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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkToConstantArrayStrategy.h"
#include "vtkArrayDispatch.h"
#include "vtkConstantArray.h"
#include "vtkDataArrayRange.h"
#include "vtkObjectFactory.h"
#include "vtkSMPTools.h"
#include "vtkSmartPointer.h"
namespace
{
using Dispatch = vtkArrayDispatch::DispatchByArray<vtkArrayDispatch::AllArrays>;
template <typename ValueType>
struct ThreadedCheckingWorklet
{
bool IsConstant = true;
ValueType Value;
double Tolerance;
ThreadedCheckingWorklet(ValueType val, double tol)
: Value(val)
, Tolerance(tol)
{
}
template <class Iterator>
void operator()(Iterator begin, Iterator end)
{
for (auto it = begin; it != end; ++it)
{
if (std::abs(static_cast<double>(*it - this->Value)) > this->Tolerance)
{
this->IsConstant = false;
break;
}
}
}
};
struct CheckConstantWorklet
{
template <typename ArrayT>
void operator()(ArrayT* arr, double tol, bool& isConstant) const
{
using VType = vtk::GetAPIType<ArrayT>;
auto range = vtk::DataArrayValueRange(arr);
if (!range.size())
{
isConstant = false;
return;
}
ThreadedCheckingWorklet<VType> tcWorker(range[0], tol);
vtkSMPTools::For(range.begin(), range.end(), tcWorker);
isConstant = tcWorker.IsConstant;
}
};
struct GenerateConstantWorklet
{
template <typename ArrayT>
void operator()(ArrayT* arr, vtkSmartPointer<vtkDataArray>& cArr) const
{
using VType = vtk::GetAPIType<ArrayT>;
vtkNew<vtkConstantArray<VType>> constant;
auto range = vtk::DataArrayValueRange(arr);
constant->SetBackend(std::make_shared<vtkConstantImplicitBackend<VType>>(range[0]));
constant->SetNumberOfComponents(arr->GetNumberOfComponents());
constant->SetNumberOfTuples(arr->GetNumberOfTuples());
constant->SetName(arr->GetName());
cArr = constant;
}
};
}
VTK_ABI_NAMESPACE_BEGIN
//-------------------------------------------------------------------------
vtkObjectFactoryNewMacro(vtkToConstantArrayStrategy);
//-------------------------------------------------------------------------
void vtkToConstantArrayStrategy::PrintSelf(std::ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << std::flush;
}
//-------------------------------------------------------------------------
vtkToImplicitStrategy::Optional vtkToConstantArrayStrategy::EstimateReduction(vtkDataArray* arr)
{
if (!arr)
{
vtkWarningMacro("Cannot transform nullptr to constant array.");
return vtkToImplicitStrategy::Optional();
}
vtkIdType nVals = arr->GetNumberOfValues();
if (!nVals)
{
return vtkToImplicitStrategy::Optional();
}
bool isConstant = false;
::CheckConstantWorklet worker;
if (!::Dispatch::Execute(arr, worker, this->Tolerance, isConstant))
{
worker(arr, this->Tolerance, isConstant);
}
return isConstant ? vtkToImplicitStrategy::Optional(1.0 / nVals)
: vtkToImplicitStrategy::Optional();
}
//-------------------------------------------------------------------------
vtkSmartPointer<vtkDataArray> vtkToConstantArrayStrategy::Reduce(vtkDataArray* arr)
{
vtkSmartPointer<vtkDataArray> res = nullptr;
if (!arr)
{
vtkWarningMacro("Cannot transform nullptr to constant array.");
return res;
}
vtkIdType nVals = arr->GetNumberOfValues();
if (!nVals)
{
return res;
}
::GenerateConstantWorklet worker;
if (!::Dispatch::Execute(arr, worker, res))
{
worker(arr, res);
}
return res;
}
VTK_ABI_NAMESPACE_END
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