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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/CONFIG_REFERENCE.md
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@@ -127,7 +127,8 @@ Read by `src/vegas_mode/config.py` (`VegasScrollConfig.from_config`). See
| `min_content_separation` | int, `24` |
| `min_cut_gap` | int, `6` |
| `continuous_scroll` | bool, `true` |
| `smooth_scroll` | bool, `true` |
| `smooth_scroll` | bool, `true` — move a whole number of pixels per panel refresh, locked to vsync. `scroll_speed` is snapped to the nearest speed the panel can show that way (at 95Hz: 95, 47.5, 31.7 px/s…), measured against the panel's real refresh rate once scrolling starts |
| `sub_pixel_blend` | bool, `false` — the older smoothing: advance by elapsed time and blend neighbouring pixel columns. Looks anti-aliased in the web preview but shimmers on the panel and is not locked to the refresh. Overrides `smooth_scroll` when on |
| `extend_threshold_screens` | float, `2.0` |
| `auto_trim` | bool, `true` |
| `trim_threshold` | int, `10` |