cc: Replace recorded region with direct map lookup

cc/resources/picture_pile_base.h

 // Copyright 2013 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_RESOURCES_PICTURE_PILE_BASE_H_
 #define CC_RESOURCES_PICTURE_PILE_BASE_H_
 
 #include <bitset>
 #include <list>
 #include <utility>
@@ skipping 15 matching lines @@
 class CC_EXPORT PicturePileBase : public base::RefCounted<PicturePileBase> {
  public:
   PicturePileBase();
   explicit PicturePileBase(const PicturePileBase* other);
   PicturePileBase(const PicturePileBase* other, unsigned thread_index);
 
   void Resize(const gfx::Size& size);
   gfx::Size size() const { return tiling_.total_size(); }
   void SetMinContentsScale(float min_contents_scale);
 
-  void UpdateRecordedRegion();
-  const Region& recorded_region() const { return recorded_region_; }
-
   int num_tiles_x() const { return tiling_.num_tiles_x(); }
   int num_tiles_y() const { return tiling_.num_tiles_y(); }
   gfx::Rect tile_bounds(int x, int y) const { return tiling_.TileBounds(x, y); }
   bool HasRecordingAt(int x, int y);
   bool CanRaster(float contents_scale, const gfx::Rect& content_rect);
 
+  // If this pile contains any valid recordings. May have false positives.
+  bool HasRecordings() const { return has_any_recordings_; }
+
   static void ComputeTileGridInfo(const gfx::Size& tile_grid_size,
                                   SkTileGridPicture::TileGridInfo* info);
 
   void SetTileGridSize(const gfx::Size& tile_grid_size);
   TilingData& tiling() { return tiling_; }
 
   scoped_ptr<base::Value> AsValue() const;
 
  protected:
   class CC_EXPORT PictureInfo {
@@ skipping 22 matching lines @@
     int last_frame_number_;
     scoped_refptr<Picture> picture_;
     std::bitset<INVALIDATION_FRAMES_TRACKED> invalidation_history_;
   };
 
   typedef std::pair<int, int> PictureMapKey;
   typedef base::hash_map<PictureMapKey, PictureInfo> PictureMap;
 
   virtual ~PicturePileBase();
 
-  void SetRecordedRegionForTesting(const Region& recorded_region) {
-    recorded_region_ = recorded_region;
-  }
-
   int buffer_pixels() const { return tiling_.border_texels(); }
   void Clear();
 
   gfx::Rect PaddedRect(const PictureMapKey& key);
   gfx::Rect PadRect(const gfx::Rect& rect);
 
+  // An internal CanRaster check that goes to the picture_map rather than
+  // using the recorded_viewport hint.
+  bool CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const;
+
   // A picture pile is a tiled set of pictures. The picture map is a map of tile
   // indices to picture infos.
   PictureMap picture_map_;
   TilingData tiling_;
-  Region recorded_region_;
+  // If non-empty, all pictures tiles inside this rect are recorded.
+  gfx::Rect recorded_viewport_;
   float min_contents_scale_;
   SkTileGridPicture::TileGridInfo tile_grid_info_;
   SkColor background_color_;
   int slow_down_raster_scale_factor_for_debug_;
   bool contents_opaque_;
   bool show_debug_picture_borders_;
   bool clear_canvas_with_debug_color_;
+  // A hint about whether there are any recordings. This may be a false
+  // positive.
+  bool has_any_recordings_;
 
  private:
   void SetBufferPixels(int buffer_pixels);
 
   friend class base::RefCounted<PicturePileBase>;
   DISALLOW_COPY_AND_ASSIGN(PicturePileBase);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_BASE_H_