Support edge-inclusive intersections in mapToVisibleRectInAncestorSpace

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1620 matching lines @@
 {
     return clippedOverflowRectForPaintInvalidation(view());
 }
 
 LayoutRect LayoutObject::clippedOverflowRectForPaintInvalidation(const LayoutBoxModelObject*, const PaintInvalidationState*) const
 {
     ASSERT_NOT_REACHED();
     return LayoutRect();
 }
 
-void LayoutObject::mapToVisibleRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect& rect, const PaintInvalidationState* paintInvalidationState) const
+bool LayoutObject::mapToVisibleRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect& rect, const PaintInvalidationState* paintInvalidationState, VisibleRectFlags visibleRectFlags) const
 {
+    // For any layout object that doesn't override this method (the main example is LayoutText),
+    // the rect is assumed to be in the coordinate space of the object's parent.
+
     if (ancestor == this)
-        return;
+        return true;
 
-    if (paintInvalidationState && paintInvalidationState->canMapToAncestor(ancestor)) {
-        paintInvalidationState->mapObjectRectToAncestor(*this, ancestor, rect);
-        return;
-    }
+    if (paintInvalidationState && paintInvalidationState->canMapToAncestor(ancestor))
+        return paintInvalidationState->mapObjectRectToAncestor(*this, ancestor, rect, visibleRectFlags);
 
     if (LayoutObject* parent = this->parent()) {
         if (parent->hasOverflowClip()) {
             LayoutBox* parentBox = toLayoutBox(parent);
             parentBox->mapScrollingContentsRectToBoxSpace(rect);
-            if (parent != ancestor)
-                parentBox->applyOverflowClip(rect);
-            if (rect.isEmpty())
-                return;
+            if (parent != ancestor && !parentBox->applyOverflowClip(rect, visibleRectFlags))
+                return false;
         }
 
-        parent->mapToVisibleRectInAncestorSpace(ancestor, rect, nullptr);
+        return parent->mapToVisibleRectInAncestorSpace(ancestor, rect, nullptr, visibleRectFlags);
     }
+    return true;
 }
 
 void LayoutObject::dirtyLinesFromChangedChild(LayoutObject*)
 {
 }
 
 #ifndef NDEBUG
 
 void LayoutObject::showTreeForThis() const
 {
@@ skipping 2064 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif