summaryrefslogtreecommitdiff
path: root/pango/pangowin32-fontcache.c
blob: b8bc92dc6764f5abe785eea214d6f429e9680446 (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
/* Pango
 * pangowin32-fontcache.c: Cache of HFONTs by LOGFONTW
 *
 * Copyright (C) 2000 Red Hat Software
 * Copyright (C) 2000 Tor Lillqvist
 * Copyright (C) 2007 Novell, Inc.
 *
 * 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 <stdio.h>

#include "pangowin32-private.h"

/* Font cache
 */

/* Number of fonts to retain after they are not otherwise referenced.
 */
#define CACHE_SIZE 16

typedef struct _CacheEntry CacheEntry;

/**
 * PangoWin32FontCache:
 *
 * A #PangoWin32FontCache caches HFONTs by their LOGFONT descriptions.
 */
struct _PangoWin32FontCache
{
  GHashTable *forward;
  GHashTable *back;

  GList *mru;
  GList *mru_tail;
  int mru_count;
};

struct _CacheEntry
{
  LOGFONTW logfontw;
  HFONT hfont;

  gint ref_count;
  GList *mru;
};

static void
free_cache_entry (LOGFONTW            *logfont,
		  CacheEntry          *entry,
		  PangoWin32FontCache *cache)
{
  if (!DeleteObject (entry->hfont))
    PING (("DeleteObject for hfont %p failed", entry->hfont));

  g_slice_free (CacheEntry, entry);
}

/**
 * pango_win32_font_cache_free:
 * @cache: a #PangoWin32FontCache
 *
 * Frees a #PangoWin32FontCache and all associated memory. All fonts loaded
 * through this font cache will be freed along with the cache.
 **/
void
pango_win32_font_cache_free (PangoWin32FontCache *cache)
{
  g_return_if_fail (cache != NULL);

  g_hash_table_foreach (cache->forward, (GHFunc)free_cache_entry, cache);

  g_hash_table_destroy (cache->forward);
  g_hash_table_destroy (cache->back);

  g_list_free (cache->mru);

  g_slice_free (PangoWin32FontCache, cache);
}

static guint
wcs_hash (gconstpointer v)
{
  /* 31 bit hash function */
  const wchar_t *p = v;
  guint32 h = *p;

  if (h)
    for (p += 1; *p != '\0'; p++)
      h = (h << 5) - h + *p;

  return h;
}

static guint
logfontw_hash (gconstpointer v)
{
  const LOGFONTW *lfp = v;

  return wcs_hash (lfp->lfFaceName) +
    (lfp->lfItalic != 0) +
    lfp->lfWeight/10 +
    lfp->lfOrientation +
    abs (lfp->lfHeight) * 10;
}

static gint
logfontw_equal (gconstpointer v1,
		gconstpointer v2)
{
  const LOGFONTW *lfp1 = v1, *lfp2 = v2;

  return (wcscmp (lfp1->lfFaceName, lfp2->lfFaceName) == 0
	  && lfp1->lfPitchAndFamily == lfp2->lfPitchAndFamily
	  && lfp1->lfStrikeOut == lfp2->lfStrikeOut
	  && lfp1->lfUnderline == lfp2->lfUnderline
	  && (lfp1->lfItalic != 0) == (lfp2->lfItalic != 0)
	  && lfp1->lfWeight == lfp2->lfWeight
	  && lfp1->lfOrientation == lfp2->lfOrientation
	  && lfp1->lfEscapement == lfp2->lfEscapement
	  && lfp1->lfWidth == lfp2->lfWidth
	  && lfp1->lfHeight == lfp2->lfHeight);
}

/**
 * pango_win32_font_cache_new:
 *
 * Creates a font cache.
 *
 * Return value: The new font cache. This must be freed with
 * pango_win32_font_cache_free().
 **/
PangoWin32FontCache *
pango_win32_font_cache_new (void)
{
  PangoWin32FontCache *cache;

  cache = g_slice_new (PangoWin32FontCache);

  cache->forward = g_hash_table_new (logfontw_hash, logfontw_equal);
  cache->back = g_hash_table_new (g_direct_hash, g_direct_equal);

  cache->mru = NULL;
  cache->mru_tail = NULL;
  cache->mru_count = 0;

  return cache;
}

static void
cache_entry_unref (PangoWin32FontCache *cache,
		   CacheEntry          *entry)
{
  if (g_atomic_int_dec_and_test (&entry->ref_count))
    {
      PING (("removing cache entry %p", entry->hfont));

      g_hash_table_remove (cache->forward, &entry->logfontw);
      g_hash_table_remove (cache->back, entry->hfont);

      free_cache_entry (NULL, entry, cache);
    }
}

/**
 * pango_win32_font_cache_load:
 * @cache: a #PangoWin32FontCache
 * @logfont: a pointer to a LOGFONTA structure describing the font to load.
 *
 * Creates a HFONT from a LOGFONTA. The
 * result may be newly loaded, or it may have been previously
 * stored
 *
 * Return value: (nullable): The font structure, or %NULL if the font
 * could not be loaded. In order to free this structure, you must call
 * pango_win32_font_cache_unload().
 **/
HFONT
pango_win32_font_cache_load (PangoWin32FontCache *cache,
			     const LOGFONTA      *lfp)
{
  LOGFONTW lf;

