summaryrefslogtreecommitdiff
path: root/pango/pangoft2.c
blob: 5430c3233cf32745664b6f3d11aa4b4ad45e9b35 (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
/* Pango
 * pangoft2.c: Routines for handling FreeType2 fonts
 *
 * Copyright (C) 1999 Red Hat Software
 * Copyright (C) 2000 Tor Lillqvist
 *
 * 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 <string.h>
#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include <glib/gprintf.h>

#include "pangoft2.h"
#include "pangoft2-private.h"
#include "pangofc-fontmap.h"
#include "pangofc-private.h"

PangoFT2WarningHistory _pango_ft2_warning_history = { FALSE };

/* for compatibility with older freetype versions */
#ifndef FT_LOAD_TARGET_MONO
#define FT_LOAD_TARGET_MONO  FT_LOAD_MONOCHROME
#endif

#define PANGO_FT2_FONT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FT2_FONT, PangoFT2FontClass))
#define PANGO_FT2_IS_FONT_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FT2_FONT))
#define PANGO_FT2_FONT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FT2_FONT, PangoFT2FontClass))

typedef struct _PangoFT2FontClass   PangoFT2FontClass;

struct _PangoFT2FontClass
{
  PangoFcFontClass parent_class;
};

static void pango_ft2_font_finalize   (GObject         *object);

static void                   pango_ft2_font_get_glyph_extents (PangoFont      *font,
								PangoGlyph      glyph,
								PangoRectangle *ink_rect,
								PangoRectangle *logical_rect);

static FT_Face    pango_ft2_font_real_lock_face         (PangoFcFont      *font);
static void       pango_ft2_font_real_unlock_face       (PangoFcFont      *font);

PangoFT2Font *
_pango_ft2_font_new (PangoFT2FontMap *ft2fontmap,
		     FcPattern       *pattern)
{
  PangoFontMap *fontmap = PANGO_FONT_MAP (ft2fontmap);
  PangoFT2Font *ft2font;
  double d;

  g_return_val_if_fail (fontmap != NULL, NULL);
  g_return_val_if_fail (pattern != NULL, NULL);

  ft2font = (PangoFT2Font *)g_object_new (PANGO_TYPE_FT2_FONT,
					  "pattern", pattern,
					  NULL);

  if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &d) == FcResultMatch)
    ft2font->size = d*PANGO_SCALE;

  return ft2font;
}

static void
load_fallback_face (PangoFT2Font *ft2font,
		    const char   *original_file)
{
  PangoFcFont *fcfont = PANGO_FC_FONT (ft2font);
  FcPattern *sans;
  FcPattern *matched;
  FcResult result;
  FT_Error error;
  FcChar8 *filename2 = NULL;
  gchar *name;
  int id;

  sans = FcPatternBuild (NULL,
			 FC_FAMILY,     FcTypeString, "sans",
			 FC_PIXEL_SIZE, FcTypeDouble, (double)ft2font->size / PANGO_SCALE,
			 NULL);

  _pango_ft2_font_map_default_substitute (fcfont->fontmap, sans);

  matched = FcFontMatch (NULL, sans, &result);

  if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
    goto bail1;

  if (FcPatternGetInteger (matched, FC_INDEX, 0, &id) != FcResultMatch)
    goto bail1;

  error = FT_New_Face (_pango_ft2_font_map_get_library (fcfont->fontmap),
		       (char *) filename2, id, &ft2font->face);


  if (error)
    {
    bail1:
      name = pango_font_description_to_string (fcfont->description);
      g_warning ("Unable to open font file %s for font %s, exiting\n", filename2, name);
      exit (1);
    }
  else
    {
      name = pango_font_description_to_string (fcfont->description);
      g_warning ("Unable to open font file %s for font %s, falling back to %s\n", original_file, name, filename2);
      g_free (name);
    }

  FcPatternDestroy (sans);
  FcPatternDestroy (matched);
}

static void
set_transform (PangoFT2Font *ft2font)
{
  PangoFcFont *fcfont = (PangoFcFont *)ft2font;
  FcMatrix *fc_matrix;

  if (FcPatternGetMatrix (fcfont->font_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;

