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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
#ifndef vtkArrayInterpolate_txx
#define vtkArrayInterpolate_txx
#include "vtkArrayExtentsList.h"
#include "vtkArrayWeights.h"
VTK_ABI_NAMESPACE_BEGIN
template <typename T>
void vtkInterpolate(vtkTypedArray<T>* source_array, const vtkArrayExtentsList& source_slices,
const vtkArrayWeights& source_weights, const vtkArrayExtents& target_slice,
vtkTypedArray<T>* target_array)
{
if (!target_array->GetExtents().Contains(target_slice))
{
vtkGenericWarningMacro(<< "Target array does not contain target slice.");
return;
}
if (source_slices.GetCount() != source_weights.GetCount())
{
vtkGenericWarningMacro(<< "Source slice and weight counts must match.");
return;
}
for (int i = 0; i != source_slices.GetCount(); ++i)
{
if (!target_slice.SameShape(source_slices[i]))
{
vtkGenericWarningMacro(<< "Source and target slice shapes must match: " << source_slices[i]
<< " versus " << target_slice);
return;
}
}
// Zero-out the target storage ...
const vtkIdType n_begin = 0;
const vtkIdType n_end = target_slice.GetSize();
vtkArrayCoordinates target_coordinates;
for (vtkIdType n = n_begin; n != n_end; ++n)
{
target_slice.GetLeftToRightCoordinatesN(n, target_coordinates);
target_array->SetValue(target_coordinates, 0);
}
// Accumulate results ...
vtkArrayCoordinates source_coordinates;
for (vtkIdType n = n_begin; n != n_end; ++n)
{
target_slice.GetLeftToRightCoordinatesN(n, target_coordinates);
for (int source = 0; source != source_slices.GetCount(); ++source)
{
source_slices[source].GetLeftToRightCoordinatesN(n, source_coordinates);
target_array->SetValue(target_coordinates,
target_array->GetValue(target_coordinates) +
(source_array->GetValue(source_coordinates) * source_weights[source]));
}
}
}
VTK_ABI_NAMESPACE_END
#endif
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