summaryrefslogtreecommitdiff
path: root/gdk-pixbuf/gdk-pixbuf-animation.c
blob: c8f2695e305ca171e8d342a643af4286182ae4cb (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
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/* GdkPixbuf library - Simple animation support
 *
 * Copyright (C) 1999 The Free Software Foundation
 *
 * Authors: Jonathan Blandford <jrb@redhat.com>
 *          Havoc Pennington <hp@redhat.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#include <errno.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-animation.h"
#include "gdk-pixbuf-loader.h"

#include <glib/gstdio.h>

/**
 * SECTION:animation
 * @Short_description: Animated images.
 * @Title: Animations
 * @See_also: #GdkPixbufLoader.
 *
 * The GdkPixBuf library provides a simple mechanism to load and
 * represent animations. An animation is conceptually a series of
 * frames to be displayed over time. The animation may not be
 * represented as a series of frames internally; for example, it may
 * be stored as a sprite and instructions for moving the sprite around
 * a background. To display an animation you don't need to understand
 * its representation, however; you just ask GdkPixBuf what should
 * be displayed at a given point in time.
 */

typedef struct _GdkPixbufNonAnim GdkPixbufNonAnim;
typedef struct _GdkPixbufNonAnimClass GdkPixbufNonAnimClass;

#define GDK_TYPE_PIXBUF_NON_ANIM              (gdk_pixbuf_non_anim_get_type ())
#define GDK_PIXBUF_NON_ANIM(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnim))
#define GDK_IS_PIXBUF_NON_ANIM(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF_NON_ANIM))

#define GDK_PIXBUF_NON_ANIM_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnimClass))
#define GDK_IS_PIXBUF_NON_ANIM_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_PIXBUF_NON_ANIM))
#define GDK_PIXBUF_NON_ANIM_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnimClass))

/* Private part of the GdkPixbufNonAnim structure */
struct _GdkPixbufNonAnim {
        GdkPixbufAnimation parent_instance;

        GdkPixbuf *pixbuf;
};

struct _GdkPixbufNonAnimClass {
        GdkPixbufAnimationClass parent_class;
};


typedef struct _GdkPixbufNonAnimIter GdkPixbufNonAnimIter;
typedef struct _GdkPixbufNonAnimIterClass GdkPixbufNonAnimIterClass;


#define GDK_TYPE_PIXBUF_NON_ANIM_ITER              (gdk_pixbuf_non_anim_iter_get_type ())
#define GDK_PIXBUF_NON_ANIM_ITER(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIter))
#define GDK_IS_PIXBUF_NON_ANIM_ITER(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF_NON_ANIM_ITER))

#define GDK_PIXBUF_NON_ANIM_ITER_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIterClass))
#define GDK_IS_PIXBUF_NON_ANIM_ITER_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_PIXBUF_NON_ANIM_ITER))
#define GDK_PIXBUF_NON_ANIM_ITER_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIterClass))

struct _GdkPixbufNonAnimIter {
        GdkPixbufAnimationIter parent_instance;

        GdkPixbufNonAnim   *non_anim;
};

struct _GdkPixbufNonAnimIterClass {
        GdkPixbufAnimationIterClass parent_class;

};

static GType gdk_pixbuf_non_anim_iter_get_type (void) G_GNUC_CONST;

G_DEFINE_TYPE (GdkPixbufAnimation, gdk_pixbuf_animation, G_TYPE_OBJECT);

static void
gdk_pixbuf_animation_class_init (GdkPixbufAnimationClass *klass)
{
}

static void
gdk_pixbuf_animation_init (GdkPixbufAnimation *animation)
{
}

static void
noop_size_notify (gint     *width,
		  gint     *height,
		  gpointer  data)
{
}

static void
prepared_notify (GdkPixbuf          *pixbuf,
                 GdkPixbufAnimation *anim,
                 gpointer            user_data)
{
        if (anim != NULL)
                g_object_ref (anim);
        else
                anim = gdk_pixbuf_non_anim_new (pixbuf);

