KHtml

FloatRect.cpp
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26 
27 #include "FloatRect.h"
28 
29 #include "FloatConversion.h"
30 #include <algorithm>
31 
32 using std::max;
33 using std::min;
34 
35 namespace WebCore
36 {
37 
38 FloatRect::FloatRect(const IntRect &r) : m_location(r.location()), m_size(r.size())
39 {
40 }
41 
42 FloatRect FloatRect::narrowPrecision(double x, double y, double width, double height)
43 {
44  return FloatRect(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y), narrowPrecisionToFloat(width), narrowPrecisionToFloat(height));
45 }
46 
47 bool FloatRect::intersects(const FloatRect &other) const
48 {
49  // Checking emptiness handles negative widths as well as zero.
50  return !isEmpty() && !other.isEmpty()
51  && x() < other.right() && other.x() < right()
52  && y() < other.bottom() && other.y() < bottom();
53 }
54 
55 bool FloatRect::contains(const FloatRect &other) const
56 {
57  return x() <= other.x() && right() >= other.right()
58  && y() <= other.y() && bottom() >= other.bottom();
59 }
60 
61 void FloatRect::intersect(const FloatRect &other)
62 {
63  float l = max(x(), other.x());
64  float t = max(y(), other.y());
65  float r = min(right(), other.right());
66  float b = min(bottom(), other.bottom());
67 
68  // Return a clean empty rectangle for non-intersecting cases.
69  if (l >= r || t >= b) {
70  l = 0;
71  t = 0;
72  r = 0;
73  b = 0;
74  }
75 
76  m_location.setX(l);
77  m_location.setY(t);
78  m_size.setWidth(r - l);
79  m_size.setHeight(b - t);
80 }
81 
82 void FloatRect::unite(const FloatRect &other)
83 {
84  // Handle empty special cases first.
85  if (other.isEmpty()) {
86  return;
87  }
88  if (isEmpty()) {
89  *this = other;
90  return;
91  }
92 
93  float l = min(x(), other.x());
94  float t = min(y(), other.y());
95  float r = max(right(), other.right());
96  float b = max(bottom(), other.bottom());
97 
98  m_location.setX(l);
99  m_location.setY(t);
100  m_size.setWidth(r - l);
101  m_size.setHeight(b - t);
102 }
103 
104 void FloatRect::scale(float s)
105 {
106  m_location.setX(x() * s);
107  m_location.setY(y() * s);
108  m_size.setWidth(width() * s);
109  m_size.setHeight(height() * s);
110 }
111 
112 IntRect enclosingIntRect(const FloatRect &rect)
113 {
114  int l = static_cast<int>(rect.x());
115  int t = static_cast<int>(rect.y());
116  // FIXME: These two need to be a "ceiling" operation, not rounding.
117  // We changed them to do "+ 0.5f" to compile on Win32 where there's
118  // no ceilf, but they should be changed back to "ceiling" at some point
119  // and we should provide an implementation of ceilf for Win32.
120  int r = static_cast<int>(rect.right() + 0.5f);
121  int b = static_cast<int>(rect.bottom() + 0.5f);
122  return IntRect(l, t, r - l, b - t);
123 }
124 
125 }
QTextStream & right(QTextStream &stream)
QVariant location(const QVariant &res)
QTextStream & right(QTextStream &s)
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