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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkDataArray.h"
#include "vtkArrayDispatch.h"
namespace
{
//------------InterpolateTuple workers------------------------------------------
struct InterpolateMultiTupleWorker
{
vtkIdType DestTuple;
vtkIdType* TupleIds;
vtkIdType NumTuples;
double* Weights;
InterpolateMultiTupleWorker(
vtkIdType destTuple, vtkIdType* tupleIds, vtkIdType numTuples, double* weights)
: DestTuple(destTuple)
, TupleIds(tupleIds)
, NumTuples(numTuples)
, Weights(weights)
{
}
template <typename Array1T, typename Array2T>
void operator()(Array1T* src, Array2T* dst) const
{
// Use vtkDataArrayAccessor here instead of a range, since we need to use
// Insert for legacy compat
vtkDataArrayAccessor<Array1T> s(src);
vtkDataArrayAccessor<Array2T> d(dst);
typedef typename vtkDataArrayAccessor<Array2T>::APIType DestType;
int numComp = src->GetNumberOfComponents();
for (int c = 0; c < numComp; ++c)
{
double val = 0.;
for (vtkIdType tupleId = 0; tupleId < this->NumTuples; ++tupleId)
{
vtkIdType t = this->TupleIds[tupleId];
double weight = this->Weights[tupleId];
val += weight * static_cast<double>(s.Get(t, c));
}
DestType valT;
vtkMath::RoundDoubleToIntegralIfNecessary(val, &valT);
d.Insert(this->DestTuple, c, valT);
}
}
};
} // end anon namespace
VTK_ABI_NAMESPACE_BEGIN
//------------------------------------------------------------------------------
// Interpolate array value from other array value given the
// indices and associated interpolation weights.
// This method assumes that the two arrays are of the same time.
void vtkDataArray::InterpolateTuple(
vtkIdType dstTupleIdx, vtkIdList* tupleIds, vtkAbstractArray* source, double* weights)
{
if (!vtkDataTypesCompare(this->GetDataType(), source->GetDataType()))
{
vtkErrorMacro("Cannot interpolate arrays of different type.");
return;
}
vtkDataArray* da = vtkDataArray::FastDownCast(source);
if (!da)
{
vtkErrorMacro(<< "Source array is not a vtkDataArray.");
return;
}
int numComps = this->GetNumberOfComponents();
if (da->GetNumberOfComponents() != numComps)
{
vtkErrorMacro("Number of components do not match: Source: "
<< source->GetNumberOfComponents() << " Dest: " << this->GetNumberOfComponents());
return;
}
vtkIdType numIds = tupleIds->GetNumberOfIds();
vtkIdType* ids = tupleIds->GetPointer(0);
bool fallback = da->GetDataType() == VTK_BIT || this->GetDataType() == VTK_BIT;
if (!fallback)
{
InterpolateMultiTupleWorker worker(dstTupleIdx, ids, numIds, weights);
// Use fallback if dispatch fails.
fallback = !vtkArrayDispatch::Dispatch2SameValueType::Execute(da, this, worker);
}
// Fallback to a separate implementation that checks vtkDataArray::GetDataType
// rather than relying on API types, since we'll need to round differently
// depending on type, and the API type for vtkDataArray is always double.
if (fallback)
{
bool doRound = !(this->GetDataType() == VTK_FLOAT || this->GetDataType() == VTK_DOUBLE);
double typeMin = this->GetDataTypeMin();
double typeMax = this->GetDataTypeMax();
for (int c = 0; c < numComps; ++c)
{
double val = 0.;
for (vtkIdType j = 0; j < numIds; ++j)
{
val += weights[j] * da->GetComponent(ids[j], c);
}
// Clamp to data type range:
val = std::max(val, typeMin);
val = std::min(val, typeMax);
// Round for floating point types:
if (doRound)
{
val = std::floor((val >= 0.) ? (val + 0.5) : (val - 0.5));
}
this->InsertComponent(dstTupleIdx, c, val);
}
}
}
VTK_ABI_NAMESPACE_END
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