1 //
2 // Copyright 2005-2007 Adobe Systems Incorporated
3 // Copyright 2018-2020 Mateusz Loskot <mateusz at loskot dot net>
4 //
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
8 //
9 #include <boost/gil/channel.hpp>
10 #include <boost/gil/channel_algorithm.hpp>
11 #include <boost/gil/typedefs.hpp>
12
13 #include <boost/core/lightweight_test.hpp>
14
15 #include <cmath>
16 #include <cstdint>
17 #include <limits>
18
19 namespace gil = boost::gil;
20
21 // FIXME: Remove when https://github.com/boostorg/core/issues/38 happens
22 #define BOOST_GIL_TEST_IS_CLOSE(a, b, epsilon) BOOST_TEST_LT(std::fabs((a) - (b)), (epsilon))
23
applyint_minus_value24 struct int_minus_value { static std::int8_t apply() { return -64; } };
applyint_plus_value25 struct int_plus_value { static std::int8_t apply() { return 64; } };
26 using fixture = gil::scoped_channel_value
27 <
28 std::uint8_t, int_minus_value, int_plus_value
29 >;
30
test_scoped_channel_value_default_constructor()31 void test_scoped_channel_value_default_constructor()
32 {
33 fixture f;
34 std::uint8_t v = f;
35 BOOST_TEST_EQ(v, std::uint8_t{0});
36 }
37
test_scoped_channel_value_user_defined_constructors()38 void test_scoped_channel_value_user_defined_constructors()
39 {
40 fixture f{1};
41 std::uint8_t v = f;
42 BOOST_TEST_EQ(v, std::uint8_t{1});
43 }
44
test_scoped_channel_value_copy_constructors()45 void test_scoped_channel_value_copy_constructors()
46 {
47 fixture f1{128};
48 fixture f2{f1};
49
50 BOOST_TEST_EQ(std::uint8_t{f1}, std::uint8_t{128});
51 BOOST_TEST_EQ(std::uint8_t{f1}, std::uint8_t{f2});
52 }
53
test_scoped_channel_value_assignment()54 void test_scoped_channel_value_assignment()
55 {
56 fixture f;
57 f = 64;
58 std::uint8_t v = f;
59 BOOST_TEST_EQ(v, std::uint8_t{64});
60 }
61
test_scoped_channel_value_float32_t()62 void test_scoped_channel_value_float32_t()
63 {
64 auto const epsilon = std::numeric_limits<float>::epsilon();
65 // min
66 BOOST_GIL_TEST_IS_CLOSE(gil::float_point_zero<float>::apply(), 0.0, epsilon);
67 BOOST_TEST_EQ(gil::channel_traits<gil::float32_t>::min_value(), 0.0);
68 // max
69 BOOST_GIL_TEST_IS_CLOSE(gil::float_point_one<float>::apply(), 1.0, epsilon);
70 BOOST_TEST_EQ(gil::channel_traits<gil::float32_t>::max_value(), 1.0);
71 }
72
test_scoped_channel_value_float64_t()73 void test_scoped_channel_value_float64_t()
74 {
75 auto const epsilon = std::numeric_limits<double>::epsilon();
76 // min
77 BOOST_GIL_TEST_IS_CLOSE(gil::float_point_zero<double>::apply(), 0.0, epsilon);
78 BOOST_GIL_TEST_IS_CLOSE(gil::channel_traits<gil::float64_t>::min_value(), 0.0, epsilon);
79 // max
80 BOOST_GIL_TEST_IS_CLOSE(gil::float_point_one<double>::apply(), 1.0, epsilon);
81 BOOST_GIL_TEST_IS_CLOSE(gil::channel_traits<gil::float64_t>::max_value(), 1.0, epsilon);
82 }
83
test_scoped_channel_value_halfs()84 void test_scoped_channel_value_halfs()
85 {
86 // Create a double channel with range [-0.5 .. 0.5]
87 struct minus_half { static double apply() { return -0.5; } };
88 struct plus_half { static double apply() { return 0.5; } };
89 using halfs = gil::scoped_channel_value<double, minus_half, plus_half>;
90
91 auto const epsilon = std::numeric_limits<double>::epsilon();
92 BOOST_GIL_TEST_IS_CLOSE(gil::channel_traits<halfs>::min_value(), minus_half::apply(), epsilon);
93 BOOST_GIL_TEST_IS_CLOSE(gil::channel_traits<halfs>::max_value(), plus_half::apply(), epsilon);
94 // scoped channel maximum should map to the maximum
95 BOOST_GIL_TEST_IS_CLOSE(gil::channel_convert<std::uint16_t>(
96 gil::channel_traits<halfs>::max_value()), 65535, epsilon);
97 }
98
main()99 int main()
100 {
101 test_scoped_channel_value_default_constructor();
102 test_scoped_channel_value_user_defined_constructors();
103 test_scoped_channel_value_copy_constructors();
104 test_scoped_channel_value_assignment();
105 test_scoped_channel_value_float32_t();
106 test_scoped_channel_value_float64_t();
107 test_scoped_channel_value_halfs();
108
109 return ::boost::report_errors();
110 }
111