forked from mirrors/gotosocial
98263a7de6
* start fixing up tests * fix up tests + automate with drone * fiddle with linting * messing about with drone.yml * some more fiddling * hmmm * add cache * add vendor directory * verbose * ci updates * update some little things * update sig
23 lines
480 B
Go
23 lines
480 B
Go
package blurhash
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import "math"
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func linearTosRGB(value float64) int {
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v := math.Max(0, math.Min(1, value))
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if v <= 0.0031308 {
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return int(v*12.92*255 + 0.5)
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}
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return int((1.055*math.Pow(v, 1/2.4)-0.055)*255 + 0.5)
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}
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func sRGBToLinear(value int) float64 {
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v := float64(value) / 255
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if v <= 0.04045 {
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return v / 12.92
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}
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return math.Pow((v+0.055)/1.055, 2.4)
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}
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func signPow(value, exp float64) float64 {
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return math.Copysign(math.Pow(math.Abs(value), exp), value)
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}
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