summaryrefslogtreecommitdiffstats
path: root/gfx/cairo/cairo/src/cairo-user-font.c
blob: a26fb57ee1098099b17b290f586d5b28c7f0ba00 (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
/* cairo - a vector graphics library with display and print output
 *
 * Copyright © 2006, 2008 Red Hat, Inc
 *
 * This library is free software; you can redistribute it and/or
 * modify it either under the terms of the GNU Lesser General Public
 * License version 2.1 as published by the Free Software Foundation
 * (the "LGPL") or, at your option, under the terms of the Mozilla
 * Public License Version 1.1 (the "MPL"). If you do not alter this
 * notice, a recipient may use your version of this file under either
 * the MPL or the LGPL.
 *
 * You should have received a copy of the LGPL along with this library
 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
 * You should have received a copy of the MPL along with this library
 * in the file COPYING-MPL-1.1
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
 * the specific language governing rights and limitations.
 *
 * The Original Code is the cairo graphics library.
 *
 * The Initial Developer of the Original Code is Red Hat, Inc.
 *
 * Contributor(s):
 *      Kristian Høgsberg <krh@redhat.com>
 *      Behdad Esfahbod <behdad@behdad.org>
 */

#include "cairoint.h"
#include "cairo-user-font-private.h"
#include "cairo-recording-surface-private.h"
#include "cairo-analysis-surface-private.h"
#include "cairo-error-private.h"

/**
 * SECTION:cairo-user-fonts
 * @Title:User Fonts
 * @Short_Description: Font support with font data provided by the user
 * 
 * The user-font feature allows the cairo user to provide drawings for glyphs
 * in a font.  This is most useful in implementing fonts in non-standard
 * formats, like SVG fonts and Flash fonts, but can also be used by games and
 * other application to draw "funky" fonts.
 **/

/**
 * CAIRO_HAS_USER_FONT:
 *
 * Defined if the user font backend is available.
 * This macro can be used to conditionally compile backend-specific code.
 * The user font backend is always built in versions of cairo that support
 * this feature (1.8 and later).
 *
 * Since: 1.8
 **/

typedef struct _cairo_user_scaled_font_methods {
    cairo_user_scaled_font_init_func_t			init;
    cairo_user_scaled_font_render_glyph_func_t		render_glyph;
    cairo_user_scaled_font_unicode_to_glyph_func_t	unicode_to_glyph;
    cairo_user_scaled_font_text_to_glyphs_func_t	text_to_glyphs;
} cairo_user_scaled_font_methods_t;

typedef struct _cairo_user_font_face {
    cairo_font_face_t	             base;

    /* Set to true after first scaled font is created.  At that point,
     * the scaled_font_methods cannot change anymore. */
    cairo_bool_t		     immutable;

    cairo_user_scaled_font_methods_t scaled_font_methods;
} cairo_user_font_face_t;

typedef struct _cairo_user_scaled_font {
    cairo_scaled_font_t  base;

    cairo_text_extents_t default_glyph_extents;

    /* space to compute extents in, and factors to convert back to user space */
    cairo_matrix_t extent_scale;
    double extent_x_scale;
    double extent_y_scale;

    /* multiplier for metrics hinting */
    double snap_x_scale;
    double snap_y_scale;

} cairo_user_scaled_font_t;

/* #cairo_user_scaled_font_t */

static cairo_surface_t *
_cairo_user_scaled_font_create_recording_surface (const cairo_user_scaled_font_t *scaled_font)
{
    cairo_content_t content;

    content = scaled_font->base.options.antialias == CAIRO_ANTIALIAS_SUBPIXEL ?
						     CAIRO_CONTENT_COLOR_ALPHA :
						     CAIRO_CONTENT_ALPHA;

    return cairo_recording_surface_create (content, NULL);
}


static cairo_t *
_cairo_user_scaled_font_create_recording_context (const cairo_user_scaled_font_t *scaled_font,
						  cairo_surface_t                *recording_surface)
{
    cairo_t *cr;

    cr = cairo_create (recording_surface);

    if (!_cairo_matrix_is_scale_0 (&scaled_font->base.scale)) {
        cairo_matrix_t scale;
	scale = scaled_font->base.scale;
	scale.x0 = scale.y0 = 0.;
	cairo_set_matrix (cr, &scale);
    }

    cairo_set_font_size (cr, 1.0);
    cairo_set_font_options (cr, &scaled_font->base.options);
    cairo_set_source_rgb (cr, 1., 1., 1.);

