Use flat_set in SurfaceAggregator.

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 <map>
 #include <memory>
-#include <set>
-#include <unordered_map>
-#include <unordered_set>
 
+#include "base/containers/flat_map.h"
+#include "base/containers/flat_set.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/quads/draw_quad.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"
 #include "ui/gfx/color_space.h"
 
 namespace cc {
 
 class CompositorFrame;
 class ResourceProvider;
 class Surface;
 class SurfaceDrawQuad;
 class SurfaceManager;
 
 class CC_SURFACES_EXPORT SurfaceAggregator {
  public:
-  using SurfaceIndexMap = std::unordered_map<SurfaceId, int, SurfaceIdHash>;
+  using SurfaceIndexMap = base::flat_map<SurfaceId, int>;
 
   SurfaceAggregator(SurfaceManager* manager,
                     ResourceProvider* provider,
                     bool aggregate_only_damaged);
   ~SurfaceAggregator();
 
   CompositorFrame Aggregate(const SurfaceId& surface_id);
   void ReleaseResources(const SurfaceId& surface_id);
   SurfaceIndexMap& previous_contained_surfaces() {
     return previous_contained_surfaces_;
@@ skipping 14 matching lines @@
 
     bool is_clipped;
     gfx::Rect rect;
   };
 
   struct PrewalkResult {
     PrewalkResult();
     ~PrewalkResult();
     // This is the set of Surfaces that were referenced by another Surface, but
     // not included in a SurfaceDrawQuad.
-    std::set<SurfaceId> undrawn_surfaces;
+    base::flat_set<SurfaceId> undrawn_surfaces;
     bool may_contain_video = false;
   };
 
   struct RenderPassInfo {
     // This is the id the pass is mapped to.
     int id;
     // This is true if the pass was used in the last aggregated frame.
     bool in_use = true;
   };
 
@@ skipping 59 matching lines @@
                                  const RenderPass& source,
                                  const gfx::Rect& full_rect) const;
 
   SurfaceManager* manager_;
   ResourceProvider* provider_;
 
   // Every Surface has its own RenderPass ID namespace. This structure maps
   // each source (SurfaceId, RenderPass id) to a unified ID namespace that's
   // used in the aggregated frame. An entry is removed from the map if it's not
   // used for one output frame.
-  using RenderPassIdAllocatorMap =
-      std::map<std::pair<SurfaceId, int>, RenderPassInfo>;
-  RenderPassIdAllocatorMap render_pass_allocator_map_;
+  base::flat_map<std::pair<SurfaceId, int>, RenderPassInfo>
+      render_pass_allocator_map_;
   int next_render_pass_id_;
   const bool aggregate_only_damaged_;
   bool output_is_secure_;
 
   // The color space for the root render pass. If this is different from
   // |blending_color_space_|, then a final render pass to convert between
   // the two will be added.
   gfx::ColorSpace output_color_space_;
   // The color space in which blending is done, used for all non-root render
   // passes.
   gfx::ColorSpace blending_color_space_;
   // The id for the final color conversion render pass.
   int color_conversion_render_pass_id_ = 0;
 
-  using SurfaceToResourceChildIdMap =
-      std::unordered_map<SurfaceId, int, SurfaceIdHash>;
-  SurfaceToResourceChildIdMap surface_id_to_resource_child_id_;
+  base::flat_map<SurfaceId, int> 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.
-  using SurfaceSet = std::set<SurfaceId>;
-  SurfaceSet referenced_surfaces_;
+  base::flat_set<SurfaceId> referenced_surfaces_;
 
   // For each Surface used in the last aggregation, gives the frame_index at
   // that time.
   SurfaceIndexMap previous_contained_surfaces_;
   SurfaceIndexMap contained_surfaces_;
 
   // After surface validation, every Surface in this set is valid.
-  std::unordered_set<SurfaceId, SurfaceIdHash> valid_surfaces_;
+  base::flat_set<SurfaceId> valid_surfaces_;
 
   // This is the pass list for the aggregated frame.
   RenderPassList* dest_pass_list_;
 
   // This is the set of aggregated pass ids that are affected by filters that
   // move pixels.
-  std::unordered_set<int> moved_pixel_passes_;
+  base::flat_set<int> moved_pixel_passes_;
 
   // This is the set of aggregated pass ids that are drawn by copy requests, so
   // should not have their damage rects clipped to the root damage rect.
-  std::unordered_set<int> copy_request_passes_;
+  base::flat_set<int> copy_request_passes_;
 
   // This maps each aggregated pass id to the set of (aggregated) pass ids
   // that its RenderPassDrawQuads depend on
-  std::unordered_map<int, std::unordered_set<int>> render_pass_dependencies_;
+  base::flat_map<int, base::flat_set<int>> render_pass_dependencies_;
 
   // The root damage rect of the currently-aggregating frame.
   gfx::Rect root_damage_rect_;
 
   // True if the frame that's currently being aggregated has copy requests.
   // This is valid during Aggregate after PrewalkTree is called.
   bool has_copy_requests_;
 
   // Resource list for the aggregated frame.
   TransferableResourceArray* dest_resource_list_;
 
   // Tracks UMA stats for SurfaceDrawQuads during a call to Aggregate().
   SurfaceDrawQuadUmaStats uma_stats_;
 
   base::WeakPtrFactory<SurfaceAggregator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceAggregator);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_AGGREGATOR_H_