Detect change on the intersection of video and viewport.

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

 /*
  * 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 21 matching lines @@
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/ScriptEventListener.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/HTMLNames.h"
 #include "core/css/MediaList.h"
 #include "core/dom/Attribute.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ElementVisibilityObserver.h"
 #include "core/dom/Fullscreen.h"
+#include "core/dom/IntersectionGeometry.h"
 #include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/events/Event.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/AutoplayUmaHelper.h"
 #include "core/html/HTMLMediaSource.h"
@@ skipping 2445 matching lines @@
 void HTMLMediaElement::startPlaybackProgressTimer() {
   if (m_playbackProgressTimer.isActive())
     return;
 
   m_previousProgressTime = WTF::currentTime();
   m_playbackProgressTimer.startRepeating(maxTimeupdateEventFrequency,
                                          BLINK_FROM_HERE);
 }
 
 void HTMLMediaElement::playbackProgressTimerFired(TimerBase*) {
+  if (m_webMediaPlayer) {
+    // Check whether the intersection with viewport has changed.
+    ExecutionContext* context = getExecutionContext();
+    DCHECK(context->isDocument());
+    Document& document = toDocument(*context);
+    IntersectionGeometry geometry(&document, this, Vector<Length>(), true);
+    geometry.computeGeometry();
+    WebRect intersectRect = geometry.intersectionIntRect();
+    if (m_currentViewportIntersection.intersectRect != intersectRect) {
+      m_currentViewportIntersection.intersectRect = intersectRect;
+      m_currentViewportIntersection.rootRect = geometry.rootIntRect();
+      m_webMediaPlayer->viewportIntersectionChanged(
+          m_currentViewportIntersection);
+    }
+  }
+
   if (!std::isnan(m_fragmentEndTime) && currentTime() >= m_fragmentEndTime &&
       getDirectionOfPlayback() == Forward) {
     m_fragmentEndTime = std::numeric_limits<double>::quiet_NaN();
     if (!m_paused) {
       UseCounter::count(document(),
                         UseCounter::HTMLMediaElementPauseAtFragmentEnd);
       // changes paused to true and fires a simple event named pause at the
       // media element.
       pauseInternal();
     }
@@ skipping 1670 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect()
     const {
   IntRect result;
   if (LayoutObject* object = m_element->layoutObject())
     result = object->absoluteBoundingBoxRect();
   return result;
 }
 
 }  // namespace blink