From 50ebdda3a97334e5411749cd0c309843ba8cdf44 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 19 Jul 2007 10:26:37 +0100
Subject: [PATCH] [cairo-pattern] Assert that the pattern->matrix is
 invertible.

We guarantee when setting the pattern->matrix that it is invertible, so
merely assert that it is so when we attempt to use its inverse.
---
 src/cairo-pattern.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/cairo-pattern.c b/src/cairo-pattern.c
index 2fd1c8725..43c9dc4ec 100644
--- a/src/cairo-pattern.c
+++ b/src/cairo-pattern.c
@@ -1979,8 +1979,8 @@ _cairo_pattern_get_extents (cairo_pattern_t         *pattern,
 
 	imatrix = pattern->matrix;
 	status = cairo_matrix_invert (&imatrix);
-	if (status)
-	    return status;
+	/* cairo_pattern_set_matrix ensures the matrix is invertible */
+	assert (status == CAIRO_STATUS_SUCCESS);
 
 	/* XXX Use _cairo_matrix_transform_bounding_box here */
 	for (sy = 0; sy <= 1; sy++) {