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perf(sports): reuse an unchanged scroll strip at the start of a turn (#719)

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A scoreboard in scroll mode no longer redraws every card at the start of a recent/upcoming turn whose games have not changed (~1.4 s for seven football cards at 192x48 on a Pi 4, with the render thread waiting). SportsScrollDisplayManager keeps one display per slate (game type + leagues; up to 4 per game type, at most 6 MB per plugin of strips not on screen) and rewinds the strip it built last time when its games, rankings, config, panel size and date are unchanged and it is under 10 minutes old. First turns, changed slates, live strips and empty turns are drawn as before; get_scroll_display() still answers with the strip on screen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chuck
2026-10-01 20:39:44 -04:00
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co-authored by Claude Opus 5.5
parent 746dcfcadb
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CHANGELOG.md
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@@ -185,6 +185,24 @@ policies are unchanged.
until the next minute, because the once-a-minute schedule check had
already run that minute and the session had overridden its answer.
### Scrolling
- A scoreboard in scroll mode no longer freezes the panel at the start of a
recent or upcoming turn whose games have not changed.
`SportsScrollDisplayManager.prepare_and_display()` redrew every card on
every turn while the render thread waited (~1.4s for seven football cards
at 192x48 on a Pi 4); it now rewinds the strip it built last time when
nothing it is drawn from has changed (the games, rankings, config, panel
size and date), and redraws it at least every 10 minutes. Each slate (game
type and leagues) keeps its own display, so leagues that take turns
(`nfl_recent`, `ncaa_fb_recent`) each find their strip again: up to 4 per
game type, with at most 6MB per plugin of strips kept for slates not on
screen. The first turn of each slate after a start, a slate whose games
changed, live strips and a turn with no games are drawn as before.
`get_scroll_display()` and `_scroll_displays` still answer with the strip
on screen; a sport's `prepare_scroll_content()` is no longer called on
every turn.
### Web preview: less work per frame
- Mid-scroll, `update_display()` no longer checksums every frame. The