Pileus Git - ~andy/gtk/blob - gdk/gdkoffscreenwindow.c

   1 /* GDK - The GIMP Drawing Kit
   2  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GTK+ Team and others 1997-2005.  See the AUTHORS
  22  * file for a list of people on the GTK+ Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 #include <config.h>
  28 #include <math.h>
  29 #include "gdk.h"
  30 #include "gdkwindow.h"
  31 #include "gdkinternals.h"
  32 #include "gdkwindowimpl.h"
  33 #include "gdkdrawable.h"
  34 #include "gdktypes.h"
  35 #include "gdkscreen.h"
  36 #include "gdkcolor.h"
  37
  38
  39 /* LIMITATIONS:
  40  *
  41  * Offscreen windows can't be the child of a foreign window,
  42  *   nor contain foreign windows
  43  * GDK_POINTER_MOTION_HINT_MASK isn't effective
  44  */
  45
  46 typedef struct _GdkOffscreenWindow      GdkOffscreenWindow;
  47 typedef struct _GdkOffscreenWindowClass GdkOffscreenWindowClass;
  48
  49 struct _GdkOffscreenWindow
  50 {
  51   GdkDrawable parent_instance;
  52
  53   GdkWindow *wrapper;
  54   GdkColormap *colormap;
  55   GdkScreen *screen;
  56
  57   cairo_surface_t *surface;
  58   GdkWindow *embedder;
  59 };
  60
  61 struct _GdkOffscreenWindowClass
  62 {
  63   GdkDrawableClass parent_class;
  64 };
  65
  66 #define GDK_TYPE_OFFSCREEN_WINDOW            (gdk_offscreen_window_get_type())
  67 #define GDK_OFFSCREEN_WINDOW(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindow))
  68 #define GDK_IS_OFFSCREEN_WINDOW(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_OFFSCREEN_WINDOW))
  69 #define GDK_OFFSCREEN_WINDOW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))
  70 #define GDK_IS_OFFSCREEN_WINDOW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_OFFSCREEN_WINDOW))
  71 #define GDK_OFFSCREEN_WINDOW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))
  72
  73 static void       gdk_offscreen_window_impl_iface_init    (GdkWindowImplIface         *iface);
  74 static void       gdk_offscreen_window_hide               (GdkWindow                  *window);
  75
  76 G_DEFINE_TYPE_WITH_CODE (GdkOffscreenWindow,
  77                          gdk_offscreen_window,
  78                          GDK_TYPE_DRAWABLE,
  79                          G_IMPLEMENT_INTERFACE (GDK_TYPE_WINDOW_IMPL,
  80                                                 gdk_offscreen_window_impl_iface_init));
  81
  82
  83 static void
  84 gdk_offscreen_window_finalize (GObject *object)
  85 {
  86   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (object);
  87
  88   cairo_surface_destroy (offscreen->surface);
  89
  90   G_OBJECT_CLASS (gdk_offscreen_window_parent_class)->finalize (object);
  91 }
  92
  93 static void
  94 gdk_offscreen_window_init (GdkOffscreenWindow *window)
  95 {
  96 }
  97
  98 static void
  99 gdk_offscreen_window_destroy (GdkWindow *window,
 100                               gboolean   recursing,
 101                               gboolean   foreign_destroy)
 102 {
 103   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 104   GdkOffscreenWindow *offscreen;
 105
 106   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 107
 108   gdk_offscreen_window_set_embedder (window, NULL);
 109
 110   if (!recursing)
 111     gdk_offscreen_window_hide (window);
 112
 113   g_object_unref (offscreen->colormap);
 114   offscreen->colormap = NULL;
 115 }
 116
 117 static gboolean
 118 is_parent_of (GdkWindow *parent,
 119               GdkWindow *child)
 120 {
 121   GdkWindow *w;
 122
 123   w = child;
 124   while (w != NULL)
 125     {
 126       if (w == parent)
 127         return TRUE;
 128
 129       w = gdk_window_get_parent (w);
 130     }
 131
 132   return FALSE;
 133 }
 134
 135 static cairo_surface_t *
 136 gdk_offscreen_window_ref_cairo_surface (GdkDrawable *drawable)
 137 {
 138   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 139
 140   return cairo_surface_reference (offscreen->surface);
 141 }
 142
 143 static GdkColormap*
 144 gdk_offscreen_window_get_colormap (GdkDrawable *drawable)
 145 {
