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 "mozilla/gfx/2D.h"
  13 #include "prthread.h"
  14 #include <windows.h>
  15
  16 namespace mozilla {
  17 namespace widget {
  18 namespace remote_backbuffer {
  19
  20 struct IpcRect;
  21 struct SharedData;
  22 struct BorrowResponseData;
  23 struct PresentRequestData;
  24 struct PresentResponseData;
  25 class SharedImage;
  26 class PresentableSharedImage;
  27
  28 class Provider {
  29  public:
  30   Provider();
  31   ~Provider();
  32
  33   bool Initialize(HWND aWindowHandle, DWORD aTargetProcessId);
  34
  35   Maybe<RemoteBackbufferHandles> CreateRemoteHandles();
  36
  37   Provider(const Provider&) = delete;
  38   Provider(Provider&&) = delete;
  39   Provider& operator=(const Provider&) = delete;
  40   Provider& operator=(Provider&&) = delete;
  41
  42  private:
  43   void ThreadMain();
  44
  45   void HandleBorrowRequest(BorrowResponseData* aResponseData,
  46                            bool aAllowSameBuffer);
  47   void HandlePresentRequest(const PresentRequestData& aRequestData,
  48                             PresentResponseData* aResponseData);
  49
  50   HWND mWindowHandle;
  51   HANDLE mTargetProcess;
  52   HANDLE mFileMapping;
  53   HANDLE mRequestReadyEvent;
  54   HANDLE mResponseReadyEvent;
  55   SharedData* mSharedDataPtr;
  56   bool mStopServiceThread;
  57   PRThread* mServiceThread;
  58   std::unique_ptr<PresentableSharedImage> mBackbuffer;
  59 };
  60
  61 class Client {
  62  public:
  63   Client();
  64   ~Client();
  65
  66   bool Initialize(const RemoteBackbufferHandles& aRemoteHandles);
  67
  68   already_AddRefed<gfx::DrawTarget> BorrowDrawTarget();
  69   bool PresentDrawTarget(gfx::IntRegion aDirtyRegion);
  70
  71   Client(const Client&) = delete;
  72   Client(Client&&) = delete;
  73   Client& operator=(const Client&) = delete;
  74   Client& operator=(Client&&) = delete;
  75
  76  private:
  77   HANDLE mFileMapping;
  78   HANDLE mRequestReadyEvent;
  79   HANDLE mResponseReadyEvent;
  80   SharedData* mSharedDataPtr;
  81   std::unique_ptr<SharedImage> mBackbuffer;
  82 };
  83
  84 }  // namespace remote_backbuffer
  85 }  // namespace widget
  86 }  // namespace mozilla
  87
  88 #endif  // widget_windows_RemoteBackbuffer_h