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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 <wtf/Variant.h>
namespace WebCore {
class Document;
class GraphicsContext;
class HTMLCanvasElement;
class CanvasStyle {
public:
CanvasStyle();
CanvasStyle(Color);
CanvasStyle(float grayLevel, float alpha);
CanvasStyle(float r, float g, float b, float alpha);
CanvasStyle(float c, float m, float y, float k, float alpha);
CanvasStyle(CanvasGradient&);
CanvasStyle(CanvasPattern&);
static CanvasStyle createFromString(const String& color);
static CanvasStyle createFromStringWithOverrideAlpha(const String& color, float alpha);
bool isValid() const { return !WTF::holds_alternative<Invalid>(m_style); }
bool isCurrentColor() const { return WTF::holds_alternative<CurrentColor>(m_style); }
bool hasOverrideAlpha() const { return isCurrentColor() && WTF::get<CurrentColor>(m_style).overrideAlpha; }
float overrideAlpha() const { return WTF::get<CurrentColor>(m_style).overrideAlpha.value(); }
String color() const;
CanvasGradient* canvasGradient() const;
CanvasPattern* canvasPattern() const;
void applyFillColor(GraphicsContext&) const;
void applyStrokeColor(GraphicsContext&) const;
bool isEquivalentColor(const CanvasStyle&) const;
bool isEquivalentRGBA(float red, float green, float blue, float alpha) const;
bool isEquivalentCMYKA(float cyan, float magenta, float yellow, float black, float alpha) const;
private:
struct Invalid { };
struct CMYKAColor {
CMYKAColor() = default;
CMYKAColor(Color color, float cyan, float magenta, float yellow, float black, float alpha)
: color(color), c(cyan), m(magenta), y(yellow), k(black), a(alpha)
{
}
Color color;
float c { 0 };
float m { 0 };
float y { 0 };
float k { 0 };
float a { 0 };
};
struct CurrentColor {
std::optional<float> overrideAlpha;
};
CanvasStyle(CurrentColor);
Variant<Invalid, Color, CMYKAColor, RefPtr<CanvasGradient>, RefPtr<CanvasPattern>, CurrentColor> m_style;
};
Color currentColor(HTMLCanvasElement*);
Color parseColorOrCurrentColor(const String& colorString, HTMLCanvasElement*);
inline CanvasStyle::CanvasStyle()
: m_style(Invalid { })
{
}
inline CanvasGradient* CanvasStyle::canvasGradient() const
{
if (!WTF::holds_alternative<RefPtr<CanvasGradient>>(m_style))
return nullptr;
return WTF::get<RefPtr<CanvasGradient>>(m_style).get();
}
inline CanvasPattern* CanvasStyle::canvasPattern() const
{
if (!WTF::holds_alternative<RefPtr<CanvasPattern>>(m_style))
return nullptr;
return WTF::get<RefPtr<CanvasPattern>>(m_style).get();
}
inline String CanvasStyle::color() const
{
auto& color = WTF::holds_alternative<Color>(m_style) ? WTF::get<Color>(m_style) : WTF::get<CMYKAColor>(m_style).color;
return color.serialized();
}
} // namespace WebCore
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