From 5ae208b17479c52e46b3bffd592dc232e851dfa7 Mon Sep 17 00:00:00 2001
From: Yun Feng <yun.feng@anu.edu.au>
Date: Thu, 24 Feb 2022 12:02:47 +1100
Subject: [PATCH] fix: Uncaught TypeError: Illegal invocation when recording
 incremental canvas mutation (#844)

---
 packages/rrweb-snapshot/src/utils.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/rrweb-snapshot/src/utils.ts b/packages/rrweb-snapshot/src/utils.ts
index 2b059765..7f848099 100644
--- a/packages/rrweb-snapshot/src/utils.ts
+++ b/packages/rrweb-snapshot/src/utils.ts
@@ -60,7 +60,8 @@ export function is2DCanvasBlank(canvas: HTMLCanvasElement): boolean {
       // even if we can already tell from the first chunk(s) that
       // the canvas isn't blank
       const pixelBuffer = new Uint32Array(
-        originalGetImageData(
+        originalGetImageData.call(
+          ctx,
           x,
           y,
           Math.min(chunkSize, canvas.width - x),