BasicColorToScalarFunctors.h

#pragma once

#if defined(ColorToScalarFunctors_RECURSES)
#error Recursive header files inclusion detected in ColorToScalarFunctors.h
#else // defined(ColorToScalarFunctors_RECURSES)

#define ColorToScalarFunctors_RECURSES

#if !defined ColorToScalarFunctors_h

#define ColorToScalarFunctors_h

// Inclusions
#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/io/Color.h"

namespace DGtal
{
  namespace functors
  {
    struct RedChannel 
    {
      inline
      unsigned char operator() (const Color &aCol) const
      {
        return aCol.red(); 
      }
    };

    struct BlueChannel 
    {
      inline
      unsigned char operator() (const Color &aCol) const
      {
        return aCol.blue(); 
      }
    };

    struct GreenChannel 
    {
      inline
      unsigned char operator() (const Color &aCol) const
      {
        return aCol.green(); 
      }
    };

    struct MeanChannels 
    {
      inline
      unsigned char operator() (const Color &aCol) const
      {
        return static_cast<unsigned char>(  ((int)aCol.green() + (int)aCol.blue() + (int)aCol.red()) / 3); 
      }
    };

    template<typename TValue>
    struct ColorRGBEncoder
    {
      typedef TValue Value;
      
      inline
      Value operator() (const Color &aCol) const
      {
        return static_cast<Value> (aCol.getRGB()); 
      }
    };
    
  } //namespace functors
} // namespace DGtal

  //                                                                           //

#endif // !defined ColorToScalarFunctors_h

#undef ColorToScalarFunctors_RECURSES
#endif // else defined(ColorToScalarFunctors_RECURSES)