    return cr;
}

static cairo_int_status_t
_cairo_user_scaled_glyph_init (void			 *abstract_font,
			       cairo_scaled_glyph_t	 *scaled_glyph,
			       cairo_scaled_glyph_info_t  info)
{
    cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
    cairo_user_scaled_font_t *scaled_font = abstract_font;
    cairo_surface_t *recording_surface = scaled_glyph->recording_surface;

    if (!scaled_glyph->recording_surface) {
	cairo_user_font_face_t *face =
	    (cairo_user_font_face_t *) scaled_font->base.font_face;
	cairo_text_extents_t extents = scaled_font->default_glyph_extents;
	cairo_t *cr;

	if (!face->scaled_font_methods.render_glyph)
	    return CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED;

	recording_surface = _cairo_user_scaled_font_create_recording_surface (scaled_font);

	/* special case for 0 rank matrix (as in _cairo_scaled_font_init): empty surface */
        if (!_cairo_matrix_is_scale_0 (&scaled_font->base.scale)) {
	    cr = _cairo_user_scaled_font_create_recording_context (scaled_font, recording_surface);
	    status = face->scaled_font_methods.render_glyph ((cairo_scaled_font_t *)scaled_font,
							     _cairo_scaled_glyph_index(scaled_glyph),
							     cr, &extents);
	    if (status == CAIRO_INT_STATUS_SUCCESS)
	        status = cairo_status (cr);

	    cairo_destroy (cr);

	    if (unlikely (status)) {
	        cairo_surface_destroy (recording_surface);
	        return status;
	    }
	}

	_cairo_scaled_glyph_set_recording_surface (scaled_glyph,
						   &scaled_font->base,
						   recording_surface);


	/* set metrics */

	if (extents.width == 0.) {
	    cairo_box_t bbox;
	    double x1, y1, x2, y2;
	    double x_scale, y_scale;

	    /* Compute extents.x/y/width/height from recording_surface,
	     * in font space.
	     */
	    status = _cairo_recording_surface_get_bbox ((cairo_recording_surface_t *) recording_surface,
							&bbox,
							&scaled_font->extent_scale);
	    if (unlikely (status))
		return status;

	    _cairo_box_to_doubles (&bbox, &x1, &y1, &x2, &y2);

	    x_scale = scaled_font->extent_x_scale;
	    y_scale = scaled_font->extent_y_scale;
	    extents.x_bearing = x1 * x_scale;
	    extents.y_bearing = y1 * y_scale;
	    extents.width     = (x2 - x1) * x_scale;
	    extents.height    = (y2 - y1) * y_scale;
	}

	if (scaled_font->base.options.hint_metrics != CAIRO_HINT_METRICS_OFF) {
	    extents.x_advance = _cairo_lround (extents.x_advance / scaled_font->snap_x_scale) * scaled_font->snap_x_scale;
	    extents.y_advance = _cairo_lround (extents.y_advance / scaled_font->snap_y_scale) * scaled_font->snap_y_scale;
	}

	_cairo_scaled_glyph_set_metrics (scaled_glyph,
					 &scaled_font->base,
					 &extents);
    }

    if (info & CAIRO_SCALED_GLYPH_INFO_SURFACE) {
	cairo_surface_t	*surface;
	cairo_format_t format;
	int width, height;

	/* TODO
	 * extend the glyph cache to support argb glyphs.
	 * need to figure out the semantics and interaction with subpixel
	 * rendering first.
	 */

	width = _cairo_fixed_integer_ceil (scaled_glyph->bbox.p2.x) -
	  _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.x);
	height = _cairo_fixed_integer_ceil (scaled_glyph->bbox.p2.y) -
	  _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.y);

	switch (scaled_font->base.options.antialias) {
	default:
	case CAIRO_ANTIALIAS_DEFAULT:
	case CAIRO_ANTIALIAS_FAST:
	case CAIRO_ANTIALIAS_GOOD:
	case CAIRO_ANTIALIAS_GRAY:	format = CAIRO_FORMAT_A8;	break;
	case CAIRO_ANTIALIAS_NONE:	format = CAIRO_FORMAT_A1;	break;
	case CAIRO_ANTIALIAS_BEST:
	case CAIRO_ANTIALIAS_SUBPIXEL:	format = CAIRO_FORMAT_ARGB32;	break;
	}
	surface = cairo_image_surface_create (format, width, height);

	cairo_surface_set_device_offset (surface,
	                                 - _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.x),
	                                 - _cairo_fixed_integer_floor (scaled_glyph->bbox.p1.y));
	status = _cairo_recording_surface_replay (recording_surface, surface);

	if (unlikely (status)) {
	    cairo_surface_destroy(surface);
	    return status;
	}

