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 "IntPoint.h"
32#include <wtf/MathExtras.h>
33
34#if PLATFORM(QT)
35QT_BEGIN_NAMESPACE
36class QSizeF;
37QT_END_NAMESPACE
38#endif
39
40#if PLATFORM(BLACKBERRY)
41namespace BlackBerry {
42namespace Platform {
43class FloatSize;
44}
45}
46#endif
47
48#if USE(CG)
49typedef struct CGSize CGSize;
50#endif
51
52#if PLATFORM(MAC)
53#ifdef NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES
54typedef struct CGSize NSSize;
55#else
56typedef struct _NSSize NSSize;
57#endif
58#endif
59
60namespace WebCore {
61
62class IntSize;
63class LayoutSize;
64
65class FloatSize {
66public:
67    FloatSize() : m_width(0), m_height(0) { }
68    FloatSize(float width, float height) : m_width(width), m_height(height) { }
69    FloatSize(const IntSize&);
70    FloatSize(const LayoutSize&);
71
72    static FloatSize narrowPrecision(double width, double height);
73
74    float width() const { return m_width; }
75    float height() const { return m_height; }
76
77    void setWidth(float width) { m_width = width; }
78    void setHeight(float height) { m_height = height; }
79
80    bool isEmpty() const { return m_width <= 0 || m_height <= 0; }
81    bool isZero() const;
82    bool isExpressibleAsIntSize() const;
83
84    float aspectRatio() const { return m_width / m_height; }
85
86    void expand(float width, float height)
87    {
88        m_width += width;
89        m_height += height;
90    }
91
92    void scale(float s) { scale(s, s); }
93
94    void scale(float scaleX, float scaleY)
95    {
96        m_width *= scaleX;
97        m_height *= scaleY;
98    }
99
100    FloatSize expandedTo(const FloatSize& other) const
101    {
102        return FloatSize(m_width > other.m_width ? m_width : other.m_width,
103            m_height > other.m_height ? m_height : other.m_height);
104    }
105
106    FloatSize shrunkTo(const FloatSize& other) const
107    {
108       return FloatSize(m_width < other.m_width ? m_width : other.m_width,
109           m_height < other.m_height ? m_height : other.m_height);
110    }
111
112    float diagonalLength() const;
113    float diagonalLengthSquared() const
114    {
115        return m_width * m_width + m_height * m_height;
116    }
117
118    FloatSize transposedSize() const
119    {
120        return FloatSize(m_height, m_width);
121    }
122
123#if PLATFORM(QT)
124    explicit FloatSize(const QSizeF&);
125    operator QSizeF() const;
126#endif
127
128#if PLATFORM(BLACKBERRY)
129    FloatSize(const BlackBerry::Platform::FloatSize&);
130    operator BlackBerry::Platform::FloatSize() const;
131#endif
132
133#if USE(CG)
134    explicit FloatSize(const CGSize&); // don't do this implicitly since it's lossy
135    operator CGSize() const;
136#endif
137
138#if (PLATFORM(MAC) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES))
139    explicit FloatSize(const NSSize &); // don't do this implicitly since it's lossy
140    operator NSSize() const;
141#endif
142
143private:
144    float m_width, m_height;
145};
146
147inline FloatSize& operator+=(FloatSize& a, const FloatSize& b)
148{
149    a.setWidth(a.width() + b.width());
150    a.setHeight(a.height() + b.height());
151    return a;
152}
153
154inline FloatSize& operator-=(FloatSize& a, const FloatSize& b)
155{
156    a.setWidth(a.width() - b.width());
157    a.setHeight(a.height() - b.height());
158    return a;
159}
160
161inline FloatSize operator+(const FloatSize& a, const FloatSize& b)
162{
163    return FloatSize(a.width() + b.width(), a.height() + b.height());
164}
165
166inline FloatSize operator-(const FloatSize& a, const FloatSize& b)
167{
168    return FloatSize(a.width() - b.width(), a.height() - b.height());
169}
170
171inline FloatSize operator-(const FloatSize& size)
172{
173    return FloatSize(-size.width(), -size.height());
174}
175
176inline FloatSize operator*(const FloatSize& a, const float b)
177{
178    return FloatSize(a.width() * b, a.height() * b);
179}
180
181inline FloatSize operator*(const float a, const FloatSize& b)
182{
183    return FloatSize(a * b.width(), a * b.height());
184}
185
186inline bool operator==(const FloatSize& a, const FloatSize& b)
187{
188    return a.width() == b.width() && a.height() == b.height();
189}
190
191inline bool operator!=(const FloatSize& a, const FloatSize& b)
192{
193    return a.width() != b.width() || a.height() != b.height();
194}
195
196inline IntSize roundedIntSize(const FloatSize& p)
197{
198    return IntSize(clampToInteger(roundf(p.width())), clampToInteger(roundf(p.height())));
199}
200
201inline IntSize flooredIntSize(const FloatSize& p)
202{
203    return IntSize(clampToInteger(floorf(p.width())), clampToInteger(floorf(p.height())));
204}
205
206inline IntSize expandedIntSize(const FloatSize& p)
207{
208    return IntSize(clampToInteger(ceilf(p.width())), clampToInteger(ceilf(p.height())));
209}
210
211inline IntPoint flooredIntPoint(const FloatSize& p)
212{
213    return IntPoint(clampToInteger(floorf(p.width())), clampToInteger(floorf(p.height())));
214}
215
216} // namespace WebCore
217
218#endif // FloatSize_h
219