added contrastYIQ util

packages/app/package.json

@@ -46,6 +46,7 @@
     "electron-log": "^4.4.8",
     "electron-squirrel-startup": "^1.0.0",
     "evite": "0.13.7",
+    "fast-average-color": "^9.2.0",
     "faye": "1.4.0",
     "feather-reactjs": "2.0.13",
     "fuse.js": "6.5.3",

packages/app/src/utils/contrastYIQ/index.js

@@ -0,0 +1,32 @@
+import { FastAverageColor } from "fast-average-color"
+
+export default class ContrastYIQ {
+    static get facInstance() {
+        return new FastAverageColor()
+    }
+
+    static async averageColor(image) {
+        return await ContrastYIQ.facInstance.getColorAsync(image)
+    }
+
+    static fromHex(hexcolor) {
+        const r = parseInt(hexcolor.substring(1, 3), 16)
+        const g = parseInt(hexcolor.substring(3, 5), 16)
+        const b = parseInt(hexcolor.substring(5, 7), 16)
+
+        const yiq = ((r * 299) + (g * 587) + (b * 114)) / 1000
+
+        return (yiq >= 128) ? "black" : "white"
+    }
+
+    static async fromUrl(url) {
+        const image = new Image()
+
+        image.src = url + "?" + new Date().getTime()
+        image.setAttribute("crossOrigin", "")
+
+        const results = await ContrastYIQ.averageColor(image)
+
+        return ContrastYIQ.fromHex(results.hex)
+    }
+}