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/*
* Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
*
* 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.
*/
#pragma once
#include "AnimationUtilities.h"
#include "SVGLengthContext.h"
#include "SVGParsingError.h"
#include "SVGPropertyTraits.h"
namespace WebCore {
class CSSPrimitiveValue;
class QualifiedName;
enum SVGLengthNegativeValuesMode {
AllowNegativeLengths,
ForbidNegativeLengths
};
class SVGLengthValue {
WTF_MAKE_FAST_ALLOCATED;
public:
// FIXME: Once all SVGLengthValue users use Length internally, we make this a wrapper for Length.
SVGLengthValue(SVGLengthMode = LengthModeOther, const String& valueAsString = String());
SVGLengthValue(const SVGLengthContext&, float, SVGLengthMode = LengthModeOther, SVGLengthType = LengthTypeNumber);
SVGLengthType unitType() const;
SVGLengthMode unitMode() const;
bool operator==(const SVGLengthValue&) const;
bool operator!=(const SVGLengthValue&) const;
static SVGLengthValue construct(SVGLengthMode, const String&, SVGParsingError&, SVGLengthNegativeValuesMode = AllowNegativeLengths);
float value(const SVGLengthContext&) const;
ExceptionOr<float> valueForBindings(const SVGLengthContext&) const;
ExceptionOr<void> setValue(float, const SVGLengthContext&);
ExceptionOr<void> setValue(const SVGLengthContext&, float, SVGLengthMode, SVGLengthType);
float valueInSpecifiedUnits() const { return m_valueInSpecifiedUnits; }
void setValueInSpecifiedUnits(float value) { m_valueInSpecifiedUnits = value; }
float valueAsPercentage() const;
String valueAsString() const;
ExceptionOr<void> setValueAsString(const String&);
ExceptionOr<void> setValueAsString(const String&, SVGLengthMode);
ExceptionOr<void> newValueSpecifiedUnits(unsigned short, float valueInSpecifiedUnits);
ExceptionOr<void> convertToSpecifiedUnits(unsigned short, const SVGLengthContext&);
// Helper functions
bool isRelative() const
{
auto type = unitType();
return type == LengthTypePercentage || type == LengthTypeEMS || type == LengthTypeEXS;
}
bool isZero() const
{
return !m_valueInSpecifiedUnits;
}
static SVGLengthValue fromCSSPrimitiveValue(const CSSPrimitiveValue&);
static Ref<CSSPrimitiveValue> toCSSPrimitiveValue(const SVGLengthValue&);
static SVGLengthMode lengthModeForAnimatedLengthAttribute(const QualifiedName&);
SVGLengthValue blend(const SVGLengthValue& from, float progress) const
{
auto toType = unitType();
auto fromType = from.unitType();
if ((from.isZero() && isZero())
|| fromType == LengthTypeUnknown
|| toType == LengthTypeUnknown
|| (!from.isZero() && fromType != LengthTypePercentage && toType == LengthTypePercentage)
|| (!isZero() && fromType == LengthTypePercentage && toType != LengthTypePercentage)
|| (!from.isZero() && !isZero() && (fromType == LengthTypeEMS || fromType == LengthTypeEXS) && fromType != toType))
return *this;
SVGLengthValue length;
if (fromType == LengthTypePercentage || toType == LengthTypePercentage) {
auto fromPercent = from.valueAsPercentage() * 100;
auto toPercent = valueAsPercentage() * 100;
auto result = length.newValueSpecifiedUnits(LengthTypePercentage, WebCore::blend(fromPercent, toPercent, progress));
if (result.hasException())
return { };
return length;
}
if (fromType == toType || from.isZero() || isZero() || fromType == LengthTypeEMS || fromType == LengthTypeEXS) {
auto fromValue = from.valueInSpecifiedUnits();
auto toValue = valueInSpecifiedUnits();
if (isZero()) {
auto result = length.newValueSpecifiedUnits(fromType, WebCore::blend(fromValue, toValue, progress));
if (result.hasException())
return { };
} else {
auto result = length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue, toValue, progress));
if (result.hasException())
return { };
}
return length;
}
ASSERT(!isRelative());
ASSERT(!from.isRelative());
SVGLengthContext nonRelativeLengthContext(nullptr);
auto fromValueInUserUnits = nonRelativeLengthContext.convertValueToUserUnits(from.valueInSpecifiedUnits(), from.unitMode(), fromType);
if (fromValueInUserUnits.hasException())
return { };
auto fromValue = nonRelativeLengthContext.convertValueFromUserUnits(fromValueInUserUnits.releaseReturnValue(), unitMode(), toType);
if (fromValue.hasException())
return { };
float toValue = valueInSpecifiedUnits();
auto result = length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue.releaseReturnValue(), toValue, progress));
if (result.hasException())
return { };
return length;
}
private:
float m_valueInSpecifiedUnits { 0 };
unsigned m_unit;
};
template<> struct SVGPropertyTraits<SVGLengthValue> {
static SVGLengthValue initialValue() { return { }; }
static String toString(const SVGLengthValue& type) { return type.valueAsString(); }
};
WTF::TextStream& operator<<(WTF::TextStream&, const SVGLengthValue&);
} // namespace WebCore
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