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/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2017 Apple Inc. All rights reserved.
* Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGAnimationElement.h"
#include "CSSComputedStyleDeclaration.h"
#include "CSSPropertyNames.h"
#include "CSSPropertyParser.h"
#include "Document.h"
#include "FloatConversion.h"
#include "RenderObject.h"
#include "SVGAnimateColorElement.h"
#include "SVGAnimateElement.h"
#include "SVGElement.h"
#include "SVGNames.h"
#include "SVGParserUtilities.h"
#include "SVGStringList.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/MathExtras.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringParsingBuffer.h>
#include <wtf/text/StringView.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(SVGAnimationElement);
SVGAnimationElement::SVGAnimationElement(const QualifiedName& tagName, Document& document)
: SVGSMILElement(tagName, document)
, SVGTests(this)
{
}
static void parseKeyTimes(const String& parse, Vector<float>& result, bool verifyOrder)
{
result.clear();
bool isFirst = true;
for (StringView timeString : StringView(parse).split(';')) {
bool ok;
float time = timeString.toFloat(ok);
if (!ok || time < 0 || time > 1)
goto fail;
if (verifyOrder) {
if (isFirst) {
if (time)
goto fail;
isFirst = false;
} else if (time < result.last())
goto fail;
}
result.append(time);
}
return;
fail:
result.clear();
}
static Optional<Vector<UnitBezier>> parseKeySplines(StringView string)
{
if (string.isEmpty())
return WTF::nullopt;
return readCharactersForParsing(string, [&](auto buffer) -> Optional<Vector<UnitBezier>> {
skipOptionalSVGSpaces(buffer);
Vector<UnitBezier> result;
bool delimParsed = false;
while (buffer.hasCharactersRemaining()) {
delimParsed = false;
auto posA = parseNumber(buffer);
if (!posA)
return WTF::nullopt;
auto posB = parseNumber(buffer);
if (!posB)
return WTF::nullopt;
auto posC = parseNumber(buffer);
if (!posC)
return WTF::nullopt;
auto posD = parseNumber(buffer, SuffixSkippingPolicy::DontSkip);
if (!posD)
return WTF::nullopt;
skipOptionalSVGSpaces(buffer);
if (skipExactly(buffer, ';'))
delimParsed = true;
skipOptionalSVGSpaces(buffer);
result.append(UnitBezier { *posA, *posB, *posC, *posD });
}
if (!(buffer.atEnd() && !delimParsed))
return WTF::nullopt;
return result;
});
}
bool SVGAnimationElement::isSupportedAttribute(const QualifiedName& attrName)
{
static const auto supportedAttributes = makeNeverDestroyed([] {
HashSet<QualifiedName> set;
SVGTests::addSupportedAttributes(set);
set.add({
SVGNames::valuesAttr.get(),
SVGNames::keyTimesAttr.get(),
SVGNames::keyPointsAttr.get(),
SVGNames::keySplinesAttr.get(),
SVGNames::attributeTypeAttr.get(),
SVGNames::calcModeAttr.get(),
SVGNames::fromAttr.get(),
SVGNames::toAttr.get(),
SVGNames::byAttr.get(),
});
return set;
}());
return supportedAttributes.get().contains<SVGAttributeHashTranslator>(attrName);
}
void SVGAnimationElement::parseAttribute(const QualifiedName& name, const AtomString& value)
{
if (name == SVGNames::valuesAttr) {
// Per the SMIL specification, leading and trailing white space,
// and white space before and after semicolon separators, is allowed and will be ignored.
// http://www.w3.org/TR/SVG11/animate.html#ValuesAttribute
m_values = value.string().split(';');
for (auto& value : m_values)
value = value.stripWhiteSpace();
updateAnimationMode();
return;
}
if (name == SVGNames::keyTimesAttr) {
parseKeyTimes(value, m_keyTimes, true);
return;
}
if (name == SVGNames::keyPointsAttr) {
if (hasTagName(SVGNames::animateMotionTag)) {
// This is specified to be an animateMotion attribute only but it is simpler to put it here
// where the other timing calculatations are.
