From afd5cd8441e337d570c52fa89abc06c99998eb1c Mon Sep 17 00:00:00 2001
From: Evert Prants <evert@lunasqu.ee>
Date: Sat, 2 Apr 2022 17:38:51 +0300
Subject: [PATCH] prevent duplicate writes

---
 src/server/object/canvas.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/server/object/canvas.ts b/src/server/object/canvas.ts
index dfdf1d4..986d84d 100644
--- a/src/server/object/canvas.ts
+++ b/src/server/object/canvas.ts
@@ -37,6 +37,12 @@ export class Canvas {
 
     const color = typeof pixel === 'string' ? storeHex(pixel) : pixel;
     const index = to1D(x, y, this.size);
+
+    // prevent duplicate writes
+    if (this._canvas[index] === color) {
+      return;
+    }
+
     const record = {
       user,
       color,