From 9d2189afbd2aa1413f620a4d35016ef3be3fc0e9 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 22 Oct 2008 18:29:02 +0100
Subject: [PATCH] [pattern] Do not recompute the inverse if setting an
 identical matrix.

More micro-optimisation.
---
 src/cairo-pattern.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cairo-pattern.c b/src/cairo-pattern.c
index 81fa62ad5..064eeb6c7 100644
--- a/src/cairo-pattern.c
+++ b/src/cairo-pattern.c
@@ -1055,6 +1055,9 @@ cairo_pattern_set_matrix (cairo_pattern_t      *pattern,
     if (pattern->status)
 	return;
 
+    if (memcmp (&pattern->matrix, matrix, sizeof (cairo_matrix_t)) == 0)
+	return;
+
     pattern->matrix = *matrix;
 
     inverse = *matrix;