parseKeyTimes(value, m_keyPoints, false);
}
return;
}
if (name == SVGNames::keySplinesAttr) {
if (auto keySplines = parseKeySplines(value))
m_keySplines = WTFMove(*keySplines);
else
m_keySplines.clear();
return;
}
if (name == SVGNames::attributeTypeAttr) {
setAttributeType(value);
return;
}
if (name == SVGNames::calcModeAttr) {
setCalcMode(value);
return;
}
if (name == SVGNames::fromAttr || name == SVGNames::toAttr || name == SVGNames::byAttr) {
updateAnimationMode();
return;
}
SVGSMILElement::parseAttribute(name, value);
SVGTests::parseAttribute(name, value);
}
void SVGAnimationElement::svgAttributeChanged(const QualifiedName& attrName)
{
if (!isSupportedAttribute(attrName)) {
SVGSMILElement::svgAttributeChanged(attrName);
return;
}
animationAttributeChanged();
}
void SVGAnimationElement::animationAttributeChanged()
{
// Assumptions may not hold after an attribute change.
m_animationValid = false;
setInactive();
}
float SVGAnimationElement::getStartTime() const
{
return narrowPrecisionToFloat(intervalBegin().value());
}
float SVGAnimationElement::getCurrentTime() const
{
return narrowPrecisionToFloat(elapsed().value());
}
float SVGAnimationElement::getSimpleDuration() const
{
return narrowPrecisionToFloat(simpleDuration().value());
}
void SVGAnimationElement::beginElement()
{
beginElementAt(0);
}
void SVGAnimationElement::beginElementAt(float offset)
{
if (std::isnan(offset))
return;
SMILTime elapsed = this->elapsed();
addBeginTime(elapsed, elapsed + offset, SMILTimeWithOrigin::ScriptOrigin);
}
void SVGAnimationElement::endElement()
{
endElementAt(0);
}
void SVGAnimationElement::endElementAt(float offset)
{
if (std::isnan(offset))
return;
SMILTime elapsed = this->elapsed();
addEndTime(elapsed, elapsed + offset, SMILTimeWithOrigin::ScriptOrigin);
}
void SVGAnimationElement::updateAnimationMode()
{
// http://www.w3.org/TR/2001/REC-smil-animation-20010904/#AnimFuncValues
if (hasAttribute(SVGNames::valuesAttr))
setAnimationMode(AnimationMode::Values);
else if (!toValue().isEmpty())
setAnimationMode(fromValue().isEmpty() ? AnimationMode::To : AnimationMode::FromTo);
else if (!byValue().isEmpty())
setAnimationMode(fromValue().isEmpty() ? AnimationMode::By : AnimationMode::FromBy);
else
setAnimationMode(AnimationMode::None);
}
void SVGAnimationElement::setCalcMode(const AtomString& calcMode)
{
static MainThreadNeverDestroyed<const AtomString> discrete("discrete", AtomString::ConstructFromLiteral);
static MainThreadNeverDestroyed<const AtomString> linear("linear", AtomString::ConstructFromLiteral);
static MainThreadNeverDestroyed<const AtomString> paced("paced", AtomString::ConstructFromLiteral);
static MainThreadNeverDestroyed<const AtomString> spline("spline", AtomString::ConstructFromLiteral);
if (calcMode == discrete)
setCalcMode(CalcMode::Discrete);
else if (calcMode == linear)
setCalcMode(CalcMode::Linear);
else if (calcMode == paced)
setCalcMode(CalcMode::Paced);
else if (calcMode == spline)
setCalcMode(CalcMode::Spline);
else
setCalcMode(hasTagName(SVGNames::animateMotionTag) ? CalcMode::Paced : CalcMode::Linear);
}
void SVGAnimationElement::setAttributeType(const AtomString& attributeType)
{
static MainThreadNeverDestroyed<const AtomString> css("CSS", AtomString::ConstructFromLiteral);
static MainThreadNeverDestroyed<const AtomString> xml("XML", AtomString::ConstructFromLiteral);
if (attributeType == css)
m_attributeType = AttributeType::CSS;
else if (attributeType == xml)
m_attributeType = AttributeType::XML;
else
m_attributeType = AttributeType::Auto;
}
String SVGAnimationElement::toValue() const
{
return attributeWithoutSynchronization(SVGNames::toAttr);
}
String SVGAnimationElement::byValue() const
{
return attributeWithoutSynchronization(SVGNames::byAttr);
}
String SVGAnimationElement::fromValue() const
{
return attributeWithoutSynchronization(SVGNames::fromAttr);
}
bool SVGAnimationElement::isAdditive() const
{
static MainThreadNeverDestroyed<const AtomString> sum("sum", AtomString::ConstructFromLiteral);
const AtomString& value = attributeWithoutSynchronization(SVGNames::additiveAttr);
return value == sum || animationMode() == AnimationMode::By;
}
bool SVGAnimationElement::isAccumulated() const
{
static MainThreadNeverDestroyed<const AtomString> sum("sum", AtomString::ConstructFromLiteral);
const AtomString& value = attributeWithoutSynchronization(SVGNames::accumulateAttr);
return value == sum && animationMode() != AnimationMode::To;
}
bool SVGAnimationElement::isTargetAttributeCSSProperty(SVGElement* targetElement, const QualifiedName& attributeName)
{
return targetElement->isAnimatedStyleAttribute(attributeName);
}
void SVGAnimationElement::calculateKeyTimesForCalcModePaced()
{
ASSERT(calcMode() == CalcMode::Paced);
ASSERT(animationMode() == AnimationMode::Values);
unsigned valuesCount = m_values.size();
ASSERT(valuesCount >= 1);
if (valuesCount == 1)
return;
// FIXME, webkit.org/b/109010: m_keyTimes should not be modified in this function.
