void ArthurOutputDev::updateLineJoin(GfxState *state)
{
  switch (state->getLineJoin()) {
  case 0:
    m_currentPen.setJoinStyle(Qt::MiterJoin);
    break;
  case 1:
    m_currentPen.setJoinStyle(Qt::RoundJoin);
    break;
  case 2:
    m_currentPen.setJoinStyle(Qt::BevelJoin);
    break;
  }
  m_painter->setPen(m_currentPen);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.