From 5c3f8915d1b7e42f75628ec4d0ca3526d812bcc8 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 21 Mar 2022 15:11:38 +0900
Subject: [PATCH] internal/atlas: add an argument check

---
 internal/atlas/image.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/internal/atlas/image.go b/internal/atlas/image.go
index 26f289ae4..5e29ac09a 100644
--- a/internal/atlas/image.go
+++ b/internal/atlas/image.go
@@ -563,6 +563,9 @@ func (i *Image) replacePixels(pix []byte, mask []byte) {
 
 	px, py, pw, ph := i.regionWithPadding()
 	if pix == nil {
+		if mask != nil {
+			panic("atlas: mask must be nil when pix is nil")
+		}
 		i.backend.restorable.ReplacePixels(nil, nil, px, py, pw, ph)
 		return
 	}