From 2cd1657ebcae761d9c56aa5e59619afa3976f09f Mon Sep 17 00:00:00 2001
From: Haoming <hmstudy02@gmail.com>
Date: Thu, 8 Jan 2026 23:06:55 +0800
Subject: [PATCH] stacking

---
 modules_forge/forge_canvas/canvas.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/modules_forge/forge_canvas/canvas.js b/modules_forge/forge_canvas/canvas.js
index f7c976b1..01004823 100644
--- a/modules_forge/forge_canvas/canvas.js
+++ b/modules_forge/forge_canvas/canvas.js
@@ -543,6 +543,13 @@ class ForgeCanvas {
         }
 
         if (this.scribbleSoftness <= 0) {
+            ctx.save();
+            ctx.globalCompositeOperation = "destination-out";
+            ctx.globalAlpha = 1.0;
+            ctx.stroke();
+            ctx.restore();
+
+            ctx.globalCompositeOperation = "source-over";
             ctx.globalAlpha = drawingAlpha / 100.0;
             ctx.stroke();
             return;