From c4c9771b784cfc75c72279a7e30a0757eb2d104d Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Thu, 16 Jul 2020 02:59:50 +0900
Subject: [PATCH] mipmap: Bug fix: Infinite loop at
 (*Mipmap).mipmapLevelFromDistance

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

diff --git a/internal/mipmap/mipmap.go b/internal/mipmap/mipmap.go
index 1cccf6590..d8cb4554f 100644
--- a/internal/mipmap/mipmap.go
+++ b/internal/mipmap/mipmap.go
@@ -267,6 +267,9 @@ func (m *Mipmap) mipmapLevelFromDistance(dx0, dy0, dx1, dy1, sx0, sy0, sx1, sy1
 
 	d := (dx1-dx0)*(dx1-dx0) + (dy1-dy0)*(dy1-dy0)
 	s := (sx1-sx0)*(sx1-sx0) + (sy1-sy0)*(sy1-sy0)
+	if s == 0 {
+		return 0
+	}
 	scale := d / s
 
 	// Use 'negative' mipmap to render edges correctly (#611, #907).