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M13.6: panel polish (log-density scopes, narrow-panel layouts) and an offscreen panels snapshot test

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas
2026-10-03 03:21:30 -04:00
co-authored by Claude Opus 5.5
parent b29d833b2d
commit e362cae4c7
5 changed files with 57 additions and 10 deletions
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crates/raster/src/scopes.rs
+6 -3
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@@ -5,7 +5,8 @@
//! ITU-R BT.601 / BT.709 / BT.2020 coefficients, colour differences `Cb = (B − Y) / (2(1 − Kb))`
//! and `Cr = (R − Y) / (2(1 − Kr))` (each in −0.5…0.5). Values are read straight (un-premultiplied)
//! from the frame. Every scope is a [`Scope`]: a `width × height` grid of three density planes
//! (one per trace colour) normalised so the busiest cell is 1, ready to be tinted and drawn.
//! (one per trace colour) on a logarithmic scale where the busiest cell is 1, ready to be tinted
//! and drawn.
//!
//! Scales: **8-bit** maps 0…1 to the plot (0…255 graticule); **float** maps −0.25…1.25 so
//! super-white and sub-black values stay visible. **Clamp** limits the signal to 0…1 first.
@@ -178,10 +179,12 @@ impl Scope {
self
}
fn normalise(&mut self) {
// Square-root density so faint traces stay visible next to dense ones.
// Logarithmic density (like a phosphor trace) so faint traces stay visible next to
// dense ones.
let max = self.counts.iter().flat_map(|p| p.iter()).copied().max().unwrap_or(0).max(1) as f32;
let k = 1.0 / (1.0 + max).ln();
for c in 0..3 {
self.planes[c] = self.counts[c].iter().map(|&n| (n as f32 / max).sqrt()).collect();
self.planes[c] = self.counts[c].iter().map(|&n| if n == 0 { 0.0 } else { (0.25 + 0.75 * (1.0 + n as f32).ln() * k).min(1.0) }).collect();
}
}
/// Total count of plane `c`.