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: 47 LayoutSize() { } 48 LayoutSize(const IntSize& size) : m_width(size.width()), m_height(size.height()) { } 49 LayoutSize(LayoutUnit width, LayoutUnit height) : m_width(width), m_height(height) { } 50 51 explicit LayoutSize(const FloatSize& size) : m_width(size.width()), m_height(size.height()) { } 52 53 LayoutUnit width() const { return m_width; } 54 LayoutUnit height() const { return m_height; } 55 56 void setWidth(LayoutUnit width) { m_width = width; } 57 void setHeight(LayoutUnit height) { m_height = height; } 58 59 bool isEmpty() const { return m_width.rawValue() <= 0 || m_height.rawValue() <= 0; } 60 bool isZero() const { return !m_width && !m_height; } 61 62 float aspectRatio() const { return m_width.toFloat() / m_height.toFloat(); } 63 64 void expand(LayoutUnit width, LayoutUnit height) 65 { 66 m_width += width; 67 m_height += height; 68 } 69 70 void shrink(LayoutUnit width, LayoutUnit height) 71 { 72 m_width -= width; 73 m_height -= height; 74 } 75 76 void scale(float scale) 77 { 78 m_width *= scale; 79 m_height *= scale; 80 } 81 82 void scale(float widthScale, float heightScale) 83 { 84 m_width *= widthScale; 85 m_height *= heightScale; 86 } 87 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 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 } 99 100 void clampNegativeToZero() 101 { 102 *this = expandedTo(LayoutSize()); 103 } 104 105 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 } 112 113 LayoutSize transposedSize() const 114 { 115 return LayoutSize(m_height, m_width); 116 } 117 118 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 } 126 127 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 } 174 175 inline IntSize flooredIntSize(const LayoutSize& s) 176 { 177 return IntSize(s.width().floor(), s.height().floor()); 178 } 179 180 inline IntSize roundedIntSize(const LayoutSize& s) 181 { 182 return IntSize(s.width().round(), s.height().round()); 183 } 184 185 inline LayoutSize roundedLayoutSize(const FloatSize& s) 186 { 187 return LayoutSize(s); 188 } 189 190 } // namespace blink 191 192 #endif // LayoutSize_h 193
