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compositor/x11: Notify the sync ring about frames on updates

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The sync ring has an API about "frames", where it is notified about
the end of frames. However, its "insert wait" call is done before
updates, meaning that some "insert waits" will never see the "after
frame" if there was no frame drawn. This will cause mismatching in the
frame counting, causing freezes in the synchronization until something
else triggers an actual frame, effectively "unfreezing" the sync ring.

Fix this by not only notifying the sync ring about frames when there
were actual frames drawn, but also on plain updates which didn't result
in a drawn frame.

Related: https://gitlab.gnome.org/GNOME/mutter/-/issues/1516
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1754>
This commit is contained in:
Jonas Ådahl 2021-03-04 19:11:12 +01:00 committed by Marge Bot
parent c2968c89fe
commit 44a4e61665
1 changed files with 21 additions and 20 deletions
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41
src/compositor/meta-compositor-x11.c
View File

@ -40,6 +40,7 @@ struct _MetaCompositorX11
Window output;
gulong before_update_handler_id;
gulong after_update_handler_id;
gboolean frame_has_updated_xsurfaces;
gboolean have_x11_sync_object;
@ -362,6 +363,22 @@ on_before_update (ClutterStage *stage,
}
}
static void
on_after_update (ClutterStage *stage,
ClutterStageView *stage_view,
MetaCompositor *compositor)
{
MetaCompositorX11 *compositor_x11 = META_COMPOSITOR_X11 (compositor);
if (compositor_x11->frame_has_updated_xsurfaces)
{
if (compositor_x11->have_x11_sync_object)
compositor_x11->have_x11_sync_object = meta_sync_ring_after_frame ();
compositor_x11->frame_has_updated_xsurfaces = FALSE;
}
}
static void
meta_compositor_x11_before_paint (MetaCompositor *compositor,
ClutterStageView *stage_view)
@ -375,25 +392,6 @@ meta_compositor_x11_before_paint (MetaCompositor *compositor,
parent_class->before_paint (compositor, stage_view);
}
static void
meta_compositor_x11_after_paint (MetaCompositor *compositor,
ClutterStageView *stage_view)
{
MetaCompositorX11 *compositor_x11 = META_COMPOSITOR_X11 (compositor);
MetaCompositorClass *parent_class;
if (compositor_x11->frame_has_updated_xsurfaces)
{
if (compositor_x11->have_x11_sync_object)
compositor_x11->have_x11_sync_object = meta_sync_ring_after_frame ();
compositor_x11->frame_has_updated_xsurfaces = FALSE;
}
parent_class = META_COMPOSITOR_CLASS (meta_compositor_x11_parent_class);
parent_class->after_paint (compositor, stage_view);
}
static void
meta_compositor_x11_remove_window (MetaCompositor *compositor,
MetaWindow *window)
@ -481,6 +479,9 @@ meta_compositor_x11_constructed (GObject *object)
compositor_x11->before_update_handler_id =
g_signal_connect (stage, "before-update",
G_CALLBACK (on_before_update), compositor);
compositor_x11->after_update_handler_id =
g_signal_connect (stage, "after-update",
G_CALLBACK (on_after_update), compositor);
G_OBJECT_CLASS (meta_compositor_x11_parent_class)->constructed (object);
}
@ -499,6 +500,7 @@ meta_compositor_x11_dispose (GObject *object)
}
g_clear_signal_handler (&compositor_x11->before_update_handler_id, stage);
g_clear_signal_handler (&compositor_x11->after_update_handler_id, stage);
G_OBJECT_CLASS (meta_compositor_x11_parent_class)->dispose (object);
}
@ -520,7 +522,6 @@ meta_compositor_x11_class_init (MetaCompositorX11Class *klass)
compositor_class->manage = meta_compositor_x11_manage;
compositor_class->unmanage = meta_compositor_x11_unmanage;
compositor_class->before_paint = meta_compositor_x11_before_paint;
compositor_class->after_paint = meta_compositor_x11_after_paint;
compositor_class->remove_window = meta_compositor_x11_remove_window;
compositor_class->monotonic_to_high_res_xserver_time =
meta_compositor_x11_monotonic_to_high_res_xserver_time;