144 lines
6.4 KiB
C++
144 lines
6.4 KiB
C++
//
|
|
// 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_NUMERIC_RESAMPLE_HPP
|
|
#define BOOST_GIL_EXTENSION_NUMERIC_RESAMPLE_HPP
|
|
|
|
#include <boost/gil/extension/numeric/affine.hpp>
|
|
#include <boost/gil/extension/dynamic_image/dynamic_image_all.hpp>
|
|
|
|
#include <algorithm>
|
|
#include <functional>
|
|
|
|
namespace boost { namespace gil {
|
|
|
|
// Support for generic image resampling
|
|
// NOTE: The code is for example use only. It is not optimized for performance
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// resample_pixels: set each pixel in the destination view as the result of a sampling function over the transformed coordinates of the source view
|
|
////
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
template <typename MapFn> struct mapping_traits {};
|
|
|
|
/// \brief Set each pixel in the destination view as the result of a sampling function over the transformed coordinates of the source view
|
|
/// \ingroup ImageAlgorithms
|
|
///
|
|
/// The provided implementation works for 2D image views only
|
|
template <typename Sampler, // Models SamplerConcept
|
|
typename SrcView, // Models RandomAccess2DImageViewConcept
|
|
typename DstView, // Models MutableRandomAccess2DImageViewConcept
|
|
typename MapFn> // Models MappingFunctionConcept
|
|
void resample_pixels(const SrcView& src_view, const DstView& dst_view, const MapFn& dst_to_src, Sampler sampler=Sampler())
|
|
{
|
|
typename DstView::point_t dst_dims=dst_view.dimensions();
|
|
typename DstView::point_t dst_p;
|
|
|
|
for (dst_p.y=0; dst_p.y<dst_dims.y; ++dst_p.y) {
|
|
typename DstView::x_iterator xit = dst_view.row_begin(dst_p.y);
|
|
for (dst_p.x=0; dst_p.x<dst_dims.x; ++dst_p.x) {
|
|
sample(sampler, src_view, transform(dst_to_src, dst_p), xit[dst_p.x]);
|
|
}
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// resample_pixels when one or both image views are run-time instantiated.
|
|
////
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
namespace detail {
|
|
template <typename Sampler, typename MapFn>
|
|
struct resample_pixels_fn : public binary_operation_obj<resample_pixels_fn<Sampler,MapFn> > {
|
|
MapFn _dst_to_src;
|
|
Sampler _sampler;
|
|
resample_pixels_fn(const MapFn& dst_to_src, const Sampler& sampler) : _dst_to_src(dst_to_src), _sampler(sampler) {}
|
|
|
|
template <typename SrcView, typename DstView> BOOST_FORCEINLINE void apply_compatible(const SrcView& src, const DstView& dst) const {
|
|
resample_pixels(src, dst, _dst_to_src, _sampler);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// \brief resample_pixels when the source is run-time specified
|
|
/// If invoked on incompatible views, throws std::bad_cast()
|
|
/// \ingroup ImageAlgorithms
|
|
template <typename Sampler, typename ...Types1, typename V2, typename MapFn>
|
|
void resample_pixels(const any_image_view<Types1...>& src, const V2& dst, const MapFn& dst_to_src, Sampler sampler=Sampler())
|
|
{
|
|
variant2::visit(std::bind(
|
|
detail::resample_pixels_fn<Sampler, MapFn>(dst_to_src, sampler),
|
|
std::placeholders::_1,
|
|
dst), src);
|
|
}
|
|
|
|
/// \brief resample_pixels when the destination is run-time specified
|
|
/// If invoked on incompatible views, throws std::bad_cast()
|
|
/// \ingroup ImageAlgorithms
|
|
template <typename Sampler, typename V1, typename ...Types2, typename MapFn>
|
|
void resample_pixels(const V1& src, const any_image_view<Types2...>& dst, const MapFn& dst_to_src, Sampler sampler=Sampler())
|
|
{
|
|
using namespace std::placeholders;
|
|
variant2::visit(std::bind(
|
|
detail::resample_pixels_fn<Sampler, MapFn>(dst_to_src, sampler),
|
|
src,
|
|
std::placeholders::_1), dst);
|
|
}
|
|
|
|
/// \brief resample_pixels when both the source and the destination are run-time specified
|
|
/// If invoked on incompatible views, throws std::bad_cast()
|
|
/// \ingroup ImageAlgorithms
|
|
template <typename Sampler, typename ...SrcTypes, typename ...DstTypes, typename MapFn>
|
|
void resample_pixels(const any_image_view<SrcTypes...>& src, const any_image_view<DstTypes...>& dst, const MapFn& dst_to_src, Sampler sampler=Sampler()) {
|
|
variant2::visit(detail::resample_pixels_fn<Sampler,MapFn>(dst_to_src,sampler), src, dst);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// resample_subimage: copy into the destination a rotated rectangular region from the source, rescaling it to fit into the destination
|
|
////
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
// Extract into dst the rotated bounds [src_min..src_max] rotated at 'angle' from the source view 'src'
|
|
// The source coordinates are in the coordinate space of the source image
|
|
// Note that the views could also be variants (i.e. any_image_view)
|
|
template <typename Sampler, typename SrcMetaView, typename DstMetaView>
|
|
void resample_subimage(const SrcMetaView& src, const DstMetaView& dst,
|
|
double src_min_x, double src_min_y,
|
|
double src_max_x, double src_max_y,
|
|
double angle, const Sampler& sampler=Sampler()) {
|
|
double src_width = std::max<double>(src_max_x - src_min_x - 1,1);
|
|
double src_height = std::max<double>(src_max_y - src_min_y - 1,1);
|
|
double dst_width = std::max<double>((double)(dst.width()-1),1);
|
|
double dst_height = std::max<double>((double)(dst.height()-1),1);
|
|
|
|
matrix3x2<double> mat =
|
|
matrix3x2<double>::get_translate(-dst_width/2.0, -dst_height/2.0) *
|
|
matrix3x2<double>::get_scale(src_width / dst_width, src_height / dst_height)*
|
|
matrix3x2<double>::get_rotate(-angle)*
|
|
matrix3x2<double>::get_translate(src_min_x + src_width/2.0, src_min_y + src_height/2.0);
|
|
resample_pixels(src,dst,mat,sampler);
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// resize_view: Copy the source view into the destination, scaling to fit
|
|
////
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
template <typename Sampler, typename SrcMetaView, typename DstMetaView>
|
|
void resize_view(const SrcMetaView& src, const DstMetaView& dst, const Sampler& sampler=Sampler()) {
|
|
resample_subimage(src,dst,0.0,0.0,(double)src.width(),(double)src.height(),0.0,sampler);
|
|
}
|
|
|
|
} } // namespace boost::gil
|
|
|
|
#endif // BOOST_GIL_EXTENSION_NUMERIC_RESAMPLE_HPP
|