Source/core/animation/AnimatableColor.cpp

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#include "config.h"
#include "core/animation/AnimatableColor.h"

#include "platform/animation/AnimationUtilities.h"
#include "wtf/MathExtras.h"

namespace WebCore {

AnimatableColorImpl::AnimatableColorImpl(float red, float green, float blue, float alpha)
    : m_alpha(clampTo(alpha, 0.0f, 1.0f))
    , m_red(clampTo(red, 0.0f, 1.0f))
    , m_green(clampTo(green, 0.0f, 1.0f))
    , m_blue(clampTo(blue, 0.0f, 1.0f))
{
}

AnimatableColorImpl::AnimatableColorImpl(Color color)
    : m_alpha(color.alpha() / 255.0f)
    , m_red(color.red() / 255.0f * m_alpha)
    , m_green(color.green() / 255.0f * m_alpha)
    , m_blue(color.blue() / 255.0f * m_alpha)
{
}

Color AnimatableColorImpl::toColor() const
{
    if (!m_alpha)
        return Color::transparent;
    return Color(m_red / m_alpha, m_green / m_alpha, m_blue / m_alpha, m_alpha);
}

AnimatableColorImpl AnimatableColorImpl::interpolateTo(const AnimatableColorImpl& to, double fraction) const
{
    return AnimatableColorImpl(blend(m_red, to.m_red, fraction),
        blend(m_green, to.m_green, fraction),
        blend(m_blue, to.m_blue, fraction),
        blend(m_alpha, to.m_alpha, fraction));
}

AnimatableColorImpl AnimatableColorImpl::addWith(const AnimatableColorImpl& addend) const
{
    return AnimatableColorImpl(m_red + addend.m_red,
        m_green + addend.m_green,
        m_blue + addend.m_blue,
        m_alpha + addend.m_alpha);
}

bool AnimatableColorImpl::operator==(const AnimatableColorImpl& other) const
{
    return m_red == other.m_red
        && m_green == other.m_green
        && m_blue == other.m_blue
        && m_alpha == other.m_alpha;
}

PassRefPtr<AnimatableColor> AnimatableColor::create(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
{
    return adoptRef(new AnimatableColor(color, visitedLinkColor));
}

PassRefPtr<AnimatableValue> AnimatableColor::interpolateTo(const AnimatableValue* value, double fraction) const
{
    const AnimatableColor* color = toAnimatableColor(value);
    return create(m_color.interpolateTo(color->m_color, fraction),
        m_visitedLinkColor.interpolateTo(color->m_visitedLinkColor, fraction));
}

PassRefPtr<AnimatableValue> AnimatableColor::addWith(const AnimatableValue* value) const
{
    const AnimatableColor* color = toAnimatableColor(value);
    return create(m_color.addWith(color->m_color),
        m_visitedLinkColor.addWith(color->m_visitedLinkColor));
}

bool AnimatableColor::equalTo(const AnimatableValue* value) const
{
    const AnimatableColor* color = toAnimatableColor(value);
    return m_color == color->m_color && m_visitedLinkColor == color->m_visitedLinkColor;
}

} // namespace WebCore