summaryrefslogtreecommitdiff
path: root/pango/pangofc-font.c
blob: d552c48525c482e3271c8cbfa3b997932979570a (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
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
/* Pango
 * pangofc-font.c: Shared interfaces for fontconfig-based backends
 *
 * Copyright (C) 2003 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 "pangofc-font.h"
#include "pangofc-fontmap.h"
#include "pangofc-private.h"
#include "pango-layout.h"
#include "pango-modules.h"
#include "pango-impl-utils.h"

#include <fontconfig/fcfreetype.h>

#include FT_TRUETYPE_TABLES_H

enum {
  PROP_0,
  PROP_PATTERN
};

typedef struct _GUnicharToGlyphCacheEntry GUnicharToGlyphCacheEntry;

/* An entry in the fixed-size cache for the gunichar -> glyph mapping.
 * The cache is indexed by the lower N bits of the gunichar (see
 * GLYPH_CACHE_NUM_ENTRIES).  For scripts with few code points,
 * this should provide pretty much instant lookups.
 *
 * The "ch" field is zero if that cache entry is invalid.
 */
struct _GUnicharToGlyphCacheEntry
{
  gunichar   ch;
  PangoGlyph glyph;
};

typedef struct _PangoFcFontPrivate PangoFcFontPrivate;

struct _PangoFcFontPrivate
{
  PangoFcDecoder *decoder;
  gpointer context_key;
  GUnicharToGlyphCacheEntry *char_to_glyph_cache;
};

#define GLYPH_CACHE_NUM_ENTRIES 256 /* should be power of two */
#define GLYPH_CACHE_MASK (GLYPH_CACHE_NUM_ENTRIES - 1)

static gboolean pango_fc_font_real_has_char  (PangoFcFont *font,
					      gunichar     wc);
static guint    pango_fc_font_real_get_glyph (PangoFcFont *font,
					      gunichar     wc);

static void                  pango_fc_font_finalize     (GObject          *object);
static void                  pango_fc_font_set_property (GObject          *object,
							 guint             prop_id,
							 const GValue     *value,
							 GParamSpec       *pspec);
static PangoEngineShape *    pango_fc_font_find_shaper  (PangoFont        *font,
							 PangoLanguage    *language,
							 guint32           ch);
static PangoCoverage *       pango_fc_font_get_coverage (PangoFont        *font,
							 PangoLanguage    *language);
static PangoFontMetrics *    pango_fc_font_get_metrics  (PangoFont        *font,
							 PangoLanguage    *language);
static PangoFontMap *        pango_fc_font_get_font_map (PangoFont        *font);
static PangoFontDescription *pango_fc_font_describe     (PangoFont        *font);
static PangoFontDescription *pango_fc_font_describe_absolute (PangoFont        *font);


#define PANGO_FC_FONT_LOCK_FACE(font)	(PANGO_FC_FONT_GET_CLASS (font)->lock_face (font))
#define PANGO_FC_FONT_UNLOCK_FACE(font)	(PANGO_FC_FONT_GET_CLASS (font)->unlock_face (font))

G_DEFINE_TYPE (PangoFcFont, pango_fc_font, PANGO_TYPE_FONT)

static void
pango_fc_font_class_init (PangoFcFontClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
  PangoFontClass *font_class = PANGO_FONT_CLASS (class);

  class->has_char = pango_fc_font_real_has_char;
  class->get_glyph = pango_fc_font_real_get_glyph;
  class->get_unknown_glyph = NULL;

  object_class->finalize = pango_fc_font_finalize;
  object_class->set_property = pango_fc_font_set_property;
  font_class->describe = pango_fc_font_describe;
  font_class->describe_absolute = pango_fc_font_describe_absolute;
  font_class->find_shaper = pango_fc_font_find_shaper;
  font_class->get_coverage = pango_fc_font_get_coverage;
  font_class->get_metrics = pango_fc_font_get_metrics;
  font_class->get_font_map = pango_fc_font_get_font_map;

  g_object_class_install_property (object_class, PROP_PATTERN,
				   g_param_spec_pointer ("pattern",
							 "Pattern",
							 "The fontconfig pattern for this font",
							 G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));

