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fix(vegas): smooth Vegas scroll pacing -- whole pixels per refresh, measured refresh, off-thread preview writes (#628)

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Vegas scrolls a whole number of pixels per panel refresh, locked to SwapOnVSync, against the refresh the panel really holds (measured from swap gaps), instead of blending sub-pixel positions against the refresh cap. The web preview PNG is encoded off the render thread while scrolling, with writes ordered and retried. On hdpi, late frames fell from 6.3% to 0.7%. See docs/SCROLL_PERFORMANCE.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chuck
2026-09-24 19:38:22 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent b9416ef803
commit 7f9c73e9aa
12 changed files with 632 additions and 71 deletions
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docs/SCROLL_PERFORMANCE.md
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@@ -207,7 +207,10 @@ Fixed by rebuilding the binding: `scripts/build_rgbmatrix_nogil.sh`.
### 3. Sub-pixel blending was wrong for this display
Enabling it made things worse, not better — see the rule at the top. It is off
by default and only Vegas mode opts in via `set_sub_pixel_scrolling(True)`.
by default everywhere. Vegas mode used to opt in; it now scrolls in whole
pixels locked to the refresh like the plugin tickers, and keeps the blend only
behind `display.vegas_scroll.sub_pixel_blend` (default `false`). The blend is
also why text looked anti-aliased in the web preview while the panel shimmered.
### 4. Frame-based stepping raced the vsync clock