	_cairo_scaled_glyph_set_surface (scaled_glyph,
					 &scaled_font->base,
					 (cairo_image_surface_t *) surface);
    }

    if (info & CAIRO_SCALED_GLYPH_INFO_PATH) {
	cairo_path_fixed_t *path = _cairo_path_fixed_create ();
	if (!path)
	    return _cairo_error (CAIRO_STATUS_NO_MEMORY);

	status = _cairo_recording_surface_get_path (recording_surface, path);
	if (unlikely (status)) {
	    _cairo_path_fixed_destroy (path);
	    return status;
	}

	_cairo_scaled_glyph_set_path (scaled_glyph,
				      &scaled_font->base,
				      path);
    }

    return status;
}

static unsigned long
_cairo_user_ucs4_to_index (void	    *abstract_font,
			   uint32_t  ucs4)
{
    cairo_user_scaled_font_t *scaled_font = abstract_font;
    cairo_user_font_face_t *face =
	(cairo_user_font_face_t *) scaled_font->base.font_face;
    unsigned long glyph = 0;

    if (face->scaled_font_methods.unicode_to_glyph) {
	cairo_status_t status;

	status = face->scaled_font_methods.unicode_to_glyph (&scaled_font->base,
							     ucs4, &glyph);

	if (status == CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
	    goto not_implemented;

	if (status != CAIRO_STATUS_SUCCESS) {
	    status = _cairo_scaled_font_set_error (&scaled_font->base, status);
	    glyph = 0;
	}

    } else {
not_implemented:
	glyph = ucs4;
    }

    return glyph;
}

static cairo_int_status_t
_cairo_user_text_to_glyphs (void		      *abstract_font,
			    double		       x,
			    double		       y,
			    const char		      *utf8,
			    int			       utf8_len,
			    cairo_glyph_t	     **glyphs,
			    int			       *num_glyphs,
			    cairo_text_cluster_t      **clusters,
			    int			       *num_clusters,
			    cairo_text_cluster_flags_t *cluster_flags)
{
    cairo_int_status_t status = CAIRO_INT_STATUS_UNSUPPORTED;

    cairo_user_scaled_font_t *scaled_font = abstract_font;
    cairo_user_font_face_t *face =
	(cairo_user_font_face_t *) scaled_font->base.font_face;

    if (face->scaled_font_methods.text_to_glyphs) {
	int i;
	cairo_glyph_t *orig_glyphs = *glyphs;
	int orig_num_glyphs = *num_glyphs;

	status = face->scaled_font_methods.text_to_glyphs (&scaled_font->base,
							   utf8, utf8_len,
							   glyphs, num_glyphs,
							   clusters, num_clusters, cluster_flags);

	if (status != CAIRO_INT_STATUS_SUCCESS &&
	    status != CAIRO_INT_STATUS_USER_FONT_NOT_IMPLEMENTED)
	    return status;

	if (status == CAIRO_INT_STATUS_USER_FONT_NOT_IMPLEMENTED ||
	    *num_glyphs < 0) {
	    if (orig_glyphs != *glyphs) {
		cairo_glyph_free (*glyphs);
		*glyphs = orig_glyphs;
	    }
	    *num_glyphs = orig_num_glyphs;
	    return CAIRO_INT_STATUS_UNSUPPORTED;
	}

	/* Convert from font space to user space and add x,y */
	for (i = 0; i < *num_glyphs; i++) {
	    double gx = (*glyphs)[i].x;
	    double gy = (*glyphs)[i].y;

	    cairo_matrix_transform_point (&scaled_font->base.font_matrix,
					  &gx, &gy);

	    (*glyphs)[i].x = gx + x;
	    (*glyphs)[i].y = gy + y;
	}
    }

    return status;
}

static cairo_status_t
_cairo_user_font_face_scaled_font_create (void                        *abstract_face,
					  const cairo_matrix_t        *font_matrix,
					  const cairo_matrix_t        *ctm,
					  const cairo_font_options_t  *options,
					  cairo_scaled_font_t        **scaled_font);

static cairo_status_t
_cairo_user_font_face_create_for_toy (cairo_toy_font_face_t   *toy_face,
				      cairo_font_face_t      **font_face)
{
    return _cairo_font_face_twin_create_for_toy (toy_face, font_face);
}

static const cairo_scaled_font_backend_t _cairo_user_scaled_font_backend = {
    CAIRO_FONT_TYPE_USER,
    NULL,	/* scaled_font_fini */
    _cairo_user_scaled_glyph_init,
    _cairo_user_text_to_glyphs,
    _cairo_user_ucs4_to_index,
    NULL,	/* show_glyphs */
    NULL,	/* load_truetype_table */
    NULL	/* index_to_ucs4 */
};

