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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc.
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
* Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
* Copyright (C) 2011 University of Szeged
*
* 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.
*/
#include "config.h"
#if ENABLE(SVG)
#include "RenderSVGPath.h"
#include "SVGGraphicsElement.h"
#include "SVGPathElement.h"
#include "SVGSubpathData.h"
namespace WebCore {
RenderSVGPath::RenderSVGPath(SVGGraphicsElement* node)
: RenderSVGShape(node)
{
}
RenderSVGPath::~RenderSVGPath()
{
}
void RenderSVGPath::updateShapeFromElement()
{
RenderSVGShape::updateShapeFromElement();
updateZeroLengthSubpaths();
m_strokeBoundingBox = calculateUpdatedStrokeBoundingBox();
}
FloatRect RenderSVGPath::calculateUpdatedStrokeBoundingBox() const
{
FloatRect strokeBoundingBox = m_strokeBoundingBox;
if (style()->svgStyle()->hasStroke()) {
// FIXME: zero-length subpaths do not respect vector-effect = non-scaling-stroke.
float strokeWidth = this->strokeWidth();
for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i)
strokeBoundingBox.unite(zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth));
}
return strokeBoundingBox;
}
static void useStrokeStyleToFill(GraphicsContext* context)
{
if (Gradient* gradient = context->strokeGradient())
context->setFillGradient(gradient);
else if (Pattern* pattern = context->strokePattern())
context->setFillPattern(pattern);
else
context->setFillColor(context->strokeColor(), context->strokeColorSpace());
}
void RenderSVGPath::strokeShape(GraphicsContext* context) const
{
if (!style()->svgStyle()->hasVisibleStroke())
return;
RenderSVGShape::strokeShape(context);
if (m_zeroLengthLinecapLocations.isEmpty())
return;
Path* usePath;
AffineTransform nonScalingTransform;
if (hasNonScalingStroke())
nonScalingTransform = nonScalingStrokeTransform();
GraphicsContextStateSaver stateSaver(*context, true);
useStrokeStyleToFill(context);
for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
usePath = zeroLengthLinecapPath(m_zeroLengthLinecapLocations[i]);
if (hasNonScalingStroke())
usePath = nonScalingStrokePath(usePath, nonScalingTransform);
context->fillPath(*usePath);
}
}
bool RenderSVGPath::shapeDependentStrokeContains(const FloatPoint& point)
{
if (RenderSVGShape::shapeDependentStrokeContains(point))
return true;
const SVGRenderStyle* svgStyle = style()->svgStyle();
for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
ASSERT(svgStyle->hasStroke());
float strokeWidth = this->strokeWidth();
if (svgStyle->capStyle() == SquareCap) {
if (zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth).contains(point))
return true;
} else {
ASSERT(svgStyle->capStyle() == RoundCap);
FloatPoint radiusVector(point.x() - m_zeroLengthLinecapLocations[i].x(), point.y() - m_zeroLengthLinecapLocations[i].y());
if (radiusVector.lengthSquared() < strokeWidth * strokeWidth * .25f)
return true;
}
}
return false;
}
bool RenderSVGPath::shouldStrokeZeroLengthSubpath() const
{
// Spec(11.4): Any zero length subpath shall not be stroked if the "stroke-linecap" property has a value of butt
// but shall be stroked if the "stroke-linecap" property has a value of round or square
return style()->svgStyle()->hasStroke() && style()->svgStyle()->capStyle() != ButtCap;
}
Path* RenderSVGPath::zeroLengthLinecapPath(const FloatPoint& linecapPosition) const
{
DEFINE_STATIC_LOCAL(Path, tempPath, ());
tempPath.clear();
if (style()->svgStyle()->capStyle() == SquareCap)
tempPath.addRect(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
else
tempPath.addEllipse(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
return &tempPath;
}
FloatRect RenderSVGPath::zeroLengthSubpathRect(const FloatPoint& linecapPosition, float strokeWidth) const
{
return FloatRect(linecapPosition.x() - strokeWidth / 2, linecapPosition.y() - strokeWidth / 2, strokeWidth, strokeWidth);
}
void RenderSVGPath::updateZeroLengthSubpaths()
{
m_zeroLengthLinecapLocations.clear();
if (!strokeWidth() || !shouldStrokeZeroLengthSubpath())
return;
SVGSubpathData subpathData(m_zeroLengthLinecapLocations);
path().apply(&subpathData, SVGSubpathData::updateFromPathElement);
subpathData.pathIsDone();
}
}
#endif // ENABLE(SVG)
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