1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* 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
* Copyright (C) 2020, 2021, 2022 Igalia S.L.
*
* 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 "RenderSVGPath.h"
#if ENABLE(LAYER_BASED_SVG_ENGINE)
#include "Gradient.h"
#include "RenderSVGShapeInlines.h"
#include "RenderStyleInlines.h"
#include "SVGPathElement.h"
#include "SVGSubpathData.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderSVGPath);
RenderSVGPath::RenderSVGPath(SVGGraphicsElement& element, RenderStyle&& style)
: RenderSVGShape(element, WTFMove(style))
{
}
RenderSVGPath::~RenderSVGPath() = default;
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 (auto gradient = context.strokeGradient())
context.setFillGradient(*gradient, context.strokeGradientSpaceTransform());
else if (Pattern* pattern = context.strokePattern())
context.setFillPattern(*pattern);
else
context.setFillColor(context.strokeColor());
}
void RenderSVGPath::strokeShape(GraphicsContext& context) const
{
if (!style().hasVisibleStroke())
return;
// This happens only if the layout was never been called for this element.
if (!hasPath())
return;
RenderSVGShape::strokeShape(context);
strokeZeroLengthSubpaths(context);
}
bool RenderSVGPath::shapeDependentStrokeContains(const FloatPoint& point, PointCoordinateSpace pointCoordinateSpace)
{
if (RenderSVGShape::shapeDependentStrokeContains(point, pointCoordinateSpace))
return true;
for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
ASSERT(style().svgStyle().hasStroke());
float strokeWidth = this->strokeWidth();
if (style().capStyle() == LineCap::Square) {
if (zeroLengthSubpathRect(m_zeroLengthLinecapLocations[i], strokeWidth).contains(point))
return true;
} else {
ASSERT(style().capStyle() == LineCap::Round);
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().capStyle() != LineCap::Butt;
}
Path* RenderSVGPath::zeroLengthLinecapPath(const FloatPoint& linecapPosition) const
{
static NeverDestroyed<Path> tempPath;
tempPath.get().clear();
if (style().capStyle() == LineCap::Square)
tempPath.get().addRect(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
else
tempPath.get().addEllipseInRect(zeroLengthSubpathRect(linecapPosition, this->strokeWidth()));
return &tempPath.get();
}
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().applyElements([&subpathData](const PathElement& pathElement) {
SVGSubpathData::updateFromPathElement(subpathData, pathElement);
});
subpathData.pathIsDone();
}
void RenderSVGPath::strokeZeroLengthSubpaths(GraphicsContext& context) const
{
if (m_zeroLengthLinecapLocations.isEmpty())
return;
AffineTransform nonScalingTransform;
if (hasNonScalingStroke())
nonScalingTransform = nonScalingStrokeTransform();
GraphicsContextStateSaver stateSaver(context, true);
useStrokeStyleToFill(context);
for (size_t i = 0; i < m_zeroLengthLinecapLocations.size(); ++i) {
auto usePath = zeroLengthLinecapPath(m_zeroLengthLinecapLocations[i]);
if (hasNonScalingStroke())
usePath = nonScalingStrokePath(usePath, nonScalingTransform);
context.fillPath(*usePath);
}
}
bool RenderSVGPath::isRenderingDisabled() const
{
// For a polygon, polyline or path, rendering is disabled if there is no path data.
// No path data is possible in the case of a missing or empty 'd' or 'points' attribute.
return !hasPath() || path().isEmpty();
}
}
#endif // ENABLE(LAYER_BASED_SVG_ENGINE)
|