  g_type_class_add_private (object_class, sizeof (PangoFcFontPrivate));
}

static void
pango_fc_font_init (PangoFcFont *fcfont)
{
  fcfont->priv = G_TYPE_INSTANCE_GET_PRIVATE (fcfont,
					      PANGO_TYPE_FC_FONT,
					      PangoFcFontPrivate);
}

static void
free_metrics_info (PangoFcMetricsInfo *info)
{
  pango_font_metrics_unref (info->metrics);
  g_slice_free (PangoFcMetricsInfo, info);
}

static void
pango_fc_font_finalize (GObject *object)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (object);
  PangoFcFontPrivate *priv = fcfont->priv;

  g_slist_foreach (fcfont->metrics_by_lang, (GFunc)free_metrics_info, NULL);
  g_slist_free (fcfont->metrics_by_lang);

  if (fcfont->fontmap)
    _pango_fc_font_map_remove (PANGO_FC_FONT_MAP (fcfont->fontmap), fcfont);

  FcPatternDestroy (fcfont->font_pattern);
  pango_font_description_free (fcfont->description);

  if (priv->decoder)
    _pango_fc_font_set_decoder (fcfont, NULL);

  g_free (priv->char_to_glyph_cache);

  G_OBJECT_CLASS (pango_fc_font_parent_class)->finalize (object);
}

static gboolean
pattern_is_hinted (FcPattern *pattern)
{
  FcBool hinting;

  if (FcPatternGetBool (pattern,
			FC_HINTING, 0, &hinting) != FcResultMatch)
    hinting = FcTrue;

  return hinting;
}

static gboolean
pattern_is_transformed (FcPattern *pattern)
{
  FcMatrix *fc_matrix;

  if (FcPatternGetMatrix (pattern, FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
    {
      FT_Matrix ft_matrix;

      ft_matrix.xx = 0x10000L * fc_matrix->xx;
      ft_matrix.yy = 0x10000L * fc_matrix->yy;
      ft_matrix.xy = 0x10000L * fc_matrix->xy;
      ft_matrix.yx = 0x10000L * fc_matrix->yx;

      return ((ft_matrix.xy | ft_matrix.yx) != 0 ||
	      ft_matrix.xx != 0x10000L ||
	      ft_matrix.yy != 0x10000L);
    }
  else
    return FALSE;
}

static void
pango_fc_font_set_property (GObject       *object,
			    guint          prop_id,
			    const GValue  *value,
			    GParamSpec    *pspec)
{
  switch (prop_id)
    {
    case PROP_PATTERN:
      {
	PangoFcFont *fcfont = PANGO_FC_FONT (object);
	FcPattern *pattern = g_value_get_pointer (value);

	g_return_if_fail (pattern != NULL);
	g_return_if_fail (fcfont->font_pattern == NULL);

	FcPatternReference (pattern);
	fcfont->font_pattern = pattern;
	fcfont->description = pango_fc_font_description_from_pattern (pattern, TRUE);
	fcfont->is_hinted = pattern_is_hinted (pattern);
	fcfont->is_transformed = pattern_is_transformed (pattern);
      }
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static PangoFontDescription *
pango_fc_font_describe (PangoFont *font)
{
  PangoFcFont *fcfont = (PangoFcFont *)font;

  return pango_font_description_copy (fcfont->description);
}

static PangoFontDescription *
pango_fc_font_describe_absolute (PangoFont *font)
{
  PangoFcFont *fcfont = (PangoFcFont *)font;
  PangoFontDescription *desc = pango_font_description_copy (fcfont->description);
  double size;

  if (FcPatternGetDouble (fcfont->font_pattern, FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
    pango_font_description_set_absolute_size (desc, size * PANGO_SCALE);

  return desc;
}

static PangoMap *
pango_fc_get_shaper_map (PangoLanguage *language)
{
  static guint engine_type_id = 0;
  static guint render_type_id = 0;

  if (engine_type_id == 0)
    {
      engine_type_id = g_quark_from_static_string (PANGO_ENGINE_TYPE_SHAPE);
      render_type_id = g_quark_from_static_string (PANGO_RENDER_TYPE_FC);
    }

