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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.
*/
#ifndef SVGLength_h
#define SVGLength_h
#if ENABLE(SVG)
#include "AnimationUtilities.h"
#include "SVGLengthContext.h"
#include "SVGParsingError.h"
#include "SVGPropertyTraits.h"
namespace WebCore {
class CSSPrimitiveValue;
class QualifiedName;
typedef int ExceptionCode;
enum SVGLengthNegativeValuesMode {
AllowNegativeLengths,
ForbidNegativeLengths
};
class SVGLength {
WTF_MAKE_FAST_ALLOCATED;
public:
// Forward declare these enums in the w3c naming scheme, for IDL generation
enum {
SVG_LENGTHTYPE_UNKNOWN = LengthTypeUnknown,
SVG_LENGTHTYPE_NUMBER = LengthTypeNumber,
SVG_LENGTHTYPE_PERCENTAGE = LengthTypePercentage,
SVG_LENGTHTYPE_EMS = LengthTypeEMS,
SVG_LENGTHTYPE_EXS = LengthTypeEXS,
SVG_LENGTHTYPE_PX = LengthTypePX,
SVG_LENGTHTYPE_CM = LengthTypeCM,
SVG_LENGTHTYPE_MM = LengthTypeMM,
SVG_LENGTHTYPE_IN = LengthTypeIN,
SVG_LENGTHTYPE_PT = LengthTypePT,
SVG_LENGTHTYPE_PC = LengthTypePC
};
SVGLength(SVGLengthMode = LengthModeOther, const String& valueAsString = String());
SVGLength(const SVGLengthContext&, float, SVGLengthMode = LengthModeOther, SVGLengthType = LengthTypeNumber);
SVGLength(const SVGLength&);
SVGLengthType unitType() const;
SVGLengthMode unitMode() const;
bool operator==(const SVGLength&) const;
bool operator!=(const SVGLength&) const;
static SVGLength construct(SVGLengthMode, const String&, SVGParsingError&, SVGLengthNegativeValuesMode = AllowNegativeLengths);
float value(const SVGLengthContext&) const;
float value(const SVGLengthContext&, ExceptionCode&) const;
void setValue(float, const SVGLengthContext&, ExceptionCode&);
void setValue(const SVGLengthContext&, float, SVGLengthMode, SVGLengthType, ExceptionCode&);
float valueInSpecifiedUnits() const { return m_valueInSpecifiedUnits; }
void setValueInSpecifiedUnits(float value) { m_valueInSpecifiedUnits = value; }
float valueAsPercentage() const;
String valueAsString() const;
void setValueAsString(const String&, ExceptionCode&);
void setValueAsString(const String&, SVGLengthMode, ExceptionCode&);
void newValueSpecifiedUnits(unsigned short, float valueInSpecifiedUnits, ExceptionCode&);
void convertToSpecifiedUnits(unsigned short, const SVGLengthContext&, ExceptionCode&);
// Helper functions
inline bool isRelative() const
{
SVGLengthType type = unitType();
return type == LengthTypePercentage || type == LengthTypeEMS || type == LengthTypeEXS;
}
bool isZero() const
{
return !m_valueInSpecifiedUnits;
}
static SVGLength fromCSSPrimitiveValue(CSSPrimitiveValue*);
static PassRefPtr<CSSPrimitiveValue> toCSSPrimitiveValue(const SVGLength&);
static SVGLengthMode lengthModeForAnimatedLengthAttribute(const QualifiedName&);
SVGLength blend(const SVGLength& from, float progress) const
{
SVGLengthType toType = unitType();
SVGLengthType 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;
SVGLength length;
ExceptionCode ec = 0;
if (fromType == LengthTypePercentage || toType == LengthTypePercentage) {
float fromPercent = from.valueAsPercentage() * 100;
float toPercent = valueAsPercentage() * 100;
length.newValueSpecifiedUnits(LengthTypePercentage, WebCore::blend(fromPercent, toPercent, progress), ec);
if (ec)
return SVGLength();
return length;
}
if (fromType == toType || from.isZero() || isZero() || fromType == LengthTypeEMS || fromType == LengthTypeEXS) {
float fromValue = from.valueInSpecifiedUnits();
float toValue = valueInSpecifiedUnits();
if (isZero())
length.newValueSpecifiedUnits(fromType, WebCore::blend(fromValue, toValue, progress), ec);
else
length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue, toValue, progress), ec);
if (ec)
return SVGLength();
return length;
}
ASSERT(!isRelative());
ASSERT(!from.isRelative());
SVGLengthContext nonRelativeLengthContext(0);
float fromValueInUserUnits = nonRelativeLengthContext.convertValueToUserUnits(from.valueInSpecifiedUnits(), from.unitMode(), fromType, ec);
if (ec)
return SVGLength();
float fromValue = nonRelativeLengthContext.convertValueFromUserUnits(fromValueInUserUnits, unitMode(), toType, ec);
if (ec)
return SVGLength();
float toValue = valueInSpecifiedUnits();
length.newValueSpecifiedUnits(toType, WebCore::blend(fromValue, toValue, progress), ec);
if (ec)
return SVGLength();
return length;
}
private:
float m_valueInSpecifiedUnits;
unsigned int m_unit;
};
template<>
struct SVGPropertyTraits<SVGLength> {
static SVGLength initialValue() { return SVGLength(); }
static String toString(const SVGLength& type) { return type.valueAsString(); }
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif // SVGLength_h
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