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/*
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* 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"
#include "SVGPathData.h"
#include "NodeName.h"
#include "Path.h"
#include "RenderElement.h"
#include "RenderStyle.h"
#include "SVGCircleElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGEllipseElement.h"
#include "SVGLengthContext.h"
#include "SVGLineElement.h"
#include "SVGNames.h"
#include "SVGPathElement.h"
#include "SVGPathUtilities.h"
#include "SVGPoint.h"
#include "SVGPointList.h"
#include "SVGPolygonElement.h"
#include "SVGPolylineElement.h"
#include "SVGRectElement.h"
#include "SVGRenderStyle.h"
#include "SVGUseElement.h"
#include <wtf/HashMap.h>
namespace WebCore {
static Path pathFromCircleElement(const SVGCircleElement& element)
{
RenderElement* renderer = element.renderer();
if (!renderer)
return { };
Path path;
auto& style = renderer->style();
SVGLengthContext lengthContext(&element);
float r = lengthContext.valueForLength(style.svgStyle().r());
if (r > 0) {
float cx = lengthContext.valueForLength(style.svgStyle().cx(), SVGLengthMode::Width);
float cy = lengthContext.valueForLength(style.svgStyle().cy(), SVGLengthMode::Height);
path.addEllipseInRect(FloatRect(cx - r, cy - r, r * 2, r * 2));
}
return path;
}
static Path pathFromEllipseElement(const SVGEllipseElement& element)
{
RenderElement* renderer = element.renderer();
if (!renderer)
return { };
auto& style = renderer->style();
SVGLengthContext lengthContext(&element);
float rx = lengthContext.valueForLength(style.svgStyle().rx(), SVGLengthMode::Width);
if (rx <= 0)
return { };
float ry = lengthContext.valueForLength(style.svgStyle().ry(), SVGLengthMode::Height);
if (ry <= 0)
return { };
Path path;
float cx = lengthContext.valueForLength(style.svgStyle().cx(), SVGLengthMode::Width);
float cy = lengthContext.valueForLength(style.svgStyle().cy(), SVGLengthMode::Height);
path.addEllipseInRect(FloatRect(cx - rx, cy - ry, rx * 2, ry * 2));
return path;
}
static Path pathFromLineElement(const SVGLineElement& element)
{
Path path;
SVGLengthContext lengthContext(&element);
path.moveTo(FloatPoint(element.x1().value(lengthContext), element.y1().value(lengthContext)));
path.addLineTo(FloatPoint(element.x2().value(lengthContext), element.y2().value(lengthContext)));
return path;
}
static Path pathFromPathElement(const SVGPathElement& element)
{
return element.path();
}
static Path pathFromPolygonElement(const SVGPolygonElement& element)
{
auto& points = element.points().items();
if (points.isEmpty())
return { };
Path path;
path.moveTo(points.first()->value());
unsigned size = points.size();
for (unsigned i = 1; i < size; ++i)
path.addLineTo(points.at(i)->value());
path.closeSubpath();
return path;
}
static Path pathFromPolylineElement(const SVGPolylineElement& element)
{
auto& points = element.points().items();
if (points.isEmpty())
return { };
Path path;
path.moveTo(points.first()->value());
unsigned size = points.size();
for (unsigned i = 1; i < size; ++i)
path.addLineTo(points.at(i)->value());
return path;
}
static Path pathFromRectElement(const SVGRectElement& element)
{
RenderElement* renderer = element.renderer();
if (!renderer)
return { };
auto& style = renderer->style();
SVGLengthContext lengthContext(&element);
auto size = FloatSize {
lengthContext.valueForLength(style.width(), SVGLengthMode::Width),
lengthContext.valueForLength(style.height(), SVGLengthMode::Height)
};
if (size.isEmpty())
return { };
auto location = FloatPoint {
lengthContext.valueForLength(style.svgStyle().x(), SVGLengthMode::Width),
lengthContext.valueForLength(style.svgStyle().y(), SVGLengthMode::Height)
};
auto radii = FloatSize {
lengthContext.valueForLength(style.svgStyle().rx(), SVGLengthMode::Width),
lengthContext.valueForLength(style.svgStyle().ry(), SVGLengthMode::Height)
};
// Per SVG spec: if one of radii.x() and radii.y() is auto or negative, then the other corner
// radius value is used. If both are auto or negative, then they are both set to 0.
if (style.svgStyle().rx().isAuto() || radii.width() < 0)
radii.setWidth(std::max(0.f, radii.height()));
if (style.svgStyle().ry().isAuto() || radii.height() < 0)
radii.setHeight(std::max(0.f, radii.width()));
Path path;
if (radii.width() <= 0 && radii.height() <= 0) {
path.addRect({ location, size });
return path;
}
// The used values of ‘rx’ and 'ry' for a ‘rect’ are never more than 50% of the used
// value of width for the same shape.
radii.constrainedBetween(radii, size / 2);
// FIXME: We currently enforce using beziers here, as at least on CoreGraphics/Lion, as
// the native method uses a different line dash origin, causing svg/custom/dashOrigin.svg to fail.
// See bug https://bugs.webkit.org/show_bug.cgi?id=79932 which tracks this issue.
path.addRoundedRect(FloatRect { location, size }, radii, PathRoundedRect::Strategy::PreferBezier);
return path;
}
static Path pathFromUseElement(const SVGUseElement& element)
{
RefPtr clipChildElement = element.clipChild();
if (!clipChildElement)
return { };
SVGLengthContext lengthContext(&element);
auto x = element.x().value(lengthContext);
auto y = element.y().value(lengthContext);
auto path = pathFromGraphicsElement(*clipChildElement.get());
if (x || y)
path.translate(FloatSize(x, y));
return path;
}
Path pathFromGraphicsElement(const SVGElement& element)
{
switch (element.tagQName().nodeName()) {
case ElementNames::SVG::circle:
return pathFromCircleElement(uncheckedDowncast<SVGCircleElement>(element));
case ElementNames::SVG::ellipse:
return pathFromEllipseElement(uncheckedDowncast<SVGEllipseElement>(element));
case ElementNames::SVG::line:
return pathFromLineElement(uncheckedDowncast<SVGLineElement>(element));
case ElementNames::SVG::path:
return pathFromPathElement(uncheckedDowncast<SVGPathElement>(element));
case ElementNames::SVG::polygon:
return pathFromPolygonElement(uncheckedDowncast<SVGPolygonElement>(element));
case ElementNames::SVG::polyline:
return pathFromPolylineElement(uncheckedDowncast<SVGPolylineElement>(element));
case ElementNames::SVG::rect:
return pathFromRectElement(uncheckedDowncast<SVGRectElement>(element));
case ElementNames::SVG::use:
return pathFromUseElement(uncheckedDowncast<SVGUseElement>(element));
default:
break;
}
return { };
}
} // namespace WebCore
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