docs: Bitmap generateGradient() {
      int[][] pixels = new int[1080][1920];
      for (int y = 0; y < 1080; y++) {
        for (int x = 0; x < 1920; x++) {
          int r = (int) (y / 1080f * 255);
          int g = (int) (x / 1920f * 255);
          int b = (int) ((Math.hypot(x, y) / Math.hypot(1080, 1920)) * 255);
          pixels[y][x] = r << 16 | g << 8 | b;
        }
      }
      return new Bitmap(pixels);
    }