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- //
- // Copyright 2005-2007 Adobe Systems Incorporated
- // Copyright 2018 Mateusz Loskot <mateusz at loskot dot net>
- //
- // Distribtted 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
- //
- #include <boost/gil/channel.hpp>
- #include <boost/gil/channel_algorithm.hpp>
- #include <boost/gil/typedefs.hpp>
- #include <cstdint>
- #include <limits>
- #define BOOST_TEST_MODULE test_scoped_channel_value
- #include "unit_test.hpp"
- namespace gil = boost::gil;
- struct int_minus_value { static std::int8_t apply() { return -64; } };
- struct int_plus_value { static std::int8_t apply() { return 64; } };
- using fixture = gil::scoped_channel_value
- <
- std::uint8_t, int_minus_value, int_plus_value
- >;
- BOOST_AUTO_TEST_CASE(scoped_channel_value_default_constructor)
- {
- fixture f;
- std::uint8_t v = f;
- BOOST_TEST(v == std::uint8_t{0});
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_user_defined_constructors)
- {
- fixture f{1};
- std::uint8_t v = f;
- BOOST_TEST(v == std::uint8_t{1});
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_copy_constructors)
- {
- fixture f1{128};
- fixture f2{f1};
- BOOST_TEST(std::uint8_t{f1} == std::uint8_t{128});
- BOOST_TEST(std::uint8_t{f1} == std::uint8_t{f2});
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_assignment)
- {
- fixture f;
- f = 64;
- std::uint8_t v = f;
- BOOST_TEST(v == std::uint8_t{64});
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_float32_t)
- {
- auto const tolerance = btt::tolerance(std::numeric_limits<float>::epsilon());
- // min
- BOOST_TEST(gil::float_point_zero<float>::apply() == 0.0, tolerance);
- BOOST_TEST(gil::channel_traits<gil::float32_t>::min_value() == 0.0);
- // max
- BOOST_TEST(gil::float_point_one<float>::apply() == 1.0, tolerance);
- BOOST_TEST(gil::channel_traits<gil::float32_t>::max_value() == 1.0);
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_float64_t)
- {
- auto const tolerance = btt::tolerance(std::numeric_limits<double>::epsilon());
- // min
- BOOST_TEST(gil::float_point_zero<double>::apply() == 0.0, tolerance);
- BOOST_TEST(gil::channel_traits<gil::float64_t>::min_value() == 0.0, tolerance);
- // max
- BOOST_TEST(gil::float_point_one<double>::apply() == 1.0, tolerance);
- BOOST_TEST(gil::channel_traits<gil::float64_t>::max_value() == 1.0, tolerance);
- }
- BOOST_AUTO_TEST_CASE(scoped_channel_value_halfs)
- {
- // Create a double channel with range [-0.5 .. 0.5]
- struct minus_half { static double apply() { return -0.5; } };
- struct plus_half { static double apply() { return 0.5; } };
- using halfs = gil::scoped_channel_value<double, minus_half, plus_half>;
- auto const tolerance = btt::tolerance(std::numeric_limits<double>::epsilon());
- BOOST_TEST(gil::channel_traits<halfs>::min_value() == minus_half::apply(), tolerance);
- BOOST_TEST(gil::channel_traits<halfs>::max_value() == plus_half::apply(), tolerance);
- // scoped channel maximum should map to the maximum
- BOOST_TEST(gil::channel_convert<std::uint16_t>(
- gil::channel_traits<halfs>::max_value()) == 65535, tolerance);
- }
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