  return pango_find_map (language, engine_type_id, render_type_id);
}

static PangoEngineShape *
pango_fc_font_find_shaper (PangoFont     *font,
			   PangoLanguage *language,
			   guint32        ch)
{
  PangoMap *shaper_map = NULL;
  PangoScript script;

  shaper_map = pango_fc_get_shaper_map (language);
  script = pango_script_for_unichar (ch);
  return (PangoEngineShape *)pango_map_get_engine (shaper_map, script);
}

static PangoCoverage *
pango_fc_font_get_coverage (PangoFont     *font,
			    PangoLanguage *language)
{
  PangoFcFont *fcfont = (PangoFcFont *)font;
  PangoFcFontPrivate *priv = fcfont->priv;
  FcCharSet *charset;

  if (priv->decoder)
    {
      charset = pango_fc_decoder_get_charset (priv->decoder, fcfont);
      return _pango_fc_font_map_fc_to_coverage (charset);
    }

  return _pango_fc_font_map_get_coverage (PANGO_FC_FONT_MAP (fcfont->fontmap),
					  fcfont);
}

/* For Xft, it would be slightly more efficient to simply to
 * call Xft, and also more robust against changes in Xft.
 * But for now, we simply use the same code for all backends.
 *
 * The code in this function is partly based on code from Xft,
 * Copyright 2000 Keith Packard
 */
static void
get_face_metrics (PangoFcFont      *fcfont,
		  PangoFontMetrics *metrics)
{
  FT_Face face = PANGO_FC_FONT_LOCK_FACE (fcfont);
  FcMatrix *fc_matrix;
  FT_Matrix ft_matrix;
  TT_OS2 *os2;
  gboolean have_transform = FALSE;

  if (!face)
    {
      metrics->descent = 0;
      metrics->ascent = PANGO_SCALE * PANGO_UNKNOWN_GLYPH_HEIGHT;
      metrics->underline_thickness = PANGO_SCALE;
      metrics->underline_position = - PANGO_SCALE;
      metrics->strikethrough_thickness = PANGO_SCALE;
      metrics->strikethrough_position = PANGO_SCALE * (PANGO_UNKNOWN_GLYPH_HEIGHT/2);
      return;
    }

  if  (FcPatternGetMatrix (fcfont->font_pattern,
			   FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
    {
      ft_matrix.xx = 0x10000L * fc_matrix->xx;
      ft_matrix.yy = 0x10000L * fc_matrix->yy;
      ft_matrix.xy = 0x10000L * fc_matrix->xy;
      ft_matrix.yx = 0x10000L * fc_matrix->yx;

      have_transform = (ft_matrix.xx != 0x10000 || ft_matrix.xy != 0 ||
			ft_matrix.yx != 0 || ft_matrix.yy != 0x10000);
    }

  if (have_transform)
    {
      FT_Vector	vector;

      vector.x = 0;
      vector.y = face->size->metrics.descender;
      FT_Vector_Transform (&vector, &ft_matrix);
      metrics->descent = - PANGO_UNITS_26_6 (vector.y);

      vector.x = 0;
      vector.y = face->size->metrics.ascender;
      FT_Vector_Transform (&vector, &ft_matrix);
      metrics->ascent = PANGO_UNITS_26_6 (vector.y);
    }
  else if (fcfont->is_hinted ||
	   (face->face_flags & FT_FACE_FLAG_SCALABLE) == 0)
    {
      metrics->descent = - PANGO_UNITS_26_6 (face->size->metrics.descender);
      metrics->ascent = PANGO_UNITS_26_6 (face->size->metrics.ascender);
    }
  else
    {
      FT_Fixed ascender, descender;

      descender = FT_MulFix (face->descender, face->size->metrics.y_scale);
      metrics->descent = - PANGO_UNITS_26_6 (descender);

      ascender = FT_MulFix (face->ascender, face->size->metrics.y_scale);
      metrics->ascent = PANGO_UNITS_26_6 (ascender);
    }

