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cmm: add support for compound_power_2_4

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This commit is contained in:
Julian Orth 2025-12-18 18:03:35 +01:00
parent 3e3cb3114c
commit b5c0e3a07e
11 changed files with 58 additions and 7 deletions
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16
src/theme.rs
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@ -108,6 +108,13 @@ impl Color {
fn gamma28(c: f32) -> f32 {
c.signum() * c.abs().powf(2.8)
}
fn compound_power_2_4(c: f32) -> f32 {
if c < 0.04045 {
c / 12.92
} else {
((c + 0.055) / 1.055).powf(2.4)
}
}
macro_rules! convert {
($tf:ident) => {{
r = $tf(r);
@ -135,6 +142,7 @@ impl Color {
let pow = |c: f32| -> f32 { c.signum() * c.abs().powf(e) };
convert!(pow)
}
Eotf::CompoundPower24 => convert!(compound_power_2_4),
}
Self { r, g, b, a: 1.0 }
}
@ -237,6 +245,13 @@ impl Color {
fn gamma28(c: f32) -> f32 {
c.signum() * c.abs().powf(1.0 / 2.8)
}
fn compound_power_2_4(c: f32) -> f32 {
if c < 0.0031308 {
12.92 * c
} else {
1.055 * c.powf(1.0 / 2.4) - 0.055
}
}
macro_rules! convert {
($tf:ident) => {{
for c in &mut res[..3] {
@ -270,6 +285,7 @@ impl Color {
let pow = |c: f32| -> f32 { c.signum() * c.abs().powf(e) };
convert!(pow)
}
Eotf::CompoundPower24 => convert!(compound_power_2_4),
}
if self.a < 1.0 {
for c in &mut res[..3] {