summaryrefslogtreecommitdiff
path: root/gdk/gdkoffscreenwindow.c
blob: 5ee179f86d9c2881b6262a497fe03e8cbfa5897e (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
/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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/>.
 */

/*
 * Modified by the GTK+ Team and others 1997-2005.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
 */

#include "config.h"

#include "gdkwindow.h"
#include "gdkinternals.h"
#include "gdkwindowimpl.h"

#include <math.h>

#include "fallback-c89.c"

/* LIMITATIONS:
 *
 * Offscreen windows can’t be the child of a foreign window,
 *   nor contain foreign windows
 * GDK_POINTER_MOTION_HINT_MASK isn't effective
 */

typedef struct _GdkOffscreenWindow      GdkOffscreenWindow;
typedef struct _GdkOffscreenWindowClass GdkOffscreenWindowClass;

struct _GdkOffscreenWindow
{
  GdkWindowImpl parent_instance;

  GdkWindow *wrapper;

  cairo_surface_t *surface;
  GdkWindow *embedder;
};

struct _GdkOffscreenWindowClass
{
  GdkWindowImplClass parent_class;
};

#define GDK_TYPE_OFFSCREEN_WINDOW            (gdk_offscreen_window_get_type())
#define GDK_OFFSCREEN_WINDOW(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindow))
#define GDK_IS_OFFSCREEN_WINDOW(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_OFFSCREEN_WINDOW))
#define GDK_OFFSCREEN_WINDOW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))
#define GDK_IS_OFFSCREEN_WINDOW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_OFFSCREEN_WINDOW))
#define GDK_OFFSCREEN_WINDOW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))

static void       gdk_offscreen_window_hide               (GdkWindow                  *window);

G_DEFINE_TYPE (GdkOffscreenWindow, gdk_offscreen_window, GDK_TYPE_WINDOW_IMPL)


static void
gdk_offscreen_window_finalize (GObject *object)
{
  GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (object);

  if (offscreen->surface)
    cairo_surface_destroy (offscreen->surface);

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

static void
gdk_offscreen_window_init (GdkOffscreenWindow *window)
{
}

static void
gdk_offscreen_window_destroy (GdkWindow *window,
                              gboolean   recursing,
                              gboolean   foreign_destroy)
{
  gdk_offscreen_window_set_embedder (window, NULL);

  if (!recursing)
    gdk_offscreen_window_hide (window);
}

static cairo_surface_t *
get_surface (GdkOffscreenWindow *offscreen)
{
  if (! offscreen->surface)
    {
      GdkWindow *window = offscreen->wrapper;

      g_signal_emit_by_name (window, "create-surface",
                             window->width,
                             window->height,
                             &offscreen->surface);
    }

  return offscreen->surface;
}

static gboolean
is_parent_of (GdkWindow *parent,
	      GdkWindow *child)
{
  GdkWindow *w;

  w = child;
  while (w != NULL)
    {
      if (w == parent)
	return TRUE;

      w = gdk_window_get_parent (w);
    }

  return FALSE;
}

static cairo_surface_t *
gdk_offscreen_window_ref_cairo_surface (GdkWindow *window)
{
  GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  return cairo_surface_reference (get_surface (offscreen));
}

cairo_surface_t *
_gdk_offscreen_window_create_surface (GdkWindow *offscreen,
                                      gint       width,
                                      gint       height)
{
  g_return_val_if_fail (GDK_IS_OFFSCREEN_WINDOW (offscreen->impl), NULL);

  return gdk_window_create_similar_surface (offscreen->parent,
					    CAIRO_CONTENT_COLOR_ALPHA, 
					    width, height);
}

void
_gdk_offscreen_window_new (GdkWindow     *window,
			   GdkWindowAttr *attributes,
			   gint           attributes_mask)
{
  GdkOffscreenWindow *offscreen;

  g_return_if_fail (attributes != NULL);

  if (attributes->wclass != GDK_INPUT_OUTPUT)
    return; /* Can't support input only offscreens */

  if (window->parent != NULL && GDK_WINDOW_DESTROYED (window->parent))
    return;

  window->impl = g_object_new (GDK_TYPE_OFFSCREEN_WINDOW, NULL);
  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);
  offscreen->wrapper = window;
}

static gboolean
gdk_offscreen_window_reparent (GdkWindow *window,
			       GdkWindow *new_parent,
			       gint       x,
			       gint       y)
{
  GdkWindow *old_parent;
  gboolean was_mapped;

  if (new_parent)
    {
      /* No input-output children of input-only windows */
      if (new_parent->input_only && !window->input_only)
	return FALSE;

