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lib: fix rgba (inject lib)

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This commit is contained in:
Anthony Rodriguez 2024-11-22 19:36:29 +01:00
parent bdc95279e2
commit f0fd043ec3
Signed by: nezia
GPG key ID: EE3BE97C040A86CE
1 changed files with 15 additions and 12 deletions
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27
lib/default.nix
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@ -1,13 +1,13 @@
let
# convert rrggbb hex to rgba(r, g, b, a)
rgba = c: let
r = toString (hexToDec (builtins.substring 0 2 c));
g = toString (hexToDec (builtins.substring 2 2 c));
b = toString (hexToDec (builtins.substring 4 2 c));
in "rgba(${r}, ${g}, ${b}, .5)";
rgba = lib: color: opacity: let
r = toString (hexToDec lib (builtins.substring 0 2 color));
g = toString (hexToDec lib (builtins.substring 2 2 color));
b = toString (hexToDec lib (builtins.substring 4 2 color));
in "rgba(${r}, ${g}, ${b}, ${opacity})";
# Helper function to convert hex color to decimal RGB values
hexToDec = lib: v: let
# Map of hex characters to their decimal values
hexToInt = {
"0" = 0;
"1" = 1;
@ -32,13 +32,16 @@ let
"E" = 14;
"F" = 15;
};
chars = lib.strings.stringToCharacters v;
# Remove any leading `#` from the input
cleanHex =
if lib.strings.substring 0 1 v == "#"
then lib.strings.substring 1 (builtins.stringLength v - 1) v
else v;
# Convert the cleaned string into characters
chars = lib.strings.stringToCharacters cleanHex;
in
lib.foldl' (a: v: a + v) 0
(lib.imap (k: v: hexToInt."${v}" * (pow 16 (builtins.length chars - k - 1))) chars);
# Power function for exponentiation
pow = lib: base: exponent: lib.foldl' (acc: _: acc * base) 1 (lib.range 1 exponent);
# Fold over the characters to calculate the decimal value
builtins.foldl' (acc: char: acc * 16 + hexToInt."${char}") 0 chars;
blurImage = pkgs: path:
pkgs.runCommand "${builtins.baseNameOf path}-blurred" {