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Improve /image bright mode

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This commit is contained in:
Joscha 2025-03-01 22:30:52 +01:00
parent fbab0b9441
commit 2451bb3d76
1 changed files with 7 additions and 17 deletions
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24
showbits-typst-plugin/src/lib.rs
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@ -1,27 +1,15 @@
use std::io::Cursor;
use image::{
ImageFormat,
ImageFormat, Luma, Pixel,
imageops::{self, FilterType},
};
use mark::dither::{AlgoFloydSteinberg, AlgoStucki, Algorithm, DiffEuclid, Palette};
use palette::{FromColor, IntoColor, LinLumaa, LinSrgb, Srgba};
use palette::LinSrgb;
use wasm_minimal_protocol::{initiate_protocol, wasm_func};
initiate_protocol!();
// Palette <-> image color conversions
fn image_to_palette(color: image::Rgba<u8>) -> Srgba {
let [r, g, b, a] = color.0;
Srgba::new(r, g, b, a).into_format()
}
fn palette_to_image(color: Srgba) -> image::Rgba<u8> {
let color = color.into_format::<u8, u8>();
image::Rgba([color.red, color.green, color.blue, color.alpha])
}
// Typst type conversions
fn i64_from_bytes(bytes: &[u8]) -> Result<i64, String> {
@ -88,9 +76,11 @@ pub fn dither(
if bright {
for pixel in image.pixels_mut() {
let mut color = LinLumaa::from_color(image_to_palette(*pixel));
color.luma = 1.0 - 0.4 * (1.0 - color.luma);
*pixel = palette_to_image(color.into_color());
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();
}
}