1/*
2 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2008 Rob Buis <buis@kde.org>
4 * Copyright (C) 2005, 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.
6 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
7 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
8 * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
9 * Copyright (C) 2011 Renata Hodovan <reni@webkit.org>
10 * Copyright (C) 2011 University of Szeged
11 *
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Library General Public
14 * License as published by the Free Software Foundation; either
15 * version 2 of the License, or (at your option) any later version.
16 *
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Library General Public License for more details.
21 *
22 * You should have received a copy of the GNU Library General Public License
23 * along with this library; see the file COPYING.LIB. If not, write to
24 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
25 * Boston, MA 02110-1301, USA.
26 */
27
28#include "config.h"
29#include "RenderSVGPath.h"
30
31#include "SVGPathElement.h"
32#include "SVGSubpathData.h"
33#include <wtf/IsoMallocInlines.h>
34
35namespace WebCore {
36
37WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGPath);
38
39RenderSVGPath::RenderSVGPath(SVGGraphicsElement& element, RenderStyle&& style)
40 : RenderSVGShape(element, WTFMove(style))
41{
42}
43
44RenderSVGPath::~RenderSVGPath() = default;
45
46void RenderSVGPath::updateShapeFromElement()
47{
48 RenderSVGShape::updateShapeFromElement();
49 updateZeroLengthSubpaths();
50
51 m_strokeBoundingBox = calculateUpdatedStrokeBoundingBox();
52}
53
54FloatRect RenderSVGPath::calculateUpdatedStrokeBoundingBox() const
55{
56 FloatRect strokeBoundingBox = m_strokeBoundingBox;
57
58 if (style().svgStyle().hasStroke()) {
59 // FIXME: zero-length subpaths do not respect vector-effect = non-scaling-stroke.
60 float strokeWidth = this->strokeWidth();
61 for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i)
62 strokeBoundingBox.unite(zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth));
63 }
64
65 return strokeBoundingBox;
66}
67
68static void useStrokeStyleToFill(GraphicsContext& context)
69{
70 if (auto gradient = context.strokeGradient())
71 context.setFillGradient(*gradient);
72 else if (Pattern* pattern = context.strokePattern())
73 context.setFillPattern(*pattern);
74 else
75 context.setFillColor(context.strokeColor());
76}
77
78void RenderSVGPath::strokeShape(GraphicsContext& context) const
79{
80 if (!style().hasVisibleStroke())
81 return;
82
83 RenderSVGShape::strokeShape(context);
84
85 if (m_zeroLengthLinecapLocations.isEmpty())
86 return;
87
88 Path* usePath;
89 AffineTransform nonScalingTransform;
90
91 if (hasNonScalingStroke())
92 nonScalingTransform = nonScalingStrokeTransform();
93
94 GraphicsContextStateSaver stateSaver(context, true);
95 useStrokeStyleToFill(context);
96 for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
97 usePath = zeroLengthLinecapPath(m_zeroLengthLinecapLocations[i]);
98 if (hasNonScalingStroke())
99 usePath = nonScalingStrokePath(usePath, nonScalingTransform);
100 context.fillPath(*usePath);
101 }
102}
103
104bool RenderSVGPath::shapeDependentStrokeContains(const FloatPoint& point, PointCoordinateSpace pointCoordinateSpace)
105{
106 if (RenderSVGShape::shapeDependentStrokeContains(point, pointCoordinateSpace))
107 return true;
108
109 for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
110 ASSERT(style().svgStyle().hasStroke());
111 float strokeWidth = this->strokeWidth();
112 if (style().capStyle() == SquareCap) {
113 if (zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth).contains(point))
114 return true;
115 } else {
116 ASSERT(style().capStyle() == RoundCap);
117 FloatPoint radiusVector(point.x() - m_zeroLengthLinecapLocations[i].x(), point.y() - m_zeroLengthLinecapLocations[i].y());
118 if (radiusVector.lengthSquared() < strokeWidth * strokeWidth * .25f)
119 return true;
120 }
121 }
122 return false;
123}
124
125bool RenderSVGPath::shouldStrokeZeroLengthSubpath() const
126{
127 // Spec(11.4): Any zero length subpath shall not be stroked if the "stroke-linecap" property has a value of butt
128 // but shall be stroked if the "stroke-linecap" property has a value of round or square
129 return style().svgStyle().hasStroke() && style().capStyle() != ButtCap;
130}
131
132Path* RenderSVGPath::zeroLengthLinecapPath(const FloatPoint& linecapPosition) const
133{
134 static NeverDestroyed<Path> tempPath;
135
136 tempPath.get().clear();
137 if (style().capStyle() == SquareCap)
138 tempPath.get().addRect(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
139 else
140 tempPath.get().addEllipse(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
141
142 return &tempPath.get();
143}
144
145FloatRect RenderSVGPath::zeroLengthSubpathRect(const FloatPoint& linecapPosition, float strokeWidth) const
146{
147 return FloatRect(linecapPosition.x() - strokeWidth / 2, linecapPosition.y() - strokeWidth / 2, strokeWidth, strokeWidth);
148}
149
150void RenderSVGPath::updateZeroLengthSubpaths()
151{
152 m_zeroLengthLinecapLocations.clear();
153
154 if (!strokeWidth() || !shouldStrokeZeroLengthSubpath())
155 return;
156
157 SVGSubpathData subpathData(m_zeroLengthLinecapLocations);
158 path().apply([&subpathData](const PathElement& pathElement) {
159 SVGSubpathData::updateFromPathElement(subpathData, pathElement);
160 });
161 subpathData.pathIsDone();
162}
163
164bool RenderSVGPath::isRenderingDisabled() const
165{
166 // For a polygon, polyline or path, rendering is disabled if there is no path data.
167 // No path data is possible in the case of a missing or empty 'd' or 'points' attribute.
168 return path().isEmpty();
169}
170
171}
172