WebCore/FloatSize.h

   1 /*
   2  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
   3  * Copyright (C) 2005 Nokia.  All rights reserved.
   4  *               2008 Eric Seidel <eric@webkit.org>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #ifndef FloatSize_h
  29 #define FloatSize_h
  30
  31 #include <wtf/Platform.h>
  32
  33 #include <CoreGraphics/CoreGraphics.h>
  34
  35 #if PLATFORM(CG)
  36 typedef struct CGSize CGSize;
  37 #endif
  38
  39
  40 #ifndef NSSize
  41 #define NSSize CGSize
  42 #endif
  43
  44
  45 namespace WebCore {
  46
  47 class IntSize;
  48
  49 class FloatSize {
  50 public:
  51     FloatSize() : m_width(0), m_height(0) { }
  52     FloatSize(float width, float height) : m_width(width), m_height(height) { }
  53     FloatSize(const IntSize&);
  54
  55     static FloatSize narrowPrecision(double width, double height);
  56
  57     float width() const { return m_width; }
  58     float height() const { return m_height; }
  59
  60     void setWidth(float width) { m_width = width; }
  61     void setHeight(float height) { m_height = height; }
  62
  63     bool isEmpty() const { return m_width <= 0 || m_height <= 0; }
  64
  65     FloatSize expandedTo(const FloatSize& other) const
  66     {
  67         return FloatSize(m_width > other.m_width ? m_width : other.m_width,
  68             m_height > other.m_height ? m_height : other.m_height);
  69     }
  70
  71     FloatSize shrunkTo(const FloatSize& other) const
  72     {
  73        return FloatSize(m_width < other.m_width ? m_width : other.m_width,
  74            m_height < other.m_height ? m_height : other.m_height);
  75     }
  76
  77 #if PLATFORM(CG)
  78     explicit FloatSize(const CGSize&); // don't do this implicitly since it's lossy
  79     operator CGSize() const;
  80 #endif
  81
  82
  83 private:
  84     float m_width, m_height;
  85 };
  86
  87 inline FloatSize& operator+=(FloatSize& a, const FloatSize& b)
  88 {
  89     a.setWidth(a.width() + b.width());
  90     a.setHeight(a.height() + b.height());
  91     return a;
  92 }
  93
  94 inline FloatSize& operator-=(FloatSize& a, const FloatSize& b)
  95 {
  96     a.setWidth(a.width() - b.width());
  97     a.setHeight(a.height() - b.height());
  98     return a;
  99 }
 100
 101 inline FloatSize operator+(const FloatSize& a, const FloatSize& b)
 102 {
 103     return FloatSize(a.width() + b.width(), a.height() + b.height());
 104 }
 105
 106 inline FloatSize operator-(const FloatSize& a, const FloatSize& b)
 107 {
 108     return FloatSize(a.width() - b.width(), a.height() - b.height());
 109 }
 110
 111 inline FloatSize operator-(const FloatSize& size)
 112 {
 113     return FloatSize(-size.width(), -size.height());
 114 }
 115
 116 inline bool operator==(const FloatSize& a, const FloatSize& b)
 117 {
 118     return a.width() == b.width() && a.height() == b.height();
 119 }
 120
 121 inline bool operator!=(const FloatSize& a, const FloatSize& b)
 122 {
 123     return a.width() != b.width() || a.height() != b.height();
 124 }
 125
 126 } // namespace WebCore
 127
 128 #endif // FloatSize_h