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

Source/platform/graphics/filters/SpotLightSource.h

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * 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>
  *
  * 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 17 matching lines @@
 namespace WebCore {
 
 class PLATFORM_EXPORT SpotLightSource : public LightSource {
 public:
     static PassRefPtr<SpotLightSource> create(const FloatPoint3D& position,
         const FloatPoint3D& direction, float specularExponent, float limitingConeAngle)
     {
         return adoptRef(new SpotLightSource(position, direction, specularExponent, limitingConeAngle));
     }
 
+    virtual PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const OVERRIDE
+    {
+        FloatPoint3D position(m_position.x() * scale.x() - offset.width(), m_position.y() * scale.y() - offset.height(), m_position.z() * scale.z());
+        FloatPoint3D direction(m_direction.x() * scale.x() - offset.width(), m_direction.y() * scale.y() - offset.height(), m_direction.z() * scale.z());
+        return adoptRef(new SpotLightSource(position, direction, m_specularExponent, m_limitingConeAngle));
+    }
+
     const FloatPoint3D& position() const { return m_position; }
     const FloatPoint3D& direction() const { return m_direction; }
     float specularExponent() const { return m_specularExponent; }
     float limitingConeAngle() const { return m_limitingConeAngle; }
 
     virtual bool setX(float) OVERRIDE;
     virtual bool setY(float) OVERRIDE;
     virtual bool setZ(float) OVERRIDE;
     virtual bool setPointsAtX(float) OVERRIDE;
     virtual bool setPointsAtY(float) OVERRIDE;
     virtual bool setPointsAtZ(float) OVERRIDE;
 
     virtual bool setSpecularExponent(float) OVERRIDE;
     virtual bool setLimitingConeAngle(float) OVERRIDE;
 
-    virtual void initPaintingData(PaintingData&) OVERRIDE;
-    virtual void updatePaintingData(PaintingData&, int x, int y, float z) OVERRIDE;
+    virtual void initPaintingData(PaintingData&) const OVERRIDE;
+    virtual void updatePaintingData(PaintingData&, int x, int y, float z) const OVERRIDE;
 
     virtual TextStream& externalRepresentation(TextStream&) const OVERRIDE;
 
 private:
     SpotLightSource(const FloatPoint3D& position, const FloatPoint3D& direction,
         float specularExponent, float limitingConeAngle)
         : LightSource(LS_SPOT)
         , m_position(position)
         , m_direction(direction)
         , m_specularExponent(specularExponent)
         , m_limitingConeAngle(limitingConeAngle)
     {
     }
 
     FloatPoint3D m_position;
     FloatPoint3D m_direction;
 
     float m_specularExponent;
     float m_limitingConeAngle;
 };
 
 } // namespace WebCore
 
 #endif // SpotLightSource_h