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 #ifndef LayoutSize_h
32 #define LayoutSize_h
33
34 #include "platform/LayoutUnit.h"
35 #include "platform/geometry/FloatSize.h"
36 #include "platform/geometry/IntSize.h"
37
38 namespace blink {
39
40 enum AspectRatioFit {
41 AspectRatioFitShrink,
42 AspectRatioFitGrow
43 };
44
45 class LayoutSize {
46 public:
LayoutSize()47 LayoutSize() { }
LayoutSize(const IntSize & size)48 LayoutSize(const IntSize& size) : m_width(size.width()), m_height(size.height()) { }
LayoutSize(LayoutUnit width,LayoutUnit height)49 LayoutSize(LayoutUnit width, LayoutUnit height) : m_width(width), m_height(height) { }
50
LayoutSize(const FloatSize & size)51 explicit LayoutSize(const FloatSize& size) : m_width(size.width()), m_height(size.height()) { }
52
width()53 LayoutUnit width() const { return m_width; }
height()54 LayoutUnit height() const { return m_height; }
55
setWidth(LayoutUnit width)56 void setWidth(LayoutUnit width) { m_width = width; }
setHeight(LayoutUnit height)57 void setHeight(LayoutUnit height) { m_height = height; }
58
isEmpty()59 bool isEmpty() const { return m_width.rawValue() <= 0 || m_height.rawValue() <= 0; }
isZero()60 bool isZero() const { return !m_width && !m_height; }
61
aspectRatio()62 float aspectRatio() const { return m_width.toFloat() / m_height.toFloat(); }
63
expand(LayoutUnit width,LayoutUnit height)64 void expand(LayoutUnit width, LayoutUnit height)
65 {
66 m_width += width;
67 m_height += height;
68 }
69
shrink(LayoutUnit width,LayoutUnit height)70 void shrink(LayoutUnit width, LayoutUnit height)
71 {
72 m_width -= width;
73 m_height -= height;
74 }
75
scale(float scale)76 void scale(float scale)
77 {
78 m_width *= scale;
79 m_height *= scale;
80 }
81
scale(float widthScale,float heightScale)82 void scale(float widthScale, float heightScale)
83 {
84 m_width *= widthScale;
85 m_height *= heightScale;
86 }
87
expandedTo(const LayoutSize & other)88 LayoutSize expandedTo(const LayoutSize& other) const
89 {
90 return LayoutSize(m_width > other.m_width ? m_width : other.m_width,
91 m_height > other.m_height ? m_height : other.m_height);
92 }
93
shrunkTo(const LayoutSize & other)94 LayoutSize shrunkTo(const LayoutSize& other) const
95 {
96 return LayoutSize(m_width < other.m_width ? m_width : other.m_width,
97 m_height < other.m_height ? m_height : other.m_height);
98 }
99
clampNegativeToZero()100 void clampNegativeToZero()
101 {
102 *this = expandedTo(LayoutSize());
103 }
104
clampToMinimumSize(const LayoutSize & minimumSize)105 void clampToMinimumSize(const LayoutSize& minimumSize)
106 {
107 if (m_width < minimumSize.width())
108 m_width = minimumSize.width();
109 if (m_height < minimumSize.height())
110 m_height = minimumSize.height();
111 }
112
transposedSize()113 LayoutSize transposedSize() const
114 {
115 return LayoutSize(m_height, m_width);
116 }
117
fitToAspectRatio(const LayoutSize & aspectRatio,AspectRatioFit fit)118 LayoutSize fitToAspectRatio(const LayoutSize& aspectRatio, AspectRatioFit fit) const
119 {
120 float heightScale = height().toFloat() / aspectRatio.height().toFloat();
121 float widthScale = width().toFloat() / aspectRatio.width().toFloat();
122 if ((widthScale > heightScale) != (fit == AspectRatioFitGrow))
123 return LayoutSize(height() * aspectRatio.width() / aspectRatio.height(), height());
124 return LayoutSize(width(), width() * aspectRatio.height() / aspectRatio.width());
125 }
126
fraction()127 LayoutSize fraction() const
128 {
129 return LayoutSize(m_width.fraction(), m_height.fraction());
130 }
131
132 private:
133 LayoutUnit m_width, m_height;
134 };
135
136 inline LayoutSize& operator+=(LayoutSize& a, const LayoutSize& b)
137 {
138 a.setWidth(a.width() + b.width());
139 a.setHeight(a.height() + b.height());
140 return a;
141 }
142
143 inline 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
150 inline LayoutSize operator+(const LayoutSize& a, const LayoutSize& b)
151 {
152 return LayoutSize(a.width() + b.width(), a.height() + b.height());
153 }
154
155 inline LayoutSize operator-(const LayoutSize& a, const LayoutSize& b)
156 {
157 return LayoutSize(a.width() - b.width(), a.height() - b.height());
158 }
159
160 inline LayoutSize operator-(const LayoutSize& size)
161 {
162 return LayoutSize(-size.width(), -size.height());
163 }
164
165 inline bool operator==(const LayoutSize& a, const LayoutSize& b)
166 {
167 return a.width() == b.width() && a.height() == b.height();
168 }
169
170 inline bool operator!=(const LayoutSize& a, const LayoutSize& b)
171 {
172 return a.width() != b.width() || a.height() != b.height();
173 }
174
flooredIntSize(const LayoutSize & s)175 inline IntSize flooredIntSize(const LayoutSize& s)
176 {
177 return IntSize(s.width().floor(), s.height().floor());
178 }
179
roundedIntSize(const LayoutSize & s)180 inline IntSize roundedIntSize(const LayoutSize& s)
181 {
182 return IntSize(s.width().round(), s.height().round());
183 }
184
roundedLayoutSize(const FloatSize & s)185 inline LayoutSize roundedLayoutSize(const FloatSize& s)
186 {
187 return LayoutSize(s);
188 }
189
190 } // namespace blink
191
192 #endif // LayoutSize_h
193