      /* Don't create loops in hierarchy */
      if (is_parent_of (window, new_parent))
	return FALSE;
    }

  was_mapped = GDK_WINDOW_IS_MAPPED (window);

  gdk_window_hide (window);

  if (window->parent)
    window->parent->children = g_list_remove (window->parent->children, window);

  old_parent = window->parent;
  window->parent = new_parent;
  window->x = x;
  window->y = y;

  if (new_parent)
    window->parent->children = g_list_prepend (window->parent->children, window);

  _gdk_synthesize_crossing_events_for_geometry_change (window);
  if (old_parent)
    _gdk_synthesize_crossing_events_for_geometry_change (old_parent);

  return was_mapped;
}

static void
gdk_offscreen_window_set_device_cursor (GdkWindow     *window,
					GdkDevice     *device,
					GdkCursor     *cursor)
{
}

static void
from_embedder (GdkWindow *window,
	       double embedder_x, double embedder_y,
	       double *offscreen_x, double *offscreen_y)
{
  g_signal_emit_by_name (window->impl_window,
			 "from-embedder",
			 embedder_x, embedder_y,
			 offscreen_x, offscreen_y,
			 NULL);
}

static void
to_embedder (GdkWindow *window,
	     double offscreen_x, double offscreen_y,
	     double *embedder_x, double *embedder_y)
{
  g_signal_emit_by_name (window->impl_window,
			 "to-embedder",
			 offscreen_x, offscreen_y,
			 embedder_x, embedder_y,
			 NULL);
}

static void
gdk_offscreen_window_get_root_coords (GdkWindow *window,
				      gint       x,
				      gint       y,
				      gint      *root_x,
				      gint      *root_y)
{
  GdkOffscreenWindow *offscreen;
  int tmpx, tmpy;

  tmpx = x;
  tmpy = y;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);
  if (offscreen->embedder)
    {
      double dx, dy;
      to_embedder (window,
		   x, y,
		   &dx, &dy);
      tmpx = floor (dx + 0.5);
      tmpy = floor (dy + 0.5);
      gdk_window_get_root_coords (offscreen->embedder,
				  tmpx, tmpy,
				  &tmpx, &tmpy);

    }

  if (root_x)
    *root_x = tmpx;
  if (root_y)
    *root_y = tmpy;
}

static gboolean
gdk_offscreen_window_get_device_state (GdkWindow       *window,
                                       GdkDevice       *device,
                                       gdouble         *x,
                                       gdouble         *y,
                                       GdkModifierType *mask)
{
  GdkOffscreenWindow *offscreen;
  double tmpx, tmpy;
  double dtmpx, dtmpy;
  GdkModifierType tmpmask;

  tmpx = 0;
  tmpy = 0;
  tmpmask = 0;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);
  if (offscreen->embedder != NULL)
    {
      gdk_window_get_device_position_double (offscreen->embedder, device, &tmpx, &tmpy, &tmpmask);
      from_embedder (window,
		     tmpx, tmpy,
		     &dtmpx, &dtmpy);
      tmpx = dtmpx;
      tmpy = dtmpy;
    }

  if (x)
    *x = round (tmpx);
  if (y)
    *y = round (tmpy);
  if (mask)
    *mask = tmpmask;
  return TRUE;
}

/**
 * gdk_offscreen_window_get_surface:
 * @window: a #GdkWindow
 *
 * Gets the offscreen surface that an offscreen window renders into.
 * If you need to keep this around over window resizes, you need to
 * add a reference to it.
 *
 * Returns: (nullable) (transfer none): The offscreen surface, or
 *   %NULL if not offscreen
 */
cairo_surface_t *
gdk_offscreen_window_get_surface (GdkWindow *window)
{
  GdkOffscreenWindow *offscreen;

  g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);

  if (!GDK_IS_OFFSCREEN_WINDOW (window->impl))
    return NULL;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  return get_surface (offscreen);
}

static void
gdk_offscreen_window_raise (GdkWindow *window)
{
  /* gdk_window_raise already changed the stacking order */
  _gdk_synthesize_crossing_events_for_geometry_change (window);
}

