[mutter/wip/surface-content: 3/10] surface-actor: Move unobscured_region processing here

[Jasper St. Pierre <jstpierre src gnome org>]

commit 82666fd7469a3106668bfd583084cd4d6ddad14b
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Dec 6 11:57:40 2013 -0500

    surface-actor: Move unobscured_region processing here
    
    https://bugzilla.gnome.org/show_bug.cgi?id=720631

 src/compositor/meta-surface-actor.c        |  105 ++++++++++++++++++++++++++--
 src/compositor/meta-surface-actor.h        |    9 +--
 src/compositor/meta-window-actor-private.h |    3 -
 src/compositor/meta-window-actor.c         |   70 +++---------------
 src/compositor/meta-window-group.c         |   14 ----
 src/wayland/meta-wayland-surface.c         |    6 +--
 6 files changed, 116 insertions(+), 91 deletions(-)
---
diff --git a/src/compositor/meta-surface-actor.c b/src/compositor/meta-surface-actor.c
index 37b87b0..8d3f5b4 100644
--- a/src/compositor/meta-surface-actor.c
+++ b/src/compositor/meta-surface-actor.c
@@ -24,6 +24,9 @@ struct _MetaSurfaceActorPrivate
 {
   MetaShapedTexture *texture;
   MetaWaylandBuffer *buffer;
+
+  /* The region that is visible, used to optimize out redraws */
+  cairo_region_t   *unobscured_region;
 };
 
 static void cullable_iface_init (MetaCullableInterface *iface);
@@ -31,23 +34,96 @@ static void cullable_iface_init (MetaCullableInterface *iface);
 G_DEFINE_TYPE_WITH_CODE (MetaSurfaceActor, meta_surface_actor, CLUTTER_TYPE_ACTOR,
                          G_IMPLEMENT_INTERFACE (META_TYPE_CULLABLE, cullable_iface_init));
 
+static gboolean
+meta_surface_actor_get_paint_volume (ClutterActor       *actor,
+                                     ClutterPaintVolume *volume)
+{
+  MetaSurfaceActor *self = META_SURFACE_ACTOR (actor);
+  MetaSurfaceActorPrivate *priv = self->priv;
+
+  if (!CLUTTER_ACTOR_CLASS (meta_surface_actor_parent_class)->get_paint_volume (actor, volume))
+    return FALSE;
+
+  if (priv->unobscured_region)
+    {
+      ClutterVertex origin;
+      cairo_rectangle_int_t bounds, unobscured_bounds;
+
+      /* I hate ClutterPaintVolume so much... */
+      clutter_paint_volume_get_origin (volume, &origin);
+      bounds.x = origin.x;
+      bounds.y = origin.y;
+      bounds.width = clutter_paint_volume_get_width (volume);
+      bounds.height = clutter_paint_volume_get_height (volume);
+
+      cairo_region_get_extents (priv->unobscured_region, &unobscured_bounds);
+      gdk_rectangle_intersect (&bounds, &unobscured_bounds, &bounds);
+
+      origin.x = bounds.x;
+      origin.y = bounds.y;
+      clutter_paint_volume_set_origin (volume, &origin);
+      clutter_paint_volume_set_width (volume, bounds.width);
+      clutter_paint_volume_set_height (volume, bounds.height);
+    }
+
+  return TRUE;
+}
+
+static void
+meta_surface_actor_dispose (GObject *object)
+{
+  MetaSurfaceActor *self = META_SURFACE_ACTOR (object);
+  MetaSurfaceActorPrivate *priv = self->priv;
+
+  g_clear_pointer (&priv->unobscured_region, cairo_region_destroy);
+
+  G_OBJECT_CLASS (meta_surface_actor_parent_class)->dispose (object);
+}
+
 static void
 meta_surface_actor_class_init (MetaSurfaceActorClass *klass)
 {
+  ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  actor_class->get_paint_volume = meta_surface_actor_get_paint_volume;
+  object_class->dispose = meta_surface_actor_dispose;
+
   g_type_class_add_private (klass, sizeof (MetaSurfaceActorPrivate));
 }
 
 static void
+set_unobscured_region (MetaSurfaceActor *self,
+                       cairo_region_t   *unobscured_region)
+{
+  MetaSurfaceActorPrivate *priv = self->priv;
+
+  if (priv->unobscured_region)
+    cairo_region_destroy (priv->unobscured_region);
+
+  if (unobscured_region)
+    priv->unobscured_region = cairo_region_copy (unobscured_region);
+  else
+    priv->unobscured_region = NULL;
+}
+
+static void
 meta_surface_actor_cull_out (MetaCullable   *cullable,
                              cairo_region_t *unobscured_region,
                              cairo_region_t *clip_region)
 {
+  MetaSurfaceActor *self = META_SURFACE_ACTOR (cullable);
+
+  set_unobscured_region (self, unobscured_region);
   meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
 }
 
 static void
 meta_surface_actor_reset_culling (MetaCullable *cullable)
 {
+  MetaSurfaceActor *self = META_SURFACE_ACTOR (cullable);
+
+  set_unobscured_region (self, NULL);
   meta_cullable_reset_culling_children (cullable);
 }
 
@@ -108,9 +184,16 @@ update_area (MetaSurfaceActor *self,
     }
 }
 
+static cairo_region_t *
+effective_unobscured_region (MetaSurfaceActor *self)
+{
+  MetaSurfaceActorPrivate *priv = self->priv;
+
+  return clutter_actor_has_mapped_clones (CLUTTER_ACTOR (self)) ? NULL : priv->unobscured_region;
+}
+
 gboolean
-meta_surface_actor_damage_all (MetaSurfaceActor *self,
-                               cairo_region_t   *unobscured_region)
+meta_surface_actor_damage_all (MetaSurfaceActor *self)
 {
   MetaSurfaceActorPrivate *priv = self->priv;
   CoglTexture *texture = meta_shaped_texture_get_texture (priv->texture);
@@ -120,7 +203,7 @@ meta_surface_actor_damage_all (MetaSurfaceActor *self,
                                           0, 0,
                                           cogl_texture_get_width (texture),
                                           cogl_texture_get_height (texture),
-                                          unobscured_region);
+                                          effective_unobscured_region (self));
 }
 
 gboolean
@@ -128,15 +211,25 @@ meta_surface_actor_damage_area (MetaSurfaceActor *self,
                                 int               x,
                                 int               y,
                                 int               width,
-                                int               height,
-                                cairo_region_t   *unobscured_region)
+                                int               height)
 {
   MetaSurfaceActorPrivate *priv = self->priv;
 
   update_area (self, x, y, width, height);
   return meta_shaped_texture_update_area (priv->texture,
                                           x, y, width, height,
-                                          unobscured_region);
+                                          effective_unobscured_region (self));
+}
+
+gboolean
+meta_surface_actor_is_obscured (MetaSurfaceActor *self)
+{
+  MetaSurfaceActorPrivate *priv = self->priv;
+
+  if (priv->unobscured_region)
+    return cairo_region_is_empty (priv->unobscured_region);
+  else
+    return FALSE;
 }
 
 void
diff --git a/src/compositor/meta-surface-actor.h b/src/compositor/meta-surface-actor.h
index 484877b..0f5fd8f 100644
--- a/src/compositor/meta-surface-actor.h
+++ b/src/compositor/meta-surface-actor.h
@@ -43,15 +43,14 @@ cairo_surface_t *meta_surface_actor_get_image (MetaSurfaceActor      *self,
 
 MetaShapedTexture *meta_surface_actor_get_texture (MetaSurfaceActor *self);
 
-gboolean meta_surface_actor_damage_all (MetaSurfaceActor *self,
-                                        cairo_region_t   *unobscured_region);
-
+gboolean meta_surface_actor_damage_all  (MetaSurfaceActor *self);
 gboolean meta_surface_actor_damage_area (MetaSurfaceActor *self,
                                          int               x,
                                          int               y,
                                          int               width,
-                                         int               height,
-                                         cairo_region_t   *unobscured_region);
+                                         int               height);
+
+gboolean meta_surface_actor_is_obscured (MetaSurfaceActor *self);
 
 void meta_surface_actor_set_texture (MetaSurfaceActor *self,
                                      CoglTexture      *texture);
diff --git a/src/compositor/meta-window-actor-private.h b/src/compositor/meta-window-actor-private.h
index 82326d2..e3d239d 100644
--- a/src/compositor/meta-window-actor-private.h
+++ b/src/compositor/meta-window-actor-private.h
@@ -59,9 +59,6 @@ void     meta_window_actor_set_updates_frozen  (MetaWindowActor *self,
 void     meta_window_actor_queue_frame_drawn   (MetaWindowActor *self,
                                                 gboolean         no_delay_frame);
 
