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M12: boards dot grid: blending a dot in a function of its own (Sonar)

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bflatastic
2026-10-24 14:19:14 +07:00
parent 99b45d8e52
commit f68f748418
1 changed files with 19 additions and 14 deletions
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crates/render/src/dots.rs
+19 -14
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@@ -62,20 +62,25 @@ pub(crate) fn draw(pix: &mut Pixmap, view: &View, d: &Dots) {
if xa >= xb {
continue;
}
let [r, g, b, a] = if i % 2 == 0 && j % 2 == 0 { strong } else { faded };
if a == 0 {
continue;
}
for y in ya..yb {
let start = y as usize * row;
let Some(line) = data.get_mut(start + xa as usize * 4..start + xb as usize * 4) else { continue };
for px in line.chunks_exact_mut(4) {
// Source over, premultiplied.
let keep = 255 - a;
for (dst, src) in px.iter_mut().zip([r, g, b, a]) {
*dst = (src + u32::from(*dst) * keep / 255).min(255) as u8;
}
}
let rgba = if i % 2 == 0 && j % 2 == 0 { strong } else { faded };
blend_square(data, row, (xa, xb), (ya, yb), rgba);
}
}
}
/// Blend premultiplied `rgba` source-over into the pixels `xs` × `ys` of `data`, rows `row` bytes
/// long.
fn blend_square(data: &mut [u8], row: usize, (xa, xb): (i64, i64), (ya, yb): (i64, i64), rgba: [u32; 4]) {
let keep = 255 - rgba[3];
if rgba[3] == 0 {
return;
}
for y in ya..yb {
let start = y as usize * row;
let Some(line) = data.get_mut(start + xa as usize * 4..start + xb as usize * 4) else { continue };
for px in line.chunks_exact_mut(4) {
for (dst, src) in px.iter_mut().zip(rgba) {
*dst = (src + u32::from(*dst) * keep / 255).min(255) as u8;
}
}
}