arc: Just emit a line-to if radius is zero.

In order to be consistent with the semantics of cairo_arc() using a
radius of 0 should simply degenerate into a line-to.

Reported-by: Benjamin Berg

1 files changed, 3 insertions, 1 deletions

diff --git a/src/cairo.c b/src/cairo.c
index 8d1631452..3c9d892ea 100644
--- a/src/cairo.c
+++ b/src/cairo.c
@@ -1678,8 +1678,10 @@ cairo_arc (cairo_t *cr,
 	return;
 
     /* Do nothing, successfully, if radius is <= 0 */
-    if (radius <= 0.0)
+    if (radius <= 0.0) {
+	cairo_line_to (cr, xc, yc);
 	return;
+    }
 
     while (angle2 < angle1)
 	angle2 += 2 * M_PI;