+bool wxScreenDC::StartDrawingOnTop(wxWindow* window)
+{
+ wxRect rect;
+ int x, y, width, height;
+ window->GetPosition(& x, & y);
+ if (window->GetParent())
+ window->GetParent()->ClientToScreen(& x, & y);
+ window->GetSize(& width, & height);
+ rect.x = x; rect.y = y;
+ rect.width = width; rect.height = height;
+
+ return StartDrawingOnTop(& rect);
+}
+
+bool wxScreenDC::StartDrawingOnTop(wxRect* rect)
+{
+ if (sm_overlayWindow)
+ return FALSE;
+
+ Display *dpy = (Display*) wxGetDisplay();
+ Pixmap screenPixmap = RootWindow(dpy, DefaultScreen(dpy));
+
+ int x = 0;
+ int y = 0;
+ int width, height;
+ wxDisplaySize(&width, &height);
+
+ if (rect)
+ {
+ x = rect->x; y = rect->y;
+ width = rect->width; height = rect->height;
+ }
+ sm_overlayWindowX = x;
+ sm_overlayWindowY = y;
+
+ XSetWindowAttributes attributes;
+ attributes.override_redirect = True;
+ unsigned long valueMask = CWOverrideRedirect;
+
+ sm_overlayWindow = (WXWindow) XCreateWindow(dpy, screenPixmap, x, y, width, height, 0,
+ wxDisplayDepth(), InputOutput,
+ DefaultVisual(dpy, 0), valueMask,
+ & attributes);
+
+ if (sm_overlayWindow)
+ {
+ XMapWindow(dpy, (Window) sm_overlayWindow);
+ return TRUE;
+ }
+ else
+ return FALSE;
+}
+
+bool wxScreenDC::EndDrawingOnTop()
+{
+ if (sm_overlayWindow)
+ {
+ XDestroyWindow((Display*) wxGetDisplay(), (Window) sm_overlayWindow);
+ sm_overlayWindow = 0;
+ return TRUE;
+ }
+ else
+ return FALSE;
+}