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/*
Copyright 2005-2007 Adobe Systems Incorporated
Use, modification and distribution are subject to 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).
*/
/*************************************************************************************************/
#ifndef BOOST_GIL_EXTENSION_NUMERIC_CHANNEL_NUMERIC_OPERATIONS_HPP
#define BOOST_GIL_EXTENSION_NUMERIC_CHANNEL_NUMERIC_OPERATIONS_HPP
/*!
/// \file
/// \brief Structures for channel-wise numeric operations
/// \author Hailin Jin and Lubomir Bourdev \n
/// Adobe Systems Incorporated
/// \date 2005-2007 \n
/// Currently defined structures:
/// channel_plus_t (+), channel_minus_t (-),
/// channel_multiplies_t (*), channel_divides_t (/),
/// channel_plus_scalar_t (+s), channel_minus_scalar_t (-s),
/// channel_multiplies_scalar_t (*s), channel_divides_scalar_t (/s),
/// channel_halves_t (/=2), channel_zeros_t (=0), channel_assigns_t (=)
*/
#include <functional>
#include <boost/gil/gil_config.hpp>
#include <boost/gil/channel.hpp>
namespace boost { namespace gil {
/// \ingroup ChannelNumericOperations
/// structure for adding one channel to another
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel1,typename Channel2,typename ChannelR>
struct channel_plus_t : public std::binary_function<Channel1,Channel2,ChannelR> {
ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
typename channel_traits<Channel2>::const_reference ch2) const {
return ChannelR(ch1)+ChannelR(ch2);
}
};
/// \ingroup ChannelNumericOperations
/// structure for subtracting one channel from another
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel1,typename Channel2,typename ChannelR>
struct channel_minus_t : public std::binary_function<Channel1,Channel2,ChannelR> {
ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
typename channel_traits<Channel2>::const_reference ch2) const {
return ChannelR(ch1)-ChannelR(ch2);
}
};
/// \ingroup ChannelNumericOperations
/// structure for multiplying one channel to another
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel1,typename Channel2,typename ChannelR>
struct channel_multiplies_t : public std::binary_function<Channel1,Channel2,ChannelR> {
ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
typename channel_traits<Channel2>::const_reference ch2) const {
return ChannelR(ch1)*ChannelR(ch2);
}
};
/// \ingroup ChannelNumericOperations
/// structure for dividing channels
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel1,typename Channel2,typename ChannelR>
struct channel_divides_t : public std::binary_function<Channel1,Channel2,ChannelR> {
ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
typename channel_traits<Channel2>::const_reference ch2) const {
return ChannelR(ch1)/ChannelR(ch2);
}
};
/// \ingroup ChannelNumericOperations
/// structure for adding a scalar to a channel
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel,typename Scalar,typename ChannelR>
struct channel_plus_scalar_t : public std::binary_function<Channel,Scalar,ChannelR> {
ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
const Scalar& s) const {
return ChannelR(ch)+ChannelR(s);
}
};
/// \ingroup ChannelNumericOperations
/// structure for subtracting a scalar from a channel
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel,typename Scalar,typename ChannelR>
struct channel_minus_scalar_t : public std::binary_function<Channel,Scalar,ChannelR> {
ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
const Scalar& s) const {
return ChannelR(ch-s);
}
};
/// \ingroup ChannelNumericOperations
/// structure for multiplying a scalar to one channel
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel,typename Scalar,typename ChannelR>
struct channel_multiplies_scalar_t : public std::binary_function<Channel,Scalar,ChannelR> {
ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
const Scalar& s) const {
return ChannelR(ch)*ChannelR(s);
}
};
/// \ingroup ChannelNumericOperations
/// structure for dividing a channel by a scalar
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel,typename Scalar,typename ChannelR>
struct channel_divides_scalar_t : public std::binary_function<Channel,Scalar,ChannelR> {
ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
const Scalar& s) const {
return ChannelR(ch)/ChannelR(s);
}
};
/// \ingroup ChannelNumericOperations
/// structure for halving a channel
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel>
struct channel_halves_t : public std::unary_function<Channel,Channel> {
typename channel_traits<Channel>::reference
operator()(typename channel_traits<Channel>::reference ch) const {
return ch/=2.0;
}
};
/// \ingroup ChannelNumericOperations
/// structure for setting a channel to zero
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel>
struct channel_zeros_t : public std::unary_function<Channel,Channel> {
typename channel_traits<Channel>::reference
operator()(typename channel_traits<Channel>::reference ch) const {
return ch=Channel(0);
}
};
/// \ingroup ChannelNumericOperations
/// structure for assigning one channel to another
/// this is a generic implementation; user should specialize it for better performance
template <typename Channel1,typename Channel2>
struct channel_assigns_t : public std::binary_function<Channel1,Channel2,Channel2> {
typename channel_traits<Channel2>::reference
operator()(typename channel_traits<Channel1>::const_reference ch1,
typename channel_traits<Channel2>::reference ch2) const {
return ch2=Channel2(ch1);
}
};
} } // namespace boost::gil
#endif // BOOST_GIL_EXTENSION_NUMERIC_CHANNEL_NUMERIC_OPERATIONS_HPP
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