mica improvements

- moved mica rendering to backend
- improvements to spanning wallpapers

src/main/base/browserwindow.ts

@@ -1,5 +1,5 @@
 import {join} from "path";
-import {app, BrowserWindow as bw, ipcMain, ShareMenu, shell} from "electron";
+import {app, BrowserWindow as bw, ipcMain, ShareMenu, shell, screen} from "electron";
 import * as windowStateKeeper from "electron-window-state";
 import * as express from "express";
 import * as getPort from "get-port";
@@ -745,15 +745,28 @@ export class BrowserWindow {
             return json;
         })
 
-        ipcMain.on("get-wallpaper", async (event) => {
+        ipcMain.on("get-wallpaper", async (event, args) => {
             const wpPath: string = await wallpaper.get();
-            // get the wallpaper and encode it to base64 then return
-            const wpBase64: string = await readFileSync(wpPath, 'base64')
-            // add the data:image properties
-            const wpData: string = `data:image/png;base64,${wpBase64}`
+            const Jimp = require("jimp")
+            const img = await Jimp.read(wpPath)
+            const blurAmount = args.blurAmount ?? 256
+            if(blurAmount) {
+                img.blur(blurAmount)
+            }
+            const screens = await screen.getAllDisplays()
+            const width = screens.reduce((a, b) => a + b.size.width, 0)
+            const height = screens.reduce((a, b) => a + b.size.height, 0)
+
+            img.cover(width, height, Jimp.HORIZONTAL_ALIGN_LEFT | Jimp.VERTICAL_ALIGN_MIDDLE)
+            const result = await img.getBase64Async(Jimp.MIME_PNG)
+
             event.returnValue = {
                 path: wpPath,
-                data: wpData
+                data: result,
+                res: {
+                    width: width,
+                    height: height
+                }
             };
         })