function IsTrueTypeInstalled: bool;
var
  {$IFDEF WIN32}
  rs : TRasterizerStatus;
  {$ELSE}
  rs : TRasterizer_Status;
  {$ENDIF}
begin
  result := false;
  if not GetRasterizerCaps(rs, sizeof(rs)) then
    exit;
  if rs.WFlags and TT_AVAILABLE <> TT_AVAILABLE then
    exit;
  if rs.WFlags and TT_ENABLED <> TT_ENABLED then
    exit;
  result := true;
end;