Function replaceHead

js/load-image-meta.js:210–224

* Replaces the image head of a JPEG blob with the given one. * Returns a Promise or calls the callback with the new Blob. * * @param {Blob} blob Blob object * @param {ArrayBuffer} head New JPEG head * @param {Function} [callback] Callback function * @returns {Promise |und

(blob, head, callback)

   * @returns {Promise<Blob|null>|undefined} Combined Blob
   */
  function replaceHead(blob, head, callback) {
    var options = { maxMetaDataSize: 1024, disableMetaDataParsers: true }
    if (!callback && global.Promise) {
      return parseMetaData(blob, options).then(function (data) {
        return replaceJPEGHead(blob, data.imageHead, head)
      })
    }
    parseMetaData(
      blob,
      function (data) {
        callback(replaceJPEGHead(blob, data.imageHead, head))
      },
      options
    )
  }

  loadImage.transform = function (img, options, callback, file, data) {
    if (loadImage.requiresMetaData(options)) {