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/*
* Copyright (C) 2012 Google, Inc.
* Copyright (C) 2020, 2021, 2022 Igalia S.L.
* 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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.
*/
#include "config.h"
#include "RenderSVGEllipse.h"
#include "RenderSVGShapeInlines.h"
#include "SVGCircleElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGEllipseElement.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RenderSVGEllipse);
RenderSVGEllipse::RenderSVGEllipse(SVGGraphicsElement& element, RenderStyle&& style)
: RenderSVGShape(Type::SVGEllipse, element, WTFMove(style))
{
}
RenderSVGEllipse::~RenderSVGEllipse() = default;
void RenderSVGEllipse::updateShapeFromElement()
{
// Before creating a new object we need to clear the cached bounding box
// to avoid using garbage.
clearPath();
m_shapeType = ShapeType::Empty;
m_fillBoundingBox = FloatRect();
m_strokeBoundingBox = std::nullopt;
m_approximateStrokeBoundingBox = std::nullopt;
m_center = FloatPoint();
m_radii = FloatSize();
calculateRadiiAndCenter();
// Spec: "A negative value is illegal. A value of zero disables rendering of the element."
if (m_radii.isEmpty())
return;
if (m_radii.width() == m_radii.height())
m_shapeType = ShapeType::Circle;
else
m_shapeType = ShapeType::Ellipse;
if (hasNonScalingStroke()) {
// Fallback to path-based approach if shape has a non-scaling stroke.
m_fillBoundingBox = ensurePath().boundingRect();
return;
}
m_fillBoundingBox = FloatRect(m_center.x() - m_radii.width(), m_center.y() - m_radii.height(), 2 * m_radii.width(), 2 * m_radii.height());
m_strokeBoundingBox = m_fillBoundingBox;
if (style().svgStyle().hasStroke())
m_strokeBoundingBox->inflate(strokeWidth() / 2);
}
void RenderSVGEllipse::calculateRadiiAndCenter()
{
Ref graphicsElement = this->graphicsElement();
SVGLengthContext lengthContext(graphicsElement.ptr());
m_center = FloatPoint(
lengthContext.valueForLength(style().svgStyle().cx(), SVGLengthMode::Width),
lengthContext.valueForLength(style().svgStyle().cy(), SVGLengthMode::Height));
if (is<SVGCircleElement>(graphicsElement)) {
float radius = lengthContext.valueForLength(style().svgStyle().r());
m_radii = FloatSize(radius, radius);
return;
}
ASSERT(is<SVGEllipseElement>(graphicsElement));
Length rx = style().svgStyle().rx();
Length ry = style().svgStyle().ry();
m_radii = FloatSize(
lengthContext.valueForLength(rx.isAuto() ? ry : rx, SVGLengthMode::Width),
lengthContext.valueForLength(ry.isAuto() ? rx : ry, SVGLengthMode::Height));
}
void RenderSVGEllipse::fillShape(GraphicsContext& context) const
{
if (hasPath()) {
RenderSVGShape::fillShape(context);
return;
}
context.fillEllipse(m_fillBoundingBox);
}
void RenderSVGEllipse::strokeShape(GraphicsContext& context) const
{
if (!style().hasVisibleStroke())
return;
if (hasPath()) {
RenderSVGShape::strokeShape(context);
return;
}
context.strokeEllipse(m_fillBoundingBox);
}
bool RenderSVGEllipse::canUseStrokeHitTestFastPath() const
{
// Non-scaling-stroke needs special handling.
if (hasNonScalingStroke())
return false;
// We can compute intersections with continuous strokes on circles
// without using a Path.
return m_shapeType == ShapeType::Circle && style().svgStyle().strokeDashArray().isEmpty();
}
bool RenderSVGEllipse::shapeDependentStrokeContains(const FloatPoint& point, PointCoordinateSpace pointCoordinateSpace)
{
if (m_radii.isEmpty())
return false;
// The optimized code below does not support dash strokes and non-circle shape.
// Thus we fallback to path-based approach in that case.
if (!canUseStrokeHitTestFastPath()) {
ensurePath();
return RenderSVGShape::shapeDependentStrokeContains(point, pointCoordinateSpace);
}
float halfStrokeWidth = strokeWidth() / 2;
FloatPoint centerOffset = FloatPoint(m_center.x() - point.x(), m_center.y() - point.y());
return std::abs(centerOffset.length() - m_radii.width()) <= halfStrokeWidth;
}
bool RenderSVGEllipse::shapeDependentFillContains(const FloatPoint& point, const WindRule) const
{
if (m_radii.isEmpty())
return false;
FloatPoint center = FloatPoint(m_center.x() - point.x(), m_center.y() - point.y());
// This works by checking if the point satisfies the ellipse equation.
// (x/rX)^2 + (y/rY)^2 <= 1
float xrX = center.x() / m_radii.width();
float yrY = center.y() / m_radii.height();
return xrX * xrX + yrY * yrY <= 1.0;
}
bool RenderSVGEllipse::isRenderingDisabled() const
{
// A radius of zero disables rendering of the element, and results in an empty bounding box.
return m_fillBoundingBox.isEmpty();
}
}
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