104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
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//
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// Copyright 2013 Krzysztof Czainski
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// Copyright 2020 Mateusz Loskot <mateusz at loskot dot net>
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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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#include <boost/gil.hpp>
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#include <boost/gil/extension/numeric/resample.hpp>
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#include <boost/gil/extension/numeric/sampler.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <cmath>
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#include "test_utility_output_stream.hpp"
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namespace gil = boost::gil;
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// FIXME: Remove when https://github.com/boostorg/core/issues/38 happens
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#define BOOST_GIL_TEST_IS_CLOSE(a, b, epsilon) BOOST_TEST_LT(std::fabs((a) - (b)), (epsilon))
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template <class F, class I>
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struct test_map_fn
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{
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using point_t = gil::point<F>;
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using result_type = point_t;
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result_type operator()(gil::point<I> const &src) const
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{
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F x = static_cast<F>(src.x) - 0.5;
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F y = static_cast<F>(src.y) - 0.5;
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return {x, y};
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}
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};
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namespace boost { namespace gil {
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// NOTE: I suggest this could be the default behavior:
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template <typename T>
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struct mapping_traits;
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template <class F, class I>
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struct mapping_traits<test_map_fn<F, I>>
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{
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using result_type = typename test_map_fn<F, I>::result_type;
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};
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template <class F, class I>
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inline point<F> transform(test_map_fn<F, I> const &mf, point<I> const &src)
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{
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return mf(src);
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}
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}} // namespace boost::gil
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void test_bilinear_sampler_test()
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{
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// R G B
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// G W R
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// B R G
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gil::rgb8_image_t img(3, 3);
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gil::rgb8_view_t v = view(img);
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v(0, 0) = v(1, 2) = v(2, 1) = gil::rgb8_pixel_t(128, 0, 0);
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v(0, 1) = v(1, 0) = v(2, 2) = gil::rgb8_pixel_t(0, 128, 0);
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v(0, 2) = v(2, 0) = gil::rgb8_pixel_t(0, 0, 128);
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v(1, 1) = gil::rgb8_pixel_t(128, 128, 128);
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gil::rgb8_image_t dims(4, 4);
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gil::rgb8c_view_t dv = gil::const_view(dims);
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test_map_fn<double, gil::rgb8_image_t::coord_t> mf;
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gil::resample_pixels(gil::const_view(img), gil::view(dims), mf, gil::bilinear_sampler());
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BOOST_TEST_EQ(gil::rgb8_pixel_t(128, 0, 0), dv(0, 0));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 0), dv(0, 1));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(0, 64, 64), dv(0, 2));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(0, 0, 128), dv(0, 3));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 0), dv(1, 0));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 96, 32), dv(1, 1));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 64), dv(1, 2));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 0, 64), dv(1, 3));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(0, 64, 64), dv(2, 0));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 64), dv(2, 1));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(96, 64, 32), dv(2, 2));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 0), dv(2, 3));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(0, 0, 128), dv(3, 0));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 0, 64), dv(3, 1));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(64, 64, 0), dv(3, 2));
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BOOST_TEST_EQ(gil::rgb8_pixel_t(0, 128, 0), dv(3, 3));
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}
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int main()
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{
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test_bilinear_sampler_test();
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return ::boost::report_errors();
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}
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