1 files changed, 33 insertions, 0 deletions
diff --git a/nuttx/graphics/nxsu/nxfe.h b/nuttx/graphics/nxsu/nxfe.h
index f0cc076a7..7fd65f2f3 100644
--- a/nuttx/graphics/nxsu/nxfe.h
+++ b/nuttx/graphics/nxsu/nxfe.h
@@ -95,6 +95,39 @@ EXTERN const struct nx_callback_s g_bkgdcb;
  ****************************************************************************/
 
 /****************************************************************************
+ * Name: nxfe_constructwindow
+ *
+ * Description:
+ *   This function is the same a nx_openwindow EXCEPT that the client provides
+ *   the window structure instance.  nx_constructwindow will initialize the
+ *   the pre-allocated window structure for use by NX.  This function is
+ *   provided in addition to nx_open window in order to support a kind of
+ *   inheritance:  The caller's window structure may include extensions that
+ *   are not visible to NX.
+ *
+ *   NOTE:  wnd must have been allocated using malloc() (or related allocators)
+ *   Once provided to nxfe_constructwindow() that memory is owned and managed
+ *   by NX.  On certain error conditions or when the window is closed, NX will
+ *   free() the the window.
+ *
+ * Input Parameters:
+ *   handle - The handle returned by nx_connect
+ *   wnd    - The pre-allocated window structure.
+ *   cb     - Callbacks used to process window events
+ *   arg    - User provided value that will be returned with NX callbacks.
+ *
+ * Return:
+ *   OK on success; ERROR on failure with errno set appropriately.  In the
+ *   case of ERROR, NX will have dealloated the pre-allocated window.
+ *
+ ****************************************************************************/
+
+EXTERN int nxfe_constructwindow(NXHANDLE handle,
+                                FAR struct nxbe_window_s *wnd,
+                                FAR const struct nx_callback_s *cb,
+                                FAR void *arg);
+
+/****************************************************************************
  * Name: nxfe_redrawreq
  *
  * Descripton: