waylandsink: Clear window when pipeline is stopped

When a pipeline is stopped (actually when the waylandsink element
state changes from PAUSED to READY) the video surface is cleared, but
the opaque black surface behind is not. Fix this by actually clearing
both surfaces.

diff --git a/ext/wayland/wlwindow.c b/ext/wayland/wlwindow.c
index 5015879..0cf85aa 100644 (file)
--- a/ext/wayland/wlwindow.c
+++ b/ext/wayland/wlwindow.c
@@ -462,14 +462,18 @@ gst_wl_window_render (GstWlWindow * window, GstWlBuffer * buffer,
     gst_wl_window_set_opaque (window, info);
   }
 
-  if (G_LIKELY (buffer))
+  if (G_LIKELY (buffer)) {
     gst_wl_buffer_attach (buffer, window->video_surface_wrapper);
-  else
+    wl_surface_damage (window->video_surface_wrapper, 0, 0,
+        window->video_rectangle.w, window->video_rectangle.h);
+    wl_surface_commit (window->video_surface_wrapper);
+  } else {
+    /* clear both video and parent surfaces */
     wl_surface_attach (window->video_surface_wrapper, NULL, 0, 0);
-
-  wl_surface_damage (window->video_surface_wrapper, 0, 0,
-      window->video_rectangle.w, window->video_rectangle.h);
-  wl_surface_commit (window->video_surface_wrapper);
+    wl_surface_commit (window->video_surface_wrapper);
+    wl_surface_attach (window->area_surface_wrapper, NULL, 0, 0);
+    wl_surface_commit (window->area_surface_wrapper);
+  }
 
   if (G_UNLIKELY (info)) {
     /* commit also the parent (area_surface) in order to change