From 4cb79888fe4ecff7900ebdb84b3b2a38a87a3c22 Mon Sep 17 00:00:00 2001
From: Jake Bentvelzen <doogie1012@gmail.com>
Date: Sun, 27 Jan 2019 23:30:30 +1100
Subject: [PATCH] graphics: Clear mipmap map to avoid unnecessary allocation
 (#799)

This change uses a pattern that Go 1.11+ compilers can optimize to a clear operation
https://github.com/golang/go/blob/master/doc/go1.11.html#L447
---
 image.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/image.go b/image.go
index 715c10ff7..38eeca93a 100644
--- a/image.go
+++ b/image.go
@@ -112,7 +112,9 @@ func (m *mipmap) disposeMipmaps() {
 			img.Dispose()
 		}
 	}
-	m.imgs = map[image.Rectangle][]*shareable.Image{}
+	for k := range m.imgs {
+		delete(m.imgs, k)
+	}
 }
 
 // Image represents a rectangle set of pixels.