115 lines
4.5 KiB
C
115 lines
4.5 KiB
C
/****************************************************************************
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* libnx/nxmu/nx_requestbkgd.c
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*
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* Copyright (C) 2008-2009, 2011-2013, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxmu.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_requestbkgd
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*
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* Description:
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* NX normally controls a separate window called the background window.
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* It repaints the window as necessary using only a solid color fill. The
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* background window always represents the entire screen and is always
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* below other windows. It is useful for an application to control the
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* background window in the following conditions:
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*
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* - If you want to implement a windowless solution. The single screen
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* can be used to creat a truly simple graphic environment.
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* - When you want more on the background than a solid color. For
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* example, if you want an image in the background, or animations in the
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* background, or live video, etc.
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*
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* This API only requests the handle of the background window. That
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* handle will be returned asynchronously in a subsequent position and
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* redraw callbacks.
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*
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*
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* Cautions:
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* - The following should never be called using the background window.
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* They are guaranteed to cause severe crashes:
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*
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* nx_setposition, nx_setsize, nx_raise, nx_lower.
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*
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* - Neither nx_opengbwindow or nx_closebgwindow should be called more than
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* once. Multiple instances of the background window are not supported.
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*
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* Input Parameters:
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* handle - The handle returned by nx_connect
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* cb - Callbacks to use for processing background window events
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* arg - User provided argument (see nx_openwindow, nx_constructwindow)
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*
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* Returned Value:
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* OK: Success; ERROR of failure with errno set appropriately.
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*
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****************************************************************************/
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int nx_requestbkgd(NXHANDLE handle, FAR const struct nx_callback_s *cb,
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FAR void *arg)
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{
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FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
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struct nxsvrmsg_requestbkgd_s outmsg;
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#ifdef CONFIG_DEBUG_FEATURES
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if (!conn || !cb)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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#endif
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/* Request access to the background window from the server */
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outmsg.msgid = NX_SVRMSG_REQUESTBKGD;
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outmsg.conn = conn;
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outmsg.cb = cb;
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outmsg.arg = arg;
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return nxmu_sendserver(conn, &outmsg, sizeof(struct nxsvrmsg_requestbkgd_s));
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}
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