59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
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//
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// Copyright 2010 Fabien Castan, Christian Henning
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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_TOOLBOX_CHANNEL_VIEW_HPP
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#define BOOST_GIL_EXTENSION_TOOLBOX_CHANNEL_VIEW_HPP
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#include <boost/gil/image_view_factory.hpp>
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namespace boost {
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namespace gil {
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template <typename Channel, typename View>
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struct channel_type_to_index
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{
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static constexpr int value = detail::type_to_index
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<
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typename color_space_type<View>::type, // color (Boost.MP11-compatible list)
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Channel // channel type
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>::value; // index of the channel in the color (Boost.MP11-compatible list)
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};
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template<typename Channel, typename View>
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struct channel_view_type : kth_channel_view_type
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<
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channel_type_to_index<Channel, View>::value,
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View
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>
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{
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static constexpr int index = channel_type_to_index
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<
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Channel,
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View
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>::value;
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using parent_t = kth_channel_view_type<index, View>;
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using type = typename parent_t::type;
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static type make( const View& src )
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{
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return parent_t::make( src );
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}
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};
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/// \ingroup ImageViewTransformationsKthChannel
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template<typename Channel, typename View>
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auto channel_view(View const& src)
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-> typename channel_view_type<Channel, View>::type
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{
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return channel_view_type<Channel, View>::make(src);
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}
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}} // namespace boost::gil
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#endif
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