mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-21 00:21:59 +03:00
24 lines
480 B
Go
24 lines
480 B
Go
|
package blurhash
|
||
|
|
|
||
|
|
import "math"
|
||
|
|
|
||
|
|
func linearTosRGB(value float64) int {
|
||
|
|
v := math.Max(0, math.Min(1, value))
|
||
|
|
if v <= 0.0031308 {
|
||
|
|
return int(v*12.92*255 + 0.5)
|
||
|
|
}
|
||
|
|
return int((1.055*math.Pow(v, 1/2.4)-0.055)*255 + 0.5)
|
||
|
|
}
|
||
|
|
|
||
|
|
func sRGBToLinear(value int) float64 {
|
||
|
|
v := float64(value) / 255
|
||
|
|
if v <= 0.04045 {
|
||
|
|
return v / 12.92
|
||
|
|
}
|
||
|
|
return math.Pow((v+0.055)/1.055, 2.4)
|
||
|
|
}
|
||
|
|
|
||
|
|
func signPow(value, exp float64) float64 {
|
||
|
|
return math.Copysign(math.Pow(math.Abs(value), exp), value)
|
||
|
|
}
|