Listing 2. Blitting a sprite onto the background

procedure TForm1.SpeedDraw1PaintProc(Sender: TObject);
var
  hr: HResult;
begin
 hr := SpeedDraw1.BackSurface.BltFast(200, 75,
          FNewSurface, FDinoRect,
          DDBLTFAST_WAIT or DDBLTFAST_SRCCOLORKEY);
 if hr <> DD_OK then
   raise EDDError.CreateFmt('No blit $%x %s', [hr, GetOleError(hr)]);
end;