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      1 // Copyright 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CC_RESOURCES_RESOURCE_UPDATE_CONTROLLER_H_
      6 #define CC_RESOURCES_RESOURCE_UPDATE_CONTROLLER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "base/time/time.h"
     12 #include "cc/base/cc_export.h"
     13 #include "cc/resources/resource_update_queue.h"
     14 
     15 namespace base { class SingleThreadTaskRunner; }
     16 
     17 namespace cc {
     18 
     19 class ResourceProvider;
     20 
     21 class ResourceUpdateControllerClient {
     22  public:
     23   virtual void ReadyToFinalizeTextureUpdates() = 0;
     24 
     25  protected:
     26   virtual ~ResourceUpdateControllerClient() {}
     27 };
     28 
     29 class CC_EXPORT ResourceUpdateController {
     30  public:
     31   static scoped_ptr<ResourceUpdateController> Create(
     32       ResourceUpdateControllerClient* client,
     33       base::SingleThreadTaskRunner* task_runner,
     34       scoped_ptr<ResourceUpdateQueue> queue,
     35       ResourceProvider* resource_provider) {
     36     return make_scoped_ptr(new ResourceUpdateController(
     37         client, task_runner, queue.Pass(), resource_provider));
     38   }
     39   static size_t MaxPartialTextureUpdates();
     40 
     41   virtual ~ResourceUpdateController();
     42 
     43   // Discard uploads to textures that were evicted on the impl thread.
     44   void DiscardUploadsToEvictedResources();
     45 
     46   void PerformMoreUpdates(base::TimeTicks time_limit);
     47   void Finalize();
     48 
     49 
     50   // Virtual for testing.
     51   virtual size_t UpdateMoreTexturesSize() const;
     52   virtual base::TimeTicks UpdateMoreTexturesCompletionTime();
     53 
     54  protected:
     55   ResourceUpdateController(ResourceUpdateControllerClient* client,
     56                            base::SingleThreadTaskRunner* task_runner,
     57                            scoped_ptr<ResourceUpdateQueue> queue,
     58                            ResourceProvider* resource_provider);
     59 
     60  private:
     61   static size_t MaxFullUpdatesPerTick(ResourceProvider* resource_provider);
     62 
     63   size_t MaxBlockingUpdates() const;
     64 
     65   void UpdateTexture(ResourceUpdate update);
     66 
     67   // This returns true when there were textures left to update.
     68   bool UpdateMoreTexturesIfEnoughTimeRemaining();
     69   void UpdateMoreTexturesNow();
     70   void OnTimerFired();
     71 
     72   ResourceUpdateControllerClient* client_;
     73   scoped_ptr<ResourceUpdateQueue> queue_;
     74   bool contents_textures_purged_;
     75   ResourceProvider* resource_provider_;
     76   base::TimeTicks time_limit_;
     77   size_t texture_updates_per_tick_;
     78   bool first_update_attempt_;
     79   base::SingleThreadTaskRunner* task_runner_;
     80   bool task_posted_;
     81   base::WeakPtrFactory<ResourceUpdateController> weak_factory_;
     82 
     83   DISALLOW_COPY_AND_ASSIGN(ResourceUpdateController);
     84 };
     85 
     86 }  // namespace cc
     87 
     88 #endif  // CC_RESOURCES_RESOURCE_UPDATE_CONTROLLER_H_
     89