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This commit is contained in:
Joscha 2024-03-15 22:13:45 +01:00
parent e7d3d2b638
commit 9d4ecaaf72
2 changed files with 25 additions and 13 deletions
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16
showbits-common/src/widgets/image.rs
View file

@ -3,7 +3,7 @@ use image::{
RgbaImage,
};
use mark::dither::{AlgoFloydSteinberg, AlgoStucki, Algorithm, DiffEuclid, Palette};
use palette::{IntoColor, Srgb, Srgba};
use palette::{IntoColor, LinSrgb, Srgba};
use taffy::prelude::{AvailableSpace, Layout, Size};
use crate::Widget;
@ -15,12 +15,12 @@ pub enum DitherAlgorithm {
}
impl DitherAlgorithm {
fn dither(self, image: RgbaImage, palette: &Palette<Srgb>) -> RgbaImage {
fn dither(self, image: RgbaImage, palette: &Palette<LinSrgb>) -> RgbaImage {
match self {
Self::FloydSteinberg => {
<AlgoFloydSteinberg as Algorithm<Srgb, DiffEuclid>>::run(image, palette)
<AlgoFloydSteinberg as Algorithm<LinSrgb, DiffEuclid>>::run(image, palette)
}
Self::Stucki => <AlgoStucki as Algorithm<Srgb, DiffEuclid>>::run(image, palette),
Self::Stucki => <AlgoStucki as Algorithm<LinSrgb, DiffEuclid>>::run(image, palette),
}
}
}
@ -31,11 +31,7 @@ pub struct Image {
grow: bool,
filter: FilterType,
// The palette uses Srgb instead of LinSrgb because dithering in Srgb
// produces better results when printed, even though color distance
// calculations are objectively wrong. Maybe the printer's black ink
// behaviour makes them correct again.
dither_palette: Option<Palette<Srgb>>,
dither_palette: Option<Palette<LinSrgb>>,
dither_algorithm: DitherAlgorithm,
}
@ -70,7 +66,7 @@ impl Image {
let palette = palette
.iter()
.map(|c| c.color.into_color())
.collect::<Vec<Srgb>>();
.collect::<Vec<LinSrgb>>();
self.dither_palette = Some(Palette::new(palette));
self

22
showbits-thermal-printer/src/drawer.rs
View file

@ -1,6 +1,6 @@
mod calendar;
use image::RgbaImage;
use image::{Luma, Pixel, RgbaImage};
use showbits_common::{
color::{BLACK, WHITE},
widgets::{Block, FontStuff, HasFontStuff, Image, Text},
@ -131,9 +131,17 @@ impl Drawer {
Ok(())
}
fn on_image(&mut self, image: RgbaImage) -> anyhow::Result<()> {
fn on_image(&mut self, mut image: RgbaImage) -> anyhow::Result<()> {
let mut tree = Tree::<Context>::new(WHITE);
for pixel in image.pixels_mut() {
let [l] = pixel.to_luma().0;
let l = l as f32 / 255.0; // Convert to [0, 1]
let l = 1.0 - (0.4 * (1.0 - l)); // Lerp to [0.6, 1]
let l = (l.clamp(0.0, 1.0) * 255.0) as u8; // Convert back to [0, 255]
*pixel = Luma([l]).to_rgba();
}
let image = Image::new(image)
.with_dither_palette(&[BLACK, WHITE])
.node()
@ -152,9 +160,17 @@ impl Drawer {
Ok(())
}
fn on_photo(&mut self, image: RgbaImage, title: String) -> anyhow::Result<()> {
fn on_photo(&mut self, mut image: RgbaImage, title: String) -> anyhow::Result<()> {
let mut tree = Tree::<Context>::new(WHITE);
for pixel in image.pixels_mut() {
let [l] = pixel.to_luma().0;
let l = l as f32 / 255.0; // Convert to [0, 1]
let l = 1.0 - (0.4 * (1.0 - l)); // Lerp to [0.6, 1]
let l = (l.clamp(0.0, 1.0) * 255.0) as u8; // Convert back to [0, 255]
*pixel = Luma([l]).to_rgba();
}
let image = Image::new(image)
.with_dither_palette(&[BLACK, WHITE])
.node()