From 4950fdc3f8866f0af0de89d8f0777ec48c9eaef3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miguel=20=C3=81ngel?= <miguel.sierra@heygen.com>
Date: Fri, 23 Oct 2026 23:31:53 -0400
Subject: [PATCH 1/2] fix(core): color grading rebuilds the graded clips when a
 lost WebGL context is restored

A clip shown while the context was lost never got an entry.
---
 .../core/src/runtime/colorGrading.test.ts     | 39 +++++++++++++++++++
 packages/core/src/runtime/colorGrading.ts     |  2 +
 2 files changed, 41 insertions(+)

diff --git a/packages/core/src/runtime/colorGrading.test.ts b/packages/core/src/runtime/colorGrading.test.ts
index 66b241fe9e9..b157540e70e 100644
--- a/packages/core/src/runtime/colorGrading.test.ts
+++ b/packages/core/src/runtime/colorGrading.test.ts
@@ -2205,6 +2205,45 @@ describe("createColorGradingRuntime", () => {
   });
 });
 
+describe("createColorGradingRuntime after a context loss", () => {
+  it("grades a clip that came on screen while the context was lost once it is restored", () => {
+    let lost = false;
+    const gl = createMockWebGl();
+    gl.createTexture = vi.fn(() => (lost ? null : ({} as WebGLTexture)));
+    const spy = vi
+      .spyOn(HTMLCanvasElement.prototype, "getContext")
+      .mockImplementation(((type: string) =>
+        type === "webgl" ? gl : type === "2d" ? mock2d() : null) as never);
+    try {
+      document.body.innerHTML = "";
+      const first = makeDrawableVideo();
+      first.id = "first";
+      const second = makeDrawableVideo();
+      second.id = "second";
+      second.style.visibility = "hidden";
+      document.body.append(first, second);
+      const runtime = createColorGradingRuntime();
+      const shared = spy.mock.instances[0] as HTMLCanvasElement;
+
+      lost = true;
+      shared.dispatchEvent(new Event("webglcontextlost", { cancelable: true }));
+      second.style.visibility = "visible";
+      runtime.refresh();
+      expect(runtime.getStatus("#second").state).toBe("unavailable");
+
+      lost = false;
+      shared.dispatchEvent(new Event("webglcontextrestored"));
+
+      expect(runtime.getStatus("#first").state).toBe("active");
+      expect(runtime.getStatus("#second").state).toBe("active");
+      runtime.destroy();
+    } finally {
+      spy.mockRestore();
+      document.body.innerHTML = "";
+    }
+  });
+});
+
 describe("installAuthoredOpacityCapture", () => {
   it("stamps graded elements at insertion and never overwrites the stamp", async () => {
     installAuthoredOpacityCapture();
diff --git a/packages/core/src/runtime/colorGrading.ts b/packages/core/src/runtime/colorGrading.ts
index 110774fc1c0..2f586bf3282 100644
--- a/packages/core/src/runtime/colorGrading.ts
+++ b/packages/core/src/runtime/colorGrading.ts
@@ -3867,6 +3867,8 @@ export function createColorGradingRuntime(pausedMediaLease?: {
         if (entry.contextLost) restoreSourceElement(entry);
         else drawEntry(entry);
       }
+      // A clip shown while the context was gone got no entry; grade it now, not at the next scan.
+      refresh();
     });
     shared = { canvas, gl };
     return shared;

From 5896694de1fe41fd0d2ec96f9c8abfdcd2ed5ef7 Mon Sep 17 00:00:00 2001
From: Miguel Angel Simon Sierra <miguel.sierra@heygen.com>
Date: Sat, 24 Oct 2026 00:03:17 -0400
Subject: [PATCH 2/2] fix(core): drop the added comment line from the color
 grading restore fix

---
 packages/core/src/runtime/colorGrading.ts | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/core/src/runtime/colorGrading.ts b/packages/core/src/runtime/colorGrading.ts
index 2f586bf3282..6aacb0a6f31 100644
--- a/packages/core/src/runtime/colorGrading.ts
+++ b/packages/core/src/runtime/colorGrading.ts
@@ -3867,7 +3867,6 @@ export function createColorGradingRuntime(pausedMediaLease?: {
         if (entry.contextLost) restoreSourceElement(entry);
         else drawEntry(entry);
       }
-      // A clip shown while the context was gone got no entry; grade it now, not at the next scan.
       refresh();
     });
     shared = { canvas, gl };