surface_resource_holder.h revision 116680a4aac90f2aa7413d9095a592090648e557 
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
14namespace cc {
15class 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.
21class 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_
52