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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 "core/rendering/svg/RenderSVGEllipse.h"
#include "SVGNames.h"
#include "core/svg/SVGCircleElement.h"
#include "core/svg/SVGEllipseElement.h"
namespace WebCore {
RenderSVGEllipse::RenderSVGEllipse(SVGGraphicsElement* node)
: RenderSVGShape(node)
, m_usePathFallback(false)
{
}
RenderSVGEllipse::~RenderSVGEllipse()
{
}
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();
// Fallback to RenderSVGShape if shape has a non-scaling stroke.
if (hasNonScalingStroke()) {
RenderSVGShape::updateShapeFromElement();
m_usePathFallback = true;
return;
} else
m_usePathFallback = false;
calculateRadiiAndCenter();
// Spec: "A value of zero disables rendering of the element."
if (m_radii.width() <= 0 || m_radii.height() <= 0)
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()
{
ASSERT(element());
if (element()->hasTagName(SVGNames::circleTag)) {
SVGCircleElement* circle = toSVGCircleElement(element());
SVGLengthContext lengthContext(circle);
float radius = circle->rCurrentValue().value(lengthContext);
m_radii = FloatSize(radius, radius);
m_center = FloatPoint(circle->cxCurrentValue().value(lengthContext), circle->cyCurrentValue().value(lengthContext));
return;
}
SVGEllipseElement* ellipse = toSVGEllipseElement(element());
SVGLengthContext lengthContext(ellipse);
m_radii = FloatSize(ellipse->rxCurrentValue().value(lengthContext), ellipse->ryCurrentValue().value(lengthContext));
m_center = FloatPoint(ellipse->cxCurrentValue().value(lengthContext), ellipse->cyCurrentValue().value(lengthContext));
}
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()->svgStyle()->hasVisibleStroke())
return;
if (m_usePathFallback) {
RenderSVGShape::strokeShape(context);
return;
}
context->strokeEllipse(m_fillBoundingBox);
}
bool RenderSVGEllipse::shapeDependentStrokeContains(const FloatPoint& point)
{
// 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);
}
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;
}
}
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