m_keyTimes.clear();
Vector<float> keyTimesForPaced;
float totalDistance = 0;
keyTimesForPaced.append(0);
for (unsigned n = 0; n < valuesCount - 1; ++n) {
// Distance in any units
auto distance = calculateDistance(m_values[n], m_values[n + 1]);
if (!distance)
return;
totalDistance += *distance;
keyTimesForPaced.append(*distance);
}
if (!totalDistance)
return;
// Normalize.
for (unsigned n = 1; n < keyTimesForPaced.size() - 1; ++n)
keyTimesForPaced[n] = keyTimesForPaced[n - 1] + keyTimesForPaced[n] / totalDistance;
keyTimesForPaced[keyTimesForPaced.size() - 1] = 1;
// Use key times calculated based on pacing instead of the user provided ones.
m_keyTimes = keyTimesForPaced;
}
static inline double solveEpsilon(double duration) { return 1 / (200 * duration); }
unsigned SVGAnimationElement::calculateKeyTimesIndex(float percent) const
{
unsigned index;
unsigned keyTimesCount = m_keyTimes.size();
// Compare index + 1 to keyTimesCount because the last keyTimes entry is
// required to be 1, and percent can never exceed 1; i.e., the second last
// keyTimes entry defines the beginning of the final interval
for (index = 1; index + 1 < keyTimesCount; ++index) {
if (m_keyTimes[index] > percent)
break;
}
return --index;
}
float SVGAnimationElement::calculatePercentForSpline(float percent, unsigned splineIndex) const
{
ASSERT(calcMode() == CalcMode::Spline);
ASSERT_WITH_SECURITY_IMPLICATION(splineIndex < m_keySplines.size());
UnitBezier bezier = m_keySplines[splineIndex];
SMILTime duration = simpleDuration();
if (!duration.isFinite())
duration = 100.0;
return narrowPrecisionToFloat(bezier.solve(percent, solveEpsilon(duration.value())));
}
float SVGAnimationElement::calculatePercentFromKeyPoints(float percent) const
{
ASSERT(!m_keyPoints.isEmpty());
ASSERT(calcMode() != CalcMode::Paced);
ASSERT(m_keyTimes.size() > 1);
ASSERT(m_keyPoints.size() == m_keyTimes.size());
if (percent == 1)
return m_keyPoints[m_keyPoints.size() - 1];
unsigned index = calculateKeyTimesIndex(percent);
float fromPercent = m_keyTimes[index];
float toPercent = m_keyTimes[index + 1];
float fromKeyPoint = m_keyPoints[index];
float toKeyPoint = m_keyPoints[index + 1];
if (calcMode() == CalcMode::Discrete)
return fromKeyPoint;
float keyPointPercent = (percent - fromPercent) / (toPercent - fromPercent);
if (calcMode() == CalcMode::Spline) {
ASSERT(m_keySplines.size() == m_keyPoints.size() - 1);
keyPointPercent = calculatePercentForSpline(keyPointPercent, index);
}
return (toKeyPoint - fromKeyPoint) * keyPointPercent + fromKeyPoint;
}
float SVGAnimationElement::calculatePercentForFromTo(float percent) const
{
if (calcMode() == CalcMode::Discrete && m_keyTimes.size() == 2)
return percent > m_keyTimes[1] ? 1 : 0;
return percent;
}
void SVGAnimationElement::currentValuesFromKeyPoints(float percent, float& effectivePercent, String& from, String& to) const
{
ASSERT(!m_keyPoints.isEmpty());
ASSERT(m_keyPoints.size() == m_keyTimes.size());
ASSERT(calcMode() != CalcMode::Paced);
effectivePercent = calculatePercentFromKeyPoints(percent);
unsigned index = effectivePercent == 1 ? m_values.size() - 2 : static_cast<unsigned>(effectivePercent * (m_values.size() - 1));
from = m_values[index];
to = m_values[index + 1];
}
void SVGAnimationElement::currentValuesForValuesAnimation(float percent, float& effectivePercent, String& from, String& to)
