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wip: theme update & some cleanup

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This commit is contained in:
Ashley Wulber 2023-08-03 15:03:23 -04:00 • committed by Ashley Wulber
parent 54d47a1b38
commit 620c1adb74
17 changed files with 181 additions and 905 deletions
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26
cosmic-theme/src/util.rs
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@ -31,29 +31,3 @@ impl Into<Srgba> for CssColor {
)
}
}
/// straight alpha "A over B" operator on non-linear srgba
pub fn over<A: Into<Srgba>, B: Into<Srgba>>(a: A, b: B) -> Srgba {
let a = a.into();
let b = b.into();
let o_a = (alpha_over(a.alpha, b.alpha)).max(0.0).min(1.0);
let o_r = (c_over(a.red, b.red, a.alpha, b.alpha, o_a))
.max(0.0)
.min(1.0);
let o_g = (c_over(a.green, b.green, a.alpha, b.alpha, o_a))
.max(0.0)
.min(1.0);
let o_b = (c_over(a.blue, b.blue, a.alpha, b.alpha, o_a))
.max(0.0)
.min(1.0);
Srgba::new(o_r, o_g, o_b, o_a)
}
fn alpha_over(a: f32, b: f32) -> f32 {
a + b * (1.0 - a)
}
fn c_over(a: f32, b: f32, a_alpha: f32, b_alpha: f32, o_alpha: f32) -> f32 {
a * a_alpha + b * b_alpha * (1.0 - a_alpha) / o_alpha
}