libs/gil/test/core/channel/algorithm_channel_arithmetic.cpp

   1 //
   2 // Copyright 2005-2007 Adobe Systems Incorporated
   3 // Copyright 2018 Mateusz Loskot <mateusz at loskot dot net>
   4 //
   5 // Distributed 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_algorithm.hpp>
  10 #include <type_traits>
  11 #include <utility>
  12
  13 #define BOOST_TEST_MODULE test_algorithm_channel_arithmetic
  14 #include "unit_test.hpp"
  15 #include "test_fixture.hpp"
  16
  17 namespace gil = boost::gil;
  18 namespace fixture = boost::gil::test::fixture;
  19
  20 template <typename ChannelFixtureBase>
  21 void test_channel_arithmetic_mutable(std::false_type)  {}
  22
  23 template <typename ChannelFixtureBase>
  24 void test_channel_arithmetic_mutable(std::true_type)
  25 {
  26     using fixture_t = fixture::channel<ChannelFixtureBase>;
  27     using channel_value_t = typename fixture_t::channel_value_t;
  28     fixture_t f;
  29     channel_value_t const v = f.min_v_;
  30     channel_value_t const one = 1;
  31
  32     ++f.min_v_;
  33     f.min_v_++;
  34     --f.min_v_;
  35     f.min_v_--;
  36     BOOST_TEST(v == f.min_v_);
  37
  38     f.min_v_ += one;
  39     f.min_v_ -= one;
  40     BOOST_TEST(v == f.min_v_);
  41
  42     f.min_v_ *= one;
  43     f.min_v_ /= one;
  44     BOOST_TEST(v == f.min_v_);
  45
  46     f.min_v_ = one; // assignable to scalar
  47     BOOST_TEST(f.min_v_ == one);
  48     f.min_v_ = v; // and to value type
  49     BOOST_TEST(f.min_v_ == v);
  50
  51     // test swap
  52     channel_value_t v1 = f.min_v_;
  53     channel_value_t v2 = f.max_v_;
  54     std::swap(f.min_v_, f.max_v_);
  55     BOOST_TEST(f.min_v_ > f.max_v_);
  56     channel_value_t v3 = f.min_v_;
  57     channel_value_t v4 = f.max_v_;
  58     BOOST_TEST(v1 == v4);
  59     BOOST_TEST(v2 == v3);
  60 }
  61
  62 template <typename ChannelFixtureBase>
  63 void test_channel_arithmetic()
  64 {
  65     using fixture_t = fixture::channel<ChannelFixtureBase>;
  66     fixture_t f;
  67     BOOST_TEST(f.min_v_ * 1 == f.min_v_);
  68     BOOST_TEST(f.min_v_ / 1 == f.min_v_);
  69     BOOST_TEST((f.min_v_ + 1) + 1 == f.min_v_ + 2);
  70     BOOST_TEST((f.max_v_ - 1) - 1 == f.max_v_ - 2);
  71
  72     using is_mutable_t = std::integral_constant
  73         <
  74             bool,
  75             gil::channel_traits<typename fixture_t::channel_t>::is_mutable
  76         >;
  77     test_channel_arithmetic_mutable<ChannelFixtureBase>(is_mutable_t{});
  78 }
  79
  80 BOOST_AUTO_TEST_CASE_TEMPLATE(channel_value, Channel, fixture::channel_byte_types)
  81 {
  82     using fixture_t = fixture::channel_value<Channel>;
  83     test_channel_arithmetic<fixture_t>();
  84 }
  85
  86 BOOST_AUTO_TEST_CASE_TEMPLATE(channel_reference, Channel, fixture::channel_byte_types)
  87 {
  88     using fixture_t = fixture::channel_reference<Channel&>;
  89     test_channel_arithmetic<fixture_t>();
  90 }
  91
  92 BOOST_AUTO_TEST_CASE_TEMPLATE(
  93     channel_reference_const, Channel, fixture::channel_byte_types)
  94 {
  95     using fixture_t = fixture::channel_reference<Channel const&>;
  96     test_channel_arithmetic<fixture_t>();
  97 }
  98
  99 BOOST_AUTO_TEST_CASE_TEMPLATE(
 100     packed_channel_reference, BitField, fixture::channel_bitfield_types)
 101 {
 102     using channels565_t = fixture::packed_channels565<BitField>;
 103     test_channel_arithmetic<typename channels565_t::fixture_0_5_t>();
 104     test_channel_arithmetic<typename channels565_t::fixture_5_6_t >();
 105     test_channel_arithmetic<typename channels565_t::fixture_11_5_t>();
 106 }
 107
 108 BOOST_AUTO_TEST_CASE_TEMPLATE(
 109     packed_dynamic_channel_reference, BitField, fixture::channel_bitfield_types)
 110 {
 111     using channels565_t = fixture::packed_dynamic_channels565<BitField>;
 112     test_channel_arithmetic<typename channels565_t::fixture_5_t>();
 113     test_channel_arithmetic<typename channels565_t::fixture_6_t>();
 114 }