clamp.hpp

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#ifndef _TERRY_NUMERIC_CLAMP_HPP_
#define _TERRY_NUMERIC_CLAMP_HPP_


namespace terry {
namespace numeric {

template <typename Channel>
struct channel_clamp_lower_than_t : public std::unary_function<Channel, Channel>
{
        Channel _threshold;
        Channel _replace;

        channel_clamp_lower_than_t( const Channel threshold, const Channel replace )
        : _threshold( threshold )
        , _replace( replace )
        { }

        GIL_FORCEINLINE
        Channel operator( )( typename channel_traits<Channel>::const_reference ch ) const
        {
                if( ch < _threshold )
                        return _replace;
                return Channel( ch );
        }
};

template <typename Pixel> // models pixel concept
struct pixel_clamp_lower_than_t
{
        typedef typename channel_type<Pixel>::type Channel;
        Channel _threshold;
        Channel _replace;

        pixel_clamp_lower_than_t( const Channel threshold, const Channel replace )
        : _threshold( threshold )
        , _replace( replace )
        {}

        GIL_FORCEINLINE
        Pixel operator()( const Pixel & p ) const
        {
                Pixel result;
                static_transform( p, result, channel_clamp_lower_than_t<typename channel_type<Pixel>::type>( _threshold, _replace ) );
                return result;
        }
};


}
}

#endif