[mutter/gbsneto/more-screencast: 14/19] clutter/stage: Add new before_paint signal hook

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 9e011958d43e24997eb76d0e06f14f0d3a69c27f
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Aug 31 10:22:35 2020 -0300

    clutter/stage: Add new before_paint signal hook
    
    It'll allow subclasses to get notified of the before-paint
    signal without having to connect to it. This will allow
    MetaStage to have proper watches being fired there without
    the cost of the signal handling machinery.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1421

 clutter/clutter/clutter-stage.c | 2 +-
 clutter/clutter/clutter-stage.h | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 0900212b00..e4c129eada 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -1874,7 +1874,7 @@ clutter_stage_class_init (ClutterStageClass *klass)
     g_signal_new (I_("before-paint"),
                   G_TYPE_FROM_CLASS (gobject_class),
                   G_SIGNAL_RUN_LAST,
-                  0,
+                  G_STRUCT_OFFSET (ClutterStageClass, before_paint),
                   NULL, NULL, NULL,
                   G_TYPE_NONE, 1,
                   CLUTTER_TYPE_STAGE_VIEW);
diff --git a/clutter/clutter/clutter-stage.h b/clutter/clutter/clutter-stage.h
index cceb8d8362..7d94b68c38 100644
--- a/clutter/clutter/clutter-stage.h
+++ b/clutter/clutter/clutter-stage.h
@@ -80,6 +80,9 @@ struct _ClutterStageClass
   void (* activate)     (ClutterStage *stage);
   void (* deactivate)   (ClutterStage *stage);
 
+  void (* before_paint) (ClutterStage     *stage,
+                         ClutterStageView *view);
+
   void (* paint_view) (ClutterStage         *stage,
                        ClutterStageView     *view,
                        const cairo_region_t *redraw_clip);