Preliminary compositor disabling patch.

cc/trees/damage_tracker.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_DAMAGE_TRACKER_H_
 #define CC_TREES_DAMAGE_TRACKER_H_
 
 #include <vector>
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 13 matching lines @@
 class RenderSurfaceImpl;
 
 // Computes the region where pixels have actually changed on a
 // RenderSurfaceImpl. This region is used to scissor what is actually drawn to
 // the screen to save GPU computation and bandwidth.
 class CC_EXPORT DamageTracker {
  public:
   static scoped_ptr<DamageTracker> Create();
   ~DamageTracker();
 
-  void DidDrawDamagedArea() { current_damage_rect_ = gfx::Rect(); }
+  void DidDrawDamagedArea() {
+    current_damage_rect_ = gfx::Rect();
+    current_overlay_rect_ = gfx::Rect();
+  }
   void AddDamageNextUpdate(const gfx::Rect& dmg) {
     current_damage_rect_.Union(dmg);
   }
   void UpdateDamageTrackingState(
       const LayerImplList& layer_list,
       int target_surface_layer_id,
       bool target_surface_property_changed_only_from_descendant,
       const gfx::Rect& target_surface_content_rect,
       LayerImpl* target_surface_mask_layer,
       const FilterOperations& filters);
 
   gfx::Rect current_damage_rect() { return current_damage_rect_; }
+  gfx::Rect current_overlay_rect() { return current_overlay_rect_; }
 
  private:
   DamageTracker();
 
-  gfx::Rect TrackDamageFromActiveLayers(const LayerImplList& layer_list,
-                                        int target_surface_layer_id);
+  void TrackDamageFromActiveLayers(const LayerImplList& layer_list,
+                                   int target_surface_layer_id,
+                                   gfx::Rect* damage,
+                                   gfx::Rect* overlay);
   gfx::Rect TrackDamageFromSurfaceMask(LayerImpl* target_surface_mask_layer);
   gfx::Rect TrackDamageFromLeftoverRects();
 
   void PrepareRectHistoryForUpdate();
 
   // These helper functions are used only in TrackDamageFromActiveLayers().
-  void ExtendDamageForLayer(LayerImpl* layer, gfx::Rect* target_damage_rect);
+  void ExtendDamageForLayer(LayerImpl* layer,
+                            gfx::Rect* target_damage_rect,
+                            gfx::Rect* target_overlay_rect);
   void ExtendDamageForRenderSurface(LayerImpl* layer,
                                     gfx::Rect* target_damage_rect);
 
   struct RectMapData {
     RectMapData() : layer_id_(0), mailboxId_(0) {}
     explicit RectMapData(int layer_id) : layer_id_(layer_id), mailboxId_(0) {}
     void Update(const gfx::Rect& rect, unsigned int mailboxId) {
       mailboxId_ = mailboxId;
       rect_ = rect;
     }
 
     bool operator < (const RectMapData& other) const {
       return layer_id_ < other.layer_id_;
     }
 
     int layer_id_;
     unsigned int mailboxId_;
     gfx::Rect rect_;
   };
   typedef std::vector<RectMapData> SortedRectMap;
 
   RectMapData& RectDataForLayer(int layer_id, bool* layer_is_new);
 
   SortedRectMap rect_history_;
 
   unsigned int mailboxId_;
   gfx::Rect current_damage_rect_;
+  gfx::Rect current_overlay_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(DamageTracker);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_DAMAGE_TRACKER_H_