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 "gdkpixmap.h"
  34 #include "gdkdrawable.h"
  35 #include "gdktypes.h"
  36 #include "gdkscreen.h"
  37 #include "gdkcolor.h"
  38 #include "gdkcursor.h"
  39
  40
  41 /* LIMITATIONS:
  42  *
  43  * Offscreen windows can't be the child of a foreign window,
  44  *   nor contain foreign windows
  45  * GDK_POINTER_MOTION_HINT_MASK isn't effective
  46  */
  47
  48 typedef struct _GdkOffscreenWindow      GdkOffscreenWindow;
  49 typedef struct _GdkOffscreenWindowClass GdkOffscreenWindowClass;
  50
  51 struct _GdkOffscreenWindow
  52 {
  53   GdkDrawable parent_instance;
  54
  55   GdkWindow *wrapper;
  56   GdkCursor *cursor;
  57   GdkColormap *colormap;
  58   GdkScreen *screen;
  59
  60   GdkPixmap *pixmap;
  61   GdkWindow *embedder;
  62 };
  63
  64 struct _GdkOffscreenWindowClass
  65 {
  66   GdkDrawableClass parent_class;
  67 };
  68
  69 #define GDK_TYPE_OFFSCREEN_WINDOW            (gdk_offscreen_window_get_type())
  70 #define GDK_OFFSCREEN_WINDOW(object)         (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindow))
  71 #define GDK_IS_OFFSCREEN_WINDOW(object)      (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_OFFSCREEN_WINDOW))
  72 #define GDK_OFFSCREEN_WINDOW_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))
  73 #define GDK_IS_OFFSCREEN_WINDOW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_OFFSCREEN_WINDOW))
  74 #define GDK_OFFSCREEN_WINDOW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_OFFSCREEN_WINDOW, GdkOffscreenWindowClass))
  75
  76 static void       gdk_offscreen_window_impl_iface_init    (GdkWindowImplIface         *iface);
  77 static void       gdk_offscreen_window_hide               (GdkWindow                  *window);
  78
  79 G_DEFINE_TYPE_WITH_CODE (GdkOffscreenWindow,
  80                          gdk_offscreen_window,
  81                          GDK_TYPE_DRAWABLE,
  82                          G_IMPLEMENT_INTERFACE (GDK_TYPE_WINDOW_IMPL,
  83                                                 gdk_offscreen_window_impl_iface_init));
  84
  85
  86 static void
  87 gdk_offscreen_window_finalize (GObject *object)
  88 {
  89   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (object);
  90
  91   if (offscreen->cursor)
  92     gdk_cursor_unref (offscreen->cursor);
  93
  94   offscreen->cursor = NULL;
  95
  96   g_object_unref (offscreen->pixmap);
  97
  98   G_OBJECT_CLASS (gdk_offscreen_window_parent_class)->finalize (object);
  99 }
 100
 101 static void
 102 gdk_offscreen_window_init (GdkOffscreenWindow *window)
 103 {
 104 }
 105
 106 static void
 107 gdk_offscreen_window_destroy (GdkWindow *window,
 108                               gboolean   recursing,
 109                               gboolean   foreign_destroy)
 110 {
 111   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 112   GdkOffscreenWindow *offscreen;
 113
 114   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 115
 116   gdk_offscreen_window_set_embedder (window, NULL);
 117
 118   if (!recursing)
 119     gdk_offscreen_window_hide (window);
 120
 121   g_object_unref (offscreen->colormap);
 122   offscreen->colormap = NULL;
 123 }
 124
 125 static gboolean
 126 is_parent_of (GdkWindow *parent,
 127               GdkWindow *child)
 128 {
 129   GdkWindow *w;
 130
 131   w = child;
 132   while (w != NULL)
 133     {
 134       if (w == parent)
 135         return TRUE;
 136
 137       w = gdk_window_get_parent (w);
 138     }
 139
 140   return FALSE;
 141 }
 142
 143 static cairo_surface_t *
 144 gdk_offscreen_window_ref_cairo_surface (GdkDrawable *drawable)
 145 {
 146   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 147
 148   return _gdk_drawable_ref_cairo_surface (offscreen->pixmap);
 149 }
 150
 151 static GdkColormap*
 152 gdk_offscreen_window_get_colormap (GdkDrawable *drawable)
 153 {
 154   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 155
 156   return offscreen->colormap;
 157 }
 158
 159 static void
 160 gdk_offscreen_window_set_colormap (GdkDrawable *drawable,
