Fix the pleroma-fe jxl polyfill patch

akkoma/pleroma-fe/jxl-polyfill.patch

@@ -92,21 +92,105 @@ index 19a7e186..54a9c4af 100644
    "engines": {
      "node": ">= 16.0.0",
 diff --git a/src/App.js b/src/App.js
-index d4b3b41a..ee75815b 100644
+index d4b3b41a..ef67a6a4 100644
 --- a/src/App.js
 +++ b/src/App.js
-@@ -53,6 +53,11 @@ export default {
+@@ -53,6 +53,9 @@ export default {
    unmounted () {
      window.removeEventListener('resize', this.updateMobileState)
    },
 +  mounted() {
-+    let jxlPolyfill = document.createElement("script");
++    import("./lib/jxl.js").then(jxl => jxl.startPolyfill());
-+    jxlPolyfill.setAttribute("src", "/node_modules/jxl.js/jxl.js");
-+    document.head.appendChild(jxlPolyfill);
 +  },
    computed: {
      classes () {
        return [
+diff --git a/src/lib/jxl.js b/src/lib/jxl.js
+new file mode 100644
+index 00000000..568b5293
+--- /dev/null
++++ b/src/lib/jxl.js
+@@ -0,0 +1,80 @@
++const config = {
++  useCache: true
++};
++
++let cache, workers = {};
++
++function imgDataToDataURL(img, imgData, isCSS) {
++  const jxlSrc = img.dataset.jxlSrc;
++  if (imgData instanceof Blob) {
++    const dataURL = URL.createObjectURL(imgData);
++    if (isCSS)
++      img.style.backgroundImage = 'url("' + dataURL + '")';
++    else
++      img.src = dataURL;
++  } else if ('OffscreenCanvas' in window) {
++    const canvas = new OffscreenCanvas(imgData.width, imgData.height);
++    workers[jxlSrc].postMessage({ canvas, imgData }, [canvas]);
++    workers[jxlSrc].addEventListener('message', m => {
++      if (m.data.url && m.data.blob) {
++        if (isCSS)
++          img.style.backgroundImage = 'url("' + m.data.url + '")';
++        else
++          img.src = m.data.url;
++        config.useCache && cache && cache.put(jxlSrc, new Response(m.data.blob));
++      }
++    });
++  } else {
++    const canvas = document.createElement('canvas');
++    canvas.width = imgData.width;
++    canvas.height = imgData.height;
++    canvas.getContext('2d').putImageData(imgData, 0, 0);
++    canvas.toBlob(blob => {
++      const dataURL = URL.createObjectURL(blob);
++      if (isCSS)
++        img.style.backgroundImage = 'url("' + dataURL + '")';
++      else
++        img.src = dataURL;
++      config.useCache && cache && cache.put(jxlSrc, new Response(blob));
++    }, 'image/jpeg');
++  }
++}
++
++
++async function decode(img, isCSS) {
++  const jxlSrc = img.dataset.jxlSrc = isCSS ? getComputedStyle(img).backgroundImage.slice(5, -2) : img.currentSrc;
++  img.src = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=='; // blank 1x1 image
++  if (config.useCache) {
++    try {
++      cache = cache || await caches.open('jxl');
++    } catch (e) { }
++    const cachedImg = cache && await cache.match(jxlSrc);
++    if (cachedImg) {
++      const cachedImgData = await cachedImg.blob();
++      requestAnimationFrame(() => imgDataToDataURL(img, cachedImgData, isCSS));
++      return;
++    }
++  }
++  const res = await fetch(jxlSrc);
++  const image = await res.arrayBuffer();
++  workers[jxlSrc] = new Worker('/node_modules/jxl.js/jxl_dec.js');
++  workers[jxlSrc].postMessage({ jxlSrc, image });
++  workers[jxlSrc].addEventListener('message', m => m.data.imgData && requestAnimationFrame(() => imgDataToDataURL(img, m.data.imgData, isCSS)));
++}
++
++function handleElement(el) {
++  if (el instanceof HTMLImageElement && el.src.endsWith('.jxl')) {
++    decode(el, false);
++    return;
++  } else if (el instanceof Element && getComputedStyle(el).backgroundImage.endsWith('.jxl)'))
++    decode(el, true);
++  el.childNodes.forEach(handleElement);
++}
++
++
++export function startPolyfill() {
++  new MutationObserver(mutations => mutations.forEach(mutation => {
++    mutation.addedNodes.forEach(handleElement);
++  })).observe(document.documentElement, { subtree: true, childList: true });
++  handleElement(document.documentElement); // Run the polyfill once on the full DOM
++}
 diff --git a/yarn.lock b/yarn.lock
 index bbceba0b..92cfd7cd 100644
 --- a/yarn.lock