mmPerPx = 1e-20f;
mmPerPx = 1e-4f;
float nsSVGLength::mmPerPixel(){  if (!mContext) {    NS_WARNING("no context in mmPerPixel()");    return 1e-20f;  }    nsCOMPtr<nsIDOMSVGNumber> num;  mContext->GetMillimeterPerPixel(getter_AddRefs(num));  NS_ASSERTION(num, "null interface");  float mmPerPx;  num->GetValue(&mmPerPx);    if (mmPerPx == 0.0f) {    NS_ASSERTION(PR_FALSE, "invalid mm/pixels");    mmPerPx = 1e-20f; // some small value  }    return mmPerPx;}