rgb_operators.h

//
// Copyright (c) 2013 Danny Havenith
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
/**
 * Operators for RGB values.
 * Specifically, this file contains functions for "clipped addition" where the values of two bytes that are added
 * will never overflow, but will instead be clipped at the maximum value of 255.
 */

#ifndef RGB_OPERATORS_HPP_
#define RGB_OPERATORS_HPP_

#include "rgb.h"

namespace ws2811
{
  namespace detail {
    inline uint8_t add_clipped( uint16_t left, uint16_t right)
    {
      uint16_t result = left + right;
      if (result > 255) result = 255;
      return result;
    }
  }

  inline void add_clipped( rgb &left, const rgb &right)
  {
    using detail::add_clipped;
    left = rgb(
        add_clipped(left.red, right.red),
        add_clipped( left.green, right.green),
        add_clipped( left.blue, right.blue)
        );
  }

}






#endif /* RGB_OPERATORS_HPP_ */