        *((GdkPixbufAnimation **)user_data) = anim;
}

static void
noop_updated_notify (GdkPixbuf *pixbuf,
                     int        x,
                     int        y,
                     int        width,
                     int        height,
                     gpointer   user_data)
{
}

/**
 * gdk_pixbuf_animation_new_from_file:
 * @filename: (type filename): Name of file to load, in the GLib file
 *     name encoding
 * @error: return location for error
 *
 * Creates a new animation by loading it from a file. The file format is
 * detected automatically. If the file's format does not support multi-frame
 * images, then an animation with a single frame will be created. Possible errors
 * are in the #GDK_PIXBUF_ERROR and #G_FILE_ERROR domains.
 *
 * Return value: A newly-created animation with a reference count of 1, or %NULL
 * if any of several error conditions ocurred:  the file could not be opened,
 * there was no loader for the file's format, there was not enough memory to
 * allocate the image buffer, or the image file contained invalid data.
 */
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_file (const gchar  *filename,
                                    GError      **error)
{
	GdkPixbufAnimation *animation;
	int size;
	FILE *f;
	guchar buffer[SNIFF_BUFFER_SIZE];
	GdkPixbufModule *image_module;
        gchar *display_name;

	g_return_val_if_fail (filename != NULL, NULL);
        g_return_val_if_fail (error == NULL || *error == NULL, NULL);

        display_name = g_filename_display_name (filename);
	f = g_fopen (filename, "rb");
	if (!f) {
                gint save_errno = errno;
                g_set_error (error,
                             G_FILE_ERROR,
                             g_file_error_from_errno (save_errno),
                             _("Failed to open file “%s”: %s"),
                             display_name,
                             g_strerror (save_errno));
                g_free (display_name);
		return NULL;
        }

	size = fread (&buffer, 1, sizeof (buffer), f);

	if (size == 0) {
                g_set_error (error,
                             GDK_PIXBUF_ERROR,
                             GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
                             _("Image file “%s” contains no data"),
                             display_name);
                g_free (display_name);
		fclose (f);
		return NULL;
	}

	image_module = _gdk_pixbuf_get_module (buffer, size, filename, error);
	if (!image_module) {
                g_free (display_name);
		fclose (f);
		return NULL;
	}

	if (image_module->module == NULL)
                if (!_gdk_pixbuf_load_module (image_module, error)) {
                        g_free (display_name);
                        fclose (f);
                        return NULL;
                }

	if (image_module->load_animation != NULL) {
		fseek (f, 0, SEEK_SET);
		animation = (* image_module->load_animation) (f, error);

                if (animation == NULL && error != NULL && *error == NULL) {
                        /* I don't trust these crufty longjmp()'ing
                         * image libs to maintain proper error
                         * invariants, and I don't want user code to
                         * segfault as a result. We need to maintain
                         * the invariant that error gets set if NULL
                         * is returned.
                         */
                        g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.",
                                   image_module->module_name);
                        g_set_error (error,
                                     GDK_PIXBUF_ERROR,
                                     GDK_PIXBUF_ERROR_FAILED,
                                     _("Failed to load animation “%s”: reason not known, probably a corrupt animation file"),
                                     display_name);
                }

		fclose (f);
        } else if (image_module->begin_load != NULL) {
                guchar buffer[4096];
                size_t length;
                gpointer context;
                gboolean success;

                success = FALSE;
                animation = NULL;
		fseek (f, 0, SEEK_SET);

                context = image_module->begin_load (noop_size_notify, prepared_notify, noop_updated_notify, &animation, error);
                if (!context)
                        goto fail_begin_load;

                while (!feof (f) && !ferror (f)) {
                        length = fread (buffer, 1, sizeof (buffer), f);
                        if (length > 0) {
                                if (!image_module->load_increment (context, buffer, length, error)) {
                                        error = NULL;
                                        goto fail_load_increment;
                                }
                        }
                }

                success = TRUE;

fail_load_increment:
                if (!image_module->stop_load (context, error))
                        success = FALSE;

fail_begin_load:
		fclose (f);

                if (success) {
                        /* If there was no error, there must be an animation that was successfully loaded */
                        g_assert (animation);
                } else {
                        if (animation) {
                                g_object_unref (animation);
                                animation = NULL;
                        }
                }
	} else {
		GdkPixbuf *pixbuf;

