Optimize for horizontal writing mode

Source/core/rendering/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 444 matching lines @@
         LayoutUnit newRight = block().logicalRightOffsetForLine(selectionBottom, false);
         if (nextLeft > newLeft || nextRight < newRight)
             return selectionBottom;
     }
 
     return nextTop;
 }
 
 int RootInlineBox::blockDirectionPointInLine() const
 {
-    return !block().style()->isFlippedBlocksWritingMode() ? std::max(lineTop(), selectionTop()) : std::min(lineBottom(), selectionBottom());
+    return !block().style()->slowIsFlippedBlocksWritingMode() ? std::max(lineTop(), selectionTop()) : std::min(lineBottom(), selectionBottom());
 }
 
 RenderBlockFlow& RootInlineBox::block() const
 {
     return toRenderBlockFlow(renderer());
 }
 
 static bool isEditableLeaf(InlineBox* leaf)
 {
     return leaf && leaf->renderer().node() && leaf->renderer().node()->hasEditableStyle();
@@ skipping 382 matching lines @@
 }
 
 #ifndef NDEBUG
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 #endif
 
 } // namespace blink