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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 "FloatRect.h"
#include "LayoutRect.h"
#include "Length.h"
#include "LengthBox.h"
#include "LengthPoint.h"
#include "StyleColor.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 LengthPoint& location, Length radius, Length spread, ShadowStyle style, bool isWebkitBoxShadow, const StyleColor& color)
: m_location(location.x(), location.y())
, m_spread(spread)
, m_radius(radius)
, m_color(color)
, m_style(style)
, m_isWebkitBoxShadow(isWebkitBoxShadow)
{
}
~ShadowData();
ShadowData(const ShadowData&);
static std::optional<ShadowData> clone(const ShadowData*);
ShadowData& operator=(ShadowData&&) = default;
bool operator==(const ShadowData& o) const;
const Length& x() const { return m_location.x(); }
const Length& y() const { return m_location.y(); }
const LengthPoint& location() const { return m_location; }
const Length& 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.value() * radiusExtentMultiplier));
}
const Length& spread() const { return m_spread; }
ShadowStyle style() const { return m_style; }
void setColor(const StyleColor& color) { m_color = color; }
const StyleColor& 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&) const;
void adjustRectForShadow(FloatRect&) const;
LayoutBoxExtent shadowOutsetExtent() const;
LayoutBoxExtent shadowInsetExtent() const;
static LayoutBoxExtent shadowOutsetExtent(const ShadowData*);
static LayoutBoxExtent shadowInsetExtent(const ShadowData*);
private:
void deleteNextLinkedListWithoutRecursion();
LengthPoint m_location;
Length m_spread;
Length m_radius; // This is the "blur radius", or twice the standard deviation of the Gaussian blur.
StyleColor m_color;
ShadowStyle m_style { ShadowStyle::Normal };
bool m_isWebkitBoxShadow { false };
std::unique_ptr<ShadowData> m_next;
};
inline ShadowData::~ShadowData()
{
if (m_next)
deleteNextLinkedListWithoutRecursion();
}
inline LayoutBoxExtent ShadowData::shadowOutsetExtent(const ShadowData* shadow)
{
if (!shadow)
return { };
return shadow->shadowOutsetExtent();
}
inline LayoutBoxExtent ShadowData::shadowInsetExtent(const ShadowData* shadow)
{
if (!shadow)
return { };
return shadow->shadowInsetExtent();
}
WTF::TextStream& operator<<(WTF::TextStream&, const ShadowData&);
} // namespace WebCore
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