		/* Keep this logic in sync with gdk_pixbuf_new_from_file() */

		fseek (f, 0, SEEK_SET);
		pixbuf = _gdk_pixbuf_generic_image_load (image_module, f, error);
		fclose (f);

                if (pixbuf == NULL && error != NULL && *error == NULL) {
                        /* I don't trust these crufty longjmp()'ing image libs
                         * to maintain proper error invariants, and I don't
                         * want user code to segfault as a result. We need to maintain
                         * the invariant that error gets set if NULL is returned.
                         */

                        g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.",
                                   image_module->module_name);
                        g_set_error (error,
                                     GDK_PIXBUF_ERROR,
                                     GDK_PIXBUF_ERROR_FAILED,
                                     _("Failed to load image “%s”: reason not known, probably a corrupt image file"),
                                     display_name);
                }

		if (pixbuf == NULL) {
                        g_free (display_name);
                        animation = NULL;
                        goto out;
                }

                animation = gdk_pixbuf_non_anim_new (pixbuf);

                g_object_unref (pixbuf);
	}

        g_free (display_name);

 out:
	return animation;
}

#ifdef G_OS_WIN32
/**
 * gdk_pixbuf_animation_new_from_file_utf8:
 * @filename: (type filename): Name of file to load, in the GLib file name encoding
 * @error: return location for error
 *
 * Same as gdk_pixbuf_animation_new_from_file()
 *
 * Return value: A newly-created animation with a reference count of 1, or %NULL
 * if any of several error conditions ocurred:  the file could not be opened,
 * there was no loader for the file's format, there was not enough memory to
 * allocate the image buffer, or the image file contained invalid data.
 */
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_file_utf8 (const gchar  *filename,
                                         GError      **error)
{
    return gdk_pixbuf_animation_new_from_file (filename, error);
}
#endif

/**
 * gdk_pixbuf_animation_new_from_stream:
 * @stream:  a #GInputStream to load the pixbuf from
 * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
 * @error: Return location for an error
 *
 * Creates a new animation by loading it from an input stream.
 *
 * The file format is detected automatically. If %NULL is returned, then
 * @error will be set. The @cancellable can be used to abort the operation
 * from another thread. If the operation was cancelled, the error
 * %G_IO_ERROR_CANCELLED will be returned. Other possible errors are in
 * the #GDK_PIXBUF_ERROR and %G_IO_ERROR domains.
 *
 * The stream is not closed.
 *
 * Return value: A newly-created pixbuf, or %NULL if any of several error
 * conditions occurred: the file could not be opened, the image format is
 * not supported, there was not enough memory to allocate the image buffer,
 * the stream contained invalid data, or the operation was cancelled.
 *
 * Since: 2.28
 */
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_stream (GInputStream  *stream,
                                      GCancellable  *cancellable,
                                      GError       **error)
{
        GdkPixbufAnimation *animation;
        GdkPixbufLoader *loader;
        gssize n_read;
        guchar buffer[LOAD_BUFFER_SIZE];
        gboolean res;

        g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
        g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
        g_return_val_if_fail (error == NULL || *error == NULL, NULL);

        loader = gdk_pixbuf_loader_new ();

        res = TRUE;
        while (1) {
                n_read = g_input_stream_read (stream, buffer, sizeof (buffer), cancellable, error);
                if (n_read < 0) {
                        res = FALSE;
                        error = NULL; /* Ignore further errors */
                        break;
                }

                if (n_read == 0)
                        break;

                if (!gdk_pixbuf_loader_write (loader, buffer, n_read, error)) {
                        res = FALSE;
                        error = NULL;
                        break;
                }
        }

        if (!gdk_pixbuf_loader_close (loader, error)) {
                res = FALSE;
                error = NULL;
        }

        if (res) {
                animation = gdk_pixbuf_loader_get_animation (loader);
                if (animation)
                        g_object_ref (animation);
        } else {
                animation = NULL;
        }

        g_object_unref (loader);

        return animation;
}

static void
animation_new_from_stream_thread (GTask        *task,
                                  gpointer      source_object,
                                  gpointer      task_data,
                                  GCancellable *cancellable)
{
        GInputStream *stream = G_INPUT_STREAM (source_object);
	GdkPixbufAnimation *animation;
	GError *error = NULL;

	animation = gdk_pixbuf_animation_new_from_stream (stream, cancellable, &error);

