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| 1 // Copyright 2014 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_SURFACES_SURFACE_RESOURCE_HOLDER_H_ | |
| 6 #define CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_ | |
| 7 | |
| 8 #include "base/containers/hash_tables.h" | |
| 9 #include "base/macros.h" | |
| 10 #include "cc/resources/resource_provider.h" | |
| 11 #include "cc/resources/returned_resource.h" | |
| 12 #include "cc/surfaces/surfaces_export.h" | |
| 13 | |
| 14 namespace cc { | |
| 15 class SurfaceFactoryClient; | |
| 16 | |
| 17 // A SurfaceResourceHolder manages the lifetime of resources submitted by a | |
| 18 // particular SurfaceFactory. Each resource is held by the service until | |
| 19 // it is no longer referenced by any pending frames or by any | |
| 20 // resource providers. | |
| 21 class CC_SURFACES_EXPORT SurfaceResourceHolder { | |
| 22 public: | |
| 23 explicit SurfaceResourceHolder(SurfaceFactoryClient* client); | |
| 24 ~SurfaceResourceHolder(); | |
| 25 | |
| 26 void ReceiveFromChild(const TransferableResourceArray& resources); | |
| 27 void RefResources(const TransferableResourceArray& resources); | |
| 28 void UnrefResources(const ReturnedResourceArray& resources); | |
| 29 | |
| 30 private: | |
| 31 SurfaceFactoryClient* client_; | |
| 32 | |
| 33 struct ResourceRefs { | |
| 34 ResourceRefs(); | |
| 35 | |
| 36 int refs_received_from_child; | |
| 37 int refs_holding_resource_alive; | |
| 38 }; | |
| 39 // Keeps track of the number of users currently in flight for each resource | |
| 40 // ID we've received from the client. When this counter hits zero for a | |
| 41 // particular resource, that ID is available to return to the client. | |
| 42 typedef base::hash_map<ResourceProvider::ResourceId, ResourceRefs> | |
| 43 ResourceIdCountMap; | |
| 44 ResourceIdCountMap resource_id_use_count_map_; | |
| 45 | |
| 46 DISALLOW_COPY_AND_ASSIGN(SurfaceResourceHolder); | |
| 47 }; | |
| 48 | |
| 49 } // namespace cc | |
| 50 | |
| 51 #endif // CC_SURFACES_SURFACE_RESOURCE_HOLDER_H_ | |
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