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#ifndef SVGSubpathData_h
21#define SVGSubpathData_h
22
23#include "Path.h"
24#include <wtf/Vector.h>
25
26namespace WebCore {
27
28class SVGSubpathData {
29public:
30    SVGSubpathData(Vector<FloatPoint>& zeroLengthSubpathLocations)
31        : m_zeroLengthSubpathLocations(zeroLengthSubpathLocations)
32        , m_haveSeenMoveOnly(true)
33        , m_pathIsZeroLength(true)
34    {
35        m_lastPoint.set(0, 0);
36        m_movePoint.set(0, 0);
37    }
38
39    static void updateFromPathElement(void* info, const PathElement* element)
40    {
41        SVGSubpathData* subpathFinder = static_cast<SVGSubpathData*>(info);
42        switch (element->type) {
43        case PathElementMoveToPoint:
44            if (subpathFinder->m_pathIsZeroLength && !subpathFinder->m_haveSeenMoveOnly)
45                subpathFinder->m_zeroLengthSubpathLocations.append(subpathFinder->m_lastPoint);
46            subpathFinder->m_lastPoint = subpathFinder->m_movePoint = element->points[0];
47            subpathFinder->m_haveSeenMoveOnly = true;
48            subpathFinder->m_pathIsZeroLength = true;
49            break;
50        case PathElementAddLineToPoint:
51            if (subpathFinder->m_lastPoint != element->points[0]) {
52                subpathFinder->m_pathIsZeroLength = false;
53                subpathFinder->m_lastPoint = element->points[0];
54            }
55            subpathFinder->m_haveSeenMoveOnly = false;
56            break;
57        case PathElementAddQuadCurveToPoint:
58            if (subpathFinder->m_lastPoint != element->points[0] || element->points[0] != element->points[1]) {
59                subpathFinder->m_pathIsZeroLength = false;
60                subpathFinder->m_lastPoint = element->points[1];
61            }
62            subpathFinder->m_haveSeenMoveOnly = false;
63            break;
64        case PathElementAddCurveToPoint:
65            if (subpathFinder->m_lastPoint != element->points[0] || element->points[0] != element->points[1] || element->points[1] != element->points[2]) {
66                subpathFinder->m_pathIsZeroLength = false;
67                subpathFinder->m_lastPoint = element->points[2];
68            }
69            subpathFinder->m_haveSeenMoveOnly = false;
70            break;
71        case PathElementCloseSubpath:
72            if (subpathFinder->m_pathIsZeroLength)
73                subpathFinder->m_zeroLengthSubpathLocations.append(subpathFinder->m_lastPoint);
74            subpathFinder->m_haveSeenMoveOnly = true; // This is an implicit move for the next element
75            subpathFinder->m_pathIsZeroLength = true; // A new sub-path also starts here
76            subpathFinder->m_lastPoint = subpathFinder->m_movePoint;
77            break;
78        }
79    }
80
81    void pathIsDone()
82    {
83        if (m_pathIsZeroLength && !m_haveSeenMoveOnly)
84            m_zeroLengthSubpathLocations.append(m_lastPoint);
85    }
86
87private:
88    Vector<FloatPoint>& m_zeroLengthSubpathLocations;
89    FloatPoint m_lastPoint;
90    FloatPoint m_movePoint;
91    bool m_haveSeenMoveOnly;
92    bool m_pathIsZeroLength;
93};
94
95}
96
97#endif // SVGSubpathData_h
98
99