controller: browser-rendered overlays — Grafana/chat/любой HTML
MVP Phase 8 feature: headless Chromium snapshot URL → PNG → existing icon
overlay infrastructure. Use case — Grafana dashboard, web chat, любой
HTML widget с transparent background поверх video composite.
Архитектура:
BrowserRenderer launches один shared Chromium instance, per-dashboard
page. Loop:
page.reload (для свежих данных — Grafana auto-refresh не triggers
в headless mode без user interaction)
page.add_style_tag (re-inject transparent CSS — reload teryает styles)
page.wait_for_selector (если selector задан)
page.screenshot(omit_background=True) или locator(selector).screenshot
save PNG к icon_dir
dispatcher._reload_icon → filter re-reads atlas
Config (dynamic_overlays.dashboards в controller.yaml):
id, target_instance, cell, url, x, y, w_px, h_px,
refresh_sec (default 2.0s, min 0.5s — frequent reload bad см. stutter memory),
inject_css (default — transparent background + zero margins),
selector (optional CSS selector — экспортить только конкретный element),
viewport_w/h (override page viewport, default = w_px/h_px;
полезно при selector чтобы page layout не collapsed),
wait_until, page_timeout_ms, opacity, z_order.
Dockerfile:
+ pip install playwright
+ playwright install --with-deps chromium (~170MB Chromium + ~150MB system libs)
Если dashboards не нужны — можно убрать оба install'а (playwright
import lazy, BrowserRenderer.start() graceful no-op без playwright).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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