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feat(vegas): render every plugin's ticker content off the render thread

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The plugin-facing canvas (DisplayManager.image, draw, matrix) was one
shared object, so any plugin whose Vegas content needed it -- display
capture, scroll-content generation, narrowed rendering -- was deferred to
the render thread and fetched there one at a time. On hdpi that is most
plugins, and each fetch stalled the scroll: news ~320ms, hockey ~660ms,
in bursts whenever the strip extended.

DisplayManager.offscreen() gives the calling thread a canvas of its own.
image, draw and matrix are now properties that resolve to the thread's
surface while it is inside the block and to the shared canvas otherwise,
so the ~100 existing uses become thread-correct unchanged. Inside,
update_display(), the hardware half of clear(), and set_scrolling_state()/
set_frame_hold() are inert, so a plugin drawn for Vegas can neither reach
the panel nor re-pace the live scroll. render_size() is rebuilt on it.
capture_mode() now restores the previous state instead of clearing it,
so it cannot end suppression inside an offscreen block.

The adapter draws every path on its own canvas (_isolated_canvas) and
drops the copy-and-restore of the shared image, which from a background
thread would have written a stale frame back over the render loop's.
Background fetches take the plugin's update/display lock, waiting up to
2s for a running update() and skipping the plugin that round otherwise;
Vegas never took that lock, so render-thread captures already raced
update(). A background fetch that comes back empty is no longer queued
for the render thread.

vegas_scroll.offscreen_prefetch (default true) restores the old deferred
path when false. See docs/OFFSCREEN_RENDERING.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-09-24 09:31:27 -04:00
co-authored by Claude Opus 5.5
parent 430e2312f8
commit 13b5264d11
9 changed files with 690 additions and 89 deletions
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docs/CONFIG_REFERENCE.md
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@@ -127,6 +127,7 @@ 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` |
| `offscreen_prefetch` | bool, `true` — render every plugin's ticker content on the background thread, each on its own canvas. `false` restores handing canvas-bound plugins to the render thread, one pause at a time. Temporary; see [OFFSCREEN_RENDERING.md](OFFSCREEN_RENDERING.md) |
| `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` |