  /* Versions of FreeType < 2.1.8 get underline thickness wrong
   * for Postscript fonts (always zero), so we need a fallback
   */
  if (face->underline_thickness == 0)
    {
      metrics->underline_thickness = (PANGO_SCALE * face->size->metrics.y_ppem) / 14;
      metrics->underline_position = - metrics->underline_thickness;
    }
  else
    {
      FT_Fixed ft_thickness, ft_position;

      ft_thickness = FT_MulFix (face->underline_thickness, face->size->metrics.y_scale);
      metrics->underline_thickness = PANGO_UNITS_26_6 (ft_thickness);

      ft_position = FT_MulFix (face->underline_position, face->size->metrics.y_scale);
      metrics->underline_position = PANGO_UNITS_26_6 (ft_position);
    }

  os2 = FT_Get_Sfnt_Table (face, ft_sfnt_os2);
  if (os2 && os2->version != 0xFFFF && os2->yStrikeoutSize != 0)
    {
      FT_Fixed ft_thickness, ft_position;

      ft_thickness = FT_MulFix (os2->yStrikeoutSize, face->size->metrics.y_scale);
      metrics->strikethrough_thickness = PANGO_UNITS_26_6 (ft_thickness);

      ft_position = FT_MulFix (os2->yStrikeoutPosition, face->size->metrics.y_scale);
      metrics->strikethrough_position = PANGO_UNITS_26_6 (ft_position);
    }
  else
    {
      metrics->strikethrough_thickness = metrics->underline_thickness;
      metrics->strikethrough_position = (PANGO_SCALE * face->size->metrics.y_ppem) / 4;
    }

  /* If hinting is on for this font, quantize the underline and strikethrough position
   * to integer values.
   */
  if (fcfont->is_hinted)
    {
      pango_quantize_line_geometry (&metrics->underline_thickness,
				    &metrics->underline_position);
      pango_quantize_line_geometry (&metrics->strikethrough_thickness,
				    &metrics->strikethrough_position);
    }

  PANGO_FC_FONT_UNLOCK_FACE (fcfont);
}

static int
max_glyph_width (PangoLayout *layout)
{
  int max_width = 0;
  GSList *l, *r;

  for (l = pango_layout_get_lines_readonly (layout); l; l = l->next)
    {
      PangoLayoutLine *line = l->data;

      for (r = line->runs; r; r = r->next)
        {
          PangoGlyphString *glyphs = ((PangoGlyphItem *)r->data)->glyphs;
          int i;

          for (i = 0; i < glyphs->num_glyphs; i++)
            if (glyphs->glyphs[i].geometry.width > max_width)
              max_width = glyphs->glyphs[i].geometry.width;
        }
    }

  return max_width;
}

PangoFontMetrics *
pango_fc_font_create_metrics_for_context (PangoFcFont   *fcfont,
					  PangoContext  *context)
{
  PangoFontMetrics *metrics;
  PangoLayout *layout;
  PangoRectangle extents;
  PangoLanguage *language = pango_context_get_language (context);
  const char *sample_str = pango_language_get_sample_string (language);
  PangoFontDescription *desc = pango_font_describe_with_absolute_size (fcfont);

  metrics = pango_font_metrics_new ();

  get_face_metrics (fcfont, metrics);

  layout = pango_layout_new (context);
  pango_layout_set_font_description (layout, desc);
  pango_font_description_free (desc);

  pango_layout_set_text (layout, sample_str, -1);
  pango_layout_get_extents (layout, NULL, &extents);

  metrics->approximate_char_width =
    extents.width / g_utf8_strlen (sample_str, -1);

  pango_layout_set_text (layout, "0123456789", -1);
  metrics->approximate_digit_width = max_glyph_width (layout);

  g_object_unref (layout);

  return metrics;
}

/* This function is cut-and-pasted into pangocairo-fcfont.c - it might be
 * better to add a virtual fcfont->create_context (font).
 */
static PangoFontMetrics *
pango_fc_font_get_metrics (PangoFont     *font,
                           PangoLanguage *language)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (font);
  PangoFcMetricsInfo *info = NULL; /* Quiet gcc */
  GSList *tmp_list;

  const char *sample_str = pango_language_get_sample_string (language);

  tmp_list = fcfont->metrics_by_lang;
  while (tmp_list)
    {
      info = tmp_list->data;

      if (info->sample_str == sample_str)    /* We _don't_ need strcmp */
	break;

      tmp_list = tmp_list->next;
    }

  if (!tmp_list)
    {
      PangoContext *context;

      if (!fcfont->fontmap)
	return pango_font_metrics_new ();

