1/*
2 * Copyright (C) 2012 Google, Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#pragma once
21
22#include "Path.h"
23#include <wtf/Forward.h>
24
25namespace WebCore {
26
27class SVGSubpathData {
28public:
29 SVGSubpathData(Vector<FloatPoint>& zeroLengthSubpathLocations)
30 : m_zeroLengthSubpathLocations(zeroLengthSubpathLocations)
31 {
32 }
33
34 static void updateFromPathElement(SVGSubpathData& subpathFinder, const PathElement& element)
35 {
36 switch (element.type) {
37 case PathElementMoveToPoint:
38 if (subpathFinder.m_pathIsZeroLength && !subpathFinder.m_haveSeenMoveOnly)
39 subpathFinder.m_zeroLengthSubpathLocations.append(subpathFinder.m_lastPoint);
40 subpathFinder.m_lastPoint = subpathFinder.m_movePoint = element.points[0];
41 subpathFinder.m_haveSeenMoveOnly = true;
42 subpathFinder.m_pathIsZeroLength = true;
43 break;
44 case PathElementAddLineToPoint:
45 if (subpathFinder.m_lastPoint != element.points[0]) {
46 subpathFinder.m_pathIsZeroLength = false;
47 subpathFinder.m_lastPoint = element.points[0];
48 }
49 subpathFinder.m_haveSeenMoveOnly = false;
50 break;
51 case PathElementAddQuadCurveToPoint:
52 if (subpathFinder.m_lastPoint != element.points[0] || element.points[0] != element.points[1]) {
53 subpathFinder.m_pathIsZeroLength = false;
54 subpathFinder.m_lastPoint = element.points[1];
55 }
56 subpathFinder.m_haveSeenMoveOnly = false;
57 break;
58 case PathElementAddCurveToPoint:
59 if (subpathFinder.m_lastPoint != element.points[0] || element.points[0] != element.points[1] || element.points[1] != element.points[2]) {
60 subpathFinder.m_pathIsZeroLength = false;
61 subpathFinder.m_lastPoint = element.points[2];
62 }
63 subpathFinder.m_haveSeenMoveOnly = false;
64 break;
65 case PathElementCloseSubpath:
66 if (subpathFinder.m_pathIsZeroLength)
67 subpathFinder.m_zeroLengthSubpathLocations.append(subpathFinder.m_lastPoint);
68 subpathFinder.m_haveSeenMoveOnly = true; // This is an implicit move for the next element
69 subpathFinder.m_pathIsZeroLength = true; // A new sub-path also starts here
70 subpathFinder.m_lastPoint = subpathFinder.m_movePoint;
71 break;
72 }
73 }
74
75 void pathIsDone()
76 {
77 if (m_pathIsZeroLength && !m_haveSeenMoveOnly)
78 m_zeroLengthSubpathLocations.append(m_lastPoint);
79 }
80
81private:
82 Vector<FloatPoint>& m_zeroLengthSubpathLocations;
83 FloatPoint m_lastPoint;
84 FloatPoint m_movePoint;
85 bool m_haveSeenMoveOnly { false };
86 bool m_pathIsZeroLength { false };
87};
88
89} // namespace WebCore
90