Intersection Observer support for OOPIF

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 13 matching lines @@
 */
 
 #ifndef FrameView_h
 #define FrameView_h
 
 #include "core/CoreExport.h"
 #include "core/dom/DocumentLifecycle.h"
 #include "core/frame/FrameViewAutoSizeInfo.h"
 #include "core/frame/LayoutSubtreeRootList.h"
 #include "core/frame/RootFrameViewport.h"
+#include "core/layout/MapCoordinatesFlags.h"
 #include "core/layout/ScrollAnchor.h"
 #include "core/paint/FirstMeaningfulPaintDetector.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintInvalidationCapableScrollableArea.h"
 #include "core/paint/PaintPhase.h"
 #include "core/paint/ScrollbarManager.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/Widget.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
@@ skipping 752 matching lines @@
   MainThreadScrollingReasons mainThreadScrollingReasons() const;
   // Main thread scrolling reasons for this object only. For all reasons,
   // see: mainThreadScrollingReasons().
   MainThreadScrollingReasons mainThreadScrollingReasonsPerFrame() const;
   void adjustStyleRelatedMainThreadScrollingReasons(const uint32_t reason,
                                                     bool increase);
   MainThreadScrollingReasons getStyleRelatedMainThreadScrollingReasons() const;
 
   bool hasVisibleSlowRepaintViewportConstrainedObjects() const;
 
+  // Called on a view for a LocalFrame with a RemoteFrame parent. This makes
+  // viewport intersection available that accounts for remote ancestor frames
+  // and their respective scroll positions, clips, etc.
+  void setViewportIntersectionFromParent(const IntRect&);
+  IntRect remoteViewportIntersection();
+
+  // This method uses localToAncestorQuad to map a rect into an ancestor's
+  // coordinate space, while guaranteeing that the top-level scroll offset
+  // is accounted for. This is needed because LayoutView::mapLocalToAncestor()
+  // implicitly includes the ancestor frame's scroll offset when there is
+  // a remote frame in the ancestor chain, but does not include it when
+  // there are only local frames in the frame tree.
+  void mapQuadToAncestorFrameIncludingScrollOffset(

[dcheng, 2017/01/05 07:10:19]

Can we inline this directly, since it's only used from one place?

[szager1, 2017/01/05 20:25:22]

This is a generally useful method, I expect it to be used elsewhere in the
future.

+      LayoutRect&,
+      const LayoutObject* descendant,
+      const LayoutView* ancestor,
+      MapCoordinatesFlags mode);
+
  protected:
   // Scroll the content via the compositor.
   bool scrollContentsFastPath(const IntSize& scrollDelta);
 
   // Scroll the content by invalidating everything.
   void scrollContentsSlowPath();
 
   ScrollBehavior scrollBehaviorStyle() const override;
 
   void scrollContentsIfNeeded();
@@ skipping 333 matching lines @@
 
   // ScrollbarManager holds the Scrollbar instances.
   ScrollbarManager m_scrollbarManager;
 
   bool m_needsScrollbarsUpdate;
   bool m_suppressAdjustViewSize;
   bool m_allowsLayoutInvalidationAfterLayoutClean;
 
   Member<ElementVisibilityObserver> m_visibilityObserver;
 
+  IntRect m_remoteViewportIntersection;
+
   // For testing.
   struct ObjectPaintInvalidation {
     String name;
     PaintInvalidationReason reason;
   };
   std::unique_ptr<Vector<ObjectPaintInvalidation>>
       m_trackedObjectPaintInvalidations;
 
   // For Slimming Paint v2 only.
   std::unique_ptr<PaintController> m_paintController;
@@ skipping 39 matching lines @@
                   widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h