cc/layers/delegated_frame_resource_collection.h

   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_