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1 // Copyright (c) 2011 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_PPB_BUFFER_IMPL_H_ | |
6 #define WEBKIT_PLUGINS_PPAPI_PPB_BUFFER_IMPL_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/memory/shared_memory.h" | |
12 #include "ppapi/shared_impl/resource.h" | |
13 #include "ppapi/thunk/ppb_buffer_api.h" | |
14 #include "webkit/plugins/webkit_plugins_export.h" | |
15 | |
16 namespace webkit { | |
17 namespace ppapi { | |
18 | |
19 class WEBKIT_PLUGINS_EXPORT PPB_Buffer_Impl : | |
20 public ::ppapi::Resource, | |
21 public ::ppapi::thunk::PPB_Buffer_API { | |
22 public: | |
23 virtual ~PPB_Buffer_Impl(); | |
24 | |
25 static PP_Resource Create(PP_Instance instance, uint32_t size); | |
26 static scoped_refptr<PPB_Buffer_Impl> CreateResource(PP_Instance instance, | |
27 uint32_t size); | |
28 | |
29 virtual PPB_Buffer_Impl* AsPPB_Buffer_Impl(); | |
30 | |
31 base::SharedMemory* shared_memory() const { return shared_memory_.get(); } | |
32 uint32_t size() const { return size_; } | |
33 | |
34 // Resource overrides. | |
35 virtual ::ppapi::thunk::PPB_Buffer_API* AsPPB_Buffer_API() OVERRIDE; | |
36 | |
37 // PPB_Buffer_API implementation. | |
38 virtual PP_Bool Describe(uint32_t* size_in_bytes) OVERRIDE; | |
39 virtual PP_Bool IsMapped() OVERRIDE; | |
40 virtual void* Map() OVERRIDE; | |
41 virtual void Unmap() OVERRIDE; | |
42 | |
43 // Trusted. | |
44 virtual int32_t GetSharedMemory(int* handle) OVERRIDE; | |
45 | |
46 private: | |
47 explicit PPB_Buffer_Impl(PP_Instance instance); | |
48 bool Init(uint32_t size); | |
49 | |
50 scoped_ptr<base::SharedMemory> shared_memory_; | |
51 uint32_t size_; | |
52 int map_count_; | |
53 | |
54 DISALLOW_COPY_AND_ASSIGN(PPB_Buffer_Impl); | |
55 }; | |
56 | |
57 // Ensures that the given buffer is mapped, and returns it to its previous | |
58 // mapped state in the destructor. | |
59 class BufferAutoMapper { | |
60 public: | |
61 explicit BufferAutoMapper(::ppapi::thunk::PPB_Buffer_API* api); | |
62 ~BufferAutoMapper(); | |
63 | |
64 // Will be NULL on failure to map. | |
65 void* data() { return data_; } | |
66 uint32_t size() { return size_; } | |
67 | |
68 private: | |
69 ::ppapi::thunk::PPB_Buffer_API* api_; | |
70 | |
71 bool needs_unmap_; | |
72 | |
73 void* data_; | |
74 uint32_t size_; | |
75 | |
76 DISALLOW_COPY_AND_ASSIGN(BufferAutoMapper); | |
77 }; | |
78 | |
79 } // namespace ppapi | |
80 } // namespace webkit | |
81 | |
82 #endif // WEBKIT_PLUGINS_PPAPI_PPB_BUFFER_IMPL_H_ | |
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