From 3dcb3d7ea7b904ea9cab42fa2795bae3a147f221 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 18 Aug 2021 01:39:04 +0900
Subject: [PATCH] ebiten: Refactoring: Skip Concat when the argument is an
 identity

---
 colorm.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/colorm.go b/colorm.go
index 08bd5c3bb..ac24568e6 100644
--- a/colorm.go
+++ b/colorm.go
@@ -66,7 +66,7 @@ func (c *ColorM) Apply(clr color.Color) color.Color {
 func (c *ColorM) Concat(other ColorM) {
 	o := other.impl
 	if o == nil {
-		o = affine.ColorMIdentity{}
+		return
 	}
 	c.impl = c.affineColorM().Concat(o)
 }