Scaling and offset fix for FELighting (software and skia paths)

Source/platform/graphics/filters/DistantLightSource.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Zoltan Herczeg <zherczeg@webkit.org>
  * Copyright (C) 2011 University of Szeged
  * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/graphics/filters/DistantLightSource.h"
 
 #include "platform/text/TextStream.h"
 
 namespace WebCore {
 
-void DistantLightSource::initPaintingData(PaintingData& paintingData)
+void DistantLightSource::initPaintingData(PaintingData& paintingData) const
 {
     float azimuth = deg2rad(m_azimuth);
     float elevation = deg2rad(m_elevation);
     paintingData.lightVector.setX(cosf(azimuth) * cosf(elevation));
     paintingData.lightVector.setY(sinf(azimuth) * cosf(elevation));
     paintingData.lightVector.setZ(sinf(elevation));
     paintingData.lightVectorLength = 1;
 }
 
-void DistantLightSource::updatePaintingData(PaintingData&, int, int, float)
+void DistantLightSource::updatePaintingData(PaintingData&, int, int, float) const
 {
 }
 
 bool DistantLightSource::setAzimuth(float azimuth)
 {
     if (m_azimuth == azimuth)
         return false;
     m_azimuth = azimuth;
     return true;
 }
 
 bool DistantLightSource::setElevation(float elevation)
 {
     if (m_elevation == elevation)
         return false;
     m_elevation = elevation;
     return true;
 }
 
 TextStream& DistantLightSource::externalRepresentation(TextStream& ts) const
 {
     ts << "[type=DISTANT-LIGHT] ";
     ts << "[azimuth=\"" << azimuth() << "\"]";
     ts << "[elevation=\"" << elevation() << "\"]";
     return ts;
 }
 
 } // namespace WebCore