Minimize RenderObject* casting to RenderText*

Source/core/rendering/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 363 matching lines @@
     endPlacingBoxRangesInInlineDirection(startLogicalLeft, logicalLeft, minLogicalLeft, maxLogicalRight);
     return logicalLeft;
 }
 
 float InlineFlowBox::placeBoxRangeInInlineDirection(InlineBox* firstChild, InlineBox* lastChild,
     float& logicalLeft, float& minLogicalLeft, float& maxLogicalRight, bool& needsWordSpacing)
 {
     for (InlineBox* curr = firstChild; curr && curr != lastChild; curr = curr->nextOnLine()) {
         if (curr->renderer().isText()) {
             InlineTextBox* text = toInlineTextBox(curr);
-            RenderText& rt = toRenderText(text->renderer());
+            RenderText& rt = text->renderer();
             if (rt.textLength()) {
                 if (needsWordSpacing && isSpaceOrNewline(rt.characterAt(text->start())))
                     logicalLeft += rt.style(isFirstLineStyle())->font().fontDescription().wordSpacing();
                 needsWordSpacing = !isSpaceOrNewline(rt.characterAt(text->end()));
             }
             text->setLogicalLeft(logicalLeft);
             if (knownToHaveNoOverflow())
                 minLogicalLeft = std::min(logicalLeft, minLogicalLeft);
             logicalLeft += text->logicalWidth();
             if (knownToHaveNoOverflow())
@@ skipping 554 matching lines @@
     addBoxShadowVisualOverflow(logicalVisualOverflow);
     addBorderOutsetVisualOverflow(logicalVisualOverflow);
     addOutlineVisualOverflow(logicalVisualOverflow);
 
     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
         if (curr->renderer().isOutOfFlowPositioned())
             continue; // Positioned placeholders don't affect calculations.
 
         if (curr->renderer().isText()) {
             InlineTextBox* text = toInlineTextBox(curr);
-            RenderText& rt = toRenderText(text->renderer());
+            RenderText& rt = text->renderer();
             if (rt.isBR())
                 continue;
             LayoutRect textBoxOverflow(enclosingLayoutRect(text->logicalFrameRect()));
             addTextBoxVisualOverflow(text, textBoxDataMap, textBoxOverflow);
             logicalVisualOverflow.unite(textBoxOverflow);
         } else if (curr->renderer().isRenderInline()) {
             InlineFlowBox* flow = toInlineFlowBox(curr);
             flow->computeOverflow(lineTop, lineBottom, textBoxDataMap);
             if (!flow->boxModelObject()->hasSelfPaintingLayer())
                 logicalVisualOverflow.unite(flow->logicalVisualOverflowRect(lineTop, lineBottom));
@@ skipping 695 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink