cc: Added tile bundles

cc/resources/tile_bundle.h

Index: cc/resources/tile_bundle.h
diff --git a/cc/resources/tile_bundle.h b/cc/resources/tile_bundle.h
new file mode 100644
index 0000000000000000000000000000000000000000..e194e7bee10ce9f820a9556157596bdf1ec9be3c
--- /dev/null
+++ b/cc/resources/tile_bundle.h
@@ -0,0 +1,119 @@
+// 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_TILE_BUNDLE_H_
+#define CC_RESOURCES_TILE_BUNDLE_H_
+
+#include <utility>
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "cc/base/ref_counted_managed.h"
+#include "cc/resources/tile_priority.h"
+
+namespace cc {
+
+class TileManager;
+class Tile;
+class PictureLayerTiling;
+class CC_EXPORT TileBundle : public RefCountedManaged<TileBundle> {
+ public:
+  typedef uint64 Id;
+  typedef std::vector<scoped_refptr<Tile> > TileVector;
+  typedef std::vector<TileVector> TileGrid;
+
+  inline Id id() const { return id_; }
+
+  Tile* TileAt(WhichTree tree, int index_x, int index_y);
+  bool RemoveTileAt(WhichTree tree, int index_x, int index_y);
+  void AddTileAt(WhichTree tree,
+                 int index_x,
+                 int index_y,
+                 scoped_refptr<Tile> tile);
+  inline bool IsEmpty() const { return conservative_count_ == 0; }
+
+  void DidBecomeRecycled();
+  void DidBecomeActive();
+
+  void SetPriority(WhichTree tree, const TilePriority& priority);
+  TilePriority GetPriority(WhichTree tree) const;
+
+  void SwapTilesIfRequired();
+
+  class Iterator {
+   public:
+    explicit Iterator(TileBundle* bundle);
+    ~Iterator();
+
+    Iterator& operator++();
+
+    inline Tile* operator*() { return current_tile_; }
+    inline Tile* operator->() { return current_tile_; }
+    inline operator bool() const {
+      return index_y_ < bundle_->bundle_rect_.height();
+    }
+
+    inline int index_x() {
+      return index_x_ + bundle_->bundle_rect_.x();
+    }
+    inline int index_y() {
+      return index_y_ + bundle_->bundle_rect_.y();
+    }
+
+    TilePriority active_priority() const {
+      return priority_[ACTIVE_TREE] ? *priority_[ACTIVE_TREE]
+                                    : TilePriority();
+    }
+
+    TilePriority pending_priority() const {
+      return priority_[PENDING_TREE] ? *priority_[PENDING_TREE]
+                                     : TilePriority();
+    }
+
+    bool active_tree_only_tile() {
+      return active_tree_only_tile_;
+    }
+    bool pending_tree_only_tile() {
+      return pending_tree_only_tile_;
+    }
+
+   private:
+    bool InitializeNewTileForTree(WhichTree tree);
+
+    TileBundle* bundle_;
+    Tile* current_tile_;
+    TilePriority* priority_[NUM_TREES];
+    int index_x_;
+    int index_y_;
+    WhichTree current_tree_;
+    bool active_tree_only_tile_;
+    bool pending_tree_only_tile_;
+  };
+
+ private:
+  friend class TileManager;
+  friend class Iterator;
+
+  TileBundle(TileManager* tile_manager, gfx::Rect bundle_rect);
+  ~TileBundle();
+
+  void UpdateToLocalIndex(int* index_x, int* index_y);
+  Tile* TileAtLocalIndex(WhichTree tree, int x, int y);
+
+  TileManager* tile_manager_;
+
+  TileGrid tiles_[NUM_TREES];
+  gfx::Rect bundle_rect_;
+
+  TilePriority priority_[NUM_TREES];
+  size_t conservative_count_;
+  bool needs_tile_swap_;
+
+  Id id_;
+  static Id s_next_id_;
+};
+
+}  // namespace cc
+
+#endif  // CC_RESOURCES_TILE_BUNDLE_H_