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// Copyright 2017 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 "ui/gl/child_window_win.h"
#include <memory>
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/debug/alias.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_pump_type.h"
#include "base/win/wrapped_window_proc.h"
#include "ui/gfx/win/hwnd_util.h"
#include "ui/gfx/win/window_impl.h"
namespace gl {
namespace {
ATOM g_window_class;
// 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<::DefWindowProc>, 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()
CR_MSG_MAP_CLASS_DECLARATIONS(HiddenPopupWindow)
};
// This runs on the window owner thread.
void CreateWindowsOnThread(const gfx::Size& size,
base::WaitableEvent* event,
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.
// WS_EX_NOPARENTNOTIFY and WS_EX_LAYERED make the window transparent for
// input. WS_EX_NOREDIRECTIONBITMAP avoids allocating a
// bitmap that would otherwise be allocated with WS_EX_LAYERED, the bitmap is
// only necessary if using Gdi objects with the window.
HWND window = CreateWindowEx(
WS_EX_NOPARENTNOTIFY | WS_EX_LAYERED | WS_EX_TRANSPARENT |
WS_EX_NOREDIRECTIONBITMAP,
reinterpret_cast<wchar_t*>(g_window_class), L"",
WS_CHILDWINDOW | WS_DISABLED | WS_VISIBLE, 0, 0, size.width(),
size.height(), *parent_window, nullptr, nullptr, nullptr);
if (!window) {
logging::SystemErrorCode error = logging::GetLastSystemErrorCode();
base::debug::Alias(&error);
CHECK(false);
}
*child_window = window;
event->Signal();
}
// This runs on the main thread after the window was destroyed on window owner
// thread.
void DestroyThread(std::unique_ptr<base::Thread> thread) {
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
ChildWindowWin::ChildWindowWin(HWND parent_window)
: parent_window_(parent_window) {}
void ChildWindowWin::Initialize() {
if (window_)
return;
thread_ = std::make_unique<base::Thread>("Window owner thread");
base::Thread::Options options(base::MessagePumpType::UI, 0);
thread_->StartWithOptions(options);
base::WaitableEvent event(base::WaitableEvent::ResetPolicy::AUTOMATIC,
base::WaitableEvent::InitialState::NOT_SIGNALED);
RECT window_rect;
GetClientRect(parent_window_, &window_rect);
thread_->task_runner()->PostTask(
FROM_HERE,
base::BindOnce(&CreateWindowsOnThread, gfx::Rect(window_rect).size(),
&event, &window_, &initial_parent_window_));
event.Wait();
}
ChildWindowWin::~ChildWindowWin() {
if (thread_) {
scoped_refptr<base::TaskRunner> task_runner = thread_->task_runner();
task_runner->PostTaskAndReply(
FROM_HERE,
base::BindOnce(&DestroyWindowsOnThread, window_,
initial_parent_window_),
base::BindOnce(&DestroyThread, std::move(thread_)));
}
}
scoped_refptr<base::TaskRunner> ChildWindowWin::GetTaskRunnerForTesting() {
DCHECK(thread_);
return thread_->task_runner();
}
} // namespace gl
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