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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
{
struct InterpolateTupleWorker
{
vtkIdType SrcTuple1;
vtkIdType SrcTuple2;
vtkIdType DstTuple;
double Weight;
InterpolateTupleWorker(
vtkIdType srcTuple1, vtkIdType srcTuple2, vtkIdType dstTuple, double weight)
: SrcTuple1(srcTuple1)
, SrcTuple2(srcTuple2)
, DstTuple(dstTuple)
, Weight(weight)
{
}
template <typename Array1T, typename Array2T, typename Array3T>
void operator()(Array1T* src1, Array2T* src2, Array3T* dst) const
{
// Use accessor here instead of ranges since we need to use Insert for
// legacy compat
vtkDataArrayAccessor<Array1T> s1(src1);
vtkDataArrayAccessor<Array2T> s2(src2);
vtkDataArrayAccessor<Array3T> d(dst);
typedef typename vtkDataArrayAccessor<Array3T>::APIType DestType;
const int numComps = dst->GetNumberOfComponents();
const double oneMinusT = 1. - this->Weight;
double val;
DestType valT;
for (int c = 0; c < numComps; ++c)
{
val = s1.Get(this->SrcTuple1, c) * oneMinusT + s2.Get(this->SrcTuple2, c) * this->Weight;
vtkMath::RoundDoubleToIntegralIfNecessary(val, &valT);
d.Insert(this->DstTuple, c, valT);
}
}
};
} // end anon namespace
VTK_ABI_NAMESPACE_BEGIN
//------------------------------------------------------------------------------
// Interpolate value from the two values, p1 and p2, and an
// interpolation factor, t. The interpolation factor ranges from (0,1),
// with t=0 located at p1. This method assumes that the three arrays are of
// the same type. p1 is value at index id1 in fromArray1, while, p2 is
// value at index id2 in fromArray2.
void vtkDataArray::InterpolateTuple(vtkIdType dstTuple, vtkIdType srcTuple1,
vtkAbstractArray* source1, vtkIdType srcTuple2, vtkAbstractArray* source2, double t)
{
int type = this->GetDataType();
if (!vtkDataTypesCompare(type, source1->GetDataType()) ||
!vtkDataTypesCompare(type, source2->GetDataType()))
{
vtkErrorMacro("All arrays to InterpolateValue must be of same type.");
return;
}
if (srcTuple1 >= source1->GetNumberOfTuples())
{
vtkErrorMacro("Tuple 1 out of range for provided array. "
"Requested tuple: "
<< srcTuple1
<< " "
"Tuples: "
<< source1->GetNumberOfTuples());
return;
}
if (srcTuple2 >= source2->GetNumberOfTuples())
{
vtkErrorMacro("Tuple 2 out of range for provided array. "
"Requested tuple: "
<< srcTuple2
<< " "
"Tuples: "
<< source2->GetNumberOfTuples());
return;
}
vtkDataArray* src1DA = vtkDataArray::FastDownCast(source1);
vtkDataArray* src2DA = vtkDataArray::FastDownCast(source2);
if (!src1DA || !src2DA)
{
vtkErrorMacro("Both arrays must be vtkDataArray subclasses.");
return;
}
bool fallback = type == VTK_BIT;
if (!fallback)
{
InterpolateTupleWorker worker(srcTuple1, srcTuple2, dstTuple, t);
// Use fallback if dispatch fails:
fallback = !vtkArrayDispatch::Dispatch3SameValueType::Execute(src1DA, src2DA, 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();
int numComp = source1->GetNumberOfComponents();
double in1;
double in2;
double out;
for (int c = 0; c < numComp; c++)
{
in1 = src1DA->GetComponent(srcTuple1, c);
in2 = src2DA->GetComponent(srcTuple2, c);
out = in1 + t * (in2 - in1);
// Clamp to datatype range:
out = std::max(out, typeMin);
out = std::min(out, typeMax);
// Round if needed:
if (doRound)
{
out = std::floor((out >= 0.) ? (out + 0.5) : (out - 0.5));
}
this->InsertComponent(dstTuple, c, out);
}
}
}
VTK_ABI_NAMESPACE_END
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