 161                                    GdkColormap*colormap)
 162 {
 163   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 164
 165   if (colormap && GDK_WINDOW_DESTROYED (offscreen->wrapper))
 166     return;
 167
 168   if (offscreen->colormap == colormap)
 169     return;
 170
 171   if (offscreen->colormap)
 172     g_object_unref (offscreen->colormap);
 173
 174   offscreen->colormap = colormap;
 175   if (offscreen->colormap)
 176     g_object_ref (offscreen->colormap);
 177 }
 178
 179
 180 static gint
 181 gdk_offscreen_window_get_depth (GdkDrawable *drawable)
 182 {
 183   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 184
 185   return gdk_drawable_get_depth (offscreen->wrapper);
 186 }
 187
 188 static GdkDrawable *
 189 gdk_offscreen_window_get_source_drawable (GdkDrawable  *drawable)
 190 {
 191   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 192
 193   return _gdk_drawable_get_source_drawable (offscreen->pixmap);
 194 }
 195
 196 static GdkScreen*
 197 gdk_offscreen_window_get_screen (GdkDrawable *drawable)
 198 {
 199   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 200
 201   return offscreen->screen;
 202 }
 203
 204 static GdkVisual*
 205 gdk_offscreen_window_get_visual (GdkDrawable    *drawable)
 206 {
 207   GdkOffscreenWindow *offscreen = GDK_OFFSCREEN_WINDOW (drawable);
 208
 209   return gdk_drawable_get_visual (offscreen->wrapper);
 210 }
 211
 212 void
 213 _gdk_offscreen_window_new (GdkWindow     *window,
 214                            GdkScreen     *screen,
 215                            GdkVisual     *visual,
 216                            GdkWindowAttr *attributes,
 217                            gint           attributes_mask)
 218 {
 219   GdkWindowObject *private;
 220   GdkOffscreenWindow *offscreen;
 221
 222   g_return_if_fail (attributes != NULL);
 223
 224   if (attributes->wclass != GDK_INPUT_OUTPUT)
 225     return; /* Can't support input only offscreens */
 226
 227   private = (GdkWindowObject *)window;
 228
 229   if (private->parent != NULL && GDK_WINDOW_DESTROYED (private->parent))
 230     return;
 231
 232   private->impl = g_object_new (GDK_TYPE_OFFSCREEN_WINDOW, NULL);
 233   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 234   offscreen->wrapper = window;
 235
 236   offscreen->screen = screen;
 237
 238   if (attributes_mask & GDK_WA_COLORMAP)
 239     offscreen->colormap = g_object_ref (attributes->colormap);
 240   else
 241     {
 242       if (gdk_screen_get_system_visual (screen) == visual)
 243         {
 244           offscreen->colormap = gdk_screen_get_system_colormap (screen);
 245           g_object_ref (offscreen->colormap);
 246         }
 247       else
 248         offscreen->colormap = gdk_colormap_new (visual, FALSE);
 249     }
 250
 251   offscreen->pixmap = gdk_pixmap_new ((GdkDrawable *)private->parent,
 252                                       private->width,
 253                                       private->height,
 254                                       private->depth);
 255   gdk_drawable_set_colormap (offscreen->pixmap, offscreen->colormap);
 256 }
 257
 258 static gboolean
 259 gdk_offscreen_window_reparent (GdkWindow *window,
 260                                GdkWindow *new_parent,
 261                                gint       x,
 262                                gint       y)
 263 {
 264   GdkWindowObject *private = (GdkWindowObject *)window;
 265   GdkWindowObject *new_parent_private = (GdkWindowObject *)new_parent;
 266   GdkWindowObject *old_parent;
 267   gboolean was_mapped;
 268
 269   if (new_parent)
 270     {
 271       /* No input-output children of input-only windows */
 272       if (new_parent_private->input_only && !private->input_only)
 273         return FALSE;
 274
 275       /* Don't create loops in hierarchy */
 276       if (is_parent_of (window, new_parent))
 277         return FALSE;
 278     }
 279
 280   was_mapped = GDK_WINDOW_IS_MAPPED (window);
 281
 282   gdk_window_hide (window);
 283
 284   if (private->parent)
