Convert RenderBlockFlow code to use FloatingObject references

Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 877 matching lines @@
 void LayoutBlockFlow::rebuildFloatsFromIntruding()
 {
     if (m_floatingObjects)
         m_floatingObjects->setHorizontalWritingMode(isHorizontalWritingMode());
 
     HashSet<LayoutBox*> oldIntrudingFloatSet;
     if (!childrenInline() && m_floatingObjects) {
         const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
         FloatingObjectSetIterator end = floatingObjectSet.end();
         for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-            FloatingObject* floatingObject = it->get();
-            if (!floatingObject->isDescendant())
-                oldIntrudingFloatSet.add(floatingObject->layoutObject());
+            const FloatingObject& floatingObject = *it->get();
+            if (!floatingObject.isDescendant())
+                oldIntrudingFloatSet.add(floatingObject.layoutObject());
         }
     }
 
     // Inline blocks are covered by the isReplaced() check in the avoidFloats method.
     if (avoidsFloats() || isDocumentElement() || isLayoutView() || isFloatingOrOutOfFlowPositioned() || isTableCell()) {
         if (m_floatingObjects) {
             m_floatingObjects->clear();
         }
         if (!oldIntrudingFloatSet.isEmpty())
             markAllDescendantsWithFloatsForLayout();
@@ skipping 42 matching lines @@
             addIntrudingFloats(blockFlow, 0, logicalTopOffset);
     }
 
     if (childrenInline()) {
         LayoutUnit changeLogicalTop = LayoutUnit::max();
         LayoutUnit changeLogicalBottom = LayoutUnit::min();
         if (m_floatingObjects) {
             const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
             FloatingObjectSetIterator end = floatingObjectSet.end();
             for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-                FloatingObject* floatingObject = it->get();
-                FloatingObject* oldFloatingObject = floatMap.get(floatingObject->layoutObject());
+                const FloatingObject& floatingObject = *it->get();
+                FloatingObject* oldFloatingObject = floatMap.get(floatingObject.layoutObject());
                 LayoutUnit logicalBottom = logicalBottomForFloat(floatingObject);
                 if (oldFloatingObject) {
-                    LayoutUnit oldLogicalBottom = logicalBottomForFloat(oldFloatingObject);
-                    if (logicalWidthForFloat(floatingObject) != logicalWidthForFloat(oldFloatingObject) || logicalLeftForFloat(floatingObject) != logicalLeftForFloat(oldFloatingObject)) {
+                    LayoutUnit oldLogicalBottom = logicalBottomForFloat(*oldFloatingObject);
+                    if (logicalWidthForFloat(floatingObject) != logicalWidthForFloat(*oldFloatingObject) || logicalLeftForFloat(floatingObject) != logicalLeftForFloat(*oldFloatingObject)) {
                         changeLogicalTop = 0;
                         changeLogicalBottom = std::max(changeLogicalBottom, std::max(logicalBottom, oldLogicalBottom));
                     } else {
                         if (logicalBottom != oldLogicalBottom) {
                             changeLogicalTop = std::min(changeLogicalTop, std::min(logicalBottom, oldLogicalBottom));
                             changeLogicalBottom = std::max(changeLogicalBottom, std::max(logicalBottom, oldLogicalBottom));
                         }
                         LayoutUnit logicalTop = logicalTopForFloat(floatingObject);
-                        LayoutUnit oldLogicalTop = logicalTopForFloat(oldFloatingObject);
+                        LayoutUnit oldLogicalTop = logicalTopForFloat(*oldFloatingObject);
                         if (logicalTop != oldLogicalTop) {
                             changeLogicalTop = std::min(changeLogicalTop, std::min(logicalTop, oldLogicalTop));
                             changeLogicalBottom = std::max(changeLogicalBottom, std::max(logicalTop, oldLogicalTop));
                         }
                     }
 
                     if (oldFloatingObject->originatingLine() && !selfNeedsLayout()) {
                         ASSERT(oldFloatingObject->originatingLine()->layoutObject() == this);
                         oldFloatingObject->originatingLine()->markDirty();
                     }
 
