GCC Code Coverage Report


Directory: gridformat/
File: gridformat/vtk/pvtr_writer.hpp
Date: 2026-10-12 17:50:57
Exec Total Coverage
Lines: 78 80 97.5%
Functions: 62 185 33.5%
Branches: 292 974 30.0%

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::PVTRWriter
7 */
8 #ifndef GRIDFORMAT_VTK_PVTR_WRITER_HPP_
9 #define GRIDFORMAT_VTK_PVTR_WRITER_HPP_
10
11 #include <ostream>
12 #include <string>
13 #include <algorithm>
14 #include <filesystem>
15 #include <array>
16 #include <tuple>
17
18 #include <gridformat/common/field.hpp>
19 #include <gridformat/common/ranges.hpp>
20 #include <gridformat/common/exceptions.hpp>
21 #include <gridformat/common/lvalue_reference.hpp>
22 #include <gridformat/common/output_file.hpp>
23
24 #include <gridformat/parallel/communication.hpp>
25 #include <gridformat/parallel/helpers.hpp>
26
27 #include <gridformat/grid/grid.hpp>
28 #include <gridformat/xml/element.hpp>
29 #include <gridformat/vtk/parallel.hpp>
30 #include <gridformat/vtk/vtr_writer.hpp>
31
32 namespace GridFormat {
33
34 /*!
35 * \ingroup VTK
36 * \brief Writer for parallel .pvtr files
37 */
38 template<Concepts::RectilinearGrid Grid,
39 Concepts::Communicator Communicator>
40 class PVTRWriter : public VTK::XMLWriterBase<Grid, PVTRWriter<Grid, Communicator>> {
41 using ParentType = VTK::XMLWriterBase<Grid, PVTRWriter<Grid, Communicator>>;
42 using CT = CoordinateType<Grid>;
43
44 static constexpr std::size_t space_dim = 3;
45 static constexpr std::size_t dim = dimension<Grid>;
46 static constexpr int root_rank = 0;
47
48 public:
49 12265 explicit PVTRWriter(LValueReferenceOf<const Grid> grid,
50 Communicator comm,
51 VTK::XMLOptions xml_opts = {})
52 12265 : ParentType(grid.get(), ".pvtr", true, xml_opts)
53
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36795 , _comm(comm)
54 12265 {}
55
56 26 const Communicator& communicator() const {
57 26 return _comm;
58 }
59
60 private:
61 Communicator _comm;
62
63 8400 PVTRWriter _with(VTK::XMLOptions xml_opts) const override {
64
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8400 return PVTRWriter{this->grid(), _comm, std::move(xml_opts)};
65 }
66
67 ✗ void _write(std::ostream&) const override {
68 ✗ throw InvalidState(
69 "PVTRWriter does not support direct export into stream. "
70 "Use overload with filename instead!"
71 );
72 }
73
74 4127 virtual void _write(const std::string& filename_with_ext) const override {
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4127 const auto& local_extents = extents(this->grid());
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4127 const auto [origin, is_negative_axis] = _get_origin_and_orientations();
77
78 4127 PVTK::StructuredParallelGridHelper helper{_comm};
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4127 const auto all_origins = Parallel::gather(_comm, origin, root_rank);
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4127 const auto all_extents = Parallel::gather(_comm, local_extents, root_rank);
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4127 const auto [exts_begin, exts_end, whole_extent, _] = helper.compute_extents_and_origin(
82 all_origins,
83 all_extents,
84 is_negative_axis
85 );
86
87
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4127 const auto my_whole_extent = Parallel::broadcast(_comm, whole_extent, root_rank);
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4127 const auto my_extent_offset = Parallel::scatter(_comm, Ranges::flat(exts_begin), root_rank);
89
90 // the collective invocations also ensure that all pieces are written before the main file,
91 // and that the main file is written before returning
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7967 Parallel::invoke_collectively(_comm, [&] () {
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2087 _write_piece(filename_with_ext, Ranges::to_array<dim>(my_extent_offset), {my_whole_extent});
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9218 }, "Writing the pieces of '" + filename_with_ext + "'");
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7245 Parallel::invoke_collectively(_comm, [&] () {
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1845 if (Parallel::rank(_comm) == 0)
97 621 _write_pvtr_file(filename_with_ext, my_whole_extent, exts_begin, exts_end);
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7296 }, "Writing '" + filename_with_ext + "'");
99 5582 }
100
101 4127 auto _get_origin_and_orientations() const {
102 std::array<CT, dim> origin;
103 std::array<bool, dim> is_negative_axis;
104
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15645 for (unsigned dir = 0; dir < dim; ++dir) {
105 11518 std::array<CT, 2> ordinates_01{0, 0};
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11518 const auto& dir_ordinates = ordinates(this->grid(), dir);
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11518 std::ranges::copy(std::views::take(dir_ordinates, 2), ordinates_01.begin());
108 11518 origin[dir] = ordinates_01[0];
109 11518 is_negative_axis[dir] = ordinates_01[1] - ordinates_01[0] < CT{0};
110 }
111 8254 return std::make_tuple(origin, is_negative_axis);
112 }
113
