pdfjs-dist/lib/web/viewer_compatibility.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2020 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

const compatibilityParams = Object.create(null);
{
  const userAgent = typeof navigator !== "undefined" && navigator.userAgent || "";
  const platform = typeof navigator !== "undefined" && navigator.platform || "";
  const maxTouchPoints = typeof navigator !== "undefined" && navigator.maxTouchPoints || 1;
  const isAndroid = /Android/.test(userAgent);
  const isIOS = /\b(iPad|iPhone|iPod)(?=;)/.test(userAgent) || platform === "MacIntel" && maxTouchPoints > 1;

  (function checkCanvasSizeLimitation() {
    if (isIOS || isAndroid) {
      compatibilityParams.maxCanvasPixels = 5242880;
    }
  })();
}
exports.viewerCompatibilityParams = Object.freeze(compatibilityParams);