invert.hpp

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#ifndef _TERRY_COLOR_INVERT_HPP_
#define _TERRY_COLOR_INVERT_HPP_

#include <terry/channel.hpp>

namespace terry {
namespace color {

template< typename Channel>
struct channel_invert_t
{
        void operator()( const Channel& src, Channel& dst ) const
        {
                dst = boost::gil::channel_invert( src );
        }
};

/**
 * @brief Invert colored channel values. So invert all channel values except alpha channel.
 */
struct pixel_invert_colors_t
{
        template<class Pixel>
        Pixel operator()( const Pixel& src ) const
        {
                typedef typename boost::gil::channel_type<Pixel>::type Channel;
                Pixel res;
                boost::gil::static_for_each( src, res, channel_invert_t<Channel>() );
                terry::assign_channel_if_exists_t< Pixel, boost::gil::alpha_t >()( src, res );
                return res;
        }
};

/**
 * @brief Invert channel values
 */
struct pixel_invert_t
{
        template<class Pixel>
        Pixel operator()( const Pixel& src ) const
        {
                typedef typename boost::gil::channel_type<Pixel>::type Channel;
                Pixel res;
                boost::gil::static_for_each( src, res, channel_invert_t<Channel>() );
                return res;
        }
};


}
}

#endif