'use strict';

var index = require('../../utils/es/index.js');

/**
 * Inverts the image
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
var invert = (() => ({
  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 (index.isNodePattern(cb)) {
      cb.call(this, null, this);
    }
    return this;
  }
}));

module.exports = invert;
