Method RequestData

Common/ExecutionModel/vtkImageAlgorithm.cxx:39–74

------------------------------------------------------------------------------ This is the superclasses style of Execute method. Convert it into an imaging style Execute method.

// This is the superclasses style of Execute method.  Convert it into
// an imaging style Execute method.
int vtkImageAlgorithm::RequestData(vtkInformation* request,
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
  // the default implementation is to do what the old pipeline did find what
  // output is requesting the data, and pass that into ExecuteData

  // which output port did the request come from
  int outputPort = request->Get(vtkDemandDrivenPipeline::FROM_OUTPUT_PORT());

  // if output port is negative then that means this filter is calling the
  // update directly, in that case just assume port 0
  if (outputPort == -1)
  {
    outputPort = 0;
  }

  // get the data object
  vtkInformation* outInfo = outputVector->GetInformationObject(outputPort);
  // call ExecuteData
  this->SetErrorCode(vtkErrorCode::NoError);
  if (outInfo)
  {
    this->ExecuteDataWithInformation(outInfo->Get(vtkDataObject::DATA_OBJECT()), outInfo);
  }
  else
  {
    this->ExecuteData(nullptr);
  }
  // Check for any error set by downstream filter (IO in most case)
  if (this->GetErrorCode())
  {
    return 0;
  }

  return 1;
}

//------------------------------------------------------------------------------
vtkTypeBool vtkImageAlgorithm::ProcessRequest(