Inroduce toSVGInlineTextBox, and use it.

Source/core/rendering/svg/SVGInlineFlowBox.cpp

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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.
@@ skipping 23 matching lines @@
 namespace WebCore {
 
 void SVGInlineFlowBox::paintSelectionBackground(PaintInfo& paintInfo)
 {
     ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
     ASSERT(!paintInfo.context->paintingDisabled());
 
     PaintInfo childPaintInfo(paintInfo);
     for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
         if (child->isSVGInlineTextBox())
-            static_cast<SVGInlineTextBox*>(child)->paintSelectionBackground(childPaintInfo);
+            toSVGInlineTextBox(child)->paintSelectionBackground(childPaintInfo);
         else if (child->isSVGInlineFlowBox())
             static_cast<SVGInlineFlowBox*>(child)->paintSelectionBackground(childPaintInfo);
     }
 }
 
 void SVGInlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint&, LayoutUnit, LayoutUnit)
 {
     ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
     ASSERT(!paintInfo.context->paintingDisabled());
 
     RenderObject* boxRenderer = renderer();
     ASSERT(boxRenderer);
 
     SVGRenderingContext renderingContext(boxRenderer, paintInfo, SVGRenderingContext::SaveGraphicsContext);
     if (renderingContext.isRenderingPrepared()) {
         for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
             if (child->isSVGInlineTextBox())
-                computeTextMatchMarkerRectForRenderer(toRenderSVGInlineText(static_cast<SVGInlineTextBox*>(child)->textRenderer()));
+                computeTextMatchMarkerRectForRenderer(toRenderSVGInlineText(toSVGInlineTextBox(child)->textRenderer()));
 
             child->paint(paintInfo, LayoutPoint(), 0, 0);
         }
     }
 }
 
 FloatRect SVGInlineFlowBox::calculateBoundaries() const
 {
     FloatRect childRect;
     for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
@@ skipping 25 matching lines @@
 
         // SVG is only interessted in the TextMatch marker, for now.
         if (marker->type() != DocumentMarker::TextMatch)
             continue;
 
         FloatRect markerRect;
         for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) {
             if (!box->isSVGInlineTextBox())
                 continue;
 
-            SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(box);
+            SVGInlineTextBox* textBox = toSVGInlineTextBox(box);
 
             int markerStartPosition = max<int>(marker->startOffset() - textBox->start(), 0);
             int markerEndPosition = min<int>(marker->endOffset() - textBox->start(), textBox->len());
 
             if (markerStartPosition >= markerEndPosition)
                 continue;
 
             int fragmentStartPosition = 0;
             int fragmentEndPosition = 0;
 
@@ skipping 14 matching lines @@
 
                 markerRect.unite(fragmentRect);
             }
         }
 
         toRenderedDocumentMarker(marker)->setRenderedRect(textRenderer->localToAbsoluteQuad(markerRect).enclosingBoundingBox());
     }
 }
 
 } // namespace WebCore