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perf(studio): grow composition duration live on extend, no preview remount

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Extending a clip past the video end used to force the server-fallback
path that fully remounts the preview iframe (the SDK fast path can't
express the root composition's data-duration, and the runtime bakes+drops
data-duration at load so it can't be patched live). On a large comp that
remount is a visible hitch.

Add a runtime control-bridge action set-root-duration -> clock.setDuration,
so the studio can grow the transport length in place. On an extend the
studio now posts it (and patches the clip's own timing live) instead of
reloading; it only reloads when a GSAP source rewrite actually happened
(the gsap-mutation endpoints now report a mutated flag). Non-animated
extends — the common case — commit as fast as a normal edit.

Verified: bridge dispatch + studio no-reload/post-message paths unit-
tested; core/studio/studio-server typecheck + suites green; the built
runtime artifact carries the handler; E2E confirms the extend no longer
remounts the preview and still persists.
This commit is contained in:
Miguel Angel Simon Sierra
2026-07-08 23:46:28 -04:00
parent 580676bbf4
commit 9f6c20e482
9 changed files with 221 additions and 38 deletions
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packages/core/src/runtime/bridge.ts
+2
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@@ -14,6 +14,7 @@ type BridgeDeps = {
onSetNativeMediaSyncDisabled: (disabled: boolean) => void;
onSetWebAudioMediaDisabled: (disabled: boolean) => void;
onSetPlaybackRate: (rate: number) => void;
onSetRootDuration: (durationSeconds: number) => void;
onSetColorGrading: (target: HfColorGradingTarget | string | null, grading: unknown) => void;
onSetColorGradingCompare: (
target: HfColorGradingTarget | string | null,
@@ -53,6 +54,7 @@ const CONTROL_HANDLERS: Record<string, ControlHandler> = {
"set-web-audio-media-disabled": (data, deps) =>
deps.onSetWebAudioMediaDisabled(Boolean(data.disabled)),
"set-playback-rate": (data, deps) => deps.onSetPlaybackRate(Number(data.playbackRate ?? 1)),
"set-root-duration": (data, deps) => deps.onSetRootDuration(Number(data.durationSeconds ?? 0)),
"set-color-grading": (data, deps) =>
deps.onSetColorGrading(data.target ?? null, data.grading ?? null),
"set-color-grading-compare": (data, deps) =>