/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2010-25-02
 * Description : Levels image filter
 *
 * Copyright (C) 2010-2020 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2010      by Martin Klapetek <martin dot klapetek at gmail dot com>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * ============================================================ */

#ifndef DIGIKAM_LEVELS_FILTER_H
#define DIGIKAM_LEVELS_FILTER_H

// Local includes

#include "digikam_export.h"
#include "dimgthreadedfilter.h"
#include "digikam_globals.h"

namespace Digikam
{

class DImg;

class DIGIKAM_EXPORT LevelsContainer
{

public:

    explicit LevelsContainer()
    {
        for (int i = 0 ; i < 5 ; ++i)
        {
            lInput[i]  = 0;
            hInput[i]  = 65535;
            lOutput[i] = 0;
            hOutput[i] = 65535;
            gamma[i]   = 1.0;
        }
    };

    ~LevelsContainer()
    {
    };

public:

    int    lInput[5];
    int    hInput[5];
    int    lOutput[5];
    int    hOutput[5];

    double gamma[5];
};

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

class DIGIKAM_EXPORT LevelsFilter : public DImgThreadedFilter
{
    Q_OBJECT

public:

    explicit LevelsFilter(QObject* const parent = nullptr);
    explicit LevelsFilter(DImg* const orgImage,
                          QObject* const parent=nullptr,
                          const LevelsContainer& settings=LevelsContainer());
    explicit LevelsFilter(const LevelsContainer& settings,
                          DImgThreadedFilter* const master,
                          const DImg& orgImage,
                          DImg& destImage,
                          int progressBegin=0,
                          int progressEnd=100);
    ~LevelsFilter() override;

    static QString          FilterIdentifier()
    {
        return QLatin1String("digikam:LevelsFilter");
    }

    static QString          DisplayableName();

    static QList<int>       SupportedVersions()
    {
        return QList<int>() << 1;
    }

    static int              CurrentVersion()
    {
        return 1;
    }

    QString         filterIdentifier() const override
    {
        return FilterIdentifier();
    }

    FilterAction    filterAction() override;
    void                    readParameters(const FilterAction& action) override;

private:

    void filterImage() override;

private:

    LevelsContainer m_settings;
};

} // namespace Digikam

#endif // DIGIKAM_LEVELS_FILTER_H
