GrayValue.hpp

// This file is part of the imaging2 class library.
//
// University of Innsbruck, Infmath Imaging, 2009.
// http://infmath.uibk.ac.at
//
// All rights reserved.


#ifndef IMAGE_GRAYVALUE_H
#define IMAGE_GRAYVALUE_H

#include <core/imaging2.hpp>
#include <image/Image.hpp>

namespace imaging
{
  class Color;
  
  class GrayValue
  {
    unsigned char _value;
    
  public:
    GrayValue() {}
  
    GrayValue(const GrayValue & value) : _value(value._value) {}
    
    explicit GrayValue(const Color & c_value);

    explicit GrayValue(unsigned char value) : _value(value) {}

    explicit GrayValue(float_t value) : _value((unsigned char)(value * 255.0)) {}

    GrayValue & operator=(GrayValue gray_value) { _value = gray_value._value; return *this; }

    GrayValue & operator=(unsigned char value) { *this = GrayValue(value); return *this; }

    GrayValue & operator=(float_t value) { *this = GrayValue(value); return *this; }
    
    operator unsigned char() const { return (unsigned char)(_value); }
    
    operator float_t() const { return float_t(_value) / 255.0; }
  };
  
  typedef Image<2, GrayValue> GrayImage2d;
  
  template<>
  void GrayImage2d::read_image(const std::string & file_name);
  
  template<>
  void GrayImage2d::write_image(const std::string & file_name) const;
  
  typedef Image<3, GrayValue> GrayImage3d;
  
  template<>
  void GrayImage3d::read_image(const std::string & file_name);
  
  template<>
  void GrayImage3d::write_image(const std::string & file_name) const;
}

#endif

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