1/*
2 * Copyright (c) 2012, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#pragma once
32
33#include "FloatSize.h"
34#include "IntSize.h"
35#include "LayoutUnit.h"
36
37namespace WTF {
38class TextStream;
39}
40
41namespace WebCore {
42
43class LayoutPoint;
44
45enum AspectRatioFit {
46 AspectRatioFitShrink,
47 AspectRatioFitGrow
48};
49
50class LayoutSize {
51public:
52 LayoutSize() : m_width(0), m_height(0) { }
53 LayoutSize(const IntSize& size) : m_width(size.width()), m_height(size.height()) { }
54 LayoutSize(LayoutUnit width, LayoutUnit height) : m_width(width), m_height(height) { }
55
56 explicit LayoutSize(const FloatSize& size) : m_width(size.width()), m_height(size.height()) { }
57
58 LayoutUnit width() const { return m_width; }
59 LayoutUnit height() const { return m_height; }
60
61 void setWidth(LayoutUnit width) { m_width = width; }
62 void setHeight(LayoutUnit height) { m_height = height; }
63
64 bool isEmpty() const { return m_width <= 0 || m_height <= 0; }
65 bool isZero() const { return !m_width && !m_height; }
66
67 float aspectRatio() const { return static_cast<float>(m_width) / static_cast<float>(m_height); }
68
69 void expand(LayoutUnit width, LayoutUnit height)
70 {
71 m_width += width;
72 m_height += height;
73 }
74
75 void shrink(LayoutUnit width, LayoutUnit height)
76 {
77 m_width -= width;
78 m_height -= height;
79 }
80
81 void scale(float scale)
82 {
83 m_width *= scale;
84 m_height *= scale;
85 }
86
87 void scale(float widthScale, float heightScale)
88 {
89 m_width *= widthScale;
90 m_height *= heightScale;
91 }
92
93 LayoutSize constrainedBetween(const LayoutSize& min, const LayoutSize& max) const;
94
95 LayoutSize expandedTo(const LayoutSize& other) const
96 {
97 return LayoutSize(m_width > other.m_width ? m_width : other.m_width,
98 m_height > other.m_height ? m_height : other.m_height);
99 }
100
101 LayoutSize shrunkTo(const LayoutSize& other) const
102 {
103 return LayoutSize(m_width < other.m_width ? m_width : other.m_width,
104 m_height < other.m_height ? m_height : other.m_height);
105 }
106
107 void clampNegativeToZero()
108 {
109 *this = expandedTo(LayoutSize());
110 }
111
112 void clampToMinimumSize(const LayoutSize& minimumSize)
113 {
114 if (m_width < minimumSize.width())
115 m_width = minimumSize.width();
116 if (m_height < minimumSize.height())
117 m_height = minimumSize.height();
118 }
119
120 LayoutSize transposedSize() const
121 {
122 return LayoutSize(m_height, m_width);
123 }
124
125 operator FloatSize() const { return FloatSize(m_width, m_height); }
126
127 LayoutSize fitToAspectRatio(const LayoutSize& aspectRatio, AspectRatioFit fit) const
128 {
129 float heightScale = height().toFloat() / aspectRatio.height().toFloat();
130 float widthScale = width().toFloat() / aspectRatio.width().toFloat();
131
132 if ((widthScale > heightScale) != (fit == AspectRatioFitGrow))
133 return LayoutSize(height() * aspectRatio.width() / aspectRatio.height(), height());
134
135 return LayoutSize(width(), width() * aspectRatio.height() / aspectRatio.width());
136 }
137
138private:
139 LayoutUnit m_width;
140 LayoutUnit m_height;
141};
142
143inline LayoutSize& operator+=(LayoutSize& a, const LayoutSize& b)
144{
145 a.setWidth(a.width() + b.width());
146 a.setHeight(a.height() + b.height());
147 return a;
148}
149
150inline LayoutSize& operator-=(LayoutSize& a, const LayoutSize& b)
151{
152 a.setWidth(a.width() - b.width());
153 a.setHeight(a.height() - b.height());
154 return a;
155}
156
157inline LayoutSize operator+(const LayoutSize& a, const LayoutSize& b)
158{
159 return LayoutSize(a.width() + b.width(), a.height() + b.height());
160}
161
162inline LayoutSize operator-(const LayoutSize& a, const LayoutSize& b)
163{
164 return LayoutSize(a.width() - b.width(), a.height() - b.height());
165}
166
167inline LayoutSize operator-(const LayoutSize& size)
168{
169 return LayoutSize(-size.width(), -size.height());
170}
171
172inline bool operator==(const LayoutSize& a, const LayoutSize& b)
173{
174 return a.width() == b.width() && a.height() == b.height();
175}
176
177inline bool operator!=(const LayoutSize& a, const LayoutSize& b)
178{
179 return a.width() != b.width() || a.height() != b.height();
180}
181
182inline IntSize flooredIntSize(const LayoutSize& s)
183{
184 return IntSize(s.width().floor(), s.height().floor());
185}
186
187inline IntSize roundedIntSize(const LayoutSize& s)
188{
189 return IntSize(s.width().round(), s.height().round());
190}
191
192inline FloatSize floorSizeToDevicePixels(const LayoutSize& size, float pixelSnappingFactor)
193{
194 return FloatSize(floorToDevicePixel(size.width(), pixelSnappingFactor), floorToDevicePixel(size.height(), pixelSnappingFactor));
195}
196
197WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const LayoutSize&);
198
199} // namespace WebCore
200
201