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      1 /*
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     29  */
     30 
     31 #include "config.h"
     32 #include "core/animation/animatable/AnimatableColor.h"
     33 
     34 #include "platform/animation/AnimationUtilities.h"
     35 #include "wtf/MathExtras.h"
     36 
     37 namespace {
     38 
     39 double square(double x)
     40 {
     41     return x * x;
     42 }
     43 
     44 } // namespace
     45 
     46 namespace blink {
     47 
     48 AnimatableColorImpl::AnimatableColorImpl(float red, float green, float blue, float alpha)
     49     : m_alpha(clampTo(alpha, 0.0f, 1.0f))
     50     , m_red(clampTo(red, 0.0f, 1.0f))
     51     , m_green(clampTo(green, 0.0f, 1.0f))
     52     , m_blue(clampTo(blue, 0.0f, 1.0f))
     53 {
     54 }
     55 
     56 AnimatableColorImpl::AnimatableColorImpl(Color color)
     57     : m_alpha(color.alpha() / 255.0f)
     58     , m_red(color.red() / 255.0f * m_alpha)
     59     , m_green(color.green() / 255.0f * m_alpha)
     60     , m_blue(color.blue() / 255.0f * m_alpha)
     61 {
     62 }
     63 
     64 Color AnimatableColorImpl::toColor() const
     65 {
     66     if (!m_alpha)
     67         return Color::transparent;
     68     return Color(m_red / m_alpha, m_green / m_alpha, m_blue / m_alpha, m_alpha);
     69 }
     70 
     71 AnimatableColorImpl AnimatableColorImpl::interpolateTo(const AnimatableColorImpl& to, double fraction) const
     72 {
     73     return AnimatableColorImpl(blend(m_red, to.m_red, fraction),
     74         blend(m_green, to.m_green, fraction),
     75         blend(m_blue, to.m_blue, fraction),
     76         blend(m_alpha, to.m_alpha, fraction));
     77 }
     78 
     79 bool AnimatableColorImpl::operator==(const AnimatableColorImpl& other) const
     80 {
     81     return m_red == other.m_red
     82         && m_green == other.m_green
     83         && m_blue == other.m_blue
     84         && m_alpha == other.m_alpha;
     85 }
     86 
     87 double AnimatableColorImpl::distanceTo(const AnimatableColorImpl& other) const
     88 {
     89     return sqrt(square(m_red - other.m_red)
     90         + square(m_green - other.m_green)
     91         + square(m_blue - other.m_blue)
     92         + square(m_alpha - other.m_alpha));
     93 }
     94 
     95 PassRefPtrWillBeRawPtr<AnimatableColor> AnimatableColor::create(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
     96 {
     97     return adoptRefWillBeNoop(new AnimatableColor(color, visitedLinkColor));
     98 }
     99 
    100 PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableColor::interpolateTo(const AnimatableValue* value, double fraction) const
    101 {
    102     const AnimatableColor* color = toAnimatableColor(value);
    103     return create(m_color.interpolateTo(color->m_color, fraction),
    104         m_visitedLinkColor.interpolateTo(color->m_visitedLinkColor, fraction));
    105 }
    106 
    107 bool AnimatableColor::equalTo(const AnimatableValue* value) const
    108 {
    109     const AnimatableColor* color = toAnimatableColor(value);
    110     return m_color == color->m_color && m_visitedLinkColor == color->m_visitedLinkColor;
    111 }
    112 
    113 double AnimatableColor::distanceTo(const AnimatableValue* value) const
    114 {
    115     const AnimatableColor* color = toAnimatableColor(value);
    116     return m_color.distanceTo(color->m_color);
    117 }
    118 
    119 } // namespace blink
    120