Method getImageData

utils/validate_single.js:37–43

(x, y, w, h)

  }

  getImageData(x, y, w, h) {
    const {pixels} = this;
    const len = w * h * 4;
    const startIndex = x * 4 + y * (w * 4);

    return {data: pixels.slice(startIndex, startIndex + len)};
  }
}

const PUZZLE_GAP = 8;