      info = g_slice_new0 (PangoFcMetricsInfo);

      fcfont->metrics_by_lang = g_slist_prepend (fcfont->metrics_by_lang,
						 info);

      info->sample_str = sample_str;

      context = pango_fc_font_map_create_context (PANGO_FC_FONT_MAP (fcfont->fontmap));
      pango_context_set_language (context, language);

      info->metrics = pango_fc_font_create_metrics_for_context (fcfont, context);

      g_object_unref (context);
    }

  return pango_font_metrics_ref (info->metrics);
}

static PangoFontMap *
pango_fc_font_get_font_map (PangoFont *font)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (font);

  return fcfont->fontmap;
}

static gboolean
pango_fc_font_real_has_char (PangoFcFont *font,
			     gunichar     wc)
{
  FcCharSet *charset;

  if (FcPatternGetCharSet (font->font_pattern,
                           FC_CHARSET, 0, &charset) != FcResultMatch)
    return FALSE;

  return FcCharSetHasChar (charset, wc);
}

static guint
pango_fc_font_real_get_glyph (PangoFcFont *font,
			      gunichar     wc)
{
  FT_Face face;
  FT_UInt index;

  guint idx;
  GUnicharToGlyphCacheEntry *entry;

  PangoFcFontPrivate *priv = font->priv;

  if (G_UNLIKELY (priv->char_to_glyph_cache == NULL))
    {
      priv->char_to_glyph_cache = g_new0 (GUnicharToGlyphCacheEntry, GLYPH_CACHE_NUM_ENTRIES);
      /* Make sure all cache entries are invalid initially */
      priv->char_to_glyph_cache[0].ch = 1; /* char 1 cannot happen in bucket 0 */
    }

  idx = wc & GLYPH_CACHE_MASK;
  entry = priv->char_to_glyph_cache + idx;

  if (entry->ch != wc)
    {
      face = PANGO_FC_FONT_LOCK_FACE (font);
      index = FcFreeTypeCharIndex (face, wc);
      if (index > (FT_UInt)face->num_glyphs)
        index = 0;

      entry->ch = wc;
      entry->glyph = index;

      PANGO_FC_FONT_UNLOCK_FACE (font);
    }

  return entry->glyph;
}

/**
 * pango_fc_font_lock_face:
 * @font: a #PangoFcFont.
 *
 * Gets the FreeType <type>FT_Face</type> associated with a font,
 * This face will be kept around until you call
 * pango_fc_font_unlock_face().
 *
 * Return value: the FreeType <type>FT_Face</type> associated with @font.
 *
 * Since: 1.4
 **/
FT_Face
pango_fc_font_lock_face (PangoFcFont *font)
{
  g_return_val_if_fail (PANGO_IS_FC_FONT (font), NULL);

  return PANGO_FC_FONT_LOCK_FACE (font);
}

/**
 * pango_fc_font_unlock_face:
 * @font: a #PangoFcFont.
 *
 * Releases a font previously obtained with
 * pango_fc_font_lock_face().
 *
 * Since: 1.4
 **/
void
pango_fc_font_unlock_face (PangoFcFont *font)
{
  g_return_if_fail (PANGO_IS_FC_FONT (font));

  PANGO_FC_FONT_UNLOCK_FACE (font);
}

/**
 * pango_fc_font_has_char:
 * @font: a #PangoFcFont
 * @wc: Unicode codepoint to look up
 *
 * Determines whether @font has a glyph for the codepoint @wc.
 *
 * Return value: %TRUE if @font has the requested codepoint.
 *
 * Since: 1.4
 **/
gboolean
pango_fc_font_has_char (PangoFcFont *font,
			gunichar     wc)
{
  PangoFcFontPrivate *priv = font->priv;
  FcCharSet *charset;

  g_return_val_if_fail (PANGO_IS_FC_FONT (font), FALSE);

  if (priv->decoder)
    {
      charset = pango_fc_decoder_get_charset (priv->decoder, font);
      return FcCharSetHasChar (charset, wc);
    }

  return PANGO_FC_FONT_GET_CLASS (font)->has_char (font, wc);
}

/**
 * pango_fc_font_get_glyph:
 * @font: a #PangoFcFont
 * @wc: Unicode character to look up
 *
 * Gets the glyph index for a given Unicode character
 * for @font. If you only want to determine
 * whether the font has the glyph, use pango_fc_font_has_char().
 *
 * Return value: the glyph index, or 0, if the Unicode
 *   character doesn't exist in the font.
 *
 * Since: 1.4
 **/
PangoGlyph
pango_fc_font_get_glyph (PangoFcFont *font,
			 gunichar     wc)
{
  PangoFcFontPrivate *priv = font->priv;

