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/******************************************************************************
*
* Project: GDAL
* Purpose: "scale" step of "raster pipeline"
* Author: Even Rouault <even dot rouault at spatialys.com>
*
******************************************************************************
* Copyright (c) 2025, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "gdalalg_raster_scale.h"
#include "gdal_priv.h"
#include "gdal_utils.h"
#include <cmath>
//! @cond Doxygen_Suppress
#ifndef _
#define _(x) (x)
#endif
/************************************************************************/
/* GDALRasterScaleAlgorithm::GDALRasterScaleAlgorithm() */
/************************************************************************/
GDALRasterScaleAlgorithm::GDALRasterScaleAlgorithm(bool standaloneStep)
: GDALRasterPipelineStepAlgorithm(NAME, DESCRIPTION, HELP_URL,
standaloneStep)
{
AddOutputDataTypeArg(&m_type);
AddBandArg(&m_band,
_("Select band to restrict the scaling (1-based index)"));
AddArg("src-min", 0, _("Minimum value of the source range"), &m_srcMin);
AddArg("src-max", 0, _("Maximum value of the source range"), &m_srcMax);
AddArg("dst-min", 0, _("Minimum value of the destination range"),
&m_dstMin);
AddArg("dst-max", 0, _("Maximum value of the destination range"),
&m_dstMax);
AddArg("exponent", 0,
_("Exponent to apply non-linear scaling with a power function"),
&m_exponent);
AddArg("no-clip", 0, _("Do not clip input values to [srcmin, srcmax]"),
&m_noClip);
}
/************************************************************************/
/* GDALRasterScaleAlgorithm::RunStep() */
/************************************************************************/
bool GDALRasterScaleAlgorithm::RunStep(GDALPipelineStepRunContext &)
{
auto poSrcDS = m_inputDataset[0].GetDatasetRef();
CPLAssert(poSrcDS);
CPLAssert(m_outputDataset.GetName().empty());
CPLAssert(!m_outputDataset.GetDatasetRef());
CPLStringList aosOptions;
aosOptions.AddString("-of");
aosOptions.AddString("VRT");
if (!m_type.empty())
{
aosOptions.AddString("-ot");
aosOptions.AddString(m_type.c_str());
}
aosOptions.AddString(m_band > 0 ? CPLSPrintf("-scale_%d", m_band)
: "-scale");
if (!std::isnan(m_srcMin))
{
if (std::isnan(m_srcMax))
{
ReportError(CE_Failure, CPLE_AppDefined,
"src-max must be specified when src-min is specified");
return false;
}
aosOptions.AddString(CPLSPrintf("%.17g", m_srcMin));
aosOptions.AddString(CPLSPrintf("%.17g", m_srcMax));
}
else if (!std::isnan(m_srcMax))
{
ReportError(CE_Failure, CPLE_AppDefined,
"src-min must be specified when src-max is specified");
return false;
}
if (!std::isnan(m_dstMin))
{
if (std::isnan(m_dstMax))
{
ReportError(CE_Failure, CPLE_AppDefined,
"dst-max must be specified when dst-min is specified");
return false;
}
if (std::isnan(m_srcMin))
{
aosOptions.AddString("NaN");
aosOptions.AddString("NaN");
}
aosOptions.AddString(CPLSPrintf("%.17g", m_dstMin));
aosOptions.AddString(CPLSPrintf("%.17g", m_dstMax));
}
else if (!std::isnan(m_dstMax))
{
ReportError(CE_Failure, CPLE_AppDefined,
"dst-min must be specified when dst-max is specified");
return false;
}
if (!std::isnan(m_exponent))
{
aosOptions.AddString(m_band > 0 ? CPLSPrintf("-exponent_%d", m_band)
: "-exponent");
aosOptions.AddString(CPLSPrintf("%.17g", m_exponent));
}
else if (!m_noClip)
{
aosOptions.AddString(m_band > 0 ? CPLSPrintf("-exponent_%d", m_band)
: "-exponent");
aosOptions.AddString("1");
}
if (m_noClip)
{
aosOptions.AddString("--no-clip");
}
GDALTranslateOptions *psOptions =
GDALTranslateOptionsNew(aosOptions.List(), nullptr);
auto poOutDS = std::unique_ptr<GDALDataset>(GDALDataset::FromHandle(
GDALTranslate("", GDALDataset::ToHandle(poSrcDS), psOptions, nullptr)));
GDALTranslateOptionsFree(psOptions);
const bool bRet = poOutDS != nullptr;
if (poOutDS)
{
m_outputDataset.Set(std::move(poOutDS));
}
return bRet;
}
GDALRasterScaleAlgorithmStandalone::~GDALRasterScaleAlgorithmStandalone() =
default;
//! @endcond
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