StaticGetWidthCallback(FcChar32 aChar, nsFontXft *aFont, void *aData)
StaticGetWidthCallback(const FcChar32 *aString, PRUint32 aLen, nsFontXft *aFont, void *aData)
StaticGetWidthCallback(FcChar32 aChar, nsFontXft *aFont, void *aData){    WidthData *data = (WidthData *)aData;    data->metrics->GetWidthCallback(aChar, aFont, aData);}