text: /*
   * 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
   * License as published by the Free Software Foundation; either
   * version 2 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public License
   * along with this library; see the file COPYING.LIB.  If not, write to
   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   *
   */
  
  #pragma once
  
  #include "Color.h"
  #include "FloatRect.h"
  #include "LayoutRect.h"
  
  namespace WebCore {
  
  enum class ShadowStyle : uint8_t { Normal, Inset };
  
  // This class holds information about shadows for the text-shadow and box-shadow properties.
  
  class ShadowData {
      WTF_MAKE_FAST_ALLOCATED;
  public:
      ShadowData() = default;
  
      ShadowData(const LayoutPoint& location, int radius, LayoutUnit spread, ShadowStyle style, bool isWebkitBoxShadow, const Color& color)
          : m_location(location)
          , m_spread(spread)
          , m_radius(radius)
          , m_color(color)
          , m_style(style)
          , m_isWebkitBoxShadow(isWebkitBoxShadow)
      {
      }
  
      ShadowData(const ShadowData&);
      static Optional<ShadowData> clone(const ShadowData*);
  
      ShadowData& operator=(ShadowData&&) = default;
  
      bool operator==(const ShadowData& o) const;
      bool operator!=(const ShadowData& o) const
      {
          return !(*this == o);
      }
      
      LayoutUnit x() const { return m_location.x(); }
      LayoutUnit y() const { return m_location.y(); }
      LayoutPoint location() const { return m_location; }
      int radius() const { return m_radius; }
      LayoutUnit paintingExtent() const
      {
          // Blurring uses a Gaussian function whose std. deviation is m_radius/2, and which in theory
          // extends to infinity. In 8-bit contexts, however, rounding causes the effect to become
          // undetectable at around 1.4x the radius.
          const float radiusExtentMultiplier = 1.4;
          return LayoutUnit(ceilf(m_radius * radiusExtentMultiplier));
      }
      LayoutUnit spread() const { return m_spread; }
      ShadowStyle style() const { return m_style; }
      const Color& color() const { return m_color; }
      bool isWebkitBoxShadow() const { return m_isWebkitBoxShadow; }
  
      const ShadowData* next() const { return m_next.get(); }
      void setNext(std::unique_ptr<ShadowData> shadow) { m_next = WTFMove(shadow); }
  
      void adjustRectForShadow(LayoutRect&, int additionalOutlineSize = 0) const;
      void adjustRectForShadow(FloatRect&, int additionalOutlineSize = 0) const;
  
  private:
      LayoutPoint m_location;
      LayoutUnit m_spread;
      int m_radius { 0 }; // This is the "blur radius", or twice the standard deviation of the Gaussian blur.
      Color m_color;
      ShadowStyle m_style { ShadowStyle::Normal };
      bool m_isWebkitBoxShadow { false };
      std::unique_ptr<ShadowData> m_next;
  };
  
  WTF::TextStream& operator<<(WTF::TextStream&, const ShadowData&);
  
  } // namespace WebCore
  