diff -r 000000000000 -r 6474c204b198 gfx/ipc/SharedDIBWin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/ipc/SharedDIBWin.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* -*- 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_SharedDIBWin_h__
+#define gfx_SharedDIBWin_h__
+
+#include <windows.h>
+
+#include "SharedDIB.h"
+
+namespace mozilla {
+namespace gfx {
+
+class SharedDIBWin : public SharedDIB
+{
+public:
+  SharedDIBWin();
+  ~SharedDIBWin();
+
+  // Allocate a new win32 dib section compatible with an hdc. The dib will
+  // be selected into the hdc on return.
+  nsresult Create(HDC aHdc, uint32_t aWidth, uint32_t aHeight,
+                  bool aTransparent);
+
+  // Wrap a dib section around an existing shared memory object. aHandle should
+  // point to a section large enough for the dib's memory, otherwise this call
+  // will fail.
+  nsresult Attach(Handle aHandle, uint32_t aWidth, uint32_t aHeight,
+                  bool aTransparent);
+
+  // Destroy or release resources associated with this dib.
+  nsresult Close();
+
+  // Return the HDC of the shared dib.
+  HDC GetHDC() { return mSharedHdc; }
+
+  // Return the bitmap bits.
+  void* GetBits() { return mBitmapBits; }
+
+private:
+  HDC                 mSharedHdc;
+  HBITMAP             mSharedBmp;
+  HGDIOBJ             mOldObj;
+  void*               mBitmapBits;
+
+  uint32_t SetupBitmapHeader(uint32_t aWidth, uint32_t aHeight,
+                             bool aTransparent, BITMAPV4HEADER *aHeader);
+  nsresult SetupSurface(HDC aHdc, BITMAPV4HEADER *aHdr);
+};
+
+} // gfx
+} // mozilla
+
+#endif