From f7738b812b3ee654d27266cc19788ae2c12346a6 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Mon, 6 Sep 2021 12:11:52 +0900
Subject: [PATCH] internal/mipmap: Skip color scaling when possible

---
 internal/mipmap/mipmap.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/mipmap/mipmap.go b/internal/mipmap/mipmap.go
index 7d1ae8d24..d76796abe 100644
--- a/internal/mipmap/mipmap.go
+++ b/internal/mipmap/mipmap.go
@@ -123,7 +123,7 @@ func (m *Mipmap) DrawTriangles(srcs [graphics.ShaderImageNum]*Mipmap, vertices [
 		}
 	}
 
-	if colorm.ScaleOnly() {
+	if !colorm.IsIdentity() && colorm.ScaleOnly() {
 		cr := colorm.At(0, 0)
 		cg := colorm.At(1, 1)
 		cb := colorm.At(2, 2)