From 4a5ec4f03cf1061658648af5e3bfbe50c14f693b Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Thu, 17 Nov 2022 12:58:24 +0000
Subject: More bounds checking with bottomRight to prevent possible panic in
 zero size images

---
 integral.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/integral.go b/integral.go
index e3d09bb..99a4da7 100644
--- a/integral.go
+++ b/integral.go
@@ -176,6 +176,9 @@ func (i Image) bottomRight(r image.Rectangle) uint64 {
 	b := i.Bounds()
 	x := lowest(r.Max.X-1, b.Max.X-1)
 	y := lowest(r.Max.Y-1, b.Max.Y-1)
+	if x < 0 || y < 0 {
+		return 0
+	}
 	return i[y][x]
 }
 
-- 
cgit v1.2.1-24-ge1ad