third_party/WebKit/Source/core/css/StyleColor.h

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#ifndef StyleColor_h
#define StyleColor_h

#include "core/CSSValueKeywords.h"
#include "platform/graphics/Color.h"
#include "wtf/Allocator.h"

namespace blink {

class StyleColor {
    DISALLOW_NEW();
public:
    StyleColor() : m_currentColor(true) { }
    StyleColor(Color color) : m_color(color), m_currentColor(false) { }
    static StyleColor currentColor() { return StyleColor(); }

    bool isCurrentColor() const { return m_currentColor; }
    Color getColor() const { ASSERT(!isCurrentColor()); return m_color; }

    Color resolve(Color currentColor) const { return m_currentColor ? currentColor : m_color; }

    static Color colorFromKeyword(CSSValueID);
    static bool isColorKeyword(CSSValueID);
    static bool isSystemColor(CSSValueID);

private:
    Color m_color;
    bool m_currentColor;
};

inline bool operator==(const StyleColor& a, const StyleColor& b)
{
    if (a.isCurrentColor() || b.isCurrentColor())
        return a.isCurrentColor() && b.isCurrentColor();
    return a.getColor() == b.getColor();
}

inline bool operator!=(const StyleColor& a, const StyleColor& b)
{
    return !(a == b);
}


} // namespace blink

#endif // StyleColor_h