author Gregory Szorc <>
Wed, 28 Jan 2015 13:37:00 -0800
changeset 110573 4bdd1d184a238649a98c3aba846161bbe9294587
parent 108463 a16372ce30b5f6b747246b01fcd215a4bf3b6342
permissions -rw-r--r--
Close old release branch GECKO1708esr_2013080515_RELBRANCH

/* -*- 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 */

#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
  typedef base::SharedMemoryHandle Handle;


  // 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);

  base::SharedMemory *mShMem;

} // gfx
} // mozilla