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      1 // Copyright 2013 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_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
      6 #define CC_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
      7 
      8 #include "base/containers/hash_tables.h"
      9 #include "base/memory/ref_counted.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "base/threading/thread_checker.h"
     12 #include "cc/base/cc_export.h"
     13 #include "cc/resources/return_callback.h"
     14 #include "cc/resources/returned_resource.h"
     15 #include "cc/resources/transferable_resource.h"
     16 
     17 namespace cc {
     18 class BlockingTaskRunner;
     19 
     20 class CC_EXPORT DelegatedFrameResourceCollectionClient {
     21  public:
     22   // Called to inform the client that returned resources can be
     23   // grabbed off the DelegatedFrameResourceCollection.
     24   virtual void UnusedResourcesAreAvailable() = 0;
     25 };
     26 
     27 class CC_EXPORT DelegatedFrameResourceCollection
     28     : public base::RefCounted<DelegatedFrameResourceCollection> {
     29  public:
     30   DelegatedFrameResourceCollection();
     31 
     32   void SetClient(DelegatedFrameResourceCollectionClient* client);
     33 
     34   void TakeUnusedResourcesForChildCompositor(ReturnedResourceArray* array);
     35 
     36   // Considers all resources as lost, and returns true if it held any resource
     37   // to lose.
     38   bool LoseAllResources();
     39 
     40   // Methods for DelegatedFrameProvider.
     41   void RefResources(const TransferableResourceArray& resources);
     42   void UnrefResources(const ReturnedResourceArray& returned);
     43   void ReceivedResources(const TransferableResourceArray& resources);
     44   ReturnCallback GetReturnResourcesCallbackForImplThread();
     45 
     46  private:
     47   friend class base::RefCounted<DelegatedFrameResourceCollection>;
     48   ~DelegatedFrameResourceCollection();
     49 
     50   DelegatedFrameResourceCollectionClient* client_;
     51   scoped_refptr<BlockingTaskRunner> main_thread_runner_;
     52 
     53   ReturnedResourceArray returned_resources_for_child_compositor_;
     54   bool lost_all_resources_;
     55 
     56   struct RefCount {
     57     int refs_to_return;
     58     int refs_to_wait_for;
     59   };
     60   typedef base::hash_map<unsigned, RefCount> ResourceIdRefCountMap;
     61   ResourceIdRefCountMap resource_id_ref_count_map_;
     62 
     63   base::ThreadChecker main_thread_checker_;
     64   base::WeakPtrFactory<DelegatedFrameResourceCollection> weak_ptr_factory_;
     65 
     66   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameResourceCollection);
     67 };
     68 
     69 }  // namespace cc
     70 
     71 #endif  // CC_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
     72