| // Copyright (c) 2012 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 "ash/wm/video_detector.h" |
| |
| #include "ash/shell.h" |
| #include "ash/wm/window_util.h" |
| #include "ui/aura/env.h" |
| #include "ui/aura/root_window.h" |
| #include "ui/aura/window.h" |
| #include "ui/gfx/rect.h" |
| |
| namespace ash { |
| |
| const int VideoDetector::kMinUpdateWidth = 333; |
| const int VideoDetector::kMinUpdateHeight = 250; |
| const int VideoDetector::kMinFramesPerSecond = 15; |
| const double VideoDetector::kNotifyIntervalSec = 1.0; |
| |
| // Stores information about updates to a window and determines whether it's |
| // likely that a video is playing in it. |
| class VideoDetector::WindowInfo { |
| public: |
| WindowInfo() : buffer_start_(0), buffer_size_(0) {} |
| |
| // Handles an update within a window, returning true if it appears that |
| // video is currently playing in the window. |
| bool RecordUpdateAndCheckForVideo(const gfx::Rect& region, |
| base::TimeTicks now) { |
| if (region.width() < kMinUpdateWidth || region.height() < kMinUpdateHeight) |
| return false; |
| |
| // If the buffer is full, drop the first timestamp. |
| if (buffer_size_ == static_cast<size_t>(kMinFramesPerSecond)) { |
| buffer_start_ = (buffer_start_ + 1) % kMinFramesPerSecond; |
| buffer_size_--; |
| } |
| |
| update_times_[(buffer_start_ + buffer_size_) % kMinFramesPerSecond] = now; |
| buffer_size_++; |
| |
| return buffer_size_ == static_cast<size_t>(kMinFramesPerSecond) && |
| (now - update_times_[buffer_start_]).InSecondsF() <= 1.0; |
| } |
| |
| private: |
| // Circular buffer containing update times of the last (up to |
| // |kMinFramesPerSecond|) video-sized updates to this window. |
| base::TimeTicks update_times_[kMinFramesPerSecond]; |
| |
| // Index into |update_times_| of the oldest update. |
| size_t buffer_start_; |
| |
| // Number of updates stored in |update_times_|. |
| size_t buffer_size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WindowInfo); |
| }; |
| |
| VideoDetector::VideoDetector() |
| : observer_manager_(this), |
| is_shutting_down_(false) { |
| aura::Env::GetInstance()->AddObserver(this); |
| Shell::GetInstance()->AddShellObserver(this); |
| } |
| |
| VideoDetector::~VideoDetector() { |
| Shell::GetInstance()->RemoveShellObserver(this); |
| aura::Env::GetInstance()->RemoveObserver(this); |
| } |
| |
| void VideoDetector::AddObserver(VideoDetectorObserver* observer) { |
| observers_.AddObserver(observer); |
| } |
| |
| void VideoDetector::RemoveObserver(VideoDetectorObserver* observer) { |
| observers_.RemoveObserver(observer); |
| } |
| |
| void VideoDetector::OnWindowInitialized(aura::Window* window) { |
| observer_manager_.Add(window); |
| } |
| |
| void VideoDetector::OnWindowPaintScheduled(aura::Window* window, |
| const gfx::Rect& region) { |
| if (is_shutting_down_) |
| return; |
| linked_ptr<WindowInfo>& info = window_infos_[window]; |
| if (!info.get()) |
| info.reset(new WindowInfo); |
| |
| base::TimeTicks now = |
| !now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now(); |
| if (info->RecordUpdateAndCheckForVideo(region, now)) |
| MaybeNotifyObservers(window, now); |
| } |
| |
| void VideoDetector::OnWindowDestroyed(aura::Window* window) { |
| window_infos_.erase(window); |
| observer_manager_.Remove(window); |
| } |
| |
| void VideoDetector::OnAppTerminating() { |
| // Stop checking video activity once the shutdown |
| // process starts. crbug.com/231696. |
| is_shutting_down_ = true; |
| } |
| |
| void VideoDetector::MaybeNotifyObservers(aura::Window* window, |
| base::TimeTicks now) { |
| if (!last_observer_notification_time_.is_null() && |
| (now - last_observer_notification_time_).InSecondsF() < |
| kNotifyIntervalSec) |
| return; |
| |
| if (!window->IsVisible()) |
| return; |
| |
| gfx::Rect root_bounds = window->GetRootWindow()->bounds(); |
| if (!window->GetBoundsInRootWindow().Intersects(root_bounds)) |
| return; |
| |
| aura::Window* toplevel_window = wm::GetActivatableWindow(window); |
| bool is_fullscreen = |
| toplevel_window ? wm::IsWindowFullscreen(toplevel_window) : false; |
| |
| FOR_EACH_OBSERVER(VideoDetectorObserver, |
| observers_, |
| OnVideoDetected(is_fullscreen)); |
| last_observer_notification_time_ = now; |
| } |
| |
| } // namespace ash |