Method ComputeDataIncrements

IO/Image/vtkImageReader2.cxx:446–470

------------------------------------------------------------------------------ This function opens a file to determine the file size, and to automatically determine the header size.

// This function opens a file to determine the file size, and to
// automatically determine the header size.
void vtkImageReader2::ComputeDataIncrements()
{
  int idx;
  unsigned long fileDataLength;

  // Determine the expected length of the data ...
  switch (this->DataScalarType)
  {
    vtkTemplateMacro(fileDataLength = vtkImageReader2GetSize(static_cast<VTK_TT*>(nullptr)));
    default:
      vtkErrorMacro(<< "Unknown DataScalarType");
      return;
  }

  fileDataLength *= this->NumberOfScalarComponents;

  // compute the fileDataLength (in units of bytes)
  for (idx = 0; idx < 3; ++idx)
  {
    this->DataIncrements[idx] = fileDataLength;
    fileDataLength =
      fileDataLength * (this->DataExtent[idx * 2 + 1] - this->DataExtent[idx * 2] + 1);
  }
  this->DataIncrements[3] = fileDataLength;
}

//------------------------------------------------------------------------------
void vtkImageReader2::CloseFile()