-                    floatMap.remove(floatingObject->layoutObject());
+                    floatMap.remove(floatingObject.layoutObject());
                 } else {
                     changeLogicalTop = 0;
                     changeLogicalBottom = std::max(changeLogicalBottom, logicalBottom);
                 }
             }
         }
 
         LayoutBoxToFloatInfoMap::iterator end = floatMap.end();
         for (LayoutBoxToFloatInfoMap::iterator it = floatMap.begin(); it != end; ++it) {
             OwnPtr<FloatingObject>& floatingObject = it->value;
             if (!floatingObject->isDescendant()) {
                 changeLogicalTop = 0;
-                changeLogicalBottom = std::max(changeLogicalBottom, logicalBottomForFloat(floatingObject.get()));
+                changeLogicalBottom = std::max(changeLogicalBottom, logicalBottomForFloat(*floatingObject));
             }
         }
 
         markLinesDirtyInBlockRange(changeLogicalTop, changeLogicalBottom);
     } else if (!oldIntrudingFloatSet.isEmpty()) {
         // If there are previously intruding floats that no longer intrude, then children with floats
         // should also get layout because they might need their floating object lists cleared.
         if (m_floatingObjects->set().size() < oldIntrudingFloatSet.size()) {
             markAllDescendantsWithFloatsForLayout();
         } else {
@@ skipping 766 matching lines @@
 }
 
 void LayoutBlockFlow::addOverflowFromFloats()
 {
     if (!m_floatingObjects)
         return;
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator end = floatingObjectSet.end();
     for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-        FloatingObject* floatingObject = it->get();
-        if (floatingObject->isDescendant())
-            addOverflowFromChild(floatingObject->layoutObject(), LayoutSize(xPositionForFloatIncludingMargin(floatingObject), yPositionForFloatIncludingMargin(floatingObject)));
+        const FloatingObject& floatingObject = *it->get();
+        if (floatingObject.isDescendant())
+            addOverflowFromChild(floatingObject.layoutObject(), LayoutSize(xPositionForFloatIncludingMargin(floatingObject), yPositionForFloatIncludingMargin(floatingObject)));
     }
 }
 
 void LayoutBlockFlow::computeOverflow(LayoutUnit oldClientAfterEdge, bool recomputeFloats)
 {
     LayoutBlock::computeOverflow(oldClientAfterEdge, recomputeFloats);
     if (!hasColumns() && (recomputeFloats || createsNewFormattingContext() || hasSelfPaintingLayer()))
         addOverflowFromFloats();
 }
 
@@ skipping 245 matching lines @@
     // displayed.
     // See bug https://code.google.com/p/chromium/issues/detail?id=230907
     if (m_floatingObjects) {
         if (!toBlockFlow->m_floatingObjects)
             toBlockFlow->createFloatingObjects();
 
         const FloatingObjectSet& fromFloatingObjectSet = m_floatingObjects->set();
         FloatingObjectSetIterator end = fromFloatingObjectSet.end();
 
         for (FloatingObjectSetIterator it = fromFloatingObjectSet.begin(); it != end; ++it) {
-            FloatingObject* floatingObject = it->get();
+            const FloatingObject& floatingObject = *it->get();
 
             // Don't insert the object again if it's already in the list
-            if (toBlockFlow->containsFloat(floatingObject->layoutObject()))
+            if (toBlockFlow->containsFloat(floatingObject.layoutObject()))
                 continue;
 
-            toBlockFlow->m_floatingObjects->add(floatingObject->unsafeClone());
+            toBlockFlow->m_floatingObjects->add(floatingObject.unsafeClone());
         }
     }
 
