added caching for mica effect, improving startup time

src/main/base/browserwindow.ts

@@ -622,7 +622,10 @@ export class BrowserWindow {
             const wpBase64: string = await readFileSync(wpPath, 'base64')
             // add the data:image properties
             const wpData: string = `data:image/png;base64,${wpBase64}`
-            event.returnValue = wpData;
+            event.returnValue = {
+                path: wpPath,
+                data: wpData
+            };
         })
 
         ipcMain.handle("reinstall-widevine-cdm", () => {

src/renderer/main/mica.js

@@ -1,3 +1,5 @@
+import { CiderCache } from "./cidercache.js"
+
 async function spawnMica() {
     if (typeof window.micaSpawned !== "undefined") {
         return
@@ -19,20 +21,38 @@ async function spawnMica() {
     let lastScreenWidth;
     let lastScreenHeight;
 
+    let regen = true
     let imgSrc = await ipcRenderer.sendSync("get-wallpaper")
+
+    let micaCache = await CiderCache.getCache("mica-cache")
+    if (!micaCache) {
+        micaCache = {
+            path: "",
+            data: ""
+        }
+    }
+    if (micaCache.path == imgSrc.path) {
+        regen = false
+        imgSrc = micaCache
+    }
     let canvas = document.createElement('canvas');
     let ctx = canvas.getContext('2d');
     let img = new Image();
-    img.src = imgSrc;
+    img.src = imgSrc.data;
     img.onload = function () {
         canvas.width = img.width;
         canvas.height = img.height;
         ctx.drawImage(img, 0, 0);
+        if (regen) {
             for (let i = 0; i < blurIterations; i++) {
                 StackBlur.canvasRGB(canvas, 0, 0, img.width, img.height, 128);
             }
+            micaCache.path = imgSrc.path
+            micaCache.data = canvas.toDataURL()
+            CiderCache.putCache("mica-cache", micaCache)
+        }
         let imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);
-        micaDiv.style.backgroundImage = `url(${canvas.toDataURL()})`;
+        micaDiv.style.backgroundImage = `url(${micaCache.data})`;
         document.body.appendChild(micaDiv);
         // on animation finished set animation to unset
         micaDiv.addEventListener('animationend', function () {