Make RenderObject::style() return a const object

Source/core/svg/SVGLengthContext.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 198 matching lines @@
     case LengthModeHeight:
         return value.scaleByPercentage(viewportSize.height());
     case LengthModeOther:
         return value.scaleByPercentage(sqrtf(viewportSize.diagonalLengthSquared() / 2));
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
-static inline RenderStyle* renderStyleForLengthResolving(const SVGElement* context)
+static inline const RenderStyle* renderStyleForLengthResolving(const SVGElement* context)
 {
     if (!context)
         return 0;
 
     const ContainerNode* currentContext = context;
     do {
         if (currentContext->renderer())
             return currentContext->renderer()->style();
         currentContext = currentContext->parentNode();
     } while (currentContext);
 
     // There must be at least a RenderSVGRoot renderer, carrying a style.
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 float SVGLengthContext::convertValueFromUserUnitsToEMS(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
     }
 
     float fontSize = style->specifiedFontSize();
     if (!fontSize) {
         exceptionState.throwDOMException(NotSupportedError, "No font-size could be determined.");
         return 0;
     }
 
     return value / fontSize;
 }
 
 float SVGLengthContext::convertValueFromEMSToUserUnits(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
     }
 
     return value * style->specifiedFontSize();
 }
 
 float SVGLengthContext::convertValueFromUserUnitsToEXS(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
     }
 
     // Use of ceil allows a pixel match to the W3Cs expected output of coords-units-03-b.svg
     // if this causes problems in real world cases maybe it would be best to remove this
     float xHeight = ceilf(style->fontMetrics().xHeight());
     if (!xHeight) {
         exceptionState.throwDOMException(NotSupportedError, "No x-height could be determined.");
         return 0;
     }
 
     return value / xHeight;
 }
 
 float SVGLengthContext::convertValueFromEXSToUserUnits(float value, ExceptionState& exceptionState) const
 {
-    RenderStyle* style = renderStyleForLengthResolving(m_context);
+    const RenderStyle* style = renderStyleForLengthResolving(m_context);
     if (!style) {
         exceptionState.throwDOMException(NotSupportedError, "No context could be found.");
         return 0;
     }
 
     // Use of ceil allows a pixel match to the W3Cs expected output of coords-units-03-b.svg
     // if this causes problems in real world cases maybe it would be best to remove this
     return value * ceilf(style->fontMetrics().xHeight());
 }
 
@@ skipping 15 matching lines @@
 
     const SVGSVGElement& svg = toSVGSVGElement(*viewportElement);
     viewportSize = svg.currentViewBoxRect().size();
     if (viewportSize.isEmpty())
         viewportSize = svg.currentViewportSize();
 
     return true;
 }
 
 }