import { isNodePattern } from '@jimp/utils';
/**
 * Inverts the image
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */

export default (function () {
  return {
    invert: function invert(cb) {
      this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
        this.bitmap.data[idx] = 255 - this.bitmap.data[idx];
        this.bitmap.data[idx + 1] = 255 - this.bitmap.data[idx + 1];
        this.bitmap.data[idx + 2] = 255 - this.bitmap.data[idx + 2];
      });

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

      return this;
    }
  };
});
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