Rename chromium to baked in, clip to rec2020, return if in gamut

apps/gamut-mapping/gradients.js

@@ -12,7 +12,7 @@ let app = createApp({
 		const urlToColor = params.get("to");
 		const from =  urlFromColor || "oklch(90% .8 250)";
 		const to = urlToColor || "oklch(40% .1 20)";
-		const methods = ["none", "clip", "scale-lh", "css", "raytrace", "edge-seeker", "chromium"];
+		const methods = ["none", "clip", "scale-lh", "css", "raytrace", "edge-seeker", "baked-in"];
 		const runResults = {};
 		methods.forEach(method => runResults[method] = []);
 		return {

apps/gamut-mapping/methods.js

@@ -50,10 +50,15 @@ const methods = {
 			return new Color("p3-linear", scaledCoords).to("p3");
 		},
 	},
-	"chromium": {
-		label: "Chromium",
-		description: "A port of the Chromium implementation",
+	"baked-in": {
+		label: "Baked in",
+		description: "A port of the Chromium implementation, mapping to an approximation of the rec2020 gamut.",
 		compute: (color) => {
+			// Implementation difference: The reference algorithm does not appear to
+			// return early for in-gamut colors.
+			if (color.inGamut("rec2020")) {
+				return color;
+			}
 			const oklab = color.to("oklab");
 			const [l, a, b] = oklab.coords;
 			// Constants for the normal vector of the plane formed by white, black, and
@@ -167,7 +172,10 @@ const methods = {
 			}
 
 			// Attenuate the ab coordinate by alpha.
-			return oklab.set({a: alpha * a, b: alpha * b});
+			return oklab.set({a: alpha * a, b: alpha * b})
+			// Implementation difference: The reference algorithm does not include a
+			// final clip, so some colors may be outside of `rec2020`.
+				.toGamut({method: "clip", space: "rec2020"});
 		},
 	},
 	"raytrace": {