From d75f68227e511e419b0c5b7275888a472896485f Mon Sep 17 00:00:00 2001
From: Vladimir Mandic <mandic00@live.com>
Date: Tue, 27 Oct 2020 11:56:41 -0400
Subject: [PATCH] fix firefox compatibility bug

---
 src/human.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/human.js b/src/human.js
index b862955e..4730b5ea 100644
--- a/src/human.js
+++ b/src/human.js
@@ -139,8 +139,9 @@ class Human {
       let targetHeight = originalHeight;
       if (this.config.filter.height > 0) targetHeight = this.config.filter.height;
       else if (this.config.filter.width > 0) targetHeight = originalHeight * (this.config.filter.width / originalWidth);
-
-      const offscreenCanvas = new OffscreenCanvas(targetWidth, targetHeight);
+      const offscreenCanvas = (typeof OffscreenCanvas !== 'undefined') ? new OffscreenCanvas(targetWidth, targetHeight) : document.createElement('canvas');
+      offscreenCanvas.width = targetWidth;
+      offscreenCanvas.height = targetHeight;
       const ctx = offscreenCanvas.getContext('2d');
       if (input instanceof ImageData) ctx.putImageData(input, 0, 0);
       else ctx.drawImage(input, 0, 0, originalWidth, originalHeight, 0, 0, offscreenCanvas.width, offscreenCanvas.height);