163 lines
5.9 KiB
C++
163 lines
5.9 KiB
C++
/*
|
|
* 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();
|
|
}
|
|
|
|
}
|