1 /*
2 * Copyright (C) 2003, 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2005 Nokia. 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 #include "config.h"
28 #include "FloatRect.h"
29
30 #include "FloatConversion.h"
31 #include "IntRect.h"
32 #include <algorithm>
33 #include <math.h>
34
35 using std::max;
36 using std::min;
37
38 namespace WebCore {
39
FloatRect(const IntRect & r)40 FloatRect::FloatRect(const IntRect& r) : m_location(r.location()), m_size(r.size())
41 {
42 }
43
narrowPrecision(double x,double y,double width,double height)44 FloatRect FloatRect::narrowPrecision(double x, double y, double width, double height)
45 {
46 return FloatRect(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y), narrowPrecisionToFloat(width), narrowPrecisionToFloat(height));
47 }
48
intersects(const FloatRect & other) const49 bool FloatRect::intersects(const FloatRect& other) const
50 {
51 // Checking emptiness handles negative widths as well as zero.
52 return !isEmpty() && !other.isEmpty()
53 && x() < other.right() && other.x() < right()
54 && y() < other.bottom() && other.y() < bottom();
55 }
56
contains(const FloatRect & other) const57 bool FloatRect::contains(const FloatRect& other) const
58 {
59 return x() <= other.x() && right() >= other.right()
60 && y() <= other.y() && bottom() >= other.bottom();
61 }
62
intersect(const FloatRect & other)63 void FloatRect::intersect(const FloatRect& other)
64 {
65 float l = max(x(), other.x());
66 float t = max(y(), other.y());
67 float r = min(right(), other.right());
68 float b = min(bottom(), other.bottom());
69
70 // Return a clean empty rectangle for non-intersecting cases.
71 if (l >= r || t >= b) {
72 l = 0;
73 t = 0;
74 r = 0;
75 b = 0;
76 }
77
78 m_location.setX(l);
79 m_location.setY(t);
80 m_size.setWidth(r - l);
81 m_size.setHeight(b - t);
82 }
83
unite(const FloatRect & other)84 void FloatRect::unite(const FloatRect& other)
85 {
86 // Handle empty special cases first.
87 if (other.isEmpty())
88 return;
89 if (isEmpty()) {
90 *this = other;
91 return;
92 }
93
94 float l = min(x(), other.x());
95 float t = min(y(), other.y());
96 float r = max(right(), other.right());
97 float b = max(bottom(), other.bottom());
98
99 m_location.setX(l);
100 m_location.setY(t);
101 m_size.setWidth(r - l);
102 m_size.setHeight(b - t);
103 }
104
scale(float sx,float sy)105 void FloatRect::scale(float sx, float sy)
106 {
107 m_location.setX(x() * sx);
108 m_location.setY(y() * sy);
109 m_size.setWidth(width() * sx);
110 m_size.setHeight(height() * sy);
111 }
112
enclosingIntRect(const FloatRect & rect)113 IntRect enclosingIntRect(const FloatRect& rect)
114 {
115 int l = static_cast<int>(floorf(rect.x()));
116 int t = static_cast<int>(floorf(rect.y()));
117 int r = static_cast<int>(ceilf(rect.right()));
118 int b = static_cast<int>(ceilf(rect.bottom()));
119 return IntRect(l, t, r - l, b - t);
120 }
121
mapRect(const FloatRect & r,const FloatRect & srcRect,const FloatRect & destRect)122 FloatRect mapRect(const FloatRect& r, const FloatRect& srcRect, const FloatRect& destRect)
123 {
124 if (srcRect.width() == 0 || srcRect.height() == 0)
125 return FloatRect();
126
127 float widthScale = destRect.width() / srcRect.width();
128 float heightScale = destRect.height() / srcRect.height();
129 return FloatRect(destRect.x() + (r.x() - srcRect.x()) * widthScale,
130 destRect.y() + (r.y() - srcRect.y()) * heightScale,
131 r.width() * widthScale, r.height() * heightScale);
132 }
133
134 }
135