148 lines
5.7 KiB
C++
148 lines
5.7 KiB
C++
//
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// Copyright 2005-2007 Adobe Systems Incorporated
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_EXTENSION_NUMERIC_CHANNEL_NUMERIC_OPERATIONS_HPP
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#define BOOST_GIL_EXTENSION_NUMERIC_CHANNEL_NUMERIC_OPERATIONS_HPP
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#include <boost/gil/channel.hpp>
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namespace boost { namespace gil {
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// Structures for channel-wise numeric operations
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// Currently defined structures:
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// channel_plus_t (+), channel_minus_t (-),
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// channel_multiplies_t (*), channel_divides_t (/),
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// channel_plus_scalar_t (+s), channel_minus_scalar_t (-s),
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// channel_multiplies_scalar_t (*s), channel_divides_scalar_t (/s),
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// channel_halves_t (/=2), channel_zeros_t (=0), channel_assigns_t (=)
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/// \ingroup ChannelNumericOperations
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/// structure for adding one channel to another
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel1,typename Channel2,typename ChannelR>
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struct channel_plus_t {
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ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
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typename channel_traits<Channel2>::const_reference ch2) const {
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return ChannelR(ch1)+ChannelR(ch2);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for subtracting one channel from another
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel1,typename Channel2,typename ChannelR>
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struct channel_minus_t {
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ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
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typename channel_traits<Channel2>::const_reference ch2) const {
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return ChannelR(ch1)-ChannelR(ch2);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for multiplying one channel to another
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel1,typename Channel2,typename ChannelR>
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struct channel_multiplies_t {
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ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
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typename channel_traits<Channel2>::const_reference ch2) const {
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return ChannelR(ch1)*ChannelR(ch2);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for dividing channels
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel1,typename Channel2,typename ChannelR>
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struct channel_divides_t {
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ChannelR operator()(typename channel_traits<Channel1>::const_reference ch1,
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typename channel_traits<Channel2>::const_reference ch2) const {
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return ChannelR(ch1)/ChannelR(ch2);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for adding a scalar to a channel
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel,typename Scalar,typename ChannelR>
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struct channel_plus_scalar_t {
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ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
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const Scalar& s) const {
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return ChannelR(ch)+ChannelR(s);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for subtracting a scalar from a channel
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel,typename Scalar,typename ChannelR>
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struct channel_minus_scalar_t {
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ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
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const Scalar& s) const {
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return ChannelR(ch-s);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for multiplying a scalar to one channel
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel,typename Scalar,typename ChannelR>
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struct channel_multiplies_scalar_t {
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ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
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const Scalar& s) const {
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return ChannelR(ch)*ChannelR(s);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for dividing a channel by a scalar
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel,typename Scalar,typename ChannelR>
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struct channel_divides_scalar_t {
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ChannelR operator()(typename channel_traits<Channel>::const_reference ch,
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const Scalar& s) const {
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return ChannelR(ch)/ChannelR(s);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for halving a channel
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel>
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struct channel_halves_t {
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typename channel_traits<Channel>::reference
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operator()(typename channel_traits<Channel>::reference ch) const {
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return ch/=2.0;
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for setting a channel to zero
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel>
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struct channel_zeros_t {
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typename channel_traits<Channel>::reference
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operator()(typename channel_traits<Channel>::reference ch) const {
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return ch=Channel(0);
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}
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};
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/// \ingroup ChannelNumericOperations
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/// structure for assigning one channel to another
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/// this is a generic implementation; user should specialize it for better performance
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template <typename Channel1,typename Channel2>
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struct channel_assigns_t {
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typename channel_traits<Channel2>::reference
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operator()(typename channel_traits<Channel1>::const_reference ch1,
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typename channel_traits<Channel2>::reference ch2) const {
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return ch2=Channel2(ch1);
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}
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};
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}} // namespace boost::gil
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#endif
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