Detect change on the intersection of video and viewport.

third_party/WebKit/Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 316 matching lines @@
   void didMoveToNewDocument(Document& oldDocument) override;
   virtual KURL posterImageURL() const { return KURL(); }
 
   enum DisplayMode { Unknown, Poster, Video };
   DisplayMode getDisplayMode() const { return m_displayMode; }
   virtual void setDisplayMode(DisplayMode mode) { m_displayMode = mode; }
 
   void recordAutoplayMetric(AutoplayMetrics);
 
  private:
+  // Friend class for testing.
+  friend class MediaElementFillingViewportTest;
+
   void resetMediaPlayerAndMediaSource();
 
   bool alwaysCreateUserAgentShadowRoot() const final { return true; }
   bool areAuthorShadowsAllowed() const final { return false; }
 
   bool supportsFocus() const final;
   bool isMouseFocusable() const final;
   bool layoutObjectIsNeeded(const ComputedStyle&) override;
   LayoutObject* createLayoutObject(const ComputedStyle&) override;
   InsertionNotificationRequest insertedInto(ContainerNode*) final;
@@ skipping 190 matching lines @@
   void scheduleNotifyPlaying();
   void resolveScheduledPlayPromises();
   void rejectScheduledPlayPromises();
   void rejectPlayPromises(ExceptionCode, const String&);
   void rejectPlayPromisesInternal(ExceptionCode, const String&);
 
   EnumerationHistogram& showControlsHistogram() const;
 
   void onVisibilityChangedForAutoplay(bool isVisible);
 
+  void checkViewportIntersectionChanged();
+  void viewportFillDebouncerTimerFired(TimerBase*);
+
   UnthrottledThreadTimer<HTMLMediaElement> m_loadTimer;
   UnthrottledThreadTimer<HTMLMediaElement> m_progressEventTimer;
   UnthrottledThreadTimer<HTMLMediaElement> m_playbackProgressTimer;
   UnthrottledThreadTimer<HTMLMediaElement> m_audioTracksTimer;
+  UnthrottledThreadTimer<HTMLMediaElement> m_viewportFillDebouncerTimer;
   Member<TimeRanges> m_playedTimeRanges;
   Member<GenericEventQueue> m_asyncEventQueue;
 
   double m_playbackRate;
   double m_defaultPlaybackRate;
   NetworkState m_networkState;
   ReadyState m_readyState;
   ReadyState m_readyStateMaximum;
   KURL m_currentSrc;
   Member<MediaStreamDescriptor> m_srcObject;
@@ skipping 79 matching lines @@
 
   bool m_textTracksVisible : 1;
   bool m_shouldPerformAutomaticTrackSelection : 1;
 
   bool m_tracksAreReady : 1;
   bool m_processingPreferenceChange : 1;
   bool m_playingRemotely : 1;
   // Whether this element is in overlay fullscreen mode.
   bool m_inOverlayFullscreenVideo : 1;
 
+  bool m_mostlyFillingViewport : 1;
+
   TraceWrapperMember<AudioTrackList> m_audioTracks;
   TraceWrapperMember<VideoTrackList> m_videoTracks;
   TraceWrapperMember<TextTrackList> m_textTracks;
   HeapVector<Member<TextTrack>> m_textTracksWhenResourceSelectionBegan;
 
   Member<CueTimeline> m_cueTimeline;
 
   HeapVector<Member<ScriptPromiseResolver>> m_playPromiseResolvers;
   std::unique_ptr<CancellableTaskFactory> m_playPromiseResolveTask;
   std::unique_ptr<CancellableTaskFactory> m_playPromiseRejectTask;
@@ skipping 64 matching lines @@
 
   Member<AutoplayExperimentHelper::Client> m_autoplayHelperClient;
   Member<AutoplayExperimentHelper> m_autoplayHelper;
   Member<AutoplayUmaHelper> m_autoplayUmaHelper;
 
   WebRemotePlaybackClient* m_remotePlaybackClient;
 
   // class AutoplayVisibilityObserver;
   Member<ElementVisibilityObserver> m_autoplayVisibilityObserver;
 
+  IntRect m_currentIntersectRect;
+
   static URLRegistry* s_mediaStreamRegistry;
 };
 
 inline bool isHTMLMediaElement(const HTMLElement& element) {
   return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 }  // namespace blink
 
 #endif  // HTMLMediaElement_h