index.js

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));

var _utils = require("@jimp/utils");

/**
 * Displaces the image based on the provided displacement map
 * @param {object} map the source Jimp instance
 * @param {number} offset the maximum displacement value
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
var _default = function _default() {
  return {
    displace: function displace(map, offset, cb) {
      if ((0, _typeof2["default"])(map) !== 'object' || map.constructor !== this.constructor) {
        return _utils.throwError.call(this, 'The source must be a Jimp image', cb);
      }

      if (typeof offset !== 'number') {
        return _utils.throwError.call(this, 'factor must be a number', cb);
      }

      var source = this.cloneQuiet();
      this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
        var displacement = map.bitmap.data[idx] / 256 * offset;
        displacement = Math.round(displacement);
        var ids = this.getPixelIndex(x + displacement, y);
        this.bitmap.data[ids] = source.bitmap.data[idx];
        this.bitmap.data[ids + 1] = source.bitmap.data[idx + 1];
        this.bitmap.data[ids + 2] = source.bitmap.data[idx + 2];
      });

      if ((0, _utils.isNodePattern)(cb)) {
        cb.call(this, null, this);
      }

      return this;
    }
  };
};

exports["default"] = _default;
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