ceph/src/boost/libs/gil/test/extension/toolbox/channel_view.cpp

   1 //
   2 // Copyright 2013 Christian Henning
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 #include <boost/gil.hpp>
   9 #include <boost/gil/extension/toolbox/metafunctions/channel_view.hpp>
  10
  11 #include <boost/core/lightweight_test.hpp>
  12
  13 #include <type_traits>
  14
  15 namespace gil = boost::gil;
  16
  17 void test_channel_view()
  18 {
  19     using kth_channel_view_t
  20         = gil::kth_channel_view_type<0, gil::rgb8_view_t::const_t>::type;
  21     using channel_view_t
  22         = gil::channel_view_type<gil::red_t, gil::rgb8_view_t::const_t>::type;
  23
  24     static_assert(std::is_same
  25         <
  26             kth_channel_view_t,
  27             channel_view_t
  28         >::value,
  29         "");
  30
  31     gil::rgb8_image_t img(100, 100);
  32     kth_channel_view_t const kth0 = gil::kth_channel_view<0>(gil::const_view(img));
  33     BOOST_TEST_EQ(kth0.num_channels(), 1u);
  34
  35     channel_view_t const red = gil::channel_view<gil::red_t>(gil::const_view(img));
  36     BOOST_TEST_EQ(red.num_channels(), 1u);
  37 }
  38
  39 int main()
  40 {
  41     test_channel_view();
  42
  43     return boost::report_errors();
  44 }