Method SetupFileView

IO/MPIImage/vtkMPIImageReader.cxx:203–229

//------------------------------------------------------------------------------
#ifdef VTK_USE_MPI_IO
void vtkMPIImageReader::SetupFileView(vtkMPIOpaqueFileHandle& file, const int extent[6])
{
  int arrayOfSizes[3];
  int arrayOfSubSizes[3];
  int arrayOfStarts[3];

  for (int i = 0; i < this->GetFileDimensionality(); i++)
  {
    arrayOfSizes[i] = this->DataExtent[i * 2 + 1] - this->DataExtent[i * 2] + 1;
    arrayOfSubSizes[i] = extent[i * 2 + 1] - extent[i * 2] + 1;
    arrayOfStarts[i] = extent[i * 2];
  }
  // Adjust for base size of data type and tuple size.
  int baseSize = this->GetDataScalarTypeSize() * this->NumberOfScalarComponents;
  arrayOfSizes[0] *= baseSize;
  arrayOfSubSizes[0] *= baseSize;
  arrayOfStarts[0] *= baseSize;

  // Create a view in MPIIO.
  MPI_Datatype view;
  MPICall(MPI_Type_create_subarray(this->GetFileDimensionality(), arrayOfSizes, arrayOfSubSizes,
    arrayOfStarts, MPI_ORDER_FORTRAN, MPI_BYTE, &view));
  MPICall(MPI_Type_commit(&view));
  MPICall(MPI_File_set_view(file.Handle, this->GetHeaderSize(file), MPI_BYTE, view,
    const_cast<char*>("native"), MPI_INFO_NULL));
  MPICall(MPI_Type_free(&view));
}
#else  // VTK_USE_MPI_IO
void vtkMPIImageReader::SetupFileView(vtkMPIOpaqueFileHandle&, const int[6])
{