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
30 #include "core/rendering/svg/RenderSVGPath.h"
31
32 #include "core/rendering/svg/SVGSubpathData.h"
33 #include "platform/graphics/GraphicsContextStateSaver.h"
34
35 namespace WebCore {
36
RenderSVGPath(SVGGraphicsElement * node)37 RenderSVGPath::RenderSVGPath(SVGGraphicsElement* node)
38 : RenderSVGShape(node)
39 {
40 }
41
~RenderSVGPath()42 RenderSVGPath::~RenderSVGPath()
43 {
44 }
45
updateShapeFromElement()46 void RenderSVGPath::updateShapeFromElement()
47 {
48 RenderSVGShape::updateShapeFromElement();
49 updateZeroLengthSubpaths();
50
51 m_strokeBoundingBox = calculateUpdatedStrokeBoundingBox();
52 }
53
calculateUpdatedStrokeBoundingBox() const54 FloatRect 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
useStrokeStyleToFill(GraphicsContext * context)68 static void useStrokeStyleToFill(GraphicsContext* context)
69 {
70 if (Gradient* 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
strokeShape(GraphicsContext * context) const78 void RenderSVGPath::strokeShape(GraphicsContext* context) const
79 {
80 if (!style()->svgStyle()->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
shapeDependentStrokeContains(const FloatPoint & point)104 bool RenderSVGPath::shapeDependentStrokeContains(const FloatPoint& point)
105 {
106 if (RenderSVGShape::shapeDependentStrokeContains(point))
107 return true;
108
109 const SVGRenderStyle* svgStyle = style()->svgStyle();
110 for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
111 ASSERT(svgStyle->hasStroke());
112 float strokeWidth = this->strokeWidth();
113 if (svgStyle->capStyle() == SquareCap) {
114 if (zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth).contains(point))
115 return true;
116 } else {
117 ASSERT(svgStyle->capStyle() == RoundCap);
118 FloatPoint radiusVector(point.x() - m_zeroLengthLinecapLocations[i].x(), point.y() - m_zeroLengthLinecapLocations[i].y());
119 if (radiusVector.lengthSquared() < strokeWidth * strokeWidth * .25f)
120 return true;
121 }
122 }
123 return false;
124 }
125
shouldStrokeZeroLengthSubpath() const126 bool RenderSVGPath::shouldStrokeZeroLengthSubpath() const
127 {
128 // Spec(11.4): Any zero length subpath shall not be stroked if the "stroke-linecap" property has a value of butt
129 // but shall be stroked if the "stroke-linecap" property has a value of round or square
130 return style()->svgStyle()->hasStroke() && style()->svgStyle()->capStyle() != ButtCap;
131 }
132
zeroLengthLinecapPath(const FloatPoint & linecapPosition) const133 Path* RenderSVGPath::zeroLengthLinecapPath(const FloatPoint& linecapPosition) const
134 {
135 DEFINE_STATIC_LOCAL(Path, tempPath, ());
136
137 tempPath.clear();
138 if (style()->svgStyle()->capStyle() == SquareCap)
139 tempPath.addRect(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
140 else
141 tempPath.addEllipse(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
142
143 return &tempPath;
144 }
145
zeroLengthSubpathRect(const FloatPoint & linecapPosition,float strokeWidth) const146 FloatRect RenderSVGPath::zeroLengthSubpathRect(const FloatPoint& linecapPosition, float strokeWidth) const
147 {
148 return FloatRect(linecapPosition.x() - strokeWidth / 2, linecapPosition.y() - strokeWidth / 2, strokeWidth, strokeWidth);
149 }
150
updateZeroLengthSubpaths()151 void RenderSVGPath::updateZeroLengthSubpaths()
152 {
153 m_zeroLengthLinecapLocations.clear();
154
155 if (!strokeWidth() || !shouldStrokeZeroLengthSubpath())
156 return;
157
158 SVGSubpathData subpathData(m_zeroLengthLinecapLocations);
159 path().apply(&subpathData, SVGSubpathData::updateFromPathElement);
160 subpathData.pathIsDone();
161 }
162
163 }
164