Poster IDs
Boards such as /pol/ and /bant/ support unique poster IDs that let you recognize the individual behind posts throughout a thread.
These IDs are displayed with colors on 4chan but colorless on FoolFuuka. We've been able to locate the code computing the color within 4chan's JS extension and offer a simplified Golang version below:
func IDStyle(s string) string {
//Initially equals 0
var hash int64
//Iterate over bytes in the string
for _, r := range []byte(s) {
hash = ((hash << 5) - hash) + int64(r)
}
red := (hash >> 24) & 0xFF
green := (hash >> 16) & 0xFF
blue := (hash >> 8) & 0xFF
result := fmt.Sprintf("background-color: rgb(%d, %d, %d);", red, green, blue)
//Determines how light the color just computed is
light := float64(red)*0.299+float64(green)*0.587+float64(blue)*0.114 > 125
if light {
result += "color: black;"
} else {
result += "color: white;"
}
//e.g. "background-color: rbg(10, 20, 30); color: white"
return result
}
