/* ============================================================
 *
 * This file is a part of kipi-plugins project
 * http://www.digikam.org
 *
 * Date        : 2011-09-01
 * Description : a plugin to create photo layouts by fusion of several images.
 * Acknowledge : based on the expoblending plugin
 *
 * Copyright (C) 2011 by Łukasz Spas <lukasz dot spas at gmail dot com>
 * Copyright (C) 2009-2011 by Gilles Caulier <caulier dot gilles 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 GRAYSCALEPHOTOEFFECT_P_H
#define GRAYSCALEPHOTOEFFECT_P_H

#include "AbstractPhotoEffectInterface.h"

namespace KIPIPhotoLayoutsEditor
{
    class StandardEffectsFactory;
    class GrayscalePhotoEffect : public AbstractPhotoEffectInterface
    {
            Q_OBJECT

        public:

            explicit GrayscalePhotoEffect(StandardEffectsFactory * factory, QObject * parent = 0);
            virtual QImage apply(const QImage & image) const;
            virtual QString name() const;
            virtual QString toString() const;
            virtual operator QString() const;

        private:

            static inline QImage greyscaled(const QImage & image)
            {
                QImage result = image;
                unsigned int pixels = result.width() * result.height();
                unsigned int * data = reinterpret_cast<unsigned int *>(result.bits());
                for (unsigned int i = 0; i < pixels; ++i)
                {
                    int val = qGray(data[i]);
                    data[i] = qRgb(val,val,val);
                }
                return result;
            }

        friend class StandardEffectsFactory;
    };
}

#endif // GRAYSCALEPHOTOEFFECT_P_H