/* #cairo_user_font_face_t */

static cairo_status_t
_cairo_user_font_face_scaled_font_create (void                        *abstract_face,
					  const cairo_matrix_t        *font_matrix,
					  const cairo_matrix_t        *ctm,
					  const cairo_font_options_t  *options,
					  cairo_scaled_font_t        **scaled_font)
{
    cairo_status_t status = CAIRO_STATUS_SUCCESS;
    cairo_user_font_face_t *font_face = abstract_face;
    cairo_user_scaled_font_t *user_scaled_font = NULL;
    cairo_font_extents_t font_extents = {1., 0., 1., 1., 0.};

    font_face->immutable = TRUE;

    user_scaled_font = _cairo_malloc (sizeof (cairo_user_scaled_font_t));
    if (unlikely (user_scaled_font == NULL))
	return _cairo_error (CAIRO_STATUS_NO_MEMORY);

    status = _cairo_scaled_font_init (&user_scaled_font->base,
				      &font_face->base,
				      font_matrix, ctm, options,
				      &_cairo_user_scaled_font_backend);

    if (unlikely (status)) {
	free (user_scaled_font);
	return status;
    }

    /* XXX metrics hinting? */

    /* compute a normalized version of font scale matrix to compute
     * extents in.  This is to minimize error caused by the cairo_fixed_t
     * representation. */
    {
	double fixed_scale, x_scale, y_scale;

	user_scaled_font->extent_scale = user_scaled_font->base.scale_inverse;
	status = _cairo_matrix_compute_basis_scale_factors (&user_scaled_font->extent_scale,
						      &x_scale, &y_scale,
						      1);
	if (status == CAIRO_STATUS_SUCCESS) {

	    if (x_scale == 0) x_scale = 1.;
	    if (y_scale == 0) y_scale = 1.;

	    user_scaled_font->snap_x_scale = x_scale;
	    user_scaled_font->snap_y_scale = y_scale;

	    /* since glyphs are pretty much 1.0x1.0, we can reduce error by
	     * scaling to a larger square.  say, 1024.x1024. */
	    fixed_scale = 1024.;
	    x_scale /= fixed_scale;
	    y_scale /= fixed_scale;

	    cairo_matrix_scale (&user_scaled_font->extent_scale, 1. / x_scale, 1. / y_scale);

	    user_scaled_font->extent_x_scale = x_scale;
	    user_scaled_font->extent_y_scale = y_scale;
	}
    }

    if (status == CAIRO_STATUS_SUCCESS &&
	font_face->scaled_font_methods.init != NULL)
    {
	/* Lock the scaled_font mutex such that user doesn't accidentally try
         * to use it just yet. */
	CAIRO_MUTEX_LOCK (user_scaled_font->base.mutex);

	/* Give away fontmap lock such that user-font can use other fonts */
	status = _cairo_scaled_font_register_placeholder_and_unlock_font_map (&user_scaled_font->base);
	if (status == CAIRO_STATUS_SUCCESS) {
	    cairo_surface_t *recording_surface;
	    cairo_t *cr;

	    recording_surface = _cairo_user_scaled_font_create_recording_surface (user_scaled_font);
	    cr = _cairo_user_scaled_font_create_recording_context (user_scaled_font, recording_surface);
	    cairo_surface_destroy (recording_surface);

	    status = font_face->scaled_font_methods.init (&user_scaled_font->base,
							  cr,
							  &font_extents);

	    if (status == CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED)
		status = CAIRO_STATUS_SUCCESS;

	    if (status == CAIRO_STATUS_SUCCESS)
		status = cairo_status (cr);

	    cairo_destroy (cr);

	    _cairo_scaled_font_unregister_placeholder_and_lock_font_map (&user_scaled_font->base);
	}

