cc: Optimize picture layer tiling raster tile iterator.

cc/resources/picture_layer_tiling.h

 // Copyright 2012 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_LAYER_TILING_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 43 matching lines @@
     TilingRasterTileIterator(PictureLayerTiling* tiling, WhichTree tree);
     ~TilingRasterTileIterator();
 
     operator bool() const { return !!current_tile_; }
     const Tile* operator*() const { return current_tile_; }
     Tile* operator*() { return current_tile_; }
     TilePriority::PriorityBin get_type() const { return type_; }
 
     TilingRasterTileIterator& operator++();
 
-    gfx::Rect TileBounds() const {
-      DCHECK(*this);
-      if (type_ == TilePriority::NOW) {
-        return tiling_->tiling_data_.TileBounds(visible_iterator_.index_x(),
-                                                visible_iterator_.index_y());
-      }
-      return tiling_->tiling_data_.TileBounds(spiral_iterator_.index_x(),
-                                              spiral_iterator_.index_y());
-    }
-
    private:
     void AdvancePhase();
     bool TileNeedsRaster(Tile* tile) const {
       RasterMode mode = tile->DetermineRasterModeForTree(tree_);
       return tile->NeedsRasterForMode(mode);
     }
 
     PictureLayerTiling* tiling_;
 
     TilePriority::PriorityBin type_;
-    gfx::Rect visible_rect_in_content_space_;
-    gfx::Rect skewport_in_content_space_;
-    gfx::Rect eventually_rect_in_content_space_;
-    gfx::Rect soon_border_rect_in_content_space_;
     WhichTree tree_;
 
     Tile* current_tile_;
     TilingData::Iterator visible_iterator_;
     TilingData::SpiralDifferenceIterator spiral_iterator_;
     bool skewport_processed_;
   };
 
   class CC_EXPORT TilingEvictionTileIterator {
    public:
@@ skipping 201 matching lines @@
   // State saved for computing velocities based upon finite differences.
   double last_impl_frame_time_in_seconds_;
   gfx::Rect last_visible_rect_in_content_space_;
 
   // Iteration rects in content space
   gfx::Rect current_visible_rect_;
   gfx::Rect current_skewport_rect_;
   gfx::Rect current_soon_border_rect_;
   gfx::Rect current_eventually_rect_;
 
+  bool has_visible_rect_tiles_;
+  bool has_skewport_rect_tiles_;
+  bool has_soon_border_rect_tiles_;
+  bool has_eventually_rect_tiles_;
+
   std::vector<Tile*> eviction_tiles_cache_;
   bool eviction_tiles_cache_valid_;
   TreePriority eviction_cache_tree_priority_;
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 
   RectExpansionCache expansion_cache_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_