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perf(display): skip preview work nobody reads (lazy checksum, 1 Hz snapshot writer) (#717)

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Mid-scroll, update_display() no longer checksums every frame: it asks is_currently_scrolling() once per frame and reuses the answer, hashes only when dirty tracking can skip a static frame, and the preview snapshot asks its policy first and hashes only when a write or touch could follow (decide() is monotone, pinned by a property test). With the preview open the snapshot is written at most once a second (VIEWER_INTERVAL 1.0 s, was 0.2 s; the SSE stream re-read it once a second, so four encodes in five went unread); the stream now polls its mtime every 0.25 s (VIEWER_POLL_INTERVAL), so the preview stays about as fresh. The PNG is written at compress_level=1. --preview soaks are not comparable across this change.

Merged with #716: _scan_segments takes the frame's one scrolling answer and #716's static-handover pass-through, as soaked on ledpi (A B B A, 20 min each: main 0.118% / 0.113% late, with #716 and this 0.107% / 0.104%).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-01 20:27:20 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 1ecf3aba03
commit f72d69c2b0
13 changed files with 804 additions and 47 deletions
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src/common/README.md
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@@ -231,7 +231,8 @@ rather than the `set_*` methods. Vegas mode reads a plugin's
[`snapshot_policy.py`](snapshot_policy.py). Core-internal. `decide()`
tells `DisplayManager` whether to write `/tmp/led_matrix_preview.png`, only
touch its mtime, or skip, based on whether a browser is watching the preview.
The web health check reads the file's age.
The web health check reads the file's age, and the web preview stream checks
its mtime every `VIEWER_POLL_INTERVAL`.
### sports_card