 146   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 147
 148   return offscreen->colormap;
 149 }
 150
 151 static void
 152 gdk_offscreen_window_set_colormap (GdkDrawable *drawable,
 153                                    GdkColormap*colormap)
 154 {
 155   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 156
 157   if (colormap && GDK_WINDOW_DESTROYED (offscreen->wrapper))
 158     return;
 159
 160   if (offscreen->colormap == colormap)
 161     return;
 162
 163   if (offscreen->colormap)
 164     g_object_unref (offscreen->colormap);
 165
 166   offscreen->colormap = colormap;
 167   if (offscreen->colormap)
 168     g_object_ref (offscreen->colormap);
 169 }
 170
 171
 172 static gint
 173 gdk_offscreen_window_get_depth (GdkDrawable *drawable)
 174 {
 175   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 176
 177   return gdk_drawable_get_depth (offscreen->wrapper);
 178 }
 179
 180 static GdkScreen*
 181 gdk_offscreen_window_get_screen (GdkDrawable *drawable)
 182 {
 183   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 184
 185   return offscreen->screen;
 186 }
 187
 188 static GdkVisual*
 189 gdk_offscreen_window_get_visual (GdkDrawable    *drawable)
 190 {
 191   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 192
 193   return gdk_drawable_get_visual (offscreen->wrapper);
 194 }
 195
 196 void
 197 _gdk_offscreen_window_new (GdkWindow     *window,
 198                            GdkScreen     *screen,
 199                            GdkVisual     *visual,
 200                            GdkWindowAttr *attributes,
 201                            gint           attributes_mask)
 202 {
 203   GdkWindowObject *private;
 204   GdkOffscreenWindow *offscreen;
 205
 206   g_return_if_fail (attributes != NULL);
 207
 208   if (attributes->wclass != GDK_INPUT_OUTPUT)
 209     return; /* Can't support input only offscreens */
 210
 211   private = (GdkWindowObject *)window;
 212
 213   if (private->parent != NULL && GDK_WINDOW_DESTROYED (private->parent))
 214     return;
 215
 216   private->impl = g_object_new (GDK_TYPE_OFFSCREEN_WINDOW, NULL);
 217   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 218   offscreen->wrapper = window;
 219
 220   offscreen->screen = screen;
 221
 222   if (attributes_mask & GDK_WA_COLORMAP)
 223     offscreen->colormap = g_object_ref (attributes->colormap);
 224   else
 225     {
 226       if (gdk_screen_get_system_visual (screen) == visual)
 227         {
 228           offscreen->colormap = gdk_screen_get_system_colormap (screen);
 229           g_object_ref (offscreen->colormap);
 230         }
 231       else
 232         offscreen->colormap = gdk_colormap_new (visual, FALSE);
 233     }
 234
 235   offscreen->surface = gdk_window_create_similar_surface ((GdkWindow *)private->parent,
 236                                                           CAIRO_CONTENT_COLOR,
 237                                                           private->width,
 238                                                           private->height);
 239 }
 240
 241 static gboolean
 242 gdk_offscreen_window_reparent (GdkWindow *window,
 243                                GdkWindow *new_parent,
 244                                gint       x,
 245                                gint       y)
 246 {
 247   GdkWindowObject *private = (GdkWindowObject *)window;
 248   GdkWindowObject *new_parent_private = (GdkWindowObject *)new_parent;
 249   GdkWindowObject *old_parent;
 250   gboolean was_mapped;
 251
 252   if (new_parent)
 253     {
 254       /* No input-output children of input-only windows */
 255       if (new_parent_private->input_only && !private->input_only)
 256         return FALSE;
 257
 258       /* Don't create loops in hierarchy */
 259       if (is_parent_of (window, new_parent))
 260         return FALSE;
 261     }
 262
 263   was_mapped = GDK_WINDOW_IS_MAPPED (window);
 264
 265   gdk_window_hide (window);
 266
 267   if (private->parent)
 268     private->parent->children = g_list_remove (private->parent->children, window);
 269
