Source/WebCore/svg/properties/SVGAnimationAdditiveValueFunctionImpl.h - WebKit - Git at Google

 /*
  * Copyright (C) 2018-2019 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #pragma once

 #include "Color.h"
 #include "FloatRect.h"
 #include "SVGAngleValue.h"
 #include "SVGAnimationAdditiveValueFunction.h"
 #include "SVGLengthContext.h"
 #include "SVGLengthValue.h"
 #include "SVGPathByteStream.h"
 #include "SVGPropertyTraits.h"

 namespace WebCore {

 class SVGAnimationAngleFunction : public SVGAnimationAdditiveValueFunction<SVGAngleValue> {
 public:
     using Base = SVGAnimationAdditiveValueFunction<SVGAngleValue>;
     using Base::Base;

     void setFromAndToValues(SVGElement*, const String&, const String&) override
     {
         // Values will be set by SVGAnimatedAngleOrientAnimator.
         ASSERT_NOT_REACHED();
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, SVGAngleValue& animated)
     {
         float number = animated.value();
         number = Base::animate(progress, repeatCount, m_from.value(), m_to.value(), toAtEndOfDuration().value(), number);
         animated.setValue(number);
     }

 private:
     friend class SVGAnimatedAngleOrientAnimator;

     void addFromAndToValues(SVGElement*) override
     {
         m_to.setValue(m_to.value() + m_from.value());
     }
 };

 class SVGAnimationColorFunction : public SVGAnimationAdditiveValueFunction<Color> {
 public:
     using Base = SVGAnimationAdditiveValueFunction<Color>;
     using Base::Base;

     void setFromAndToValues(SVGElement* targetElement, const String& from, const String& to) override
     {
         m_from = colorFromString(targetElement, from);
         m_to = colorFromString(targetElement, to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGPropertyTraits<Color>::fromString(toAtEndOfDuration);
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, Color& animated)
     {
         Color from = m_animationMode == AnimationMode::To ? animated : m_from;

         float red = Base::animate(progress, repeatCount, from.red(), m_to.red(), toAtEndOfDuration().red(), animated.red());
         float green = Base::animate(progress, repeatCount, from.green(), m_to.green(), toAtEndOfDuration().green(), animated.green());
         float blue = Base::animate(progress, repeatCount, from.blue(), m_to.blue(), toAtEndOfDuration().blue(), animated.blue());
         float alpha = Base::animate(progress, repeatCount, from.alpha(), m_to.alpha(), toAtEndOfDuration().alpha(), animated.alpha());

         animated = { roundAndClampColorChannel(red), roundAndClampColorChannel(green), roundAndClampColorChannel(blue), roundAndClampColorChannel(alpha) };
     }

     Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
     {
         Color fromColor = CSSParser::parseColor(from.stripWhiteSpace());
         if (!fromColor.isValid())
             return { };
         Color toColor = CSSParser::parseColor(to.stripWhiteSpace());
         if (!toColor.isValid())
             return { };
         float red = fromColor.red() - toColor.red();
         float green = fromColor.green() - toColor.green();
         float blue = fromColor.blue() - toColor.blue();
         return sqrtf(red * red + green * green + blue * blue);
     }

 private:
     void addFromAndToValues(SVGElement*) override
     {
         // Ignores any alpha and sets alpha on result to 100% opaque.
         m_to = {
             roundAndClampColorChannel(m_to.red() + m_from.red()),
             roundAndClampColorChannel(m_to.green() + m_from.green()),
             roundAndClampColorChannel(m_to.blue() + m_from.blue())
         };
     }

     static Color colorFromString(SVGElement*, const String&);
 };

 class SVGAnimationIntegerFunction : public SVGAnimationAdditiveValueFunction<int> {
     friend class SVGAnimatedIntegerPairAnimator;

 public:
     using Base = SVGAnimationAdditiveValueFunction<int>;
     using Base::Base;

     void setFromAndToValues(SVGElement*, const String& from, const String& to) override
     {
         m_from = SVGPropertyTraits<int>::fromString(from);
         m_to = SVGPropertyTraits<int>::fromString(to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGPropertyTraits<int>::fromString(toAtEndOfDuration);
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, int& animated)
     {
         animated = static_cast<int>(roundf(Base::animate(progress, repeatCount, m_from, m_to, toAtEndOfDuration(), animated)));
     }

     Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
     {
         return std::abs(to.toIntStrict() - from.toIntStrict());
     }

 private:
     void addFromAndToValues(SVGElement*) override
     {
         m_to += m_from;
     }
 };

 class SVGAnimationLengthFunction : public SVGAnimationAdditiveValueFunction<SVGLengthValue> {
     using Base = SVGAnimationAdditiveValueFunction<SVGLengthValue>;

 public:
     SVGAnimationLengthFunction(AnimationMode animationMode, CalcMode calcMode, bool isAccumulated, bool isAdditive, SVGLengthMode lengthMode)
         : Base(animationMode, calcMode, isAccumulated, isAdditive)
         , m_lengthMode(lengthMode)
     {
     }

     void setFromAndToValues(SVGElement*, const String& from, const String& to) override
     {
         m_from = SVGLengthValue(m_lengthMode, from);
         m_to = SVGLengthValue(m_lengthMode, to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGLengthValue(m_lengthMode, toAtEndOfDuration);
     }

     void animate(SVGElement* targetElement, float progress, unsigned repeatCount, SVGLengthValue& animated)
     {
         SVGLengthContext lengthContext(targetElement);
         SVGLengthType lengthType = progress < 0.5 ? m_from.lengthType() : m_to.lengthType();

         float from = (m_animationMode == AnimationMode::To ? animated : m_from).value(lengthContext);
         float to = m_to.value(lengthContext);
         float toAtEndOfDuration = this->toAtEndOfDuration().value(lengthContext);
         float value = animated.value(lengthContext);

         value = Base::animate(progress, repeatCount, from, to, toAtEndOfDuration, value);
         animated = { lengthContext, value, lengthType, m_lengthMode };
     }

     Optional<float> calculateDistance(SVGElement* targetElement, const String& from, const String& to) const override
     {
         SVGLengthContext lengthContext(targetElement);
         auto fromLength = SVGLengthValue(m_lengthMode, from);
         auto toLength = SVGLengthValue(m_lengthMode, to);
         return fabsf(toLength.value(lengthContext) - fromLength.value(lengthContext));
     }

 private:
     void addFromAndToValues(SVGElement* targetElement) override
     {
         SVGLengthContext lengthContext(targetElement);
         m_to.setValue(lengthContext, m_to.value(lengthContext) + m_from.value(lengthContext));
     }

     SVGLengthMode m_lengthMode;
 };

 class SVGAnimationNumberFunction : public SVGAnimationAdditiveValueFunction<float> {
     friend class SVGAnimatedNumberPairAnimator;

 public:
     using Base = SVGAnimationAdditiveValueFunction<float>;
     using Base::Base;

     void setFromAndToValues(SVGElement*, const String& from, const String& to) override
     {
         m_from = SVGPropertyTraits<float>::fromString(from);
         m_to = SVGPropertyTraits<float>::fromString(to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGPropertyTraits<float>::fromString(toAtEndOfDuration);
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, float& animated)
     {
         float from = m_animationMode == AnimationMode::To ? animated : m_from;
         animated = Base::animate(progress, repeatCount, from, m_to, toAtEndOfDuration(), animated);
     }

     Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
     {
         float fromNumber = 0;
         float toNumber = 0;
         parseNumberFromString(from, fromNumber);
         parseNumberFromString(to, toNumber);
         return fabsf(toNumber - fromNumber);
     }

 private:
     void addFromAndToValues(SVGElement*) override
     {
         m_to += m_from;
     }
 };

 class SVGAnimationPathSegListFunction : public SVGAnimationAdditiveValueFunction<SVGPathByteStream> {
 public:
     using Base = SVGAnimationAdditiveValueFunction<SVGPathByteStream>;
     using Base::Base;

     void setFromAndToValues(SVGElement*, const String& from, const String& to) override
     {
         m_from = SVGPathByteStream(from);
         m_to = SVGPathByteStream(to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGPathByteStream(toAtEndOfDuration);
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, SVGPathByteStream& animated)
     {
         SVGPathByteStream underlyingPath;
         if (m_animationMode == AnimationMode::To)
             underlyingPath = animated;

         const SVGPathByteStream& from = m_animationMode == AnimationMode::To ? underlyingPath : m_from;

