From 41a7f9d7d6fdc0bfd1c9e7d4cc00532512474de2 Mon Sep 17 00:00:00 2001
From: MediaPipe Team <mediapipe-team@google.com>
Date: Wed, 23 Nov 2022 15:23:02 -0800
Subject: [PATCH] Internal change

PiperOrigin-RevId: 490595529
---
 mediapipe/web/graph_runner/graph_runner.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mediapipe/web/graph_runner/graph_runner.ts b/mediapipe/web/graph_runner/graph_runner.ts
index c4654794c..378bc0a4d 100644
--- a/mediapipe/web/graph_runner/graph_runner.ts
+++ b/mediapipe/web/graph_runner/graph_runner.ts
@@ -176,10 +176,14 @@ export class GraphRunner {
 
     if (glCanvas !== undefined) {
       this.wasmModule.canvas = glCanvas;
-    } else {
+    } else if (typeof OffscreenCanvas !== 'undefined') {
       // If no canvas is provided, assume Chrome/Firefox and just make an
       // OffscreenCanvas for GPU processing.
       this.wasmModule.canvas = new OffscreenCanvas(1, 1);
+    } else {
+      console.warn('OffscreenCanvas not detected and GraphRunner constructor '
+                 + 'glCanvas parameter is undefined. Creating backup canvas.');
+      this.wasmModule.canvas = document.createElement('canvas');
     }
   }