GCC Code Coverage Report

Directory: gridformat/
File: gridformat/vtk/pvti_writer.hpp
Date: 2025-04-11 15:08:41
Exec Total Coverage
Lines: 65 67 97.0%
Functions: 38 76 50.0%
Branches: 145 282 51.4%
Line Branch Exec Source
1 // SPDX-FileCopyrightText: 2022-2023 Dennis Gläser <dennis.glaeser@iws.uni-stuttgart.de>
2 // SPDX-License-Identifier: MIT
3 /*!
4 * \file
5 * \ingroup VTK
6 * \copydoc GridFormat::PVTIWriter
7 */
8 #ifndef GRIDFORMAT_VTK_PVTI_WRITER_HPP_
9 #define GRIDFORMAT_VTK_PVTI_WRITER_HPP_
10
11 #include <ostream>
12 #include <string>
13 #include <fstream>
14 #include <algorithm>
15 #include <filesystem>
16 #include <array>
17 #include <tuple>
18 #include <cmath>
19
20 #include <gridformat/common/field.hpp>
21 #include <gridformat/common/ranges.hpp>
22 #include <gridformat/common/exceptions.hpp>
23 #include <gridformat/common/lvalue_reference.hpp>
24
25 #include <gridformat/parallel/communication.hpp>
26 #include <gridformat/parallel/helpers.hpp>
27
28 #include <gridformat/grid/grid.hpp>
29 #include <gridformat/xml/element.hpp>
30 #include <gridformat/vtk/parallel.hpp>
31 #include <gridformat/vtk/vti_writer.hpp>
32
33 namespace GridFormat {
34
35 /*!
36 * \ingroup VTK
37 * \brief Writer for parallel .pvti files
38 */
39 template<Concepts::ImageGrid Grid,
40 Concepts::Communicator Communicator>
41 class PVTIWriter : public VTK::XMLWriterBase<Grid, PVTIWriter<Grid, Communicator>> {
42 using ParentType = VTK::XMLWriterBase<Grid, PVTIWriter<Grid, Communicator>>;
43 using CT = CoordinateType<Grid>;
44
45 static constexpr std::size_t dim = dimension<Grid>;
46 static constexpr int root_rank = 0;
47
48 public:
49 12292 explicit PVTIWriter(LValueReferenceOf<const Grid> grid,
50 Communicator comm,
51 VTK::XMLOptions xml_opts = {})
52 12292 : ParentType(grid.get(), ".pvti", true, xml_opts)
53
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 36876 , _comm(comm)
54 12292 {}
55
56 52 const Communicator& communicator() const {
57 52 return _comm;
58 }
59
60 private:
61 Communicator _comm;
62
63 8400 PVTIWriter _with(VTK::XMLOptions xml_opts) const override {
64
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 8400 return PVTIWriter{this->grid(), _comm, std::move(xml_opts)};
65 }
66
67 ✗ void _write(std::ostream&) const override {
68 ✗ throw InvalidState(
69 "PVTIWriter does not support direct export into stream. "
70 "Use overload with filename instead!"
71 );
72 }
73
74 4174 virtual void _write(const std::string& filename_with_ext) const override {
75
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 4174 const auto& local_origin = origin(this->grid());
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 4174 const auto& local_extents = extents(this->grid());
77
78 4174 PVTK::StructuredParallelGridHelper helper{_comm};
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 4174 const auto all_origins = Parallel::gather(_comm, local_origin, root_rank);
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 4174 const auto all_extents = Parallel::gather(_comm, local_extents, root_rank);
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 4174 const auto is_negative_axis = VTK::CommonDetail::structured_grid_axis_orientation(spacing(this->grid()));
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 8348 const auto [exts_begin, exts_end, whole_extent, origin] = helper.compute_extents_and_origin(
83 all_origins,
84 all_extents,
85 is_negative_axis,
86
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 8348 basis(this->grid())
87 );
88
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 4174 const auto my_whole_extent = Parallel::broadcast(_comm, whole_extent, root_rank);
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 4174 const auto my_whole_origin = Parallel::broadcast(_comm, origin, root_rank);
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 4174 const auto my_extent_offset = Parallel::scatter(_comm, Ranges::flat(exts_begin), root_rank);
92
93
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 4174 _write_piece(filename_with_ext, Ranges::to_array<dim>(my_extent_offset), {my_whole_origin, my_whole_extent});
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 4174 Parallel::barrier(_comm); // ensure all pieces finished successfully
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 4174 if (Parallel::rank(_comm) == 0)
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 1399 _write_pvti_file(filename_with_ext, my_whole_origin, my_whole_extent, exts_begin, exts_end);
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 4174 Parallel::barrier(_comm); // ensure .pvti file is written before returning
98 4174 }
99
100 4174 void _write_piece(const std::string& par_filename,