static void
gdk_offscreen_window_lower (GdkWindow *window)
{
  /* gdk_window_lower already changed the stacking order */
  _gdk_synthesize_crossing_events_for_geometry_change (window);
}

static void
gdk_offscreen_window_move_resize_internal (GdkWindow *window,
                                           gint       x,
                                           gint       y,
                                           gint       width,
                                           gint       height,
                                           gboolean   send_expose_events)
{
  GdkOffscreenWindow *offscreen;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  if (width < 1)
    width = 1;
  if (height < 1)
    height = 1;

  if (window->destroyed)
    return;

  window->x = x;
  window->y = y;

  if (window->width != width ||
      window->height != height)
    {
      window->width = width;
      window->height = height;

      if (offscreen->surface)
        {
          cairo_surface_t *old_surface;
          cairo_t *cr;

          old_surface = offscreen->surface;
          offscreen->surface = NULL;

          offscreen->surface = get_surface (offscreen);

          cr = cairo_create (offscreen->surface);
          cairo_set_source_surface (cr, old_surface, 0, 0);
          cairo_paint (cr);
          cairo_destroy (cr);

          cairo_surface_destroy (old_surface);
        }
    }

  if (GDK_WINDOW_IS_MAPPED (window))
    {
      /* TODO: Only invalidate new area, i.e. for larger windows */
      gdk_window_invalidate_rect (window, NULL, TRUE);
      _gdk_synthesize_crossing_events_for_geometry_change (window);
    }
}

static void
gdk_offscreen_window_move_resize (GdkWindow *window,
                                  gboolean   with_move,
                                  gint       x,
                                  gint       y,
                                  gint       width,
                                  gint       height)
{
  if (!with_move)
    {
      x = window->x;
      y = window->y;
    }

  if (width < 0)
    width = window->width;

  if (height < 0)
    height = window->height;

  gdk_offscreen_window_move_resize_internal (window,
                                             x, y, width, height,
                                             TRUE);
}

static void
gdk_offscreen_window_show (GdkWindow *window,
			   gboolean already_mapped)
{
  GdkRectangle area = { 0, 0, window->width, window->height };

  gdk_window_invalidate_rect (window, &area, FALSE);
}


static void
gdk_offscreen_window_hide (GdkWindow *window)
{
  /* TODO: This needs updating to the new grab world */
#if 0
  GdkOffscreenWindow *offscreen;
  GdkDisplay *display;

  g_return_if_fail (window != NULL);

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  /* May need to break grabs on children */
  display = gdk_window_get_display (window);

  if (display->pointer_grab.window != NULL)
    {
      if (is_parent_of (window, display->pointer_grab.window))
	{
	  /* Call this ourselves, even though gdk_display_pointer_ungrab
	     does so too, since we want to pass implicit == TRUE so the
	     broken grab event is generated */
	  _gdk_display_unset_has_pointer_grab (display,
					       TRUE,
					       FALSE,
					       GDK_CURRENT_TIME);
	  gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME);
	}
    }
#endif
}

static void
gdk_offscreen_window_withdraw (GdkWindow *window)
{
}

static GdkEventMask
gdk_offscreen_window_get_events (GdkWindow *window)
{
  return 0;
}

static void
gdk_offscreen_window_set_events (GdkWindow       *window,
				 GdkEventMask     event_mask)
{
}

static void
gdk_offscreen_window_set_background (GdkWindow      *window,
				     cairo_pattern_t *pattern)
{
}

static void
gdk_offscreen_window_shape_combine_region (GdkWindow       *window,
					   const cairo_region_t *shape_region,
					   gint             offset_x,
					   gint             offset_y)
{
}

static void
gdk_offscreen_window_input_shape_combine_region (GdkWindow       *window,
						 const cairo_region_t *shape_region,
						 gint             offset_x,
						 gint             offset_y)
{
}

static gboolean
gdk_offscreen_window_set_static_gravities (GdkWindow *window,
					   gboolean   use_static)
{
  return TRUE;
}

static void
gdk_offscreen_window_get_geometry (GdkWindow *window,
				   gint      *x,
				   gint      *y,
				   gint      *width,
				   gint      *height)
{
  if (!GDK_WINDOW_DESTROYED (window))
    {
      if (x)
	*x = window->x;
      if (y)
	*y = window->y;
      if (width)
	*width = window->width;
      if (height)
	*height = window->height;
    }
}

static gboolean
gdk_offscreen_window_queue_antiexpose (GdkWindow *window,
				       cairo_region_t *area)
{
  return FALSE;
}

