Function vtkImageCastExecute

Imaging/Core/vtkImageCast.cxx:38–85

// This templated function executes the filter for any type of data.
template <class IT, class OT>
void vtkImageCastExecute(
  vtkImageCast* self, vtkImageData* inData, vtkImageData* outData, int outExt[6], int id, IT*, OT*)
{
  vtkImageIterator<IT> inIt(inData, outExt);
  vtkImageProgressIterator<OT> outIt(outData, outExt, self, id);

  double typeMin, typeMax, val;
  int clamp;

  // for preventing overflow
  typeMin = outData->GetScalarTypeMin();
  typeMax = outData->GetScalarTypeMax();
  clamp = self->GetClampOverflow();

  // Loop through output pixels
  while (!outIt.IsAtEnd())
  {
    IT* inSI = inIt.BeginSpan();
    OT* outSI = outIt.BeginSpan();
    OT* outSIEnd = outIt.EndSpan();
    if (clamp)
    {
      while (outSI != outSIEnd)
      {
        // Pixel operation
        val = static_cast<double>(*inSI);
        val = std::min(val, typeMax);
        val = std::max(val, typeMin);
        *outSI = static_cast<OT>(val);
        ++outSI;
        ++inSI;
      }
    }
    else
    {
      while (outSI != outSIEnd)
      {
        // now process the components
        // NB: without clamping, this cast may result in undefined behavior!
        *outSI = static_cast<OT>(*inSI);
        ++outSI;
        ++inSI;
      }
    }
    inIt.NextSpan();
    outIt.NextSpan();
  }
}

//------------------------------------------------------------------------------
template <class T>