Rebase accounting for null changes

src/spaces/oklrab.js

@@ -20,6 +20,7 @@ export default new ColorSpace({
 
 	// Note that XYZ is relative to D65
 	white: "D65",
+
 	base: OKLab,
 	fromBase (oklab) {
 		return [toe(oklab[0]), oklab[1], oklab[2]];

src/spaces/oklrch.js

@@ -1,8 +1,6 @@
 import ColorSpace from "../space.js";
 import OKLrab from "./oklrab.js";
-import {toe, toeInv} from "./okhsl.js";
-import {constrain as constrainAngle} from "../angles.js";
-import {isNone} from "../util.js";
+import lch from "./lch.js";
 
 export default new ColorSpace({
 	id: "oklrch",
@@ -25,42 +23,8 @@ export default new ColorSpace({
 	white: "D65",
 
 	base: OKLrab,
-	fromBase (oklab) {
-		// Convert to polar form
-		let [L, a, b] = oklab;
-		let h;
-		const ε = 0.0002; // chromatic components much smaller than a,b
-
-		if (Math.abs(a) < ε && Math.abs(b) < ε) {
-			h = NaN;
-		}
-		else {
-			h = Math.atan2(b, a) * 180 / Math.PI;
-		}
-
-		return [
-			L, // OKLab L is still L
-			Math.sqrt(a ** 2 + b ** 2), // Chroma
-			constrainAngle(h), // Hue, in degrees [0 to 360)
-		];
-	},
-	// Convert from polar form
-	toBase (oklch) {
-		let [L, C, h] = oklch;
-		let a, b;
-
-		// check for NaN hue
-		if (isNone(h)) {
-			a = 0;
-			b = 0;
-		}
-		else {
-			a = C * Math.cos(h * Math.PI / 180);
-			b = C * Math.sin(h * Math.PI / 180);
-		}
-
-		return [ L, a, b ];
-	},
+	fromBase: lch.fromBase,
+	toBase: lch.toBase,
 
 	formats: {
 		"color": {

test/conversions.js

@@ -483,7 +483,7 @@ const tests = {
 				{
 					name: "sRGB white (D65) to OKlrch",
 					args: "white",
-					expect: [1.0, 0.0, NaN],
+					expect: [1.0, 0.0, null],
 				},
 				{
 					name: "sRGB red (D65) to OKlrch",