[mutter/wayland: 4/5] MetaSurfaceActor: move freeze accounting to MetaWindowActor

[Giovanni Campagna <gcampagna src gnome org>]

commit 153f843ea68f5ec78274596da8f361f08cb9cafa
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Mon Feb 24 22:00:12 2014 +0100

    MetaSurfaceActor: move freeze accounting to MetaWindowActor
    
    Turns out we only ever need to freeze/thaw whole windows, not
    surfaces or subsurfaces.
    This will allow removing the surface actor without losing
    the count.

 src/compositor/meta-surface-actor.c |   36 ++++++++--------------------------
 src/compositor/meta-surface-actor.h |    5 +--
 src/compositor/meta-window-actor.c  |   21 ++++++++++++++-----
 3 files changed, 26 insertions(+), 36 deletions(-)
---
diff --git a/src/compositor/meta-surface-actor.c b/src/compositor/meta-surface-actor.c
index f82a6a9..1c795d5 100644
--- a/src/compositor/meta-surface-actor.c
+++ b/src/compositor/meta-surface-actor.c
@@ -26,8 +26,8 @@ struct _MetaSurfaceActorPrivate
   cairo_region_t *input_region;
 
   /* Freeze/thaw accounting */
-  guint freeze_count;
   guint needs_damage_all : 1;
+  guint frozen : 1;
 };
 
 static void cullable_iface_init (MetaCullableInterface *iface);
@@ -223,7 +223,7 @@ static gboolean
 is_frozen (MetaSurfaceActor *self)
 {
   MetaSurfaceActorPrivate *priv = self->priv;
-  return (priv->freeze_count > 0);
+  return priv->frozen;
 }
 
 void
@@ -274,31 +274,19 @@ meta_surface_actor_is_visible (MetaSurfaceActor *self)
 }
 
 void
-meta_surface_actor_freeze (MetaSurfaceActor *self)
+meta_surface_actor_set_frozen (MetaSurfaceActor *self,
+                               gboolean          frozen)
 {
   MetaSurfaceActorPrivate *priv = self->priv;
 
-  priv->freeze_count ++;
-}
+  priv->frozen = frozen;
 
-void
-meta_surface_actor_thaw (MetaSurfaceActor *self)
-{
-  MetaSurfaceActorPrivate *priv = self->priv;
-
-  if (priv->freeze_count == 0)
+  if (!frozen && priv->needs_damage_all)
     {
-      g_critical ("Error in freeze/thaw accounting.");
-      return;
-    }
+      /* Since we ignore damage events while a window is frozen for certain effects
+       * we may need to issue an update_area() covering the whole pixmap if we
+       * don't know what real damage has happened. */
 
-  priv->freeze_count --;
-
-  /* Since we ignore damage events while a window is frozen for certain effects
-   * we may need to issue an update_area() covering the whole pixmap if we
-   * don't know what real damage has happened. */
-  if (priv->needs_damage_all)
-    {
       meta_surface_actor_process_damage (self, 0, 0,
                                          clutter_actor_get_width (CLUTTER_ACTOR (priv->texture)),
                                          clutter_actor_get_height (CLUTTER_ACTOR (priv->texture)));
@@ -307,12 +295,6 @@ meta_surface_actor_thaw (MetaSurfaceActor *self)
 }
 
 gboolean
-meta_surface_actor_is_frozen (MetaSurfaceActor *self)
-{
-  return is_frozen (self);
-}
-
-gboolean
 meta_surface_actor_should_unredirect (MetaSurfaceActor *self)
 {
   return META_SURFACE_ACTOR_GET_CLASS (self)->should_unredirect (self);
diff --git a/src/compositor/meta-surface-actor.h b/src/compositor/meta-surface-actor.h
index 763f91d..a92f6f7 100644
--- a/src/compositor/meta-surface-actor.h
+++ b/src/compositor/meta-surface-actor.h
@@ -69,9 +69,8 @@ void meta_surface_actor_pre_paint (MetaSurfaceActor *actor);
 gboolean meta_surface_actor_is_argb32 (MetaSurfaceActor *actor);
 gboolean meta_surface_actor_is_visible (MetaSurfaceActor *actor);
 
-void meta_surface_actor_freeze (MetaSurfaceActor *actor);
-void meta_surface_actor_thaw (MetaSurfaceActor *actor);
-gboolean meta_surface_actor_is_frozen (MetaSurfaceActor *actor);
+void meta_surface_actor_set_frozen (MetaSurfaceActor *actor,
+                                    gboolean          frozen);
 
 gboolean meta_surface_actor_should_unredirect (MetaSurfaceActor *actor);
 void meta_surface_actor_set_unredirected (MetaSurfaceActor *actor,
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index d2c16b1..14c12ee 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -84,6 +84,7 @@ struct _MetaWindowActorPrivate
 
   /* List of FrameData for recent frames */
   GList            *frames;
+  guint             freeze_count;
 
   guint                    visible                : 1;
   guint                    disposed               : 1;
@@ -269,14 +270,19 @@ static gboolean
 is_frozen (MetaWindowActor *self)
 {
   MetaWindowActorPrivate *priv = self->priv;
-  return meta_surface_actor_is_frozen (priv->surface);
+
+  return priv->freeze_count > 0;
 }
 
 static void
 meta_window_actor_freeze (MetaWindowActor *self)
 {
   MetaWindowActorPrivate *priv = self->priv;
-  meta_surface_actor_freeze (priv->surface);
+
+  if (priv->freeze_count == 0)
+    meta_surface_actor_set_frozen (priv->surface, TRUE);
+
+  priv->freeze_count ++;
 }
 
 static void
@@ -284,11 +290,15 @@ meta_window_actor_thaw (MetaWindowActor *self)
 {
   MetaWindowActorPrivate *priv = self->priv;
 
-  meta_surface_actor_thaw (priv->surface);
+  if (priv->freeze_count <= 0)
+    g_error ("Error in freeze/thaw accounting");
 
-  if (is_frozen (self))
+  priv->freeze_count--;
+  if (priv->freeze_count > 0)
     return;
 
+  meta_surface_actor_set_frozen (priv->surface, FALSE);
+
   /* We sometimes ignore moves and resizes on frozen windows */
   meta_window_actor_sync_actor_geometry (self, FALSE);
 
@@ -326,8 +336,7 @@ set_surface (MetaWindowActor  *self,
 
       /* If the previous surface actor was frozen, start out
        * frozen as well... */
-      if (priv->updates_frozen)
-        meta_surface_actor_freeze (priv->surface);
+      meta_surface_actor_set_frozen (priv->surface, priv->freeze_count > 0);
 
       meta_window_actor_update_shape (self);
     }