incubator-nuttx/graphics/nxmu/nxmu_releasebkgd.c

/****************************************************************************
 * graphics/nxmu/nxmu_releasebkgd.c
 *
 *   Copyright (C) 2008-2009, 2011, 2019 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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
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 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <assert.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/nx/nx.h>
#include "nxmu.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nxmu_releasebkgd
 *
 * Description:
 *   Release the background window previously acquired using nxmu_openbgwindow
 *   and return control of the background to NX.
 *
 * Input Parameters:
 *   nxmu - The NXMU state structure
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

void nxmu_releasebkgd(FAR struct nxmu_state_s *nxmu)
{
  FAR struct nxbe_state_s *be;

  DEBUGASSERT(nxmu != NULL);

  /* Destroy the client window callbacks and restore the server connection. */

  be            = &nxmu->be;
  be->bkgd.cb   = NULL;
  be->bkgd.arg  = NULL;
  be->bkgd.conn = &nxmu->conn;

  /* Redraw the background window */

  nxmu_redraw(&be->bkgd, &be->bkgd.bounds);
}