1 files changed, 23 insertions, 0 deletions
diff --git a/vendor/github.com/buckket/go-blurhash/utils.go b/vendor/github.com/buckket/go-blurhash/utils.go
new file mode 100644
index 000000000..593ab61d5
--- /dev/null
+++ b/vendor/github.com/buckket/go-blurhash/utils.go
@@ -0,0 +1,23 @@
+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)
+}