 285     private->parent->children = g_list_remove (private->parent->children, window);
 286
 287   old_parent = private->parent;
 288   private->parent = new_parent_private;
 289   private->x = x;
 290   private->y = y;
 291
 292   if (new_parent_private)
 293     private->parent->children = g_list_prepend (private->parent->children, window);
 294
 295   _gdk_synthesize_crossing_events_for_geometry_change (window);
 296   if (old_parent)
 297     _gdk_synthesize_crossing_events_for_geometry_change (GDK_WINDOW (old_parent));
 298
 299   return was_mapped;
 300 }
 301
 302 static void
 303 from_embedder (GdkWindow *window,
 304                double embedder_x, double embedder_y,
 305                double *offscreen_x, double *offscreen_y)
 306 {
 307   GdkWindowObject *private;
 308
 309   private = (GdkWindowObject *)window;
 310
 311   g_signal_emit_by_name (private->impl_window,
 312                          "from-embedder",
 313                          embedder_x, embedder_y,
 314                          offscreen_x, offscreen_y,
 315                          NULL);
 316 }
 317
 318 static void
 319 to_embedder (GdkWindow *window,
 320              double offscreen_x, double offscreen_y,
 321              double *embedder_x, double *embedder_y)
 322 {
 323   GdkWindowObject *private;
 324
 325   private = (GdkWindowObject *)window;
 326
 327   g_signal_emit_by_name (private->impl_window,
 328                          "to-embedder",
 329                          offscreen_x, offscreen_y,
 330                          embedder_x, embedder_y,
 331                          NULL);
 332 }
 333
 334 static gint
 335 gdk_offscreen_window_get_root_coords (GdkWindow *window,
 336                                       gint       x,
 337                                       gint       y,
 338                                       gint      *root_x,
 339                                       gint      *root_y)
 340 {
 341   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 342   GdkOffscreenWindow *offscreen;
 343   int tmpx, tmpy;
 344
 345   tmpx = x;
 346   tmpy = y;
 347
 348   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 349   if (offscreen->embedder)
 350     {
 351       double dx, dy;
 352       to_embedder (window,
 353                    x, y,
 354                    &dx, &dy);
 355       tmpx = floor (dx + 0.5);
 356       tmpy = floor (dy + 0.5);
 357       gdk_window_get_root_coords (offscreen->embedder,
 358                                   tmpx, tmpy,
 359                                   &tmpx, &tmpy);
 360
 361     }
 362
 363   if (root_x)
 364     *root_x = tmpx;
 365   if (root_y)
 366     *root_y = tmpy;
 367
 368   return TRUE;
 369 }
 370
 371 static gboolean
 372 gdk_offscreen_window_get_device_state (GdkWindow       *window,
 373                                        GdkDevice       *device,
 374                                        gint            *x,
 375                                        gint            *y,
 376                                        GdkModifierType *mask)
 377 {
 378   GdkWindowObject *private = GDK_WINDOW_OBJECT (window);
 379   GdkOffscreenWindow *offscreen;
 380   int tmpx, tmpy;
 381   double dtmpx, dtmpy;
 382   GdkModifierType tmpmask;
 383
 384   tmpx = 0;
 385   tmpy = 0;
 386   tmpmask = 0;
 387
 388   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 389   if (offscreen->embedder != NULL)
 390     {
 391       gdk_window_get_device_position (offscreen->embedder, device, &tmpx, &tmpy, &tmpmask);
 392       from_embedder (window,
 393                      tmpx, tmpy,
 394                      &dtmpx, &dtmpy);
 395       tmpx = floor (dtmpx + 0.5);
 396       tmpy = floor (dtmpy + 0.5);
 397     }
 398
 399   if (x)
 400     *x = tmpx;
 401   if (y)
 402     *y = tmpy;
 403   if (mask)
 404     *mask = tmpmask;
 405   return TRUE;
 406 }
 407
 408 /**
 409  * gdk_offscreen_window_get_pixmap:
 410  * @window: a #GdkWindow
 411  *
 412  * Gets the offscreen pixmap that an offscreen window renders into.
