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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 
     19 class CC_EXPORT DelegatedFrameResourceCollectionClient {
     20  public:
     21   // Called to inform the client that returned resources can be
     22   // grabbed off the DelegatedFrameResourceCollection.
     23   virtual void UnusedResourcesAreAvailable() = 0;
     24 };
     25 
     26 class CC_EXPORT DelegatedFrameResourceCollection
     27     : public base::RefCounted<DelegatedFrameResourceCollection> {
     28  public:
     29   DelegatedFrameResourceCollection();
     30 
     31   void SetClient(DelegatedFrameResourceCollectionClient* client);
     32 
     33   void TakeUnusedResourcesForChildCompositor(ReturnedResourceArray* array);
     34 
     35   // Considers all resources as lost, and returns true if it held any resource
     36   // to lose.
     37   bool LoseAllResources();
     38 
     39   // Methods for DelegatedFrameProvider.
     40   void RefResources(const TransferableResourceArray& resources);
     41   void UnrefResources(const ReturnedResourceArray& returned);
     42   void ReceivedResources(const TransferableResourceArray& resources);
     43   ReturnCallback GetReturnResourcesCallbackForImplThread();
     44 
     45  private:
     46   friend class base::RefCounted<DelegatedFrameResourceCollection>;
     47   ~DelegatedFrameResourceCollection();
     48 
     49   DelegatedFrameResourceCollectionClient* client_;
     50 
     51   ReturnedResourceArray returned_resources_for_child_compositor_;
     52   bool lost_all_resources_;
     53 
     54   struct RefCount {
     55     int refs_to_return;
     56     int refs_to_wait_for;
     57   };
     58   typedef base::hash_map<unsigned, RefCount> ResourceIdRefCountMap;
     59   ResourceIdRefCountMap resource_id_ref_count_map_;
     60 
     61   base::ThreadChecker main_thread_checker_;
     62   base::WeakPtrFactory<DelegatedFrameResourceCollection> weak_ptr_factory_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameResourceCollection);
     65 };
     66 
     67 }  // namespace cc
     68 
     69 #endif  // CC_LAYERS_DELEGATED_FRAME_RESOURCE_COLLECTION_H_
     70