{
unsigned valuesCount = m_values.size();
ASSERT(m_animationValid);
ASSERT(valuesCount >= 1);
if (percent == 1 || valuesCount == 1) {
from = m_values[valuesCount - 1];
to = m_values[valuesCount - 1];
effectivePercent = 1;
return;
}
CalcMode calcMode = this->calcMode();
if (is<SVGAnimateElement>(*this) || is<SVGAnimateColorElement>(*this)) {
ASSERT(targetElement());
if (downcast<SVGAnimateElementBase>(*this).isDiscreteAnimator())
calcMode = CalcMode::Discrete;
}
if (!m_keyPoints.isEmpty() && calcMode != CalcMode::Paced)
return currentValuesFromKeyPoints(percent, effectivePercent, from, to);
unsigned keyTimesCount = m_keyTimes.size();
ASSERT(!keyTimesCount || valuesCount == keyTimesCount);
ASSERT(!keyTimesCount || (keyTimesCount > 1 && !m_keyTimes[0]));
unsigned index = calculateKeyTimesIndex(percent);
if (calcMode == CalcMode::Discrete) {
if (!keyTimesCount)
index = static_cast<unsigned>(percent * valuesCount);
from = m_values[index];
to = m_values[index];
effectivePercent = 0;
return;
}
float fromPercent;
float toPercent;
if (keyTimesCount) {
fromPercent = m_keyTimes[index];
toPercent = m_keyTimes[index + 1];
} else {
index = static_cast<unsigned>(floorf(percent * (valuesCount - 1)));
fromPercent = static_cast<float>(index) / (valuesCount - 1);
toPercent = static_cast<float>(index + 1) / (valuesCount - 1);
}
if (index == valuesCount - 1)
--index;
from = m_values[index];
to = m_values[index + 1];
ASSERT_WITH_SECURITY_IMPLICATION(toPercent > fromPercent);
effectivePercent = (percent - fromPercent) / (toPercent - fromPercent);
if (calcMode == CalcMode::Spline) {
ASSERT(m_keySplines.size() == m_values.size() - 1);
effectivePercent = calculatePercentForSpline(effectivePercent, index);
}
}
void SVGAnimationElement::startedActiveInterval()
{
m_animationValid = false;
if (!hasValidAttributeType())
return;
// These validations are appropriate for all animation modes.
if (hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) && m_keyPoints.size() != m_keyTimes.size())
return;
AnimationMode animationMode = this->animationMode();
CalcMode calcMode = this->calcMode();
if (calcMode == CalcMode::Spline) {
unsigned splinesCount = m_keySplines.size();
if (!splinesCount
|| (hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) && m_keyPoints.size() - 1 != splinesCount)
|| (animationMode == AnimationMode::Values && m_values.size() - 1 != splinesCount)
|| (hasAttributeWithoutSynchronization(SVGNames::keyTimesAttr) && m_keyTimes.size() - 1 != splinesCount))
return;
}
String from = fromValue();
String to = toValue();
String by = byValue();
if (animationMode == AnimationMode::None)
return;
if ((animationMode == AnimationMode::FromTo || animationMode == AnimationMode::FromBy || animationMode == AnimationMode::To || animationMode == AnimationMode::By)
&& (hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) && hasAttributeWithoutSynchronization(SVGNames::keyTimesAttr) && (m_keyTimes.size() < 2 || m_keyTimes.size() != m_keyPoints.size())))
return;
if (animationMode == AnimationMode::FromTo)
m_animationValid = calculateFromAndToValues(from, to);
else if (animationMode == AnimationMode::To) {
// For to-animations the from value is the current accumulated value from lower priority animations.