 413  * If you need to keep this around over window resizes, you need to
 414  * add a reference to it.
 415  *
 416  * Returns: The offscreen pixmap, or %NULL if not offscreen
 417  *
 418  * Since: 2.18
 419  */
 420 GdkPixmap *
 421 gdk_offscreen_window_get_pixmap (GdkWindow *window)
 422 {
 423   GdkWindowObject *private = (GdkWindowObject *)window;
 424   GdkOffscreenWindow *offscreen;
 425
 426   g_return_val_if_fail (GDK_IS_WINDOW (window), FALSE);
 427
 428   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 429     return NULL;
 430
 431   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 432   return offscreen->pixmap;
 433 }
 434
 435 static void
 436 gdk_offscreen_window_raise (GdkWindow *window)
 437 {
 438   /* gdk_window_raise already changed the stacking order */
 439   _gdk_synthesize_crossing_events_for_geometry_change (window);
 440 }
 441
 442 static void
 443 gdk_offscreen_window_lower (GdkWindow *window)
 444 {
 445   /* gdk_window_lower already changed the stacking order */
 446   _gdk_synthesize_crossing_events_for_geometry_change (window);
 447 }
 448
 449 static void
 450 gdk_offscreen_window_move_resize_internal (GdkWindow *window,
 451                                            gint       x,
 452                                            gint       y,
 453                                            gint       width,
 454                                            gint       height,
 455                                            gboolean   send_expose_events)
 456 {
 457   GdkWindowObject *private = (GdkWindowObject *)window;
 458   GdkOffscreenWindow *offscreen;
 459   gint dx, dy, dw, dh;
 460   GdkPixmap *old_pixmap;
 461
 462   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 463
 464   if (width < 1)
 465     width = 1;
 466   if (height < 1)
 467     height = 1;
 468
 469   if (private->destroyed)
 470     return;
 471
 472   dx = x - private->x;
 473   dy = y - private->y;
 474   dw = width - private->width;
 475   dh = height - private->height;
 476
 477   private->x = x;
 478   private->y = y;
 479
 480   if (private->width != width ||
 481       private->height != height)
 482     {
 483       cairo_t *cr;
 484
 485       private->width = width;
 486       private->height = height;
 487
 488       old_pixmap = offscreen->pixmap;
 489       offscreen->pixmap = gdk_pixmap_new (GDK_DRAWABLE (old_pixmap),
 490                                           width,
 491                                           height,
 492                                           private->depth);
 493
 494       cr = gdk_cairo_create (offscreen->pixmap);
 495       gdk_cairo_set_source_pixmap (cr, old_pixmap, 0, 0);
 496       cairo_paint (cr);
 497       cairo_destroy (cr);
 498     }
 499
 500   if (GDK_WINDOW_IS_MAPPED (private))
 501     {
 502       // TODO: Only invalidate new area, i.e. for larger windows
 503       gdk_window_invalidate_rect (window, NULL, TRUE);
 504       _gdk_synthesize_crossing_events_for_geometry_change (window);
 505     }
 506 }
 507
 508 static void
 509 gdk_offscreen_window_move_resize (GdkWindow *window,
 510                                   gboolean   with_move,
 511                                   gint       x,
 512                                   gint       y,
 513                                   gint       width,
 514                                   gint       height)
 515 {
 516   GdkWindowObject *private = (GdkWindowObject *)window;
 517   GdkOffscreenWindow *offscreen;
 518
 519   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 520
 521   if (!with_move)
 522     {
 523       x = private->x;
 524       y = private->y;
