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diff --git a/nuttx/graphics/nxtk/nxtk_containerclip.c b/nuttx/graphics/nxtk/nxtk_containerclip.c
new file mode 100644
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+++ b/nuttx/graphics/nxtk/nxtk_containerclip.c
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+/****************************************************************************
+ * graphics/nxtk/nxtk_containerclip.c
+ *
+ *   Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/nx/nx.h>
+#include <nuttx/nx/nxtk.h>
+
+#include "nxfe.h"
+#include "nxtk_internal.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxtk_containerclip
+ *
+ * Description:
+ *   We are given a 'src' rectangle in containing window, relative coordinates
+ *   (i.e., (0,0) is the top left corner of the outer, containing window).
+ *   This function will (1) clip that src rectangle so that it lies within
+ *   the sub-window bounds, and then (2) move the rectangle to that it is
+ *   relative to the sub-window (i.e., (0,0) is the top left corner of the
+ *   sub-window).
+ *
+ * Input parameters:
+ *   fwnd   - The framed window to be used
+ *   dest   - The locaton to put the result
+ *   src    - The src rectangle in relative container-window coordinates
+ *   bounds - The subwindow bounds in absolute screen coordinates.
+ *
+ * Returned value:
+ *   None
+ *
+ ****************************************************************************/
+
+void nxtk_containerclip(FAR struct nxtk_framedwindow_s *fwnd,
+                        FAR struct nxgl_rect_s *dest,
+                        FAR const struct nxgl_rect_s *src,
+                        FAR const struct nxgl_rect_s *bounds)
+{
+  struct nxgl_rect_s relbounds;
+
+  /* The 'src' rectangle is relative to the containing window. Convert
+   * the sub-window to the same origin.
+   */
+
+  nxgl_rectoffset(&relbounds, bounds, -fwnd->wnd.bounds.pt1.x,
+                  -fwnd->wnd.bounds.pt1.y);
+
+  /* The interection then leaves the portion of the containing window that
+   * needs to be updated window that needs to be updated.
+   */
+
+  nxgl_rectintersect(dest, src, &relbounds);
+
+  /* Offset this so that is relative to client subwindow origin */
+
+  nxgl_rectoffset(dest, dest, fwnd->wnd.bounds.pt1.x - bounds->pt1.x,
+                  fwnd->wnd.bounds.pt1.y - bounds->pt1.y);
+}