[Nautilus-list] Fix background flash

[Jonathan Blandford <jrb redhat com>]

Hi,

Here's a small patch to fix the 'flash' that occurs when you start
nautilus.  The problem was that nautilus was creating a toplevel window,
but not setting the background until much later.  It is fixed by
setting the background pixmap of the window to that of the root window.

Is it okay to commit?
Thanks,
-Jonathan

--- nautilus-1.0.4/src/nautilus-desktop-window.c.noflash	Tue Jul 10 14:13:32 2001
+++ nautilus-1.0.4/src/nautilus-desktop-window.c	Tue Jul 10 15:12:35 2001
@@ -173,6 +173,12 @@
 realize (GtkWidget *widget)
 {
 	NautilusDesktopWindow *window;
+	GdkAtom type;
+	gulong nitems, bytes_after;
+	gint format;
+	guchar *data;
+	gboolean have_set_background = FALSE;
+	Window w;
 
 	window = NAUTILUS_DESKTOP_WINDOW (widget);
 
@@ -225,6 +231,54 @@
 				0, 0,
 				gdk_screen_width (),
 				gdk_screen_height ());
+
+	/* Set the background to show the root window to avoid a flash that
+	 * would otherwise occur.
+	 */
+	gtk_widget_set_app_paintable (widget, TRUE);
+	w = GDK_WINDOW_XWINDOW (widget->window);
+	XGetWindowProperty (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
+			    gdk_atom_intern("_XROOTPMAP_ID", FALSE),
+			    0L, 1L, False, XA_PIXMAP,
+			    &type, &format, &nitems, &bytes_after,
+			    &data);
+  
+	if (type == XA_PIXMAP) {
+		if (format == 32 && nitems == 1 && bytes_after == 0) {
+			gdk_error_trap_push ();
+			XSetWindowBackgroundPixmap (GDK_DISPLAY (), w,
+						    *(Pixmap *)data);
+			gdk_flush ();
+			if (!gdk_error_trap_pop ())
+				have_set_background = TRUE;
+		}
+  
+		XFree (data);
+	}
+
+	if (!have_set_background) {
+		XGetWindowProperty (GDK_DISPLAY(), GDK_ROOT_WINDOW(),
+				    gdk_atom_intern("_XROOTCOLOR_PIXEL", FALSE),
+				    0L, 1L, False, AnyPropertyType,
+				    &type, &format, &nitems, &bytes_after,
+				    &data);
+  
+		if (type != None) {
+			if (format == 32 && nitems == 1 && bytes_after == 0) {
+				XSetWindowBackground (GDK_DISPLAY (), w,
+						      *(gulong *)data);
+				have_set_background = TRUE;
+			}
+  
+			XFree (data);
+		}
+	}
+
+	if (!have_set_background) {
+		XSetWindowBackgroundPixmap (GDK_DISPLAY (), w,
+					    None);
+	}
+	
 
 	/* Get rid of the things that window managers add to resize
 	 * and otherwise manipulate the window.