svganimationelement.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
    Copyright (C) 2004, 2005 Nikolas Zimmermann <[e-mail]>
                  2004, 2005, 2006, 2007 Rob Buis <[e-mail]>
    Copyright (C) 2007 Eric Seidel <[e-mail]>
    Copyright (C) 2008 Apple Inc. All rights reserved.

    This file is part of the KDE project

    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"
#if ENABLE(SVG_ANIMATION)
#include "SVGAnimationElement.h"

#include "CSSComputedStyleDeclaration.h"
#include "CSSParser.h"
#include "CSSPropertyNames.h"
#include "Document.h"
#include "Event.h"
#include "EventListener.h"
#include "FloatConversion.h"
#include "HTMLNames.h"
#include "SVGElementInstance.h"
#include "SVGNames.h"
#include "SVGURIReference.h"
#include "SVGUseElement.h"
#include "XLinkNames.h"
#include <math.h>
#include <wtf/StdLibExtras.h>

using namespace std;

namespace WebCore {
    
SVGAnimationElement::SVGAnimationElement(const QualifiedName& tagName, Document* doc)
    : SVGSMILElement(tagName, doc)
    , SVGTests()
    , SVGExternalResourcesRequired()
    , m_animationValid(false)
{
}

SVGAnimationElement::~SVGAnimationElement()
{
}
    
static void parseKeyTimes(const String& parse, Vector<float>& result, bool verifyOrder)
{
    result.clear();
    Vector<String> parseList;
    parse.split(';', parseList);
    for (unsigned n = 0; n < parseList.size(); ++n) {
        String timeString = parseList[n];
        bool ok;
        float time = timeString.toFloat(&ok);
        if (!ok || time < 0 || time > 1.f)
            goto fail;
        if (verifyOrder) {
            if (!n) {
                if (time != 0)
                    goto fail;
            } else if (time < result.last())
                goto fail;
        }
        result.append(time);
    }
    return;
fail:
    result.clear();
}

static void parseKeySplines(const String& parse, Vector<UnitBezier>& result)
{
    result.clear();
    Vector<String> parseList;
    parse.split(';', parseList);
    for (unsigned n = 0; n < parseList.size(); ++n) {
        Vector<String> parseSpline;
        parseList[n].split(',', parseSpline);
        // The spec says the sepator is a space, all tests use commas. Weird.
        if (parseSpline.size() == 1) 
            parseList[n].split(' ', parseSpline);
        if (parseSpline.size() != 4)
            goto fail;
        double curveValues[4];
        for (unsigned i = 0; i < 4; ++i) {
            String parseNumber = parseSpline[i]; 
            bool ok;
            curveValues[i] = parseNumber.toDouble(&ok);
            if (!ok || curveValues[i] < 0.0 || curveValues[i] > 1.0)
                goto fail;
        }
        result.append(UnitBezier(curveValues[0], curveValues[1], curveValues[2], curveValues[3]));
    }
    return;
fail:
    result.clear();
}

void SVGAnimationElement::parseMappedAttribute(MappedAttribute* attr)
{
    if (attr->name() == SVGNames::valuesAttr)
        attr->value().string().split(';', m_values);
    else if (attr->name() == SVGNames::keyTimesAttr)
        parseKeyTimes(attr->value(), m_keyTimes, true);
    else if (attr->name() == SVGNames::keyPointsAttr && 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(attr->value(), m_keyPoints, false);
    } else if (attr->name() == SVGNames::keySplinesAttr)
        parseKeySplines(attr->value(), m_keySplines);
    else {
        if (SVGTests::parseMappedAttribute(attr))
            return;
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
            return;
        SVGSMILElement::parseMappedAttribute(attr);
    }
}

void SVGAnimationElement::attributeChanged(Attribute* attr, bool preserveDecls)
{
    // Assumptions may not hold after an attribute change.
    m_animationValid = false;
    SVGSMILElement::attributeChanged(attr, preserveDecls);
}

float SVGAnimationElement::getStartTime() const
{
    return narrowPrecisionToFloat(intervalBegin().value());
}

