Method InternalCopyAllocate

Common/DataModel/vtkDataSetAttributes.cxx:659–762

------------------------------------------------------------------------------ Allocates point data for point-by-point (or cell-by-cell) copy operation. If sze=0, then use the input DataSetAttributes to create (i.e., find initial size of) new objects; otherwise use the sze variable.

// If sze=0, then use the input DataSetAttributes to create (i.e., find
// initial size of) new objects; otherwise use the sze variable.
void vtkDataSetAttributes::InternalCopyAllocate(vtkDataSetAttributes* pd, int ctype, vtkIdType sze,
  vtkIdType ext, int shallowCopyArrays, bool createNewArrays)
{
  // Create various point data depending upon input
  //
  if (!pd)
  {
    return;
  }

  if ((ctype < COPYTUPLE) || (ctype > PASSDATA))
  {
    return;
  }

  this->RequiredArrays = this->ComputeRequiredArrays(pd, ctype);
  if (this->RequiredArrays.GetListSize() == 0)
  {
    return;
  }
  delete[] this->TargetIndices;
  this->TargetIndices = new int[pd->GetNumberOfArrays()];
  for (int i = 0; i < pd->GetNumberOfArrays(); ++i)
  {
    this->TargetIndices[i] = -1;
  }

  vtkAbstractArray* aa = nullptr;
  int attributeType;

  // If we are not copying on self
  if ((pd != this) && createNewArrays)
  {
    for (const auto& i : this->RequiredArrays)
    {
      // Create all required arrays
      aa = pd->GetAbstractArray(i);
      vtkAbstractArray* newAA;
      if (shallowCopyArrays)
      {
        newAA = aa;
      }
      else
      {
        newAA = aa->NewInstance();
        newAA->SetNumberOfComponents(aa->GetNumberOfComponents());
        newAA->CopyComponentNames(aa);
        newAA->SetName(aa->GetName());
        if (aa->HasInformation())
        {
          newAA->CopyInformation(aa->GetInformation(), /*deep=*/1);
        }
        if (sze > 0)
        {
          newAA->Allocate(sze * aa->GetNumberOfComponents(), ext);
        }
        else
        {