boost/geometry/srs/projections/grids.hpp

   1 // Boost.Geometry
   2
   3 // This file was modified by Oracle on 2018, 2019.
   4 // Modifications copyright (c) 2018, 2019, Oracle and/or its affiliates.
   5 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
   6
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_GEOMETRY_SRS_PROJECTIONS_GRIDS_HPP
  12 #define BOOST_GEOMETRY_SRS_PROJECTIONS_GRIDS_HPP
  13
  14
  15 #include <boost/geometry/srs/projections/impl/pj_gridinfo.hpp>
  16
  17 #include <fstream>
  18
  19
  20 namespace boost { namespace geometry
  21 {
  22
  23
  24 namespace projections { namespace detail
  25 {
  26
  27
  28 struct grids_tag {};
  29 struct shared_grids_tag {};
  30
  31
  32 }} // namespace projections::detail
  33
  34 namespace srs
  35 {
  36
  37 class grids
  38 {
  39 public:
  40     std::size_t size() const
  41     {
  42         return gridinfo.size();
  43     }
  44
  45     bool empty() const
  46     {
  47         return gridinfo.empty();
  48     }
  49
  50     typedef projections::detail::grids_tag tag;
  51
  52     projections::detail::pj_gridinfo gridinfo;
  53 };
  54
  55 struct ifstream_policy
  56 {
  57     typedef std::ifstream stream_type;
  58
  59     static inline void open(stream_type & is, std::string const& gridname)
  60     {
  61         is.open(gridname.c_str(), std::ios::binary);
  62     }
  63 };
  64
  65 template
  66 <
  67     typename StreamPolicy = srs::ifstream_policy,
  68     typename Grids = grids
  69 >
  70 struct grids_storage
  71 {
  72     typedef StreamPolicy stream_policy_type;
  73     typedef Grids grids_type;
  74
  75     grids_storage()
  76     {}
  77
  78     explicit grids_storage(stream_policy_type const& policy)
  79         : stream_policy(policy)
  80     {}
  81
  82     stream_policy_type stream_policy;
  83     grids_type hgrids;
  84 };
  85
  86
  87 template <typename GridsStorage = grids_storage<> >
  88 class projection_grids
  89 {
  90 public:
  91     projection_grids(GridsStorage & storage)
  92         : m_storage_ptr(boost::addressof(storage))
  93     {}
  94
  95     typedef GridsStorage grids_storage_type;
  96
  97     GridsStorage & grids_storage() const
  98     {
  99         return *m_storage_ptr;
 100     }
 101
 102 private:
 103     GridsStorage * const m_storage_ptr;
 104
 105 public:
 106     std::vector<std::size_t> hindexes;
 107 };
 108
 109
 110 template <typename GridsStorage = grids_storage<> >
 111 struct transformation_grids
 112 {
 113     explicit transformation_grids(GridsStorage & storage)
 114         : src_grids(storage)
 115         , dst_grids(storage)
 116     {}
 117
 118     projection_grids<GridsStorage> src_grids;
 119     projection_grids<GridsStorage> dst_grids;
 120 };
 121
 122
 123 namespace detail
 124 {
 125
 126 struct empty_grids_storage {};
 127 struct empty_projection_grids {};
 128
 129 } // namespace detail
 130
 131
 132 template <>
 133 struct transformation_grids<detail::empty_grids_storage>
 134 {
 135     detail::empty_projection_grids src_grids;
 136     detail::empty_projection_grids dst_grids;
 137 };
 138
 139
 140 }}} // namespace boost::geometry::srs
 141
 142
 143 #endif // BOOST_GEOMETRY_SRS_PROJECTIONS_GRIDS_HPP