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Add Color32::lerp_to_gamma (#4627)

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Add `lerp_to_gamma` utility function to `Color32`

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
Antoine Beyeler
2024-06-06 15:41:10 +02:00
committed by GitHub
parent 1f008fb730
commit 2545939c15
4 changed files with 19 additions and 11 deletions
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16
crates/ecolor/src/color32.rs
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@@ -1,4 +1,6 @@
use crate::{gamma_u8_from_linear_f32, linear_f32_from_gamma_u8, linear_f32_from_linear_u8, Rgba};
use crate::{
fast_round, gamma_u8_from_linear_f32, linear_f32_from_gamma_u8, linear_f32_from_linear_u8, Rgba,
};
/// This format is used for space-efficient color representation (32 bits).
///
@@ -235,4 +237,16 @@ impl Color32 {
a as f32 / 255.0,
]
}
/// Lerp this color towards `other` by `t` in gamma space.
pub fn lerp_to_gamma(&self, other: Self, t: f32) -> Self {
use emath::lerp;
Self::from_rgba_premultiplied(
fast_round(lerp((self[0] as f32)..=(other[0] as f32), t)),
fast_round(lerp((self[1] as f32)..=(other[1] as f32), t)),
fast_round(lerp((self[2] as f32)..=(other[2] as f32), t)),
fast_round(lerp((self[3] as f32)..=(other[3] as f32), t)),
)
}
}