	/* Set the new pixbuf as the result, or error out */
	if (animation == NULL) {
                g_task_return_error (task, error);
	} else {
                g_task_return_pointer (task, animation, g_object_unref);
	}
}

/**
 * gdk_pixbuf_animation_new_from_stream_async:
 * @stream: a #GInputStream from which to load the animation
 * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
 * @callback: a #GAsyncReadyCallback to call when the pixbuf is loaded
 * @user_data: the data to pass to the callback function
 *
 * Creates a new animation by asynchronously loading an image from an input stream.
 *
 * For more details see gdk_pixbuf_new_from_stream(), which is the synchronous
 * version of this function.
 *
 * When the operation is finished, @callback will be called in the main thread.
 * You can then call gdk_pixbuf_animation_new_from_stream_finish() to get the
 * result of the operation.
 *
 * Since: 2.28
 **/
void
gdk_pixbuf_animation_new_from_stream_async (GInputStream        *stream,
                                            GCancellable        *cancellable,
                                            GAsyncReadyCallback  callback,
                                            gpointer             user_data)
{
	GTask *task;

	g_return_if_fail (G_IS_INPUT_STREAM (stream));
	g_return_if_fail (callback != NULL);
	g_return_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable));

	task = g_task_new (G_OBJECT (stream), cancellable, callback, user_data);
        g_task_set_source_tag (task, gdk_pixbuf_animation_new_from_stream_async);
	g_task_run_in_thread (task, animation_new_from_stream_thread);
	g_object_unref (task);
}

/**
 * gdk_pixbuf_animation_new_from_stream_finish:
 * @async_result: a #GAsyncResult
 * @error: a #GError, or %NULL
 *
 * Finishes an asynchronous pixbuf animation creation operation started with
 * gdk_pixbuf_animation_new_from_stream_async().
 *
 * Return value: a #GdkPixbufAnimation or %NULL on error. Free the returned
 * object with g_object_unref().
 *
 * Since: 2.28
 **/
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_stream_finish (GAsyncResult  *async_result,
			              	     GError       **error)
{
        GTask *task = G_TASK (async_result);

	g_return_val_if_fail (G_IS_TASK (async_result), NULL);
	g_return_val_if_fail (!error || (error && !*error), NULL);
	g_warn_if_fail (g_task_get_source_tag (task) == gdk_pixbuf_animation_new_from_stream_async);

	return g_task_propagate_pointer (task, error);
}

/**
 * gdk_pixbuf_animation_new_from_resource:
 * @resource_path: the path of the resource file
 * @error: Return location for an error
 *
 * Creates a new pixbuf animation by loading an image from an resource.
 *
 * The file format is detected automatically. If %NULL is returned, then
 * @error will be set.
 *
 * Return value: A newly-created animation, or %NULL if any of several error
 * conditions occurred: the file could not be opened, the image format is
 * not supported, there was not enough memory to allocate the image buffer,
 * the stream contained invalid data, or the operation was cancelled.
 *
 * Since: 2.28
 */
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_resource (const gchar  *resource_path,
                                        GError      **error)
{
	GInputStream *stream;
	GdkPixbufAnimation *anim;
	GdkPixbuf *pixbuf;

        pixbuf = _gdk_pixbuf_new_from_resource_try_pixdata (resource_path);
        if (pixbuf) {
                anim = gdk_pixbuf_non_anim_new (pixbuf);
                g_object_unref (pixbuf);
                return anim;
        }

	stream = g_resources_open_stream (resource_path, 0, error);
	if (stream == NULL)
		return NULL;

	anim = gdk_pixbuf_animation_new_from_stream (stream, NULL, error);
	g_object_unref (stream);
	return anim;
}

