From 7f182e7814cabbdc44ef77ba3e18c81141def3d8 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 8 Mar 2023 16:21:45 +0900
Subject: [PATCH] internal/restorable: skip basePixels.Clear when the region is
 empty

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

diff --git a/internal/restorable/image.go b/internal/restorable/image.go
index e09a09457..5d01b791e 100644
--- a/internal/restorable/image.go
+++ b/internal/restorable/image.go
@@ -248,6 +248,9 @@ func (i *Image) makeStale(rect image.Rectangle) {
 
 	// Clear pixels to save memory.
 	for _, r := range i.staleRegions[origNum:] {
+		if r.Empty() {
+			continue
+		}
 		i.basePixels.Clear(r.Min.X, r.Min.Y, r.Dx(), r.Dy())
 	}