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Minimal test - lines (19, 212)

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namespace mozilla {
namespace widget {

static StaticRefPtr sWinCompositorWindowThread;

WinCompositorWindowThread::WinCompositorWindowThread(base::Thread* aThread)
    : mThread(aThread) {}

WinCompositorWindowThread::~WinCompositorWindowThread() { delete mThread; }

/* static */
WinCompositorWindowThread* WinCompositorWindowThread::Get() {
  return sWinCompositorWindowThread;
}

/* static */
void WinCompositorWindowThread::Start() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!sWinCompositorWindowThread);

  base::Thread* thread = new base::Thread("WinCompositor");

  base::Thread::Options options;
  // HWND requests ui thread.
  options.message_loop_type = MessageLoop::TYPE_UI;

  if (!thread->StartWithOptions(options)) {
    delete thread;
    return;
  }

  sWinCompositorWindowThread = new WinCompositorWindowThread(thread);
}

/* static */
void WinCompositorWindowThread::ShutDown() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(sWinCompositorWindowThread);

  layers::SynchronousTask task("WinCompositorWindowThread");
  RefPtr runnable = WrapRunnable(
      RefPtr(sWinCompositorWindowThread.get()),
      &WinCompositorWindowThread::ShutDownTask, &task);
  sWinCompositorWindowThread->Loop()->PostTask(runnable.forget());
  task.Wait();

  sWinCompositorWindowThread = nullptr;
}

void WinCompositorWindowThread::ShutDownTask(layers::SynchronousTask* aTask) {
  layers::AutoCompleteTask complete(aTask);
  MOZ_ASSERT(IsInCompositorWindowThread());
}

/* static */
MessageLoop* WinCompositorWindowThread::Loop() {
  return sWinCompositorWindowThread
             ? sWinCompositorWindowThread->mThread->message_loop()
             : nullptr;
}

/* static */
bool WinCompositorWindowThread::IsInCompositorWindowThread() {
  return sWinCompositorWindowThread &&
         sWinCompositorWindowThread->mThread->thread_id() ==
             PlatformThread::CurrentId();
}

const wchar_t kClassNameCompositorInitalParent[] =
    L"MozillaCompositorInitialParentClass";
const wchar_t kClassNameCompositor[] = L"MozillaCompositorWindowClass";

ATOM g_compositor_inital_parent_window_class;
ATOM g_compositor_window_class;

// This runs on the window owner thread.
void InitializeInitialParentWindowClass() {
  if (g_compositor_inital_parent_window_class) {
    return;
  }

  WNDCLASSW wc;
  wc.style = 0;
  wc.lpfnWndProc = ::DefWindowProcW;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  wc.hInstance = GetModuleHandle(nullptr);
  wc.hIcon = nullptr;
  wc.hCursor = nullptr;
  wc.hbrBackground = nullptr;
  wc.lpszMenuName = nullptr;
  wc.lpszClassName = kClassNameCompositorInitalParent;
  g_compositor_inital_parent_window_class = ::RegisterClassW(&wc);
}

// This runs on the window owner thread.
void InitializeWindowClass() {
  if (g_compositor_window_class) {
    return;
  }

  WNDCLASSW wc;
  wc.style = CS_OWNDC;
  wc.lpfnWndProc = ::DefWindowProcW;
  wc.cbClsExtra = 0;
  wc.cbWndExtra = 0;
  wc.hInstance = GetModuleHandle(nullptr);
  wc.hIcon = nullptr;
  wc.hCursor = nullptr;
  wc.hbrBackground = nullptr;
  wc.lpszMenuName = nullptr;
  wc.lpszClassName = kClassNameCompositor;
  g_compositor_window_class = ::RegisterClassW(&wc);
}

/* static */
WinCompositorWnds WinCompositorWindowThread::CreateCompositorWindow() {
  MOZ_ASSERT(Loop());

  if (!Loop()) {
    return WinCompositorWnds(nullptr, nullptr);
  }

  layers::SynchronousTask task("Create compositor window");

  HWND initialParentWnd = nullptr;
  HWND compositorWnd = nullptr;

  RefPtr runnable = NS_NewRunnableFunction(
      "WinCompositorWindowThread::CreateCompositorWindow::Runnable", [&]() {
        layers::AutoCompleteTask complete(&task);

        InitializeInitialParentWindowClass();
        InitializeWindowClass();

        // Create initial parent window.
        // We could not directly create a compositor window with a main window
        // as parent window, so instead create it with a temporary placeholder
        // parent. Its parent is set as main window in UI process.
        initialParentWnd =
            ::CreateWindowEx(WS_EX_TOOLWINDOW, kClassNameCompositorInitalParent,
                             nullptr, WS_POPUP | WS_DISABLED, 0, 0, 1, 1,
                             nullptr, 0, GetModuleHandle(nullptr), 0);
        if (!initialParentWnd) {
          gfxCriticalNoteOnce << "Inital parent window failed "
                              << ::GetLastError();
          return;
        }

        DWORD extendedStyle = WS_EX_NOPARENTNOTIFY | WS_EX_NOREDIRECTIONBITMAP;

        if (!StaticPrefs::apz_windows_force_disable_direct_manipulation()) {
          extendedStyle |= WS_EX_LAYERED | WS_EX_TRANSPARENT;
        }

        compositorWnd = ::CreateWindowEx(
            extendedStyle, kClassNameCompositor, nullptr,
            WS_CHILDWINDOW | WS_DISABLED | WS_VISIBLE, 0, 0, 1, 1,
            initialParentWnd, 0, GetModuleHandle(nullptr), 0);
        if (!compositorWnd) {
          gfxCriticalNoteOnce << "Compositor window failed "
                              << ::GetLastError();
        }
      });

  Loop()->PostTask(runnable.forget());

  task.Wait();

  return WinCompositorWnds(compositorWnd, initialParentWnd);
}

/* static */
void WinCompositorWindowThread::DestroyCompositorWindow(
    WinCompositorWnds aWnds) {
  MOZ_ASSERT(aWnds.mCompositorWnd);
  MOZ_ASSERT(aWnds.mInitialParentWnd);
  MOZ_ASSERT(Loop());

  if (!Loop()) {
    return;
  }

  RefPtr runnable = NS_NewRunnableFunction(
      "WinCompositorWidget::CreateNativeWindow::Runnable", [aWnds]() {
        ::DestroyWindow(aWnds.mCompositorWnd);
        ::DestroyWindow(aWnds.mInitialParentWnd);
      });

  Loop()->PostTask(runnable.forget());
}

}  // namespace widget
}  // namespace mozilla