From 451a0510324491e82269d8e0d997ee4707ba8df8 Mon Sep 17 00:00:00 2001
From: =?utf8?q?S=C3=B8ren=20Sandmann=20Pedersen?= <sandmann@redhat.com>
Date: Fri, 15 Jun 2007 14:33:57 -0400
Subject: [PATCH] When setting identity transformations store them as NULL to
 prevent

hitting the general compositing code.
---
 pixman/pixman-image.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pixman/pixman-image.c b/pixman/pixman-image.c
index 8657c31..c08e8fc 100644
--- a/pixman/pixman-image.c
+++ b/pixman/pixman-image.c
@@ -371,11 +371,25 @@ pixman_bool_t
 pixman_image_set_transform (pixman_image_t           *image,
 			    const pixman_transform_t *transform)
 {
+    static const pixman_transform_t id =
+    {
+	{ { pixman_fixed_1, 0, 0 },
+	  { 0, pixman_fixed_1, 0 },
+	  { 0, 0, pixman_fixed_1 }
+	}
+    };
+    
     image_common_t *common = (image_common_t *)image;
 
     if (common->transform == transform)
 	return TRUE;
 
+    if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
+    {
+	transform = NULL;
+	return TRUE;
+    }
+    
     if (common->transform)
 	free (common->transform);
 
-- 
2.7.4