/**
 * gdk_pixbuf_animation_ref: (skip)
 * @animation: An animation.
 *
 * Adds a reference to an animation.
 *
 * Return value: The same as the @animation argument.
 *
 * Deprecated: 2.0: Use g_object_ref().
 */
GdkPixbufAnimation *
gdk_pixbuf_animation_ref (GdkPixbufAnimation *animation)
{
        return (GdkPixbufAnimation*) g_object_ref (animation);
}

/**
 * gdk_pixbuf_animation_unref: (skip)
 * @animation: An animation.
 *
 * Removes a reference from an animation.
 *
 * Deprecated: 2.0: Use g_object_unref().
 */
void
gdk_pixbuf_animation_unref (GdkPixbufAnimation *animation)
{
        g_object_unref (animation);
}

/**
 * gdk_pixbuf_animation_is_static_image:
 * @animation: a #GdkPixbufAnimation
 *
 * If you load a file with gdk_pixbuf_animation_new_from_file() and it
 * turns out to be a plain, unanimated image, then this function will
 * return %TRUE. Use gdk_pixbuf_animation_get_static_image() to retrieve
 * the image.
 *
 * Return value: %TRUE if the "animation" was really just an image
 */
gboolean
gdk_pixbuf_animation_is_static_image (GdkPixbufAnimation *animation)
{
	g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), FALSE);

        return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->is_static_image (animation);
}

/**
 * gdk_pixbuf_animation_get_static_image:
 * @animation: a #GdkPixbufAnimation
 *
 * If an animation is really just a plain image (has only one frame),
 * this function returns that image. If the animation is an animation,
 * this function returns a reasonable thing to display as a static
 * unanimated image, which might be the first frame, or something more
 * sophisticated. If an animation hasn't loaded any frames yet, this
 * function will return %NULL.
 *
 * Return value: (transfer none): unanimated image representing the animation
 */
GdkPixbuf*
gdk_pixbuf_animation_get_static_image (GdkPixbufAnimation *animation)
{
	g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), NULL);

        return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_static_image (animation);
}

/**
 * gdk_pixbuf_animation_get_width:
 * @animation: An animation.
 *
 * Queries the width of the bounding box of a pixbuf animation.
 *
 * Return value: Width of the bounding box of the animation.
 */
gint
gdk_pixbuf_animation_get_width (GdkPixbufAnimation *animation)
{
        gint width;

	g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), 0);

        width = 0;
        GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_size (animation,
                                                              &width, NULL);

	return width;
}

/**
 * gdk_pixbuf_animation_get_height:
 * @animation: An animation.
 *
 * Queries the height of the bounding box of a pixbuf animation.
 *
 * Return value: Height of the bounding box of the animation.
 */
gint
gdk_pixbuf_animation_get_height (GdkPixbufAnimation *animation)
{
        gint height;

	g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), 0);

        height = 0;
        GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_size (animation,
                                                              NULL, &height);

