fix(overlay): Linux X11/XWayland stacking, stale pause state, multi-copy selector (#101)

src/main/runtime/visible-overlay-autoplay-readiness.ts

@@ -0,0 +1,48 @@
+import type { OverlayContentMeasurement, OverlayContentRect } from '../../types';
+import type { AutoplayReadySignal } from './autoplay-ready-gate';
+
+export type VisibleOverlayAutoplayReadinessDeps = {
+  getVisibleOverlayVisible: () => boolean;
+  isOverlayWindowReady: () => boolean;
+  getLatestVisibleMeasurement: () => OverlayContentMeasurement | null;
+};
+
+function hasArea(rect: OverlayContentRect): boolean {
+  return rect.width > 0 && rect.height > 0;
+}
+
+function hasMeasuredInteractiveContent(measurement: OverlayContentMeasurement): boolean {
+  const rects =
+    Array.isArray(measurement.interactiveRects) && measurement.interactiveRects.some(hasArea)
+      ? measurement.interactiveRects
+      : measurement.contentRect
+        ? [measurement.contentRect]
+        : [];
+
+  return rects.some(hasArea);
+}
+
+export function isVisibleOverlayAutoplayTargetReady(
+  deps: VisibleOverlayAutoplayReadinessDeps,
+  signal: AutoplayReadySignal,
+): boolean {
+  if (!deps.getVisibleOverlayVisible()) {
+    return true;
+  }
+
+  const subtitleText = signal.payload.text.trim();
+  if (!subtitleText || subtitleText === '__warm__') {
+    return false;
+  }
+
+  if (!deps.isOverlayWindowReady()) {
+    return false;
+  }
+
+  const measurement = deps.getLatestVisibleMeasurement();
+  if (!measurement || measurement.measuredAtMs < signal.requestedAtMs) {
+    return false;
+  }
+
+  return hasMeasuredInteractiveContent(measurement);
+}