Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/rendering/RenderObject.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 37 matching lines @@
 #include "core/page/Page.h"
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/rendering/CompositedLayerMapping.h"
 #include "core/rendering/FlowThreadController.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/LayoutRectRecorder.h"
 #include "core/rendering/RenderCounter.h"
 #include "core/rendering/RenderDeprecatedFlexibleBox.h"
 #include "core/rendering/RenderFlexibleBox.h"
+#include "core/rendering/RenderFlowThread.h"
 #include "core/rendering/RenderGeometryMap.h"
 #include "core/rendering/RenderGrid.h"
 #include "core/rendering/RenderImage.h"
 #include "core/rendering/RenderImageResourceStyleImage.h"
 #include "core/rendering/RenderInline.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderLayerCompositor.h"
 #include "core/rendering/RenderListItem.h"
 #include "core/rendering/RenderMarquee.h"
 #include "core/rendering/RenderMultiColumnBlock.h"
-#include "core/rendering/RenderNamedFlowThread.h"
-#include "core/rendering/RenderRegion.h"
 #include "core/rendering/RenderScrollbarPart.h"
 #include "core/rendering/RenderTableCaption.h"
 #include "core/rendering/RenderTableCell.h"
 #include "core/rendering/RenderTableCol.h"
 #include "core/rendering/RenderTableRow.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/style/ContentData.h"
 #include "core/rendering/style/CursorList.h"
 #include "core/rendering/style/ShadowList.h"
@@ skipping 520 matching lines @@
     // Not in the middle of layout so have to find the thread the slow way.
     RenderObject* curr = const_cast<RenderObject*>(this);
     while (curr) {
         if (curr->isRenderFlowThread())
             return toRenderFlowThread(curr);
         curr = curr->containingBlock();
     }
     return 0;
 }
 
-RenderNamedFlowThread* RenderObject::renderNamedFlowThreadWrapper() const
-{
-    RenderObject* object = const_cast<RenderObject*>(this);
-    while (object && object->isAnonymousBlock() && !object->isRenderNamedFlowThread())
-        object = object->parent();
-
-    return object && object->isRenderNamedFlowThread() ? toRenderNamedFlowThread(object) : 0;
-}
-
 RenderBlock* RenderObject::firstLineBlock() const
 {
     return 0;
 }
 
 static inline bool objectIsRelayoutBoundary(const RenderObject* object)
 {
     // FIXME: In future it may be possible to broaden these conditions in order to improve performance.
     if (object->isTextControl())
         return true;
@@ skipping 1929 matching lines @@
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->childrenChanged(this->parent());
 
     remove();
 
     // The remove() call above may invoke axObjectCache()->childrenChanged() on the parent, which may require the AX render
     // object for this renderer. So we remove the AX render object now, after the renderer is removed.
     if (AXObjectCache* cache = document().existingAXObjectCache())
         cache->remove(this);
 
-#ifndef NDEBUG
-    if (!documentBeingDestroyed() && view() && view()->hasRenderNamedFlowThreads()) {
-        // After remove, the object and the associated information should not be in any flow thread.
-        const RenderNamedFlowThreadList* flowThreadList = view()->flowThreadController()->renderNamedFlowThreadList();
-        for (RenderNamedFlowThreadList::const_iterator iter = flowThreadList->begin(); iter != flowThreadList->end(); ++iter) {
-            const RenderNamedFlowThread* renderFlowThread = *iter;
-            ASSERT(!renderFlowThread->hasChild(this));
-            ASSERT(!renderFlowThread->hasChildInfo(this));
-        }
-    }
-#endif
-
     // If this renderer had a parent, remove should have destroyed any counters
     // attached to this renderer and marked the affected other counters for
     // reevaluation. This apparently redundant check is here for the case when
     // this renderer had no parent at the time remove() was called.
 
     if (hasCounterNodeMap())
         RenderCounter::destroyCounterNodes(*this);
 
     setAncestorLineBoxDirty(false);
 
@@ skipping 16 matching lines @@
     // that needs to be drawn and layer visibility optimization can't be used
     if (parent()->style()->visibility() != VISIBLE && style()->visibility() == VISIBLE && !hasLayer()) {
         if (!layer)
             layer = parent()->enclosingLayer();
         if (layer)
             layer->setHasVisibleContent();
     }
 
     if (!isFloating() && parent()->childrenInline())
         parent()->dirtyLinesFromChangedChild(this);
-
-    if (RenderNamedFlowThread* containerFlowThread = parent()->renderNamedFlowThreadWrapper())
-        containerFlowThread->addFlowChild(this);
 }
 
 void RenderObject::willBeRemovedFromTree()
 {
     // FIXME: We should ASSERT(isRooted()) but we have some out-of-order removals which would need to be fixed first.
 
