From dab1412d4b483fe707f46fc06b7f4a32a996b33f Mon Sep 17 00:00:00 2001
From: Benjamin Noah Beal <bnoahbeal@gmail.com>
Date: Sat, 30 Sep 2023 11:08:34 -0700
Subject: [PATCH] Add willReadFrequently to 2d canvas contexts to heatmap

---
 src/traces/heatmap/plot.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/traces/heatmap/plot.js b/src/traces/heatmap/plot.js
index e0afbf5cb5d..a31513cdc4e 100644
--- a/src/traces/heatmap/plot.js
+++ b/src/traces/heatmap/plot.js
@@ -162,7 +162,7 @@ module.exports = function(gd, plotinfo, cdheatmaps, heatmapLayer) {
         var canvas = document.createElement('canvas');
         canvas.width = canvasW;
         canvas.height = canvasH;
-        var context = canvas.getContext('2d');
+        var context = canvas.getContext('2d', {willReadFrequently: true});
 
         var sclFunc = makeColorScaleFuncFromTrace(trace, {noNumericCheck: true, returnArray: true});