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// Copyright 2014 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 "media/capture/video/linux/video_capture_device_chromeos.h"
#include <stdint.h>
#include "base/bind.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "ui/gfx/display.h"
#include "ui/gfx/display_observer.h"
#include "ui/gfx/screen.h"
namespace media {
// This is a delegate class used to transfer Display change events from the UI
// thread to the media thread.
class VideoCaptureDeviceChromeOS::ScreenObserverDelegate
: public gfx::DisplayObserver,
public base::RefCountedThreadSafe<ScreenObserverDelegate> {
public:
ScreenObserverDelegate(
VideoCaptureDeviceChromeOS* capture_device,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner)
: capture_device_(capture_device),
ui_task_runner_(ui_task_runner),
capture_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
ui_task_runner_->PostTask(
FROM_HERE,
base::Bind(&ScreenObserverDelegate::AddObserverOnUIThread, this));
}
void RemoveObserver() {
DCHECK(capture_task_runner_->BelongsToCurrentThread());
capture_device_ = NULL;
ui_task_runner_->PostTask(
FROM_HERE,
base::Bind(&ScreenObserverDelegate::RemoveObserverOnUIThread, this));
}
private:
friend class base::RefCountedThreadSafe<ScreenObserverDelegate>;
~ScreenObserverDelegate() override { DCHECK(!capture_device_); }
void OnDisplayAdded(const gfx::Display& /*new_display*/) override {}
void OnDisplayRemoved(const gfx::Display& /*old_display*/) override {}
void OnDisplayMetricsChanged(const gfx::Display& display,
uint32_t metrics) override {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
if (!(metrics & DISPLAY_METRIC_ROTATION))
return;
SendDisplayRotation(display);
}
void AddObserverOnUIThread() {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
gfx::Screen* screen = gfx::Screen::GetScreen();
if (screen) {
screen->AddObserver(this);
SendDisplayRotation(screen->GetPrimaryDisplay());
}
}
void RemoveObserverOnUIThread() {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
gfx::Screen* screen = gfx::Screen::GetScreen();
if (screen)
screen->RemoveObserver(this);
}
// Post the screen rotation change from the UI thread to capture thread
void SendDisplayRotation(const gfx::Display& display) {
DCHECK(ui_task_runner_->BelongsToCurrentThread());
capture_task_runner_->PostTask(
FROM_HERE,
base::Bind(&ScreenObserverDelegate::SendDisplayRotationOnCaptureThread,
this, display));
}
void SendDisplayRotationOnCaptureThread(const gfx::Display& display) {
DCHECK(capture_task_runner_->BelongsToCurrentThread());
if (capture_device_)
capture_device_->SetDisplayRotation(display);
}
VideoCaptureDeviceChromeOS* capture_device_;
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ScreenObserverDelegate);
};
VideoCaptureDeviceChromeOS::VideoCaptureDeviceChromeOS(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
const Name& device_name)
: VideoCaptureDeviceLinux(device_name),
screen_observer_delegate_(
new ScreenObserverDelegate(this, ui_task_runner)) {
}
VideoCaptureDeviceChromeOS::~VideoCaptureDeviceChromeOS() {
screen_observer_delegate_->RemoveObserver();
}
void VideoCaptureDeviceChromeOS::SetDisplayRotation(
const gfx::Display& display) {
if (display.IsInternal())
SetRotation(display.rotation() * 90);
}
} // namespace media
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