	return height;
}


/**
 * gdk_pixbuf_animation_get_iter:
 * @animation: a #GdkPixbufAnimation
 * @start_time: (allow-none): time when the animation starts playing
 *
 * Get an iterator for displaying an animation. The iterator provides
 * the frames that should be displayed at a given time. It should be
 * freed after use with g_object_unref().
 *
 * @start_time would normally come from g_get_current_time(), and marks
 * the beginning of animation playback. After creating an iterator, you
 * should immediately display the pixbuf returned by
 * gdk_pixbuf_animation_iter_get_pixbuf(). Then, you should install
 * a timeout (with g_timeout_add()) or by some other mechanism ensure
 * that you'll update the image after
 * gdk_pixbuf_animation_iter_get_delay_time() milliseconds. Each time
 * the image is updated, you should reinstall the timeout with the new,
 * possibly-changed delay time.
 *
 * As a shortcut, if @start_time is %NULL, the result of
 * g_get_current_time() will be used automatically.
 *
 * To update the image (i.e. possibly change the result of
 * gdk_pixbuf_animation_iter_get_pixbuf() to a new frame of the animation),
 * call gdk_pixbuf_animation_iter_advance().
 *
 * If you're using #GdkPixbufLoader, in addition to updating the image
 * after the delay time, you should also update it whenever you
 * receive the area_updated signal and
 * gdk_pixbuf_animation_iter_on_currently_loading_frame() returns
 * %TRUE. In this case, the frame currently being fed into the loader
 * has received new data, so needs to be refreshed. The delay time for
 * a frame may also be modified after an area_updated signal, for
 * example if the delay time for a frame is encoded in the data after
 * the frame itself. So your timeout should be reinstalled after any
 * area_updated signal.
 *
 * A delay time of -1 is possible, indicating "infinite."
 *
 * Return value: (transfer full): an iterator to move over the animation
 */
GdkPixbufAnimationIter*
gdk_pixbuf_animation_get_iter (GdkPixbufAnimation *animation,
                               const GTimeVal     *start_time)
{
        GTimeVal val;

        g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), NULL);


        if (start_time)
                val = *start_time;
        else
                g_get_current_time (&val);

        return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_iter (animation, &val);
}

G_DEFINE_TYPE (GdkPixbufAnimationIter, gdk_pixbuf_animation_iter, G_TYPE_OBJECT);

static void
gdk_pixbuf_animation_iter_class_init (GdkPixbufAnimationIterClass *klass)
{
}

static void
gdk_pixbuf_animation_iter_init (GdkPixbufAnimationIter *iter)
{
}

/**
 * gdk_pixbuf_animation_iter_get_delay_time:
 * @iter: an animation iterator
 *
 * Gets the number of milliseconds the current pixbuf should be displayed,
 * or -1 if the current pixbuf should be displayed forever. g_timeout_add()
 * conveniently takes a timeout in milliseconds, so you can use a timeout
 * to schedule the next update.
 *
 * Note that some formats, like GIF, might clamp the timeout values in the
 * image file to avoid updates that are just too quick. The minimum timeout
 * for GIF images is currently 20 milliseconds.
 *
 * Return value: delay time in milliseconds (thousandths of a second)
 */
gint
gdk_pixbuf_animation_iter_get_delay_time (GdkPixbufAnimationIter *iter)
{
        g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), -1);
        g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_delay_time, -1);

        return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_delay_time (iter);
}

/**
 * gdk_pixbuf_animation_iter_get_pixbuf:
 * @iter: an animation iterator
 *
 * Gets the current pixbuf which should be displayed; the pixbuf might not
 * be the same size as the animation itself
 * (gdk_pixbuf_animation_get_width(), gdk_pixbuf_animation_get_height()).
 * This pixbuf should be displayed for
 * gdk_pixbuf_animation_iter_get_delay_time() milliseconds. The caller
 * of this function does not own a reference to the returned pixbuf;
 * the returned pixbuf will become invalid when the iterator advances
 * to the next frame, which may happen anytime you call
 * gdk_pixbuf_animation_iter_advance(). Copy the pixbuf to keep it
 * (don't just add a reference), as it may get recycled as you advance
 * the iterator.
 *
 * Return value: (transfer none): the pixbuf to be displayed
 */
GdkPixbuf*
gdk_pixbuf_animation_iter_get_pixbuf (GdkPixbufAnimationIter *iter)
{
        g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), NULL);
        g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_pixbuf, NULL);

        return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_pixbuf (iter);
}

/**
 * gdk_pixbuf_animation_iter_on_currently_loading_frame:
 * @iter: a #GdkPixbufAnimationIter
 *
 * Used to determine how to respond to the area_updated signal on
 * #GdkPixbufLoader when loading an animation. area_updated is emitted
 * for an area of the frame currently streaming in to the loader. So if
 * you're on the currently loading frame, you need to redraw the screen for
 * the updated area.
 *
 * Return value: %TRUE if the frame we're on is partially loaded, or the last frame
 */
gboolean
gdk_pixbuf_animation_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter)
{
        g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), FALSE);
        g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->on_currently_loading_frame, FALSE);

        return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->on_currently_loading_frame (iter);
}

