void CairoOutputDev::updateStrokeOpacity(GfxState *state) {
  stroke_opacity = state->getStrokeOpacity();

  cairo_pattern_destroy(stroke_pattern);
  stroke_pattern = cairo_pattern_create_rgba(stroke_color.r / 65535.0,
					     stroke_color.g / 65535.0,
					     stroke_color.b / 65535.0,
					     stroke_opacity);
  
  LOG(printf ("stroke opacity: %f\n", stroke_opacity));
}

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