/**
 * gdk_offscreen_window_set_embedder:
 * @window: a #GdkWindow
 * @embedder: the #GdkWindow that @window gets embedded in
 *
 * Sets @window to be embedded in @embedder.
 *
 * To fully embed an offscreen window, in addition to calling this
 * function, it is also necessary to handle the #GdkWindow::pick-embedded-child
 * signal on the @embedder and the #GdkWindow::to-embedder and
 * #GdkWindow::from-embedder signals on @window.
 *
 * Since: 2.18
 */
void
gdk_offscreen_window_set_embedder (GdkWindow     *window,
				   GdkWindow     *embedder)
{
  GdkOffscreenWindow *offscreen;

  g_return_if_fail (GDK_IS_WINDOW (window));

  if (!GDK_IS_OFFSCREEN_WINDOW (window->impl))
    return;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  if (embedder)
    {
      g_object_ref (embedder);
      embedder->num_offscreen_children++;
    }

  if (offscreen->embedder)
    {
      g_object_unref (offscreen->embedder);
      offscreen->embedder->num_offscreen_children--;
    }

  offscreen->embedder = embedder;
}

/**
 * gdk_offscreen_window_get_embedder:
 * @window: a #GdkWindow
 *
 * Gets the window that @window is embedded in.
 *
 * Returns: (nullable) (transfer none): the embedding #GdkWindow, or
 *     %NULL if @window is not an mbedded offscreen window
 *
 * Since: 2.18
 */
GdkWindow *
gdk_offscreen_window_get_embedder (GdkWindow *window)
{
  GdkOffscreenWindow *offscreen;

  g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);

  if (!GDK_IS_OFFSCREEN_WINDOW (window->impl))
    return NULL;

  offscreen = GDK_OFFSCREEN_WINDOW (window->impl);

  return offscreen->embedder;
}

static void
gdk_offscreen_window_do_nothing (GdkWindow *window)
{
}

static void
gdk_offscreen_window_set_boolean (GdkWindow *window,
                                  gboolean   setting)
{
}

static void
gdk_offscreen_window_set_string (GdkWindow *window,
				 const gchar *setting)
{
}

static void
gdk_offscreen_window_set_list (GdkWindow *window,
                               GList *list)
{
}

static void
gdk_offscreen_window_set_wmfunctions (GdkWindow	    *window,
				      GdkWMFunction  functions)
{
}

static void
gdk_offscreen_window_set_transient_for (GdkWindow *window,
					GdkWindow *another)
{
}

static void
gdk_offscreen_window_process_updates_recurse (GdkWindow *window,
                                              cairo_region_t *region)
{
  _gdk_window_process_updates_recurse (window, region);
}

static void
gdk_offscreen_window_get_frame_extents (GdkWindow    *window,
					GdkRectangle *rect)
{
  rect->x = window->x;
  rect->y = window->y;
  rect->width = window->width;
  rect->height = window->height;
}

static gint
gdk_offscreen_window_get_scale_factor (GdkWindow *window)
{

  if (GDK_WINDOW_DESTROYED (window))
    return 1;

  return gdk_window_get_scale_factor (window->parent);
}

static void
gdk_offscreen_window_set_opacity (GdkWindow *window, gdouble opacity)
{
}

static void
gdk_offscreen_window_class_init (GdkOffscreenWindowClass *klass)
{
  GdkWindowImplClass *impl_class = GDK_WINDOW_IMPL_CLASS (klass);
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  object_class->finalize = gdk_offscreen_window_finalize;

