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/******************************************************************************
*
* Project: GDAL
* Purpose: "reclassify" step of "raster pipeline"
* Author: Daniel Baston
*
******************************************************************************
* Copyright (c) 2025, ISciences LLC
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "gdalalg_raster_reclassify.h"
#include "cpl_vsi_virtual.h"
#include "gdal_priv.h"
#include "gdal_utils.h"
#include "../frmts/vrt/vrtdataset.h"
#include "../frmts/vrt/vrtreclassifier.h"
#include <array>
//! @cond Doxygen_Suppress
#ifndef _
#define _(x) (x)
#endif
/************************************************************************/
/* GDALRasterReclassifyAlgorithm::GDALRasterReclassifyAlgorithm() */
/************************************************************************/
GDALRasterReclassifyAlgorithm::GDALRasterReclassifyAlgorithm(
bool standaloneStep)
: GDALRasterPipelineStepAlgorithm(NAME, DESCRIPTION, HELP_URL,
standaloneStep)
{
AddArg("mapping", 'm',
_("Reclassification mappings (or specify a @<filename> to point to "
"a file containing mappings"),
&m_mapping)
.SetRequired();
AddOutputDataTypeArg(&m_type);
}
/************************************************************************/
/* GDALRasterReclassifyValidateMappings */
/************************************************************************/
static bool GDALReclassifyValidateMappings(GDALDataset &input,
const std::string &mappings,
GDALDataType eDstType)
{
int hasNoData;
std::optional<double> noData =
input.GetRasterBand(1)->GetNoDataValue(&hasNoData);
if (!hasNoData)
{
noData.reset();
}
gdal::Reclassifier reclassifier;
return reclassifier.Init(mappings.c_str(), noData, eDstType) == CE_None;
}
/************************************************************************/
/* GDALRasterReclassifyCreateVRTDerived */
/************************************************************************/
static std::unique_ptr<GDALDataset>
GDALReclassifyCreateVRTDerived(GDALDataset &input, const std::string &mappings,
GDALDataType eDstType)
{
CPLXMLTreeCloser root(CPLCreateXMLNode(nullptr, CXT_Element, "VRTDataset"));
const auto nX = input.GetRasterXSize();
const auto nY = input.GetRasterYSize();
for (int iBand = 1; iBand <= input.GetRasterCount(); ++iBand)
{
const GDALDataType srcType =
input.GetRasterBand(iBand)->GetRasterDataType();
const GDALDataType bandType =
eDstType == GDT_Unknown ? srcType : eDstType;
const GDALDataType xferType = GDALDataTypeUnion(srcType, bandType);
CPLXMLNode *band =
CPLCreateXMLNode(root.get(), CXT_Element, "VRTRasterBand");
CPLAddXMLAttributeAndValue(band, "subClass", "VRTDerivedRasterBand");
CPLAddXMLAttributeAndValue(band, "dataType",
GDALGetDataTypeName(bandType));
CPLXMLNode *pixelFunctionType =
CPLCreateXMLNode(band, CXT_Element, "PixelFunctionType");
CPLCreateXMLNode(pixelFunctionType, CXT_Text, "reclassify");
CPLXMLNode *arguments =
CPLCreateXMLNode(band, CXT_Element, "PixelFunctionArguments");
CPLAddXMLAttributeAndValue(arguments, "mapping", mappings.c_str());
CPLXMLNode *sourceTransferType =
CPLCreateXMLNode(band, CXT_Element, "SourceTransferType");
CPLCreateXMLNode(sourceTransferType, CXT_Text,
GDALGetDataTypeName(xferType));
}
auto ds = std::make_unique<VRTDataset>(nX, nY);
if (ds->XMLInit(root.get(), "") != CE_None)
{
return nullptr;
};
for (int iBand = 1; iBand <= input.GetRasterCount(); ++iBand)
{
auto poSrcBand = input.GetRasterBand(iBand);
auto poDstBand =
cpl::down_cast<VRTDerivedRasterBand *>(ds->GetRasterBand(iBand));
GDALCopyNoDataValue(poDstBand, poSrcBand);
poDstBand->AddSimpleSource(poSrcBand);
}
GDALGeoTransform gt;
if (input.GetGeoTransform(gt) == CE_None)
ds->SetGeoTransform(gt);
ds->SetSpatialRef(input.GetSpatialRef());
return ds;
}
/************************************************************************/
/* GDALRasterReclassifyAlgorithm::RunStep() */
/************************************************************************/
bool GDALRasterReclassifyAlgorithm::RunStep(GDALPipelineStepRunContext &)
{
const auto poSrcDS = m_inputDataset[0].GetDatasetRef();
CPLAssert(poSrcDS);
CPLAssert(m_outputDataset.GetName().empty());
CPLAssert(!m_outputDataset.GetDatasetRef());
// Already validated by argument parser
const GDALDataType eDstType =
m_type.empty() ? GDT_Unknown : GDALGetDataTypeByName(m_type.c_str());
const auto nErrorCount = CPLGetErrorCounter();
if (!m_mapping.empty() && m_mapping[0] == '@')
{
auto f =
VSIVirtualHandleUniquePtr(VSIFOpenL(m_mapping.c_str() + 1, "r"));
if (!f)
{
ReportError(CE_Failure, CPLE_FileIO, "Cannot open %s",
m_mapping.c_str() + 1);
return false;
}
m_mapping.clear();
try
{
constexpr int MAX_CHARS_PER_LINE = 1000 * 1000;
constexpr size_t MAX_MAPPING_SIZE = 10 * 1000 * 1000;
while (const char *line =
CPLReadLine2L(f.get(), MAX_CHARS_PER_LINE, nullptr))
{
while (isspace(*line))
{
line++;
}
if (line[0])
{
if (!m_mapping.empty())
{
m_mapping.append(";");
}
const char *comment = strchr(line, '#');
if (!comment)
{
m_mapping.append(line);
}
else
{
m_mapping.append(line,
static_cast<size_t>(comment - line));
}
if (m_mapping.size() > MAX_MAPPING_SIZE)
{
ReportError(CE_Failure, CPLE_AppDefined,
"Too large mapping size");
return false;
}
}
}
}
catch (const std::exception &)
{
ReportError(CE_Failure, CPLE_OutOfMemory,
"Out of memory while ingesting mapping file");
}
}
if (nErrorCount == CPLGetErrorCounter())
{
if (!GDALReclassifyValidateMappings(*poSrcDS, m_mapping, eDstType))
{
return false;
}
m_outputDataset.Set(
GDALReclassifyCreateVRTDerived(*poSrcDS, m_mapping, eDstType));
}
return m_outputDataset.GetDatasetRef() != nullptr;
}
GDALRasterReclassifyAlgorithmStandalone::
~GDALRasterReclassifyAlgorithmStandalone() = default;
//! @endcond
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