Separate repaint and layout requirements of StyleDifference (Step 1)

Source/core/rendering/RenderBlockFlow.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 1800 matching lines @@
 
 void RenderBlockFlow::createFloatingObjects()
 {
     m_floatingObjects = adoptPtr(new FloatingObjects(this, isHorizontalWritingMode()));
 }
 
 void RenderBlockFlow::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
 {
     RenderStyle* oldStyle = style();
     s_canPropagateFloatIntoSibling = oldStyle ? !isFloatingOrOutOfFlowPositioned() && !avoidsFloats() : false;
-    if (oldStyle && parent() && diff == StyleDifferenceLayout && oldStyle->position() != newStyle.position()
+    if (oldStyle && parent() && diff.needsFullLayout() && oldStyle->position() != newStyle.position()
         && containsFloats() && !isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
             markAllDescendantsWithFloatsForLayout();
 
     RenderBlock::styleWillChange(diff, newStyle);
 }
 
 void RenderBlockFlow::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderBlock::styleDidChange(diff, oldStyle);
 
     // After our style changed, if we lose our ability to propagate floats into next sibling
     // blocks, then we need to find the top most parent containing that overhanging float and
     // then mark its descendants with floats for layout and clear all floats from its next
     // sibling blocks that exist in our floating objects list. See bug 56299 and 62875.
     bool canPropagateFloatIntoSibling = !isFloatingOrOutOfFlowPositioned() && !avoidsFloats();
-    if (diff == StyleDifferenceLayout && s_canPropagateFloatIntoSibling && !canPropagateFloatIntoSibling && hasOverhangingFloats()) {
+    if (diff.needsFullLayout() && s_canPropagateFloatIntoSibling && !canPropagateFloatIntoSibling && hasOverhangingFloats()) {
         RenderBlockFlow* parentBlockFlow = this;
         const FloatingObjectSet& floatingObjectSet = m_floatingObjects->set();
         FloatingObjectSetIterator end = floatingObjectSet.end();
 
         for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
             if (curr->isRenderBlockFlow()) {
                 RenderBlockFlow* currBlock = toRenderBlockFlow(curr);
 
                 if (currBlock->hasOverhangingFloats()) {
                     for (FloatingObjectSetIterator it = floatingObjectSet.begin(); it != end; ++it) {
                         RenderBox* renderer = (*it)->renderer();
                         if (currBlock->hasOverhangingFloat(renderer)) {
                             parentBlockFlow = currBlock;
                             break;
                         }
                     }
                 }
             }
         }
 
         parentBlockFlow->markAllDescendantsWithFloatsForLayout();
         parentBlockFlow->markSiblingsWithFloatsForLayout();
     }
 
-    if (diff == StyleDifferenceLayout || !oldStyle)
+    if (diff.needsFullLayout() || !oldStyle)
         createOrDestroyMultiColumnFlowThreadIfNeeded();
 }
 
 void RenderBlockFlow::updateStaticInlinePositionForChild(RenderBox* child, LayoutUnit logicalTop)
 {
     if (child->style()->isOriginalDisplayInlineType())
         setStaticInlinePositionForChild(child, logicalTop, startAlignedOffsetForLine(logicalTop, false));
     else
         setStaticInlinePositionForChild(child, logicalTop, startOffsetForContent());
 }
@@ skipping 920 matching lines @@
 RenderBlockFlow::RenderBlockFlowRareData& RenderBlockFlow::ensureRareData()
 {
     if (m_rareData)
         return *m_rareData;
 
     m_rareData = adoptPtr(new RenderBlockFlowRareData(this));
     return *m_rareData;
 }
 
 } // namespace WebCore