         // Cache the current animated value before the buildAnimatedSVGPathByteStream() clears animatedPath.
         SVGPathByteStream lastAnimated;
         if (!from.size() || (m_isAdditive && m_animationMode != AnimationMode::To))
             lastAnimated = animated;

         buildAnimatedSVGPathByteStream(from, m_to, animated, progress);

         // Handle additive='sum'.
         if (!lastAnimated.isEmpty())
             addToSVGPathByteStream(animated, lastAnimated);

         // Handle accumulate='sum'.
         if (m_isAccumulated && repeatCount)
             addToSVGPathByteStream(animated, toAtEndOfDuration(), repeatCount);
     }

 private:
     void addFromAndToValues(SVGElement*) override
     {
         if (!m_from.size() || m_from.size() != m_to.size())
             return;
         addToSVGPathByteStream(m_to, m_from);
     }
 };

 class SVGAnimationRectFunction : public SVGAnimationAdditiveValueFunction<FloatRect> {
 public:
     using Base = SVGAnimationAdditiveValueFunction<FloatRect>;
     using Base::Base;

     void setFromAndToValues(SVGElement*, const String& from, const String& to) override
     {
         m_from = SVGPropertyTraits<FloatRect>::fromString(from);
         m_to = SVGPropertyTraits<FloatRect>::fromString(to);
     }

     void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
     {
         m_toAtEndOfDuration = SVGPropertyTraits<FloatRect>::fromString(toAtEndOfDuration);
     }

     void animate(SVGElement*, float progress, unsigned repeatCount, FloatRect& animated)
     {
         FloatRect from = m_animationMode == AnimationMode::To ? animated : m_from;

         float x = Base::animate(progress, repeatCount, from.x(), m_to.x(), toAtEndOfDuration().x(), animated.x());
         float y = Base::animate(progress, repeatCount, from.y(), m_to.y(), toAtEndOfDuration().y(), animated.y());
         float width = Base::animate(progress, repeatCount, from.width(), m_to.width(), toAtEndOfDuration().width(), animated.width());
         float height = Base::animate(progress, repeatCount, from.height(), m_to.height(), toAtEndOfDuration().height(), animated.height());

         animated = { x, y, width, height };
     }

 private:
     void addFromAndToValues(SVGElement*) override
     {
         m_to += m_from;
     }
 };

 }
	/*
	* Copyright (C) 2018-2019 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#pragma once

	#include "Color.h"
	#include "FloatRect.h"
	#include "SVGAngleValue.h"
	#include "SVGAnimationAdditiveValueFunction.h"
	#include "SVGLengthContext.h"
	#include "SVGLengthValue.h"
	#include "SVGPathByteStream.h"
	#include "SVGPropertyTraits.h"

	namespace WebCore {

	class SVGAnimationAngleFunction : public SVGAnimationAdditiveValueFunction<SVGAngleValue> {
	public:
	using Base = SVGAnimationAdditiveValueFunction<SVGAngleValue>;
	using Base::Base;

	void setFromAndToValues(SVGElement*, const String&, const String&) override
	{
	// Values will be set by SVGAnimatedAngleOrientAnimator.
	ASSERT_NOT_REACHED();
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, SVGAngleValue& animated)
	{
	float number = animated.value();
	number = Base::animate(progress, repeatCount, m_from.value(), m_to.value(), toAtEndOfDuration().value(), number);
	animated.setValue(number);
	}

	private:
	friend class SVGAnimatedAngleOrientAnimator;

	void addFromAndToValues(SVGElement*) override
	{
	m_to.setValue(m_to.value() + m_from.value());
	}
	};

	class SVGAnimationColorFunction : public SVGAnimationAdditiveValueFunction<Color> {
	public:
	using Base = SVGAnimationAdditiveValueFunction<Color>;
	using Base::Base;

	void setFromAndToValues(SVGElement* targetElement, const String& from, const String& to) override
	{
	m_from = colorFromString(targetElement, from);
	m_to = colorFromString(targetElement, to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGPropertyTraits<Color>::fromString(toAtEndOfDuration);
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, Color& animated)
	{
	Color from = m_animationMode == AnimationMode::To ? animated : m_from;

	float red = Base::animate(progress, repeatCount, from.red(), m_to.red(), toAtEndOfDuration().red(), animated.red());
	float green = Base::animate(progress, repeatCount, from.green(), m_to.green(), toAtEndOfDuration().green(), animated.green());
	float blue = Base::animate(progress, repeatCount, from.blue(), m_to.blue(), toAtEndOfDuration().blue(), animated.blue());
	float alpha = Base::animate(progress, repeatCount, from.alpha(), m_to.alpha(), toAtEndOfDuration().alpha(), animated.alpha());

	animated = { roundAndClampColorChannel(red), roundAndClampColorChannel(green), roundAndClampColorChannel(blue), roundAndClampColorChannel(alpha) };
	}

	Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
	{
	Color fromColor = CSSParser::parseColor(from.stripWhiteSpace());
	if (!fromColor.isValid())
	return { };
	Color toColor = CSSParser::parseColor(to.stripWhiteSpace());
	if (!toColor.isValid())
	return { };
	float red = fromColor.red() - toColor.red();
	float green = fromColor.green() - toColor.green();
	float blue = fromColor.blue() - toColor.blue();
	return sqrtf(red * red + green * green + blue * blue);
	}

	private:
	void addFromAndToValues(SVGElement*) override
	{
	// Ignores any alpha and sets alpha on result to 100% opaque.
	m_to = {
	roundAndClampColorChannel(m_to.red() + m_from.red()),
	roundAndClampColorChannel(m_to.green() + m_from.green()),
	roundAndClampColorChannel(m_to.blue() + m_from.blue())
	};
	}

	static Color colorFromString(SVGElement*, const String&);
	};

	class SVGAnimationIntegerFunction : public SVGAnimationAdditiveValueFunction<int> {
	friend class SVGAnimatedIntegerPairAnimator;

	public:
	using Base = SVGAnimationAdditiveValueFunction<int>;
	using Base::Base;

	void setFromAndToValues(SVGElement*, const String& from, const String& to) override
	{
	m_from = SVGPropertyTraits<int>::fromString(from);
	m_to = SVGPropertyTraits<int>::fromString(to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGPropertyTraits<int>::fromString(toAtEndOfDuration);
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, int& animated)
	{
	animated = static_cast<int>(roundf(Base::animate(progress, repeatCount, m_from, m_to, toAtEndOfDuration(), animated)));
	}

	Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
	{
	return std::abs(to.toIntStrict() - from.toIntStrict());
	}

	private:
	void addFromAndToValues(SVGElement*) override
	{
	m_to += m_from;
	}
	};

	class SVGAnimationLengthFunction : public SVGAnimationAdditiveValueFunction<SVGLengthValue> {
	using Base = SVGAnimationAdditiveValueFunction<SVGLengthValue>;

	public:
	SVGAnimationLengthFunction(AnimationMode animationMode, CalcMode calcMode, bool isAccumulated, bool isAdditive, SVGLengthMode lengthMode)
	: Base(animationMode, calcMode, isAccumulated, isAdditive)
	, m_lengthMode(lengthMode)
	{
	}

	void setFromAndToValues(SVGElement*, const String& from, const String& to) override
	{
	m_from = SVGLengthValue(m_lengthMode, from);
	m_to = SVGLengthValue(m_lengthMode, to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGLengthValue(m_lengthMode, toAtEndOfDuration);
	}

	void animate(SVGElement* targetElement, float progress, unsigned repeatCount, SVGLengthValue& animated)
	{
	SVGLengthContext lengthContext(targetElement);
	SVGLengthType lengthType = progress < 0.5 ? m_from.lengthType() : m_to.lengthType();

	float from = (m_animationMode == AnimationMode::To ? animated : m_from).value(lengthContext);
	float to = m_to.value(lengthContext);
	float toAtEndOfDuration = this->toAtEndOfDuration().value(lengthContext);
	float value = animated.value(lengthContext);

	value = Base::animate(progress, repeatCount, from, to, toAtEndOfDuration, value);
	animated = { lengthContext, value, lengthType, m_lengthMode };
	}

	Optional<float> calculateDistance(SVGElement* targetElement, const String& from, const String& to) const override
	{
	SVGLengthContext lengthContext(targetElement);
	auto fromLength = SVGLengthValue(m_lengthMode, from);
	auto toLength = SVGLengthValue(m_lengthMode, to);
	return fabsf(toLength.value(lengthContext) - fromLength.value(lengthContext));
	}

	private:
	void addFromAndToValues(SVGElement* targetElement) override
	{
	SVGLengthContext lengthContext(targetElement);
	m_to.setValue(lengthContext, m_to.value(lengthContext) + m_from.value(lengthContext));
	}

