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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>
This commit is contained in:
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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test/test_vegas_density.py
+4
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@@ -837,6 +837,10 @@ class TestCycleEndsBeforeWrap:
return p
def _advance_to(self, pipeline, distance):
# render_frame() steps before it checks, and a whole-pixel pace steps
# a fixed amount; start one step short so the checked frame is at
# `distance`.
distance -= pipeline.scroll_helper.fixed_pixels_per_frame or 0
pipeline.scroll_helper.total_distance_scrolled = distance
pipeline.scroll_helper.scroll_position = float(distance)