filter_backward_difference.hpp

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/*

PICCANTE
The hottest HDR imaging library!
http://vcg.isti.cnr.it/piccante

Copyright (C) 2014
Visual Computing Laboratory - ISTI CNR
http://vcg.isti.cnr.it
First author: Francesco Banterle

This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at http://mozilla.org/MPL/2.0/.

*/

#ifndef PIC_FILTERING_FILTER_BACKWARD_DIFFERENCE_HPP
#define PIC_FILTERING_FILTER_BACKWARD_DIFFERENCE_HPP

#include "../filtering/filter.hpp"

namespace pic {

class FilterBackwardDifference: public Filter
{
protected:

    void f(FilterFData *data)
    {
        float *in   = (*data->src[0])(data->x,     data->y);
        float *inXm = (*data->src[0])(data->x + 1, data->y);
        float *inYm = (*data->src[0])(data->x,     data->y + 1);

        for(int k = 0; k < data->dst->channels; k++) {
            int tmp = k << 1;
            data->out[tmp  ]   = inXm[k] - in[k];
            data->out[tmp + 1] = inYm[k] - in[k];
        }
    }

public:
    FilterBackwardDifference() : Filter()
    {

    }

    void OutputSize(ImageVec imgIn, int &width, int &height, int &channels, int &frames)
    {
        width       = imgIn[0]->width;
        height      = imgIn[0]->height;
        channels    = imgIn[0]->channels * 2;
        frames      = imgIn[0]->frames;
    }

    static Image *execute(Image *imgIn, Image *imgOut)
    {
        FilterBackwardDifference filter;
        return filter.Process(Single(imgIn), imgOut);
    }
};

} // end namespace pic

#endif /* PIC_FILTERING_FILTER_BACKWARD_DIFFERENCE_HPP */