widget/windows/RemoteBackbuffer.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef widget_windows_RemoteBackbuffer_h
   7 #define widget_windows_RemoteBackbuffer_h
   8
   9 #include "nsIWidget.h"
  10 #include "mozilla/widget/PCompositorWidgetParent.h"
  11 #include "mozilla/Maybe.h"
  12 #include <thread>
  13 #include <windows.h>
  14
  15 namespace mozilla {
  16 namespace widget {
  17 namespace remote_backbuffer {
  18
  19 struct IpcRect;
  20 struct SharedData;
  21 struct BorrowResponseData;
  22 struct PresentRequestData;
  23 struct PresentResponseData;
  24 class SharedImage;
  25 class PresentableSharedImage;
  26
  27 class Provider {
  28  public:
  29   Provider();
  30   ~Provider();
  31
  32   bool Initialize(HWND aWindowHandle, DWORD aTargetProcessId,
  33                   nsTransparencyMode aTransparencyMode);
  34
  35   Maybe<RemoteBackbufferHandles> CreateRemoteHandles();
  36
  37   void UpdateTransparencyMode(nsTransparencyMode aTransparencyMode);
  38
  39   Provider(const Provider&) = delete;
  40   Provider(Provider&&) = delete;
  41   Provider& operator=(const Provider&) = delete;
  42   Provider& operator=(Provider&&) = delete;
  43
  44  private:
  45   void ThreadMain();
  46
  47   void HandleBorrowRequest(BorrowResponseData* aResponseData,
  48                            bool aAllowSameBuffer);
  49   void HandlePresentRequest(const PresentRequestData& aRequestData,
  50                             PresentResponseData* aResponseData);
  51
  52   HWND mWindowHandle;
  53   DWORD mTargetProcessId;
  54   HANDLE mFileMapping;
  55   HANDLE mRequestReadyEvent;
  56   HANDLE mResponseReadyEvent;
  57   SharedData* mSharedDataPtr;
  58   bool mStopServiceThread;
  59   std::thread mServiceThread;
  60   std::unique_ptr<PresentableSharedImage> mBackbuffer;
  61   mozilla::Atomic<nsTransparencyMode, MemoryOrdering::Relaxed>
  62       mTransparencyMode;
  63 };
  64
  65 class Client {
  66  public:
  67   Client();
  68   ~Client();
  69
  70   bool Initialize(const RemoteBackbufferHandles& aRemoteHandles);
  71
  72   already_AddRefed<gfx::DrawTarget> BorrowDrawTarget();
  73   bool PresentDrawTarget(gfx::IntRegion aDirtyRegion);
  74
  75   Client(const Client&) = delete;
  76   Client(Client&&) = delete;
  77   Client& operator=(const Client&) = delete;
  78   Client& operator=(Client&&) = delete;
  79
  80  private:
  81   HANDLE mFileMapping;
  82   HANDLE mRequestReadyEvent;
  83   HANDLE mResponseReadyEvent;
  84   SharedData* mSharedDataPtr;
  85   std::unique_ptr<SharedImage> mBackbuffer;
  86 };
  87
  88 }  // namespace remote_backbuffer
  89 }  // namespace widget
  90 }  // namespace mozilla
  91
  92 #endif  // widget_windows_RemoteBackbuffer_h