static QPainterPath convertPath(GfxState *state, GfxPath *path, Qt::FillRule fillRule)
{
  GfxSubpath *subpath;
  double x1, y1, x2, y2, x3, y3;
  int i, j;

  QPainterPath qPath;
  qPath.setFillRule(fillRule);
  for (i = 0; i < path->getNumSubpaths(); ++i) {
    subpath = path->getSubpath(i);
    if (subpath->getNumPoints() > 0) {
      state->transform(subpath->getX(0), subpath->getY(0), &x1, &y1);
      qPath.moveTo(x1, y1);
      j = 1;
      while (j < subpath->getNumPoints()) {
	if (subpath->getCurve(j)) {
	  state->transform(subpath->getX(j), subpath->getY(j), &x1, &y1);
	  state->transform(subpath->getX(j+1), subpath->getY(j+1), &x2, &y2);
	  state->transform(subpath->getX(j+2), subpath->getY(j+2), &x3, &y3);
	  qPath.cubicTo( x1, y1, x2, y2, x3, y3);
	  j += 3;
	} else {
	  state->transform(subpath->getX(j), subpath->getY(j), &x1, &y1);
	  qPath.lineTo(x1, y1);
	  ++j;
	}
      }
      if (subpath->isClosed()) {
	qPath.closeSubpath();
      }
    }
  }
  return qPath;
}

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