1/*
2 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21
22#include "core/svg/SVGAnimatedColor.h"
23
24#include "core/rendering/RenderObject.h"
25#include "core/svg/ColorDistance.h"
26#include "core/svg/SVGAnimateElement.h"
27#include "core/svg/SVGColor.h"
28
29namespace WebCore {
30
31SVGAnimatedColorAnimator::SVGAnimatedColorAnimator(SVGAnimationElement* animationElement, SVGElement* contextElement)
32    : SVGAnimatedTypeAnimator(AnimatedColor, animationElement, contextElement)
33{
34}
35
36PassOwnPtr<SVGAnimatedType> SVGAnimatedColorAnimator::constructFromString(const String& string)
37{
38    OwnPtr<SVGAnimatedType> animtedType = SVGAnimatedType::createColor(new Color);
39    animtedType->color() = string.isEmpty() ? Color() : SVGColor::colorFromRGBColorString(string);
40    return animtedType.release();
41}
42
43void SVGAnimatedColorAnimator::addAnimatedTypes(SVGAnimatedType* from, SVGAnimatedType* to)
44{
45    ASSERT(from->type() == AnimatedColor);
46    ASSERT(from->type() == to->type());
47    to->color() = ColorDistance::addColors(from->color(), to->color());
48}
49
50static inline void adjustForCurrentColor(SVGElement* targetElement, Color& color)
51{
52    ASSERT(targetElement);
53
54    if (RenderObject* targetRenderer = targetElement->renderer())
55        color = targetRenderer->style()->visitedDependentColor(CSSPropertyColor);
56    else
57        color = Color();
58}
59
60static Color parseColorFromString(SVGAnimationElement*, const String& string)
61{
62    return SVGColor::colorFromRGBColorString(string);
63}
64
65void SVGAnimatedColorAnimator::calculateAnimatedValue(float percentage, unsigned repeatCount, SVGAnimatedType* from, SVGAnimatedType* to, SVGAnimatedType* toAtEndOfDuration, SVGAnimatedType* animated)
66{
67    ASSERT(m_animationElement);
68    ASSERT(m_contextElement);
69
70    Color fromColor = m_animationElement->animationMode() == ToAnimation ? animated->color() : from->color();
71    Color toColor = to->color();
72    const Color& toAtEndOfDurationColor = toAtEndOfDuration->color();
73    Color& animatedColor = animated->color();
74
75    // Apply CSS inheritance rules.
76    m_animationElement->adjustForInheritance<Color>(parseColorFromString, m_animationElement->fromPropertyValueType(), fromColor, m_contextElement);
77    m_animationElement->adjustForInheritance<Color>(parseColorFromString, m_animationElement->toPropertyValueType(), toColor, m_contextElement);
78
79    // Apply <animateColor> rules.
80    if (m_animationElement->fromPropertyValueType() == CurrentColorValue)
81        adjustForCurrentColor(m_contextElement, fromColor);
82    if (m_animationElement->toPropertyValueType() == CurrentColorValue)
83        adjustForCurrentColor(m_contextElement, toColor);
84
85    float animatedRed = animatedColor.red();
86    m_animationElement->animateAdditiveNumber(percentage, repeatCount, fromColor.red(), toColor.red(), toAtEndOfDurationColor.red(), animatedRed);
87
88    float animatedGreen = animatedColor.green();
89    m_animationElement->animateAdditiveNumber(percentage, repeatCount, fromColor.green(), toColor.green(), toAtEndOfDurationColor.green(), animatedGreen);
90
91    float animatedBlue = animatedColor.blue();
92    m_animationElement->animateAdditiveNumber(percentage, repeatCount, fromColor.blue(), toColor.blue(), toAtEndOfDurationColor.blue(), animatedBlue);
93
94    float animatedAlpha = animatedColor.alpha();
95    m_animationElement->animateAdditiveNumber(percentage, repeatCount, fromColor.alpha(), toColor.alpha(), toAtEndOfDurationColor.alpha(), animatedAlpha);
96
97    animatedColor = ColorDistance::clampColor(static_cast<int>(roundf(animatedRed)), static_cast<int>(roundf(animatedGreen)), static_cast<int>(roundf(animatedBlue)), static_cast<int>(roundf(animatedAlpha)));
98}
99
100float SVGAnimatedColorAnimator::calculateDistance(const String& fromString, const String& toString)
101{
102    ASSERT(m_contextElement);
103    Color from = SVGColor::colorFromRGBColorString(fromString);
104    if (!from.isValid())
105        return -1;
106    Color to = SVGColor::colorFromRGBColorString(toString);
107    if (!to.isValid())
108        return -1;
109    return ColorDistance(from, to).distance();
110}
111
112}
113