Enlarge YouTube Chat Profile Pictures (HD Version with Caching)

Enlarges YouTube chat profile pictures on mouse over, shows HD version, returns to normal after 3 seconds. Caches HD images for faster display using Tampermonkey caching.
当前为 2024-10-23 提交的版本，查看最新版本。
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// ==UserScript==
// @name         Enlarge YouTube Chat Profile Pictures (HD Version with Caching)
// @namespace    http://tampermonkey.net/
// @version      1.3
// @description  Enlarges YouTube chat profile pictures on mouse over, shows HD version, returns to normal after 3 seconds. Caches HD images for faster display using Tampermonkey caching.
// @author       Nick2bad4u
// @match        https://www.youtube.com/*
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @license      UnLicense
// ==/UserScript==

(function() {
    'use strict';

    let debounceTimeout;
    const CACHE_TTL_MS = 24 * 60 * 60 * 1000; // 24 hours in milliseconds
    const preloadedImages = new Map();

    // Load cache from Tampermonkey storage
    function loadCache() {
        const cache = GM_getValue('profilePicCache', {});
        const now = Date.now();
        // Clear out expired cache entries
        Object.keys(cache).forEach(key => {
            if (now - cache[key].timestamp > CACHE_TTL_MS) {
                delete cache[key]; // Remove expired entry
            }
        });
        GM_setValue('profilePicCache', cache); // Update cache after removing expired entries
        return cache;
    }

    // Save cache to Tampermonkey storage
    function saveCache(cache) {
        GM_setValue('profilePicCache', cache);
    }

    let cache = loadCache(); // Load the cache once when the script runs

    // Preload HD image
    function preloadHDImage(src) {
        const hdSrc = src.replace(/=s32-c/, '=s800-c'); // Adjust as needed for HD
        if (!preloadedImages.has(hdSrc)) {
            if (cache[hdSrc]) {
                // If in persistent cache, load directly from cache
                preloadedImages.set(hdSrc, cache[hdSrc].url);
            } else {
                // Preload HD image and store in cache
                const img = new Image();
                img.src = hdSrc;
                preloadedImages.set(hdSrc, hdSrc); // Store in memory
                cache[hdSrc] = { url: hdSrc, timestamp: Date.now() }; // Cache with timestamp
                saveCache(cache); // Save the updated cache
            }
        }
    }

    // Function to enlarge profile pictures, show HD image, add black outline, and shift to the right
    function enlargeProfilePic(event) {
        clearTimeout(debounceTimeout);
        debounceTimeout = setTimeout(() => {
            const img = event.target;
            const originalSrc = img.src;
            const hdSrc = originalSrc.replace(/=s32-c/, '=s800-c'); // Increase the size to 800px
            img.dataset.originalSrc = originalSrc;  // Store the original src
            // Swap in the HD version, check preloadedImages cache
            img.src = preloadedImages.get(hdSrc) || hdSrc;
            img.style.transform = 'scale(6) translateX(20px)';
            img.style.transition = 'transform 0.2s ease';
            img.style.border = '1px solid black';
            img.style.zIndex = '9999';
            img.style.position = 'relative';
            // Reset after 3 seconds
            setTimeout(() => {
                resetProfilePic(img);
            }, 3000);
        }, 100);
    }

    // Function to reset profile pictures to original size and source
    function resetProfilePic(img) {
        img.src = img.dataset.originalSrc || img.src;  // Restore the original src if it was replaced
        img.style.transform = 'scale(1) translateX(0)';
        img.style.border = 'none';
        img.style.zIndex = 'auto';
        img.style.position = 'static';
    }

    // Add event listeners to profile pictures
    function addEventListeners() {
        const profilePics = document.querySelectorAll('.h-5.w-5.inline.align-middle.rounded-full.flex-none');
        profilePics.forEach(pic => {
            preloadHDImage(pic.src);  // Preload HD image
            pic.addEventListener('mouseover', enlargeProfilePic);
        });
    }

    // Observe changes in the chat to dynamically add event listeners
    const observer = new MutationObserver(() => {
        addEventListeners();
    });
    observer.observe(document.body, { childList: true, subtree: true });

    // Initial call to add event listeners
    addEventListeners();

})();
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