channel.hpp

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#ifndef _TERRY_CHANNEL_HPP_
#define _TERRY_CHANNEL_HPP_

#include <boost/gil/channel.hpp>
#include <boost/gil/color_base_algorithm.hpp>

namespace terry {

template <typename ChannelValue>
struct channel_base_type
{
        typedef ChannelValue type;
};

template <typename ChannelValue, typename MinV, typename MaxV>
struct channel_base_type<boost::gil::scoped_channel_value<ChannelValue, MinV, MaxV> >
{
        typedef ChannelValue type;
};

template <typename ChannelValue>
struct is_scoped_channel
{
        typedef boost::mpl::false_ type;
};

template <typename ChannelValue, typename MinV, typename MaxV>
struct is_scoped_channel<boost::gil::scoped_channel_value<ChannelValue, MinV, MaxV> >
{
        typedef boost::mpl::true_ type;
};



template< class Pixel, class Channel, class HasChannel = typename boost::gil::contains_color<Pixel,Channel>::type >
struct assign_channel_if_exists_t
{
        void operator()( const Pixel& src, const Pixel& dst ) const;
};

// no alpha, nothing to do...
template<class Pixel, class Channel>
struct assign_channel_if_exists_t<Pixel, Channel, boost::mpl::false_>
{
        void operator()( const Pixel& src, Pixel& dst ) const
        {
        }
};

template<class Pixel, class Channel>
struct assign_channel_if_exists_t<Pixel, Channel, boost::mpl::true_>
{
        void operator()( const Pixel& src, Pixel& dst ) const
        {
                using namespace boost::gil;
                get_color( dst, Channel() ) = get_color( src, Channel() );
        }
};


}

#endif