 }
 
 void LayoutBlockFlow::invalidatePaintForOverhangingFloats(bool paintAllDescendants)
 {
     // Invalidate paint of any overhanging floats (if we know we're the one to paint them).
     // Otherwise, bail out.
     if (!hasOverhangingFloats())
         return;
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator end = floatingObjectSet.end();
     for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-        FloatingObject* floatingObject = it->get();
+        const FloatingObject& floatingObject = *it->get();
         // Only issue paint invaldiations for the object if it is overhanging, is not in its own layer, and
         // is our responsibility to paint (m_shouldPaint is set). When paintAllDescendants is true, the latter
         // condition is replaced with being a descendant of us.
         if (logicalBottomForFloat(floatingObject) > logicalHeight()
-            && !floatingObject->layoutObject()->hasSelfPaintingLayer()
-            && (floatingObject->shouldPaint() || (paintAllDescendants && floatingObject->layoutObject()->isDescendantOf(this)))) {
+            && !floatingObject.layoutObject()->hasSelfPaintingLayer()
+            && (floatingObject.shouldPaint() || (paintAllDescendants && floatingObject.layoutObject()->isDescendantOf(this)))) {
 
-            LayoutBox* floatingLayoutBox = floatingObject->layoutObject();
+            LayoutBox* floatingLayoutBox = floatingObject.layoutObject();
             floatingLayoutBox->setShouldDoFullPaintInvalidation();
             floatingLayoutBox->invalidatePaintForOverhangingFloats(false);
         }
     }
 }
 
 void LayoutBlockFlow::invalidatePaintForOverflow()
 {
     // FIXME: We could tighten up the left and right invalidation points if we let layoutInlineChildren fill them in based off the particular lines
     // it had to lay out. We wouldn't need the hasOverflowClip() hack in that case either.
@@ skipping 50 matching lines @@
 
 void LayoutBlockFlow::clipOutFloatingObjects(const LayoutBlock* rootBlock, ClipScope& clipScope,
     const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock) const
 {
     if (!m_floatingObjects)
         return;
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator end = floatingObjectSet.end();
     for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-        FloatingObject* floatingObject = it->get();
-        LayoutRect floatBox(LayoutPoint(offsetFromRootBlock), floatingObject->layoutObject()->size());
+        const FloatingObject& floatingObject = *it->get();
+        LayoutRect floatBox(LayoutPoint(offsetFromRootBlock), floatingObject.layoutObject()->size());
         floatBox.move(positionForFloatIncludingMargin(floatingObject));
         rootBlock->flipForWritingMode(floatBox);
         floatBox.move(rootBlockPhysicalPosition.x(), rootBlockPhysicalPosition.y());
 
         clipScope.clip(floatBox, SkRegion::kDifference_Op);
     }
 }
 
 void LayoutBlockFlow::clearFloats(EClear clear)
 {
@@ skipping 24 matching lines @@
 void LayoutBlockFlow::removeFloatingObjects()
 {
     if (!m_floatingObjects)
         return;
 
     markSiblingsWithFloatsForLayout();
 
     m_floatingObjects->clear();
 }
 
-LayoutPoint LayoutBlockFlow::flipFloatForWritingModeForChild(const FloatingObject* child, const LayoutPoint& point) const
+LayoutPoint LayoutBlockFlow::flipFloatForWritingModeForChild(const FloatingObject& child, const LayoutPoint& point) const
 {
     if (!style()->isFlippedBlocksWritingMode())
         return point;
 
     // This is similar to LayoutBox::flipForWritingModeForChild. We have to subtract out our left/top offsets twice, since
     // it's going to get added back in. We hide this complication here so that the calling code looks normal for the unflipped
     // case.
     if (isHorizontalWritingMode())
-        return LayoutPoint(point.x(), point.y() + size().height() - child->layoutObject()->size().height() - 2 * yPositionForFloatIncludingMargin(child));
-    return LayoutPoint(point.x() + size().width() - child->layoutObject()->size().width() - 2 * xPositionForFloatIncludingMargin(child), point.y());
+        return LayoutPoint(point.x(), point.y() + size().height() - child.layoutObject()->size().height() - 2 * yPositionForFloatIncludingMargin(child));
+    return LayoutPoint(point.x() + size().width() - child.layoutObject()->size().width() - 2 * xPositionForFloatIncludingMargin(child), point.y());
 }
 
