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/*
* Copyright (C) 2012 Google, Inc.
* 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 "SVGCircleElement.h"
#include "SVGEllipseElement.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGEllipse);
RenderSVGEllipse::RenderSVGEllipse(SVGGraphicsElement& element, RenderStyle&& style)
: RenderSVGShape(element, WTFMove(style))
, m_usePathFallback(false)
{
}
RenderSVGEllipse::~RenderSVGEllipse() = default;
void RenderSVGEllipse::updateShapeFromElement()
{
// Before creating a new object we need to clear the cached bounding box
// to avoid using garbage.
m_fillBoundingBox = FloatRect();
m_strokeBoundingBox = FloatRect();
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 (hasNonScalingStroke()) {
// Fallback to RenderSVGShape if shape has a non-scaling stroke.
RenderSVGShape::updateShapeFromElement();
m_usePathFallback = true;
return;
}
m_usePathFallback = false;
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()
{
SVGLengthContext lengthContext(&graphicsElement());
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 (m_usePathFallback) {
RenderSVGShape::fillShape(context);
return;
}
context.fillEllipse(m_fillBoundingBox);
}
void RenderSVGEllipse::strokeShape(GraphicsContext& context) const
{
if (!style().hasVisibleStroke())
return;
if (m_usePathFallback) {
RenderSVGShape::strokeShape(context);
return;
}
context.strokeEllipse(m_fillBoundingBox);
}
bool RenderSVGEllipse::shapeDependentStrokeContains(const FloatPoint& point, PointCoordinateSpace pointCoordinateSpace)
{
// The optimized contains code below does not support non-smooth strokes so we need
// to fall back to RenderSVGShape::shapeDependentStrokeContains in these cases.
if (m_usePathFallback || !hasSmoothStroke()) {
if (!hasPath())
RenderSVGShape::updateShapeFromElement();
return RenderSVGShape::shapeDependentStrokeContains(point, pointCoordinateSpace);
}
float halfStrokeWidth = strokeWidth() / 2;
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, for the outer but not the inner stroke.
float xrXOuter = center.x() / (m_radii.width() + halfStrokeWidth);
float yrYOuter = center.y() / (m_radii.height() + halfStrokeWidth);
if (xrXOuter * xrXOuter + yrYOuter * yrYOuter > 1.0)
return false;
float xrXInner = center.x() / (m_radii.width() - halfStrokeWidth);
float yrYInner = center.y() / (m_radii.height() - halfStrokeWidth);
return xrXInner * xrXInner + yrYInner * yrYInner >= 1.0;
}
bool RenderSVGEllipse::shapeDependentFillContains(const FloatPoint& point, const WindRule fillRule) const
{
if (m_usePathFallback)
return RenderSVGShape::shapeDependentFillContains(point, fillRule);
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();
}
}