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/**********************************************************************
*
* GEOS - Geometry Engine Open Source
* http://geos.osgeo.org
*
* Copyright (C) 2025 Daniel Baston
*
* This is free software; you can redistribute and/or modify it under
* the terms of the GNU Lesser General Public Licence as published
* by the Free Software Foundation.
* See the COPYING file for more information.
*
**********************************************************************/
#include <stdexcept>
#include <benchmark/benchmark.h>
#include <BenchmarkUtils.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/Geometry.h>
#include <geos/coverage/CoverageUnion.h>
#include <geos/operation/union/CoverageUnion.h>
struct SegmentSet {
static void Union(const geos::geom::GeometryCollection& coll) {
geos::operation::geounion::CoverageUnion::Union(&coll);
}
};
struct BoundaryChain {
static void Union(const geos::geom::GeometryCollection& coll) {
auto result = geos::coverage::CoverageUnion::Union(&coll);
}
};
template<typename Impl>
static void BM_CoverageUnion(benchmark::State& state) {
const auto& gfact = *geos::geom::GeometryFactory::getDefaultInstance();
auto nCells = state.range(0);
auto nx = static_cast<int>(std::ceil(std::sqrt(nCells)));
auto ny = static_cast<int>(std::ceil(std::sqrt(nCells)));
nCells = nx*ny;
geos::geom::Envelope env(0, nx, 0, ny);
auto cells = geos::benchmark::createGeometriesOnGrid(env, static_cast<std::size_t>(nCells), [&gfact](const auto& base) {
geos::geom::Envelope box(base.x, base.x + 1, base.y, base.y + 1);
return gfact.toGeometry(&box);
});
auto coll = gfact.createGeometryCollection(std::move(cells));
for (auto _ : state) {
Impl::Union(*coll);
}
}
BENCHMARK_TEMPLATE(BM_CoverageUnion, SegmentSet)->Range(1000, 1000000);
BENCHMARK_TEMPLATE(BM_CoverageUnion, BoundaryChain)->Range(1000, 1000000);
BENCHMARK_MAIN();
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