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Filename : index.js

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import { isNodePattern } from "@jimp/utils";

/**
 * Apply a ordered dithering effect
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
function dither(cb) {
  const rgb565Matrix = [1, 9, 3, 11, 13, 5, 15, 7, 4, 12, 2, 10, 16, 8, 14, 6];
  this.scanQuiet(
    0,
    0,
    this.bitmap.width,
    this.bitmap.height,
    function (x, y, idx) {
      const thresholdId = ((y & 3) << 2) + (x % 4);
      const dither = rgb565Matrix[thresholdId];
      this.bitmap.data[idx] = Math.min(this.bitmap.data[idx] + dither, 0xff);
      this.bitmap.data[idx + 1] = Math.min(
        this.bitmap.data[idx + 1] + dither,
        0xff
      );
      this.bitmap.data[idx + 2] = Math.min(
        this.bitmap.data[idx + 2] + dither,
        0xff
      );
    }
  );

  if (isNodePattern(cb)) {
    cb.call(this, null, this);
  }

  return this;
}

export default () => ({
  dither565: dither,
  dither16: dither,
});