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Filename : index.js
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import { isNodePattern, throwError } from "@jimp/utils";

/**
 * Flip the image horizontally
 * @param {boolean} horizontal a Boolean, if true the image will be flipped horizontally
 * @param {boolean} vertical a Boolean, if true the image will be flipped vertically
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
function flipFn(horizontal, vertical, cb) {
  if (typeof horizontal !== "boolean" || typeof vertical !== "boolean")
    return throwError.call(
      this,
      "horizontal and vertical must be Booleans",
      cb
    );

  const bitmap = Buffer.alloc(this.bitmap.data.length);
  this.scanQuiet(
    0,
    0,
    this.bitmap.width,
    this.bitmap.height,
    function (x, y, idx) {
      const _x = horizontal ? this.bitmap.width - 1 - x : x;
      const _y = vertical ? this.bitmap.height - 1 - y : y;
      const _idx = (this.bitmap.width * _y + _x) << 2;
      const data = this.bitmap.data.readUInt32BE(idx);

      bitmap.writeUInt32BE(data, _idx);
    }
  );

  this.bitmap.data = Buffer.from(bitmap);

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

  return this;
}

export default () => ({
  flip: flipFn,
  mirror: flipFn,
});