misskey/src/client/scripts/extract-avg-color-from-blur...

10 lines
330 B
TypeScript

export function extractAvgColorFromBlurhash(hash: string) {
return typeof hash == 'string'
? '#' + [...hash.slice(2, 6)]
.map(x => '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#$%*+,-.:;=?@[]^_{|}~'.indexOf(x))
.reduce((a, c) => a * 83 + c, 0)
.toString(16)
.padStart(6, '0')
: undefined;
}