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
37namespace {
38
39double square(double x)
40{
41    return x * x;
42}
43
44} // namespace
45
46namespace blink {
47
48AnimatableColorImpl::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
56AnimatableColorImpl::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
64Color 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
71AnimatableColorImpl 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
79bool 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
87double 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
95PassRefPtrWillBeRawPtr<AnimatableColor> AnimatableColor::create(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
96{
97    return adoptRefWillBeNoop(new AnimatableColor(color, visitedLinkColor));
98}
99
100PassRefPtrWillBeRawPtr<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
107bool 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
113double 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