 LayoutUnit LayoutBlockFlow::logicalLeftOffsetForPositioningFloat(LayoutUnit logicalTop, LayoutUnit fixedOffset, bool applyTextIndent, LayoutUnit* heightRemaining) const
 {
     LayoutUnit offset = fixedOffset;
     if (m_floatingObjects && m_floatingObjects->hasLeftObjects())
         offset = m_floatingObjects->logicalLeftOffsetForPositioningFloat(fixedOffset, logicalTop, heightRemaining);
     return adjustLogicalLeftOffsetForLine(offset, applyTextIndent);
 }
 
@@ skipping 18 matching lines @@
 LayoutUnit LayoutBlockFlow::adjustLogicalRightOffsetForLine(LayoutUnit offsetFromFloats, bool applyTextIndent) const
 {
     LayoutUnit right = offsetFromFloats;
 
     if (applyTextIndent && !style()->isLeftToRightDirection())
         right -= textIndentOffset();
 
     return right;
 }
 
-LayoutPoint LayoutBlockFlow::computeLogicalLocationForFloat(const FloatingObject* floatingObject, LayoutUnit logicalTopOffset) const
+LayoutPoint LayoutBlockFlow::computeLogicalLocationForFloat(const FloatingObject& floatingObject, LayoutUnit logicalTopOffset) const
 {
-    LayoutBox* childBox = floatingObject->layoutObject();
+    LayoutBox* childBox = floatingObject.layoutObject();
     LayoutUnit logicalLeftOffset = logicalLeftOffsetForContent(); // Constant part of left offset.
     LayoutUnit logicalRightOffset; // Constant part of right offset.
     logicalRightOffset = logicalRightOffsetForContent();
 
     LayoutUnit floatLogicalWidth = std::min(logicalWidthForFloat(floatingObject), logicalRightOffset - logicalLeftOffset); // The width we look for.
 
     LayoutUnit floatLogicalLeft;
 
     bool insideFlowThread = flowThreadContainingBlock();
 
@@ skipping 61 matching lines @@
         floatBox.setChildNeedsLayout(MarkOnlyThis);
 
     bool needsBlockDirectionLocationSetBeforeLayout = isChildLayoutBlock && view()->layoutState()->needsBlockDirectionLocationSetBeforeLayout();
     if (!needsBlockDirectionLocationSetBeforeLayout || isWritingModeRoot()) { // We are unsplittable if we're a block flow root.
         floatBox.layoutIfNeeded();
     } else {
         floatBox.updateLogicalWidth();
         floatBox.computeAndSetBlockDirectionMargins(this);
     }
 
-    setLogicalWidthForFloat(newObj.get(), logicalWidthForChild(floatBox) + marginStartForChild(floatBox) + marginEndForChild(floatBox));
+    setLogicalWidthForFloat(*newObj, logicalWidthForChild(floatBox) + marginStartForChild(floatBox) + marginEndForChild(floatBox));
 
     return m_floatingObjects->add(newObj.release());
 }
 
 void LayoutBlockFlow::removeFloatingObject(LayoutBox* floatBox)
 {
     if (m_floatingObjects) {
         const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
         FloatingObjectSetIterator it = floatingObjectSet.find<FloatingObjectHashTranslator>(floatBox);
         if (it != floatingObjectSet.end()) {
-            FloatingObject* floatingObject = it->get();
+            FloatingObject& floatingObject = *it->get();
             if (childrenInline()) {
                 LayoutUnit logicalTop = logicalTopForFloat(floatingObject);
                 LayoutUnit logicalBottom = logicalBottomForFloat(floatingObject);
 
