ceph/src/boost/boost/gil/detail/math.hpp

   1 //
   2 // Copyright 2019 Olzhas Zhumabek <anonymous.from.applecity@gmail.com>
   3 //
   4 // Use, modification and distribution are subject to the Boost Software License,
   5 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 #ifndef BOOST_GIL_IMAGE_PROCESSING_DETAIL_MATH_HPP
   9 #define BOOST_GIL_IMAGE_PROCESSING_DETAIL_MATH_HPP
  10
  11 #include <array>
  12 #include <boost/gil/extension/numeric/kernel.hpp>
  13
  14 namespace boost { namespace gil { namespace detail {
  15
  16 static constexpr double pi = 3.14159265358979323846;
  17
  18 static constexpr std::array<float, 9> dx_sobel = {{-1, 0, 1, -2, 0, 2, -1, 0, 1}};
  19 static constexpr std::array<float, 9> dx_scharr = {{-1, 0, 1, -1, 0, 1, -1, 0, 1}};
  20 static constexpr std::array<float, 9> dy_sobel = {{1, 2, 1, 0, 0, 0, -1, -2, -1}};
  21 static constexpr std::array<float, 9> dy_scharr = {{1, 1, 1, 0, 0, 0, -1, -1, -1}};
  22
  23 template <typename T, typename Allocator>
  24 inline detail::kernel_2d<T, Allocator> get_identity_kernel()
  25 {
  26     detail::kernel_2d<T, Allocator> kernel(1, 0, 0);
  27     kernel[0] = 1;
  28     return kernel;
  29 }
  30
  31 }}} // namespace boost::gil::detail
  32
  33 #endif