Method ExecuteSimpleAlgorithm

Common/ExecutionModel/vtkCompositeDataPipeline.cxx:314–454

------------------------------------------------------------------------------ Execute a simple (non-composite-aware) filter multiple times, once per block. Collect the result in a composite dataset that is of the same structure as the input.

// block. Collect the result in a composite dataset that is of the same
// structure as the input.
void vtkCompositeDataPipeline::ExecuteSimpleAlgorithm(vtkInformation* request,
  vtkInformationVector** inInfoVec, vtkInformationVector* outInfoVec, int compositePort)
{
  vtkDebugMacro(<< "ExecuteSimpleAlgorithm");

  this->ExecuteDataStart(request, inInfoVec, outInfoVec);

  vtkInformation* outInfo = nullptr;

  if (this->GetNumberOfOutputPorts() > 0)
  {
    outInfo = outInfoVec->GetInformationObject(0);
  }
  if (!outInfo)
  {
    return;
  }

  // Make sure a valid composite data object exists for all output ports.
  this->CheckCompositeData(request, inInfoVec, outInfoVec);

  // if we have no composite inputs
  if (compositePort == -1)
  {
    return;
  }

  // Loop using the first input on the first port.
  // This might not be valid for all cases but it is a decent
  // assumption to start with.
  // TODO: Loop over all inputs
  vtkInformation* inInfo = this->GetInputInformation(compositePort, 0);
  vtkCompositeDataSet* input =
    vtkCompositeDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));

  bool compositeOutputFound = false;
  std::vector<vtkSmartPointer<vtkCompositeDataSet>> compositeOutputs;
  for (int port = 0; port < outInfoVec->GetNumberOfInformationObjects(); ++port)
  {
    compositeOutputs.emplace_back(vtkCompositeDataSet::GetData(outInfoVec, port));
    if (compositeOutputs.back())
    {
      compositeOutputFound = true;
    }
  }

  if (input && compositeOutputFound)
  {
    for (int port = 0; port < outInfoVec->GetNumberOfInformationObjects(); ++port)
    {
      if (compositeOutputs[port])
      {
        compositeOutputs[port]->PrepareForNewData();
        compositeOutputs[port]->CopyStructure(input);
        if (input && input->GetFieldData())
        {
          compositeOutputs[port]->GetFieldData()->PassData(input->GetFieldData());
        }