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1 // Copyright (c) 2010 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 WEBKIT_PLUGINS_PPAPI_PLUGIN_OBJECT_H_ | |
6 #define WEBKIT_PLUGINS_PPAPI_PLUGIN_OBJECT_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/basictypes.h" | |
11 | |
12 struct PP_Var; | |
13 struct PPP_Class_Deprecated; | |
14 typedef struct NPObject NPObject; | |
15 typedef struct _NPVariant NPVariant; | |
16 | |
17 namespace webkit { | |
18 namespace ppapi { | |
19 | |
20 class PluginInstanceImpl; | |
21 | |
22 // A PluginObject is a JS-accessible object implemented by the plugin. | |
23 // | |
24 // In contrast, a var of type PP_VARTYPE_OBJECT is a reference to a JS object, | |
25 // which might be implemented by the plugin (here) or by the JS engine. | |
26 class PluginObject { | |
27 public: | |
28 virtual ~PluginObject(); | |
29 | |
30 // Allocates a new PluginObject and returns it as a PP_Var with a | |
31 // refcount of 1. | |
32 static PP_Var Create(PluginInstanceImpl* instance, | |
33 const PPP_Class_Deprecated* ppp_class, | |
34 void* ppp_class_data); | |
35 | |
36 PluginInstanceImpl* instance() const { return instance_; } | |
37 | |
38 const PPP_Class_Deprecated* ppp_class() { return ppp_class_; } | |
39 void* ppp_class_data() { return ppp_class_data_; }; | |
40 | |
41 NPObject* GetNPObject() const; | |
42 | |
43 // Returns true if the given var is an object implemented by the same plugin | |
44 // that owns the var object, and that the class matches. If it matches, | |
45 // returns true and places the class data into |*ppp_class_data| (which can | |
46 // optionally be NULL if no class data is desired). | |
47 static bool IsInstanceOf(NPObject* np_object, | |
48 const PPP_Class_Deprecated* ppp_class, | |
49 void** ppp_class_data); | |
50 | |
51 // Converts the given NPObject to the corresponding ObjectVar. | |
52 // | |
53 // The given NPObject must be one corresponding to a PluginObject or this | |
54 // will crash. If the object is a PluginObject but the plugin has gone | |
55 // away (the object could still be alive because of a reference from JS), | |
56 // then the return value will be NULL. | |
57 static PluginObject* FromNPObject(NPObject* object); | |
58 | |
59 // Allocates a plugin wrapper object and returns it as an NPObject. This is | |
60 // used internally only. | |
61 static NPObject* AllocateObjectWrapper(); | |
62 | |
63 private: | |
64 struct NPObjectWrapper; | |
65 | |
66 // This object must be created using the CreateObject function of the which | |
67 // will set up the correct NPObject. | |
68 // | |
69 // The NPObjectWrapper (an NPObject) should already have the reference | |
70 // incremented on it, and this class will take ownership of that reference. | |
71 PluginObject(PluginInstanceImpl* instance, | |
72 NPObjectWrapper* object_wrapper, | |
73 const PPP_Class_Deprecated* ppp_class, | |
74 void* ppp_class_data); | |
75 | |
76 PluginInstanceImpl* instance_; | |
77 | |
78 // Holds a pointer to the NPObject wrapper backing the var. This class | |
79 // derives from NPObject and we hold a reference to it, so it must be | |
80 // refcounted. When the type is not an object, this value will be NULL. | |
81 // | |
82 // We don't actually own this pointer, it's the NPObject that actually | |
83 // owns us. | |
84 NPObjectWrapper* object_wrapper_; | |
85 | |
86 const PPP_Class_Deprecated* ppp_class_; | |
87 void* ppp_class_data_; | |
88 | |
89 DISALLOW_COPY_AND_ASSIGN(PluginObject); | |
90 }; | |
91 | |
92 } // namespace ppapi | |
93 } // namespace webkit | |
94 | |
95 #endif // WEBKIT_PLUGINS_PPAPI_PLUGIN_OBJECT_H_ | |
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