gfx/ipc/SharedDIBSurface.h
author Gregory Szorc <gps@mozilla.com>
Wed, 28 Jan 2015 13:37:00 -0800
branchGECKO140_2012060421_RELBRANCH
changeset 120194 435e31508f3c76fd2038e910012cb946b515e31c
parent 70729 3ce0d40d9ebaec16fb80c9a1e60a1f9d2e90ebad
child 98529 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Close old release branch GECKO140_2012060421_RELBRANCH

/* -*- 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,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Firefox.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation <http://www.mozilla.org>.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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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