	CAIRO_MUTEX_UNLOCK (user_scaled_font->base.mutex);
    }

    if (status == CAIRO_STATUS_SUCCESS)
	status = _cairo_scaled_font_set_metrics (&user_scaled_font->base, &font_extents);

    if (status != CAIRO_STATUS_SUCCESS) {
        _cairo_scaled_font_fini (&user_scaled_font->base);
	free (user_scaled_font);
    } else {
        user_scaled_font->default_glyph_extents.x_bearing = 0.;
        user_scaled_font->default_glyph_extents.y_bearing = -font_extents.ascent;
        user_scaled_font->default_glyph_extents.width = 0.;
        user_scaled_font->default_glyph_extents.height = font_extents.ascent + font_extents.descent;
        user_scaled_font->default_glyph_extents.x_advance = font_extents.max_x_advance;
        user_scaled_font->default_glyph_extents.y_advance = 0.;

	*scaled_font = &user_scaled_font->base;
    }

    return status;
}

const cairo_font_face_backend_t _cairo_user_font_face_backend = {
    CAIRO_FONT_TYPE_USER,
    _cairo_user_font_face_create_for_toy,
    _cairo_font_face_destroy,
    _cairo_user_font_face_scaled_font_create
};


cairo_bool_t
_cairo_font_face_is_user (cairo_font_face_t *font_face)
{
    return font_face->backend == &_cairo_user_font_face_backend;
}

/* Implement the public interface */

/**
 * cairo_user_font_face_create:
 *
 * Creates a new user font-face.
 *
 * Use the setter functions to associate callbacks with the returned
 * user font.  The only mandatory callback is render_glyph.
 *
 * After the font-face is created, the user can attach arbitrary data
 * (the actual font data) to it using cairo_font_face_set_user_data()
 * and access it from the user-font callbacks by using
 * cairo_scaled_font_get_font_face() followed by
 * cairo_font_face_get_user_data().
 *
 * Return value: a newly created #cairo_font_face_t. Free with
 *  cairo_font_face_destroy() when you are done using it.
 *
 * Since: 1.8
 **/
cairo_font_face_t *
cairo_user_font_face_create (void)
{
    cairo_user_font_face_t *font_face;

    font_face = _cairo_malloc (sizeof (cairo_user_font_face_t));
    if (!font_face) {
	_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
	return (cairo_font_face_t *)&_cairo_font_face_nil;
    }

    _cairo_font_face_init (&font_face->base, &_cairo_user_font_face_backend);

    font_face->immutable = FALSE;
    memset (&font_face->scaled_font_methods, 0, sizeof (font_face->scaled_font_methods));

    return &font_face->base;
}
slim_hidden_def(cairo_user_font_face_create);

/* User-font method setters */


/**
 * cairo_user_font_face_set_init_func:
 * @font_face: A user font face
 * @init_func: The init callback, or %NULL
 *
 * Sets the scaled-font initialization function of a user-font.
 * See #cairo_user_scaled_font_init_func_t for details of how the callback
 * works.
 *
 * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
 * error will occur.  A user font-face is immutable as soon as a scaled-font
 * is created from it.
 *
 * Since: 1.8
 **/
void
cairo_user_font_face_set_init_func (cairo_font_face_t                  *font_face,
				    cairo_user_scaled_font_init_func_t  init_func)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    if (user_font_face->immutable) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
	    return;
    }
    user_font_face->scaled_font_methods.init = init_func;
}
slim_hidden_def(cairo_user_font_face_set_init_func);

/**
 * cairo_user_font_face_set_render_glyph_func:
 * @font_face: A user font face
 * @render_glyph_func: The render_glyph callback, or %NULL
 *
 * Sets the glyph rendering function of a user-font.
 * See #cairo_user_scaled_font_render_glyph_func_t for details of how the callback
 * works.
 *
 * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
 * error will occur.  A user font-face is immutable as soon as a scaled-font
 * is created from it.
 *
 * The render_glyph callback is the only mandatory callback of a user-font.
 * If the callback is %NULL and a glyph is tried to be rendered using
 * @font_face, a %CAIRO_STATUS_USER_FONT_ERROR will occur.
 *
 * Since: 1.8
 **/
void
cairo_user_font_face_set_render_glyph_func (cairo_font_face_t                          *font_face,
					    cairo_user_scaled_font_render_glyph_func_t  render_glyph_func)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    if (user_font_face->immutable) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
	    return;
    }
    user_font_face->scaled_font_methods.render_glyph = render_glyph_func;
}
slim_hidden_def(cairo_user_font_face_set_render_glyph_func);

