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      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 
     35 namespace blink {
     36 
     37 class FloatBoxExtent {
     38 public:
     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 
     94 private:
     95     float m_top;
     96     float m_right;
     97     float m_bottom;
     98     float m_left;
     99 };
    100 
    101 inline 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 
    109 inline bool operator!=(const FloatBoxExtent& a, const FloatBoxExtent& b)
    110 {
    111     return !(a == b);
    112 }
    113 
    114 inline 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 blink
    123 
    124 
    125 #endif // FloatBoxExtent_h
    126