2 // Copyright 2005-2007 Adobe Systems Incorporated
3 // Copyright 2018 Mateusz Loskot <mateusz at loskot dot net>
5 // Distribtted under the Boost Software License, Version 1.0
6 // See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt
9 #include <boost/gil/channel.hpp>
10 #include <boost/gil/channel_algorithm.hpp>
11 #include <boost/gil/typedefs.hpp>
15 #define BOOST_TEST_MODULE test_scoped_channel_value
16 #include "unit_test.hpp"
18 namespace gil = boost::gil;
20 BOOST_AUTO_TEST_CASE(scoped_channel_float32_t)
22 auto const tolerance = btt::tolerance(std::numeric_limits<float>::epsilon());
24 BOOST_TEST(gil::float_point_zero<float>::apply() == 0.0, tolerance);
25 BOOST_TEST(gil::channel_traits<gil::float32_t>::min_value() == 0.0);
27 BOOST_TEST(gil::float_point_one<float>::apply() == 1.0, tolerance);
28 BOOST_TEST(gil::channel_traits<gil::float32_t>::max_value() == 1.0);
31 BOOST_AUTO_TEST_CASE(scoped_channel_float64_t)
33 auto const tolerance = btt::tolerance(std::numeric_limits<double>::epsilon());
35 BOOST_TEST(gil::float_point_zero<double>::apply() == 0.0, tolerance);
36 BOOST_TEST(gil::channel_traits<gil::float64_t>::min_value() == 0.0, tolerance);
38 BOOST_TEST(gil::float_point_one<double>::apply() == 1.0, tolerance);
39 BOOST_TEST(gil::channel_traits<gil::float64_t>::max_value() == 1.0, tolerance);
42 BOOST_AUTO_TEST_CASE(scoped_channel_halfs)
44 // Create a double channel with range [-0.5 .. 0.5]
45 struct minus_half { static double apply() { return -0.5; } };
46 struct plus_half { static double apply() { return 0.5; } };
47 using halfs = gil::scoped_channel_value<double, minus_half, plus_half>;
49 auto const tolerance = btt::tolerance(std::numeric_limits<double>::epsilon());
50 BOOST_TEST(gil::channel_traits<halfs>::min_value() == minus_half::apply(), tolerance);
51 BOOST_TEST(gil::channel_traits<halfs>::max_value() == plus_half::apply(), tolerance);
52 // scoped channel maximum should map to the maximum
53 BOOST_TEST(gil::channel_convert<std::uint16_t>(
54 gil::channel_traits<halfs>::max_value()) == 65535, tolerance);