// -------------------------------------------------------------------------
// @author Leonardo Florez-Valencia (florez-l@javeriana.edu.co)
// -------------------------------------------------------------------------

#ifndef __CPEXTENSIONS__ALGORITHMS__RGBEXTRACTFUNCTION__H__
#define __CPEXTENSIONS__ALGORITHMS__RGBEXTRACTFUNCTION__H__

#include <cmath>
#include <limits>
#include <vnl/vnl_math.h>

#include <itkRGBPixel.h>

namespace cpExtensions
{
  namespace Algorithms
  {
    /**
     */
    template< class P >
    struct RGBExtractFunction
    {
      typedef RGBExtractFunction    Self;
      typedef P                     TOutPixel;
      typedef typename P::ValueType TValue;

      template< class Tr, class Tg, class Tb >
      P operator()( const Tr& r, const Tg& g, const Tb& b ) const
        {
          P out;
          out[ 0 ] = TValue( r );
          out[ 1 ] = TValue( g );
          out[ 2 ] = TValue( b );
          return( out );
        }

      template< class C >
      TOutPixel operator()( const itk::RGBPixel< C >& rgb ) const
        {
          return(
            this->operator()(
              rgb.GetRed( ), rgb.GetGreen( ), rgb.GetBlue( )
              )
            );
        }
    };

  } // ecapseman

} // ecapseman

#endif // __CPEXTENSIONS__ALGORITHMS__RGBEXTRACTFUNCTION__H__

// eof - $RCSfile$