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1 /*
2  * Copyright (C) 2013 Google Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are
6  * met:
7  *
8  *     * Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  *     * Redistributions in binary form must reproduce the above
11  * copyright notice, this list of conditions and the following disclaimer
12  * in the documentation and/or other materials provided with the
13  * distribution.
14  *     * Neither the name of Google Inc. nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 
square(double x)39 double square(double x)
40 {
41     return x * x;
42 }
43 
44 } // namespace
45 
46 namespace blink {
47 
AnimatableColorImpl(float red,float green,float blue,float alpha)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 
AnimatableColorImpl(Color color)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 
toColor() const64 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 
interpolateTo(const AnimatableColorImpl & to,double fraction) const71 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 
operator ==(const AnimatableColorImpl & other) const79 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 
distanceTo(const AnimatableColorImpl & other) const87 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 
create(const AnimatableColorImpl & color,const AnimatableColorImpl & visitedLinkColor)95 PassRefPtrWillBeRawPtr<AnimatableColor> AnimatableColor::create(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
96 {
97     return adoptRefWillBeNoop(new AnimatableColor(color, visitedLinkColor));
98 }
99 
interpolateTo(const AnimatableValue * value,double fraction) const100 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 
equalTo(const AnimatableValue * value) const107 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 
distanceTo(const AnimatableValue * value) const113 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