Fix Splash colour retrieval & show main window earlier if splash is disabled

src/renderer/themedSplash.ts

@@ -10,15 +10,49 @@ function isValidColor(color: CSSStyleValue | undefined): color is CSSUnparsedVal
     return color instanceof CSSUnparsedValue && typeof color[0] === "string" && CSS.supports("color", color[0]);
 }
 
+// https://gist.github.com/earthbound19/e7fe15fdf8ca3ef814750a61bc75b5ce
+function clamp(value: number, min: number, max: number) {
+    return Math.max(Math.min(value, max), min);
+}
+const linearToGamma = (c: number) => (c >= 0.0031308 ? 1.055 * Math.pow(c, 1 / 2.4) - 0.055 : 12.92 * c);
+
+function oklabToSRGB({ L, a, b }: { L: number; a: number; b: number }) {
+    let l = L + a * +0.3963377774 + b * +0.2158037573;
+    let m = L + a * -0.1055613458 + b * -0.0638541728;
+    let s = L + a * -0.0894841775 + b * -1.291485548;
+    l **= 3;
+    m **= 3;
+    s **= 3;
+    let R = l * +4.0767416621 + m * -3.3077115913 + s * +0.2309699292;
+    let G = l * -1.2684380046 + m * +2.6097574011 + s * -0.3413193965;
+    let B = l * -0.0041960863 + m * -0.7034186147 + s * +1.707614701;
+    R = 255 * linearToGamma(R);
+    G = 255 * linearToGamma(G);
+    B = 255 * linearToGamma(B);
+    R = Math.round(clamp(R, 0, 255));
+    G = Math.round(clamp(G, 0, 255));
+    B = Math.round(clamp(B, 0, 255));
+
+    return `rgb(${R}, ${G}, ${B})`;
+}
+
 function resolveColor(color: string) {
     const span = document.createElement("span");
     span.style.color = color;
     span.style.display = "none";
 
     document.body.append(span);
-    const rgbColor = getComputedStyle(span).color;
+    let rgbColor = getComputedStyle(span).color;
     span.remove();
 
+    if (rgbColor.startsWith("oklab(")) {
+        // scam
+        const [_, L, a, b] = rgbColor.match(/oklab\((.+?)[, ]+(.+?)[, ]+(.+?)\)/) ?? [];
+        if (L && a && b) {
+            rgbColor = oklabToSRGB({ L: parseFloat(L), a: parseFloat(a), b: parseFloat(b) });
+        }
+    }
+
     return rgbColor;
 }