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Add OKLCH utilities

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This commit is contained in:
Andrew Kvalheim 2024-04-22 14:58:28 -07:00
parent d0f724fb39
commit a9f123991d
2 changed files with 63 additions and 2 deletions
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1
Provisioning.md
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@ -47,6 +47,7 @@ sudo nix-channel --add 'https://github.com/NixOS/nixos-hardware/archive/master.t
# User
nix-channel --add "https://github.com/nix-community/home-manager/archive/release-$RELEASE.tar.gz" 'home-manager'
nix-channel --add 'https://github.com/misterio77/nix-colors/archive/main.tar.gz' 'nix-colors'
nix-channel --add 'https://github.com/xddxdd/nix-math/archive/master.tar.gz' 'nix-math'
nix-channel --add 'https://nixos.org/channels/nixos-unstable' 'unstable'
nix-channel --add 'https://github.com/nix-community/nix-vscode-extensions/archive/master.tar.gz' 'community-vscode-extensions'
```

64
common/resources/lib.nix
View file

@ -1,9 +1,42 @@
{ lib }:
let
inherit (builtins) add split stringLength;
inherit (lib) concatLines fold isList max removeSuffix splitString;
inherit (builtins) add floor mapAttrs split stringLength;
inherit (lib) concatLines fixedWidthString fold isList max removeSuffix splitString throwIfNot toHexString;
inherit (lib.strings) replicate;
inherit (import <nix-math> { inherit lib; }) cos pi polynomial pow sin;
# Taylor series approximation of pow(x, 1/2.4) pending NixOS/nix#10387
pow124 = x: polynomial (x - 1) [
( 1.000000000) 0.416667000 (-0.121528000) 0.064139700 (-0.041423500) 0.029686900
(-0.022677500) 0.018088000 (-0.014884900) 0.012541900 (-0.010765100) 0.009378720
(-0.008271510) 0.007370120 (-0.006624340) 0.005998710 (-0.005467570) 0.005011940
(-0.004617480) 0.004273200 (-0.003970510) 0.003702660 (-0.003464230) 0.003250850
(-0.003058960) 0.002885620 (-0.002728390) 0.002585240 (-0.002454440) 0.002334530
(-0.002224290) 0.002122650 (-0.002028670) 0.001941580 (-0.001860690) 0.001785370
(-0.001715110) 0.001649450 (-0.001587950) 0.001530270 (-0.001476070) 0.001425070
(-0.001377000) 0.001331640 (-0.001288760) 0.001248190 (-0.001209750) 0.001173290
(-0.001138660) 0.001105740 (-0.001074410) 0.001044560 (-0.001016110) 0.000988945
(-0.000963001) 0.000938196 (-0.000914462) 0.000891734 (-0.000869953) 0.000849064
(-0.000829017) 0.000809764 (-0.000791261) 0.000773468 (-0.000756347) 0.000739863
(-0.000723982) 0.000708674 (-0.000693910) 0.000679663 (-0.000665908) 0.000652621
(-0.000639780) 0.000627364 (-0.000615354) 0.000603730 (-0.000592477) 0.000581576
(-0.000571013) 0.000560774 (-0.000550843) 0.000541209 (-0.000531859) 0.000522781
(-0.000513964) 0.000505398 (-0.000497073) 0.000488979 (-0.000481107) 0.000473449
(-0.000465997) 0.000458742 (-0.000451678) 0.000444798 (-0.000438094) 0.000431561
(-0.000425193) 0.000418983 (-0.000412926) 0.000407017 (-0.000401251) 0.000395623
(-0.000390128) 0.000384762 (-0.000379521) 0.000374401 (-0.000369397) 0.000364506
(-0.000359725) 0.000355050 (-0.000350477) 0.000346004 (-0.000341627) 0.000337344
(-0.000333152) 0.000329048 (-0.000325030) 0.000321094 (-0.000317239) 0.000313462
(-0.000309762) 0.000306135 (-0.000302580) 0.000299095 (-0.000295678) 0.000292327
(-0.000289040) 0.000285816 (-0.000282653) 0.000279549 (-0.000276503) 0.000273512
(-0.000270577) 0.000267695 (-0.000264865) 0.000262085 (-0.000259355) 0.000256673
(-0.000254038) 0.000251449 (-0.000248905) 0.000246404 (-0.000243946) 0.000241529
(-0.000239153) 0.000236816 (-0.000234518) 0.000232258 (-0.000230035) 0.000227848
(-0.000225696) 0.000223579 (-0.000221495) 0.000219444 (-0.000217425) 0.000215438
(-0.000213482) 0.000211555 (-0.000209659) 0.000207790 (-0.000205951) 0.000204138
(-0.000202353) 0.000200595 (-0.000198862) 0.000197154 (-0.000195472) 0.000193814
];
in
rec {
frame = color: text:
@ -19,7 +52,34 @@ rec {
(color "└───${pad "─" ""}───┘")
]);
oklchToRgb = { l, c, h }:
let
# Adapted from https://drafts.csswg.org/css-color-4/#color-conversion-code
a = c * cos (h * pi / 180);
b = c * sin (h * pi / 180);
# Adapted from https://bottosson.github.io/posts/oklab/#converting-from-linear-srgb-to-oklab
long = pow (l + 0.3963377774 * a + 0.2158037573 * b) 3;
medium = pow (l - 0.1055613458 * a - 0.0638541728 * b) 3;
short = pow (l - 0.0894841775 * a - 1.2914855480 * b) 3;
linear = {
r = 4.0767416621 * long - 3.3077115913 * medium + 0.2309699292 * short;
g = -1.2684380046 * long + 2.6097574011 * medium - 0.3413193965 * short;
b = -0.0041960863 * long - 0.7034186147 * medium + 1.7076147010 * short;
};
oetf = l':
throwIfNot (0 <= l' && l' <= 1) "oklch(${toString l} ${toString c} ${toString h}) is not representable in sRGB"
(if l' > 0.0031308 then 1.055 * (pow124 l') - 0.055 else 12.92 * l');
in
mapAttrs (_: oetf) linear;
printableLength = text: fold add 0 (map (v: if isList v then 0 else stringLength v) (split "\\[[^m]*m" text));
printablePad = width: placeholder: text: text + replicate (width - printableLength text) placeholder;
rgbToHex = { r, g, b }:
let f = x: fixedWidthString 2 "0" (toHexString (round (x * 255)));
in "#${f r}${f g}${f b}";
round = x: floor (x + 0.5);
}