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- //
- // Copyright 2005-2007 Adobe Systems Incorporated
- //
- // Distributed under 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_DYNAMIC_IMAGE_IMAGE_VIEW_FACTORY_HPP
- #define BOOST_GIL_EXTENSION_DYNAMIC_IMAGE_IMAGE_VIEW_FACTORY_HPP
- #include <boost/gil/extension/dynamic_image/any_image_view.hpp>
- #include <boost/gil/dynamic_step.hpp>
- #include <boost/gil/image_view_factory.hpp>
- #include <boost/gil/point.hpp>
- #include <boost/gil/detail/mp11.hpp>
- #include <cstdint>
- namespace boost { namespace gil {
- // Methods for constructing any image views from other any image views
- // Extends image view factory to runtime type-specified views (any_image_view)
- namespace detail {
- template <typename ResultView>
- struct flipped_up_down_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{flipped_up_down_view(src)};
- }
- };
- template <typename ResultView>
- struct flipped_left_right_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{flipped_left_right_view(src)};
- }
- };
- template <typename ResultView>
- struct rotated90cw_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{rotated90cw_view(src)};
- }
- };
- template <typename ResultView>
- struct rotated90ccw_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{rotated90ccw_view(src)};
- }
- };
- template <typename ResultView>
- struct tranposed_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{tranposed_view(src)};
- }
- };
- template <typename ResultView>
- struct rotated180_view_fn
- {
- using result_type = ResultView;
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{rotated180_view(src)};
- }
- };
- template <typename ResultView>
- struct subimage_view_fn
- {
- using result_type = ResultView;
- subimage_view_fn(point_t const& topleft, point_t const& dimensions)
- : _topleft(topleft), _size2(dimensions)
- {}
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{subimage_view(src,_topleft,_size2)};
- }
- point_t _topleft;
- point_t _size2;
- };
- template <typename ResultView>
- struct subsampled_view_fn
- {
- using result_type = ResultView;
- subsampled_view_fn(point_t const& step) : _step(step) {}
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{subsampled_view(src,_step)};
- }
- point_t _step;
- };
- template <typename ResultView>
- struct nth_channel_view_fn
- {
- using result_type = ResultView;
- nth_channel_view_fn(int n) : _n(n) {}
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type(nth_channel_view(src,_n));
- }
- int _n;
- };
- template <typename DstP, typename ResultView, typename CC = default_color_converter>
- struct color_converted_view_fn
- {
- using result_type = ResultView;
- color_converted_view_fn(CC cc = CC()): _cc(cc) {}
- template <typename View>
- auto operator()(View const& src) const -> result_type
- {
- return result_type{color_converted_view<DstP>(src, _cc)};
- }
- private:
- CC _cc;
- };
- } // namespace detail
- /// \ingroup ImageViewTransformationsFlipUD
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto flipped_up_down_view(any_image_view<Views> const& src)
- -> typename dynamic_y_step_type<any_image_view<Views>>::type
- {
- using result_view_t = typename dynamic_y_step_type<any_image_view<Views>>::type;
- return apply_operation(src, detail::flipped_up_down_view_fn<result_view_t>());
- }
- /// \ingroup ImageViewTransformationsFlipLR
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto flipped_left_right_view(any_image_view<Views> const& src)
- -> typename dynamic_x_step_type<any_image_view<Views>>::type
- {
- using result_view_t = typename dynamic_x_step_type<any_image_view<Views>>::type;
- return apply_operation(src, detail::flipped_left_right_view_fn<result_view_t>());
- }
- /// \ingroup ImageViewTransformationsTransposed
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto transposed_view(const any_image_view<Views>& src)
- -> typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type
- {
- using result_view_t = typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type;
- return apply_operation(src, detail::tranposed_view_fn<result_view_t>());
- }
- /// \ingroup ImageViewTransformations90CW
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto rotated90cw_view(const any_image_view<Views>& src)
- -> typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type
- {
- using result_view_t = typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type;
- return apply_operation(src,detail::rotated90cw_view_fn<result_view_t>());
- }
- /// \ingroup ImageViewTransformations90CCW
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto rotated90ccw_view(const any_image_view<Views>& src)
- -> typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type
- {
- return apply_operation(src,detail::rotated90ccw_view_fn<typename dynamic_xy_step_transposed_type<any_image_view<Views>>::type>());
- }
- /// \ingroup ImageViewTransformations180
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto rotated180_view(any_image_view<Views> const& src)
- -> typename dynamic_xy_step_type<any_image_view<Views>>::type
- {
- using step_type = typename dynamic_xy_step_type<any_image_view<Views>>::type;
- return apply_operation(src, detail::rotated180_view_fn<step_type>());
- }
- /// \ingroup ImageViewTransformationsSubimage
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto subimage_view(
- any_image_view<Views> const& src,
- point_t const& topleft,
- point_t const& dimensions)
- -> any_image_view<Views>
- {
- using subimage_view_fn = detail::subimage_view_fn<any_image_view<Views>>;
- return apply_operation(src, subimage_view_fn(topleft, dimensions));
- }
- /// \ingroup ImageViewTransformationsSubimage
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto subimage_view(
- any_image_view<Views> const& src,
- std::ptrdiff_t x_min, std::ptrdiff_t y_min, std::ptrdiff_t width, std::ptrdiff_t height)
- -> any_image_view<Views>
- {
- using subimage_view_fn = detail::subimage_view_fn<any_image_view<Views>>;
- return apply_operation(src, subimage_view_fn(point_t(x_min, y_min),point_t(width, height)));
- }
- /// \ingroup ImageViewTransformationsSubsampled
