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