Aggregate damage rects in surface aggregator

cc/surfaces/surface_aggregator.h

 // Copyright 2014 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_SURFACES_SURFACE_AGGREGATOR_H_
 #define CC_SURFACES_SURFACE_AGGREGATOR_H_
 
 #include <set>
 
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/quads/render_pass.h"
 #include "cc/resources/transferable_resource.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surfaces_export.h"
 
 namespace cc {
 
 class CompositorFrame;
 class DelegatedFrameData;
 class ResourceProvider;
 class Surface;
 class SurfaceDrawQuad;
 class SurfaceManager;
 
 class CC_SURFACES_EXPORT SurfaceAggregator {
  public:
+  typedef base::hash_map<SurfaceId, int> SurfaceIndexMap;
+
   SurfaceAggregator(SurfaceManager* manager, ResourceProvider* provider);
   ~SurfaceAggregator();
 
-  scoped_ptr<CompositorFrame> Aggregate(
-      SurfaceId surface_id,
-      std::set<SurfaceId>* contained_surfaces);
+  scoped_ptr<CompositorFrame> Aggregate(SurfaceId surface_id);
+  SurfaceIndexMap& previous_contained_surfaces() {
+    return previous_contained_surfaces_;
+  }
 
  private:
   RenderPassId RemapPassId(RenderPassId surface_local_pass_id,
                            SurfaceId surface_id);
 
   void HandleSurfaceQuad(const SurfaceDrawQuad* surface_quad,
                          RenderPass* dest_pass);
   void CopySharedQuadState(const SharedQuadState* source_sqs,
                            const gfx::Transform& content_to_target_transform,
                            RenderPass* dest_render_pass);
   void CopyQuadsToPass(const QuadList& source_quad_list,
                        const SharedQuadStateList& source_shared_quad_state_list,
                        const gfx::Transform& content_to_target_transform,
                        RenderPass* dest_pass,
                        SurfaceId surface_id);
-  void CopyPasses(const RenderPassList& source_pass_list, SurfaceId surface_id);
+  void CopyPasses(const RenderPassList& source_pass_list,
+                  const Surface* surface);
 
   bool TakeResources(Surface* surface,
                      const DelegatedFrameData* frame_data,
                      RenderPassList* render_pass_list);
   int ChildIdForSurface(Surface* surface);
+  gfx::Rect DamageRectForSurface(const Surface* surface,
+                                 const RenderPass& source);
 
   SurfaceManager* manager_;
   ResourceProvider* provider_;
 
   class RenderPassIdAllocator;
   typedef base::ScopedPtrHashMap<SurfaceId, RenderPassIdAllocator>
       RenderPassIdAllocatorMap;
   RenderPassIdAllocatorMap render_pass_allocator_map_;
 
   typedef base::hash_map<SurfaceId, int> SurfaceToResourceChildIdMap;
   SurfaceToResourceChildIdMap surface_id_to_resource_child_id_;
 
   // The following state is only valid for the duration of one Aggregate call
   // and is only stored on the class to avoid having to pass through every
   // function call.
 
   // This is the set of surfaces referenced in the aggregation so far, used to
   // detect cycles.
   typedef std::set<SurfaceId> SurfaceSet;
   SurfaceSet referenced_surfaces_;
 
-  // This is the set of surfaces that were used in the last draw.
-  SurfaceSet* contained_surfaces_;
+  // For each Surface used in the last aggregation, gives the frame_index at
+  // that time.
+  SurfaceIndexMap previous_contained_surfaces_;
+  SurfaceIndexMap contained_surfaces_;
 
   // This is the pass list for the aggregated frame.
   RenderPassList* dest_pass_list_;
 
   // Resource list for the aggregated frame.
   TransferableResourceArray* dest_resource_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceAggregator);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_AGGREGATOR_H_