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/*
* Copyright (C) 2006-2017 Apple Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "CanvasGradient.h"
#include "CanvasPattern.h"
#include "Color.h"
#include "ColorSerialization.h"
#include <variant>
namespace WebCore {
class Document;
class GraphicsContext;
class CanvasBase;
class CanvasStyle {
public:
CanvasStyle();
CanvasStyle(Color);
CanvasStyle(const SRGBA<float>&);
CanvasStyle(CanvasGradient&);
CanvasStyle(CanvasPattern&);
static CanvasStyle createFromString(const String& color, CanvasBase&);
static CanvasStyle createFromStringWithOverrideAlpha(const String& color, float alpha, CanvasBase&);
bool isValid() const { return !std::holds_alternative<Invalid>(m_style); }
bool isCurrentColor() const { return std::holds_alternative<CurrentColor>(m_style); }
std::optional<float> overrideAlpha() const { return std::get<CurrentColor>(m_style).overrideAlpha; }
String color() const;
std::optional<Color> srgbaColor() const;
RefPtr<CanvasGradient> canvasGradient() const;
RefPtr<CanvasPattern> canvasPattern() const;
void applyFillColor(GraphicsContext&) const;
void applyStrokeColor(GraphicsContext&) const;
bool isEquivalentColor(const CanvasStyle&) const;
bool isEquivalent(const SRGBA<float>&) const;
private:
struct Invalid { };
struct CurrentColor {
std::optional<float> overrideAlpha;
};
CanvasStyle(CurrentColor);
std::variant<Invalid, Color, RefPtr<CanvasGradient>, RefPtr<CanvasPattern>, CurrentColor> m_style;
};
bool isCurrentColorString(const String& colorString);
Color currentColor(CanvasBase&);
Color parseColor(const String& colorString, CanvasBase&);
Color parseColor(const String& colorString);
Color parseColorOrCurrentColor(const String& colorString, CanvasBase&);
inline CanvasStyle::CanvasStyle()
: m_style(Invalid { })
{
}
inline RefPtr<CanvasGradient> CanvasStyle::canvasGradient() const
{
if (!std::holds_alternative<RefPtr<CanvasGradient>>(m_style))
return nullptr;
return std::get<RefPtr<CanvasGradient>>(m_style);
}
inline RefPtr<CanvasPattern> CanvasStyle::canvasPattern() const
{
if (!std::holds_alternative<RefPtr<CanvasPattern>>(m_style))
return nullptr;
return std::get<RefPtr<CanvasPattern>>(m_style);
}
inline String CanvasStyle::color() const
{
return serializationForHTML(std::get<Color>(m_style));
}
inline std::optional<Color> CanvasStyle::srgbaColor() const
{
return std::holds_alternative<Color>(m_style) ? std::optional { std::get<Color>(m_style) } : std::nullopt;
}
} // namespace WebCore
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