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lib8: fix hsv2rgb implementation by prescaling the hue

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This commit is contained in:
Victoria Fischer 2024-11-24 18:54:25 +01:00
parent be8aa0248d
commit 859177a65c
1 changed files with 13 additions and 6 deletions
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19
src/lib8/mod.rs
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@ -6,6 +6,8 @@ use palette::encoding::srgb::Srgb;
use rgb::Rgb;
use crate::lib8::interpolate::scale8;
pub trait Rgb8Blend {
fn saturating_add<T: Into<Self>>(self, b: T) -> Self where Self: Sized;
}
@ -32,23 +34,28 @@ impl IntoRgb8 for palette::Hsv<Srgb, u8> {
fn into_rgb8(self) -> Rgb<u8> {
const HSV_SECTION_3: u8 = 0x40;
if self.saturation == 0 {
return Rgb::new(self.value, self.value, self.value)
}
let mock_hue = scale8(191, self.hue.into_inner());
let value: u8 = self.value;
let saturation: u8 = self.saturation;
let invsat: u8 = 255 - saturation;
let brightness_floor: u8 = (value as u16 * invsat as u16 / 256) as u8;
let color_amplitude: u8 = value - brightness_floor;
let section: u8 = self.hue.into_inner() / HSV_SECTION_3;
let offset: u8 = self.hue.into_inner() % HSV_SECTION_3;
let section: u8 = mock_hue / HSV_SECTION_3;
let offset: u8 = mock_hue % HSV_SECTION_3;
let rampup: u8 = offset;
let rampdown: u8 = (HSV_SECTION_3 - 1) - offset;
let rampup_amp_adj: u8 = (rampup as u16 * color_amplitude as u16 / (256 / 4)) as u8;
let rampdown_amp_adj: u8 = (rampdown as u16 * color_amplitude as u16 / (256 / 4)) as u8;
let rampup_amp_adj: u8 = (rampup as u16 * color_amplitude as u16 / 64) as u8;
let rampdown_amp_adj: u8 = (rampdown as u16 * color_amplitude as u16 / 64) as u8;
let rampup_adj_with_floor: u8 = rampup_amp_adj + brightness_floor;
let rampdown_adj_with_floor: u8 = rampdown_amp_adj + brightness_floor;
let rampup_adj_with_floor: u8 = rampup_amp_adj.saturating_add(brightness_floor);
let rampdown_adj_with_floor: u8 = rampdown_amp_adj.saturating_add(brightness_floor);
match section {
1 => Rgb::new(brightness_floor, rampdown_adj_with_floor, rampup_adj_with_floor),