blob: a653f115540d07b0030c155238f90844ea1dfb26 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
{lib, ...}: let
colorToInt = hex: let
table = {
"0" = 0;
"1" = 1;
"2" = 2;
"3" = 3;
"4" = 4;
"5" = 5;
"6" = 6;
"7" = 7;
"8" = 8;
"9" = 9;
"a" = 10;
"b" = 11;
"c" = 12;
"d" = 13;
"e" = 14;
"f" = 15;
};
in
builtins.foldl'
(acc: c: acc * 16 + table.${c})
0
(lib.strings.stringToCharacters (lib.strings.toLower hex));
colorToHex = n: let
hexChars = "0123456789abcdef";
hi = builtins.div n 16;
lo = lib.trivial.mod n 16;
in
builtins.substring hi 1 hexChars
+ builtins.substring lo 1 hexChars;
mapColor = f: hex: let
r = colorToInt (builtins.substring 0 2 hex);
g = colorToInt (builtins.substring 2 2 hex);
b = colorToInt (builtins.substring 4 2 hex);
in
colorToHex (f r)
+ colorToHex (f g)
+ colorToHex (f b);
darkenColor = factor: hex:
mapColor (c: builtins.floor (c * (1 - factor))) hex;
lightenColor = factor: hex:
mapColor (c: builtins.floor (c + (255 - c) * factor)) hex;
mixColor = factor: hex1: hex2: let
r1 = colorToInt (builtins.substring 0 2 hex1);
g1 = colorToInt (builtins.substring 2 2 hex1);
b1 = colorToInt (builtins.substring 4 2 hex1);
r2 = colorToInt (builtins.substring 0 2 hex2);
g2 = colorToInt (builtins.substring 2 2 hex2);
b2 = colorToInt (builtins.substring 4 2 hex2);
r = builtins.floor (r1 * factor) + builtins.floor (r2 * (1 - factor));
g = builtins.floor (g1 * factor) + builtins.floor (g2 * (1 - factor));
b = builtins.floor (b1 * factor) + builtins.floor (b2 * (1 - factor));
in
colorToHex r
+ colorToHex g
+ colorToHex b;
in {
inherit colorToInt colorToHex darkenColor lightenColor mixColor;
}
|