/**
 * gdk_pixbuf_animation_iter_advance:
 * @iter: a #GdkPixbufAnimationIter
 * @current_time: (allow-none): current time
 *
 * Possibly advances an animation to a new frame. Chooses the frame based
 * on the start time passed to gdk_pixbuf_animation_get_iter().
 *
 * @current_time would normally come from g_get_current_time(), and
 * must be greater than or equal to the time passed to
 * gdk_pixbuf_animation_get_iter(), and must increase or remain
 * unchanged each time gdk_pixbuf_animation_iter_get_pixbuf() is
 * called. That is, you can't go backward in time; animations only
 * play forward.
 *
 * As a shortcut, pass %NULL for the current time and g_get_current_time()
 * will be invoked on your behalf. So you only need to explicitly pass
 * @current_time if you're doing something odd like playing the animation
 * at double speed.
 *
 * If this function returns %FALSE, there's no need to update the animation
 * display, assuming the display had been rendered prior to advancing;
 * if %TRUE, you need to call gdk_pixbuf_animation_iter_get_pixbuf()
 * and update the display with the new pixbuf.
 *
 * Returns: %TRUE if the image may need updating
 */
gboolean
gdk_pixbuf_animation_iter_advance (GdkPixbufAnimationIter *iter,
                                   const GTimeVal         *current_time)
{
        GTimeVal val;

        g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), FALSE);
        g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->advance, FALSE);

        if (current_time)
                val = *current_time;
        else
                g_get_current_time (&val);

        return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->advance (iter, &val);
}

static void                    gdk_pixbuf_non_anim_finalize         (GObject            *object);
static gboolean                gdk_pixbuf_non_anim_is_static_image  (GdkPixbufAnimation *animation);
static GdkPixbuf*              gdk_pixbuf_non_anim_get_static_image (GdkPixbufAnimation *animation);
static void                    gdk_pixbuf_non_anim_get_size         (GdkPixbufAnimation *anim,
                                                                     gint               *width,
                                                                     gint               *height);
static GdkPixbufAnimationIter* gdk_pixbuf_non_anim_get_iter         (GdkPixbufAnimation *anim,
                                                                     const GTimeVal     *start_time);

G_DEFINE_TYPE (GdkPixbufNonAnim, gdk_pixbuf_non_anim, GDK_TYPE_PIXBUF_ANIMATION);

static void
gdk_pixbuf_non_anim_class_init (GdkPixbufNonAnimClass *klass)
{
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
        GdkPixbufAnimationClass *anim_class = GDK_PIXBUF_ANIMATION_CLASS (klass);

        object_class->finalize = gdk_pixbuf_non_anim_finalize;

        anim_class->is_static_image = gdk_pixbuf_non_anim_is_static_image;
        anim_class->get_static_image = gdk_pixbuf_non_anim_get_static_image;
        anim_class->get_size = gdk_pixbuf_non_anim_get_size;
        anim_class->get_iter = gdk_pixbuf_non_anim_get_iter;
}

static void
gdk_pixbuf_non_anim_init (GdkPixbufNonAnim *non_anim)
{
}

static void
gdk_pixbuf_non_anim_finalize (GObject *object)
{
        GdkPixbufNonAnim *non_anim = GDK_PIXBUF_NON_ANIM (object);

        if (non_anim->pixbuf)
                g_object_unref (non_anim->pixbuf);

