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Diffstat (limited to 'nuttx/graphics/nxmu/nx_requestbkgd.c')
-rw-r--r-- | nuttx/graphics/nxmu/nx_requestbkgd.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/nuttx/graphics/nxmu/nx_requestbkgd.c b/nuttx/graphics/nxmu/nx_requestbkgd.c new file mode 100644 index 000000000..c8f71ab2a --- /dev/null +++ b/nuttx/graphics/nxmu/nx_requestbkgd.c @@ -0,0 +1,136 @@ +/**************************************************************************** + * graphics/nxmu/nx_requestbkgd.c + * + * Copyright (C) 2008-2009, 2011-2012 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 "nxfe.h" + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * 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. In this + * case, you should probably also de-select CONFIG_NX_MULTIUSER as well. + * - 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) + * + * Return: + * 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 + if (!conn || !cb) + { + 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)); +} + |