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