 270   old_parent = private->parent;
 271   private->parent = new_parent_private;
 272   private->x = x;
 273   private->y = y;
 274
 275   if (new_parent_private)
 276     private->parent->children = g_list_prepend (private->parent->children, window);
 277
 278   _gdk_synthesize_crossing_events_for_geometry_change (window);
 279   if (old_parent)
 280     _gdk_synthesize_crossing_events_for_geometry_change (GDK_WINDOW (old_parent));
 281
 282   return was_mapped;
 283 }
 284
 285 static void
 286 from_embedder (GdkWindow *window,
 287                double embedder_x, double embedder_y,
 288                double *offscreen_x, double *offscreen_y)
 289 {
 290   GdkWindowObject *private;
 291
 292   private = (GdkWindowObject *)window;
 293
 294   g_signal_emit_by_name (private->impl_window,
 295                          "from-embedder",
 296                          embedder_x, embedder_y,
 297                          offscreen_x, offscreen_y,
 298                          NULL);
 299 }
 300
 301 static void
 302 to_embedder (GdkWindow *window,
 303              double offscreen_x, double offscreen_y,
 304              double *embedder_x, double *embedder_y)
 305 {
 306   GdkWindowObject *private;
 307
 308   private = (GdkWindowObject *)window;
 309
 310   g_signal_emit_by_name (private->impl_window,
 311                          "to-embedder",
 312                          offscreen_x, offscreen_y,
 313                          embedder_x, embedder_y,
 314                          NULL);
 315 }
 316
 317 static gint
 318 gdk_offscreen_window_get_root_coords (GdkWindow *window,
 319                                       gint       x,
 320                                       gint       y,
 321                                       gint      *root_x,
 322                                       gint      *root_y)
 323 {
 324   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 325   GdkOffscreenWindow *offscreen;
 326   int tmpx, tmpy;
 327
 328   tmpx = x;
 329   tmpy = y;
 330
 331   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 332   if (offscreen->embedder)
 333     {
 334       double dx, dy;
 335       to_embedder (window,
 336                    x, y,
 337                    &dx, &dy);
 338       tmpx = floor (dx + 0.5);
 339       tmpy = floor (dy + 0.5);
 340       gdk_window_get_root_coords (offscreen->embedder,
 341                                   tmpx, tmpy,
 342                                   &tmpx, &tmpy);
 343
 344     }
 345
 346   if (root_x)
 347     *root_x = tmpx;
 348   if (root_y)
 349     *root_y = tmpy;
 350
 351   return TRUE;
 352 }
 353
 354 static gboolean
 355 gdk_offscreen_window_get_device_state (GdkWindow       *window,
 356                                        GdkDevice       *device,
 357                                        gint            *x,
 358                                        gint            *y,
 359                                        GdkModifierType *mask)
 360 {
 361   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 362   GdkOffscreenWindow *offscreen;
 363   int tmpx, tmpy;
 364   double dtmpx, dtmpy;
 365   GdkModifierType tmpmask;
 366
 367   tmpx = 0;
 368   tmpy = 0;
 369   tmpmask = 0;
 370
 371   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 372   if (offscreen->embedder != NULL)
 373     {
 374       gdk_window_get_device_position (offscreen->embedder, device, &tmpx, &tmpy, &tmpmask);
 375       from_embedder (window,
 376                      tmpx, tmpy,
 377                      &dtmpx, &dtmpy);
 378       tmpx = floor (dtmpx + 0.5);
 379       tmpy = floor (dtmpy + 0.5);
 380     }
 381
 382   if (x)
 383     *x = tmpx;
 384   if (y)
 385     *y = tmpy;
 386   if (mask)
 387     *mask = tmpmask;
 388   return TRUE;
 389 }
 390
 391 /**
 392  * gdk_offscreen_window_get_surface:
 393  * @window: a #GdkWindow
 394  *
 395  * Gets the offscreen surface that an offscreen window renders into.
 396  * If you need to keep this around over window resizes, you need to
 397  * add a reference to it.
