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      1 /*
      2  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2013 Google 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 COMPUTER, 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 COMPUTER, 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 IntPoint_h
     28 #define IntPoint_h
     29 
     30 #include "core/platform/graphics/IntSize.h"
     31 #include "wtf/MathExtras.h"
     32 #include "wtf/Platform.h"
     33 
     34 #if OS(DARWIN)
     35 typedef struct CGPoint CGPoint;
     36 #ifdef NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES
     37 typedef struct CGPoint NSPoint;
     38 #else
     39 typedef struct _NSPoint NSPoint;
     40 #endif
     41 #endif
     42 
     43 namespace WebCore {
     44 
     45 class IntPoint {
     46 public:
     47     IntPoint() : m_x(0), m_y(0) { }
     48     IntPoint(int x, int y) : m_x(x), m_y(y) { }
     49     explicit IntPoint(const IntSize& size) : m_x(size.width()), m_y(size.height()) { }
     50 
     51     static IntPoint zero() { return IntPoint(); }
     52 
     53     int x() const { return m_x; }
     54     int y() const { return m_y; }
     55 
     56     void setX(int x) { m_x = x; }
     57     void setY(int y) { m_y = y; }
     58 
     59     void move(const IntSize& s) { move(s.width(), s.height()); }
     60     void moveBy(const IntPoint& offset) { move(offset.x(), offset.y()); }
     61     void move(int dx, int dy) { m_x += dx; m_y += dy; }
     62     void scale(float sx, float sy)
     63     {
     64         m_x = lroundf(static_cast<float>(m_x * sx));
     65         m_y = lroundf(static_cast<float>(m_y * sy));
     66     }
     67 
     68     IntPoint expandedTo(const IntPoint& other) const
     69     {
     70         return IntPoint(m_x > other.m_x ? m_x : other.m_x,
     71             m_y > other.m_y ? m_y : other.m_y);
     72     }
     73 
     74     IntPoint shrunkTo(const IntPoint& other) const
     75     {
     76         return IntPoint(m_x < other.m_x ? m_x : other.m_x,
     77             m_y < other.m_y ? m_y : other.m_y);
     78     }
     79 
     80     int distanceSquaredToPoint(const IntPoint&) const;
     81 
     82     void clampNegativeToZero()
     83     {
     84         *this = expandedTo(zero());
     85     }
     86 
     87     IntPoint transposedPoint() const
     88     {
     89         return IntPoint(m_y, m_x);
     90     }
     91 
     92 #if OS(DARWIN)
     93     explicit IntPoint(const CGPoint&); // don't do this implicitly since it's lossy
     94     operator CGPoint() const;
     95 
     96 #if !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
     97     explicit IntPoint(const NSPoint&); // don't do this implicitly since it's lossy
     98     operator NSPoint() const;
     99 #endif
    100 #endif
    101 
    102 private:
    103     int m_x, m_y;
    104 };
    105 
    106 inline IntPoint& operator+=(IntPoint& a, const IntSize& b)
    107 {
    108     a.move(b.width(), b.height());
    109     return a;
    110 }
    111 
    112 inline IntPoint& operator-=(IntPoint& a, const IntSize& b)
    113 {
    114     a.move(-b.width(), -b.height());
    115     return a;
    116 }
    117 
    118 inline IntPoint operator+(const IntPoint& a, const IntSize& b)
    119 {
    120     return IntPoint(a.x() + b.width(), a.y() + b.height());
    121 }
    122 
    123 inline IntPoint operator+(const IntPoint& a, const IntPoint& b)
    124 {
    125     return IntPoint(a.x() + b.x(), a.y() + b.y());
    126 }
    127 
    128 inline IntSize operator-(const IntPoint& a, const IntPoint& b)
    129 {
    130     return IntSize(a.x() - b.x(), a.y() - b.y());
    131 }
    132 
    133 inline IntPoint operator-(const IntPoint& a, const IntSize& b)
    134 {
    135     return IntPoint(a.x() - b.width(), a.y() - b.height());
    136 }
    137 
    138 inline IntPoint operator-(const IntPoint& point)
    139 {
    140     return IntPoint(-point.x(), -point.y());
    141 }
    142 
    143 inline bool operator==(const IntPoint& a, const IntPoint& b)
    144 {
    145     return a.x() == b.x() && a.y() == b.y();
    146 }
    147 
    148 inline bool operator!=(const IntPoint& a, const IntPoint& b)
    149 {
    150     return a.x() != b.x() || a.y() != b.y();
    151 }
    152 
    153 inline IntSize toIntSize(const IntPoint& a)
    154 {
    155     return IntSize(a.x(), a.y());
    156 }
    157 
    158 inline int IntPoint::distanceSquaredToPoint(const IntPoint& point) const
    159 {
    160     return ((*this) - point).diagonalLengthSquared();
    161 }
    162 
    163 } // namespace WebCore
    164 
    165 #endif // IntPoint_h
    166