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cliptest: Avoid use of uninitialized memory when regions don't intersect
author
Derek Foreman
<derekf@osg.samsung.com>
Mon, 18 Aug 2014 21:13:41 +0000
(16:13 -0500)
committer
Pekka Paalanen
<pekka.paalanen@collabora.co.uk>
Tue, 19 Aug 2014 09:46:11 +0000
(12:46 +0300)
Prevent attempting to draw the intersection polygon when it contains no
vertices.
Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
clients/cliptest.c
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diff --git
a/clients/cliptest.c
b/clients/cliptest.c
index
612b3d1
..
907c5d4
100644
(file)
--- a/
clients/cliptest.c
+++ b/
clients/cliptest.c
@@
-570,12
+570,14
@@
draw_geometry(cairo_t *cr, struct weston_surface *surface,
cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 0.4);
cairo_fill(cr);
- draw_polygon_closed(cr, ex, ey, n);
- cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
- cairo_stroke(cr);
+ if (n) {
+ draw_polygon_closed(cr, ex, ey, n);
+ cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
+ cairo_stroke(cr);
- cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 0.5);
- draw_polygon_labels(cr, ex, ey, n);
+ cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 0.5);
+ draw_polygon_labels(cr, ex, ey, n);
+ }
}
static void