 525     }
 526
 527   if (width < 0)
 528     width = private->width;
 529
 530   if (height < 0)
 531     height = private->height;
 532
 533   gdk_offscreen_window_move_resize_internal (window, x, y,
 534                                              width, height,
 535                                              TRUE);
 536 }
 537
 538 static void
 539 gdk_offscreen_window_show (GdkWindow *window,
 540                            gboolean already_mapped)
 541 {
 542   GdkWindowObject *private = (GdkWindowObject *)window;
 543   GdkRectangle area = { 0, 0, private->width, private->height };
 544
 545   gdk_window_clear_area (window, 0, 0,
 546                          private->width, private->height);
 547   gdk_window_invalidate_rect (window, &area, FALSE);
 548 }
 549
 550
 551 static void
 552 gdk_offscreen_window_hide (GdkWindow *window)
 553 {
 554   GdkWindowObject *private;
 555   GdkOffscreenWindow *offscreen;
 556   GdkDisplay *display;
 557
 558   g_return_if_fail (window != NULL);
 559
 560   private = (GdkWindowObject*) window;
 561   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 562
 563   /* May need to break grabs on children */
 564   display = gdk_drawable_get_display (window);
 565
 566   /* TODO: This needs updating to the new grab world */
 567 #if 0
 568   if (display->pointer_grab.window != NULL)
 569     {
 570       if (is_parent_of (window, display->pointer_grab.window))
 571         {
 572           /* Call this ourselves, even though gdk_display_pointer_ungrab
 573              does so too, since we want to pass implicit == TRUE so the
 574              broken grab event is generated */
 575           _gdk_display_unset_has_pointer_grab (display,
 576                                                TRUE,
 577                                                FALSE,
 578                                                GDK_CURRENT_TIME);
 579           gdk_display_pointer_ungrab (display, GDK_CURRENT_TIME);
 580         }
 581     }
 582 #endif
 583 }
 584
 585 static void
 586 gdk_offscreen_window_withdraw (GdkWindow *window)
 587 {
 588 }
 589
 590 static GdkEventMask
 591 gdk_offscreen_window_get_events (GdkWindow *window)
 592 {
 593   return 0;
 594 }
 595
 596 static void
 597 gdk_offscreen_window_set_events (GdkWindow       *window,
 598                                  GdkEventMask     event_mask)
 599 {
 600 }
 601
 602 static void
 603 gdk_offscreen_window_set_background (GdkWindow      *window,
 604                                      const GdkColor *color)
 605 {
 606   GdkWindowObject *private = (GdkWindowObject *)window;
 607
 608   private->bg_color = *color;
 609
 610   if (private->bg_pixmap &&
 611       private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
 612       private->bg_pixmap != GDK_NO_BG)
 613     g_object_unref (private->bg_pixmap);
 614
 615   private->bg_pixmap = NULL;
 616 }
 617
 618 static void
 619 gdk_offscreen_window_set_back_pixmap (GdkWindow *window,
 620                                       GdkPixmap *pixmap)
 621 {
 622   GdkWindowObject *private = (GdkWindowObject *)window;
 623
 624   if (pixmap &&
 625       private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
 626       private->bg_pixmap != GDK_NO_BG &&
 627       !gdk_drawable_get_colormap (pixmap))
 628     {
 629       g_warning ("gdk_window_set_back_pixmap(): pixmap must have a colormap");
 630       return;
 631     }
 632
 633   if (private->bg_pixmap &&
 634       private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
 635       private->bg_pixmap != GDK_NO_BG)
 636     g_object_unref (private->bg_pixmap);
 637
 638   private->bg_pixmap = pixmap;