/**
 * cairo_user_font_face_set_text_to_glyphs_func:
 * @font_face: A user font face
 * @text_to_glyphs_func: The text_to_glyphs callback, or %NULL
 *
 * Sets th text-to-glyphs conversion function of a user-font.
 * See #cairo_user_scaled_font_text_to_glyphs_func_t for details of how the callback
 * works.
 *
 * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
 * error will occur.  A user font-face is immutable as soon as a scaled-font
 * is created from it.
 *
 * Since: 1.8
 **/
void
cairo_user_font_face_set_text_to_glyphs_func (cairo_font_face_t                            *font_face,
					      cairo_user_scaled_font_text_to_glyphs_func_t  text_to_glyphs_func)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    if (user_font_face->immutable) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
	    return;
    }
    user_font_face->scaled_font_methods.text_to_glyphs = text_to_glyphs_func;
}

/**
 * cairo_user_font_face_set_unicode_to_glyph_func:
 * @font_face: A user font face
 * @unicode_to_glyph_func: The unicode_to_glyph callback, or %NULL
 *
 * Sets the unicode-to-glyph conversion function of a user-font.
 * See #cairo_user_scaled_font_unicode_to_glyph_func_t for details of how the callback
 * works.
 *
 * The font-face should not be immutable or a %CAIRO_STATUS_USER_FONT_IMMUTABLE
 * error will occur.  A user font-face is immutable as soon as a scaled-font
 * is created from it.
 *
 * Since: 1.8
 **/
void
cairo_user_font_face_set_unicode_to_glyph_func (cairo_font_face_t                              *font_face,
						cairo_user_scaled_font_unicode_to_glyph_func_t  unicode_to_glyph_func)
{
    cairo_user_font_face_t *user_font_face;
    if (font_face->status)
	return;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    if (user_font_face->immutable) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_USER_FONT_IMMUTABLE))
	    return;
    }
    user_font_face->scaled_font_methods.unicode_to_glyph = unicode_to_glyph_func;
}
slim_hidden_def(cairo_user_font_face_set_unicode_to_glyph_func);

/* User-font method getters */

/**
 * cairo_user_font_face_get_init_func:
 * @font_face: A user font face
 *
 * Gets the scaled-font initialization function of a user-font.
 *
 * Return value: The init callback of @font_face
 * or %NULL if none set or an error has occurred.
 *
 * Since: 1.8
 **/
cairo_user_scaled_font_init_func_t
cairo_user_font_face_get_init_func (cairo_font_face_t *font_face)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return NULL;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return NULL;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    return user_font_face->scaled_font_methods.init;
}

/**
 * cairo_user_font_face_get_render_glyph_func:
 * @font_face: A user font face
 *
 * Gets the glyph rendering function of a user-font.
 *
 * Return value: The render_glyph callback of @font_face
 * or %NULL if none set or an error has occurred.
 *
 * Since: 1.8
 **/
cairo_user_scaled_font_render_glyph_func_t
cairo_user_font_face_get_render_glyph_func (cairo_font_face_t *font_face)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return NULL;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return NULL;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    return user_font_face->scaled_font_methods.render_glyph;
}

/**
 * cairo_user_font_face_get_text_to_glyphs_func:
 * @font_face: A user font face
 *
 * Gets the text-to-glyphs conversion function of a user-font.
 *
 * Return value: The text_to_glyphs callback of @font_face
 * or %NULL if none set or an error occurred.
 *
 * Since: 1.8
 **/
cairo_user_scaled_font_text_to_glyphs_func_t
cairo_user_font_face_get_text_to_glyphs_func (cairo_font_face_t *font_face)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return NULL;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return NULL;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    return user_font_face->scaled_font_methods.text_to_glyphs;
}

/**
 * cairo_user_font_face_get_unicode_to_glyph_func:
 * @font_face: A user font face
 *
 * Gets the unicode-to-glyph conversion function of a user-font.
 *
 * Return value: The unicode_to_glyph callback of @font_face
 * or %NULL if none set or an error occurred.
 *
 * Since: 1.8
 **/
cairo_user_scaled_font_unicode_to_glyph_func_t
cairo_user_font_face_get_unicode_to_glyph_func (cairo_font_face_t *font_face)
{
    cairo_user_font_face_t *user_font_face;

    if (font_face->status)
	return NULL;

    if (! _cairo_font_face_is_user (font_face)) {
	if (_cairo_font_face_set_error (font_face, CAIRO_STATUS_FONT_TYPE_MISMATCH))
	    return NULL;
    }

    user_font_face = (cairo_user_font_face_t *) font_face;
    return user_font_face->scaled_font_methods.unicode_to_glyph;
}