114 4127 void _write_piece(const std::string& par_filename,
115 const std::array<std::size_t, dim>& offset,
116 typename VTRWriter<Grid>::Domain domain) const {
117
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8254 auto writer = VTRWriter{this->grid(), this->_xml_opts}
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8254 .as_piece_for(std::move(domain))
119 .with_offset(offset);
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4127 this->copy_fields(writer);
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4608 writer.write(PVTK::piece_basefilename(par_filename, Parallel::rank(_comm)));
122 4127 }
123
124 1221 void _write_pvtr_file(const std::string& filename_with_ext,
125 const std::array<std::size_t, dim>& extents,
126 const std::vector<std::array<std::size_t, dim>>& proc_extents_begin,
127 const std::vector<std::array<std::size_t, dim>>& proc_extents_end) const {
128
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2442 XMLElement pvtk_xml("VTKFile");
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2442 pvtk_xml.set_attribute("type", "PRectilinearGrid");
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1221 XMLElement& grid = pvtk_xml.add_child("PRectilinearGrid");
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3663 grid.set_attribute("WholeExtent", VTK::CommonDetail::extents_string(extents));
133
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2442 XMLElement& ppoint_data = grid.add_child("PPointData");
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2442 XMLElement& pcell_data = grid.add_child("PCellData");
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1221 XMLElement& pcoords = grid.add_child("PCoordinates");
137 1284 std::visit([&] (const auto& encoder) {
138 1905 std::visit([&] (const auto& data_format) {
139 621 PVTK::PDataArrayHelper pdata_helper{encoder, data_format, ppoint_data};
140 621 PVTK::PDataArrayHelper cdata_helper{encoder, data_format, pcell_data};
141
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8137 std::ranges::for_each(this->_point_field_names(), [&] (const std::string& name) {
142 3679 pdata_helper.add(name, this->_get_point_field(name));
143 });
144
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8133 std::ranges::for_each(this->_cell_field_names(), [&] (const std::string& name) {
145 3678 cdata_helper.add(name, this->_get_cell_field(name));
146 });
147
148 1263 std::visit([&] <typename T> (const Precision<T>& prec) {
149
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3726 XMLElement& pdata_array = pcoords.add_child("PDataArray");
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3726 pdata_array.set_attribute("NumberOfComponents", "1");
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5589 pdata_array.set_attribute("Name", "X_" + std::to_string(i));
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5589 pdata_array.set_attribute("format", VTK::data_format_name(encoder, data_format));
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5589 pdata_array.set_attribute("type", VTK::attribute_name(prec));
155 }
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621 }, this->_xml_settings.coordinate_precision);
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621 }, this->_xml_settings.data_format);
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1221 }, this->_xml_settings.encoder);
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4821 std::ranges::for_each(Parallel::ranks(_comm), [&] (int rank) {
161 std::array<std::size_t, dim> extents_begin;
162 std::array<std::size_t, dim> extents_end;
163
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6975 for (unsigned dir = 0; dir < dim; ++dir) {
164 5130 extents_begin[dir] = proc_extents_begin[rank][dir];
165 5130 extents_end[dir] = proc_extents_end[rank][dir];
166 }
167
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3690 auto& piece = grid.add_child("Piece");
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5535 piece.set_attribute("Extent", VTK::CommonDetail::extents_string(extents_begin, extents_end));
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5535 piece.set_attribute("Source", std::filesystem::path{
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3690 PVTK::piece_basefilename(filename_with_ext, rank) + ".vtr"
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5535 }.filename());
172 });
173
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1221 this->_set_default_active_fields(pvtk_xml.get_child("PRectilinearGrid"));
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2421 write_to(filename_with_ext, [&] (std::ostream& s) {
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619 write_xml_with_version_header(pvtk_xml, s, Indentation{{.width = 2}});
177 });
178 1221 }
179 };
180
181 template<typename G, Concepts::Communicator C>
182 PVTRWriter(G&&, const C&, VTK::XMLOptions = {}) -> PVTRWriter<std::remove_cvref_t<G>, C>;
183
184 namespace Traits {
185
186 template<typename... Args>
187 struct WritesConnectivity<PVTRWriter<Args...>> : public std::false_type {};
188
189 } // namespace Traits
190 } // namespace GridFormat
191
192 #endif // GRIDFORMAT_VTK_PVTR_WRITER_HPP_
193