SVGLengthContext.h [plain text]
#pragma once
#include "ExceptionOr.h"
#include "FloatRect.h"
#include "SVGUnitTypes.h"
namespace WebCore {
class SVGElement;
class SVGLengthValue;
struct Length;
enum SVGLengthType {
LengthTypeUnknown = 0,
LengthTypeNumber,
LengthTypePercentage,
LengthTypeEMS,
LengthTypeEXS,
LengthTypePX,
LengthTypeCM,
LengthTypeMM,
LengthTypeIN,
LengthTypePT,
LengthTypePC
};
enum SVGLengthMode {
LengthModeWidth = 0,
LengthModeHeight,
LengthModeOther
};
class SVGLengthContext {
public:
explicit SVGLengthContext(const SVGElement*);
template<typename T>
static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
{
return SVGLengthContext::resolveRectangle(context, type, viewport, context->x(), context->y(), context->width(), context->height());
}
static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLengthValue& x, const SVGLengthValue& y, const SVGLengthValue& width, const SVGLengthValue& height);
static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLengthValue& x, const SVGLengthValue& y);
static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLengthValue&);
float valueForLength(const Length&, SVGLengthMode = LengthModeOther);
ExceptionOr<float> convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit) const;
ExceptionOr<float> convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit) const;
bool determineViewport(FloatSize&) const;
private:
SVGLengthContext(const SVGElement*, const FloatRect& viewport);
ExceptionOr<float> convertValueFromUserUnitsToPercentage(float value, SVGLengthMode) const;
ExceptionOr<float> convertValueFromPercentageToUserUnits(float value, SVGLengthMode) const;
ExceptionOr<float> convertValueFromUserUnitsToEMS(float value) const;
ExceptionOr<float> convertValueFromEMSToUserUnits(float value) const;
ExceptionOr<float> convertValueFromUserUnitsToEXS(float value) const;
ExceptionOr<float> convertValueFromEXSToUserUnits(float value) const;
const SVGElement* m_context;
FloatRect m_overridenViewport;
};
}