static BWImage utfToImage(S text) {
  byte[] data = toUtf8(text);
  int h = 12, w = data.length+2;
  BWImage img = new BWImage(w, h, 1f);
  for (int i = 0; i < l(data); i++) {
    img.setPixel(i+1, 0, 0f);
    img.setPixel(i+1, 11, 0f);
    for (int b = 0; b < 8; b++)
      if (bitSet(data[i], 7-b))
        img.setPixel(i+1, b+2, 0f);
  }
  ret img;
}