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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_display_pending_changes.py
+3
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@@ -140,6 +140,9 @@ def vegas_coordinator(controller):
'enabled': True, 'max_cycle_duration': VEGAS_ITERATION_SECONDS}}})
assert coord.vegas_config.continuous_scroll
coord.render_pipeline = MagicMock()
# Real numbers: the loop sleeps and reports against these.
coord.render_pipeline.frame_interval = coord.vegas_config.get_frame_interval()
coord.render_pipeline.target_fps = float(coord.vegas_config.target_fps)
coord.stream_manager = MagicMock()
coord.display_manager = controller.display_manager
coord.stats = {'cycles_completed': 0, 'interruptions': 0}