  /* Replace NBSP with a normal space; it should be invariant that
   * they shape the same other than breaking properties.
   */
  if (wc == 0xA0)
	  wc = 0x20;

  if (priv->decoder)
    return pango_fc_decoder_get_glyph (priv->decoder, font, wc);

  return PANGO_FC_FONT_GET_CLASS (font)->get_glyph (font, wc);
}


/**
 * pango_fc_font_get_unknown_glyph:
 * @font: a #PangoFcFont
 * @wc: the Unicode character for which a glyph is needed.
 *
 * Returns the index of a glyph suitable for drawing @wc as an
 * unknown character.
 *
 * Use PANGO_GET_UNKNOWN_GLYPH() instead.
 *
 * Return value: a glyph index into @font.
 *
 * Since: 1.4
 **/
PangoGlyph
pango_fc_font_get_unknown_glyph (PangoFcFont *font,
				 gunichar     wc)
{
  if (font && PANGO_FC_FONT_GET_CLASS (font)->get_unknown_glyph)
    return PANGO_FC_FONT_GET_CLASS (font)->get_unknown_glyph (font, wc);

  return PANGO_GET_UNKNOWN_GLYPH (wc);
}

void
_pango_fc_font_shutdown (PangoFcFont *font)
{
  g_return_if_fail (PANGO_IS_FC_FONT (font));

  if (PANGO_FC_FONT_GET_CLASS (font)->shutdown)
    PANGO_FC_FONT_GET_CLASS (font)->shutdown (font);
}

/**
 * pango_fc_font_kern_glyphs
 * @font: a #PangoFcFont
 * @glyphs: a #PangoGlyphString
 *
 * Adjust each adjacent pair of glyphs in @glyphs according to
 * kerning information in @font.
 *
 * Since: 1.4
 **/
void
pango_fc_font_kern_glyphs (PangoFcFont      *font,
			   PangoGlyphString *glyphs)
{
  FT_Face face;
  FT_Error error;
  FT_Vector kerning;
  int i;

  g_return_if_fail (PANGO_IS_FC_FONT (font));
  g_return_if_fail (glyphs != NULL);

  face = PANGO_FC_FONT_LOCK_FACE (font);
  if (!face)
    return;

  if (!FT_HAS_KERNING (face))
    {
      PANGO_FC_FONT_UNLOCK_FACE (font);
      return;
    }

  for (i = 1; i < glyphs->num_glyphs; ++i)
    {
      error = FT_Get_Kerning (face,
			      glyphs->glyphs[i-1].glyph,
			      glyphs->glyphs[i].glyph,
			      ft_kerning_default,
			      &kerning);

      if (error == FT_Err_Ok)
	glyphs->glyphs[i-1].geometry.width += PANGO_UNITS_26_6 (kerning.x);
    }

  PANGO_FC_FONT_UNLOCK_FACE (font);
}

/**
 * _pango_fc_font_get_decoder
 * @font: a #PangoFcFont
 *
 * This will return any custom decoder set on this font.
 *
 * Return value: The custom decoder
 *
 * Since: 1.6
 **/

PangoFcDecoder *
_pango_fc_font_get_decoder (PangoFcFont *font)
{
  PangoFcFontPrivate *priv = font->priv;

  return priv->decoder;
}

/**
 * _pango_fc_font_set_decoder
 * @font: a #PangoFcFont
 * @decoder: a #PangoFcDecoder to set for this font
 *
 * This sets a custom decoder for this font.  Any previous decoder
 * will be released before this one is set.
 *
 * Since: 1.6
 **/

void
_pango_fc_font_set_decoder (PangoFcFont    *font,
			    PangoFcDecoder *decoder)
{
  PangoFcFontPrivate *priv = font->priv;

