Constify the rendering/ selection code

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 274 matching lines @@
             return result;
 
         // We have to compute the expansion for annotations over the previous line to see how much we should move.
         LayoutUnit lowestAllowedPosition = std::max(prevRootBox()->lineBottom(), lineTop()) - result;
         result = prevRootBox()->computeOverAnnotationAdjustment(lowestAllowedPosition);
     }
 
     return result;
 }
 
-GapRects RootInlineBox::lineSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
-                                         LayoutUnit selTop, LayoutUnit selHeight, const PaintInfo* paintInfo)
+GapRects RootInlineBox::lineSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
+                                         LayoutUnit selTop, LayoutUnit selHeight, const PaintInfo* paintInfo) const
 {
     RenderObject::SelectionState lineState = selectionState();
 
     bool leftGap, rightGap;
     block().getSelectionGapInfo(lineState, leftGap, rightGap);
 
     GapRects result;
 
     InlineBox* firstBox = firstSelectedBox();
     InlineBox* lastBox = lastSelectedBox();
@@ skipping 32 matching lines @@
             }
             if (box == lastBox)
                 break;
             isPreviousBoxSelected = box->selectionState() != RenderObject::SelectionNone;
         }
     }
 
     return result;
 }
 
-RenderObject::SelectionState RootInlineBox::selectionState()
+RenderObject::SelectionState RootInlineBox::selectionState() const
 {
     // Walk over all of the selected boxes.
     RenderObject::SelectionState state = RenderObject::SelectionNone;
     for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
         RenderObject::SelectionState boxState = box->selectionState();
         if ((boxState == RenderObject::SelectionStart && state == RenderObject::SelectionEnd) ||
             (boxState == RenderObject::SelectionEnd && state == RenderObject::SelectionStart))
             state = RenderObject::SelectionBoth;
         else if (state == RenderObject::SelectionNone ||
                  ((boxState == RenderObject::SelectionStart || boxState == RenderObject::SelectionEnd) &&
                   (state == RenderObject::SelectionNone || state == RenderObject::SelectionInside)))
             state = boxState;
         else if (boxState == RenderObject::SelectionNone && state == RenderObject::SelectionStart) {
             // We are past the end of the selection.
             state = RenderObject::SelectionBoth;
         }
         if (state == RenderObject::SelectionBoth)
             break;
     }
 
     return state;
 }
 
-InlineBox* RootInlineBox::firstSelectedBox()
+InlineBox* RootInlineBox::firstSelectedBox() const
 {
     for (InlineBox* box = firstLeafChild(); box; box = box->nextLeafChild()) {
         if (box->selectionState() != RenderObject::SelectionNone)
             return box;
     }
 
     return 0;
 }
 
-InlineBox* RootInlineBox::lastSelectedBox()
+InlineBox* RootInlineBox::lastSelectedBox() const
 {
     for (InlineBox* box = lastLeafChild(); box; box = box->prevLeafChild()) {
         if (box->selectionState() != RenderObject::SelectionNone)
             return box;
     }
 
     return 0;
 }
 
 LayoutUnit RootInlineBox::selectionTop() const
@@ skipping 471 matching lines @@
 }
 
 #ifndef NDEBUG
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 #endif
 
 } // namespace blink