webkit/plugins/ppapi/ppb_buffer_impl.h

   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/shared_memory.h"
  12 #include "ppapi/thunk/ppb_buffer_api.h"
  13 #include "ppapi/shared_impl/resource.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_