sna: Add some paranoid asserts around get_window_pixmap()

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sna/sna.h b/src/sna/sna.h
index 206ecc98..498149da 100644
--- a/src/sna/sna.h
+++ b/src/sna/sna.h
@@ -188,6 +188,8 @@ static inline WindowPtr get_root_window(ScreenPtr screen)
 
 static inline PixmapPtr get_window_pixmap(WindowPtr window)
 {
+	assert(window);
+	assert(window->drawable.type != DRAWABLE_PIXMAP);
 	return fbGetWindowPixmap(window);
 }