bilinear.hpp

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#ifndef _TERRY_SAMPLER_BILINEAR_HPP_
#define _TERRY_SAMPLER_BILINEAR_HPP_

#include "details.hpp"

namespace terry {
using namespace boost::gil;
namespace sampler {

struct bilinear_sampler
{
        const size_t _windowSize;

        bilinear_sampler() :
                _windowSize ( 2.0 )
        {}

        /**
         * @brief Get weight for a specific distance, for all bilinear resampler.
         *
         * @param[in] distance between the pixels and the current pixel
         * @param[out] weight return value to weight the pixel in filtering
         */
        template<typename Weight>
        void operator()( const RESAMPLING_CORE_TYPE& distance, Weight& weight )
        {
                RESAMPLING_CORE_TYPE absDistance = std::abs( (RESAMPLING_CORE_TYPE) distance );
                if( absDistance < 1 )
                {
                        weight = ( 1.0 - absDistance );
                }
                else
                {
                        weight = 0;
                }
        }
};

}
}

#endif