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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 <optional>
#include <variant>
namespace WebCore {
class CanvasBase;
class Document;
class GraphicsContext;
class ScriptExecutionContext;
class CanvasStyle {
public:
CanvasStyle(Color);
CanvasStyle(const SRGBA<float>&);
CanvasStyle(CanvasGradient&);
CanvasStyle(CanvasPattern&);
static std::optional<CanvasStyle> createFromString(const String& color, CanvasBase&);
static std::optional<CanvasStyle> createFromStringWithOverrideAlpha(const String& color, float alpha, CanvasBase&);
String color() 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;
template<typename... F>
decltype(auto) visit(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
return WTF::switchOn(m_style,
[&](const Color& color) {
return visitor(serializationForHTML(color));
},
[&](const Ref<CanvasGradient>& gradient) {
return visitor(gradient);
},
[&](const Ref<CanvasPattern>& pattern) {
return visitor(pattern);
}
);
}
private:
std::variant<Color, Ref<CanvasGradient>, Ref<CanvasPattern>> m_style;
};
Color parseColor(const String& colorString, CanvasBase&);
Color parseColor(const String& colorString, ScriptExecutionContext&);
inline RefPtr<CanvasGradient> CanvasStyle::canvasGradient() const
{
if (!std::holds_alternative<Ref<CanvasGradient>>(m_style))
return nullptr;
return std::get<Ref<CanvasGradient>>(m_style).ptr();
}
inline RefPtr<CanvasPattern> CanvasStyle::canvasPattern() const
{
if (!std::holds_alternative<Ref<CanvasPattern>>(m_style))
return nullptr;
return std::get<Ref<CanvasPattern>>(m_style).ptr();
}
inline String CanvasStyle::color() const
{
if (!std::holds_alternative<Color>(m_style))
return String();
return serializationForHTML(std::get<Color>(m_style));
}
} // namespace WebCore
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