diff -r 000000000000 -r 6474c204b198 gfx/ipc/SharedDIB.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/ipc/SharedDIB.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,48 @@
+/* -*- 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::ProcessHandle aChildProcess, Handle *aChildHandle);
+
+protected:
+  base::SharedMemory *mShMem;
+};
+
+} // gfx
+} // mozilla
+
+#endif