TextFit

function TextFit(

  Rp: PRastPort;

  const String_: STRPTR;

  StrLen: LongWord;

  TextExtent_: PTextExtent;

  ConstrainingExtent: PTextExtent;

  StrDirection: LongInt;

  ConstrainingBitWidth: LongWord;

  ConstrainingBitHeight: LongWord

):LongWord;