 398  *
 399  * Returns: The offscreen surface, or %NULL if not offscreen
 400  */
 401 cairo_surface_t *
 402 gdk_offscreen_window_get_surface (GdkWindow *window)
 403 {
 404   GdkWindowObject *private = (GdkWindowObject *)window;
 405   GdkOffscreenWindow *offscreen;
 406
 407   g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
 408
 409   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 410     return NULL;
 411
 412   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 413   return offscreen->surface;
 414 }
 415
 416 static void
 417 gdk_offscreen_window_raise (GdkWindow *window)
 418 {
 419   /* gdk_window_raise already changed the stacking order */
 420   _gdk_synthesize_crossing_events_for_geometry_change (window);
 421 }
 422
 423 static void
 424 gdk_offscreen_window_lower (GdkWindow *window)
 425 {
 426   /* gdk_window_lower already changed the stacking order */
 427   _gdk_synthesize_crossing_events_for_geometry_change (window);
 428 }
 429
 430 static void
 431 gdk_offscreen_window_move_resize_internal (GdkWindow *window,
 432                                            gint       x,
 433                                            gint       y,
 434                                            gint       width,
 435                                            gint       height,
 436                                            gboolean   send_expose_events)
 437 {
 438   GdkWindowObject *private = (GdkWindowObject *)window;
 439   GdkOffscreenWindow *offscreen;
 440   gint dx, dy, dw, dh;
 441   cairo_surface_t *old_surface;
 442
 443   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 444
 445   if (width < 1)
 446     width = 1;
 447   if (height < 1)
 448     height = 1;
 449
 450   if (private->destroyed)
 451     return;
 452
 453   dx = x - private->x;
 454   dy = y - private->y;
 455   dw = width - private->width;
 456   dh = height - private->height;
 457
 458   private->x = x;
 459   private->y = y;
 460
 461   if (private->width != width ||
 462       private->height != height)
 463     {
 464       cairo_t *cr;
 465
 466       private->width = width;
 467       private->height = height;
 468
 469       old_surface = offscreen->surface;
 470       offscreen->surface = cairo_surface_create_similar (old_surface,
 471                                                          cairo_surface_get_content (old_surface),
 472                                                          width,
 473                                                          height);
 474
 475       cr = cairo_create (offscreen->surface);
 476       cairo_set_source_surface (cr, old_surface, 0, 0);
 477       cairo_paint (cr);
 478       cairo_destroy (cr);
 479
 480       cairo_surface_destroy (old_surface);
 481     }
 482
 483   if (GDK_WINDOW_IS_MAPPED (private))
 484     {
 485       // TODO: Only invalidate new area, i.e. for larger windows
 486       gdk_window_invalidate_rect (window, NULL, TRUE);
 487       _gdk_synthesize_crossing_events_for_geometry_change (window);
 488     }
 489 }
 490
 491 static void
 492 gdk_offscreen_window_move_resize (GdkWindow *window,
 493                                   gboolean   with_move,
 494                                   gint       x,
 495                                   gint       y,
 496                                   gint       width,
 497                                   gint       height)
 498 {
 499   GdkWindowObject *private = (GdkWindowObject *)window;
 500   GdkOffscreenWindow *offscreen;
 501
 502   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 503
 504   if (!with_move)
 505     {
 506       x = private->x;
 507       y = private->y;
 508     }
 509
 510   if (width < 0)
 511     width = private->width;
 512
 513   if (height < 0)
 514     height = private->height;
 515
 516   gdk_offscreen_window_move_resize_internal (window, x, y,
 517                                              width, height,
 518                                              TRUE);
 519 }
 520
 521 static void
 522 gdk_offscreen_window_show (GdkWindow *window,
 523                            gboolean already_mapped)
 524 {
 525   GdkWindowObject *private = (GdkWindowObject *)window;
 526   GdkRectangle area = { 0, 0, private->width, private->height };
 527
 528   gdk_window_clear_area (window, 0, 0,
 529                          private->width, private->height);
 530   gdk_window_invalidate_rect (window, &area, FALSE);
 531 }
 532
 533
 534 static void
 535 gdk_offscreen_window_hide (GdkWindow *window)
 536 {
 537   GdkWindowObject *private;
 538   GdkOffscreenWindow *offscreen;
 539   GdkDisplay *display;
 540
 541   g_return_if_fail (window != NULL);
