boost/gil/extension/dynamic_image/image_view_factory.hpp
//
// 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 variant2::visit(detail::flipped_up_down_view_fn<result_view_t>(), src);
}
/// \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 variant2::visit(detail::flipped_left_right_view_fn<result_view_t>(), src);
}
/// \ingroup ImageViewTransformationsTransposed
/// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
template <typename ...Views>
inline
auto transposed_view(any_image_view<Views...> const& 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 variant2::visit(detail::tranposed_view_fn<result_view_t>(), src);
}
/// \ingroup ImageViewTransformations90CW
/// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
template <typename ...Views>
inline
auto rotated90cw_view(any_image_view<Views...> const& 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 variant2::visit(detail::rotated90cw_view_fn<result_view_t>(), src);
}
/// \ingroup ImageViewTransformations90CCW
/// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
template <typename ...Views>
inline
auto rotated90ccw_view(any_image_view<Views...> const& 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 variant2::visit(detail::rotated90ccw_view_fn<result_view_t>(), src);
}
/// \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 result_view_t = typename dynamic_xy_step_type<any_image_view<Views...>>::type;
return variant2::visit(detail::rotated180_view_fn<result_view_t>(), src);
}
/// \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 variant2::visit(subimage_view_fn(topleft, dimensions), src);
}
/// \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 variant2::visit(subimage_view_fn(point_t(x_min, y_min),point_t(width, height)), src);
}
/// \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 variant2::visit(subsampled_view(step), src);
}
/// \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 variant2::visit(subsampled_view_fn(point_t(x_step, y_step)), src);
}
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 = typename detail::views_get_nthchannel_type<any_image_view<Views...>>;
};
/// \ingroup ImageViewTransformationsNthChannel
/// \tparam Views Models Boost.MP11-compatible list of models of ImageViewConcept
template <typename ...Views>
inline
auto nth_channel_view(any_image_view<Views...> const& 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 variant2::visit(detail::nth_channel_view_fn<result_view_t>(n), src);
}
namespace detail {
template <typename Views, typename DstP, typename CC>
struct views_get_ccv_type
{
private:
template <typename T>
using ccvt = typename color_converted_view_type<T, DstP, CC>::type;
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>;
using type = typename detail::views_get_ccv_type<any_image_view<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(any_image_view<Views...> const& src, CC 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 variant2::visit(detail::color_converted_view_fn<DstP, cc_view_t, CC>(cc), src);
}
/// \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 = typename detail::views_get_ccv_type<any_image_view<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 variant2::visit(detail::color_converted_view_fn<DstP, cc_view_t>(), src);
}
/// \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>
[[deprecated("Use color_converted_view(const any_image_view<Views...>& src, CC) instead.")]]
inline
auto any_color_converted_view(const any_image_view<Views...>& src, CC cc)
-> typename color_converted_view_type<any_image_view<Views...>, DstP, CC>::type
{
return color_converted_view(src, cc);
}
/// \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>
[[deprecated("Use color_converted_view(any_image_view<Views...> const& src) instead.")]]
inline
auto any_color_converted_view(const any_image_view<Views...>& src)
-> typename color_converted_view_type<any_image_view<Views...>, DstP>::type
{
return color_converted_view(src);
}
/// \}
}} // namespace boost::gil
#endif