metaengine_rotation.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2006-09-15
 * Description : Exiv2 library interface.
 *               Tools for combining rotation operations.
 *
 * Copyright (C) 2006-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2006-2013 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 *
 * 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 META_ENGINE_ROTATION_H
#define META_ENGINE_ROTATION_H
 
// Qt includes
 
#include <QTransform>
 
// Local includes
 
#include "digikam_export.h"
#include "metaengine.h"
 
namespace Digikam
{
 
class DIGIKAM_EXPORT MetaEngineRotation
{
 
public:
 
    enum TransformationAction
    {
        NoTransformation = 0, 
        FlipHorizontal   = 1, 
        FlipVertical     = 2, 
        Rotate90         = 5, 
        Rotate180        = 6, 
        Rotate270        = 7  
    };
 
public:
 
    MetaEngineRotation();
 
    explicit MetaEngineRotation(TransformationAction action);
 
    explicit MetaEngineRotation(MetaEngine::ImageOrientation exifOrientation);
 
    bool operator==(const MetaEngineRotation& ma)   const;
    bool operator!=(const MetaEngineRotation& ma)   const;
 
    bool isNoTransform()                            const;
 
    MetaEngineRotation& operator*=(const MetaEngineRotation& ma);
 
    MetaEngineRotation& operator*=(TransformationAction action);
 
    MetaEngineRotation& operator*=(QList<TransformationAction> actions);
 
    MetaEngineRotation& operator*=(MetaEngine::ImageOrientation exifOrientation);
 
    MetaEngineRotation(int m11, int m12, int m21, int m22);
 
    QList<TransformationAction> transformations()   const;
 
    MetaEngine::ImageOrientation exifOrientation()  const;
 
    QTransform toTransform()                              const;
 
    static QTransform toTransform(MetaEngine::ImageOrientation orientation);
 
protected:
 
    void set(int m11, int m12, int m21, int m22);
 
protected:
 
    int m[2][2];
};
 
} // namespace Digikam
 
#endif // META_ENGINE_ROTATION_H