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add increase_brightness

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Ashley 2022-11-24 20:14:36 +00:00
parent cca7975190
commit e19d4d34ca
1 changed files with 19 additions and 0 deletions
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19
src/libpoketube/ptutils/libpt-coreutils.js
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@ -72,6 +72,25 @@ function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function increase_brightness(hex, percent){
// strip the leading # if it's there
hex = hex.replace(/^\s*#|\s*$/g, '');
// convert 3 char codes --> 6, e.g. `E0F` --> `EE00FF`
if(hex.length == 3){
hex = hex.replace(/(.)/g, '$1$1');
}
var r = parseInt(hex.substr(0, 2), 16),
g = parseInt(hex.substr(2, 2), 16),
b = parseInt(hex.substr(4, 2), 16);
return '#' +
((0|(1<<8) + r + (256 - r) * percent / 100).toString(16)).substr(1) +
((0|(1<<8) + g + (256 - g) * percent / 100).toString(16)).substr(1) +
((0|(1<<8) + b + (256 - b) * percent / 100).toString(16)).substr(1);
}
module.exports = {
IsJsonString,
convert,