gfx/ipc/SharedDIBSurface.h
author Karl Tomlinson <karlt+@karlt.net>
Thu, 03 Feb 2011 12:22:09 -0500
changeset 61852 9a9f6f3eec6ba9acb0249e3d8e4310770c40d59d
parent 57212 37188e297b073acf5d8319dddf5e8c1aa15722f3
child 70214 3ce0d40d9ebaec16fb80c9a1e60a1f9d2e90ebad
permissions -rw-r--r--
b=621962 don't realize unnecessary windows for stock image widget r=roc

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
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 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is Mozilla Firefox.
 *
 * The Initial Developer of the Original Code is
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#ifndef mozilla_gfx_SharedDIBSurface_h
#define mozilla_gfx_SharedDIBSurface_h

#include "gfxImageSurface.h"
#include "SharedDIBWin.h"

#include <windows.h>

namespace mozilla {
namespace gfx {

/**
 * A SharedDIBSurface owns an underlying SharedDIBWin.
 */
class SharedDIBSurface : public gfxImageSurface
{
public:
  typedef base::SharedMemoryHandle Handle;

  SharedDIBSurface() { }
  ~SharedDIBSurface() { }

  /**
   * Create this image surface backed by shared memory.
   */
  bool Create(HDC adc, PRUint32 aWidth, PRUint32 aHeight, bool aTransparent);

  /**
   * Attach this surface to shared memory from another process.
   */
  bool Attach(Handle aHandle, PRUint32 aWidth, PRUint32 aHeight,
              bool aTransparent);

  /**
   * After drawing to a surface via GDI, GDI must be flushed before the bitmap
   * is valid.
   */
  void Flush() { ::GdiFlush(); }

  HDC GetHDC() { return mSharedDIB.GetHDC(); }

  nsresult ShareToProcess(base::ProcessHandle aChildProcess, Handle* aChildHandle) {
    return mSharedDIB.ShareToProcess(aChildProcess, aChildHandle);
  }

  static bool IsSharedDIBSurface(gfxASurface* aSurface);

private:
  SharedDIBWin mSharedDIB;

  void InitSurface(PRUint32 aWidth, PRUint32 aHeight, bool aTransparent);
};

} // namespace gfx
} // namespace mozilla

#endif // mozilla_gfx_SharedDIBSurface_h