From be126b6842e979dbcb306b2f9f41a2114a149b9a Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sat, 5 Jan 2008 19:22:57 +0000
Subject: [PATCH] [cairo-analysis-surface] Check for an empty transformed bbox.

After transforming the bbox, check that it has not been projected into
an empty box.
---
 src/cairo-analysis-surface.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/cairo-analysis-surface.c b/src/cairo-analysis-surface.c
index 1276a3540..b4213b240 100644
--- a/src/cairo-analysis-surface.c
+++ b/src/cairo-analysis-surface.c
@@ -115,8 +115,14 @@ _cairo_analysis_surface_add_operation  (cairo_analysis_surface_t *surface,
 					      NULL);
 	rect->x = floor (x1);
 	rect->y = floor (x2);
-	rect->width = ceil (x2) - rect->x;
-	rect->height = ceil (y2) - rect->y;
+
+	x2 = ceil (x2) - rect->x;
+	y2 = ceil (y2) - rect->y;
+	if (x2 <= 0 || y2 <= 0)
+	    return CAIRO_STATUS_SUCCESS;
+
+	rect->width  = x2;
+	rect->height = y2;
     }
 
     bbox.p1.x = _cairo_fixed_from_int (rect->x);