if (!IsASCIIFontName(aFamily)) return PR_TRUE;
FontEnumCallback(const nsString& aFamily, PRBool aGeneric, void *aData){  if (!IsASCIIFontName(aFamily))    return PR_TRUE;      nsCAutoString name;  name.AssignWithConversion(aFamily.get());  ToLowerCase(name);    nsFontMetricsXlib* metrics = (nsFontMetricsXlib*) aData;  metrics->mFonts.AppendCString(name);  metrics->mFontIsGeneric.AppendElement((void*) aGeneric);    if (aGeneric) {    metrics->mGeneric = metrics->mFonts.CStringAt(metrics->mFonts.Count() - 1);    return PR_FALSE;  }  return PR_TRUE;}