gfx/ipc/SharedDIB.h
author Randell Jesup <rjesup@jesup.org>
Fri, 29 May 2015 10:14:14 -0400
changeset 246329 eefcbe8e6a0cb28ebc739d4b40f8a066bdf529f0
parent 236994 aee0f61516c53778dba9c97c6cbd5c35750902e3
child 252629 91d6e262b662a0b4e47358665e222d3927337af9
permissions -rw-r--r--
Bug 1109338: Part 2: Sharing UDPSocket between PNecko and PBackground r=bent

/* -*- 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 "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::ProcessId aTargetPid, Handle *aNewHandle);

protected:
  base::SharedMemory *mShMem;
};

} // gfx
} // mozilla

#endif