101 const std::array<std::size_t, dim>& offset,
102 typename VTIWriter<Grid>::Domain domain) const {
103
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 8348 auto writer = VTIWriter{this->grid(), this->_xml_opts}
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 8348 .as_piece_for(std::move(domain))
105 .with_offset(offset);
106
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 4174 this->copy_fields(writer);
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 4174 writer.write(PVTK::piece_basefilename(par_filename, Parallel::rank(_comm)));
108 4174 }
109
110 1399 void _write_pvti_file(const std::string& filename_with_ext,
111 const std::array<CT, dim>& origin,
112 const std::array<std::size_t, dim>& extents,
113 const std::vector<std::array<std::size_t, dim>>& proc_extents_begin,
114 const std::vector<std::array<std::size_t, dim>>& proc_extents_end) const {
115
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 1399 std::ofstream file_stream(filename_with_ext, std::ios::out);
116
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 2798 XMLElement pvtk_xml("VTKFile");
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 2798 pvtk_xml.set_attribute("type", "PImageData");
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 1399 XMLElement& grid = pvtk_xml.add_child("PImageData");
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 4197 grid.set_attribute("WholeExtent", VTK::CommonDetail::extents_string(extents));
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 4197 grid.set_attribute("Origin", VTK::CommonDetail::number_string_3d(origin));
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 4197 grid.set_attribute("Spacing", VTK::CommonDetail::number_string_3d(spacing(this->grid())));
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 4197 grid.set_attribute("Direction", VTK::CommonDetail::direction_string(basis(this->grid())));
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 2798 XMLElement& ppoint_data = grid.add_child("PPointData");
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 1399 XMLElement& pcell_data = grid.add_child("PCellData");
128 1492 std::visit([&] (const auto& encoder) {
129 2207 std::visit([&] (const auto& data_format) {
130 715 PVTK::PDataArrayHelper pdata_helper{encoder, data_format, ppoint_data};
131 715 PVTK::PDataArrayHelper cdata_helper{encoder, data_format, pcell_data};
132
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 8387 std::ranges::for_each(this->_point_field_names(), [&] (const std::string& name) {
133 3720 pdata_helper.add(name, this->_get_point_field(name));
134 });
135
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 8383 std::ranges::for_each(this->_cell_field_names(), [&] (const std::string& name) {
136 3719 cdata_helper.add(name, this->_get_cell_field(name));
137 });
138
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 715 }, this->_xml_settings.data_format);
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 1399 }, this->_xml_settings.encoder);
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 5511 std::ranges::for_each(Parallel::ranks(_comm), [&] (int rank) {
142 std::array<std::size_t, dim> extents_begin;
143 std::array<std::size_t, dim> extents_end;
144
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 7994 for (unsigned dir = 0; dir < dim; ++dir) {
145 5876 extents_begin[dir] = proc_extents_begin[rank][dir];
146 5876 extents_end[dir] = proc_extents_end[rank][dir];
147 }
148
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 4236 auto& piece = grid.add_child("Piece");
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 6354 piece.set_attribute("Extent", VTK::CommonDetail::extents_string(extents_begin, extents_end));
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 6354 piece.set_attribute("Source", std::filesystem::path{
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 4236 PVTK::piece_basefilename(filename_with_ext, rank) + ".vti"
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 6354 }.filename());
154 });
155
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 1399 this->_set_default_active_fields(pvtk_xml.get_child("PImageData"));
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 1399 write_xml_with_version_header(pvtk_xml, file_stream, Indentation{{.width = 2}});
158 1399 }
159 };
160
161 template<typename G, Concepts::Communicator C>
162 PVTIWriter(G&&, const C&, VTK::XMLOptions = {}) -> PVTIWriter<std::remove_cvref_t<G>, C>;
163
164 namespace Traits {
165
166 template<typename... Args>
167 struct WritesConnectivity<PVTIWriter<Args...>> : public std::false_type {};
168
169 } // namespace Traits
170 } // namespace GridFormat
171
172 #endif // GRIDFORMAT_VTK_PVTI_WRITER_HPP_
173