 639
 640   if (pixmap &&
 641       private->bg_pixmap != GDK_PARENT_RELATIVE_BG &&
 642       private->bg_pixmap != GDK_NO_BG)
 643     g_object_ref (pixmap);
 644 }
 645
 646 static void
 647 gdk_offscreen_window_shape_combine_region (GdkWindow       *window,
 648                                            const cairo_region_t *shape_region,
 649                                            gint             offset_x,
 650                                            gint             offset_y)
 651 {
 652 }
 653
 654 static void
 655 gdk_offscreen_window_input_shape_combine_region (GdkWindow       *window,
 656                                                  const cairo_region_t *shape_region,
 657                                                  gint             offset_x,
 658                                                  gint             offset_y)
 659 {
 660 }
 661
 662 static gboolean
 663 gdk_offscreen_window_set_static_gravities (GdkWindow *window,
 664                                            gboolean   use_static)
 665 {
 666   return TRUE;
 667 }
 668
 669 static void
 670 gdk_offscreen_window_get_geometry (GdkWindow *window,
 671                                    gint      *x,
 672                                    gint      *y,
 673                                    gint      *width,
 674                                    gint      *height,
 675                                    gint      *depth)
 676 {
 677   GdkWindowObject *private = (GdkWindowObject *)window;
 678
 679   g_return_if_fail (window == NULL || GDK_IS_WINDOW (window));
 680
 681   if (!GDK_WINDOW_DESTROYED (window))
 682     {
 683       if (x)
 684         *x = private->x;
 685       if (y)
 686         *y = private->y;
 687       if (width)
 688         *width = private->width;
 689       if (height)
 690         *height = private->height;
 691       if (depth)
 692         *depth = private->depth;
 693     }
 694 }
 695
 696 static gboolean
 697 gdk_offscreen_window_queue_antiexpose (GdkWindow *window,
 698                                        cairo_region_t *area)
 699 {
 700   return FALSE;
 701 }
 702
 703 static void
 704 gdk_offscreen_window_translate (GdkWindow      *window,
 705                                 cairo_region_t *area,
 706                                 gint            dx,
 707                                 gint            dy)
 708 {
 709   cairo_surface_t *surface;
 710   cairo_t *cr;
 711
 712   /* Can't use gdk_cairo_create here due to clipping */
 713   surface = _gdk_drawable_ref_cairo_surface (window);
 714   cr = cairo_create (surface);
 715   cairo_surface_destroy (surface);
 716
 717   area = cairo_region_copy (area);
 718
 719   gdk_cairo_region (cr, area);
 720   cairo_clip (cr);
 721
 722   /* NB: This is a self-copy and Cairo doesn't support that yet.
 723    * So we do a litle trick.
 724    */
 725   cairo_push_group (cr);
 726
 727   gdk_cairo_set_source_pixmap (cr, window, dx, dy);
 728   cairo_paint (cr);
 729
 730   cairo_pop_group_to_source (cr);
 731   cairo_paint (cr);
 732
 733   cairo_destroy (cr);
 734
 735   _gdk_window_add_damage (window, area);
 736 }
 737
 738 /**
 739  * gdk_offscreen_window_set_embedder:
 740  * @window: a #GdkWindow
 741  * @embedder: the #GdkWindow that @window gets embedded in
 742  *
 743  * Sets @window to be embedded in @embedder.
 744  *
 745  * To fully embed an offscreen window, in addition to calling this
 746  * function, it is also necessary to handle the #GdkWindow::pick-embedded-child
 747  * signal on the @embedder and the #GdkWindow::to-embedder and
 748  * #GdkWindow::from-embedder signals on @window.
