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software: improve alpha blending for draw_line

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This commit is contained in:
Wez Furlong 2019-09-30 08:17:47 -07:00
parent b5e07005b7
commit b2212c3105
1 changed files with 3 additions and 4 deletions
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7
window/src/bitmaps/mod.rs
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@ -1,6 +1,6 @@
use crate::color::Color;
use crate::{Operator, Point, Rect, Size};
use palette::Srgba;
use palette::LinSrgba;
use std::cell::RefCell;
pub mod atlas;
@ -221,8 +221,7 @@ pub trait BitmapImage {
/// specified Operator.
fn draw_line(&mut self, start: Point, end: Point, color: Color, operator: Operator) {
let (dim_width, dim_height) = self.image_dimensions();
let srgba: Srgba = color.into();
let linear = srgba.into_linear();
let linear: LinSrgba = color.into();
let (red, green, blue, alpha) = linear.into_components();
for ((x, y), value) in line_drawing::XiaolinWu::<f32, isize>::new(
@ -237,7 +236,7 @@ pub trait BitmapImage {
}
let pix = self.pixel_mut(x as usize, y as usize);
let color: Color = Srgba::from_components((red, green, blue, alpha * value)).into();
let color: Color = LinSrgba::from_components((red, green, blue, alpha * value)).into();
*pix = color.composite(Color(*pix), &operator).0;
}
}