119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_constructwindow.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 <stdlib.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_constructwindow
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*
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* Description:
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* This function is the same a nx_openwindow EXCEPT that the client
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* provides the window structure instance. nx_constructwindow will
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* initialize the the pre-allocated window structure for use by NX.
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* This function is provided in addition to nx_openwindow in order
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* to support a kind of inheritance: The caller's window structure
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* may include extensions that are not visible to NX.
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*
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* NOTE:
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* hwnd must have been allocated using a user-space allocator that permits
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* user access to the window. Once provided to nx_constructwindow() that
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* memory is owned and managed by NX. On certain error conditions or
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* when the window is closed, NX will free the 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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* hwnd - The pre-allocated window structure.
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* flags - Optional flags. Must be zero unless CONFIG_NX_RAMBACKED is
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* enabled. In that case, it may be zero or
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* NXBE_WINDOW_RAMBACKED
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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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* OK on success; ERROR on failure with errno set appropriately. In the
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* case of ERROR, NX will have deallocated the pre-allocated window.
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*
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****************************************************************************/
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int nx_constructwindow(NXHANDLE handle, NXWINDOW hwnd, 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 nxmu_conn_s *conn = (FAR struct nxmu_conn_s *)handle;
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FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd;
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struct nxsvrmsg_openwindow_s outmsg;
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#ifdef CONFIG_DEBUG_FEATURES
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if (wnd == NULL)
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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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if (conn == NULL || cb == NULL || (flags & ~NXBE_WINDOW_USER) != 0)
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{
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lib_ufree(wnd);
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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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/* Setup only the connection structure, user flags, callbacks and client
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* private data reference. The server will set everything else up.
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*/
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wnd->conn = conn;
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wnd->flags = flags;
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wnd->cb = cb;
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wnd->arg = arg;
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#ifdef CONFIG_NX_RAMBACKED
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#ifdef CONFIG_BUILD_KERNEL
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wnd->npages = 0;
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#endif
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wnd->stride = 0;
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wnd->fbmem = NULL;
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#endif
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/* Request initialization the new window from the server */
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outmsg.msgid = NX_SVRMSG_OPENWINDOW;
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outmsg.wnd = wnd;
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return nxmu_sendserver(conn, &outmsg,
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sizeof(struct nxsvrmsg_openwindow_s));
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}
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