// The value is not static and is determined during the animation.
m_animationValid = calculateFromAndToValues(emptyString(), to);
} else if (animationMode == AnimationMode::FromBy)
m_animationValid = calculateFromAndByValues(from, by);
else if (animationMode == AnimationMode::By)
m_animationValid = calculateFromAndByValues(emptyString(), by);
else if (animationMode == AnimationMode::Values) {
m_animationValid = m_values.size() >= 1
&& (calcMode == CalcMode::Paced || !hasAttributeWithoutSynchronization(SVGNames::keyTimesAttr) || hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) || (m_values.size() == m_keyTimes.size()))
&& (calcMode == CalcMode::Discrete || !m_keyTimes.size() || m_keyTimes.last() == 1)
&& (calcMode != CalcMode::Spline || ((m_keySplines.size() && (m_keySplines.size() == m_values.size() - 1)) || m_keySplines.size() == m_keyPoints.size() - 1))
&& (!hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) || (m_keyTimes.size() > 1 && m_keyTimes.size() == m_keyPoints.size()));
if (m_animationValid)
m_animationValid = calculateToAtEndOfDurationValue(m_values.last());
if (calcMode == CalcMode::Paced && m_animationValid)
calculateKeyTimesForCalcModePaced();
} else if (animationMode == AnimationMode::Path)
m_animationValid = calcMode == CalcMode::Paced || !hasAttributeWithoutSynchronization(SVGNames::keyPointsAttr) || (m_keyTimes.size() > 1 && m_keyTimes.size() == m_keyPoints.size());
}
void SVGAnimationElement::updateAnimation(float percent, unsigned repeatCount)
{
if (!m_animationValid)
return;
float effectivePercent;
CalcMode calcMode = this->calcMode();
AnimationMode animationMode = this->animationMode();
if (animationMode == AnimationMode::Values) {
String from;
String to;
currentValuesForValuesAnimation(percent, effectivePercent, from, to);
if (from != m_lastValuesAnimationFrom || to != m_lastValuesAnimationTo) {
m_animationValid = calculateFromAndToValues(from, to);
if (!m_animationValid)
return;
m_lastValuesAnimationFrom = from;
m_lastValuesAnimationTo = to;
}
} else if (!m_keyPoints.isEmpty() && calcMode != CalcMode::Paced)
effectivePercent = calculatePercentFromKeyPoints(percent);
else if (m_keyPoints.isEmpty() && calcMode == CalcMode::Spline && m_keyTimes.size() > 1)
effectivePercent = calculatePercentForSpline(percent, calculateKeyTimesIndex(percent));
else if (animationMode == AnimationMode::FromTo || animationMode == AnimationMode::To)
effectivePercent = calculatePercentForFromTo(percent);
else
effectivePercent = percent;
calculateAnimatedValue(effectivePercent, repeatCount);
}
void SVGAnimationElement::computeCSSPropertyValue(SVGElement* element, CSSPropertyID id, String& valueString)
{
ASSERT(element);
// Don't include any properties resulting from CSS Transitions/Animations or SMIL animations, as we want to retrieve the "base value".
element->setUseOverrideComputedStyle(true);
RefPtr<CSSValue> value = ComputedStyleExtractor(element).propertyValue(id);
valueString = value ? value->cssText() : String();
element->setUseOverrideComputedStyle(false);
}
static bool inheritsFromProperty(SVGElement* targetElement, const QualifiedName& attributeName, const String& value)
{
static MainThreadNeverDestroyed<const AtomString> inherit("inherit", AtomString::ConstructFromLiteral);
if (value.isEmpty() || value != inherit)
return false;
return targetElement->isAnimatedStyleAttribute(attributeName);
}
void SVGAnimationElement::determinePropertyValueTypes(const String& from, const String& to)
{
auto targetElement = makeRefPtr(this->targetElement());
ASSERT(targetElement);
const QualifiedName& attributeName = this->attributeName();
if (inheritsFromProperty(targetElement.get(), attributeName, from))
m_fromPropertyValueType = InheritValue;
if (inheritsFromProperty(targetElement.get(), attributeName, to))
m_toPropertyValueType = InheritValue;
}
void SVGAnimationElement::resetAnimation()
{
m_lastValuesAnimationFrom = String();
m_lastValuesAnimationTo = String();
}
}