Function ConvertDataArrayToMCArray

IO/CatalystConduit/vtkDataObjectToConduit.cxx:231–348

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//----------------------------------------------------------------------------
bool ConvertDataArrayToMCArray(vtkDataArray* dataArray, int offset, int stride,
  conduit_cpp::Node& conduitNode, int arraySize = -1, bool external = true)
{
  stride = std::max(stride, 1);

  conduit_index_t numberOfElements;
  if (arraySize == -1)
  {
    numberOfElements = dataArray->GetNumberOfValues() / stride;
  }
  else
  {
    numberOfElements = arraySize / stride;
  }

  int dataType = dataArray->GetDataType();
  int dataTypeSize = dataArray->GetDataTypeSize();
  int arrayType = dataArray->GetArrayType();

  if (arrayType != vtkArrayTypes::VTK_AOS_DATA_ARRAY &&
    arrayType != vtkArrayTypes::VTK_SOA_DATA_ARRAY)
  {
    vtkLog(ERROR,
      "Unsupported data array type: " << dataArray->GetArrayTypeAsString() << " for array "
                                      << dataArray->GetName());
    return false;
  }

  // The code below uses the legacy GetVoidPointer on purpose to get zero copy.
  bool is_supported = true;
  if (::IsSignedIntegralType(dataType))
  {
    switch (dataType)
    {
      vtkTemplateMacro(switch (dataTypeSize) {
        case 1:
          conduit_set_array(
            conduitNode, dataArray, int8, VTK_TT, numberOfElements, offset, stride, external);
          break;

        case 2:
          conduit_set_array(
            conduitNode, dataArray, int16, VTK_TT, numberOfElements, offset, stride, external);
          break;

        case 4:
          conduit_set_array(
            conduitNode, dataArray, int32, VTK_TT, numberOfElements, offset, stride, external);
          break;

        case 8:
          conduit_set_array(
            conduitNode, dataArray, int64, VTK_TT, numberOfElements, offset, stride, external);
          break;

        default:
          is_supported = false;
      });