     // If we remove a visible child from an invisible parent, we don't know the layer visibility any more.
     RenderLayer* layer = 0;
     if (parent()->style()->visibility() != VISIBLE && style()->visibility() == VISIBLE && !hasLayer()) {
         if ((layer = parent()->enclosingLayer()))
             layer->dirtyVisibleContentStatus();
     }
 
     // Keep our layer hierarchy updated.
     if (firstChild() || hasLayer()) {
         if (!layer)
             layer = parent()->enclosingLayer();
         removeLayers(layer);
     }
 
     if (isOutOfFlowPositioned() && parent()->childrenInline())
         parent()->dirtyLinesFromChangedChild(this);
 
     removeFromRenderFlowThread();
 
-    if (RenderNamedFlowThread* containerFlowThread = parent()->renderNamedFlowThreadWrapper())
-        containerFlowThread->removeFlowChild(this);
-
     // Update cached boundaries in SVG renderers if a child is removed.
     if (parent()->isSVG())
         parent()->setNeedsBoundariesUpdate();
 }
 
 void RenderObject::removeFromRenderFlowThread()
 {
     if (flowThreadState() == NotInsideFlowThread)
         return;
 
     // Sometimes we remove the element from the flow, but it's not destroyed at that time.
     // It's only until later when we actually destroy it and remove all the children from it.
     // Currently, that happens for firstLetter elements and list markers.
     // Pass in the flow thread so that we don't have to look it up for all the children.
     removeFromRenderFlowThreadRecursive(flowThreadContainingBlock());
 }
 
 void RenderObject::removeFromRenderFlowThreadRecursive(RenderFlowThread* renderFlowThread)
 {
     if (const RenderObjectChildList* children = virtualChildren()) {
         for (RenderObject* child = children->firstChild(); child; child = child->nextSibling())
             child->removeFromRenderFlowThreadRecursive(renderFlowThread);
     }
 
-    RenderFlowThread* localFlowThread = renderFlowThread;
-    if (flowThreadState() == InsideInFlowThread)
-        localFlowThread = flowThreadContainingBlock(); // We have to ask. We can't just assume we are in the same flow thread.
-    if (localFlowThread)
-        localFlowThread->removeFlowChildInfo(this);
     setFlowThreadState(NotInsideFlowThread);
 }
 
 void RenderObject::destroyAndCleanupAnonymousWrappers()
 {
     // If the tree is destroyed, there is no need for a clean-up phase.
     if (documentBeingDestroyed()) {
         destroy();
         return;
     }
@@ skipping 441 matching lines @@
     while (!renderer->node())
         renderer = renderer->parent();
     return renderer->node()->isInert();
 }
 
 void RenderObject::imageChanged(ImageResource* image, const IntRect* rect)
 {
     imageChanged(static_cast<WrappedImagePtr>(image), rect);
 }
 
-RenderObject* RenderObject::hoverAncestor() const
-{
-    // When searching for the hover ancestor and encountering a named flow thread,
-    // the search will continue with the DOM ancestor of the top-most element
-    // in the named flow thread.
-    // See https://code.google.com/p/chromium/issues/detail?id=243278
-    RenderObject* hoverAncestor = parent();
-
-    // Skip anonymous blocks directly flowed into flow threads as it would
-    // prevent us from continuing the search on the DOM tree when reaching the named flow thread.
-    if (hoverAncestor && hoverAncestor->isAnonymousBlock() && hoverAncestor->parent() && hoverAncestor->parent()->isRenderNamedFlowThread())
-        hoverAncestor = hoverAncestor->parent();
-
-    if (hoverAncestor && hoverAncestor->isRenderNamedFlowThread()) {
-        hoverAncestor = 0;
-
-        Node* node = this->node();
-        if (node) {
-            Node* domAncestorNode = node->parentNode();
-            if (domAncestorNode)
-                hoverAncestor = domAncestorNode->renderer();
-        }
-    }
-
-    return hoverAncestor;
-}
-
 Element* RenderObject::offsetParent() const
 {
     if (isRoot() || isBody())
         return 0;
 
     if (isOutOfFlowPositioned() && style()->position() == FixedPosition)
         return 0;
 
     // If A is an area HTML element which has a map HTML element somewhere in the ancestor
     // chain return the nearest ancestor map HTML element and stop this algorithm.
     // FIXME: Implement!
 
     float effectiveZoom = style()->effectiveZoom();
     Node* node = 0;
     for (RenderObject* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
         // Spec: http://www.w3.org/TR/cssom-view/#offset-attributes
 
-        // CSS regions specification says that region flows should return the body element as their offsetParent.
-        if (ancestor->isRenderNamedFlowThread())
-            return document().body();
-
         node = ancestor->node();
 
         if (!node)
             continue;
 
         if (ancestor->isPositioned())
             break;
 
         if (node->hasTagName(bodyTag))
             break;
@@ skipping 137 matching lines @@
 {
     ASSERT_NOT_REACHED();
     return false;
 }
 
 bool RenderObject::isRelayoutBoundaryForInspector() const
 {
     return objectIsRelayoutBoundary(this);
 }
 
-bool RenderObject::isRenderNamedFlowFragmentContainer() const
-{
-    return isRenderBlockFlow() && toRenderBlockFlow(this)->renderNamedFlowFragment();
-}
-
 } // namespace WebCore
 
 #ifndef NDEBUG
 
 void showTree(const WebCore::RenderObject* object)
 {
     if (object)
         object->showTreeForThis();
 }
 
@@ skipping 12 matching lines @@
 {
     if (object1) {
         const WebCore::RenderObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showRenderTreeAndMark(object1, "*", object2, "-", 0);
     }
 }
 
 #endif