Source/core/animation/AnimatableColor.h

/*
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#ifndef AnimatableColor_h
#define AnimatableColor_h

#include "core/animation/AnimatableValue.h"
#include "platform/graphics/Color.h"

namespace WebCore {

class AnimatableColorImpl {
public:
    AnimatableColorImpl(float red, float green, float blue, float alpha);
    AnimatableColorImpl(Color);
    Color toColor() const;
    AnimatableColorImpl interpolateTo(const AnimatableColorImpl&, double fraction) const;
    AnimatableColorImpl addWith(const AnimatableColorImpl&) const;
    bool operator==(const AnimatableColorImpl&) const;

private:
    float m_alpha;
    float m_red;
    float m_green;
    float m_blue;
};

// This class handles both the regular and 'visted link' colors for a given
// property. Currently it is used for all properties, even those which do not
// support a separate 'visited link' color (eg SVG properties). This is correct
// but inefficient.
class AnimatableColor FINAL : public AnimatableValue {
public:
    static PassRefPtr<AnimatableColor> create(const AnimatableColorImpl&, const AnimatableColorImpl& visitedLinkColor);
    Color color() const { return m_color.toColor(); }
    Color visitedLinkColor() const { return m_visitedLinkColor.toColor(); }

protected:
    virtual PassRefPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
    virtual PassRefPtr<AnimatableValue> addWith(const AnimatableValue*) const OVERRIDE;

private:
    AnimatableColor(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
        : m_color(color)
        , m_visitedLinkColor(visitedLinkColor)
    {
    }
    virtual AnimatableType type() const OVERRIDE { return TypeColor; }
    virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
    const AnimatableColorImpl m_color;
    const AnimatableColorImpl m_visitedLinkColor;
};

DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableColor, isColor());

} // namespace WebCore

#endif // AnimatableColor_h