gecko-dev/gfx/ipc/SharedDIB.h

83 lines
2.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jim Mathies <jmathies@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef gfx_SharedDIB_h__
#define gfx_SharedDIB_h__
#include "base/shared_memory.h"
#include "prtypes.h"
#include "nscore.h"
namespace mozilla {
namespace gfx {
class SharedDIB
{
public:
typedef base::SharedMemoryHandle Handle;
public:
SharedDIB();
~SharedDIB();
// Create and allocate a new shared dib.
nsresult Create(PRUint32 aSize);
// Destroy or release resources associated with this dib.
nsresult Close();
// Returns true if this object contains a valid dib.
bool IsValid();
// Wrap a new shared dib around allocated shared memory. Note aHandle must point
// to a memory section large enough to hold a dib of size aSize, otherwise this
// will fail.
nsresult Attach(Handle aHandle, PRUint32 aSize);
// Returns a SharedMemoryHandle suitable for sharing with another process.
nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle);
protected:
base::SharedMemory *mShMem;
};
} // gfx
} // mozilla
#endif