Cache image data objects.

ppapi/proxy/ppb_image_data_proxy.h

 // Copyright (c) 2012 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_PPB_IMAGE_DATA_PROXY_H_
 #define PPAPI_PPB_IMAGE_DATA_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "build/build_config.h"
@@ skipping 32 matching lines @@
   // more consistent across platforms for NaCl, so that we can communicate to
   // the host OS in a consistent way.
   ImageData(const ppapi::HostResource& resource,
             const PP_ImageDataDesc& desc,
             const base::SharedMemoryHandle& handle);
 #endif
   virtual ~ImageData();
 
   // Resource overrides.
   virtual ppapi::thunk::PPB_ImageData_API* AsPPB_ImageData_API() OVERRIDE;
+  virtual void LastPluginRefWasDeleted() OVERRIDE;
 
   // PPB_ImageData API.
   virtual PP_Bool Describe(PP_ImageDataDesc* desc) OVERRIDE;
   virtual void* Map() OVERRIDE;
   virtual void Unmap() OVERRIDE;
   virtual int32_t GetSharedMemory(int* handle, uint32_t* byte_count) OVERRIDE;
   virtual skia::PlatformCanvas* GetPlatformCanvas() OVERRIDE;
   virtual SkCanvas* GetCanvas() OVERRIDE;
 
   const PP_ImageDataDesc& desc() const { return desc_; }
 
+  // Fills the contents of the image with 0.
+  void ZeroContents();
+
 #if !defined(OS_NACL)
   static ImageHandle NullHandle();
   static ImageHandle HandleFromInt(int32_t i);
 #endif
 
  private:
   PP_ImageDataDesc desc_;
 
 #if defined(OS_NACL)
   base::SharedMemory shm_;
@@ skipping 18 matching lines @@
                                          PP_ImageDataFormat format,
                                          const PP_Size& size,
                                          PP_Bool init_to_zero);
 
   // InterfaceProxy implementation.
   virtual bool OnMessageReceived(const IPC::Message& msg);
 
   static const ApiID kApiID = API_ID_PPB_IMAGE_DATA;
 
  private:
-  // Message handlers.
+  // Plugin->Host message handlers.
   void OnHostMsgCreate(PP_Instance instance,
                        int32_t format,
                        const PP_Size& size,
                        PP_Bool init_to_zero,
                        HostResource* result,
                        std::string* image_data_desc,
                        ImageHandle* result_image_handle);
   void OnHostMsgCreateNaCl(PP_Instance instance,
                            int32_t format,
                            const PP_Size& size,
                            PP_Bool init_to_zero,
                            HostResource* result,
                            std::string* image_data_desc,
                            base::SharedMemoryHandle* result_image_handle);
 
+  // Host->Plugin message handlers.
+  void OnPluginMsgNotifyUnusedImageData(const HostResource& old_image_data);
+
   DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PPB_IMAGE_DATA_PROXY_H_