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internal/f32color: add support for light widgets to Hovered

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
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Elias Naur
2022-02-28 13:20:33 +01:00
parent b74c9f9603
commit 2bea9a3736
1 changed files with 8 additions and 4 deletions
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internal/f32color/rgba.go
+8 -4
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@@ -151,11 +151,15 @@ func Disabled(c color.NRGBA) (d color.NRGBA) {
return
}
// Hovered blends color towards a brighter color. It is approximate
// because it operates in non-linear sRGB space.
// Hovered blends dark colors towards white, and light colors towards
// black. It is approximate because it operates in non-linear sRGB space.
func Hovered(c color.NRGBA) (h color.NRGBA) {
const r = 0x20 // lighten ratio
return mix(color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: c.A}, c, r)
const ratio = 0x20
m := color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: c.A}
if approxLuminance(c) > 128 {
m = color.NRGBA{A: c.A}
}
return mix(m, c, ratio)
}
// mix mixes c1 and c2 weighted by (1 - a/256) and a/256 respectively.