	SVGLengthMode m_lengthMode;
	};

	class SVGAnimationNumberFunction : public SVGAnimationAdditiveValueFunction<float> {
	friend class SVGAnimatedNumberPairAnimator;

	public:
	using Base = SVGAnimationAdditiveValueFunction<float>;
	using Base::Base;

	void setFromAndToValues(SVGElement*, const String& from, const String& to) override
	{
	m_from = SVGPropertyTraits<float>::fromString(from);
	m_to = SVGPropertyTraits<float>::fromString(to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGPropertyTraits<float>::fromString(toAtEndOfDuration);
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, float& animated)
	{
	float from = m_animationMode == AnimationMode::To ? animated : m_from;
	animated = Base::animate(progress, repeatCount, from, m_to, toAtEndOfDuration(), animated);
	}

	Optional<float> calculateDistance(SVGElement*, const String& from, const String& to) const override
	{
	float fromNumber = 0;
	float toNumber = 0;
	parseNumberFromString(from, fromNumber);
	parseNumberFromString(to, toNumber);
	return fabsf(toNumber - fromNumber);
	}

	private:
	void addFromAndToValues(SVGElement*) override
	{
	m_to += m_from;
	}
	};

	class SVGAnimationPathSegListFunction : public SVGAnimationAdditiveValueFunction<SVGPathByteStream> {
	public:
	using Base = SVGAnimationAdditiveValueFunction<SVGPathByteStream>;
	using Base::Base;

	void setFromAndToValues(SVGElement*, const String& from, const String& to) override
	{
	m_from = SVGPathByteStream(from);
	m_to = SVGPathByteStream(to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGPathByteStream(toAtEndOfDuration);
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, SVGPathByteStream& animated)
	{
	SVGPathByteStream underlyingPath;
	if (m_animationMode == AnimationMode::To)
	underlyingPath = animated;

	const SVGPathByteStream& from = m_animationMode == AnimationMode::To ? underlyingPath : m_from;

	// Cache the current animated value before the buildAnimatedSVGPathByteStream() clears animatedPath.
	SVGPathByteStream lastAnimated;
	if (!from.size() \|\| (m_isAdditive && m_animationMode != AnimationMode::To))
	lastAnimated = animated;

	buildAnimatedSVGPathByteStream(from, m_to, animated, progress);

	// Handle additive='sum'.
	if (!lastAnimated.isEmpty())
	addToSVGPathByteStream(animated, lastAnimated);

	// Handle accumulate='sum'.
	if (m_isAccumulated && repeatCount)
	addToSVGPathByteStream(animated, toAtEndOfDuration(), repeatCount);
	}

	private:
	void addFromAndToValues(SVGElement*) override
	{
	if (!m_from.size() \|\| m_from.size() != m_to.size())
	return;
	addToSVGPathByteStream(m_to, m_from);
	}
	};

	class SVGAnimationRectFunction : public SVGAnimationAdditiveValueFunction<FloatRect> {
	public:
	using Base = SVGAnimationAdditiveValueFunction<FloatRect>;
	using Base::Base;

	void setFromAndToValues(SVGElement*, const String& from, const String& to) override
	{
	m_from = SVGPropertyTraits<FloatRect>::fromString(from);
	m_to = SVGPropertyTraits<FloatRect>::fromString(to);
	}

	void setToAtEndOfDurationValue(const String& toAtEndOfDuration) override
	{
	m_toAtEndOfDuration = SVGPropertyTraits<FloatRect>::fromString(toAtEndOfDuration);
	}

	void animate(SVGElement*, float progress, unsigned repeatCount, FloatRect& animated)
	{
	FloatRect from = m_animationMode == AnimationMode::To ? animated : m_from;

	float x = Base::animate(progress, repeatCount, from.x(), m_to.x(), toAtEndOfDuration().x(), animated.x());
	float y = Base::animate(progress, repeatCount, from.y(), m_to.y(), toAtEndOfDuration().y(), animated.y());
	float width = Base::animate(progress, repeatCount, from.width(), m_to.width(), toAtEndOfDuration().width(), animated.width());
	float height = Base::animate(progress, repeatCount, from.height(), m_to.height(), toAtEndOfDuration().height(), animated.height());

	animated = { x, y, width, height };
	}

	private:
	void addFromAndToValues(SVGElement*) override
	{
	m_to += m_from;
	}
	};

	}