1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
#define PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
#include <map>
#include "base/linked_ptr.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_stdint.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/pp_var.h"
template<typename T> struct DefaultSingletonTraits;
namespace pp {
namespace proxy {
class PluginDispatcher;
class PluginResource;
class PluginResourceTracker {
public:
// Returns the global singleton resource tracker for the plugin.
static PluginResourceTracker* GetInstance();
// Returns the object associated with the given resource ID, or NULL if
// there isn't one.
PluginResource* GetResourceObject(PP_Resource pp_resource);
void AddResource(PP_Resource pp_resource, linked_ptr<PluginResource> object);
void AddRefResource(PP_Resource resource);
void ReleaseResource(PP_Resource resource);
// Checks if the resource just returned from the renderer is already
// tracked by the plugin side and adjusts the refcounts if so.
//
// When the browser returns a PP_Resource, it could be a new one, in which
// case the proxy wants to create a corresponding object and call
// AddResource() on it. However, if the resouce is already known, then the
// refcount needs to be adjusted in both the plugin and the renderer side
// and no such object needs to be created.
//
// Returns true if the resource was previously known. The refcount will be
// fixed up such that it's ready to use by the plugin. A proxy can then
// just return the resource without doing any more work.
//
// Typical usage:
//
// PP_Resource result;
// dispatcher->Send(new MyMessage(..., &result));
// if (PluginResourceTracker::GetInstance()->
// PreparePreviouslyTrackedResource(result))
// return result;
// ... create resource object ...
// PluginResourceTracker::GetInstance()->AddResource(result, object);
// return result;
bool PreparePreviouslyTrackedResource(PP_Resource resource);
private:
friend struct DefaultSingletonTraits<PluginResourceTracker>;
PluginResourceTracker();
~PluginResourceTracker();
struct ResourceInfo {
ResourceInfo();
ResourceInfo(int ref_count, linked_ptr<PluginResource> r);
ResourceInfo(const ResourceInfo& other);
~ResourceInfo();
ResourceInfo& operator=(const ResourceInfo& other);
int ref_count;
linked_ptr<PluginResource> resource; // May be NULL.
};
void ReleasePluginResourceRef(const PP_Resource& var,
bool notify_browser_on_release);
// Sends a ReleaseResource message to the host corresponding to the given
// resource.
void SendReleaseResourceToHost(PP_Resource resource_id,
PluginResource* resource);
typedef std::map<PP_Resource, ResourceInfo> ResourceMap;
ResourceMap resource_map_;
};
} // namespace proxy
} // namespace pp
#endif // PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
|