  /* We know that the lfFaceName is the last member in the structs */
  *(LOGFONTA *)&lf = *lfp;
  
  if (!MultiByteToWideChar (CP_ACP, MB_ERR_INVALID_CHARS,
			    lfp->lfFaceName, -1,
			    lf.lfFaceName, G_N_ELEMENTS (lf.lfFaceName)))
    return NULL;

  return pango_win32_font_cache_loadw (cache, &lf);
}

/**
 * pango_win32_font_cache_loadw:
 * @cache: a #PangoWin32FontCache
 * @logfont: a pointer to a LOGFONTW structure describing the font to load.
 *
 * Creates a HFONT from a LOGFONTW. The
 * result may be newly loaded, or it may have been previously
 * stored
 *
 * Return value: (nullable): The font structure, or %NULL if the font
 * could not be loaded. In order to free this structure, you must call
 * pango_win32_font_cache_unload().
 *
 * Since: 1.16
 **/
HFONT
pango_win32_font_cache_loadw (PangoWin32FontCache *cache,
			      const LOGFONTW      *lfp)
{
  CacheEntry *entry;
  LOGFONTW lf;
  HFONT hfont;
  int tries;

  g_return_val_if_fail (cache != NULL, NULL);
  g_return_val_if_fail (lfp != NULL, NULL);

  entry = g_hash_table_lookup (cache->forward, lfp);

  if (entry)
    {
      g_atomic_int_inc (&entry->ref_count);
      PING (("increased refcount for cache entry %p: %d", entry->hfont, entry->ref_count));
    }
  else
    {
      BOOL font_smoothing;
      lf = *lfp;
      SystemParametersInfo (SPI_GETFONTSMOOTHING, 0, &font_smoothing, 0);
      /* If on XP or better, try to use ClearType if the global system
       * settings ask for it.
       */
      if (font_smoothing &&
	  (_pango_win32_os_version_info.dwMajorVersion > 5 ||
	   (_pango_win32_os_version_info.dwMajorVersion == 5 &&
	    _pango_win32_os_version_info.dwMinorVersion >= 1)))
	{
	  UINT smoothing_type;

#ifndef SPI_GETFONTSMOOTHINGTYPE
#define SPI_GETFONTSMOOTHINGTYPE 0x200a
#endif
#ifndef FE_FONTSMOOTHINGCLEARTYPE
#define FE_FONTSMOOTHINGCLEARTYPE 2
#endif
#ifndef CLEARTYPE_QUALITY
#define CLEARTYPE_QUALITY 5
#endif
	  SystemParametersInfo (SPI_GETFONTSMOOTHINGTYPE, 0, &smoothing_type, 0);
	  lf.lfQuality =
	    (font_smoothing ?
	     (smoothing_type == FE_FONTSMOOTHINGCLEARTYPE ?
	      CLEARTYPE_QUALITY : ANTIALIASED_QUALITY) :
	     DEFAULT_QUALITY);
	}
      else
	lf.lfQuality = (font_smoothing ? ANTIALIASED_QUALITY : DEFAULT_QUALITY);
      lf.lfCharSet = DEFAULT_CHARSET;
      for (tries = 0; ; tries++)
	{
	  PING (("... trying CreateFontIndirect "
		 "height=%ld,width=%ld,escapement=%ld,orientation=%ld,"
		 "weight=%ld,%s%s%s"
		 "charset=%d,outprecision=%d,clipprecision=%d,"
		 "quality=%d,pitchandfamily=%#.02x,facename=\"%S\")",
		 lf.lfHeight, lf.lfWidth, lf.lfEscapement, lf.lfOrientation,
		 lf.lfWeight, (lf.lfItalic ? "italic," : ""),
		 (lf.lfUnderline ? "underline," : ""),
		 (lf.lfStrikeOut ? "strikeout," : ""),
		 lf.lfCharSet, lf.lfOutPrecision, lf.lfClipPrecision,
		 lf.lfQuality, lf.lfPitchAndFamily, lf.lfFaceName));
	  hfont = CreateFontIndirectW (&lf);

	  if (hfont != NULL)
	    {
	      PING (("Success! hfont=%p", hfont));
	      break;
	    }