  impl_class->ref_cairo_surface = gdk_offscreen_window_ref_cairo_surface;
  impl_class->show = gdk_offscreen_window_show;
  impl_class->hide = gdk_offscreen_window_hide;
  impl_class->withdraw = gdk_offscreen_window_withdraw;
  impl_class->set_events = gdk_offscreen_window_set_events;
  impl_class->get_events = gdk_offscreen_window_get_events;
  impl_class->raise = gdk_offscreen_window_raise;
  impl_class->lower = gdk_offscreen_window_lower;
  impl_class->restack_under = NULL;
  impl_class->restack_toplevel = NULL;
  impl_class->move_resize = gdk_offscreen_window_move_resize;
  impl_class->set_background = gdk_offscreen_window_set_background;
  impl_class->reparent = gdk_offscreen_window_reparent;
  impl_class->set_device_cursor = gdk_offscreen_window_set_device_cursor;
  impl_class->get_geometry = gdk_offscreen_window_get_geometry;
  impl_class->get_root_coords = gdk_offscreen_window_get_root_coords;
  impl_class->get_device_state = gdk_offscreen_window_get_device_state;
  impl_class->shape_combine_region = gdk_offscreen_window_shape_combine_region;
  impl_class->input_shape_combine_region = gdk_offscreen_window_input_shape_combine_region;
  impl_class->set_static_gravities = gdk_offscreen_window_set_static_gravities;
  impl_class->queue_antiexpose = gdk_offscreen_window_queue_antiexpose;
  impl_class->destroy = gdk_offscreen_window_destroy;
  impl_class->destroy_foreign = NULL;
  impl_class->get_shape = NULL;
  impl_class->get_input_shape = NULL;
  impl_class->beep = NULL;

  impl_class->focus = NULL;
  impl_class->set_type_hint = NULL;
  impl_class->get_type_hint = NULL;
  impl_class->set_modal_hint = gdk_offscreen_window_set_boolean;
  impl_class->set_skip_taskbar_hint = gdk_offscreen_window_set_boolean;
  impl_class->set_skip_pager_hint = gdk_offscreen_window_set_boolean;
  impl_class->set_urgency_hint = gdk_offscreen_window_set_boolean;
  impl_class->set_geometry_hints = NULL;
  impl_class->set_title = gdk_offscreen_window_set_string;
  impl_class->set_role = gdk_offscreen_window_set_string;
  impl_class->set_startup_id = gdk_offscreen_window_set_string;
  impl_class->set_transient_for = gdk_offscreen_window_set_transient_for;
  impl_class->get_frame_extents = gdk_offscreen_window_get_frame_extents;
  impl_class->set_override_redirect = NULL;
  impl_class->set_accept_focus = gdk_offscreen_window_set_boolean;
  impl_class->set_focus_on_map = gdk_offscreen_window_set_boolean;
  impl_class->set_icon_list = gdk_offscreen_window_set_list;
  impl_class->set_icon_name = gdk_offscreen_window_set_string;
  impl_class->iconify = gdk_offscreen_window_do_nothing;
  impl_class->deiconify = gdk_offscreen_window_do_nothing;
  impl_class->stick = gdk_offscreen_window_do_nothing;
  impl_class->unstick = gdk_offscreen_window_do_nothing;
  impl_class->maximize = gdk_offscreen_window_do_nothing;
  impl_class->unmaximize = gdk_offscreen_window_do_nothing;
  impl_class->fullscreen = gdk_offscreen_window_do_nothing;
  impl_class->unfullscreen = gdk_offscreen_window_do_nothing;
  impl_class->set_keep_above = gdk_offscreen_window_set_boolean;
  impl_class->set_keep_below = gdk_offscreen_window_set_boolean;
  impl_class->get_group = NULL;
  impl_class->set_group = NULL;
  impl_class->set_decorations = NULL;
  impl_class->get_decorations = NULL;
  impl_class->set_functions = gdk_offscreen_window_set_wmfunctions;
  impl_class->begin_resize_drag = NULL;
  impl_class->begin_move_drag = NULL;
  impl_class->enable_synchronized_configure = gdk_offscreen_window_do_nothing;
  impl_class->configure_finished = NULL;
  impl_class->set_opacity = gdk_offscreen_window_set_opacity;
  impl_class->set_composited = NULL;
  impl_class->destroy_notify = NULL;
  impl_class->register_dnd = gdk_offscreen_window_do_nothing;
  impl_class->drag_begin = NULL;
  impl_class->process_updates_recurse = gdk_offscreen_window_process_updates_recurse;
  impl_class->sync_rendering = NULL;
  impl_class->simulate_key = NULL;
  impl_class->simulate_button = NULL;
  impl_class->get_property = NULL;
  impl_class->change_property = NULL;
  impl_class->delete_property = NULL;
  impl_class->get_scale_factor = gdk_offscreen_window_get_scale_factor;
}