Inroduce toSVGInlineTextBox, 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 30 matching lines @@
     RenderObject* boxRenderer = renderer();
     ASSERT(boxRenderer);
 
     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())
-                static_cast<SVGInlineTextBox*>(child)->paintSelectionBackground(childPaintInfo);
+                toSVGInlineTextBox(child)->paintSelectionBackground(childPaintInfo);
             else if (child->isSVGInlineFlowBox())
                 static_cast<SVGInlineFlowBox*>(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(static_cast<SVGInlineTextBox*>(child)->textRenderer()));
+                SVGInlineFlowBox::computeTextMatchMarkerRectForRenderer(toRenderSVGInlineText(toSVGInlineTextBox(child)->textRenderer()));
 
             child->paint(paintInfo, LayoutPoint(), 0, 0);
         }
     }
 }
 
 void SVGRootInlineBox::markDirty(bool dirty)
 {
     if (dirty)
         for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
@@ skipping 26 matching lines @@
     layoutChildBoxes(this, &childRect);
     layoutRootBox(childRect);
 }
 
 void SVGRootInlineBox::layoutCharactersInTextBoxes(InlineFlowBox* start, SVGTextLayoutEngine& characterLayout)
 {
     for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
         if (child->isSVGInlineTextBox()) {
             ASSERT(child->renderer());
             ASSERT(child->renderer()->isSVGInlineText());
-
-            SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(child);
-            characterLayout.layoutInlineTextBox(textBox);
+            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);
             bool isTextPath = node->hasTagName(SVGNames::textPathTag);
@@ skipping 15 matching lines @@
 }
 
 void SVGRootInlineBox::layoutChildBoxes(InlineFlowBox* start, FloatRect* childRect)
 {
     for (InlineBox* child = start->firstChild(); child; child = child->nextOnLine()) {
         FloatRect boxRect;
         if (child->isSVGInlineTextBox()) {
             ASSERT(child->renderer());
             ASSERT(child->renderer()->isSVGInlineText());
 
-            SVGInlineTextBox* textBox = static_cast<SVGInlineTextBox*>(child);
+            SVGInlineTextBox* textBox = toSVGInlineTextBox(child);
             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;
 
@@ skipping 119 matching lines @@
             return;
 
         if (!(*last)->isSVGInlineTextBox() || !(*first)->isSVGInlineTextBox()) {
             InlineBox* temp = *first;
             *first = *last;
             *last = temp;
             ++first;
             continue;
         }
 
-        SVGInlineTextBox* firstTextBox = static_cast<SVGInlineTextBox*>(*first);
-        SVGInlineTextBox* lastTextBox = static_cast<SVGInlineTextBox*>(*last);
+        SVGInlineTextBox* firstTextBox = toSVGInlineTextBox(*first);
+        SVGInlineTextBox* lastTextBox = toSVGInlineTextBox(*last);
 
         // Reordering is only necessary for BiDi text that is _absolutely_ positioned.
         if (firstTextBox->len() == 1 && firstTextBox->len() == lastTextBox->len()) {
             RenderSVGInlineText* firstContext = toRenderSVGInlineText(firstTextBox->textRenderer());
             RenderSVGInlineText* lastContext = toRenderSVGInlineText(lastTextBox->textRenderer());
 
             SVGTextLayoutAttributes* firstAttributes = 0;
             SVGTextLayoutAttributes* lastAttributes = 0;
             findFirstAndLastAttributesInVector(attributes, firstContext, lastContext, firstAttributes, lastAttributes);
             swapItemsInLayoutAttributes(firstAttributes, lastAttributes, firstTextBox->start(), lastTextBox->start());
         }
 
         InlineBox* temp = *first;
         *first = *last;
         *last = temp;
 
         ++first;
     }
 }
 
 void SVGRootInlineBox::reorderValueLists(Vector<SVGTextLayoutAttributes*>& attributes)
 {
     Vector<InlineBox*> leafBoxesInLogicalOrder;
     collectLeafBoxesInLogicalOrder(leafBoxesInLogicalOrder, reverseInlineBoxRangeAndValueListsIfNeeded, &attributes);
 }
 
 } // namespace WebCore