Youtube Player perf

Optimizes animation calls for lower GPU/CPU consumption
当前为 2023-07-28 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Youtube Player perf
// @version      0.3
// @description  Optimizes animation calls for lower GPU/CPU consumption
// @namespace    nopeless.github.io
// @author       nopeless
// @match        https://www.youtube.com/watch?v=*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

/* global _yt_player */

(() => {
    "use strict";

    function modifyBase() {
        console.log("Overriding _yt_player methods");

        if (!window._yt_player) return console.error("YT player not avaliable, load order is wrong");

        const PV = _yt_player.PV;

        // save the original prototype
        const PVPrototype = _yt_player.PV.prototype;

        let dirty = false;

        function update(a) {
            for (var b = _yt_player.u(Object.keys(a)), c = b.next(); !c.done; c = b.next()) {
                c = c.value;

                if (this.__updateCache.get(c) !== a[c]) {
                    // console.log("updating", c, a[c]);
                    this.updateValue(c, a[c]);
                    dirty = true;
                    this.__updateCache.set(c, a[c]);
                }
            }
        }

        _yt_player.PV = function (...args) {
            // YouTube base.js update approx 2023-07-28
            // this -> args[0]
            const a = args[0];

            PV.call(this, ...args);

            a.__updateCache = new Map();

            // override update
            a.update = update;
        };

        _yt_player.PV.prototype = Object.create(PVPrototype);
        _yt_player.PV.prototype.constructor = _yt_player.PV;



        const Un = _yt_player.Un;
        let counter = 0; // up to 4

        // YouTube base.js update approx 2023-07-28
        // Nn => Un
        _yt_player.Un = (a, b, c) => {
            // don't do excessive progress bar updates
            if (b === "transform") {
                if (dirty) {
                    counter = 4;
                    // console.log("unmarking dirty");
                    dirty = false;
                }
                if (counter > 0) {
                    // console.log("updating bar");
                    counter--;
                } else {
                    return;
                }
            }
            Un(a, b, c);
        };
    }

    window.__modifyBase = modifyBase;

    const ob = new MutationObserver(mrs => {
        const l = mrs.map(mr => mr.addedNodes[0]).find(node => node && node.nodeName === "SCRIPT" && node.src && node.src.match(/\/base\.js$/));

        if (!l) return;

        l.setAttribute("onload", "__modifyBase()");

        ob.disconnect();
    });

    console.log("watching for script changes");
    ob.observe(document, { attributes: false, childList: true, subtree: true });
})();