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/******************************************************************************
*
* Project: GDAL
* Purpose: "gdal vector simplify-coverage" subcommand
* Author: Daniel Baston
*
******************************************************************************
* Copyright (c) 2025, ISciences LLC
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "gdalalg_vector_simplify_coverage.h"
#include "cpl_error.h"
#include "gdal_priv.h"
#include "gdalalg_vector_geom.h"
#include "ogr_geometry.h"
#include "ogr_geos.h"
#include "ogrsf_frmts.h"
#include <cinttypes>
#ifndef _
#define _(x) (x)
#endif
//! @cond Doxygen_Suppress
GDALVectorSimplifyCoverageAlgorithm::GDALVectorSimplifyCoverageAlgorithm(
bool standaloneStep)
: GDALVectorPipelineStepAlgorithm(NAME, DESCRIPTION, HELP_URL,
standaloneStep)
{
AddActiveLayerArg(&m_activeLayer);
AddArg("tolerance", 0, _("Distance tolerance for simplification."),
&m_opts.tolerance)
.SetPositional()
.SetRequired()
.SetMinValueIncluded(0);
AddArg("preserve-boundary", 0,
_("Whether the exterior boundary should be preserved."),
&m_opts.preserveBoundary);
}
#if defined HAVE_GEOS && \
(GEOS_VERSION_MAJOR > 3 || \
(GEOS_VERSION_MAJOR == 3 && GEOS_VERSION_MINOR >= 12))
class GDALVectorSimplifyCoverageOutputDataset final
: public GDALGeosNonStreamingAlgorithmDataset
{
public:
GDALVectorSimplifyCoverageOutputDataset(
const GDALVectorSimplifyCoverageAlgorithm::Options &opts)
: m_opts(opts)
{
}
~GDALVectorSimplifyCoverageOutputDataset() override;
bool PolygonsOnly() const override
{
return true;
}
bool SkipEmpty() const override
{
return false;
}
bool ProcessGeos() override
{
// Perform coverage simplification
GEOSGeometry *coll = GEOSGeom_createCollection_r(
m_poGeosContext, GEOS_GEOMETRYCOLLECTION, m_apoGeosInputs.data(),
static_cast<unsigned int>(m_apoGeosInputs.size()));
if (coll == nullptr)
{
return false;
}
m_apoGeosInputs.clear();
m_poGeosResultAsCollection = GEOSCoverageSimplifyVW_r(
m_poGeosContext, coll, m_opts.tolerance, m_opts.preserveBoundary);
GEOSGeom_destroy_r(m_poGeosContext, coll);
return m_poGeosResultAsCollection != nullptr;
}
private:
CPL_DISALLOW_COPY_ASSIGN(GDALVectorSimplifyCoverageOutputDataset)
const GDALVectorSimplifyCoverageAlgorithm::Options &m_opts;
};
GDALVectorSimplifyCoverageOutputDataset::
~GDALVectorSimplifyCoverageOutputDataset() = default;
bool GDALVectorSimplifyCoverageAlgorithm::RunStep(GDALPipelineStepRunContext &)
{
auto poSrcDS = m_inputDataset[0].GetDatasetRef();
auto poDstDS =
std::make_unique<GDALVectorSimplifyCoverageOutputDataset>(m_opts);
bool bFoundActiveLayer = false;
for (auto &&poSrcLayer : poSrcDS->GetLayers())
{
if (m_activeLayer.empty() ||
m_activeLayer == poSrcLayer->GetDescription())
{
if (!poDstDS->AddProcessedLayer(*poSrcLayer))
{
return false;
}
bFoundActiveLayer = true;
}
else
{
poDstDS->AddPassThroughLayer(*poSrcLayer);
}
}
if (!bFoundActiveLayer)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Specified layer '%s' was not found",
m_activeLayer.c_str());
return false;
}
m_outputDataset.Set(std::move(poDstDS));
return true;
}
#else
bool GDALVectorSimplifyCoverageAlgorithm::RunStep(GDALPipelineStepRunContext &)
{
ReportError(CE_Failure, CPLE_AppDefined,
"%s requires GDAL to be built against version 3.12 or later of "
"the GEOS library.",
NAME);
return false;
}
#endif // HAVE_GEOS
GDALVectorSimplifyCoverageAlgorithmStandalone::
~GDALVectorSimplifyCoverageAlgorithmStandalone() = default;
//! @endcond
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