shearfilter.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2005-07-18
 * Description : Shear tool threaded image filter.
 *
 * Copyright (C) 2005-2022 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_SHEAR_FILTER_H
#define DIGIKAM_SHEAR_FILTER_H
 
// Qt includes
 
#include <QSize>
#include <QColor>
 
// Local includes
 
#include "digikam_export.h"
#include "dimgthreadedfilter.h"
#include "digikam_globals.h"
 
namespace Digikam
{
 
class DIGIKAM_EXPORT ShearFilter : public DImgThreadedFilter
{
    Q_OBJECT
 
public:
 
    explicit ShearFilter(QObject* const parent = nullptr);
    explicit ShearFilter(DImg* const orgImage, QObject* const parent = nullptr, float hAngle=0.0, float vAngle=0.0,
                         bool antialiasing=true, const QColor& backgroundColor=Qt::black, int orgW=0, int orgH=0);
    ~ShearFilter() override;
 
    QSize getNewSize() const;
 
    static QString          FilterIdentifier()
    {
        return QLatin1String("digikam:ShearFilter");
    }
 
    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;
 
    inline int setPosition (int Width, int X, int Y)
    {
        return (Y*Width*4 + 4*X);
    };
 
    inline bool isInside (int Width, int Height, int X, int Y)
    {
        bool bIsWOk = ((X < 0) ? false : (X >= Width ) ? false : true);
        bool bIsHOk = ((Y < 0) ? false : (Y >= Height) ? false : true);
 
        return (bIsWOk && bIsHOk);
    };
 
private:
 
    class Private;
    Private* const d;
};
 
} // namespace Digikam
 
#endif // DIGIKAM_SHEAR_FILTER_H