void ArthurOutputDev::updateFillColor(GfxState *state)
{
  GfxRGB rgb;
  QColor brushColour = m_currentBrush.color();
  state->getFillRGB(&rgb);
  brushColour.setRgbF(colToDbl(rgb.r), colToDbl(rgb.g), colToDbl(rgb.b), brushColour.alphaF());
  m_currentBrush.setColor(brushColour);
}

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