Introduce toSVGInlineFlowBox() and use it

Source/core/rendering/svg/SVGRootInlineBox.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.
  * Copyright (C) 2011 Torch Mobile (Beijing) CO. Ltd. 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
@@ skipping 32 matching lines @@
 
     bool isPrinting = renderer()->document()->printing();
     bool hasSelection = !isPrinting && selectionState() != RenderObject::SelectionNone;
 
     PaintInfo childPaintInfo(paintInfo);
     if (hasSelection) {
         for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
             if (child->isSVGInlineTextBox())
                 toSVGInlineTextBox(child)->paintSelectionBackground(childPaintInfo);
             else if (child->isSVGInlineFlowBox())
-                static_cast<SVGInlineFlowBox*>(child)->paintSelectionBackground(childPaintInfo);
+                toSVGInlineFlowBox(child)->paintSelectionBackground(childPaintInfo);
         }
     }
 
     SVGRenderingContext renderingContext(boxRenderer, paintInfo, SVGRenderingContext::SaveGraphicsContext);
     if (renderingContext.isRenderingPrepared()) {
         for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
             if (child->isSVGInlineTextBox())
                 SVGInlineFlowBox::computeTextMatchMarkerRectForRenderer(toRenderSVGInlineText(toSVGInlineTextBox(child)->textRenderer()));
 
             child->paint(paintInfo, LayoutPoint(), 0, 0);
@@ skipping 41 matching lines @@
         if (child->isSVGInlineTextBox()) {
             ASSERT(child->renderer());
             ASSERT(child->renderer()->isSVGInlineText());
             characterLayout.layoutInlineTextBox(toSVGInlineTextBox(child));
         } else {
             // Skip generated content.
             Node* node = child->renderer()->node();
             if (!node)
                 continue;
 
-            ASSERT_WITH_SECURITY_IMPLICATION(child->isInlineFlowBox());
-
-            SVGInlineFlowBox* flowBox = static_cast<SVGInlineFlowBox*>(child);
+            SVGInlineFlowBox* flowBox = toSVGInlineFlowBox(child);
             bool isTextPath = node->hasTagName(SVGNames::textPathTag);
             if (isTextPath) {
                 // Build text chunks for all <textPath> children, using the line layout algorithm.
                 // This is needeed as text-anchor is just an additional startOffset for text paths.
                 SVGTextLayoutEngine lineLayout(characterLayout.layoutAttributes());
                 layoutCharactersInTextBoxes(flowBox, lineLayout);
 
                 characterLayout.beginTextPathLayout(child->renderer(), lineLayout);
             }
 
@@ skipping 17 matching lines @@
             boxRect = textBox->calculateBoundaries();
             textBox->setX(boxRect.x());
             textBox->setY(boxRect.y());
             textBox->setLogicalWidth(boxRect.width());
             textBox->setLogicalHeight(boxRect.height());
         } else {
             // Skip generated content.
             if (!child->renderer()->node())
                 continue;
 
-            ASSERT_WITH_SECURITY_IMPLICATION(child->isInlineFlowBox());
-
-            SVGInlineFlowBox* flowBox = static_cast<SVGInlineFlowBox*>(child);
+            SVGInlineFlowBox* flowBox = toSVGInlineFlowBox(child);
             layoutChildBoxes(flowBox);
 
             boxRect = flowBox->calculateBoundaries();
             flowBox->setX(boxRect.x());
             flowBox->setY(boxRect.y());
             flowBox->setLogicalWidth(boxRect.width());
             flowBox->setLogicalHeight(boxRect.height());
         }
         if (childRect)
             childRect->unite(boxRect);
@@ skipping 135 matching lines @@
     }
 }
 
 void SVGRootInlineBox::reorderValueLists(Vector<SVGTextLayoutAttributes*>& attributes)
 {
     Vector<InlineBox*> leafBoxesInLogicalOrder;
     collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder, reverseInlineBoxRangeAndValueListsIfNeeded, &attributes);
 }
 
 } // namespace WebCore