From 4bbe48946ae3f1e6039f34ca659875f307be1de3 Mon Sep 17 00:00:00 2001
From: abrahamjuliot <abrahamjuliot@gmail.com>
Date: Fri, 11 Jun 2021 00:37:06 +0000
Subject: [PATCH] use more stable detection for strict mode #16

---
 modules/helpers.js | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/modules/helpers.js b/modules/helpers.js
index d378dfe9..4adb7cc5 100644
--- a/modules/helpers.js
+++ b/modules/helpers.js
@@ -14,14 +14,25 @@ function getBraveMode() {
 		strict: false
 	}
 	try {
-		// strict mode limits supported extensions
-		const canvas = document.createElement('canvas')
-		const gl = canvas.getContext('webgl')
-		const extensions = gl.getSupportedExtensions()
-		if (
-			!extensions || (
-				new Set(extensions).size == 1 && extensions[0] == 'WEBGL_debug_renderer_info')
-		) {
+		// strict mode adds float frequency data AnalyserNode
+		const strictMode = () => {
+			const audioContext = (
+				'OfflineAudioContext' in window ? OfflineAudioContext : 
+				'webkitOfflineAudioContext' in window ? webkitOfflineAudioContext :
+				undefined
+			)
+			if (!audioContext) {
+				return false
+			}
+			const context = new audioContext(1, 1, 44100)
+			const analyser = context.createAnalyser()
+			const data = new Float32Array(analyser.frequencyBinCount)
+			analyser.getFloatFrequencyData(data)
+			const strict = new Set(data).size > 1 // native only has -Infinity
+			return strict
+		}
+		
+		if (strictMode()) {
 			mode.strict = true
 			return mode
 		}