

	  g_hash_table_insert (warned_fonts, g_strdup (ctmp1), GINT_TO_POINTER (1));

	  ctmp2 = pango_font_description_to_string (tmp_desc);
	  g_warning ("couldn't load font \"%s\", falling back to \"%s\", "
		     "expect ugly output.", ctmp1, ctmp2);
	  g_free (ctmp2);
	}
      G_UNLOCK (warned_fonts);
      g_free (ctmp1);

      pango_font_map_fontset_add_fonts (fontmap,
					context,
					fonts,
					tmp_desc,
					"Sans");
    }

  /* We couldn't try with Sans and the specified style. Try Sans Normal
   */
  if (pango_fontset_simple_size (fonts) == 0)
    {
      char *ctmp1, *ctmp2;

      pango_font_description_set_family_static (tmp_desc, "Sans");
      ctmp1 = pango_font_description_to_string (tmp_desc);
      pango_font_description_set_style (tmp_desc, PANGO_STYLE_NORMAL);
      pango_font_description_set_weight (tmp_desc, PANGO_WEIGHT_NORMAL);
      pango_font_description_set_variant (tmp_desc, PANGO_VARIANT_NORMAL);
      pango_font_description_set_stretch (tmp_desc, PANGO_STRETCH_NORMAL);

      G_LOCK (warned_fonts);
      if (!warned_fonts || !g_hash_table_lookup (warned_fonts, ctmp1))
	{
	  g_hash_table_insert (warned_fonts, g_strdup (ctmp1), GINT_TO_POINTER (1));

	  ctmp2 = pango_font_description_to_string (tmp_desc);

	  g_warning ("couldn't load font \"%s\", falling back to \"%s\", "
		     "expect ugly output.", ctmp1, ctmp2);
	  g_free (ctmp2);
	}
      G_UNLOCK (warned_fonts);
      g_free (ctmp1);

      pango_font_map_fontset_add_fonts (fontmap,
					context,
					fonts,
					tmp_desc,
					"Sans");
    }

  pango_font_description_free (tmp_desc);

  /* Everything failed, we are screwed, there is no way to continue,
   * but lets just not crash here.
   */
  if (pango_fontset_simple_size (fonts) == 0)
      g_warning ("All font fallbacks failed!!!!");

  return PANGO_FONTSET (fonts);
}

/**
 * pango_font_map_get_shape_engine_type:
 * @fontmap: a #PangoFontMap
 *
 * Returns the render ID for shape engines for this fontmap.
 * See the <structfield>render_type</structfield> field of
 * #PangoEngineInfo.
  *
 * Return value: the ID string for shape engines for
 *  this fontmap. Owned by Pango, should not be modified
 *  or freed.
 *
 * Since: 1.4
 * Deprecated: 1.38
 **/
const char *
pango_font_map_get_shape_engine_type (PangoFontMap *fontmap)
{
  g_return_val_if_fail (PANGO_IS_FONT_MAP (fontmap), NULL);

  return PANGO_FONT_MAP_GET_CLASS (fontmap)->shape_engine_type;
}

/**
 * pango_font_map_get_serial:
 * @fontmap: a #PangoFontMap
 *
 * Returns the current serial number of @fontmap.  The serial number is
 * initialized to an small number larger than zero when a new fontmap
 * is created and is increased whenever the fontmap is changed. It may
 * wrap, but will never have the value 0. Since it can wrap, never compare
 * it with "less than", always use "not equals".
 *
 * The fontmap can only be changed using backend-specific API, like changing
 * fontmap resolution.
 *
 * This can be used to automatically detect changes to a #PangoFontMap, like
 * in #PangoContext.
 *
 * Return value: The current serial number of @fontmap.
 *
 * Since: 1.32.4
 **/
guint
pango_font_map_get_serial (PangoFontMap *fontmap)
{
  g_return_val_if_fail (PANGO_IS_FONT_MAP (fontmap), 0);

  if (PANGO_FONT_MAP_GET_CLASS (fontmap)->get_serial)
    return PANGO_FONT_MAP_GET_CLASS (fontmap)->get_serial (fontmap);
  else
    return 1;
}

static void
pango_font_map_real_changed (PangoFontMap *fontmap)
{
  PangoFontMapPrivate *priv = pango_font_map_get_instance_private (fontmap);
  guint removed, added;

  removed = priv->n_families;
  added = g_list_model_get_n_items (G_LIST_MODEL (fontmap));

  g_list_model_items_changed (G_LIST_MODEL (fontmap), 0, removed, added);  
}

/**
 * pango_font_map_changed:
 * @fontmap: a #PangoFontMap
 *
 * Forces a change in the context, which will cause any #PangoContext
 * using this fontmap to change.
 *
 * This function is only useful when implementing a new backend
 * for Pango, something applications won't do. Backends should
 * call this function if they have attached extra data to the context
 * and such data is changed.
 *
 * Since: 1.34
 **/
void
pango_font_map_changed (PangoFontMap *fontmap)
{
  g_return_if_fail (PANGO_IS_FONT_MAP (fontmap));

  if (PANGO_FONT_MAP_GET_CLASS (fontmap)->changed)
    PANGO_FONT_MAP_GET_CLASS (fontmap)->changed (fontmap);
}

static PangoFontFamily *
pango_font_map_real_get_family (PangoFontMap *fontmap,
                                const char   *name)
{
  PangoFontFamily **families;
  int n_families;
  PangoFontFamily *family;
  int i;

  pango_font_map_list_families (fontmap, &families, &n_families);

  family = NULL;

  for (i = 0; i < n_families; i++)
    {
      if (strcmp (name, pango_font_family_get_name (families[i])) == 0)
        {
          family = families[i];
          break;
        }
    }

  g_free (families);

  return family;
}

/**
 * pango_font_map_get_family:
 * @fontmap: a #PangoFontMap
 * @name: a family name
 *
 * Gets a font family by name.
 *
 * Returns: (transfer none): the #PangoFontFamily
 *
 * Since: 1.46
 */
PangoFontFamily *
pango_font_map_get_family (PangoFontMap *fontmap,
                           const char   *name)
{
  g_return_val_if_fail (PANGO_IS_FONT_MAP (fontmap), NULL);

  return PANGO_FONT_MAP_GET_CLASS (fontmap)->get_family (fontmap, name);
}

static GType
pango_font_map_get_item_type (GListModel *list)
{
  return PANGO_TYPE_FONT_FAMILY;
}

static guint
pango_font_map_get_n_items (GListModel *list)
{
  PangoFontMap *fontmap = PANGO_FONT_MAP (list);
  int n_families;

  pango_font_map_list_families (fontmap, NULL, &n_families);

  return (guint)n_families;
}

static gpointer
pango_font_map_get_item (GListModel *list,
                         guint       position)
{
  PangoFontMap *fontmap = PANGO_FONT_MAP (list);
  PangoFontFamily **families;
  int n_families;
  PangoFontFamily *family;

  pango_font_map_list_families (fontmap, &families, &n_families);

  if (position < n_families)
    family = g_object_ref (families[position]);
  else
    family = NULL;

  g_free (families);
  
  return family;
}

static void
pango_font_map_list_model_init (GListModelInterface *iface)
{
  iface->get_item_type = pango_font_map_get_item_type;
  iface->get_n_items = pango_font_map_get_n_items;
  iface->get_item = pango_font_map_get_item;
}