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
  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_