  if (priv->decoder)
    g_object_unref (priv->decoder);

  priv->decoder = decoder;

  if (priv->decoder)
    g_object_ref (priv->decoder);
}

gpointer
_pango_fc_font_get_context_key (PangoFcFont *fcfont)
{
  PangoFcFontPrivate *priv = fcfont->priv;

  return priv->context_key;
}

void
_pango_fc_font_set_context_key (PangoFcFont *fcfont,
				gpointer     context_key)
{
  PangoFcFontPrivate *priv = fcfont->priv;

  priv->context_key = context_key;
}

static FT_Glyph_Metrics *
get_per_char (FT_Face      face,
	      FT_Int32     load_flags,
	      PangoGlyph   glyph)
{
  FT_Error error;
  FT_Glyph_Metrics *result;

  error = FT_Load_Glyph (face, glyph, load_flags);
  if (error == FT_Err_Ok)
    result = &face->glyph->metrics;
  else
    result = NULL;

  return result;
}

/**
 * pango_fc_font_get_raw_extents:
 * @fcfont: a #PangoFcFont
 * @load_flags: flags to pass to FT_Load_Glyph()
 * @glyph: the glyph index to load
 * @ink_rect: location to store ink extents of the glyph, or %NULL
 * @logical_rect: location to store logical extents of the glyph or %NULL
 *
 * Gets the extents of a single glyph from a font. The extents are in
 * user space; that is, they are not transformed by any matrix in effect
 * for the font.
 *
 * Long term, this functionality probably belongs in the default
 * implementation of the get_glyph_extents() virtual function.
 * The other possibility would be to to make it public in something
 * like it's current form, and also expose glyph information
 * caching functionality similar to pango_ft2_font_set_glyph_info().
 *
 * Since: 1.6
 **/
void
pango_fc_font_get_raw_extents (PangoFcFont    *fcfont,
			       FT_Int32        load_flags,
			       PangoGlyph      glyph,
			       PangoRectangle *ink_rect,
			       PangoRectangle *logical_rect)
{
  FT_Glyph_Metrics *gm;
  FT_Face face;

  g_return_if_fail (PANGO_IS_FC_FONT (fcfont));

  face = PANGO_FC_FONT_LOCK_FACE (fcfont);

  if (glyph == PANGO_GLYPH_EMPTY)
    gm = NULL;
  else
    gm = get_per_char (face, load_flags, glyph);

  if (gm)
    {
      if (ink_rect)
	{
	  ink_rect->x = PANGO_UNITS_26_6 (gm->horiBearingX);
	  ink_rect->width = PANGO_UNITS_26_6 (gm->width);
	  ink_rect->y = -PANGO_UNITS_26_6 (gm->horiBearingY);
	  ink_rect->height = PANGO_UNITS_26_6 (gm->height);
	}

      if (logical_rect)
	{
	  logical_rect->x = 0;
	  logical_rect->width = PANGO_UNITS_26_6 (gm->horiAdvance);
	  if (fcfont->is_hinted ||
	      (face->face_flags & FT_FACE_FLAG_SCALABLE) == 0)
	    {
	      logical_rect->y = - PANGO_UNITS_26_6 (face->size->metrics.ascender);
	      logical_rect->height = PANGO_UNITS_26_6 (face->size->metrics.ascender - face->size->metrics.descender);
	    }
	  else
	    {
	      FT_Fixed ascender, descender;

	      ascender = FT_MulFix (face->ascender, face->size->metrics.y_scale);
	      descender = FT_MulFix (face->descender, face->size->metrics.y_scale);

	      logical_rect->y = - PANGO_UNITS_26_6 (ascender);
	      logical_rect->height = PANGO_UNITS_26_6 (ascender - descender);
	    }
	}
    }
  else
    {
      if (ink_rect)
	{
	  ink_rect->x = 0;
	  ink_rect->width = 0;
	  ink_rect->y = 0;
	  ink_rect->height = 0;
	}

      if (logical_rect)
	{
	  logical_rect->x = 0;
	  logical_rect->width = 0;
	  logical_rect->y = 0;
	  logical_rect->height = 0;
	}
    }

  PANGO_FC_FONT_UNLOCK_FACE (fcfont);
}