102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/*
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* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
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* (C) 2000 Antti Koivisto (koivisto@kde.org)
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* (C) 2000 Dirk Mueller (mueller@kde.org)
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* Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#pragma once
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#include "Color.h"
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#include "FloatRect.h"
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#include "LayoutRect.h"
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namespace WebCore {
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enum class ShadowStyle : uint8_t { Normal, Inset };
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// This class holds information about shadows for the text-shadow and box-shadow properties.
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class ShadowData {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ShadowData() = default;
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ShadowData(const LayoutPoint& location, int radius, LayoutUnit spread, ShadowStyle style, bool isWebkitBoxShadow, const Color& color)
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: m_location(location)
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, m_spread(spread)
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, m_radius(radius)
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, m_color(color)
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, m_style(style)
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, m_isWebkitBoxShadow(isWebkitBoxShadow)
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{
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}
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ShadowData(const ShadowData&);
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static std::optional<ShadowData> clone(const ShadowData*);
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ShadowData& operator=(ShadowData&&) = default;
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bool operator==(const ShadowData& o) const;
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bool operator!=(const ShadowData& o) const
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{
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return !(*this == o);
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}
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LayoutUnit x() const { return m_location.x(); }
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LayoutUnit y() const { return m_location.y(); }
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LayoutPoint location() const { return m_location; }
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int radius() const { return m_radius; }
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LayoutUnit paintingExtent() const
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{
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// Blurring uses a Gaussian function whose std. deviation is m_radius/2, and which in theory
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// extends to infinity. In 8-bit contexts, however, rounding causes the effect to become
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// undetectable at around 1.4x the radius.
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const float radiusExtentMultiplier = 1.4;
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return LayoutUnit(ceilf(m_radius * radiusExtentMultiplier));
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}
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LayoutUnit spread() const { return m_spread; }
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ShadowStyle style() const { return m_style; }
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void setColor(const Color& color) { m_color = color; }
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const Color& color() const { return m_color; }
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bool isWebkitBoxShadow() const { return m_isWebkitBoxShadow; }
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const ShadowData* next() const { return m_next.get(); }
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void setNext(std::unique_ptr<ShadowData>&& shadow) { m_next = WTFMove(shadow); }
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void adjustRectForShadow(LayoutRect&, int additionalOutlineSize = 0) const;
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void adjustRectForShadow(FloatRect&, int additionalOutlineSize = 0) const;
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private:
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LayoutPoint m_location;
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LayoutUnit m_spread;
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int m_radius { 0 }; // This is the "blur radius", or twice the standard deviation of the Gaussian blur.
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Color m_color;
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ShadowStyle m_style { ShadowStyle::Normal };
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bool m_isWebkitBoxShadow { false };
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std::unique_ptr<ShadowData> m_next;
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};
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WTF::TextStream& operator<<(WTF::TextStream&, const ShadowData&);
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} // namespace WebCore
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