bb8e15c971
With the changes in PR 13361, we're now using the `CanvasPattern.setTransform()` method when rendering certain Shadings/Patterns. Note that while `CanvasPattern` itself has been supported since basically "forever", its `setTransform` method is a slightly newer addition to the specification; please refer to https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern#browser_compatibility Rather than trying to re-write PR 13361 to not use, or possibly spending time/effort (if possible) polyfilling, `CanvasPattern.setTransform()` this patch thus suggests that we simply update the *minimum* supported browser versions instead. According to the compatibility data linked above, the *minimum* supported browser versions in the PDF.js library are now as follows: - Chrome >= 68, which was released on 2018-07-24.[1] - Firefox ESR, see https://wiki.mozilla.org/Release_Management/Calendar. - Safari >= 11.1, which was release on 2018-03-29.[2] (Given that the PDF.js contributors cannot realistically test a bunch of old browsers, it's not unimaginable that some older browser versions are already not working with the PDF.js library.) Based on these changes, which we should ensure are reflected in the Wiki as well, we can also remove a number of now redundant polyfills. Furthermore we'll no longer "claim" to support Windows XP, note the `gulpfile.js` changes, which should definitely *not* be an issue given that it's no longer officially supported.[3] --- [1] According to https://en.wikipedia.org/wiki/Google_Chrome_version_history [2] According to https://en.wikipedia.org/wiki/Safari_version_history#Safari_11 [3] According to https://en.wikipedia.org/wiki/Windows_XP#End_of_support
106 lines
3.5 KiB
JavaScript
106 lines
3.5 KiB
JavaScript
/* Copyright 2017 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { isNodeJS } from "./is_node.js";
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// Skip compatibility checks for modern builds and if we already ran the module.
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if (
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(typeof PDFJSDev === "undefined" || !PDFJSDev.test("SKIP_BABEL")) &&
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(typeof globalThis === "undefined" || !globalThis._pdfjsCompatibilityChecked)
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) {
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// Provides support for globalThis in legacy browsers.
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// Support: Firefox<65, Chrome<71, Safari<12.1
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if (typeof globalThis === "undefined" || globalThis.Math !== Math) {
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// eslint-disable-next-line no-global-assign
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globalThis = require("core-js/es/global-this");
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}
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globalThis._pdfjsCompatibilityChecked = true;
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// Support: Node.js
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(function checkNodeBtoa() {
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if (globalThis.btoa || !isNodeJS) {
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return;
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}
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globalThis.btoa = function (chars) {
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// eslint-disable-next-line no-undef
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return Buffer.from(chars, "binary").toString("base64");
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};
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})();
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// Support: Node.js
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(function checkNodeAtob() {
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if (globalThis.atob || !isNodeJS) {
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return;
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}
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globalThis.atob = function (input) {
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// eslint-disable-next-line no-undef
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return Buffer.from(input, "base64").toString("binary");
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};
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})();
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// Provides support for Object.fromEntries in legacy browsers.
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// Support: Firefox<63, Chrome<73, Safari<12.1, Node.js<12.0.0
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(function checkObjectFromEntries() {
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if (Object.fromEntries) {
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return;
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}
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require("core-js/es/object/from-entries.js");
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})();
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// Provides support for *recent* additions to the Promise specification,
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// however basic Promise support is assumed to be available natively.
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// Support: Firefox<71, Chrome<76, Safari<13, Node.js<12.9.0
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(function checkPromise() {
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
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// The current image decoders are synchronous, hence `Promise` shouldn't
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// need to be polyfilled for the IMAGE_DECODERS build target.
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return;
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}
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if (globalThis.Promise.allSettled) {
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return;
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}
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globalThis.Promise = require("core-js/es/promise/index.js");
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})();
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// Support: Node.js
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(function checkReadableStream() {
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
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// The current image decoders are synchronous, hence `ReadableStream`
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// shouldn't need to be polyfilled for the IMAGE_DECODERS build target.
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return;
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}
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let isReadableStreamSupported = false;
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if (typeof ReadableStream !== "undefined") {
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// MS Edge may say it has ReadableStream but they are not up to spec yet.
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try {
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// eslint-disable-next-line no-new
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new ReadableStream({
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start(controller) {
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controller.close();
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},
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});
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isReadableStreamSupported = true;
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} catch (e) {
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// The ReadableStream constructor cannot be used.
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}
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}
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if (isReadableStreamSupported) {
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return;
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}
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globalThis.ReadableStream = require("web-streams-polyfill/dist/ponyfill.js").ReadableStream;
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})();
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}
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