float SVGAnimationElement::getCurrentTime() const
{
    return narrowPrecisionToFloat(elapsed().value());
}

float SVGAnimationElement::getSimpleDuration(ExceptionCode&) const
{
    return narrowPrecisionToFloat(simpleDuration().value());
}    
    
bool SVGAnimationElement::beginElement(ExceptionCode& ec)
{
    return beginElementAt(0, ec);
}

bool SVGAnimationElement::beginElementAt(float offset, ExceptionCode&)
{
    addBeginTime(elapsed() + offset);
    return true;
}

bool SVGAnimationElement::endElement(ExceptionCode& ec)
{
    return endElementAt(0, ec);
}

bool SVGAnimationElement::endElementAt(float offset, ExceptionCode&)
{
    if (offset < 0)
        return false;
    
    addEndTime(elapsed() + offset);
    return true;
}

SVGAnimationElement::AnimationMode SVGAnimationElement::animationMode() const
{
    // http://www.w3.org/TR/2001/REC-smil-animation-20010904/#AnimFuncValues
    if (hasTagName(SVGNames::setTag))
        return ToAnimation;
    if (!animationPath().isEmpty())
        return PathAnimation;
    if (hasAttribute(SVGNames::valuesAttr))
        return ValuesAnimation;
    if (!toValue().isEmpty())
        return fromValue().isEmpty() ? ToAnimation : FromToAnimation;
    if (!byValue().isEmpty())
        return fromValue().isEmpty() ? ByAnimation : FromByAnimation;
    return NoAnimation;
}

SVGAnimationElement::CalcMode SVGAnimationElement::calcMode() const
{    
    DEFINE_STATIC_LOCAL(const AtomicString, discrete, ("discrete"));
    DEFINE_STATIC_LOCAL(const AtomicString, linear, ("linear"));
    DEFINE_STATIC_LOCAL(const AtomicString, paced, ("paced"));
    DEFINE_STATIC_LOCAL(const AtomicString, spline, ("spline"));
    const AtomicString& value = getAttribute(SVGNames::calcModeAttr);
    if (value == discrete)
        return CalcModeDiscrete;
    if (value == linear)
        return CalcModeLinear;
    if (value == paced)
        return CalcModePaced;
    if (value == spline)
        return CalcModeSpline;
    return hasTagName(SVGNames::animateMotionTag) ? CalcModePaced : CalcModeLinear;
}

SVGAnimationElement::AttributeType SVGAnimationElement::attributeType() const
{    
    DEFINE_STATIC_LOCAL(const AtomicString, css, ("CSS"));
    DEFINE_STATIC_LOCAL(const AtomicString, xml, ("XML"));
    const AtomicString& value = getAttribute(SVGNames::attributeTypeAttr);
    if (value == css)
        return AttributeTypeCSS;
    if (value == xml)
        return AttributeTypeXML;
    return AttributeTypeAuto;
}

String SVGAnimationElement::toValue() const
{    
    return getAttribute(SVGNames::toAttr);
}

String SVGAnimationElement::byValue() const
{    
    return getAttribute(SVGNames::byAttr);
}

String SVGAnimationElement::fromValue() const
{    
    return getAttribute(SVGNames::fromAttr);
}

bool SVGAnimationElement::isAdditive() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, sum, ("sum"));
    const AtomicString& value = getAttribute(SVGNames::additiveAttr);
    return value == sum || animationMode() == ByAnimation;
}

bool SVGAnimationElement::isAccumulated() const
{
    DEFINE_STATIC_LOCAL(const AtomicString, sum, ("sum"));
    const AtomicString& value = getAttribute(SVGNames::accumulateAttr);
    return value == sum && animationMode() != ToAnimation;
}

bool SVGAnimationElement::hasValidTarget() const
{
    return targetElement();
}
    
bool SVGAnimationElement::attributeIsCSS(const String& attributeName)
{
    // FIXME: We should have a map of all SVG properties and their attribute types so we
    // could validate animations better. The spec is very vague about this.
    unsigned id = cssPropertyID(attributeName);
    // SVG range
    if (id >= CSSPropertyClipPath && id <= CSSPropertyWritingMode)