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-rw-r--r--integral.go3
1 files changed, 3 insertions, 0 deletions
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]
}