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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/media/capture/aura_window_video_capture_device.h"
#include <optional>
#include <utility>
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "content/browser/media/capture/mouse_cursor_overlay_controller.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/desktop_media_id.h"
#include "content/public/common/content_features.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/aura/window_occlusion_tracker.h"
#include "ui/aura/window_tree_host.h"
namespace content {
// Threading note: This is constructed on the device thread, while the
// destructor and the rest of the class will run exclusively on the UI thread.
class AuraWindowVideoCaptureDevice::WindowTracker final
: public aura::WindowObserver {
public:
WindowTracker(base::WeakPtr<AuraWindowVideoCaptureDevice> device,
MouseCursorOverlayController* cursor_controller,
const DesktopMediaID& source_id)
: device_(std::move(device)),
device_task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()),
cursor_controller_(cursor_controller),
target_type_(source_id.type) {
DCHECK(device_task_runner_);
DCHECK(cursor_controller_);
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&WindowTracker::ResolveTarget,
weak_ptr_factory_.GetWeakPtr(), source_id));
}
WindowTracker(const WindowTracker&) = delete;
WindowTracker& operator=(const WindowTracker&) = delete;
~WindowTracker() final {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (target_window_) {
target_window_->RemoveObserver(this);
}
}
DesktopMediaID::Type target_type() const { return target_type_; }
aura::Window* target_window() const {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return target_window_;
}
private:
// Determines which frame sink and aura::Window should be targeted for capture
// and notifies the device.
void ResolveTarget(const DesktopMediaID& source_id) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// Since ResolveTarget() should only ever be called once, expect
// |target_window_| to be null at this point.
DCHECK(!target_window_);
target_window_ = DesktopMediaID::GetNativeWindowById(source_id);
aura::Window* const root_window =
target_window_ ? target_window_->GetRootWindow() : nullptr;
if (!target_window_ || !root_window->GetFrameSinkId().is_valid()) {
device_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FrameSinkVideoCaptureDevice::OnTargetPermanentlyLost,
device_));
return;
}
target_ = viz::VideoCaptureTarget(root_window->GetFrameSinkId());
if (!target_window_->IsRootWindow()) {
capture_request_ = target_window_->MakeWindowCapturable();
target_->sub_target = capture_request_.GetCaptureId();
}
video_capture_lock_ = target_window_->GetHost()->CreateVideoCaptureLock();
#if BUILDFLAG(IS_CHROMEOS)
force_visible_.emplace(target_window_);
#endif
target_window_->AddObserver(this);
device_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FrameSinkVideoCaptureDevice::OnTargetChanged, device_,
target_, /*sub_capture_target_version=*/0));
// Note: The MouseCursorOverlayController runs on the UI thread. It's also
// important that SetTargetView() be called in the current stack while
// |target_window_| is known to be a valid pointer.
// http://crbug.com/818679
//
// NOTE: for Aura capture, the cursor controller's view should always be
// the root compositor frame sink.
cursor_controller_->SetTargetView(root_window);
}
// aura::WindowObserver override.
void OnWindowDestroying(aura::Window* window) final {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(window, target_window_);
video_capture_lock_.reset();
target_window_->RemoveObserver(this);
target_window_ = nullptr;
#if BUILDFLAG(IS_CHROMEOS)
force_visible_.reset();
#endif
device_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FrameSinkVideoCaptureDevice::OnTargetPermanentlyLost,
device_));
cursor_controller_->SetTargetView(gfx::NativeView());
}
#if BUILDFLAG(IS_CHROMEOS)
void OnWindowAddedToRootWindow(aura::Window* window) final {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK_EQ(window, target_window_);
viz::FrameSinkId new_frame_sink_id =
target_window_->GetRootWindow()->GetFrameSinkId();
// Since the window is not destroyed, only re-parented, we can keep the
// same subtree ID and only update the FrameSinkId of the target.
DCHECK(target_);
if (new_frame_sink_id != target_->frame_sink_id) {
target_->frame_sink_id = new_frame_sink_id;
device_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&FrameSinkVideoCaptureDevice::OnTargetChanged, device_,
target_.value(), /*sub_capture_target_version=*/0));
}
}
#endif
private:
// |device_| may be dereferenced only by tasks run by |device_task_runner_|.
const base::WeakPtr<FrameSinkVideoCaptureDevice> device_;
const scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
// Owned by FrameSinkVideoCaptureDevice. This will be valid for the life of
// WindowTracker because the WindowTracker deleter task will be posted to the
// UI thread before the MouseCursorOverlayController deleter task.
const raw_ptr<MouseCursorOverlayController> cursor_controller_;
const DesktopMediaID::Type target_type_;
raw_ptr<aura::Window> target_window_ = nullptr;
#if BUILDFLAG(IS_CHROMEOS)
std::optional<aura::WindowOcclusionTracker::ScopedForceVisible>
force_visible_;
#endif
aura::ScopedWindowCaptureRequest capture_request_;
std::optional<viz::VideoCaptureTarget> target_;
std::unique_ptr<aura::WindowTreeHost::VideoCaptureLock> video_capture_lock_;
base::WeakPtrFactory<AuraWindowVideoCaptureDevice::WindowTracker>
weak_ptr_factory_{this};
};
AuraWindowVideoCaptureDevice::AuraWindowVideoCaptureDevice(
const DesktopMediaID& source_id) {
tracker_.reset(new WindowTracker(weak_ptr_factory_.GetWeakPtr(),
cursor_controller(), source_id));
}
AuraWindowVideoCaptureDevice::~AuraWindowVideoCaptureDevice() = default;
} // namespace content
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