//
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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_IMAGE_VIEW_FACTORY_HPP
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#define BOOST_GIL_IMAGE_VIEW_FACTORY_HPP
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#include <boost/gil/color_convert.hpp>
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#include <boost/gil/dynamic_step.hpp>
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#include <boost/gil/gray.hpp>
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#include <boost/gil/image_view.hpp>
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#include <boost/gil/metafunctions.hpp>
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#include <boost/gil/point.hpp>
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#include <boost/gil/detail/mp11.hpp>
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#include <boost/assert.hpp>
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#include <cstddef>
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#include <type_traits>
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/// Methods for creating shallow image views from raw pixel data or from other image views -
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/// flipping horizontally or vertically, axis-aligned rotation, a subimage, subsampled
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/// or n-th channel image view. Derived image views are shallow copies and are fast to construct.
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/// \defgroup ImageViewConstructors Image View From Raw Data
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/// \ingroup ImageViewAlgorithm
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/// \brief Methods for constructing image views from raw data and for getting raw data from views
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/// \defgroup ImageViewTransformations Image View Transformations
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/// \ingroup ImageViewAlgorithm
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/// \brief Methods for constructing one image view from another
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namespace boost { namespace gil {
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struct default_color_converter;
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template <typename T> struct transposed_type;
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/// \brief Returns the type of a view that has a dynamic step along both X and Y
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/// \ingroup ImageViewTransformations
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template <typename View>
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struct dynamic_xy_step_type
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: dynamic_y_step_type<typename dynamic_x_step_type<View>::type> {};
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/// \brief Returns the type of a transposed view that has a dynamic step along both X and Y
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/// \ingroup ImageViewTransformations
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template <typename View>
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struct dynamic_xy_step_transposed_type
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: dynamic_xy_step_type<typename transposed_type<View>::type> {};
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/// \ingroup ImageViewConstructors
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/// \brief Constructing image views from raw interleaved pixel data
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template <typename Iterator>
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typename type_from_x_iterator<Iterator>::view_t
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interleaved_view(std::size_t width, std::size_t height,
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Iterator pixels, std::ptrdiff_t rowsize_in_bytes) {
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using RView = typename type_from_x_iterator<Iterator>::view_t;
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return RView(width, height, typename RView::locator(pixels, rowsize_in_bytes));
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}
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/// \ingroup ImageViewConstructors
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/// \brief Constructing image views from raw interleaved pixel data
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template <typename Iterator>
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auto interleaved_view(point<std::ptrdiff_t> dim, Iterator pixels,
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std::ptrdiff_t rowsize_in_bytes)
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-> typename type_from_x_iterator<Iterator>::view_t
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{
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using RView = typename type_from_x_iterator<Iterator>::view_t;
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return RView(dim, typename RView::locator(pixels, rowsize_in_bytes));
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}
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/////////////////////////////
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// interleaved_view_get_raw_data, planar_view_get_raw_data - return pointers to the raw data (the channels) of a basic homogeneous view.
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/////////////////////////////
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namespace detail {
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template <typename View, bool IsMutable> struct channel_pointer_type_impl;
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template <typename View> struct channel_pointer_type_impl<View, true> {
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using type = typename channel_type<View>::type *;
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};
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template <typename View> struct channel_pointer_type_impl<View, false> {
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using type = const typename channel_type<View>::type *;
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};
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template <typename View> struct channel_pointer_type
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: public channel_pointer_type_impl<View, view_is_mutable<View>::value> {};
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} // namespace detail
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/// \ingroup ImageViewConstructors
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/// \brief Returns C pointer to the the channels of an interleaved homogeneous view.
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template <typename HomogeneousView>
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typename detail::channel_pointer_type<HomogeneousView>::type interleaved_view_get_raw_data(const HomogeneousView& view) {
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static_assert(!is_planar<HomogeneousView>::value && view_is_basic<HomogeneousView>::value, "");
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static_assert(std::is_pointer<typename HomogeneousView::x_iterator>::value, "");
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return &gil::at_c<0>(view(0,0));
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}
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/// \ingroup ImageViewConstructors
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/// \brief Returns C pointer to the the channels of a given color plane of a planar homogeneous view.