	  /* If we fail, try some similar fonts often found on Windows. */
	  if (tries == 0)
	    {
	      gchar *p = g_utf16_to_utf8 (lf.lfFaceName, -1, NULL, NULL, NULL);
	      if (!p)
		; /* Nothing */
	      else if (g_ascii_strcasecmp (p, "helvetica") == 0)
		wcscpy (lf.lfFaceName, L"arial");
	      else if (g_ascii_strcasecmp (p, "new century schoolbook") == 0)
		wcscpy (lf.lfFaceName, L"century schoolbook");
	      else if (g_ascii_strcasecmp (p, "courier") == 0)
		wcscpy (lf.lfFaceName, L"courier new");
	      else if (g_ascii_strcasecmp (p, "lucida") == 0)
		wcscpy (lf.lfFaceName, L"lucida sans unicode");
	      else if (g_ascii_strcasecmp (p, "lucidatypewriter") == 0)
		wcscpy (lf.lfFaceName, L"lucida console");
	      else if (g_ascii_strcasecmp (p, "times") == 0)
		wcscpy (lf.lfFaceName, L"times new roman");
	      g_free (p);
	    }
	  else if (tries == 1)
	    {
	      gchar *p = g_utf16_to_utf8 (lf.lfFaceName, -1, NULL, NULL, NULL);
	      if (!p)
		; /* Nothing */
	      else if (g_ascii_strcasecmp (p, "courier") == 0)
		{
		  wcscpy (lf.lfFaceName, L"");
		  lf.lfPitchAndFamily |= FF_MODERN;
		}
	      else if (g_ascii_strcasecmp (p, "times new roman") == 0)
		{
		  wcscpy (lf.lfFaceName, L"");
		  lf.lfPitchAndFamily |= FF_ROMAN;
		}
	      else if (g_ascii_strcasecmp (p, "helvetica") == 0
		       || g_ascii_strcasecmp (p, "lucida") == 0)
		{
		  wcscpy (lf.lfFaceName, L"");
		  lf.lfPitchAndFamily |= FF_SWISS;
		}
	      else
		{
		  wcscpy (lf.lfFaceName, L"");
		  lf.lfPitchAndFamily = (lf.lfPitchAndFamily & 0x0F) | FF_DONTCARE;
		}
	      g_free (p);
	    }
	  else
	    break;
	  tries++;
	}

      if (!hfont)
	return NULL;

      entry = g_slice_new (CacheEntry);

      entry->logfontw = lf;
      entry->hfont = hfont;

      entry->ref_count = 1;
      entry->mru = NULL;

      g_hash_table_insert (cache->forward, &entry->logfontw, entry);
      g_hash_table_insert (cache->back, entry->hfont, entry);
    }

  if (entry->mru)
    {
      if (cache->mru_count > 1 && entry->mru->prev)
	{
	  /* Move to the head of the mru list */

	  if (entry->mru == cache->mru_tail)
	    {
	      cache->mru_tail = cache->mru_tail->prev;
	      cache->mru_tail->next = NULL;
	    }
	  else
	    {
	      entry->mru->prev->next = entry->mru->next;
	      entry->mru->next->prev = entry->mru->prev;
	    }

	  entry->mru->next = cache->mru;
	  entry->mru->prev = NULL;
	  cache->mru->prev = entry->mru;
	  cache->mru = entry->mru;
	}
    }
  else
    {
      g_atomic_int_inc (&entry->ref_count);

      /* Insert into the mru list */

      if (cache->mru_count == CACHE_SIZE)
	{
	  CacheEntry *old_entry = cache->mru_tail->data;

	  cache->mru_tail = cache->mru_tail->prev;
	  cache->mru_tail->next = NULL;

	  g_list_free_1 (old_entry->mru);
	  old_entry->mru = NULL;
	  cache_entry_unref (cache, old_entry);
	}
      else
	cache->mru_count++;

      cache->mru = g_list_prepend (cache->mru, entry);
      if (!cache->mru_tail)
	cache->mru_tail = cache->mru;
      entry->mru = cache->mru;
    }

  return entry->hfont;
}

/**
 * pango_win32_font_cache_unload:
 * @cache: a #PangoWin32FontCache
 * @hfont: the HFONT to unload
 *
 * Frees a font structure previously loaded with pango_win32_font_cache_load().
 **/
void
pango_win32_font_cache_unload (PangoWin32FontCache *cache,
			       HFONT		    hfont)
{
  CacheEntry *entry;

  g_return_if_fail (cache != NULL);
  g_return_if_fail (hfont != NULL);

  entry = g_hash_table_lookup (cache->back, hfont);
  g_return_if_fail (entry != NULL);

  cache_entry_unref (cache, entry);
}