                 // Fix for https://bugs.webkit.org/show_bug.cgi?id=54995.
                 if (logicalBottom < 0 || logicalBottom < logicalTop || logicalTop == LayoutUnit::max()) {
                     logicalBottom = LayoutUnit::max();
                 } else {
                     // Special-case zero- and less-than-zero-height floats: those don't touch
                     // the line that they're on, but it still needs to be dirtied. This is
                     // accomplished by pretending they have a height of 1.
                     logicalBottom = std::max(logicalBottom, logicalTop + 1);
                 }
-                if (floatingObject->originatingLine()) {
+                if (floatingObject.originatingLine()) {
                     if (!selfNeedsLayout()) {
-                        ASSERT(floatingObject->originatingLine()->layoutObject() == this);
-                        floatingObject->originatingLine()->markDirty();
+                        ASSERT(floatingObject.originatingLine()->layoutObject() == this);
+                        floatingObject.originatingLine()->markDirty();
                     }
 #if ENABLE(ASSERT)
-                    floatingObject->setOriginatingLine(0);
+                    floatingObject.setOriginatingLine(0);
 #endif
                 }
                 markLinesDirtyInBlockRange(0, logicalBottom);
             }
-            m_floatingObjects->remove(floatingObject);
+            m_floatingObjects->remove(&floatingObject);
         }
     }
 }
 
 void LayoutBlockFlow::removeFloatingObjectsBelow(FloatingObject* lastFloat, int logicalOffset)
 {
     if (!containsFloats())
         return;
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObject* curr = floatingObjectSet.last().get();
-    while (curr != lastFloat && (!curr->isPlaced() || logicalTopForFloat(curr) >= logicalOffset)) {
+    while (curr != lastFloat && (!curr->isPlaced() || logicalTopForFloat(*curr) >= logicalOffset)) {
         m_floatingObjects->remove(curr);
         if (floatingObjectSet.isEmpty())
             break;
         curr = floatingObjectSet.last().get();
     }
 }
 
 bool LayoutBlockFlow::positionNewFloats(LineWidth* width)
 {
     if (!m_floatingObjects)
@@ skipping 20 matching lines @@
             lastPlacedFloatingObject = it->get();
             ++it;
             break;
         }
     }
 
     LayoutUnit logicalTop = logicalHeight();
 
     // The float cannot start above the top position of the last positioned float.
     if (lastPlacedFloatingObject)
-        logicalTop = std::max(logicalTopForFloat(lastPlacedFloatingObject), logicalTop);
+        logicalTop = std::max(logicalTopForFloat(*lastPlacedFloatingObject), logicalTop);
 
     FloatingObjectSetIterator end = floatingObjectSet.end();
     // Now walk through the set of unpositioned floats and place them.
     for (; it != end; ++it) {
-        FloatingObject* floatingObject = it->get();
+        FloatingObject& floatingObject = *it->get();
         // The containing block is responsible for positioning floats, so if we have floats in our
         // list that come from somewhere else, do not attempt to position them.
-        if (floatingObject->layoutObject()->containingBlock() != this)
+        if (floatingObject.layoutObject()->containingBlock() != this)
             continue;
 
-        LayoutBox* childBox = floatingObject->layoutObject();
+        LayoutBox* childBox = floatingObject.layoutObject();
 
         // FIXME Investigate if this can be removed. crbug.com/370006
         childBox->setMayNeedPaintInvalidation();
 
         LayoutUnit childLogicalLeftMargin = style()->isLeftToRightDirection() ? marginStartForChild(*childBox) : marginEndForChild(*childBox);
         if (childBox->style()->clear() & CLEFT)
             logicalTop = std::max(lowestFloatLogicalBottom(FloatingObject::FloatLeft), logicalTop);
         if (childBox->style()->clear() & CRIGHT)
             logicalTop = std::max(lowestFloatLogicalBottom(FloatingObject::FloatRight), logicalTop);
 
@@ skipping 20 matching lines @@
             // See if we have a pagination strut that is making us move down further.
             // Note that an unsplittable child can't also have a pagination strut, so this is
             // exclusive with the case above.
             LayoutBlockFlow* childBlockFlow = childBox->isLayoutBlockFlow() ? toLayoutBlockFlow(childBox) : 0;
             if (childBlockFlow && childBlockFlow->paginationStrut()) {
                 newLogicalTop += childBlockFlow->paginationStrut();
                 childBlockFlow->setPaginationStrut(0);
             }
 
             if (newLogicalTop != floatLogicalLocation.y()) {
-                floatingObject->setPaginationStrut(newLogicalTop - floatLogicalLocation.y());
+                floatingObject.setPaginationStrut(newLogicalTop - floatLogicalLocation.y());
 
