Rec. 2100-PQ

import { registerColorSpace } from "saturon/utils";
import { MATRICES } from "saturon/math";

/**
 * @see {@link https://www.w3.org/TR/css-color-hdr-1/|CSS Color HDR Module Level 1}
 */
registerColorSpace("rec2100-pq", {
    components: ["r", "g", "b"],
    bridge: "xyz-d65",
    toLinear: (c: number) => {
        const ninv = 2 ** 14 / 2610;
        const minv = 2 ** 5 / 2523;
        const c1 = 3424 / 2 ** 12;
        const c2 = 2413 / 2 ** 7;
        const c3 = 2392 / 2 ** 7;
        const x = Math.pow(Math.max(Math.pow(c, minv) - c1, 0) / (c2 - c3 * Math.pow(c, minv)), ninv);
        const Yw = 203;
        return (x * 10000) / Yw;
    },
    fromLinear: (c: number) => {
        const Yw = 203;
        const x = (c * Yw) / 10000;
        const n = 2610 / 2 ** 14;
        const m = 2523 / 2 ** 5;
        const c1 = 3424 / 2 ** 12;
        const c2 = 2413 / 2 ** 7;
        const c3 = 2392 / 2 ** 7;
        return Math.pow((c1 + c2 * Math.pow(x, n)) / (1 + c3 * Math.pow(x, n)), m);
    },
    toBridgeMatrix: MATRICES.REC2020_to_XYZD65,
    fromBridgeMatrix: MATRICES.XYZD65_to_REC2020,
});