xwayland: Add fallback timer for msc counting

When the compositor is not sending frame callbacks while we still wait
on buffer release events fake a continuous msc counter with a timer.

Having this timer is a prerequisite for queuing events.

Signed-off-by: Roman Gilg <subdiff@gmail.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/hw/xwayland/xwayland.h b/hw/xwayland/xwayland.h
index dd7d1c685..e6cec18b8 100644
--- a/hw/xwayland/xwayland.h
+++ b/hw/xwayland/xwayland.h
@@ -135,6 +135,9 @@ struct xwl_window {
     uint64_t present_msc;
     uint64_t present_ust;
 
+    OsTimerPtr present_timer;
+    Bool present_timer_firing;
+
     struct wl_callback *present_frame_callback;
     struct wl_callback *present_sync_callback;
     struct xorg_list present_release_queue;