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feat(vegas): live elements update in place while they scroll

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One background worker (src/vegas_mode/live_worker.py) redraws a plugin's
live elements when its data epoch moves on (update listener) or on their
refresh_hz, nearest the screen first, and hands changed pixels lock-free to
the render thread, which copies them into the strip between frames
(RenderPipeline.apply_live_patches, ScrollHelper.patch_columns): at most
four patches or two screens of bytes a frame, no drawing or locks there.
The worker takes over group prefetch once a live element is placed, runs
inside the render gate, and is supervised. Update tick 1s while live
elements exist. Web UI switch for live_refresh. OFFSCREEN_RENDERING.md
describes what was built and why SegmentStrip was not needed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-09-30 18:36:39 -04:00
co-authored by Claude Opus 5.5
parent 701c220ad0
commit 876130e93f
23 changed files with 2540 additions and 240 deletions
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mypy-clean.txt
+4
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@@ -72,13 +72,17 @@ src/plugin_system/testing/loading.py
src/plugin_system/testing/mocks.py
src/plugin_system/testing/plugin_test_base.py
src/plugin_system/testing/sizes.py
src/plugin_system/testing/vegas.py
src/plugin_system/vegas_elements.py
src/redaction.py
src/scan_order.py
src/startup_validator.py
src/vegas_mode/__init__.py
src/vegas_mode/config.py
src/vegas_mode/coordinator.py
src/vegas_mode/elements.py
src/vegas_mode/geometry.py
src/vegas_mode/live_worker.py
src/vegas_mode/stream_manager.py
src/web_interface/api_helpers.py
src/web_interface/config_arrays.py