/****************************************************************************
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/

#ifndef QPLATFORMBACKINGSTORE_QPA_H
#define QPLATFORMBACKINGSTORE_QPA_H

#include <QtCore/qrect.h>

#include <QtGui/qwindow.h>
#include <QtGui/qregion.h>

QT_BEGIN_NAMESPACE

class QRegion;
class QRect;
class QPoint;
class QImage;
class QPlatformBackingStorePrivate;
class QPlatformWindow;

class Q_GUI_EXPORT QPlatformBackingStore
{
public:
    QPlatformBackingStore(QWindow *window);
    virtual ~QPlatformBackingStore();

    QWindow *window() const;

    virtual QPaintDevice *paintDevice() = 0;

    // 'window' can be a child window, in which case 'region' is in child window coordinates and
    // offset is the (child) window's offset in relation to the window surface.
    virtual void flush(QWindow *window, const QRegion &region, const QPoint &offset) = 0;

    virtual void resize(const QSize &size, const QRegion &staticContents) = 0;

    virtual bool scroll(const QRegion &area, int dx, int dy);

    virtual void beginPaint(const QRegion &);
    virtual void endPaint();

private:
    QPlatformBackingStorePrivate *d_ptr;
};

QT_END_NAMESPACE

#endif // QPLATFORMBACKINGSTORE_QPA_H