1/*
2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above
9 *    copyright notice, this list of conditions and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above
12 *    copyright notice, this list of conditions and the following
13 *    disclaimer in the documentation and/or other materials
14 *    provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
27 * OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef PolygonShape_h
31#define PolygonShape_h
32
33#include "FloatPolygon.h"
34#include "Shape.h"
35#include "ShapeInterval.h"
36
37namespace WebCore {
38
39class OffsetPolygonEdge : public VertexPair {
40public:
41    enum Basis {
42        Edge,
43        Vertex,
44        LineTop
45    };
46
47    OffsetPolygonEdge(const FloatPolygonEdge& edge, const FloatSize& offset)
48        : m_vertex1(edge.vertex1() + offset)
49        , m_vertex2(edge.vertex2() + offset)
50        , m_edgeIndex(edge.edgeIndex())
51        , m_basis(Edge)
52    {
53    }
54
55    OffsetPolygonEdge(const FloatPoint& reflexVertex, const FloatSize& offset1, const FloatSize& offset2)
56        : m_vertex1(reflexVertex + offset1)
57        , m_vertex2(reflexVertex + offset2)
58        , m_edgeIndex(-1)
59        , m_basis(Vertex)
60    {
61    }
62
63    OffsetPolygonEdge(const FloatPolygon& polygon, float minLogicalIntervalTop, const FloatSize& offset)
64        : m_vertex1(FloatPoint(polygon.boundingBox().x(), minLogicalIntervalTop) + offset)
65        , m_vertex2(FloatPoint(polygon.boundingBox().maxX(), minLogicalIntervalTop) + offset)
66        , m_edgeIndex(-1)
67        , m_basis(LineTop)
68    {
69    }
70
71    virtual const FloatPoint& vertex1() const OVERRIDE { return m_vertex1; }
72    virtual const FloatPoint& vertex2() const OVERRIDE { return m_vertex2; }
73    int edgeIndex() const { return m_edgeIndex; }
74    Basis basis() const { return m_basis; }
75
76private:
77    FloatPoint m_vertex1;
78    FloatPoint m_vertex2;
79    int m_edgeIndex;
80    Basis m_basis;
81};
82
83class PolygonShape : public Shape {
84    WTF_MAKE_NONCOPYABLE(PolygonShape);
85public:
86    PolygonShape(PassOwnPtr<Vector<FloatPoint> > vertices, WindRule fillRule)
87        : Shape()
88        , m_polygon(vertices, fillRule)
89        , m_marginBounds(nullptr)
90        , m_paddingBounds(nullptr)
91    {
92    }
93
94    virtual LayoutRect shapeMarginLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapeMarginBounds().boundingBox()); }
95    virtual LayoutRect shapePaddingLogicalBoundingBox() const OVERRIDE { return static_cast<LayoutRect>(shapePaddingBounds().boundingBox()); }
96    virtual bool isEmpty() const OVERRIDE { return m_polygon.isEmpty(); }
97    virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
98    virtual void getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const OVERRIDE;
99    virtual bool firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit&) const OVERRIDE;
100
101private:
102    const FloatPolygon& shapeMarginBounds() const;
103    const FloatPolygon& shapePaddingBounds() const;
104
105    FloatPolygon m_polygon;
106    mutable OwnPtr<FloatPolygon> m_marginBounds;
107    mutable OwnPtr<FloatPolygon> m_paddingBounds;
108};
109
110} // namespace WebCore
111
112#endif // PolygonShape_h
113