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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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