Split out ChildWindowWin

gpu/ipc/service/child_window_surface_win.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/ipc/service/child_window_surface_win.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ptr_util.h"
-#include "base/threading/thread.h"
-#include "base/win/scoped_hdc.h"
-#include "base/win/wrapped_window_proc.h"
 #include "gpu/ipc/common/gpu_messages.h"
 #include "gpu/ipc/service/gpu_channel_manager.h"
 #include "gpu/ipc/service/gpu_channel_manager_delegate.h"
 #include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/win/hwnd_util.h"
-#include "ui/gfx/win/window_impl.h"
 #include "ui/gl/egl_util.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_surface_egl.h"
 #include "ui/gl/scoped_make_current.h"
 
 namespace gpu {
 
-// This owns the thread and contains data that's shared between the threads.
-struct SharedData {
-  SharedData() : thread("Window owner thread") {}
-
-  base::Lock rect_lock;
-  gfx::Rect rect_to_clear;
-
-  base::Thread thread;
-};
-
-namespace {
-
-ATOM g_window_class;
-
-// This runs on the window owner thread.
-LRESULT CALLBACK IntermediateWindowProc(HWND window,
-                                        UINT message,
-                                        WPARAM w_param,
-                                        LPARAM l_param) {
-  switch (message) {
-    case WM_ERASEBKGND:
-      // Prevent windows from erasing the background.
-      return 1;
-    case WM_PAINT:
-      PAINTSTRUCT paint;
-      if (BeginPaint(window, &paint)) {
-        SharedData* shared_data =
-            reinterpret_cast<SharedData*>(gfx::GetWindowUserData(window));
-        DCHECK(shared_data);
-        {
-          base::AutoLock lock(shared_data->rect_lock);
-          shared_data->rect_to_clear.Union(gfx::Rect(paint.rcPaint));
-        }
-
-        EndPaint(window, &paint);
-      }
-      return 0;
-    default:
-      return DefWindowProc(window, message, w_param, l_param);
-  }
-}
-
-// This runs on the window owner thread.
-void InitializeWindowClass() {
-  if (g_window_class)
-    return;
-
-  WNDCLASSEX intermediate_class;
-  base::win::InitializeWindowClass(
-      L"Intermediate D3D Window",
-      &base::win::WrappedWindowProc<IntermediateWindowProc>, CS_OWNDC, 0, 0,
-      nullptr, reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)), nullptr,
-      nullptr, nullptr, &intermediate_class);
-  g_window_class = RegisterClassEx(&intermediate_class);
-  if (!g_window_class) {
-    LOG(ERROR) << "RegisterClass failed.";
-    return;
-  }
-}
-
-// Hidden popup window  used as a parent for the child surface window.
-// Must be created and destroyed on the thread.
-class HiddenPopupWindow : public gfx::WindowImpl {
- public:
-  static HWND Create() {
-    gfx::WindowImpl* window = new HiddenPopupWindow;
-
-    window->set_window_style(WS_POPUP);
-    window->set_window_ex_style(WS_EX_TOOLWINDOW);
-    window->Init(GetDesktopWindow(), gfx::Rect());
-    EnableWindow(window->hwnd(), FALSE);
-    // The |window| instance is now owned by the window user data.
-    DCHECK_EQ(window, gfx::GetWindowUserData(window->hwnd()));
-    return window->hwnd();
-  }
-
-  static void Destroy(HWND window) {
-    // This uses the fact that the window user data contains a pointer
-    // to gfx::WindowImpl instance.
-    gfx::WindowImpl* window_data =
-        reinterpret_cast<gfx::WindowImpl*>(gfx::GetWindowUserData(window));
-    DCHECK_EQ(window, window_data->hwnd());
-    DestroyWindow(window);
-    delete window_data;
-  }
-
- private:
-  // Explicitly do nothing in Close. We do this as some external apps may get a
-  // handle to this window and attempt to close it.
-  void OnClose() {}
-
-  CR_BEGIN_MSG_MAP_EX(HiddenPopupWindow)
-    CR_MSG_WM_CLOSE(OnClose)
-  CR_END_MSG_MAP()
-};
-
-// This runs on the window owner thread.
-void CreateWindowsOnThread(const gfx::Size& size,
-                           base::WaitableEvent* event,
-                           SharedData* shared_data,
-                           HWND* child_window,
-                           HWND* parent_window) {
-  InitializeWindowClass();
-  DCHECK(g_window_class);
-
-  // Create hidden parent window on the current thread.
-  *parent_window = HiddenPopupWindow::Create();
-  // Create child window.
-  HWND window = CreateWindowEx(
-      WS_EX_NOPARENTNOTIFY, reinterpret_cast<wchar_t*>(g_window_class), L"",
-      WS_CHILDWINDOW | WS_DISABLED | WS_VISIBLE, 0, 0, size.width(),
-      size.height(), *parent_window, NULL, NULL, NULL);
-  CHECK(window);
-  *child_window = window;
-  gfx::SetWindowUserData(window, shared_data);
-  event->Signal();
-}
-
-// This runs on the main thread after the window was destroyed on window owner
-// thread.
-void DestroySharedData(std::unique_ptr<SharedData> shared_data) {
-  shared_data->thread.Stop();
-}
-
-// This runs on the window owner thread.
-void DestroyWindowsOnThread(HWND child_window, HWND hidden_popup_window) {
-  DestroyWindow(child_window);
-  HiddenPopupWindow::Destroy(hidden_popup_window);
-}
-
-}  // namespace
-
 ChildWindowSurfaceWin::ChildWindowSurfaceWin(
     base::WeakPtr<ImageTransportSurfaceDelegate> delegate,
     HWND parent_window)
     : gl::NativeViewGLSurfaceEGL(0),
-      parent_window_(parent_window),
-      delegate_(delegate),
+      child_window_(delegate, parent_window),
       alpha_(true),
       first_swap_(true) {
   // Don't use EGL_ANGLE_window_fixed_size so that we can avoid recreating the
   // window surface, which can cause flicker on DirectComposition.
   enable_fixed_size_angle_ = false;
 }
 
