Use ShadowData in DropShadowFilterOperation

third_party/WebKit/Source/core/style/ShadowData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 18 matching lines @@
 #include "core/css/StyleColor.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/FloatRectOutsets.h"
 #include "platform/graphics/skia/SkiaUtils.h"
 
 namespace blink {
 
 enum ShadowStyle { Normal, Inset };
 
 // This class holds information about shadows for the text-shadow and box-shadow
-// properties.
+// properties, as well as the drop-shadow(...) filter operation.
 class ShadowData {
   USING_FAST_MALLOC(ShadowData);
 
  public:
   ShadowData(const FloatPoint& location,
              float blur,
              float spread,
              ShadowStyle style,
              StyleColor color)
       : m_location(location),
         m_blur(blur),
         m_spread(spread),
         m_color(color),
         m_style(style) {}
 
   bool operator==(const ShadowData&) const;
   bool operator!=(const ShadowData& o) const { return !(*this == o); }
 
   ShadowData blend(const ShadowData& from,
                    double progress,
                    const Color& currentColor) const;
+  static ShadowData neutralValue();
 
   float x() const { return m_location.x(); }
   float y() const { return m_location.y(); }
   FloatPoint location() const { return m_location; }
   float blur() const { return m_blur; }
   float spread() const { return m_spread; }
   ShadowStyle style() const { return m_style; }
   StyleColor color() const { return m_color; }
 
+  void overrideColor(Color color) { m_color = StyleColor(color); }
+
   // Outsets needed to adjust a source rectangle to the one cast by this
   // shadow.
   FloatRectOutsets rectOutsets() const {
     // 3 * skBlurRadiusToSigma(blur()) is how Skia implements the radius of a
     // blur. See also https://crbug.com/624175.
     float blurAndSpread = ceil(3 * skBlurRadiusToSigma(blur())) + spread();
     return FloatRectOutsets(
         blurAndSpread - y() /* top */, blurAndSpread + x() /* right */,
         blurAndSpread + y() /* bottom */, blurAndSpread - x() /* left */);
   }
 
  private:
   FloatPoint m_location;
   float m_blur;
   float m_spread;
   StyleColor m_color;
   ShadowStyle m_style;
 };
 
 }  // namespace blink
 
 #endif  // ShadowData_h