// 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

#include <private/qtquickglobal_p.h>

QT_REQUIRE_CONFIG(quick_shadereffect);

#include "qqmlparserstatus.h"

#include <QtQuick/qtquickglobal.h>
#include <QtGui/qcolor.h>
#include <QtCore/qobject.h>
#include <QtCore/qsize.h>
#include <QtCore/qvector.h>
#include <QtCore/qbytearray.h>
#include <QtQml/qqml.h>

#ifndef QQUICKSHADEREFFECTMESH_P_H
#define QQUICKSHADEREFFECTMESH_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.
//

QT_BEGIN_NAMESPACE

Q_QUICK_EXPORT const char *qtPositionAttributeName();
Q_QUICK_EXPORT const char *qtTexCoordAttributeName();

class QSGGeometry;
class QRectF;

class Q_QUICK_EXPORT QQuickShaderEffectMesh : public QObject
{
    Q_OBJECT

    QML_NAMED_ELEMENT(ShaderEffectMesh)
    QML_ADDED_IN_VERSION(2, 0)
    QML_UNCREATABLE("Cannot create instance of abstract class ShaderEffectMesh.")

public:
    QQuickShaderEffectMesh(QObject *parent = nullptr);
    virtual bool validateAttributes(const QVector<QByteArray> &attributes, int *posIndex) = 0;
    // If 'geometry' != 0, 'attrCount' is the same as last time the function was called.
    virtual QSGGeometry *updateGeometry(QSGGeometry *geometry, int attrCount, int posIndex,
                                        const QRectF &srcRect, const QRectF &rect) = 0;
    // If updateGeometry() fails, the reason should appear in the log.
    virtual QString log() const { return QString(); }

Q_SIGNALS:
    // Emitted when the geometry needs to be updated.
    void geometryChanged();

protected:
    QQuickShaderEffectMesh(QObjectPrivate &dd, QObject *parent = nullptr);
};

class Q_QUICK_EXPORT QQuickGridMesh : public QQuickShaderEffectMesh
{
    Q_OBJECT
    Q_PROPERTY(QSize resolution READ resolution WRITE setResolution NOTIFY resolutionChanged)
    QML_NAMED_ELEMENT(GridMesh)
    QML_ADDED_IN_VERSION(2, 0)
public:
    QQuickGridMesh(QObject *parent = nullptr);
    bool validateAttributes(const QVector<QByteArray> &attributes, int *posIndex) override;
    QSGGeometry *updateGeometry(QSGGeometry *geometry, int attrCount, int posIndex,
                                const QRectF &srcRect, const QRectF &rect) override;
    QString log() const  override { return m_log; }

    void setResolution(const QSize &res);
    QSize resolution() const;

Q_SIGNALS:
    void resolutionChanged();

private:
    QSize m_resolution;
    QString m_log;
};

class QQuickScaleGrid;
class QQuickBorderImageMesh : public QQuickShaderEffectMesh
{
    Q_OBJECT

    Q_PROPERTY(QQuickScaleGrid *border READ border CONSTANT)
    Q_PROPERTY(QSize size READ size WRITE setSize NOTIFY sizeChanged)
    Q_PROPERTY(TileMode horizontalTileMode READ horizontalTileMode WRITE setHorizontalTileMode NOTIFY horizontalTileModeChanged)
    Q_PROPERTY(TileMode verticalTileMode READ verticalTileMode WRITE setVerticalTileMode NOTIFY verticalTileModeChanged)

    QML_NAMED_ELEMENT(BorderImageMesh)
    QML_ADDED_IN_VERSION(2, 8)

public:
    QQuickBorderImageMesh(QObject *parent = nullptr);

    bool validateAttributes(const QVector<QByteArray> &attributes, int *posIndex) override;
    QSGGeometry *updateGeometry(QSGGeometry *geometry, int attrCount, int posIndex,
                                const QRectF &srcRect, const QRectF &rect) override;

    QQuickScaleGrid *border() const;

    enum TileMode { Stretch = Qt::StretchTile, Repeat = Qt::RepeatTile, Round = Qt::RoundTile };
    Q_ENUM(TileMode)

    QSize size() const;
    void setSize(const QSize &size);

    TileMode horizontalTileMode() const;
    void setHorizontalTileMode(TileMode);

    TileMode verticalTileMode() const;
    void setVerticalTileMode(TileMode);

Q_SIGNALS:
    void sizeChanged();
    void horizontalTileModeChanged();
    void verticalTileModeChanged();

private:
    QQuickScaleGrid *m_border;
    QSize m_size;
    TileMode m_horizontalTileMode;
    TileMode m_verticalTileMode;
};

inline QColor qt_premultiply_color(const QColor &c)
{
    float r, g, b, a;
    c.getRgbF(&r, &g, &b, &a);
    return QColor::fromRgbF(r * a, g * a, b * a, a);
}


QT_END_NAMESPACE

#endif // QQUICKSHADEREFFECTMESH_P_H
