gecko/widget/src/shared/nsShmImage.h

/* -*- 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 the Mozilla browser.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Chris Jones <jones.chris.g@gmail.com>
 *   Oleg Romashin <romaxa@gmail.com>
 *
 * 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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 * ***** END LICENSE BLOCK ***** */

#ifndef __mozilla_widget_nsShmImage_h__
#define __mozilla_widget_nsShmImage_h__

#ifdef MOZ_IPC
#  include "mozilla/ipc/SharedMemorySysV.h"
#endif

#if defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
#  define MOZ_HAVE_SHMIMAGE
#endif

#ifdef MOZ_HAVE_SHMIMAGE

#include "nsIWidget.h"
#include "gfxASurface.h"

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>

#if defined(MOZ_WIDGET_GTK2)
#define DISPLAY gdk_x11_get_default_xdisplay
#elif defined(MOZ_WIDGET_QT)
#include "QX11Info"
#define DISPLAY QX11Info().display
#endif

class QRect;
class QWidget;

class nsShmImage {
    NS_INLINE_DECL_REFCOUNTING(nsShmImage)

    typedef mozilla::ipc::SharedMemorySysV SharedMemorySysV;

public:
    typedef gfxASurface::gfxImageFormat Format;

    static PRBool UseShm();
    static already_AddRefed<nsShmImage>
        Create(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth);
    static already_AddRefed<gfxASurface>
        EnsureShmImage(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth,
                       nsRefPtr<nsShmImage>& aImage);

    ~nsShmImage() {
        if (mImage) {
            XSync(DISPLAY(), False);
            if (mXAttached) {
                XShmDetach(DISPLAY(), &mInfo);
            }
            XDestroyImage(mImage);
        }
    }

    already_AddRefed<gfxASurface> AsSurface();

#if defined(MOZ_WIDGET_GTK2)
    void Put(GdkWindow* aWindow, GdkRectangle* aRects, GdkRectangle* aEnd);
#elif defined(MOZ_WIDGET_QT)
    void Put(QWidget* aWindow, QRect& aRect);
#endif

    gfxIntSize Size() const { return mSize; }

private:
    nsShmImage()
        : mImage(nsnull)
        , mXAttached(PR_FALSE)
    { mInfo.shmid = SharedMemorySysV::NULLHandle(); }

    nsRefPtr<SharedMemorySysV>   mSegment;
    XImage*                      mImage;
    XShmSegmentInfo              mInfo;
    gfxIntSize                   mSize;
    Format                       mFormat;
    PRPackedBool                 mXAttached;
};

#endif // MOZ_HAVE_SHMIMAGE

#endif