Initial surface aggregator implementation

cc/surfaces/surface_aggregator.h

Index: cc/surfaces/surface_aggregator.h
diff --git a/cc/surfaces/surface_aggregator.h b/cc/surfaces/surface_aggregator.h
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+// 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/scoped_ptr_hash_map.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/quads/render_pass.h"
+#include "cc/surfaces/surfaces_export.h"
+
+namespace cc {
+
+class CompositorFrame;
+class DelegatedFrameData;
+class SurfaceDrawQuad;
+class SurfaceManager;
+
+class CC_SURFACES_EXPORT SurfaceAggregator {
+ public:
+  explicit SurfaceAggregator(SurfaceManager* manager);
+  ~SurfaceAggregator();
+
+  scoped_ptr<CompositorFrame> Aggregate(int surface_id);
+
+ private:
+  DelegatedFrameData* GetReferencedDataForSurfaceID(int surface_id);
+  RenderPass::Id RemapPassId(RenderPass::Id surface_local_pass_id,
+                             int surface_id);
+
+  void HandleSurfaceQuad(const SurfaceDrawQuad* surface_quad,
+                         RenderPass* dest_pass);
+  void CopyQuadsToPass(const QuadList& source_quad_list,
+                       const SharedQuadStateList& source_shared_quad_state_list,
+                       RenderPass* dest_pass,
+                       int surface_id);
+  void CopyPasses(const RenderPassList& source_pass_list, int surface_id);
+
+  SurfaceManager* manager_;
+
+  class RenderPassIdAllocator;
+  typedef base::ScopedPtrHashMap<int, RenderPassIdAllocator>
+      RenderPassIdAllocatorMap;
+  RenderPassIdAllocatorMap render_pass_allocator_map_;
+
+  // 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.
+  std::set<int> referenced_surfaces_;
+
+  // This is the pass list for the aggregated frame.
+  RenderPassList* dest_pass_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(SurfaceAggregator);
+};
+
+}  // namespace cc
+
+#endif  // CC_SURFACES_SURFACE_AGGREGATOR_H_