-void meta_window_actor_set_unobscured_region      (MetaWindowActor *self,
-                                                   cairo_region_t  *unobscured_region);
-
 void meta_window_actor_effect_completed (MetaWindowActor *actor,
                                          gulong           event);
 
diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index e9cecfc..652ce04 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -72,9 +72,6 @@ struct _MetaWindowActorPrivate
   /* The region we should clip to when painting the shadow */
   cairo_region_t   *shadow_clip;
 
-  /* The region that is visible, used to optimize out redraws */
-  cairo_region_t   *unobscured_region;
-
   guint              send_frame_messages_timer;
   gint64             frame_drawn_time;
 
@@ -424,7 +421,6 @@ meta_window_actor_dispose (GObject *object)
       priv->send_frame_messages_timer = 0;
     }
 
-  g_clear_pointer (&priv->unobscured_region, cairo_region_destroy);
   g_clear_pointer (&priv->shape_region, cairo_region_destroy);
   g_clear_pointer (&priv->shadow_clip, cairo_region_destroy);
 
@@ -720,12 +716,15 @@ meta_window_actor_get_paint_volume (ClutterActor       *actor,
       gdk_rectangle_union (&bounds, &shadow_bounds, &bounds);
     }
 
-  if (priv->unobscured_region)
-    {
-      cairo_rectangle_int_t unobscured_bounds;
-      cairo_region_get_extents (priv->unobscured_region, &unobscured_bounds);
-      gdk_rectangle_intersect (&bounds, &unobscured_bounds, &bounds);
-    }
+  {
+    const ClutterPaintVolume *child_volume;
+
+    child_volume = clutter_actor_get_transformed_paint_volume (CLUTTER_ACTOR (priv->surface), actor);
+    if (!child_volume)
+      return FALSE;
+
+    clutter_paint_volume_union (volume, child_volume);
+  }
 
   origin.x = bounds.x;
   origin.y = bounds.y;
@@ -977,7 +976,6 @@ static void
 meta_window_actor_damage_all (MetaWindowActor *self)
 {
   MetaWindowActorPrivate *priv = self->priv;
-  cairo_region_t *unobscured_region;
   gboolean redraw_queued;
 
   if (!priv->needs_damage_all)
@@ -986,11 +984,7 @@ meta_window_actor_damage_all (MetaWindowActor *self)
   if (priv->needs_pixmap)
     return;
 
-  unobscured_region =
-    clutter_actor_has_mapped_clones (CLUTTER_ACTOR (priv->surface))
-    ? NULL : priv->unobscured_region;
-
-  redraw_queued = meta_surface_actor_damage_all (priv->surface, unobscured_region);
+  redraw_queued = meta_surface_actor_damage_all (priv->surface);
 
   priv->repaint_scheduled = priv->repaint_scheduled || redraw_queued;
   priv->needs_damage_all = FALSE;
@@ -1049,17 +1043,7 @@ meta_window_actor_queue_frame_drawn (MetaWindowActor *self,
 
   if (!priv->repaint_scheduled)
     {
-      gboolean is_obscured = FALSE;
-
-      /* Find out whether the window is completly obscured */
-      if (priv->unobscured_region)
-        {
-          cairo_region_t *unobscured_window_region;
-          unobscured_window_region = cairo_region_copy (priv->shape_region);
-          cairo_region_intersect (unobscured_window_region, priv->unobscured_region);
-          is_obscured = cairo_region_is_empty (unobscured_window_region);
-          cairo_region_destroy (unobscured_window_region);
-        }
+      gboolean is_obscured = meta_surface_actor_is_obscured (priv->surface);
 
       /* A frame was marked by the client without actually doing any
        * damage or any unobscured, or while we had the window frozen
@@ -1704,30 +1688,6 @@ see_region (cairo_region_t *region,
 #endif
 
