[gnome-shell] Use Meta.BackgroundActor instances instead of cloning global.background_actor

[Rui Matos <rtcm src gnome org>]

commit 82ce8fe3ff2316af559e3d62d1858f18c4a91007
Author: Rui Matos <tiagomatos gmail com>
Date:   Mon Aug 29 02:37:41 2011 +0100

    Use Meta.BackgroundActor instances instead of cloning global.background_actor
    
    Instances of this class share a single CoglTexture behind the scenes which
    allows us to show the background with different rendering options without
    duplicating the texture data.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=656433

 js/ui/overview.js           |    9 ++++++---
 js/ui/workspaceThumbnail.js |    2 +-
 2 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/js/ui/overview.js b/js/ui/overview.js
index 0c5ea32..4ecc378 100644
--- a/js/ui/overview.js
+++ b/js/ui/overview.js
@@ -115,9 +115,12 @@ Overview.prototype = {
             return;
         }
 
-        // The actual global.background_actor is inside global.window_group,
-        // which is hidden when displaying the overview, so we display a clone.
-        this._background = new Clutter.Clone({ source: global.background_actor });
+        // The main BackgroundActor is inside global.window_group which is
+        // hidden when displaying the overview, so we create a new
+        // one. Instances of this class share a single CoglTexture behind the
+        // scenes which allows us to show the background with different
+        // rendering options without duplicating the texture data.
+        this._background = Meta.BackgroundActor.new_for_screen(global.screen);
         this._background.hide();
         global.overlay_group.add_actor(this._background);
 
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index 582842b..7a239ef 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -167,7 +167,7 @@ WorkspaceThumbnail.prototype = {
                 return true;
             }));
 
-        this._background = new Clutter.Clone({ source: global.background_actor });
+        this._background = Meta.BackgroundActor.new_for_screen(global.screen);
         this._contents.add_actor(this._background);
 
         let monitor = Main.layoutManager.primaryMonitor;