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)