lensdistortionpixelaccess.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2004-12-27
 * Description : access pixels method for lens distortion algorithm.
 *
 * Copyright (C) 2004-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2006-2010 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 DIGIKAM_LENS_DISTORTION_PIXEL_ACCESS_H
#define DIGIKAM_LENS_DISTORTION_PIXEL_ACCESS_H
 
#define LensDistortionPixelAccessRegions 20
#define LensDistortionPixelAccessWidth   40
#define LensDistortionPixelAccessHeight  20
#define LensDistortionPixelAccessXOffset 3
#define LensDistortionPixelAccessYOffset 3
 
// Local includes
 
#include "dimg.h"
#include "digikam_export.h"
 
namespace Digikam
{
 
class DIGIKAM_EXPORT LensDistortionPixelAccess
{
 
public:
 
    explicit LensDistortionPixelAccess(DImg* srcImage);
    ~LensDistortionPixelAccess();
 
    void pixelAccessGetCubic(double srcX, double srcY, double brighten, uchar* dst);
 
protected:
 
    inline uchar* pixelAccessAddress(int i, int j);
    void pixelAccessSelectRegion(int n);
    void pixelAccessDoEdge(int i, int j);
    void pixelAccessReposition(int xInt, int yInt);
    void cubicInterpolate(uchar* src, int rowStride, uchar* dst,
                          bool sixteenBit, double dx, double dy, double brighten);
 
private:
 
    DImg* m_image;
 
    DImg* m_buffer[LensDistortionPixelAccessRegions];
 
    int   m_width;
    int   m_height;
    int   m_depth;
    int   m_imageWidth;
    int   m_imageHeight;
    bool  m_sixteenBit;
    int   m_tileMinX[LensDistortionPixelAccessRegions];
    int   m_tileMaxX[LensDistortionPixelAccessRegions];
    int   m_tileMinY[LensDistortionPixelAccessRegions];
    int   m_tileMaxY[LensDistortionPixelAccessRegions];
};
 
} // namespace Digikam
 
#endif // DIGIKAM_LENS_DISTORTION_PIXEL_ACCESS_H