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/*
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* Copyright (C) 2019-2025 Apple Inc. All rights reserved.
*
* 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 <WebCore/FloatRect.h>
#include <WebCore/SVGLengthValue.h>
#include <WebCore/SVGUnitTypes.h>
namespace WebCore {
class CSSToLengthConversionData;
class SVGElement;
class WeakPtrImplWithEventTargetData;
template<typename> class ExceptionOr;
namespace Style {
struct PreferredSize;
struct SVGCenterCoordinateComponent;
struct SVGCoordinateComponent;
struct SVGRadius;
struct SVGRadiusComponent;
struct SVGStrokeDasharrayValue;
struct SVGStrokeDashoffset;
struct StrokeWidth;
struct ZoomFactor;
struct ZoomNeeded;
}
class SVGLengthContext {
public:
explicit SVGLengthContext(const SVGElement*, const std::optional<FloatSize>& viewportSize = std::nullopt);
~SVGLengthContext();
template<typename T>
static FloatRect resolveRectangle(const SVGElement* context, T& element, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
{
return resolveRectangle(context, type, viewport, element.x(), element.y(), element.width(), element.height());
}
template<typename T>
static FloatRect resolveRectangle(const T& element, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
{
return resolveRectangle(&element, element, type, viewport);
}
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 Style::PreferredSize&, Style::ZoomFactor usedZoom, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGCenterCoordinateComponent&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGCoordinateComponent&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGRadius&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGRadiusComponent&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGStrokeDasharrayValue&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::SVGStrokeDashoffset&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
float valueForLength(const Style::StrokeWidth&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
ExceptionOr<float> resolveValueToUserUnits(float, const CSS::LengthPercentageUnit&, SVGLengthMode) const;
ExceptionOr<CSS::LengthPercentage<>> resolveValueFromUserUnits(float, const CSS::LengthPercentageUnit&, SVGLengthMode) const;
std::optional<FloatSize> viewportSize() const;
private:
ExceptionOr<float> convertValueFromUserUnitsToPercentage(float value, SVGLengthMode) const;
ExceptionOr<float> convertValueFromPercentageToUserUnits(float value, SVGLengthMode) const;
static float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, FloatSize);
ExceptionOr<float> convertValueFromUserUnitsToEXS(float) const;
ExceptionOr<float> convertValueFromEXSToUserUnits(float) const;
std::optional<FloatSize> computeViewportSize() const;
float computeNonCalcLength(float, CSS::LengthUnit) const;
float removeZoomFromFontOrRootFontRelativeLength(float value, CSS::LengthUnit) const;
std::optional<CSSToLengthConversionData> cssConversionData() const;
RefPtr<const SVGElement> protectedContext() const;
template<typename SizeType> float valueForSizeType(const SizeType&, Style::ZoomFactor usedZoom, SVGLengthMode = SVGLengthMode::Other) requires (SizeType::Fixed::zoomOptions == CSS::RangeZoomOptions::Unzoomed || SizeType::Calc::range.zoomOptions == CSS::RangeZoomOptions::Unzoomed);
template<typename SizeType> float valueForSizeType(const SizeType&, Style::ZoomNeeded, SVGLengthMode = SVGLengthMode::Other);
WeakPtr<const SVGElement, WeakPtrImplWithEventTargetData> m_context;
mutable std::optional<FloatSize> m_viewportSize;
};
} // namespace WebCore
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