From 6c47e31f491c5f66fe4146df00265b6cdd1ba9d3 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Fri, 22 Feb 2019 00:08:15 +0900
Subject: [PATCH] graphics: Do nothing at Dispose of a subimage

---
 image.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/image.go b/image.go
index 21925489f..ff56eeddb 100644
--- a/image.go
+++ b/image.go
@@ -634,10 +634,11 @@ func (i *Image) Dispose() error {
 	if i.isDisposed() {
 		return nil
 	}
-	if !i.isSubImage() {
-		i.mipmap.dispose()
-		i.resolvePixelsToSet(false)
+	if i.isSubImage() {
+		return nil
 	}
+	i.mipmap.dispose()
+	i.resolvePixelsToSet(false)
 	runtime.SetFinalizer(i, nil)
 	return nil
 }