ExtFloodFill method
Implementation
int ExtFloodFill(
  ffi.Pointer<HDC__> hdc,
  int x,
  int y,
  int color,
  int type,
) {
  return (_ExtFloodFill ??= _dylib
      .lookupFunction<_c_ExtFloodFill, _dart_ExtFloodFill>('ExtFloodFill'))(
    hdc,
    x,
    y,
    color,
    type,
  );
}