      FT_Set_Transform (ft2font->face, &ft_matrix, NULL);
    }
}

/**
 * pango_ft2_font_get_face:
 * @font: a #PangoFont
 *
 * Returns the native FreeType2 <type>FT_Face</type> structure used for this #PangoFont.
 * This may be useful if you want to use FreeType2 functions directly.
 *
 * Use pango_fc_font_lock_face() instead; when you are done with a
 * face from pango_fc_font_lock_face() you must call
 * pango_fc_font_unlock_face().
 *
 * Return value: a pointer to a <type>FT_Face</type> structure, with the size set correctly
 **/
FT_Face
pango_ft2_font_get_face (PangoFont *font)
{
  PangoFT2Font *ft2font = (PangoFT2Font *)font;
  PangoFcFont *fcfont = (PangoFcFont *)font;
  FT_Error error;
  FcPattern *pattern;
  FcChar8 *filename;
  FcBool antialias, hinting, autohint;
  int id;

  if (G_UNLIKELY (!PANGO_FT2_IS_FONT (font)))
    {
      if (!_pango_ft2_warning_history.get_face)
	{
	  _pango_ft2_warning_history.get_face = TRUE;
	  g_warning ("pango_ft2_font_get_face called with bad font, expect ugly output");
	}
      return NULL;
    }

  pattern = fcfont->font_pattern;

  if (!ft2font->face)
    {
      ft2font->load_flags = 0;

      /* disable antialiasing if requested */
      if (FcPatternGetBool (pattern,
			    FC_ANTIALIAS, 0, &antialias) != FcResultMatch)
	antialias = FcTrue;

      if (antialias)
	ft2font->load_flags |= FT_LOAD_NO_BITMAP;
      else
	ft2font->load_flags |= FT_LOAD_TARGET_MONO;

      /* disable hinting if requested */
      if (FcPatternGetBool (pattern,
			    FC_HINTING, 0, &hinting) != FcResultMatch)
	hinting = FcTrue;

      if (!hinting)
	ft2font->load_flags |= FT_LOAD_NO_HINTING;

      /* force autohinting if requested */
      if (FcPatternGetBool (pattern,
			    FC_AUTOHINT, 0, &autohint) != FcResultMatch)
	autohint = FcFalse;

      if (autohint)
	ft2font->load_flags |= FT_LOAD_FORCE_AUTOHINT;

      if (FcPatternGetString (pattern, FC_FILE, 0, &filename) != FcResultMatch)
	      goto bail0;

      if (FcPatternGetInteger (pattern, FC_INDEX, 0, &id) != FcResultMatch)
	      goto bail0;

      error = FT_New_Face (_pango_ft2_font_map_get_library (fcfont->fontmap),
			   (char *) filename, id, &ft2font->face);
      if (error != FT_Err_Ok)
	{
	bail0:
	  load_fallback_face (ft2font, filename);
	}

      g_assert (ft2font->face);

      set_transform (ft2font);

      error = FT_Set_Char_Size (ft2font->face,
				PANGO_PIXELS_26_6 (ft2font->size),
				PANGO_PIXELS_26_6 (ft2font->size),
				0, 0);
      if (error)
	g_warning ("Error in FT_Set_Char_Size: %d", error);
    }

  return ft2font->face;
}

G_DEFINE_TYPE (PangoFT2Font, pango_ft2_font, PANGO_TYPE_FC_FONT)

static void
pango_ft2_font_init (PangoFT2Font *ft2font)
{
  ft2font->face = NULL;

  ft2font->size = 0;

  ft2font->glyph_info = g_hash_table_new (NULL, NULL);
}

static void
pango_ft2_font_class_init (PangoFT2FontClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);
  PangoFontClass *font_class = PANGO_FONT_CLASS (class);
  PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (class);

  object_class->finalize = pango_ft2_font_finalize;

  font_class->get_glyph_extents = pango_ft2_font_get_glyph_extents;

  fc_font_class->lock_face = pango_ft2_font_real_lock_face;
  fc_font_class->unlock_face = pango_ft2_font_real_unlock_face;
}

static PangoFT2GlyphInfo *
pango_ft2_font_get_glyph_info (PangoFont   *font,
			       PangoGlyph   glyph,
			       gboolean     create)
{
  PangoFT2Font *ft2font = (PangoFT2Font *)font;
  PangoFcFont *fcfont = (PangoFcFont *)font;
  PangoFT2GlyphInfo *info;

