Method ExecuteDataWithInformation

IO/Image/vtkImageReader.cxx:368–401

------------------------------------------------------------------------------ This function reads a data from a file. The datas extent/axes are assumed to be the same as the file extent/order.

// This function reads a data from a file.  The datas extent/axes
// are assumed to be the same as the file extent/order.
void vtkImageReader::ExecuteDataWithInformation(vtkDataObject* output, vtkInformation* outInfo)
{
  vtkImageData* data = this->AllocateOutputData(output, outInfo);

  void* ptr = nullptr;

  if (!this->FileName && !this->FilePattern)
  {
    vtkErrorMacro("Either a valid FileName or FilePattern must be specified.");
    return;
  }

  if (!data->GetPointData()->GetScalars())
  {
    return;
  }
  data->GetPointData()->GetScalars()->SetName(this->ScalarArrayName);

#ifndef NDEBUG
  int* ext = data->GetExtent();
#endif
  vtkDebugMacro("Reading extent: " << ext[0] << ", " << ext[1] << ", " << ext[2] << ", " << ext[3]
                                   << ", " << ext[4] << ", " << ext[5]);

  this->ComputeDataIncrements();

  // Call the correct templated function for the output
  switch (this->GetDataScalarType())
  {
    vtkTemplateMacro(vtkImageReaderUpdate1(this, data, (VTK_TT*)(ptr)));
    default:
      vtkErrorMacro(<< "UpdateFromFile: Unknown data type");
  }
}

void vtkImageReader::ComputeTransformedSpacing(double Spacing[3])
{