gfx/ipc/SharedDIB.h
author Ehsan Akhgari <ehsan@mozilla.com>
Thu, 27 Sep 2012 10:24:08 -0400
changeset 108299 d3d022bd1443dc4a370f8c7add006b0aff2b00bc
parent 108297 24f4f77fba76d09dbea8dab6aa0c269b7ccb50e5
child 108345 519f41fa596f7e3ef09ea28f28ffcad390e45c01
permissions -rw-r--r--
Backout changeset 24f4f77fba76 (bug 793408) because of broken builds on a CLOSED TREE

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#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(uint32_t 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, uint32_t aSize);

  // Returns a SharedMemoryHandle suitable for sharing with another process.
  nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle *aChildHandle);

protected:
  base::SharedMemory *mShMem;
};

} // gfx
} // mozilla

#endif