1 ! Copyright (C) 2014 John Benediktsson
2 ! See https://factorcode.org/license.txt for BSD license
4 USING: accessors colors kernel math math.functions
9 TUPLE: xyza x y z alpha ;
17 CONSTANT: xyz_epsilon 216/24389
18 CONSTANT: xyz_kappa 24389/27
20 CONSTANT: wp_x 0.95047
21 CONSTANT: wp_y 1.00000
22 CONSTANT: wp_z 1.08883
24 : srgb-compand ( v -- v' )
25 dup 0.0031308 <= [ 12.92 * ] [ 2.4 recip ^ 1.055 * 0.055 - ] if ;
32 [ x>> ] [ y>> ] [ z>> ] tri :> ( x y z )
33 x 3.2404542 * y -1.5371385 * z -0.4985314 * + +
34 x -0.9692660 * y 1.8760108 * z 0.0415560 * + +
35 x 0.0556434 * y -0.2040259 * z 1.0572252 * + +
36 [ srgb-compand 0.0 1.0 clamp ] tri@
38 ] [ alpha>> ] bi <rgba> ;
40 GENERIC: >xyza ( color -- xyza )
42 M: object >xyza >rgba >xyza ;
44 M: xyza >xyza ; inline
48 : invert-rgb-compand ( v -- v' )
49 dup 0.04045 <= [ 12.92 / ] [ 0.055 + 1.055 / 2.4 ^ ] if ;
56 [ red>> ] [ green>> ] [ blue>> ] tri
57 [ invert-rgb-compand ] tri@ :> ( r g b )
58 r 0.4124564 * g 0.3575761 * b 0.1804375 * + +
59 r 0.2126729 * g 0.7151522 * b 0.0721750 * + +
60 r 0.0193339 * g 0.1191920 * b 0.9503041 * + +
62 ] [ alpha>> ] bi <xyza> ;