console: add unregister_displaychangelistener

Also change the way the gui_timer is initialized: each time a
displaychangelistener is registered or unregistered we'll check
whether we need a timer (due to dpy_refresh callback being present)
and if so setup a timer, otherwise zap it.  This way the gui timer
works correctly with displaychangelisteners coming and going.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/console.h b/console.h
index 4239eb346c..f476ac810d 100644
--- a/console.h
+++ b/console.h
@@ -229,9 +229,19 @@ static inline int is_buffer_shared(DisplaySurface *surface)
             !(surface->flags & QEMU_REALPIXELS_FLAG));
 }
 
+void gui_setup_refresh(DisplayState *ds);
+
 static inline void register_displaychangelistener(DisplayState *ds, DisplayChangeListener *dcl)
 {
     QLIST_INSERT_HEAD(&ds->listeners, dcl, next);
+    gui_setup_refresh(ds);
+}
+
+static inline void unregister_displaychangelistener(DisplayState *ds,
+                                                    DisplayChangeListener *dcl)
+{
+    QLIST_REMOVE(dcl, next);
+    gui_setup_refresh(ds);
 }
 
 static inline void dpy_update(DisplayState *s, int x, int y, int w, int h)