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feat(display): compensate for the panel's scan order while scrolling (#634)

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A 1:N-scan HUB75 panel lights the two rows either side of its middle at opposite ends of each refresh, so a scroll at one pixel per refresh shows a 1px step across the middle of every panel. While something scrolls at one frame per refresh, DisplayManager now shows the half whose seam row lights first one refresh behind the other (src/scan_order.py), which lines the two up again. Only for layouts whose row order is known; display.scan_order_compensation "off" disables it. Confirmed on hdpi before and after.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chuck
2026-09-24 19:47:44 -04:00
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co-authored by Claude Opus 5.5
parent 8ad9d191a7
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CHANGELOG.md
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@@ -266,6 +266,12 @@ floor on the release that ships them):
stall watchdog logs the stack of whatever holds a scroll up for 250 ms or
more. See `docs/SCROLL_PERFORMANCE.md`, "Soaking a rig".
- `display.scan_order_compensation` (`"auto"` by default): while something
scrolls at one pixel per refresh, one half of each panel is shown a refresh
behind the other, which removes the 1px step a 1:N-scan panel shows across
its middle. Only for layouts whose row order is known; `"off"` disables it.
See `docs/SCROLL_PERFORMANCE.md`, "A tear across the middle on fast scrolls".
## 3.5.0
New modules a plugin may import via `src.*` (floor on 3.5.0):