import RGBColorSpace from "../rgbspace.js";

// convert an array of linear-light rec2020 values to CIE XYZ
// using  D65 (no chromatic adaptation)
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
// 0 is actually calculated as  4.994106574466076e-17
const toXYZ_M = [
	[ 0.6369580483012914, 0.14461690358620832,  0.1688809751641721  ],
	[ 0.2627002120112671, 0.6779980715188708,   0.05930171646986196 ],
	[ 0.000000000000000,  0.028072693049087428, 1.060985057710791   ],
];

// from ITU-R BT.2124-0 Annex 2 p.3
const fromXYZ_M = [
	[  1.716651187971268,  -0.355670783776392, -0.253366281373660  ],
	[ -0.666684351832489,   1.616481236634939,  0.0157685458139111 ],
	[  0.017639857445311,  -0.042770613257809,  0.942103121235474  ],
];

export default new RGBColorSpace({
	id: "rec2020-linear",
	cssId: "--rec2020-linear",
	name: "Linear REC.2020",
	white: "D65",
	toXYZ_M,
	fromXYZ_M,
});