Add helper rouintes

svn path=/trunk/gtk-sharp/; revision=24064

gdk/Drawable.custom

@@ -26,3 +26,20 @@ public void DrawLines(Gdk.GC gc, Gdk.Point[] points)
 	gdk_draw_lines(Handle, gc.Handle, points, points.Length);
 }
 
+[DllImport("libgdk-win32-2.0-0.dll")]
+internal static extern IntPtr gdk_x11_drawable_get_xdisplay (IntPtr raw);
+
+[DllImport("libgdk-win32-2.0-0.dll")]
+internal static extern IntPtr gdk_x11_drawable_get_xid (IntPtr raw);
+
+#if MANLY_ENOUGH_TO_INCLUDE
+	public virtual Cairo.Graphics CairoGraphics ()
+	{
+		Cairo.Graphics o = new Cairo.Graphics ();
+
+		IntPtr display = gdk_x11_drawable_get_xdisplay (Handle);
+		o.SetTargetDrawable (display, gdk_x11_drawable_get_xid (Handle));
+
+		return o;
+	}
+#endif

gdk/Pixmap.custom

@@ -0,0 +1,9 @@
+//
+// Pixmap extensions
+//
+
+	public Pixmap (Gdk.Drawable drawable, int width, int height)
+	: this (drawable, width, height, -1)
+	{
+	}
+

gdk/Window.custom

@@ -52,3 +52,35 @@
 		}
 	}
 
+	public void MoveResize (Gdk.Rectangle rect) {
+		gdk_window_move_resize (Handle, rect.X, rect.Y, rect.Width, rect.Height);
+	}
+
+	public void ClearArea (Gdk.Rectangle rect, bool expose) {
+		if (expose)
+			gdk_window_clear_area_e (Handle, rect.X, rect.Y, rect.Width, rect.Height);
+		else
+			gdk_window_clear_area (Handle, rect.X, rect.Y, rect.Width, rect.Height);
+	}
+
+#if MANLY_ENOUGH_TO_INCLUDE
+	public Cairo.Graphics CairoGraphics (out int offset_x, out int offset_y)
+	{
+		IntPtr real_drawable;
+		Cairo.Graphics o = new Cairo.Graphics ();
+
+		gdk_window_get_internal_paint_info (Handle, out real_drawable, out offset_x, out offset_y);
+		IntPtr x11 = gdk_x11_drawable_get_xid (real_drawable);
+		IntPtr display = gdk_x11_drawable_get_xdisplay (real_drawable);
+		o.SetTargetDrawable (display, x11);
+
+		return o;
+	}
+
+
+	public override Cairo.Graphics CairoGraphics ()
+	{
+		int x, y;
+		return CairoGraphics (out x, out y);
+	}
+#endif