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template <typename HomogeneousView>
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typename detail::channel_pointer_type<HomogeneousView>::type planar_view_get_raw_data(const HomogeneousView& view, int plane_index) {
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static_assert(is_planar<HomogeneousView>::value && view_is_basic<HomogeneousView>::value, "");
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return dynamic_at_c(view.row_begin(0),plane_index);
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}
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/// \defgroup ImageViewTransformationsColorConvert color_converted_view
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/// \ingroup ImageViewTransformations
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/// \brief Color converted view of another view
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/// \ingroup ImageViewTransformationsColorConvert PixelDereferenceAdaptorModel
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/// \brief Function object that given a source pixel, returns it converted to a given color space and channel depth. Models: PixelDereferenceAdaptorConcept
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///
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/// Useful in constructing a color converted view over a given image view
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template <typename SrcConstRefP, typename DstP, typename CC=default_color_converter > // const_reference to the source pixel and destination pixel value
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class color_convert_deref_fn : public deref_base<color_convert_deref_fn<SrcConstRefP,DstP,CC>, DstP, DstP, const DstP&, SrcConstRefP, DstP, false> {
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private:
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CC _cc; // color-converter
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public:
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color_convert_deref_fn() {}
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color_convert_deref_fn(CC cc_in) : _cc(cc_in) {}
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DstP operator()(SrcConstRefP srcP) const {
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DstP dstP;
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_cc(srcP,dstP);
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return dstP;
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}
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};
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namespace detail {
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// Add color converter upon dereferencing
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template <typename SrcView, typename CC, typename DstP, typename SrcP>
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struct _color_converted_view_type {
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private:
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using deref_t = color_convert_deref_fn<typename SrcView::const_t::reference,DstP,CC>;
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using add_ref_t = typename SrcView::template add_deref<deref_t>;
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public:
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using type = typename add_ref_t::type;
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static type make(const SrcView& sv,CC cc) {return add_ref_t::make(sv,deref_t(cc));}
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};
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// If the Src view has the same pixel type as the target, there is no need for color conversion
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template <typename SrcView, typename CC, typename DstP>
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struct _color_converted_view_type<SrcView,CC,DstP,DstP> {
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using type = SrcView;
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static type make(const SrcView& sv,CC) {return sv;}
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};
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} // namespace detail
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/// \brief Returns the type of a view that does color conversion upon dereferencing its pixels
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/// \ingroup ImageViewTransformationsColorConvert
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template <typename SrcView, typename DstP, typename CC=default_color_converter>
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struct color_converted_view_type : public detail::_color_converted_view_type<SrcView,
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CC,
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DstP,
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typename SrcView::value_type> {
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BOOST_GIL_CLASS_REQUIRE(DstP, boost::gil, MutablePixelConcept)//why does it have to be mutable???
