From 0ceff436b01bd36258b9b721d10cdfe349917951 Mon Sep 17 00:00:00 2001
From: Ivan Liang <r33t@cmu.edu>
Date: Tue, 16 Jan 2024 12:45:56 -0500
Subject: [PATCH] Don't getCameraImagePixels on detached/0len buffer

---
 src/systems/armarker/camera-capture/ccarheadset.js | 3 +++
 src/systems/armarker/camera-capture/ccwebar.js     | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/src/systems/armarker/camera-capture/ccarheadset.js b/src/systems/armarker/camera-capture/ccarheadset.js
index 61ad28e2c..c9c83342f 100644
--- a/src/systems/armarker/camera-capture/ccarheadset.js
+++ b/src/systems/armarker/camera-capture/ccarheadset.js
@@ -190,6 +190,9 @@ export default class ARHeadsetCameraCapture {
      * @private
      */
     async getCameraImagePixels(time) {
+        if (this.frameGsPixels.length === 0) {
+            return;
+        }
         let imageData;
         try {
             this.canvasCtx.drawImage(this.video, 0, 0, this.frameWidth, this.frameHeight);
diff --git a/src/systems/armarker/camera-capture/ccwebar.js b/src/systems/armarker/camera-capture/ccwebar.js
index e07219a84..2082d7d39 100644
--- a/src/systems/armarker/camera-capture/ccwebar.js
+++ b/src/systems/armarker/camera-capture/ccwebar.js
@@ -166,6 +166,9 @@ export default class WebARCameraCapture {
      * @private
      */
     async getCameraImagePixels(time) {
+        if (this.frameGsPixels.length === 0) {
+            return;
+        }
         let imageData;
         try {
             this.canvasCtx.drawImage(this.video, 0, 0, this.frameWidth, this.frameHeight);