core/distance.hh

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/* -*- mia-c++  -*-
 *
 * This file is part of MIA - a toolbox for medical image analysis 
 * Copyright (c) Leipzig, Madrid 1999-2017 Gert Wollny
 *
 * MIA 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 3 of the License, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with MIA; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef mia_core_distance_hh
#define mia_core_distance_hh

#include <vector>
#include <algorithm>
#include <limits>
#include <iterator>

#include <mia/core/defines.hh>

NS_MIA_BEGIN

void EXPORT_CORE distance_transform_inplace(std::vector<float>& r); 

template <typename InputIterator, typename OutputIterator>
void  distance_transform_prepare(InputIterator in_begin, InputIterator in_end, 
                                 OutputIterator out_begin, bool to_mask) 
{
        if (to_mask) {
                std::transform(in_begin, in_end, out_begin, 
                               [](bool x){ return x ? 0.0f : std::numeric_limits<float>::max();});
        }else{
                std::transform(in_begin, in_end, out_begin, [](float x){ return x*x;});
        }
                
        
}

NS_MIA_END

#endif