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/*
* 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 ShadowStyle { Normal, Inset };
// This class holds information about shadows for the text-shadow and box-shadow properties.
class ShadowData {
WTF_MAKE_FAST_ALLOCATED;
public:
ShadowData()
: m_radius(0)
, m_spread(0)
, m_style(Normal)
, m_isWebkitBoxShadow(false)
{
}
ShadowData(const IntPoint& location, int radius, int spread, ShadowStyle style, bool isWebkitBoxShadow, const Color& color)
: m_location(location)
, m_radius(radius)
, m_spread(spread)
, 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);
}
int x() const { return m_location.x(); }
int y() const { return m_location.y(); }
IntPoint location() const { return m_location; }
int radius() const { return m_radius; }
int 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 ceilf(m_radius * radiusExtentMultiplier);
}
int 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:
IntPoint m_location;
int m_radius; // This is the "blur radius", or twice the standard deviation of the Gaussian blur.
int m_spread;
Color m_color;
ShadowStyle m_style;
bool m_isWebkitBoxShadow;
std::unique_ptr<ShadowData> m_next;
};
} // namespace WebCore