1/*
2 * Copyright (C) 2013 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 HOLDER “AS IS” AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef FloatBoxExtent_h
31#define FloatBoxExtent_h
32
33#include "platform/geometry/FloatRect.h"
34
35namespace WebCore {
36
37class FloatBoxExtent {
38public:
39    FloatBoxExtent()
40        : m_top(0)
41        , m_right(0)
42        , m_bottom(0)
43        , m_left(0)
44    {
45    }
46
47    FloatBoxExtent(float top, float right, float bottom, float left)
48        : m_top(top)
49        , m_right(right)
50        , m_bottom(bottom)
51        , m_left(left)
52    {
53    }
54
55    float top() const { return m_top; }
56    void setTop(float top) { m_top = top; }
57
58    float right() const { return m_right; }
59    void setRight(float right) { m_right = right; }
60
61    float bottom() const { return m_bottom; }
62    void setBottom(float bottom) { m_bottom = bottom; }
63
64    float left() const { return m_left; }
65    void setLeft(float left) { m_left = left; }
66
67    bool isZero() const { return !left() && !right() && !top() && !bottom(); }
68
69    void expandRect(FloatRect& rect) const
70    {
71        if (isZero())
72            return;
73
74        rect.move(-left(), -top());
75        rect.expand(left() + right(), top() + bottom());
76    }
77
78    void unite(const FloatBoxExtent& other)
79    {
80        m_top = std::min(m_top, other.top());
81        m_right = std::max(m_right, other.right());
82        m_bottom = std::max(m_bottom, other.bottom());
83        m_left = std::min(m_left, other.left());
84    }
85
86    void unite(const FloatRect& rect)
87    {
88        m_top = std::min(m_top, rect.y());
89        m_right = std::max(m_right, rect.maxX());
90        m_bottom = std::max(m_bottom, rect.maxY());
91        m_left = std::min(m_left, rect.x());
92    }
93
94private:
95    float m_top;
96    float m_right;
97    float m_bottom;
98    float m_left;
99};
100
101inline bool operator==(const FloatBoxExtent& a, const FloatBoxExtent& b)
102{
103    return a.top() == b.top()
104        && a.right() == b.right()
105        && a.bottom() == b.bottom()
106        && a.left() == b.left();
107}
108
109inline bool operator!=(const FloatBoxExtent& a, const FloatBoxExtent& b)
110{
111    return !(a == b);
112}
113
114inline void operator+=(FloatBoxExtent& a, const FloatBoxExtent& b)
115{
116    a.setTop(a.top() + b.top());
117    a.setRight(a.right() + b.right());
118    a.setBottom(a.bottom() + b.bottom());
119    a.setLeft(a.left() + b.left());
120}
121
122} // namespace WebCore
123
124
125#endif // FloatBoxExtent_h
126