  info = g_hash_table_lookup (ft2font->glyph_info, GUINT_TO_POINTER (glyph));

  if ((info == NULL) && create)
    {
      info = g_slice_new0 (PangoFT2GlyphInfo);

      pango_fc_font_get_raw_extents (fcfont, ft2font->load_flags,
				     glyph,
				     &info->ink_rect,
				     &info->logical_rect);

      g_hash_table_insert (ft2font->glyph_info, GUINT_TO_POINTER(glyph), info);
    }

  return info;
}

static void
pango_ft2_font_get_glyph_extents (PangoFont      *font,
				  PangoGlyph      glyph,
				  PangoRectangle *ink_rect,
				  PangoRectangle *logical_rect)
{
  PangoFT2GlyphInfo *info;

  if (glyph == PANGO_GLYPH_EMPTY)
    {
      if (ink_rect)
	ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
      if (logical_rect)
	logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
      return;
    }

  if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
    {
      glyph = pango_ft2_get_unknown_glyph (font);
      if (glyph == PANGO_GLYPH_EMPTY)
	{
	  /* No unknown glyph found for the font, draw a box */
	  PangoFontMetrics *metrics = pango_font_get_metrics (font, NULL);

	  if (metrics)
	    {
	      if (ink_rect)
		{
		  ink_rect->x = PANGO_SCALE;
		  ink_rect->width = metrics->approximate_char_width - 2 * PANGO_SCALE;
		  ink_rect->y = - (metrics->ascent - PANGO_SCALE);
		  ink_rect->height = metrics->ascent + metrics->descent - 2 * PANGO_SCALE;
		}
	      if (logical_rect)
		{
		  logical_rect->x = 0;
		  logical_rect->width = metrics->approximate_char_width;
		  logical_rect->y = -metrics->ascent;
		  logical_rect->height = metrics->ascent + metrics->descent;
		}

	      pango_font_metrics_unref (metrics);
	    }
	  else
	    {
	      if (ink_rect)
		ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
	      if (logical_rect)
		logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
	    }
	  return;
	}
    }

  info = pango_ft2_font_get_glyph_info (font, glyph, TRUE);

  if (ink_rect)
    *ink_rect = info->ink_rect;
  if (logical_rect)
    *logical_rect = info->logical_rect;
}

/**
 * pango_ft2_font_get_kerning:
 * @font: a #PangoFont
 * @left: the left #PangoGlyph
 * @right: the right #PangoGlyph
 *
 * Retrieves kerning information for a combination of two glyphs.
 *
 * Use pango_fc_font_kern_glyphs() instead.
 *
 * Return value: The amount of kerning (in Pango units) to apply for
 * the given combination of glyphs.
 **/
int
pango_ft2_font_get_kerning (PangoFont *font,
			    PangoGlyph left,
			    PangoGlyph right)
{
  PangoFcFont *fc_font = PANGO_FC_FONT (font);

  FT_Face face;
  FT_Error error;
  FT_Vector kerning;

  face = pango_fc_font_lock_face (fc_font);
  if (!face)
    return 0;

  if (!FT_HAS_KERNING (face))
    {
      pango_fc_font_unlock_face (fc_font);
      return 0;
    }

  error = FT_Get_Kerning (face, left, right, ft_kerning_default, &kerning);
  if (error != FT_Err_Ok)
    {
      pango_fc_font_unlock_face (fc_font);
      return 0;
    }

  pango_fc_font_unlock_face (fc_font);
  return PANGO_UNITS_26_6 (kerning.x);
}

static FT_Face
pango_ft2_font_real_lock_face (PangoFcFont *font)
{
  return pango_ft2_font_get_face ((PangoFont *)font);
}

static void
pango_ft2_font_real_unlock_face (PangoFcFont *font)
{
}

static gboolean
pango_ft2_free_glyph_info_callback (gpointer key,
				    gpointer value,
				    gpointer data)
{
  PangoFT2Font *font = PANGO_FT2_FONT (data);
  PangoFT2GlyphInfo *info = value;

  if (font->glyph_cache_destroy && info->cached_glyph)
    (*font->glyph_cache_destroy) (info->cached_glyph);

  g_slice_free (PangoFT2GlyphInfo, info);
  return TRUE;
}

static void
pango_ft2_font_finalize (GObject *object)
{
  PangoFT2Font *ft2font = (PangoFT2Font *)object;

  if (ft2font->face)
    {
      FT_Done_Face (ft2font->face);
      ft2font->face = NULL;
    }

  g_hash_table_foreach_remove (ft2font->glyph_info,
			       pango_ft2_free_glyph_info_callback, object);
  g_hash_table_destroy (ft2font->glyph_info);