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};
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/// \ingroup ImageViewTransformationsColorConvert
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/// \brief view of a different color space with a user defined color-converter
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template <typename DstP, typename View, typename CC>
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inline typename color_converted_view_type<View,DstP,CC>::type color_converted_view(const View& src,CC cc) {
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return color_converted_view_type<View,DstP,CC>::make(src,cc);
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}
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/// \ingroup ImageViewTransformationsColorConvert
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/// \brief overload of generic color_converted_view with the default color-converter
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template <typename DstP, typename View>
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inline typename color_converted_view_type<View,DstP>::type
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color_converted_view(const View& src) {
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return color_converted_view<DstP>(src,default_color_converter());
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}
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/// \defgroup ImageViewTransformationsFlipUD flipped_up_down_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view flipped up-to-down
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/// \ingroup ImageViewTransformationsFlipUD
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template <typename View>
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inline typename dynamic_y_step_type<View>::type flipped_up_down_view(const View& src) {
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using RView = typename dynamic_y_step_type<View>::type;
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return RView(src.dimensions(),typename RView::xy_locator(src.xy_at(0,src.height()-1),-1));
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}
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/// \defgroup ImageViewTransformationsFlipLR flipped_left_right_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view flipped left-to-right
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/// \ingroup ImageViewTransformationsFlipLR
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template <typename View>
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inline typename dynamic_x_step_type<View>::type flipped_left_right_view(const View& src) {
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using RView = typename dynamic_x_step_type<View>::type;
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return RView(src.dimensions(),typename RView::xy_locator(src.xy_at(src.width()-1,0),-1,1));
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}
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/// \defgroup ImageViewTransformationsTransposed transposed_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view transposed
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/// \ingroup ImageViewTransformationsTransposed
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template <typename View>
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inline typename dynamic_xy_step_transposed_type<View>::type transposed_view(const View& src) {
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using RView = typename dynamic_xy_step_transposed_type<View>::type;
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return RView(src.height(),src.width(),typename RView::xy_locator(src.xy_at(0,0),1,1,true));
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}
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/// \defgroup ImageViewTransformations90CW rotated90cw_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view rotated 90 degrees clockwise
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/// \ingroup ImageViewTransformations90CW
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template <typename View>
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inline typename dynamic_xy_step_transposed_type<View>::type rotated90cw_view(const View& src) {
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using RView = typename dynamic_xy_step_transposed_type<View>::type;
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return RView(src.height(),src.width(),typename RView::xy_locator(src.xy_at(0,src.height()-1),-1,1,true));
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}
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/// \defgroup ImageViewTransformations90CCW rotated90ccw_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view rotated 90 degrees counter-clockwise
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/// \ingroup ImageViewTransformations90CCW
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template <typename View>
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inline typename dynamic_xy_step_transposed_type<View>::type rotated90ccw_view(const View& src) {
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using RView = typename dynamic_xy_step_transposed_type<View>::type;
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return RView(src.height(),src.width(),typename RView::xy_locator(src.xy_at(src.width()-1,0),1,-1,true));
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}
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/// \defgroup ImageViewTransformations180 rotated180_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a view rotated 180 degrees
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/// \ingroup ImageViewTransformations180
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template <typename View>
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inline typename dynamic_xy_step_type<View>::type rotated180_view(const View& src) {
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using RView = typename dynamic_xy_step_type<View>::type;
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return RView(src.dimensions(),typename RView::xy_locator(src.xy_at(src.width()-1,src.height()-1),-1,-1));
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}
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/// \defgroup ImageViewTransformationsSubimage subimage_view
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/// \ingroup ImageViewTransformations
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/// \brief view of an axis-aligned rectangular area within an image_view
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/// \ingroup ImageViewTransformationsSubimage
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template <typename View>
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inline View subimage_view(
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View const& src,
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typename View::point_t const& topleft,
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typename View::point_t const& dimensions)
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{
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return View(dimensions, src.xy_at(topleft));
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}
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/// \ingroup ImageViewTransformationsSubimage
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template <typename View>
