From 2f4d50c723c3794b701dbbb45e45d7ad6680a6f2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Thu, 25 Jun 2020 16:00:15 +0200
Subject: [PATCH] clutter/actor: Add API to check whether actor or clone is on
 view

The new function returns TRUE if an actor is effectively on the passed
view, where effectively refers to itself or a clone containing itself.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1285
---
 clutter/clutter/clutter-actor.c  | 34 ++++++++++++++++++++++++++++++++
 clutter/clutter/clutter-mutter.h |  4 ++++
 2 files changed, 38 insertions(+)

diff --git a/clutter/clutter/clutter-actor.c b/clutter/clutter/clutter-actor.c
index 3662689ff..1bd88bcd3 100644
--- a/clutter/clutter/clutter-actor.c
+++ b/clutter/clutter/clutter-actor.c
@@ -16258,6 +16258,40 @@ clutter_actor_peek_stage_views (ClutterActor *self)
   return self->priv->stage_views;
 }
 
+gboolean
+clutter_actor_is_effectively_on_stage_view (ClutterActor     *self,
+                                            ClutterStageView *view)
+{
+  ClutterActor *actor;
+
+  g_return_val_if_fail (CLUTTER_IS_ACTOR (self), FALSE);
+
+  if (g_list_find (self->priv->stage_views, view))
+    return TRUE;
+
+  for (actor = self; actor; actor = actor->priv->parent)
+    {
+      if (actor->priv->clones)
+        {
+          GHashTableIter iter;
+          gpointer key;
+
+          g_hash_table_iter_init (&iter, actor->priv->clones);
+          while (g_hash_table_iter_next (&iter, &key, NULL))
+            {
+              ClutterActor *clone = key;
+              GList *clone_views;
+
+              clone_views = clutter_actor_peek_stage_views (clone);
+              if (g_list_find (clone_views, view))
+                return TRUE;
+            }
+        }
+    }
+
+  return FALSE;
+}
+
 /**
  * clutter_actor_pick_frame_clock:
  * @self: a #ClutterActor
diff --git a/clutter/clutter/clutter-mutter.h b/clutter/clutter/clutter-mutter.h
index 5aa9a7e14..6ca7904b2 100644
--- a/clutter/clutter/clutter-mutter.h
+++ b/clutter/clutter/clutter-mutter.h
@@ -39,6 +39,10 @@
 CLUTTER_EXPORT
 GList * clutter_stage_peek_stage_views (ClutterStage *stage);
 
+CLUTTER_EXPORT
+gboolean clutter_actor_is_effectively_on_stage_view (ClutterActor     *self,
+                                                     ClutterStageView *view);
+
 CLUTTER_EXPORT
 void clutter_set_custom_backend_func (ClutterBackend *(* func) (void));