1/*
2 * Copyright (C) 2006, 2007 Eric Seidel <eric@webkit.org>
3 * Copyright (C) 2015 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef PathTraversalState_h
28#define PathTraversalState_h
29
30#include "FloatPoint.h"
31#include "Path.h"
32
33namespace WebCore {
34
35class PathTraversalState {
36public:
37 enum class Action {
38 TotalLength,
39 VectorAtLength,
40 SegmentAtLength,
41 };
42
43 PathTraversalState(Action, float desiredLength = 0);
44
45public:
46 bool processPathElement(PathElementType, const FloatPoint*);
47 bool processPathElement(const PathElement& element) { return processPathElement(element.type, element.points); }
48
49 Action action() const { return m_action; }
50 void setAction(Action action) { m_action = action; }
51 float desiredLength() const { return m_desiredLength; }
52 void setDesiredLength(float desiredLength) { m_desiredLength = desiredLength; }
53
54 // Traversing output -- should be read only
55 bool success() const { return m_success; }
56 float totalLength() const { return m_totalLength; }
57 FloatPoint current() const { return m_current; }
58 float normalAngle() const { return m_normalAngle; }
59
60private:
61 void closeSubpath();
62 void moveTo(const FloatPoint&);
63 void lineTo(const FloatPoint&);
64 void quadraticBezierTo(const FloatPoint&, const FloatPoint&);
65 void cubicBezierTo(const FloatPoint&, const FloatPoint&, const FloatPoint&);
66
67 bool finalizeAppendPathElement();
68 bool appendPathElement(PathElementType, const FloatPoint*);
69
70private:
71 Action m_action;
72 bool m_success { false };
73
74 FloatPoint m_current;
75 FloatPoint m_start;
76
77 float m_totalLength { 0 };
78 float m_desiredLength { 0 };
79
80 // For normal calculations
81 FloatPoint m_previous;
82 float m_normalAngle { 0 }; // degrees
83 bool m_isZeroVector { false };
84};
85}
86
87#endif
88