Implement the logic to kick off image decoding jobs for TileManager

cc/tile_manager.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_TILE_MANAGER_H_
 #define CC_TILE_MANAGER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 39 matching lines @@
   bool can_use_gpu_memory;
   bool can_be_freed;
   scoped_ptr<ResourcePool::Resource> resource;
   bool resource_is_being_initialized;
   bool contents_swizzled;
 
   // Ephemeral state, valid only during Manage.
   TileManagerBin bin;
   TileResolution resolution;
   float time_to_needed_in_seconds;
+  bool has_image_decoding_info;
+  std::vector<SkPixelRef*> pending_pixel_refs;

[reveman, 2012/12/10 17:58:12]

Should these be in the persistent state group above?

[qinmin, 2012/12/10 22:52:51]

Done.

 };
 
 // This class manages tiles, deciding which should get rasterized and which
 // should no longer have any memory assigned to them. Tile objects are "owned"
 // by layers; they automatically register with the manager when they are
 // created, and unregister from the manager when they are deleted.
 class CC_EXPORT TileManager {
  public:
   TileManager(TileManagerClient* client,
               ResourceProvider *resource_provider,
@@ skipping 19 matching lines @@
   void FreeResourcesForTile(Tile*);
   void ScheduleManageTiles();
   void DispatchMoreRasterTasks();
   void DispatchOneRasterTask(RasterThread*, scoped_refptr<Tile>);
   void OnRasterTaskCompleted(
       scoped_refptr<Tile>,
       scoped_ptr<ResourcePool::Resource>,
       scoped_refptr<PicturePileImpl>,
       RenderingStats*);
   void DidFinishTileInitialization(Tile*, scoped_ptr<ResourcePool::Resource>);
+  bool HasDispatchedImageDecodingTasks(Tile*);
+  void OnImageDecodingTaskCompleted(scoped_refptr<Tile>, uint32_t);
+  void DispatchOneImageDecodingTask(
+      RasterThread*, scoped_refptr<Tile>, SkPixelRef*);
+  void GetImageInformationForTile(Tile*);
+  RasterThread* GetFreeRasterThread();
 
   TileManagerClient* client_;
   scoped_ptr<ResourcePool> resource_pool_;
   bool manage_tiles_pending_;
 
   GlobalStateThatImpactsTilePriority global_state_;
 
   typedef std::vector<Tile*> TileVector;
   TileVector tiles_;
   TileVector tiles_that_need_to_be_rasterized_;
+  // Tiles that are waiting for image decoding tasks.
+  TileVector tiles_waiting_for_image_decoding_;
+
+  typedef base::hash_map<uint32_t, SkPixelRef*> PixelRefMap;
+  PixelRefMap pending_decode_tasks_;
 
   typedef ScopedPtrVector<RasterThread> RasterThreadVector;
   RasterThreadVector raster_threads_;
 
   RenderingStats rendering_stats_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_MANAGER_H_