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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef widget_windows_RemoteBackbuffer_h
#define widget_windows_RemoteBackbuffer_h
#include "nsIWidget.h"
#include "mozilla/widget/PCompositorWidgetParent.h"
#include "mozilla/Maybe.h"
#include "mozilla/gfx/2D.h"
#include "prthread.h"
#include <windows.h>
namespace mozilla {
namespace widget {
namespace remote_backbuffer {
struct IpcRect;
struct SharedData;
struct BorrowResponseData;
struct PresentRequestData;
struct PresentResponseData;
class SharedImage;
class PresentableSharedImage;
class Provider {
bool Initialize(HWND aWindowHandle, DWORD aTargetProcessId,
TransparencyMode aTransparencyMode);
Maybe<RemoteBackbufferHandles> CreateRemoteHandles();
void UpdateTransparencyMode(TransparencyMode aTransparencyMode);
Provider(const Provider&) = delete;
Provider(Provider&&) = delete;
Provider& operator=(const Provider&) = delete;
Provider& operator=(Provider&&) = delete;
void ThreadMain();
void HandleBorrowRequest(BorrowResponseData* aResponseData,
bool aAllowSameBuffer);
void HandlePresentRequest(const PresentRequestData& aRequestData,
PresentResponseData* aResponseData);
HWND mWindowHandle;
HANDLE mTargetProcess;
HANDLE mFileMapping;
HANDLE mRequestReadyEvent;
HANDLE mResponseReadyEvent;
SharedData* mSharedDataPtr;
bool mStopServiceThread;
PRThread* mServiceThread;
std::unique_ptr<PresentableSharedImage> mBackbuffer;
mozilla::Atomic<uint32_t, MemoryOrdering::Relaxed> mTransparencyMode;
TransparencyMode GetTransparencyMode() const {
return TransparencyMode(uint32_t(mTransparencyMode));
class Client {
bool Initialize(const RemoteBackbufferHandles& aRemoteHandles);
already_AddRefed<gfx::DrawTarget> BorrowDrawTarget();
bool PresentDrawTarget(gfx::IntRegion aDirtyRegion);
Client(const Client&) = delete;
Client(Client&&) = delete;
Client& operator=(const Client&) = delete;
Client& operator=(Client&&) = delete;
HANDLE mFileMapping;
HANDLE mRequestReadyEvent;
HANDLE mResponseReadyEvent;
SharedData* mSharedDataPtr;
std::unique_ptr<SharedImage> mBackbuffer;
} // namespace remote_backbuffer
} // namespace widget
} // namespace mozilla
#endif // widget_windows_RemoteBackbuffer_h