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inline View subimage_view(View const& src,
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typename View::coord_t x_min,
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typename View::coord_t y_min,
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typename View::coord_t width,
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typename View::coord_t height)
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{
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return View(width, height, src.xy_at(x_min, y_min));
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}
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/// \defgroup ImageViewTransformationsSubsampled subsampled_view
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/// \ingroup ImageViewTransformations
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/// \brief view of a subsampled version of an image_view, stepping over a number of channels in X and number of rows in Y
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/// \ingroup ImageViewTransformationsSubsampled
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template <typename View>
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inline
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auto subsampled_view(View const& src, typename View::coord_t x_step, typename View::coord_t y_step)
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-> typename dynamic_xy_step_type<View>::type
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{
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BOOST_ASSERT(x_step > 0 && y_step > 0);
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using view_t =typename dynamic_xy_step_type<View>::type;
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return view_t(
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(src.width() + (x_step - 1)) / x_step,
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(src.height() + (y_step - 1)) / y_step,
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typename view_t::xy_locator(src.xy_at(0,0), x_step, y_step));
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}
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/// \ingroup ImageViewTransformationsSubsampled
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template <typename View>
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inline auto subsampled_view(View const& src, typename View::point_t const& step)
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-> typename dynamic_xy_step_type<View>::type
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{
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return subsampled_view(src, step.x, step.y);
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}
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/// \defgroup ImageViewTransformationsNthChannel nth_channel_view
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/// \ingroup ImageViewTransformations
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/// \brief single-channel (grayscale) view of the N-th channel of a given image_view
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namespace detail {
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template <typename View, bool AreChannelsTogether> struct __nth_channel_view_basic;
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// nth_channel_view when the channels are not adjacent in memory. This can happen for multi-channel interleaved images
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// or images with a step
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template <typename View>
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struct __nth_channel_view_basic<View,false> {
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using type = typename view_type<typename channel_type<View>::type, gray_layout_t, false, true, view_is_mutable<View>::value>::type;
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static type make(const View& src, int n) {
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using locator_t = typename type::xy_locator;
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using x_iterator_t = typename type::x_iterator;
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using x_iterator_base_t = typename iterator_adaptor_get_base<x_iterator_t>::type;
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x_iterator_t sit(x_iterator_base_t(&(src(0,0)[n])),src.pixels().pixel_size());
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return type(src.dimensions(),locator_t(sit, src.pixels().row_size()));
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}
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};
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// nth_channel_view when the channels are together in memory (true for simple grayscale or planar images)
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template <typename View>
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struct __nth_channel_view_basic<View,true> {
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using type = typename view_type<typename channel_type<View>::type, gray_layout_t, false, false, view_is_mutable<View>::value>::type;
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static type make(const View& src, int n) {
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using x_iterator_t = typename type::x_iterator;
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return interleaved_view(src.width(),src.height(),(x_iterator_t)&(src(0,0)[n]), src.pixels().row_size());
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}
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};
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template <typename View, bool IsBasic> struct __nth_channel_view;
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// For basic (memory-based) views dispatch to __nth_channel_view_basic
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template <typename View>
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struct __nth_channel_view<View,true>
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{
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private:
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using src_x_iterator = typename View::x_iterator;
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// Determines whether the channels of a given pixel iterator are adjacent in memory.
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// Planar and grayscale iterators have channels adjacent in memory, whereas multi-channel interleaved and iterators with non-fundamental step do not.
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static constexpr bool adjacent =
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!iterator_is_step<src_x_iterator>::value &&
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(is_planar<src_x_iterator>::value || num_channels<View>::value == 1);
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public:
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using type = typename __nth_channel_view_basic<View,adjacent>::type;
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static type make(const View& src, int n) {
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return __nth_channel_view_basic<View,adjacent>::make(src,n);
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}
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};
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/// \brief Function object that returns a grayscale reference of the N-th channel of a given reference. Models: PixelDereferenceAdaptorConcept.
