multipolygon_range.cuh

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/*
 * Copyright (c) 2023, NVIDIA CORPORATION.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <cuspatial/cuda_utils.hpp>
#include <cuspatial/detail/range/enumerate_range.cuh>
#include <cuspatial/geometry/vec_2d.hpp>
#include <cuspatial/traits.hpp>
#include <cuspatial/types.hpp>
 
#include <rmm/cuda_stream_view.hpp>
 
#include <thrust/pair.h>
 
namespace cuspatial {
 
template <typename GeometryIterator,
          typename PartIterator,
          typename RingIterator,
          typename VecIterator>
class multipolygon_range {
 public:
  using geometry_it_t = GeometryIterator;
  using part_it_t     = PartIterator;
  using ring_it_t     = RingIterator;
  using point_it_t    = VecIterator;
  using point_t       = iterator_value_type<VecIterator>;
 
  using index_t   = iterator_value_type<GeometryIterator>;
  using element_t = iterator_vec_base_type<VecIterator>;
 
  multipolygon_range(GeometryIterator geometry_begin,
                     GeometryIterator geometry_end,
                     PartIterator part_begin,
                     PartIterator part_end,
                     RingIterator ring_begin,
                     RingIterator ring_end,
                     VecIterator points_begin,
                     VecIterator points_end);
 
  CUSPATIAL_HOST_DEVICE auto size() { return num_multipolygons(); }
 
  CUSPATIAL_HOST_DEVICE auto num_multipolygons();
 
  CUSPATIAL_HOST_DEVICE auto num_polygons();
 
  CUSPATIAL_HOST_DEVICE auto num_rings();
 
  CUSPATIAL_HOST_DEVICE auto num_points();
 
  CUSPATIAL_HOST_DEVICE auto multipolygon_begin();
 
  CUSPATIAL_HOST_DEVICE auto multipolygon_end();
 
  CUSPATIAL_HOST_DEVICE auto begin() { return multipolygon_begin(); }
 
  CUSPATIAL_HOST_DEVICE auto end() { return multipolygon_end(); }
 
  CUSPATIAL_HOST_DEVICE auto point_begin();
 
  CUSPATIAL_HOST_DEVICE auto point_end();
 
  CUSPATIAL_HOST_DEVICE auto geometry_offset_begin() { return _part_begin; }
 
  CUSPATIAL_HOST_DEVICE auto geometry_offset_end() { return _part_end; }
 
  CUSPATIAL_HOST_DEVICE auto part_offset_begin() { return _part_begin; }
 
  CUSPATIAL_HOST_DEVICE auto part_offset_end() { return _part_end; }
 
  CUSPATIAL_HOST_DEVICE auto ring_offset_begin() { return _ring_begin; }
 
  CUSPATIAL_HOST_DEVICE auto ring_offset_end() { return _ring_end; }
 
  template <typename IndexType>
  CUSPATIAL_HOST_DEVICE auto ring_idx_from_point_idx(IndexType point_idx);
 
  template <typename IndexType>
  CUSPATIAL_HOST_DEVICE auto part_idx_from_ring_idx(IndexType ring_idx);
 
  template <typename IndexType>
  CUSPATIAL_HOST_DEVICE auto geometry_idx_from_part_idx(IndexType part_idx);
 
  template <typename IndexType>
  CUSPATIAL_HOST_DEVICE auto operator[](IndexType multipolygon_idx);
 
  CUSPATIAL_HOST_DEVICE auto multipolygon_point_count_begin();
  CUSPATIAL_HOST_DEVICE auto multipolygon_point_count_end();
 
  CUSPATIAL_HOST_DEVICE auto multipolygon_ring_count_begin();
  CUSPATIAL_HOST_DEVICE auto multipolygon_ring_count_end();
 
  auto _segments(rmm::cuda_stream_view);
 
 
  CUSPATIAL_HOST_DEVICE auto as_multipoint_range();
 