                 floatLogicalLocation = computeLogicalLocationForFloat(floatingObject, newLogicalTop);
                 setLogicalLeftForFloat(floatingObject, floatLogicalLocation.x());
 
                 setLogicalLeftForChild(*childBox, floatLogicalLocation.x() + childLogicalLeftMargin);
                 setLogicalTopForChild(*childBox, floatLogicalLocation.y() + marginBeforeForChild(*childBox));
 
                 if (childBox->isLayoutBlock())
                     childBox->setChildNeedsLayout(MarkOnlyThis);
                 childBox->layoutIfNeeded();
@@ skipping 18 matching lines @@
 bool LayoutBlockFlow::hasOverhangingFloat(LayoutBox* layoutBox)
 {
     if (!m_floatingObjects || hasColumns() || !parent())
         return false;
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator it = floatingObjectSet.find<FloatingObjectHashTranslator>(layoutBox);
     if (it == floatingObjectSet.end())
         return false;
 
-    return logicalBottomForFloat(it->get()) > logicalHeight();
+    return logicalBottomForFloat(*it->get()) > logicalHeight();
 }
 
 void LayoutBlockFlow::addIntrudingFloats(LayoutBlockFlow* prev, LayoutUnit logicalLeftOffset, LayoutUnit logicalTopOffset)
 {
     ASSERT(!avoidsFloats());
 
     // If we create our own block formatting context then our contents don't interact with floats outside it, even those from our parent.
     if (createsNewFormattingContext())
         return;
 
     // If the parent or previous sibling doesn't have any floats to add, don't bother.
     if (!prev->m_floatingObjects)
         return;
 
     logicalLeftOffset += marginLogicalLeft();
 
     const FloatingObjectSet& prevSet = prev->m_floatingObjects->set();
     FloatingObjectSetIterator prevEnd = prevSet.end();
     for (FloatingObjectSetIterator prevIt = prevSet.begin(); prevIt != prevEnd; ++prevIt) {
-        FloatingObject* floatingObject = prevIt->get();
+        FloatingObject& floatingObject = *prevIt->get();
         if (logicalBottomForFloat(floatingObject) > logicalTopOffset) {
-            if (!m_floatingObjects || !m_floatingObjects->set().contains(floatingObject)) {
+            if (!m_floatingObjects || !m_floatingObjects->set().contains(&floatingObject)) {
                 // We create the floating object list lazily.
                 if (!m_floatingObjects)
                     createFloatingObjects();
 
                 // Applying the child's margin makes no sense in the case where the child was passed in.
                 // since this margin was added already through the modification of the |logicalLeftOffset| variable
                 // above. |logicalLeftOffset| will equal the margin in this case, so it's already been taken
                 // into account. Only apply this code if prev is the parent, since otherwise the left margin
                 // will get applied twice.
                 LayoutSize offset = isHorizontalWritingMode()
                     ? LayoutSize(logicalLeftOffset - (prev != parent() ? prev->marginLeft() : LayoutUnit()), logicalTopOffset)
                     : LayoutSize(logicalTopOffset, logicalLeftOffset - (prev != parent() ? prev->marginTop() : LayoutUnit()));
 
-                m_floatingObjects->add(floatingObject->copyToNewContainer(offset));
+                m_floatingObjects->add(floatingObject.copyToNewContainer(offset));
             }
         }
     }
 }
 
 void LayoutBlockFlow::addOverhangingFloats(LayoutBlockFlow* child, bool makeChildPaintOtherFloats)
 {
     // Prevent floats from being added to the canvas by the root element, e.g., <html>.
     if (!child->containsFloats() || child->createsNewFormattingContext())
         return;
 
     LayoutUnit childLogicalTop = child->logicalTop();
     LayoutUnit childLogicalLeft = child->logicalLeft();
 