 /**
- * meta_window_actor_set_unobscured_region:
- * @self: a #MetaWindowActor
- * @unobscured_region: the region of the screen that isn't completely
- *  obscured.
- *
- * Provides a hint as to what areas of the window need to queue
- * redraws when damaged. Regions not in @unobscured_region are completely obscured.
- */
-void
-meta_window_actor_set_unobscured_region (MetaWindowActor *self,
-                                         cairo_region_t  *unobscured_region)
-{
-  MetaWindowActorPrivate *priv = self->priv;
-
-  if (priv->unobscured_region)
-    cairo_region_destroy (priv->unobscured_region);
-
-  if (unobscured_region)
-    priv->unobscured_region = cairo_region_copy (unobscured_region);
-  else
-    priv->unobscured_region = NULL;
-}
-
-/**
  * meta_window_actor_set_clip_region_beneath:
  * @self: a #MetaWindowActor
  * @clip_region: the region of the screen that isn't completely
@@ -1775,7 +1735,6 @@ meta_window_actor_cull_out (MetaCullable   *cullable,
         return;
     }
 
-  meta_window_actor_set_unobscured_region (self, unobscured_region);
   meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
   meta_window_actor_set_clip_region_beneath (self, clip_region);
 }
@@ -1946,7 +1905,6 @@ meta_window_actor_process_x11_damage (MetaWindowActor    *self,
   MetaWindowActorPrivate *priv = self->priv;
   MetaCompScreen *info = meta_screen_get_compositor_data (priv->screen);
   gboolean redraw_queued;
-  cairo_region_t *unobscured_region;
 
   priv->received_x11_damage = TRUE;
 
@@ -1994,15 +1952,11 @@ meta_window_actor_process_x11_damage (MetaWindowActor    *self,
   if (priv->needs_pixmap)
     return;
 
-  unobscured_region =
-    clutter_actor_has_mapped_clones (CLUTTER_ACTOR (priv->surface))
-    ? NULL : priv->unobscured_region;
   redraw_queued = meta_surface_actor_damage_area (priv->surface,
                                                   event->area.x,
                                                   event->area.y,
                                                   event->area.width,
-                                                  event->area.height,
-                                                  unobscured_region);
+                                                  event->area.height);
 
   priv->repaint_scheduled = priv->repaint_scheduled  || redraw_queued;
 
diff --git a/src/compositor/meta-window-group.c b/src/compositor/meta-window-group.c
index 9554571..1144554 100644
--- a/src/compositor/meta-window-group.c
+++ b/src/compositor/meta-window-group.c
@@ -115,8 +115,6 @@ meta_window_group_paint (ClutterActor *actor)
 {
   cairo_region_t *clip_region;
   cairo_region_t *unobscured_region;
-  ClutterActorIter iter;
-  ClutterActor *child;
   cairo_rectangle_int_t visible_rect, clip_rect;
   int paint_x_offset, paint_y_offset;
   int paint_x_origin, paint_y_origin;
@@ -125,18 +123,6 @@ meta_window_group_paint (ClutterActor *actor)
   MetaWindowGroup *window_group = META_WINDOW_GROUP (actor);
   ClutterActor *stage = clutter_actor_get_stage (actor);
 
-  /* Start off by treating all windows as completely unobscured, so damage anywhere
-   * in a window queues redraws, but confine it more below. */
-  clutter_actor_iter_init (&iter, actor);
-  while (clutter_actor_iter_next (&iter, &child))
-    {
-      if (META_IS_WINDOW_ACTOR (child))
-        {
-          MetaWindowActor *window_actor = META_WINDOW_ACTOR (child);
-          meta_window_actor_set_unobscured_region (window_actor, NULL);
-        }
-    }
-
   /* Normally we expect an actor to be drawn at it's position on the screen.
    * However, if we're inside the paint of a ClutterClone, that won't be the
    * case and we need to compensate. We look at the position of the window
diff --git a/src/wayland/meta-wayland-surface.c b/src/wayland/meta-wayland-surface.c
index 1ca38e5..f31f3ce 100644
--- a/src/wayland/meta-wayland-surface.c
+++ b/src/wayland/meta-wayland-surface.c
@@ -69,11 +69,7 @@ surface_process_damage (MetaWaylandSurface *surface,
       cairo_rectangle_int_t rect;
       cairo_region_get_rectangle (region, i, &rect);
       meta_surface_actor_damage_area (surface->surface_actor,
-                                      rect.x,
-                                      rect.y,
-                                      rect.width,
-                                      rect.height,
-                                      NULL);
+                                      rect.x, rect.y, rect.width, rect.height);
     }
 }