ppapi/proxy/ppb_image_data_proxy.h

   1 // Copyright (c) 2012 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 PPAPI_PPB_IMAGE_DATA_PROXY_H_
   6 #define PPAPI_PPB_IMAGE_DATA_PROXY_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/memory/shared_memory.h"
  10 #include "build/build_config.h"
  11 #include "ipc/ipc_platform_file.h"
  12 #include "ppapi/c/pp_bool.h"
  13 #include "ppapi/c/pp_completion_callback.h"
  14 #include "ppapi/c/pp_instance.h"
  15 #include "ppapi/c/pp_module.h"
  16 #include "ppapi/c/pp_resource.h"
  17 #include "ppapi/c/pp_size.h"
  18 #include "ppapi/c/pp_var.h"
  19 #include "ppapi/c/ppb_image_data.h"
  20 #include "ppapi/proxy/interface_proxy.h"
  21 #include "ppapi/proxy/ppapi_proxy_export.h"
  22 #include "ppapi/proxy/serialized_structs.h"
  23 #include "ppapi/shared_impl/ppb_image_data_shared.h"
  24 #include "ppapi/shared_impl/resource.h"
  25 #include "ppapi/thunk/ppb_image_data_api.h"
  26
  27 class TransportDIB;
  28
  29 namespace ppapi {
  30 namespace proxy {
  31
  32 class SerializedHandle;
  33
  34 // ImageData is an abstract base class for image data resources. Unlike most
  35 // resources, ImageData must be public in the header since a number of other
  36 // resources need to access it.
  37 class PPAPI_PROXY_EXPORT ImageData
  38     : public ppapi::Resource,
  39       public NON_EXPORTED_BASE(ppapi::thunk::PPB_ImageData_API),
  40       public ppapi::PPB_ImageData_Shared {
  41  public:
  42   ~ImageData() override;
  43
  44   // Resource overrides.
  45   ppapi::thunk::PPB_ImageData_API* AsPPB_ImageData_API() override;
  46   void LastPluginRefWasDeleted() override;
  47   void InstanceWasDeleted() override;
  48
  49   // PPB_ImageData API.
  50   PP_Bool Describe(PP_ImageDataDesc* desc) override;
  51   int32_t GetSharedMemory(int* handle, uint32_t* byte_count) override;
  52   void SetIsCandidateForReuse() override;
  53
  54   PPB_ImageData_Shared::ImageDataType type() const { return type_; }
  55   const PP_ImageDataDesc& desc() const { return desc_; }
  56
  57   // Prepares this image data to be recycled to the plugin. Clears the contents
  58   // if zero_contents is true.
  59   void RecycleToPlugin(bool zero_contents);
  60
  61  protected:
  62   ImageData(const ppapi::HostResource& resource,
  63             PPB_ImageData_Shared::ImageDataType type,
  64             const PP_ImageDataDesc& desc);
  65
  66   PPB_ImageData_Shared::ImageDataType type_;
  67   PP_ImageDataDesc desc_;
  68
  69   // Set to true when this ImageData is a good candidate for reuse.
  70   bool is_candidate_for_reuse_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(ImageData);
  73 };
  74
  75 // PlatformImageData is a full featured image data resource which can access
  76 // the underlying platform-specific canvas and ImageHandle. This can't be used
  77 // by NaCl apps.
  78 #if !defined(OS_NACL)
  79 class PPAPI_PROXY_EXPORT PlatformImageData : public ImageData {
  80  public:
  81   PlatformImageData(const ppapi::HostResource& resource,
  82                     const PP_ImageDataDesc& desc,
  83                     ImageHandle handle);
  84   ~PlatformImageData() override;
  85
  86   // PPB_ImageData API.
  87   void* Map() override;
  88   void Unmap() override;
  89   SkCanvas* GetPlatformCanvas() override;
  90   SkCanvas* GetCanvas() override;
  91
  92   static ImageHandle NullHandle();
  93   static ImageHandle HandleFromInt(int32_t i);
  94
  95  private:
  96   scoped_ptr<TransportDIB> transport_dib_;
  97
  98   // Null when the image isn't mapped.