     // Floats that will remain the child's responsibility to paint should factor into its
     // overflow.
     FloatingObjectSetIterator childEnd = child->m_floatingObjects->set().end();
     for (FloatingObjectSetIterator childIt = child->m_floatingObjects->set().begin(); childIt != childEnd; ++childIt) {
-        FloatingObject* floatingObject = childIt->get();
+        FloatingObject& floatingObject = *childIt->get();
         LayoutUnit logicalBottomForFloat = std::min(this->logicalBottomForFloat(floatingObject), LayoutUnit::max() - childLogicalTop);
         LayoutUnit logicalBottom = childLogicalTop + logicalBottomForFloat;
 
         if (logicalBottom > logicalHeight()) {
             // If the object is not in the list, we add it now.
-            if (!containsFloat(floatingObject->layoutObject())) {
+            if (!containsFloat(floatingObject.layoutObject())) {
                 LayoutSize offset = isHorizontalWritingMode() ? LayoutSize(-childLogicalLeft, -childLogicalTop) : LayoutSize(-childLogicalTop, -childLogicalLeft);
                 bool shouldPaint = false;
 
                 // The nearest enclosing layer always paints the float (so that zindex and stacking
                 // behaves properly). We always want to propagate the desire to paint the float as
                 // far out as we can, to the outermost block that overlaps the float, stopping only
                 // if we hit a self-painting layer boundary.
-                if (floatingObject->layoutObject()->enclosingFloatPaintingLayer() == enclosingFloatPaintingLayer()) {
-                    floatingObject->setShouldPaint(false);
+                if (floatingObject.layoutObject()->enclosingFloatPaintingLayer() == enclosingFloatPaintingLayer()) {
+                    floatingObject.setShouldPaint(false);
                     shouldPaint = true;
                 }
                 // We create the floating object list lazily.
                 if (!m_floatingObjects)
                     createFloatingObjects();
 
-                m_floatingObjects->add(floatingObject->copyToNewContainer(offset, shouldPaint, true));
+                m_floatingObjects->add(floatingObject.copyToNewContainer(offset, shouldPaint, true));
             }
         } else {
-            if (makeChildPaintOtherFloats && !floatingObject->shouldPaint() && !floatingObject->layoutObject()->hasSelfPaintingLayer()
-                && floatingObject->layoutObject()->isDescendantOf(child) && floatingObject->layoutObject()->enclosingFloatPaintingLayer() == child->enclosingFloatPaintingLayer()) {
+            if (makeChildPaintOtherFloats && !floatingObject.shouldPaint() && !floatingObject.layoutObject()->hasSelfPaintingLayer()
+                && floatingObject.layoutObject()->isDescendantOf(child) && floatingObject.layoutObject()->enclosingFloatPaintingLayer() == child->enclosingFloatPaintingLayer()) {
                 // The float is not overhanging from this block, so if it is a descendant of the child, the child should
                 // paint it (the other case is that it is intruding into the child), unless it has its own layer or enclosing
                 // layer.
                 // If makeChildPaintOtherFloats is false, it means that the child must already know about all the floats
                 // it should paint.
-                floatingObject->setShouldPaint(true);
+                floatingObject.setShouldPaint(true);
             }
 
             // Since the float doesn't overhang, it didn't get put into our list. We need to go ahead and add its overflow in to the
             // child now.
-            if (floatingObject->isDescendant())
-                child->addOverflowFromChild(floatingObject->layoutObject(), LayoutSize(xPositionForFloatIncludingMargin(floatingObject), yPositionForFloatIncludingMargin(floatingObject)));
+            if (floatingObject.isDescendant())
+                child->addOverflowFromChild(floatingObject.layoutObject(), LayoutSize(xPositionForFloatIncludingMargin(floatingObject), yPositionForFloatIncludingMargin(floatingObject)));
         }
     }
 }
 
 LayoutUnit LayoutBlockFlow::lowestFloatLogicalBottom(FloatingObject::Type floatType) const
 {
     if (!m_floatingObjects)
         return LayoutUnit();
 
     return m_floatingObjects->lowestFloatLogicalBottom(floatType);
 }
 
 LayoutUnit LayoutBlockFlow::nextFloatLogicalBottomBelow(LayoutUnit logicalHeight, ShapeOutsideFloatOffsetMode offsetMode) const
 {
     if (!m_floatingObjects)
         return logicalHeight;
 
