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internal/f32color: revert incorrect NRGBA to linear color change

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Egon Elbre convinced me commit 01d5e72291 was incorrect, because
in the NRGBA colorspace the alpha value is linear, not gamma adjusted.

Updates gio#192

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-01-16 09:58:04 +01:00
parent 01d5e72291
commit 99bfa6a33c
1 changed files with 6 additions and 6 deletions
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internal/f32color/rgba.go
+6 -6
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@@ -28,9 +28,9 @@ func (col RGBA) SRGB() color.NRGBA {
return color.NRGBA{} return color.NRGBA{}
} }
return color.NRGBA{ return color.NRGBA{
R: uint8(linearTosRGB(col.R)/col.A*255 + .5), R: uint8(linearTosRGB(col.R/col.A)*255 + .5),
G: uint8(linearTosRGB(col.G)/col.A*255 + .5), G: uint8(linearTosRGB(col.G/col.A)*255 + .5),
B: uint8(linearTosRGB(col.B)/col.A*255 + .5), B: uint8(linearTosRGB(col.B/col.A)*255 + .5),
A: uint8(col.A*255 + .5), A: uint8(col.A*255 + .5),
} }
} }
@@ -53,9 +53,9 @@ func (col RGBA) Opaque() RGBA {
func LinearFromSRGB(col color.NRGBA) RGBA { func LinearFromSRGB(col color.NRGBA) RGBA {
af := float32(col.A) / 0xFF af := float32(col.A) / 0xFF
return RGBA{ return RGBA{
R: sRGBToLinear(float32(col.R) / 0xff * af), R: sRGBToLinear(float32(col.R)/0xff) * af,
G: sRGBToLinear(float32(col.G) / 0xff * af), G: sRGBToLinear(float32(col.G)/0xff) * af,
B: sRGBToLinear(float32(col.B) / 0xff * af), B: sRGBToLinear(float32(col.B)/0xff) * af,
A: af, A: af,
} }
} }