 749  *
 750  * Since: 2.18
 751  */
 752 void
 753 gdk_offscreen_window_set_embedder (GdkWindow     *window,
 754                                    GdkWindow     *embedder)
 755 {
 756   GdkWindowObject *private = (GdkWindowObject *)window;
 757   GdkOffscreenWindow *offscreen;
 758
 759   g_return_if_fail (GDK_IS_WINDOW (window));
 760
 761   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 762     return;
 763
 764   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 765
 766   if (embedder)
 767     {
 768       g_object_ref (embedder);
 769       GDK_WINDOW_OBJECT (embedder)->num_offscreen_children++;
 770     }
 771
 772   if (offscreen->embedder)
 773     {
 774       g_object_unref (offscreen->embedder);
 775       GDK_WINDOW_OBJECT (offscreen->embedder)->num_offscreen_children--;
 776     }
 777
 778   offscreen->embedder = embedder;
 779 }
 780
 781 /**
 782  * gdk_offscreen_window_get_embedder:
 783  * @window: a #GdkWindow
 784  *
 785  * Gets the window that @window is embedded in.
 786  *
 787  * Returns: the embedding #GdkWindow, or %NULL if @window is not an
 788  *     embedded offscreen window
 789  *
 790  * Since: 2.18
 791  */
 792 GdkWindow *
 793 gdk_offscreen_window_get_embedder (GdkWindow *window)
 794 {
 795   GdkWindowObject *private = (GdkWindowObject *)window;
 796   GdkOffscreenWindow *offscreen;
 797
 798   g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
 799
 800   if (!GDK_IS_OFFSCREEN_WINDOW (private->impl))
 801     return NULL;
 802
 803   offscreen = GDK_OFFSCREEN_WINDOW (private->impl);
 804
 805   return offscreen->embedder;
 806 }
 807
 808 static void
 809 gdk_offscreen_window_class_init (GdkOffscreenWindowClass *klass)
 810 {
 811   GdkDrawableClass *drawable_class = GDK_DRAWABLE_CLASS (klass);
 812   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 813
 814   object_class->finalize = gdk_offscreen_window_finalize;
 815
 816   drawable_class->ref_cairo_surface = gdk_offscreen_window_ref_cairo_surface;
 817   drawable_class->set_colormap = gdk_offscreen_window_set_colormap;
 818   drawable_class->get_colormap = gdk_offscreen_window_get_colormap;
 819   drawable_class->get_depth = gdk_offscreen_window_get_depth;
 820   drawable_class->get_screen = gdk_offscreen_window_get_screen;
 821   drawable_class->get_visual = gdk_offscreen_window_get_visual;
 822   drawable_class->get_source_drawable = gdk_offscreen_window_get_source_drawable;
 823 }
 824
 825 static void
 826 gdk_offscreen_window_impl_iface_init (GdkWindowImplIface *iface)
 827 {
 828   iface->show = gdk_offscreen_window_show;
 829   iface->hide = gdk_offscreen_window_hide;
 830   iface->withdraw = gdk_offscreen_window_withdraw;
 831   iface->raise = gdk_offscreen_window_raise;
 832   iface->lower = gdk_offscreen_window_lower;
 833   iface->move_resize = gdk_offscreen_window_move_resize;
 834   iface->set_background = gdk_offscreen_window_set_background;
 835   iface->set_back_pixmap = gdk_offscreen_window_set_back_pixmap;
 836   iface->get_events = gdk_offscreen_window_get_events;
 837   iface->set_events = gdk_offscreen_window_set_events;
 838   iface->reparent = gdk_offscreen_window_reparent;
 839   iface->get_geometry = gdk_offscreen_window_get_geometry;
 840   iface->shape_combine_region = gdk_offscreen_window_shape_combine_region;
 841   iface->input_shape_combine_region = gdk_offscreen_window_input_shape_combine_region;
 842   iface->set_static_gravities = gdk_offscreen_window_set_static_gravities;
 843   iface->queue_antiexpose = gdk_offscreen_window_queue_antiexpose;
 844   iface->translate = gdk_offscreen_window_translate;
 845   iface->get_root_coords = gdk_offscreen_window_get_root_coords;
 846   iface->get_device_state = gdk_offscreen_window_get_device_state;
 847   iface->destroy = gdk_offscreen_window_destroy;
 848 }