From 0c02b998f9e8589a90b2e744392995903b94414f Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 26 Oct 2007 18:06:36 +0100
Subject: [PATCH] [cairo-gstate] Allow angle==0 whilst rotating.

Cut'n'paste error whilst copying the NaN check from
_cairo_gstate_scale() flagged the no rotation case as an error.
---
 src/cairo-gstate.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c
index 1d706114e..0c6b2170f 100644
--- a/src/cairo-gstate.c
+++ b/src/cairo-gstate.c
@@ -663,7 +663,10 @@ _cairo_gstate_rotate (cairo_gstate_t *gstate, double angle)
 {
     cairo_matrix_t tmp;
 
-    if (! (angle * angle > 0.)) /* check for NaNs */
+    if (angle == 0.)
+	return CAIRO_STATUS_SUCCESS;
+
+    if (! (angle * angle >= 0.)) /* check for NaNs */
 	return _cairo_error (CAIRO_STATUS_INVALID_MATRIX);
 
     _cairo_gstate_unset_scaled_font (gstate);