/****************************************************************************

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

#ifndef QPAINTENGINE_P_H

#define QPAINTENGINE_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "QtGui/qpainter.h"

#include "QtGui/qpaintengine.h"

#include "QtGui/qregion.h"

#include "private/qobject_p.h"

QT_BEGIN_NAMESPACE

class QPaintDevice;

class QPaintEnginePrivate

{

    Q_DECLARE_PUBLIC(QPaintEngine)

public:

    QPaintEnginePrivate() : pdev(0), q_ptr(0), currentClipWidget(0), hasSystemTransform(0),

                            hasSystemViewport(0) {}

    virtual ~QPaintEnginePrivate() { }

    QPaintDevice *pdev;

    QPaintEngine *q_ptr;

    QRegion systemClip;

    QRect systemRect;

    QRegion systemViewport;

    QTransform systemTransform;

    QWidget *currentClipWidget;

    uint hasSystemTransform : 1;

    uint hasSystemViewport : 1;

    inline void transformSystemClip()

    {

        if (systemClip.isEmpty())

            return;

        if (hasSystemTransform) {

            if (systemTransform.type() <= QTransform::TxTranslate)

                systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));

            else

                systemClip = systemTransform.map(systemClip);

        }

        // Make sure we're inside the viewport.

        if (hasSystemViewport) {

            systemClip &= systemViewport;

            if (systemClip.isEmpty()) {

                // We don't want to paint without system clip, so set it to 1 pixel :)

                systemClip = QRect(systemViewport.boundingRect().topLeft(), QSize(1, 1));

            }

        }

    }

    inline void setSystemTransform(const QTransform &xform)

    {

        systemTransform = xform;

        if ((hasSystemTransform = !xform.isIdentity()) || hasSystemViewport)

            transformSystemClip();

        systemStateChanged();

    }

    inline void setSystemViewport(const QRegion &region)

    {

        systemViewport = region;

        hasSystemViewport = !systemViewport.isEmpty();

    }

    virtual void systemStateChanged() { }

    void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);

};

QT_END_NAMESPACE

#endif // QPAINTENGINE_P_H