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto subsampled_view(any_image_view<Views> const& src, point_t const& step)
- -> typename dynamic_xy_step_type<any_image_view<Views>>::type
- {
- using step_type = typename dynamic_xy_step_type<any_image_view<Views>>::type;
- using subsampled_view = detail::subsampled_view_fn<step_type>;
- return apply_operation(src, subsampled_view(step));
- }
- /// \ingroup ImageViewTransformationsSubsampled
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto subsampled_view(any_image_view<Views> const& src, std::ptrdiff_t x_step, std::ptrdiff_t y_step)
- -> typename dynamic_xy_step_type<any_image_view<Views>>::type
- {
- using step_type = typename dynamic_xy_step_type<any_image_view<Views>>::type;
- using subsampled_view_fn = detail::subsampled_view_fn<step_type>;
- return apply_operation(src, subsampled_view_fn(point_t(x_step, y_step)));
- }
- namespace detail {
- template <typename View>
- struct get_nthchannel_type { using type = typename nth_channel_view_type<View>::type; };
- template <typename Views>
- struct views_get_nthchannel_type : mp11::mp_transform<get_nthchannel_type, Views> {};
- } // namespace detail
- /// \ingroup ImageViewTransformationsNthChannel
- /// \brief Given a runtime source image view, returns the type of a runtime image view over a single channel of the source view
- template <typename Views>
- struct nth_channel_view_type<any_image_view<Views>>
- {
- using type = any_image_view<typename detail::views_get_nthchannel_type<Views>::type>;
- };
- /// \ingroup ImageViewTransformationsNthChannel
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename Views>
- inline
- auto nth_channel_view(const any_image_view<Views>& src, int n)
- -> typename nth_channel_view_type<any_image_view<Views>>::type
- {
- using result_view_t = typename nth_channel_view_type<any_image_view<Views>>::type;
- return apply_operation(src,detail::nth_channel_view_fn<result_view_t>(n));
- }
- namespace detail {
- template <typename View, typename DstP, typename CC>
- struct get_ccv_type : color_converted_view_type<View, DstP, CC> {};
- template <typename Views, typename DstP, typename CC>
- struct views_get_ccv_type
- {
- private:
- // FIXME: Remove class name injection with detail:: qualification
- // Required as workaround for MP11 issue that treats unqualified metafunction
- // in the class definition of the same name as the specialization (Peter Dimov):
- // invalid template argument for template parameter 'F', expected a class template
- template <typename T>
- using ccvt = detail::get_ccv_type<T, DstP, CC>;
- public:
- using type = mp11::mp_transform<ccvt, Views>;
- };
- } // namespace detail
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief Returns the type of a runtime-specified view, color-converted to a given pixel type with user specified color converter
- template <typename Views, typename DstP, typename CC>
- struct color_converted_view_type<any_image_view<Views>,DstP,CC>
- {
- using type = any_image_view<typename detail::views_get_ccv_type<Views, DstP, CC>::type>;
- };
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief overload of generic color_converted_view with user defined color-converter
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename DstP, typename Views, typename CC>
- inline
- auto color_converted_view(const any_image_view<Views>& src, CC)
- -> typename color_converted_view_type<any_image_view<Views>, DstP, CC>::type
- {
- using cc_view_t = typename color_converted_view_type<any_image_view<Views>, DstP, CC>::type;
- return apply_operation(src, detail::color_converted_view_fn<DstP, cc_view_t>());
- }
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief Returns the type of a runtime-specified view, color-converted to a given pixel type with the default coor converter
- template <typename Views, typename DstP>
- struct color_converted_view_type<any_image_view<Views>,DstP>
- {
- using type = any_image_view<typename detail::views_get_ccv_type<Views, DstP, default_color_converter>::type>;
- };
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief overload of generic color_converted_view with the default color-converter
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename DstP, typename Views>
- inline
- auto color_converted_view(any_image_view<Views> const& src)
- -> typename color_converted_view_type<any_image_view<Views>, DstP>::type
- {
- using cc_view_t = typename color_converted_view_type<any_image_view<Views>, DstP>::type;
- return apply_operation(src, detail::color_converted_view_fn<DstP, cc_view_t>());
- }
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief overload of generic color_converted_view with user defined color-converter
- /// These are workarounds for GCC 3.4, which thinks color_converted_view is ambiguous with the same method for templated views (in gil/image_view_factory.hpp)
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename DstP, typename Views, typename CC>
- inline
- auto any_color_converted_view(const any_image_view<Views>& src, CC)
- -> typename color_converted_view_type<any_image_view<Views>, DstP, CC>::type
- {
- using cc_view_t = typename color_converted_view_type<any_image_view<Views>, DstP, CC>::type;
- return apply_operation(src, detail::color_converted_view_fn<DstP, cc_view_t>());
- }
- /// \ingroup ImageViewTransformationsColorConvert
- /// \brief overload of generic color_converted_view with the default color-converter
- /// These are workarounds for GCC 3.4, which thinks color_converted_view is ambiguous with the same method for templated views (in gil/image_view_factory.hpp)
- /// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
- template <typename DstP, typename Views>
- inline
- auto any_color_converted_view(const any_image_view<Views>& src)
- -> typename color_converted_view_type<any_image_view<Views>, DstP>::type
- {
- using cc_view_t = typename color_converted_view_type<any_image_view<Views>, DstP>::type;
- return apply_operation(src, detail::color_converted_view_fn<DstP, cc_view_t>());
- }
- /// \}
- }} // namespace boost::gil
- #endif
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