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qbackingstore_p.h

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QBACKINGSTORE_P_H
#define QBACKINGSTORE_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "private/qpaintengine_raster_p.h"

class QWindowSurface;

class QWidgetBackingStore
{
public:
    QWidgetBackingStore(QWidget *t);
    ~QWidgetBackingStore();
    void bltRect(const QRect &rect, int dx, int dy, QWidget *widget);
    void dirtyRegion(const QRegion &rgn, QWidget *widget=0);
    void cleanRegion(const QRegion &rgn, QWidget *widget=0, bool recursiveCopyToScreen = true);
#if defined (Q_WS_QWS) || defined (Q_WS_WIN)
    void releaseBuffer();
#endif

    inline QPoint topLevelOffset() const { return tlwOffset; }
    static bool paintOnScreen(QWidget * = 0);
    static void copyToScreen(QWidget *, const QRegion &);
#ifdef Q_WS_WIN
    static void blitToScreen(const QRegion &rgn, QWidget *w);
#endif
private:
    QWidget *tlw;
    QRegion dirty;

    QWindowSurface *windowSurface;

    QPoint tlwOffset;

    static bool isOpaque(const QWidget *widget);

    void copyToScreen(const QRegion &rgn, QWidget *widget, const QPoint &offset, bool recursive = true);

    static void paintSiblingsRecursive(QPaintDevice *pdev, const QObjectList& children, int index, const QRegion &rgn, const QPoint &offset, int flags);

    friend void qt_syncBackingStore(QRegion, QWidget *);
#if defined(Q_WS_X11) || defined(Q_WS_QWS)
    friend void qt_syncBackingStore(QWidget *);
#endif
    friend class QWidgetPrivate;
    friend class QWidget;
    friend class QWSManagerPrivate;
    friend class QETWidget;
};

#endif // QBACKINGSTORE_P_H

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