  99   scoped_ptr<SkCanvas> mapped_canvas_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(PlatformImageData);
 102 };
 103 #endif  // !defined(OS_NACL)
 104
 105 // SimpleImageData is a simple, platform-independent image data resource which
 106 // can be used by NaCl. It can also be used by trusted apps when access to the
 107 // platform canvas isn't needed.
 108 class PPAPI_PROXY_EXPORT SimpleImageData : public ImageData {
 109  public:
 110   SimpleImageData(const ppapi::HostResource& resource,
 111                   const PP_ImageDataDesc& desc,
 112                   const base::SharedMemoryHandle& handle);
 113   ~SimpleImageData() override;
 114
 115   // PPB_ImageData API.
 116   void* Map() override;
 117   void Unmap() override;
 118   SkCanvas* GetPlatformCanvas() override;
 119   SkCanvas* GetCanvas() override;
 120
 121  private:
 122   base::SharedMemory shm_;
 123   uint32 size_;
 124   int map_count_;
 125
 126   DISALLOW_COPY_AND_ASSIGN(SimpleImageData);
 127 };
 128
 129 class PPB_ImageData_Proxy : public InterfaceProxy {
 130  public:
 131   PPB_ImageData_Proxy(Dispatcher* dispatcher);
 132   ~PPB_ImageData_Proxy() override;
 133
 134   static PP_Resource CreateProxyResource(
 135       PP_Instance instance,
 136       PPB_ImageData_Shared::ImageDataType type,
 137       PP_ImageDataFormat format,
 138       const PP_Size& size,
 139       PP_Bool init_to_zero);
 140
 141   // InterfaceProxy implementation.
 142   bool OnMessageReceived(const IPC::Message& msg) override;
 143
 144   // Utility for creating ImageData resources.
 145   // This can only be called on the host side of the proxy.
 146   // On failure, will return invalid resource (0). On success it will return a
 147   // valid resource and the out params will be written.
 148   // |desc| contains the result of Describe.
 149   // |image_handle| and |byte_count| contain the result of GetSharedMemory.
 150   // NOTE: if |init_to_zero| is false, you should write over the entire image
 151   // to avoid leaking sensitive data to a less privileged process.
 152   PPAPI_PROXY_EXPORT static PP_Resource CreateImageData(
 153       PP_Instance instance,
 154       PPB_ImageData_Shared::ImageDataType type,
 155       PP_ImageDataFormat format,
 156       const PP_Size& size,
 157       bool init_to_zero,
 158       PP_ImageDataDesc* desc,
 159       IPC::PlatformFileForTransit* image_handle,
 160       uint32_t* byte_count);
 161
 162   static const ApiID kApiID = API_ID_PPB_IMAGE_DATA;
 163
 164  private:
 165   // Plugin->Host message handlers.
 166   void OnHostMsgCreatePlatform(
 167       PP_Instance instance,
 168       int32_t format,
 169       const PP_Size& size,
 170       PP_Bool init_to_zero,
 171       HostResource* result,
 172       PP_ImageDataDesc* desc,
 173       ImageHandle* result_image_handle);
 174   void OnHostMsgCreateSimple(
 175       PP_Instance instance,
 176       int32_t format,
 177       const PP_Size& size,
 178       PP_Bool init_to_zero,
 179       HostResource* result,
 180       PP_ImageDataDesc* desc,
 181       ppapi::proxy::SerializedHandle* result_image_handle);
 182
 183   // Host->Plugin message handlers.
 184   void OnPluginMsgNotifyUnusedImageData(const HostResource& old_image_data);
 185
 186   DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Proxy);
 187 };
 188
 189 }  // namespace proxy
 190 }  // namespace ppapi
 191
 192 #endif  // PPAPI_PPB_IMAGE_DATA_PROXY_H_