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

GdkPixbufAnimation*
gdk_pixbuf_non_anim_new (GdkPixbuf *pixbuf)
{
        GdkPixbufNonAnim *non_anim;

        non_anim = g_object_new (GDK_TYPE_PIXBUF_NON_ANIM, NULL);

        non_anim->pixbuf = pixbuf;

        if (pixbuf)
                g_object_ref (pixbuf);

        return GDK_PIXBUF_ANIMATION (non_anim);
}

static gboolean
gdk_pixbuf_non_anim_is_static_image (GdkPixbufAnimation *animation)
{

        return TRUE;
}

static GdkPixbuf*
gdk_pixbuf_non_anim_get_static_image (GdkPixbufAnimation *animation)
{
        GdkPixbufNonAnim *non_anim;

        non_anim = GDK_PIXBUF_NON_ANIM (animation);

        return non_anim->pixbuf;
}

static void
gdk_pixbuf_non_anim_get_size (GdkPixbufAnimation *anim,
                              gint               *width,
                              gint               *height)
{
        GdkPixbufNonAnim *non_anim;

        non_anim = GDK_PIXBUF_NON_ANIM (anim);

        if (width)
                *width = gdk_pixbuf_get_width (non_anim->pixbuf);

        if (height)
                *height = gdk_pixbuf_get_height (non_anim->pixbuf);
}

static GdkPixbufAnimationIter*
gdk_pixbuf_non_anim_get_iter (GdkPixbufAnimation *anim,
                              const GTimeVal     *start_time)
{
        GdkPixbufNonAnimIter *iter;

        iter = g_object_new (GDK_TYPE_PIXBUF_NON_ANIM_ITER, NULL);

        iter->non_anim = GDK_PIXBUF_NON_ANIM (anim);

        g_object_ref (iter->non_anim);

        return GDK_PIXBUF_ANIMATION_ITER (iter);
}

static void       gdk_pixbuf_non_anim_iter_finalize                   (GObject                *object);
static gint       gdk_pixbuf_non_anim_iter_get_delay_time             (GdkPixbufAnimationIter *iter);
static GdkPixbuf* gdk_pixbuf_non_anim_iter_get_pixbuf                 (GdkPixbufAnimationIter *iter);
static gboolean   gdk_pixbuf_non_anim_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter);
static gboolean   gdk_pixbuf_non_anim_iter_advance                    (GdkPixbufAnimationIter *iter,
                                                                       const GTimeVal         *current_time);

G_DEFINE_TYPE (GdkPixbufNonAnimIter, gdk_pixbuf_non_anim_iter, GDK_TYPE_PIXBUF_ANIMATION_ITER)

static void
gdk_pixbuf_non_anim_iter_class_init (GdkPixbufNonAnimIterClass *klass)
{
        GObjectClass *object_class = G_OBJECT_CLASS (klass);
        GdkPixbufAnimationIterClass *anim_iter_class =
                GDK_PIXBUF_ANIMATION_ITER_CLASS (klass);

        object_class->finalize = gdk_pixbuf_non_anim_iter_finalize;

        anim_iter_class->get_delay_time = gdk_pixbuf_non_anim_iter_get_delay_time;
        anim_iter_class->get_pixbuf = gdk_pixbuf_non_anim_iter_get_pixbuf;
        anim_iter_class->on_currently_loading_frame = gdk_pixbuf_non_anim_iter_on_currently_loading_frame;
        anim_iter_class->advance = gdk_pixbuf_non_anim_iter_advance;
}

static void
gdk_pixbuf_non_anim_iter_init (GdkPixbufNonAnimIter *non_iter)
{
}

static void
gdk_pixbuf_non_anim_iter_finalize (GObject *object)
{
        GdkPixbufNonAnimIter *iter = GDK_PIXBUF_NON_ANIM_ITER (object);

        g_object_unref (iter->non_anim);

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

static gint
gdk_pixbuf_non_anim_iter_get_delay_time (GdkPixbufAnimationIter *iter)
{
        return -1; /* show only frame forever */
}

static GdkPixbuf*
gdk_pixbuf_non_anim_iter_get_pixbuf (GdkPixbufAnimationIter *iter)
{
        return GDK_PIXBUF_NON_ANIM_ITER (iter)->non_anim->pixbuf;
}


static gboolean
gdk_pixbuf_non_anim_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter)
{
        return TRUE;
}

static gboolean
gdk_pixbuf_non_anim_iter_advance (GdkPixbufAnimationIter *iter,
                                  const GTimeVal         *current_time)
{

        /* Advancing never requires a refresh */
        return FALSE;
}