 542
 543   private = (GdkWindowObject*) window;
 544   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 545
 546   /* May need to break grabs on children */
 547   display = gdk_drawable_get_display (window);
 548
 549   /* TODO: This needs updating to the new grab world */
 550 #if 0
 551   if (display->pointer_grab.window != NULL)
 552     {
 553       if (is_parent_of (window, display->pointer_grab.window))
 554         {
 555           /* Call this ourselves, even though gdk_display_pointer_ungrab
 556              does so too, since we want to pass implicit == TRUE so the
 557              broken grab event is generated */
 558           _gdk_display_unset_has_pointer_grab (display,
 559                                                TRUE,
 560                                                FALSE,
 561                                                GDK_CURRENT_TIME);
 562           gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME);
 563         }
 564     }
 565 #endif
 566 }
 567
 568 static void
 569 gdk_offscreen_window_withdraw (GdkWindow *window)
 570 {
 571 }
 572
 573 static GdkEventMask
 574 gdk_offscreen_window_get_events (GdkWindow *window)
 575 {
 576   return 0;
 577 }
 578
 579 static void
 580 gdk_offscreen_window_set_events (GdkWindow       *window,
 581                                  GdkEventMask     event_mask)
 582 {
 583 }
 584
 585 static void
 586 gdk_offscreen_window_set_background (GdkWindow      *window,
 587                                      cairo_pattern_t *pattern)
 588 {
 589 }
 590
 591 static void
 592 gdk_offscreen_window_shape_combine_region (GdkWindow       *window,
 593                                            const cairo_region_t *shape_region,
 594                                            gint             offset_x,
 595                                            gint             offset_y)
 596 {
 597 }
 598
 599 static void
 600 gdk_offscreen_window_input_shape_combine_region (GdkWindow       *window,
 601                                                  const cairo_region_t *shape_region,
 602                                                  gint             offset_x,
 603                                                  gint             offset_y)
 604 {
 605 }
 606
 607 static gboolean
 608 gdk_offscreen_window_set_static_gravities (GdkWindow *window,
 609                                            gboolean   use_static)
 610 {
 611   return TRUE;
 612 }
 613
 614 static void
 615 gdk_offscreen_window_get_geometry (GdkWindow *window,
 616                                    gint      *x,
 617                                    gint      *y,
 618                                    gint      *width,
 619                                    gint      *height,
 620                                    gint      *depth)
 621 {
 622   GdkWindowObject *private = (GdkWindowObject *)window;
 623
 624   g_return_if_fail (window == NULL || GDK_IS_WINDOW (window));
 625
 626   if (!GDK_WINDOW_DESTROYED (window))
 627     {
 628       if (x)
 629         *x = private->x;
 630       if (y)
 631         *y = private->y;
 632       if (width)
 633         *width = private->width;
 634       if (height)
 635         *height = private->height;
 636       if (depth)
 637         *depth = private->depth;
 638     }
 639 }
 640
 641 static gboolean
 642 gdk_offscreen_window_queue_antiexpose (GdkWindow *window,
 643                                        cairo_region_t *area)
 644 {
 645   return FALSE;
 646 }
 647
 648 static void
 649 gdk_offscreen_window_translate (GdkWindow      *window,
 650                                 cairo_region_t *area,
 651                                 gint            dx,
 652                                 gint            dy)
 653 {
 654   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (((GdkWindowObject *) window)->impl);
 655   cairo_t *cr;
 656
 657   cr = cairo_create (offscreen->surface);
 658
 659   area = cairo_region_copy (area);
 660
 661   gdk_cairo_region (cr, area);
 662   cairo_clip (cr);
 663
 664   /* NB: This is a self-copy and Cairo doesn't support that yet.
 665    * So we do a litle trick.
 666    */
 667   cairo_push_group (cr);
 668
 669   cairo_set_source_surface (cr, offscreen->surface, dx, dy);
 670   cairo_paint (cr);
 671
 672   cairo_pop_group_to_source (cr);
 673   cairo_paint (cr);
 674
 675   cairo_destroy (cr);
 676
 677   _gdk_window_add_damage (window, area);
 678 }
 679
 680 /**
 681  * gdk_offscreen_window_set_embedder:
 682  * @window: a #GdkWindow
 683  * @embedder: the #GdkWindow that @window gets embedded in
 684  *
 685  * Sets @window to be embedded in @embedder.