  G_OBJECT_CLASS (pango_ft2_font_parent_class)->finalize (object);
}

/**
 * pango_ft2_font_get_coverage:
 * @font: a #PangoFT2Font.
 * @language: a language tag.
 * @returns: a #PangoCoverage.
 *
 * Gets the #PangoCoverage for a #PangoFT2Font. Use pango_font_get_coverage() instead.
 **/
PangoCoverage *
pango_ft2_font_get_coverage (PangoFont     *font,
			     PangoLanguage *language)
{
  return pango_font_get_coverage (font, language);
}

/* Utility functions */

/**
 * pango_ft2_get_unknown_glyph:
 * @font: a #PangoFont
 *
 * Return the index of a glyph suitable for drawing unknown characters with
 * @font, or %PANGO_GLYPH_EMPTY if no suitable glyph found.
 *
 * If you want to draw an unknown-box for a character that is not covered
 * by the font,
 * use PANGO_GET_UNKNOWN_GLYPH() instead.
 *
 * Return value: a glyph index into @font, or %PANGO_GLYPH_EMPTY
 **/
PangoGlyph
pango_ft2_get_unknown_glyph (PangoFont *font)
{
  FT_Face face = pango_ft2_font_get_face (font);
  if (face && FT_IS_SFNT (face))
    /* TrueType fonts have an 'unknown glyph' box on glyph index 0 */
    return 0;
  else
    return PANGO_GLYPH_EMPTY;
}

typedef struct
{
  FT_Error     code;
  const char   msg[40];
} ft_error_description;

static int
ft_error_compare (const void *pkey,
		  const void *pbase)
{
  return ((ft_error_description *) pkey)->code - ((ft_error_description *) pbase)->code;
}

G_CONST_RETURN char *
_pango_ft2_ft_strerror (FT_Error error)
{
#undef __FTERRORS_H__
#define FT_ERRORDEF( e, v, s )  { e, s },
#define FT_ERROR_START_LIST  {
#define FT_ERROR_END_LIST    };

  static const ft_error_description ft_errors[] =
#include FT_ERRORS_H

#undef FT_ERRORDEF
#undef FT_ERROR_START_LIST
#undef FT_ERROR_END_LIST

  ft_error_description *found =
    bsearch (&error, ft_errors, G_N_ELEMENTS (ft_errors),
	     sizeof (ft_errors[0]), ft_error_compare);
  if (found != NULL)
    return found->msg;
  else
    {
      static char *default_msg = NULL;

      if (!default_msg)
	default_msg = g_malloc (60);

      g_sprintf (default_msg, "Unknown FreeType2 error %#x", error);
      return default_msg;
    }
}

void *
_pango_ft2_font_get_cache_glyph_data (PangoFont *font,
				     int        glyph_index)
{
  PangoFT2GlyphInfo *info;

  if (!PANGO_FT2_IS_FONT (font))
    return NULL;

  info = pango_ft2_font_get_glyph_info (font, glyph_index, FALSE);

  if (info == NULL)
    return NULL;

  return info->cached_glyph;
}

void
_pango_ft2_font_set_cache_glyph_data (PangoFont     *font,
				     int            glyph_index,
				     void          *cached_glyph)
{
  PangoFT2GlyphInfo *info;

  if (!PANGO_FT2_IS_FONT (font))
    return;

  info = pango_ft2_font_get_glyph_info (font, glyph_index, TRUE);

  info->cached_glyph = cached_glyph;

  /* TODO: Implement limiting of the number of cached glyphs */
}

void
_pango_ft2_font_set_glyph_cache_destroy (PangoFont      *font,
					 GDestroyNotify  destroy_notify)
{
  if (!PANGO_FT2_IS_FONT (font))
    return;

  PANGO_FT2_FONT (font)->glyph_cache_destroy = destroy_notify;
}