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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"
#include "StylePrimitiveNumericTypes.h"
#include <wtf/TZoneMalloc.h>
namespace WebCore {
namespace Style {
struct BoxShadow;
struct TextShadow;
}
enum class ShadowStyle : bool { Normal, Inset };
// This class holds information about shadows for the text-shadow and box-shadow properties.
class ShadowData {
WTF_MAKE_TZONE_ALLOCATED(ShadowData);
public:
ShadowData(Style::BoxShadow&&);
ShadowData(Style::TextShadow&&);
~ShadowData();
ShadowData(const ShadowData&);
static std::optional<ShadowData> clone(const ShadowData*);
ShadowData& operator=(ShadowData&&) = default;
bool operator==(const ShadowData&) const;
Style::BoxShadow asBoxShadow() const;
Style::TextShadow asTextShadow() const;
const Style::Length<>& x() const { return m_location.x(); }
const Style::Length<>& y() const { return m_location.y(); }
const SpaceSeparatedPoint<Style::Length<>>& location() const { return m_location; }
const Style::Length<CSS::Nonnegative>& radius() const { return m_blur; }
const Style::Length<>& spread() const { return m_spread; }
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_blur.value * radiusExtentMultiplier));
}
ShadowStyle style() const { return m_style; }
void setColor(const Style::Color& color) { m_color = color; }
const Style::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>&& next) { m_next = WTFMove(next); }
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();
Style::Color m_color;
SpaceSeparatedPoint<Style::Length<>> m_location;
Style::Length<CSS::Nonnegative> m_blur;
Style::Length<> m_spread;
ShadowStyle m_style;
bool m_isWebkitBoxShadow;
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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