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internal/f32color: delete unused NRGBAToRGBA_PostAlpha

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-04-21 17:17:39 +02:00
parent 354f5b43d2
commit 2296c80d28
2 changed files with 0 additions and 33 deletions
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internal/f32color/rgba.go
-18
View File
@@ -93,24 +93,6 @@ func NRGBAToLinearRGBA(col color.NRGBA) color.RGBA {
}
}
// NRGBAToRGBA_PostAlpha converts from non-premultiplied sRGB color to premultiplied sRGB color.
//
// Each component in the result is `sRGBToLinear(c) * alpha`, where `c`
// is the linear color.
func NRGBAToRGBA_PostAlpha(col color.NRGBA) color.RGBA {
if col.A == 0xFF {
return color.RGBA(col)
} else if col.A == 0x00 {
return color.RGBA{}
}
return color.RGBA{
R: uint8(uint32(col.R) * uint32(col.A) / 0xFF),
G: uint8(uint32(col.G) * uint32(col.A) / 0xFF),
B: uint8(uint32(col.B) * uint32(col.A) / 0xFF),
A: col.A,
}
}
// RGBAToNRGBA converts from premultiplied sRGB color to non-premultiplied sRGB color.
func RGBAToNRGBA(col color.RGBA) color.NRGBA {
if col.A == 0xFF {
internal/f32color/rgba_test.go
-15
View File
@@ -7,21 +7,6 @@ import (
"testing"
)
func TestNRGBAToRGBA_PostAlpha_Boundary(t *testing.T) {
for col := 0; col <= 0xFF; col++ {
for alpha := 0; alpha <= 0xFF; alpha++ {
in := color.NRGBA{R: uint8(col), A: uint8(alpha)}
premul := NRGBAToRGBA_PostAlpha(in)
if premul.A != uint8(alpha) {
t.Errorf("%v: got %v expected %v", in, premul.A, alpha)
}
if premul.R > premul.A {
t.Errorf("%v: R=%v > A=%v", in, premul.R, premul.A)
}
}
}
}
func TestNRGBAToLinearRGBA_Boundary(t *testing.T) {
for col := 0; col <= 0xFF; col++ {
for alpha := 0; alpha <= 0xFF; alpha++ {