/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/

#ifndef QSGTEXTURE_H
#define QSGTEXTURE_H

#include <QtQuick/qtquickglobal.h>
#include <QObject>
#include <QImage>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QSGTexturePrivate;
class Q_QUICK_EXPORT QSGTexture : public QObject
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QSGTexture)

public:
    QSGTexture();
    ~QSGTexture();

    enum WrapMode {
        Repeat,
        ClampToEdge
    };

    enum Filtering {
        None,
        Nearest,
        Linear
    };

    virtual int textureId() const = 0;
    virtual QSize textureSize() const = 0;
    virtual bool hasAlphaChannel() const = 0;
    virtual bool hasMipmaps() const = 0;

    virtual QRectF textureSubRect() const;

    virtual bool isAtlasTexture() const;

    virtual QSGTexture *removedFromAtlas() const;

    virtual void bind() = 0;
    void updateBindOptions(bool force = false);

    void setMipmapFiltering(Filtering filter);
    QSGTexture::Filtering mipmapFiltering() const;

    void setFiltering(Filtering filter);
    QSGTexture::Filtering filtering() const;

    void setHorizontalWrapMode(WrapMode hwrap);
    QSGTexture::WrapMode horizontalWrapMode() const;

    void setVerticalWrapMode(WrapMode vwrap);
    QSGTexture::WrapMode verticalWrapMode() const;

    inline QRectF convertToNormalizedSourceRect(const QRectF &rect) const;

protected:
    QSGTexture(QSGTexturePrivate &dd);
};

QRectF QSGTexture::convertToNormalizedSourceRect(const QRectF &rect) const
{
    QSize s = textureSize();
    QRectF r = textureSubRect();

    qreal sx = r.width() / s.width();
    qreal sy = r.height() / s.height();

    return QRectF(r.x() + rect.x() * sx,
                  r.y() + rect.y() * sy,
                  rect.width() * sx,
                  rect.height() * sy);
}


class Q_QUICK_EXPORT QSGDynamicTexture : public QSGTexture
{
    Q_OBJECT
public:
    virtual bool updateTexture() = 0;
};

QT_END_NAMESPACE

QT_END_HEADER

#endif