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/// \ingroup PixelDereferenceAdaptorModel
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///
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/// If the input is a pixel value or constant reference, the function object is immutable. Otherwise it is mutable (and returns non-const reference to the n-th channel)
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template <typename SrcP> // SrcP is a reference to PixelConcept (could be pixel value or const/non-const reference)
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// Examples: pixel<T,L>, pixel<T,L>&, const pixel<T,L>&, planar_pixel_reference<T&,L>, planar_pixel_reference<const T&,L>
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struct nth_channel_deref_fn
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{
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static constexpr bool is_mutable =
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pixel_is_reference<SrcP>::value && pixel_reference_is_mutable<SrcP>::value;
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private:
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using src_pixel_t = typename std::remove_reference<SrcP>::type;
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using channel_t = typename channel_type<src_pixel_t>::type;
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using const_ref_t = typename src_pixel_t::const_reference;
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using ref_t = typename pixel_reference_type<channel_t,gray_layout_t,false,is_mutable>::type;
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public:
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using const_t = nth_channel_deref_fn<const_ref_t>;
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using value_type = typename pixel_value_type<channel_t,gray_layout_t>::type;
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using const_reference = typename pixel_reference_type<channel_t,gray_layout_t,false,false>::type;
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using argument_type = SrcP;
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using reference = mp11::mp_if_c<is_mutable, ref_t, value_type>;
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using result_type = reference;
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nth_channel_deref_fn(int n=0) : _n(n) {}
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template <typename P> nth_channel_deref_fn(const nth_channel_deref_fn<P>& d) : _n(d._n) {}
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int _n; // the channel to use
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result_type operator()(argument_type srcP) const {
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return result_type(srcP[_n]);
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}
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};
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template <typename View> struct __nth_channel_view<View,false> {
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private:
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using deref_t = nth_channel_deref_fn<typename View::reference>;
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using AD = typename View::template add_deref<deref_t>;
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public:
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using type = typename AD::type;
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static type make(const View& src, int n) {
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return AD::make(src, deref_t(n));
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}
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};
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} // namespace detail
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/// \brief Given a source image view type View, returns the type of an image view over a single channel of View
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/// \ingroup ImageViewTransformationsNthChannel
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///
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/// If the channels in the source view are adjacent in memory (such as planar non-step view or single-channel view) then the
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/// return view is a single-channel non-step view.
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/// If the channels are non-adjacent (interleaved and/or step view) then the return view is a single-channel step view.
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template <typename View>
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struct nth_channel_view_type {
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private:
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BOOST_GIL_CLASS_REQUIRE(View, boost::gil, ImageViewConcept)
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using VB = detail::__nth_channel_view<View,view_is_basic<View>::value>;
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public:
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using type = typename VB::type;
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static type make(const View& src, int n) { return VB::make(src,n); }
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};
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/// \ingroup ImageViewTransformationsNthChannel
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template <typename View>
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typename nth_channel_view_type<View>::type nth_channel_view(const View& src, int n) {
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return nth_channel_view_type<View>::make(src,n);
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}
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/// \defgroup ImageViewTransformationsKthChannel kth_channel_view
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/// \ingroup ImageViewTransformations
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/// \brief single-channel (grayscale) view of the K-th channel of a given image_view. The channel index is a template parameter
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namespace detail {
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template <int K, typename View, bool AreChannelsTogether> struct __kth_channel_view_basic;
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// kth_channel_view when the channels are not adjacent in memory. This can happen for multi-channel interleaved images
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// or images with a step
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template <int K, typename View>
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struct __kth_channel_view_basic<K,View,false> {
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private:
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using channel_t = typename kth_element_type<typename View::value_type,K>::type;
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public:
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using type = typename view_type<channel_t, gray_layout_t, false, true, view_is_mutable<View>::value>::type;
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static type make(const View& src) {
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using locator_t = typename type::xy_locator;
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using x_iterator_t = typename type::x_iterator;
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using x_iterator_base_t = typename iterator_adaptor_get_base<x_iterator_t>::type;
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x_iterator_t sit(x_iterator_base_t(&gil::at_c<K>(src(0,0))),src.pixels().pixel_size());
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return type(src.dimensions(),locator_t(sit, src.pixels().row_size()));
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}
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};
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// kth_channel_view when the channels are together in memory (true for simple grayscale or planar images)
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template <int K, typename View>
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struct __kth_channel_view_basic<K,View,true> {
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private:
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using channel_t = typename kth_element_type<typename View::value_type, K>::type;
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public:
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using type = typename view_type<channel_t, gray_layout_t, false, false, view_is_mutable<View>::value>::type;
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static type make(const View& src) {
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using x_iterator_t = typename type::x_iterator;
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return interleaved_view(src.width(),src.height(),(x_iterator_t)&gil::at_c<K>(src(0,0)), src.pixels().row_size());
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}
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};
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template <int K, typename View, bool IsBasic> struct __kth_channel_view;
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// For basic (memory-based) views dispatch to __kth_channel_view_basic
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template <int K, typename View> struct __kth_channel_view<K,View,true>
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{
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private:
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using src_x_iterator = typename View::x_iterator;
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// Determines whether the channels of a given pixel iterator are adjacent in memory.