     LayoutUnit logicalBottom;
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator end = floatingObjectSet.end();
     for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
-        FloatingObject* floatingObject = it->get();
+        const FloatingObject& floatingObject = *it->get();
         LayoutUnit floatLogicalBottom = logicalBottomForFloat(floatingObject);
-        ShapeOutsideInfo* shapeOutside = floatingObject->layoutObject()->shapeOutsideInfo();
+        ShapeOutsideInfo* shapeOutside = floatingObject.layoutObject()->shapeOutsideInfo();
         if (shapeOutside && (offsetMode == ShapeOutsideFloatShapeOffset)) {
-            LayoutUnit shapeLogicalBottom = logicalTopForFloat(floatingObject) + marginBeforeForChild(*(floatingObject->layoutObject())) + shapeOutside->shapeLogicalBottom();
+            LayoutUnit shapeLogicalBottom = logicalTopForFloat(floatingObject) + marginBeforeForChild(*(floatingObject.layoutObject())) + shapeOutside->shapeLogicalBottom();
             // Use the shapeLogicalBottom unless it extends outside of the margin box, in which case it is clipped.
             if (shapeLogicalBottom < floatLogicalBottom)
                 floatLogicalBottom = shapeLogicalBottom;
         }
         if (floatLogicalBottom > logicalHeight)
             logicalBottom = logicalBottom ? std::min(floatLogicalBottom, logicalBottom) : floatLogicalBottom;
     }
 
     return logicalBottom;
 }
 
 bool LayoutBlockFlow::hitTestFloats(HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset)
 {
     if (!m_floatingObjects)
         return false;
 
     LayoutPoint adjustedLocation = accumulatedOffset;
     if (isLayoutView()) {
         DoublePoint position = toLayoutView(this)->frameView()->scrollPositionDouble();
         adjustedLocation.move(position.x(), position.y());
     }
 
     const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
     FloatingObjectSetIterator begin = floatingObjectSet.begin();
     for (FloatingObjectSetIterator it = floatingObjectSet.end(); it != begin;) {
         --it;
-        FloatingObject* floatingObject = it->get();
-        if (floatingObject->shouldPaint() && !floatingObject->layoutObject()->hasSelfPaintingLayer()) {
-            LayoutUnit xOffset = xPositionForFloatIncludingMargin(floatingObject) - floatingObject->layoutObject()->location().x();
-            LayoutUnit yOffset = yPositionForFloatIncludingMargin(floatingObject) - floatingObject->layoutObject()->location().y();
+        const FloatingObject& floatingObject = *it->get();
+        if (floatingObject.shouldPaint() && !floatingObject.layoutObject()->hasSelfPaintingLayer()) {
+            LayoutUnit xOffset = xPositionForFloatIncludingMargin(floatingObject) - floatingObject.layoutObject()->location().x();
+            LayoutUnit yOffset = yPositionForFloatIncludingMargin(floatingObject) - floatingObject.layoutObject()->location().y();
             LayoutPoint childPoint = flipFloatForWritingModeForChild(floatingObject, adjustedLocation + LayoutSize(xOffset, yOffset));
-            if (floatingObject->layoutObject()->hitTest(result, locationInContainer, childPoint)) {
+            if (floatingObject.layoutObject()->hitTest(result, locationInContainer, childPoint)) {
                 updateHitTestResult(result, locationInContainer.point() - toLayoutSize(childPoint));
                 return true;
             }
         }
     }
 
     return false;
 }
 
 LayoutUnit LayoutBlockFlow::logicalLeftFloatOffsetForLine(LayoutUnit logicalTop, LayoutUnit fixedOffset, LayoutUnit logicalHeight) const
@@ skipping 471 matching lines @@
     FrameView* frameView = document().view();
     LayoutUnit top = (style()->position() == FixedPosition) ? 0 : frameView->scrollOffset().height();
     int visibleHeight = frameView->visibleContentRect(IncludeScrollbars).height();
     if (size().height() < visibleHeight)
         top += (visibleHeight - size().height()) / 2;
     setY(top);
     dialog->setCentered(top);
 }
 
 } // namespace blink