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
|
/*
* Copyright (C) Research In Motion Limited 2010. 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.
*/
#ifndef SVGMarkerData_h
#define SVGMarkerData_h
#if ENABLE(SVG)
#include "FloatConversion.h"
#include "Path.h"
#include <wtf/MathExtras.h>
namespace WebCore {
class RenderSVGResourceMarker;
enum SVGMarkerType {
StartMarker,
MidMarker,
EndMarker
};
struct MarkerPosition {
MarkerPosition(SVGMarkerType useType, const FloatPoint& useOrigin, float useAngle)
: type(useType)
, origin(useOrigin)
, angle(useAngle)
{
}
SVGMarkerType type;
FloatPoint origin;
float angle;
};
class SVGMarkerData {
public:
SVGMarkerData(Vector<MarkerPosition>& positions)
: m_positions(positions)
, m_elementIndex(0)
{
}
static void updateFromPathElement(void* info, const PathElement* element)
{
SVGMarkerData* markerData = static_cast<SVGMarkerData*>(info);
// First update the outslope for the previous element.
markerData->updateOutslope(element->points[0]);
// Record the marker for the previous element.
if (markerData->m_elementIndex > 0) {
SVGMarkerType markerType = markerData->m_elementIndex == 1 ? StartMarker : MidMarker;
markerData->m_positions.append(MarkerPosition(markerType, markerData->m_origin, markerData->currentAngle(markerType)));
}
// Update our marker data for this element.
markerData->updateMarkerDataForPathElement(element);
++markerData->m_elementIndex;
}
void pathIsDone()
{
m_positions.append(MarkerPosition(EndMarker, m_origin, currentAngle(EndMarker)));
}
private:
float currentAngle(SVGMarkerType type) const
{
// For details of this calculation, see: http://www.w3.org/TR/SVG/single-page.html#painting-MarkerElement
FloatPoint inSlope(m_inslopePoints[1] - m_inslopePoints[0]);
FloatPoint outSlope(m_outslopePoints[1] - m_outslopePoints[0]);
double inAngle = rad2deg(inSlope.slopeAngleRadians());
double outAngle = rad2deg(outSlope.slopeAngleRadians());
switch (type) {
case StartMarker:
return narrowPrecisionToFloat(outAngle);
case MidMarker:
// WK193015: Prevent bugs due to angles being non-continuous.
if (fabs(inAngle - outAngle) > 180)
inAngle += 360;
return narrowPrecisionToFloat((inAngle + outAngle) / 2);
case EndMarker:
return narrowPrecisionToFloat(inAngle);
}
ASSERT_NOT_REACHED();
return 0;
}
void updateOutslope(const FloatPoint& point)
{
m_outslopePoints[0] = m_origin;
m_outslopePoints[1] = point;
}
void updateMarkerDataForPathElement(const PathElement* element)
{
FloatPoint* points = element->points;
switch (element->type) {
case PathElementAddQuadCurveToPoint:
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=33115 (PathElementAddQuadCurveToPoint not handled for <marker>)
m_origin = points[1];
break;
case PathElementAddCurveToPoint:
m_inslopePoints[0] = points[1];
m_inslopePoints[1] = points[2];
m_origin = points[2];
break;
case PathElementMoveToPoint:
m_subpathStart = points[0];
case PathElementAddLineToPoint:
updateInslope(points[0]);
m_origin = points[0];
break;
case PathElementCloseSubpath:
updateInslope(points[0]);
m_origin = m_subpathStart;
m_subpathStart = FloatPoint();
}
}
void updateInslope(const FloatPoint& point)
{
m_inslopePoints[0] = m_origin;
m_inslopePoints[1] = point;
}
Vector<MarkerPosition>& m_positions;
unsigned m_elementIndex;
FloatPoint m_origin;
FloatPoint m_subpathStart;
FloatPoint m_inslopePoints[2];
FloatPoint m_outslopePoints[2];
};
}
#endif // ENABLE(SVG)
#endif // SVGMarkerData_h
|
