// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#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/private/qtguiglobal_p.h>

#include "QtGui/qpainter.h"

#include "QtGui/qpaintengine.h"

#include "QtGui/qregion.h"

#include "private/qobject_p.h"

QT_BEGIN_NAMESPACE

class QPaintDevice;

class Q_GUI_EXPORT QPaintEnginePrivate

{

    Q_DECLARE_PUBLIC(QPaintEngine)

public:

    QPaintEnginePrivate() : pdev(nullptr), q_ptr(nullptr), currentClipDevice(nullptr), hasSystemTransform(0),

                            hasSystemViewport(0) {}

    virtual ~QPaintEnginePrivate();

    QPaintDevice *pdev;

    QPaintEngine *q_ptr;

    QRegion baseSystemClip;

    QRegion systemClip;

    QRect systemRect;

    QRegion systemViewport;

    QTransform systemTransform;

    QPaintDevice *currentClipDevice;

    uint hasSystemTransform : 1;

    uint hasSystemViewport : 1;

    inline void updateSystemClip()

    {

        systemClip = baseSystemClip;

        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;

        hasSystemTransform = !xform.isIdentity();

        updateSystemClip();

        if (q_ptr->state)

            systemStateChanged();

    }

    inline void setSystemViewport(const QRegion &region)

    {

        systemViewport = region;

        hasSystemViewport = !systemViewport.isEmpty();

        updateSystemClip();

        if (q_ptr->state)

            systemStateChanged();

    }

    inline void setSystemTransformAndViewport(const QTransform &xform, const QRegion &region)

    {

        systemTransform = xform;

        hasSystemTransform = !xform.isIdentity();

        systemViewport = region;

        hasSystemViewport = !systemViewport.isEmpty();

        updateSystemClip();

        if (q_ptr->state)

            systemStateChanged();

    }

    virtual void systemStateChanged() { }

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

    static QPaintEnginePrivate *get(QPaintEngine *paintEngine) { return paintEngine->d_func(); }

    virtual QPaintEngine *aggregateEngine() { return nullptr; }

    virtual Qt::HANDLE nativeHandle() { return nullptr; }

};

QT_END_NAMESPACE

#endif // QPAINTENGINE_P_H