103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_openwindow.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/nxbe.h>
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#include <nuttx/nx/nxmu.h>
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#include "nxcontext.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_openwindow
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*
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* Description:
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* Create a new window.
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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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* flags - Optional flags. These include:
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* NXBE_WINDOW_RAMBACKED: Creates a RAM backed window. This
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* option is only valid if CONFIG_NX_RAMBACKED is enabled.
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* NXBE_WINDOW_HIDDEN: The window is create in the HIDDEN state
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* and can be made visible later with nx_setvisibility().
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* cb - Callbacks used to process window events
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* arg - User provided value that will be returned with NX callbacks.
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*
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* Returned Value:
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* Success: A non-NULL handle used with subsequent NX accesses
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* Failure: NULL is returned and errno is set appropriately
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*
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****************************************************************************/
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NXWINDOW nx_openwindow(NXHANDLE handle, uint8_t flags,
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FAR const struct nx_callback_s *cb, FAR void *arg)
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{
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FAR struct nxbe_window_s *wnd;
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int ret;
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#ifdef CONFIG_DEBUG_FEATURES
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if (handle == NULL || cb == NULL || (flags & ~NX_WINDOW_USER) != 0)
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{
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set_errno(EINVAL);
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return NULL;
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}
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#endif
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/* Pre-allocate the window structure */
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wnd = (FAR struct nxbe_window_s *)
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lib_uzalloc(sizeof(struct nxbe_window_s));
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if (!wnd)
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{
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set_errno(ENOMEM);
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return NULL;
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}
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/* Then let nx_constructwindow do the rest */
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ret = nx_constructwindow(handle, (NXWINDOW)wnd, flags, cb, arg);
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if (ret < 0)
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{
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/* An error occurred, the window has been freed */
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return NULL;
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}
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/* Return the uninitialized window reference. Since the server
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* serializes all operations, we can be assured that the window will
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* be initialized before the first operation on the window.
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*/
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return (NXWINDOW)wnd;
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}
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