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// Planar and grayscale iterators have channels adjacent in memory, whereas multi-channel interleaved and iterators with non-fundamental step do not.
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static constexpr bool adjacent =
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!iterator_is_step<src_x_iterator>::value &&
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(is_planar<src_x_iterator>::value || num_channels<View>::value == 1);
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public:
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using type = typename __kth_channel_view_basic<K,View,adjacent>::type;
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static type make(const View& src) {
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return __kth_channel_view_basic<K,View,adjacent>::make(src);
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}
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};
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/// \brief Function object that returns a grayscale reference of the K-th channel (specified as a template parameter) of a given reference. Models: PixelDereferenceAdaptorConcept.
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/// \ingroup PixelDereferenceAdaptorModel
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///
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/// If the input is a pixel value or constant reference, the function object is immutable. Otherwise it is mutable (and returns non-const reference to the k-th channel)
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/// \tparam SrcP reference to PixelConcept (could be pixel value or const/non-const reference)
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/// Examples: pixel<T,L>, pixel<T,L>&, const pixel<T,L>&, planar_pixel_reference<T&,L>, planar_pixel_reference<const T&,L>
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template <int K, typename SrcP>
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struct kth_channel_deref_fn
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{
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static constexpr bool is_mutable =
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pixel_is_reference<SrcP>::value && pixel_reference_is_mutable<SrcP>::value;
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private:
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using src_pixel_t = typename std::remove_reference<SrcP>::type;
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using channel_t = typename kth_element_type<src_pixel_t, K>::type;
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using const_ref_t = typename src_pixel_t::const_reference;
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using ref_t = typename pixel_reference_type<channel_t,gray_layout_t,false,is_mutable>::type;
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public:
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using const_t = kth_channel_deref_fn<K,const_ref_t>;
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using value_type = typename pixel_value_type<channel_t,gray_layout_t>::type;
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using const_reference = typename pixel_reference_type<channel_t,gray_layout_t,false,false>::type;
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using argument_type = SrcP;
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using reference = mp11::mp_if_c<is_mutable, ref_t, value_type>;
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using result_type = reference;
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kth_channel_deref_fn() {}
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template <typename P> kth_channel_deref_fn(const kth_channel_deref_fn<K,P>&) {}
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result_type operator()(argument_type srcP) const {
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return result_type(gil::at_c<K>(srcP));
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}
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};
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template <int K, typename View> struct __kth_channel_view<K,View,false> {
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private:
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using deref_t = kth_channel_deref_fn<K,typename View::reference>;
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using AD = typename View::template add_deref<deref_t>;
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public:
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using type = typename AD::type;
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static type make(const View& src) {
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return AD::make(src, deref_t());
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}
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};
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} // namespace detail
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/// \brief Given a source image view type View, returns the type of an image view over a given channel of View.
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/// \ingroup ImageViewTransformationsKthChannel
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///
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/// If the channels in the source view are adjacent in memory (such as planar non-step view or single-channel view) then the
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/// return view is a single-channel non-step view.
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/// If the channels are non-adjacent (interleaved and/or step view) then the return view is a single-channel step view.
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template <int K, typename View>
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struct kth_channel_view_type {
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private:
|
BOOST_GIL_CLASS_REQUIRE(View, boost::gil, ImageViewConcept)
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using VB = detail::__kth_channel_view<K,View,view_is_basic<View>::value>;
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public:
|
using type = typename VB::type;
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static type make(const View& src) { return VB::make(src); }
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};
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|
/// \ingroup ImageViewTransformationsKthChannel
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template <int K, typename View>
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typename kth_channel_view_type<K,View>::type kth_channel_view(const View& src) {
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return kth_channel_view_type<K,View>::make(src);
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}
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|
} } // namespace boost::gil
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|
#endif
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