  CUSPATIAL_HOST_DEVICE auto as_multilinestring_range();
 
 protected:
  GeometryIterator _geometry_begin;
  GeometryIterator _geometry_end;
  PartIterator _part_begin;
  PartIterator _part_end;
  RingIterator _ring_begin;
  RingIterator _ring_end;
  VecIterator _point_begin;
  VecIterator _point_end;
 
 private:
  template <typename IndexType1, typename IndexType2>
  CUSPATIAL_HOST_DEVICE bool is_valid_segment_id(IndexType1 segment_idx, IndexType2 ring_idx);
};
 
template <typename GeometryIteratorDiffType,
          typename PartIteratorDiffType,
          typename RingIteratorDiffType,
          typename VecIteratorDiffType,
          typename GeometryIterator,
          typename PartIterator,
          typename RingIterator,
          typename VecIterator>
multipolygon_range<GeometryIterator, PartIterator, RingIterator, VecIterator>
make_multipolygon_range(GeometryIteratorDiffType num_multipolygons,
                        GeometryIterator geometry_begin,
                        PartIteratorDiffType num_polygons,
                        PartIterator part_begin,
                        RingIteratorDiffType num_rings,
                        RingIterator ring_begin,
                        VecIteratorDiffType num_points,
                        VecIterator point_begin)
{
  return multipolygon_range{
    geometry_begin,
    thrust::next(geometry_begin, num_multipolygons + 1),
    part_begin,
    thrust::next(part_begin, num_polygons + 1),
    ring_begin,
    thrust::next(ring_begin, num_rings + 1),
    point_begin,
    thrust::next(point_begin, num_points),
  };
}
 
template <collection_type_id Type,
          typename T,
          typename IndexType,
          typename GeometryColumnView,
          CUSPATIAL_ENABLE_IF(Type == collection_type_id::SINGLE)>
auto make_multipolygon_range(GeometryColumnView const& polygons_column)
{
  CUSPATIAL_EXPECTS(polygons_column.geometry_type() == geometry_type_id::POLYGON,
                    "Must be polygon geometry type.");
  auto geometry_iter       = thrust::make_counting_iterator(0);
  auto const& part_offsets = polygons_column.offsets();
  auto const& ring_offsets = polygons_column.child().child(0);
  auto const& points_xy =
    polygons_column.child().child(1).child(1);  // Ignores x-y offset {0, 2, 4...}
 
  auto points_it = make_vec_2d_iterator(points_xy.template begin<T>());
 
  return multipolygon_range(geometry_iter,
                            geometry_iter + part_offsets.size(),
                            part_offsets.template begin<IndexType>(),
                            part_offsets.template end<IndexType>(),
                            ring_offsets.template begin<IndexType>(),
                            ring_offsets.template end<IndexType>(),
                            points_it,
                            points_it + points_xy.size() / 2);
}
 
template <collection_type_id Type,
          typename T,
          typename IndexType,
          CUSPATIAL_ENABLE_IF(Type == collection_type_id::MULTI),
          typename GeometryColumnView>
auto make_multipolygon_range(GeometryColumnView const& polygons_column)
{
  CUSPATIAL_EXPECTS(polygons_column.geometry_type() == geometry_type_id::POLYGON,
                    "Must be polygon geometry type.");
  auto const& geometry_offsets = polygons_column.offsets();
  auto const& part_offsets     = polygons_column.child().child(0);
  auto const& ring_offsets     = polygons_column.child().child(1).child(0);
  auto const& points_xy =
    polygons_column.child().child(1).child(1).child(1);  // Ignores x-y offset {0, 2, 4...}
 
  auto points_it = make_vec_2d_iterator(points_xy.template begin<T>());
 
  return multipolygon_range(geometry_offsets.template begin<IndexType>(),
                            geometry_offsets.template end<IndexType>(),
                            part_offsets.template begin<IndexType>(),
                            part_offsets.template end<IndexType>(),
                            ring_offsets.template begin<IndexType>(),
                            ring_offsets.template end<IndexType>(),
                            points_it,
                            points_it + points_xy.size() / 2);
};
 
}  // namespace cuspatial
 
#include <cuspatial/detail/range/multipolygon_range.cuh>