/****************************************************************************
**
** Copyright (C) 2016 Jolla Ltd, author: <gunnar.sletta@jollamobile.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Graphical Effects module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
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** accordance with the commercial license agreement provided with the
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** a written agreement between you and The Qt Company. For licensing terms
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** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
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** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
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****************************************************************************/

#ifndef QGFXSOURCEPROXY_P_H
#define QGFXSOURCEPROXY_P_H

#include <QtQuick/QQuickItem>

QT_BEGIN_NAMESPACE

class QQuickShaderEffectSource;

class QGfxSourceProxy : public QQuickItem
{
    Q_OBJECT

    Q_PROPERTY(QQuickItem *input READ input WRITE setInput NOTIFY inputChanged RESET resetInput)
    Q_PROPERTY(QQuickItem *output READ output NOTIFY outputChanged)
    Q_PROPERTY(QRectF sourceRect READ sourceRect WRITE setSourceRect NOTIFY sourceRectChanged)

    Q_PROPERTY(bool active READ isActive NOTIFY activeChanged)
    Q_PROPERTY(Interpolation interpolation READ interpolation WRITE setInterpolation NOTIFY interpolationChanged)

    Q_ENUMS(Interpolation)

public:
    enum Interpolation {
        AnyInterpolation,
        NearestInterpolation,
        LinearInterpolation
    };

    QGfxSourceProxy(QQuickItem *item = 0);
    ~QGfxSourceProxy();

    QQuickItem *input() const { return m_input; }
    void setInput(QQuickItem *input);
    void resetInput() { setInput(0); }

    QQuickItem *output() const { return m_output; }

    QRectF sourceRect() const { return m_sourceRect; }
    void setSourceRect(const QRectF &sourceRect);

    bool isActive() const { return m_output && m_output != m_input; }

    void setInterpolation(Interpolation i);
    Interpolation interpolation() const { return m_interpolation; }

protected:
    void updatePolish() override;

signals:
    void inputChanged();
    void outputChanged();
    void sourceRectChanged();
    void activeChanged();
    void interpolationChanged();

private slots:
    void repolish();

private:
    void setOutput(QQuickItem *output);
    void useProxy();
    static QObject *findLayer(QQuickItem *);

    QRectF m_sourceRect;
    QQuickItem *m_input;
    QQuickItem *m_output;
    QQuickShaderEffectSource *m_proxy;

    Interpolation m_interpolation;
};

QT_END_NAMESPACE

#endif // QGFXSOURCEPROXY_P_H