gecko/gfx/ipc/SharedDIB.cpp

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/* -*- 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 ***** */
#include "SharedDIB.h"
namespace mozilla {
namespace gfx {
SharedDIB::SharedDIB() :
mShMem(nsnull)
{
}
SharedDIB::~SharedDIB()
{
Close();
}
nsresult
SharedDIB::Create(PRUint32 aSize)
{
Close();
mShMem = new base::SharedMemory();
if (!mShMem || !mShMem->Create("", false, false, aSize))
return NS_ERROR_OUT_OF_MEMORY;
// Map the entire section
if (!mShMem->Map(0))
return NS_ERROR_FAILURE;
return NS_OK;
}
bool
SharedDIB::IsValid()
{
if (!mShMem)
return false;
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return mShMem->IsHandleValid(mShMem->handle());
}
nsresult
SharedDIB::Close()
{
if (mShMem)
delete mShMem;
mShMem = nsnull;
return NS_OK;
}
nsresult
SharedDIB::Attach(Handle aHandle, PRUint32 aSize)
{
Close();
mShMem = new base::SharedMemory(aHandle, false);
if(!mShMem)
return NS_ERROR_OUT_OF_MEMORY;
if (!mShMem->Map(aSize))
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
SharedDIB::ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle)
{
if (!mShMem)
return NS_ERROR_UNEXPECTED;
if (!mShMem->ShareToProcess(aChildProcess, aChildHandle))
return NS_ERROR_UNEXPECTED;
return NS_OK;
}
} // gfx
} // mozilla