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- /****************************************************************************
- * libs/libnx/nxmu/nx_requestbkgd.c
- *
- * Copyright (C) 2008-2009, 2011-2013, 2017 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
- * 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 <errno.h>
- #include <debug.h>
- #include <nuttx/nx/nx.h>
- #include <nuttx/nx/nxmu.h>
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nx_requestbkgd
- *
- * Description:
- * NX normally controls a separate window called the background window.
- * It repaints the window as necessary using only a solid color fill. The
- * background window always represents the entire screen and is always
- * below other windows. It is useful for an application to control the
- * background window in the following conditions:
- *
- * - If you want to implement a windowless solution. The single screen
- * can be used to creat a truly simple graphic environment.
- * - When you want more on the background than a solid color. For
- * example, if you want an image in the background, or animations in the
- * background, or live video, etc.
- *
- * This API only requests the handle of the background window. That
- * handle will be returned asynchronously in a subsequent position and
- * redraw callbacks.
- *
- *
- * Cautions:
- * - The following should never be called using the background window.
- * They are guaranteed to cause severe crashes:
- *
- * nx_setposition, nx_setsize, nx_raise, nx_lower.
- *
- * - Neither nx_opengbwindow or nx_closebgwindow should be called more than
- * once. Multiple instances of the background window are not supported.
- *
- * Input Parameters:
- * handle - The handle returned by nx_connect
- * cb - Callbacks to use for processing background window events
- * arg - User provided argument (see nx_openwindow, nx_constructwindow)
- *
- * Returned Value:
- * OK: Success; ERROR of failure with errno set appropriately.
- *
- ****************************************************************************/
- int nx_requestbkgd(NXHANDLE handle, FAR const struct nx_callback_s *cb,
- FAR void *arg)
- {
- FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
- struct nxsvrmsg_requestbkgd_s outmsg;
- #ifdef CONFIG_DEBUG_FEATURES
- if (!conn || !cb)
- {
- set_errno(EINVAL);
- return ERROR;
- }
- #endif
- /* Request access to the background window from the server */
- outmsg.msgid = NX_SVRMSG_REQUESTBKGD;
- outmsg.conn = conn;
- outmsg.cb = cb;
- outmsg.arg = arg;
- return nxmu_sendserver(conn, &outmsg, sizeof(struct nxsvrmsg_requestbkgd_s));
- }
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