 EGLConfig ChildWindowSurfaceWin::GetConfig() {
   if (!config_) {
     int alpha_size = alpha_ ? 8 : EGL_DONT_CARE;
@@ skipping 21 matching lines @@
     }
   }
 
   return config_;
 }
 
 bool ChildWindowSurfaceWin::InitializeNativeWindow() {
   if (window_)
     return true;
 
-  shared_data_ = base::MakeUnique<SharedData>();
-
-  base::Thread::Options options(base::MessageLoop::TYPE_UI, 0);
-  shared_data_->thread.StartWithOptions(options);
-
-  base::WaitableEvent event(base::WaitableEvent::ResetPolicy::AUTOMATIC,
-                            base::WaitableEvent::InitialState::NOT_SIGNALED);
-
-  RECT window_rect;
-  GetClientRect(parent_window_, &window_rect);
-
-  shared_data_->thread.task_runner()->PostTask(
-      FROM_HERE,
-      base::Bind(&CreateWindowsOnThread, gfx::Rect(window_rect).size(), &event,
-                 shared_data_.get(), &window_, &initial_parent_window_));
-  event.Wait();
-
-  delegate_->DidCreateAcceleratedSurfaceChildWindow(parent_window_, window_);
-  return true;
+  bool result = child_window_.Initialize();
+  window_ = child_window_.window();

[stanisc, 2017/01/10 20:54:57]

Could you just use child_window_.window() instead of window_ in the rest of the
code?

+  return result;
 }
 
 bool ChildWindowSurfaceWin::Resize(const gfx::Size& size,
                                    float scale_factor,
                                    bool has_alpha) {
   if (!SupportsPostSubBuffer()) {
     if (!MoveWindow(window_, 0, 0, size.width(), size.height(), FALSE)) {
       return false;
     }
     alpha_ = has_alpha;
@@ skipping 39 matching lines @@
 
 gfx::SwapResult ChildWindowSurfaceWin::SwapBuffers() {
   gfx::SwapResult result = NativeViewGLSurfaceEGL::SwapBuffers();
   // Force the driver to finish drawing before clearing the contents to
   // transparent, to reduce or eliminate the period of time where the contents
   // have flashed black.
   if (first_swap_) {
     glFinish();
     first_swap_ = false;
   }
-  ClearInvalidContents();
+  child_window_.ClearInvalidContents();
   return result;
 }
 
 gfx::SwapResult ChildWindowSurfaceWin::PostSubBuffer(int x,
                                                      int y,
                                                      int width,
                                                      int height) {
   gfx::SwapResult result =
       NativeViewGLSurfaceEGL::PostSubBuffer(x, y, width, height);
-  ClearInvalidContents();
+  child_window_.ClearInvalidContents();
   return result;
 }
 
-void ChildWindowSurfaceWin::ClearInvalidContents() {
-  base::AutoLock lock(shared_data_->rect_lock);
-  if (!shared_data_->rect_to_clear.IsEmpty()) {
-    base::win::ScopedGetDC dc(window_);
-
-    RECT rect = shared_data_->rect_to_clear.ToRECT();
-
-    // DirectComposition composites with the contents under the SwapChain,
-    // so ensure that's cleared. GDI treats black as transparent.
-    FillRect(dc, &rect, reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
-    shared_data_->rect_to_clear = gfx::Rect();
-  }
-}
-
 ChildWindowSurfaceWin::~ChildWindowSurfaceWin() {
-  if (shared_data_) {
-    scoped_refptr<base::TaskRunner> task_runner =
-        shared_data_->thread.task_runner();
-    task_runner->PostTaskAndReply(
-        FROM_HERE,
-        base::Bind(&DestroyWindowsOnThread, window_, initial_parent_window_),
-        base::Bind(&DestroySharedData, base::Passed(std::move(shared_data_))));
-  }
 }
 
 }  // namespace gpu