initial commit. phase 1 complete

frontend/node_modules/culori/src/hwb/convertRgbToHwb.js

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+/*
+	RGB to HWB converter
+	--------------------
+
+	References:
+		* https://drafts.csswg.org/css-color/#hwb-to-rgb
+		* https://en.wikipedia.org/wiki/HWB_color_model
+		* http://alvyray.com/Papers/CG/HWB_JGTv208.pdf
+ */
+
+import convertRgbToHsv from '../hsv/convertRgbToHsv.js';
+
+export default function convertRgbToHwb(rgba) {
+	let hsv = convertRgbToHsv(rgba);
+	if (hsv === undefined) return undefined;
+	let res = {
+		mode: 'hwb',
+		w: (1 - hsv.s) * hsv.v,
+		b: 1 - hsv.v
+	};
+	if (hsv.h !== undefined) res.h = hsv.h;
+	if (hsv.alpha !== undefined) res.alpha = hsv.alpha;
+	return res;
+}