 686  *
 687  * To fully embed an offscreen window, in addition to calling this
 688  * function, it is also necessary to handle the #GdkWindow::pick-embedded-child
 689  * signal on the @embedder and the #GdkWindow::to-embedder and
 690  * #GdkWindow::from-embedder signals on @window.
 691  *
 692  * Since: 2.18
 693  */
 694 void
 695 gdk_offscreen_window_set_embedder (GdkWindow     *window,
 696                                    GdkWindow     *embedder)
 697 {
 698   GdkWindowObject *private = (GdkWindowObject *)window;
 699   GdkOffscreenWindow *offscreen;
 700
 701   g_return_if_fail (GDK_IS_WINDOW (window));
 702
 703   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 704     return;
 705
 706   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 707
 708   if (embedder)
 709     {
 710       g_object_ref (embedder);
 711       GDK_WINDOW_OBJECT (embedder)->num_offscreen_children++;
 712     }
 713
 714   if (offscreen->embedder)
 715     {
 716       g_object_unref (offscreen->embedder);
 717       GDK_WINDOW_OBJECT (offscreen->embedder)->num_offscreen_children--;
 718     }
 719
 720   offscreen->embedder = embedder;
 721 }
 722
 723 /**
 724  * gdk_offscreen_window_get_embedder:
 725  * @window: a #GdkWindow
 726  *
 727  * Gets the window that @window is embedded in.
 728  *
 729  * Returns: the embedding #GdkWindow, or %NULL if @window is not an
 730  *     embedded offscreen window
 731  *
 732  * Since: 2.18
 733  */
 734 GdkWindow *
 735 gdk_offscreen_window_get_embedder (GdkWindow *window)
 736 {
 737   GdkWindowObject *private = (GdkWindowObject *)window;
 738   GdkOffscreenWindow *offscreen;
 739
 740   g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
 741
 742   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 743     return NULL;
 744
 745   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 746
 747   return offscreen->embedder;
 748 }
 749
 750 static void
 751 gdk_offscreen_window_class_init (GdkOffscreenWindowClass *klass)
 752 {
 753   GdkDrawableClass *drawable_class = GDK_DRAWABLE_CLASS (klass);
 754   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 755
 756   object_class->finalize = gdk_offscreen_window_finalize;
 757
 758   drawable_class->ref_cairo_surface = gdk_offscreen_window_ref_cairo_surface;
 759   drawable_class->set_colormap = gdk_offscreen_window_set_colormap;
 760   drawable_class->get_colormap = gdk_offscreen_window_get_colormap;
 761   drawable_class->get_depth = gdk_offscreen_window_get_depth;
 762   drawable_class->get_screen = gdk_offscreen_window_get_screen;
 763   drawable_class->get_visual = gdk_offscreen_window_get_visual;
 764 }
 765
 766 static void
 767 gdk_offscreen_window_impl_iface_init (GdkWindowImplIface *iface)
 768 {
 769   iface->show = gdk_offscreen_window_show;
 770   iface->hide = gdk_offscreen_window_hide;
 771   iface->withdraw = gdk_offscreen_window_withdraw;
 772   iface->raise = gdk_offscreen_window_raise;
 773   iface->lower = gdk_offscreen_window_lower;
 774   iface->move_resize = gdk_offscreen_window_move_resize;
 775   iface->set_background = gdk_offscreen_window_set_background;
 776   iface->get_events = gdk_offscreen_window_get_events;
 777   iface->set_events = gdk_offscreen_window_set_events;
 778   iface->reparent = gdk_offscreen_window_reparent;
 779   iface->get_geometry = gdk_offscreen_window_get_geometry;
 780   iface->shape_combine_region = gdk_offscreen_window_shape_combine_region;
 781   iface->input_shape_combine_region = gdk_offscreen_window_input_shape_combine_region;
 782   iface->set_static_gravities = gdk_offscreen_window_set_static_gravities;
 783   iface->queue_antiexpose = gdk_offscreen_window_queue_antiexpose;
 784   iface->translate = gdk_offscreen_window_translate;
 785   iface->get_root_coords = gdk_offscreen_window_get_root_coords;
 786   iface->get_device_state = gdk_offscreen_window_get_device_state;
 787   iface->destroy = gdk_offscreen_window_destroy;
 788 }