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 LayoutRect_h 32 #define LayoutRect_h 33 34 #include "platform/geometry/IntRect.h" 35 #include "platform/geometry/LayoutBoxExtent.h" 36 #include "platform/geometry/LayoutPoint.h" 37 #include "wtf/Vector.h" 38 39 namespace WebCore { 40 41 class FloatRect; 42 43 class PLATFORM_EXPORT LayoutRect { 44 public: 45 LayoutRect() { } 46 LayoutRect(const LayoutPoint& location, const LayoutSize& size) 47 : m_location(location), m_size(size) { } 48 LayoutRect(LayoutUnit x, LayoutUnit y, LayoutUnit width, LayoutUnit height) 49 : m_location(LayoutPoint(x, y)), m_size(LayoutSize(width, height)) { } 50 LayoutRect(const FloatPoint& location, const FloatSize& size) 51 : m_location(location), m_size(size) { } 52 LayoutRect(const IntRect& rect) : m_location(rect.location()), m_size(rect.size()) { } 53 54 explicit LayoutRect(const FloatRect&); // don't do this implicitly since it's lossy 55 56 LayoutPoint location() const { return m_location; } 57 LayoutSize size() const { return m_size; } 58 59 IntPoint pixelSnappedLocation() const { return roundedIntPoint(m_location); } 60 IntSize pixelSnappedSize() const { return IntSize(snapSizeToPixel(m_size.width(), m_location.x()), snapSizeToPixel(m_size.height(), m_location.y())); } 61 62 void setLocation(const LayoutPoint& location) { m_location = location; } 63 void setSize(const LayoutSize& size) { m_size = size; } 64 65 LayoutUnit x() const { return m_location.x(); } 66 LayoutUnit y() const { return m_location.y(); } 67 LayoutUnit maxX() const { return x() + width(); } 68 LayoutUnit maxY() const { return y() + height(); } 69 LayoutUnit width() const { return m_size.width(); } 70 LayoutUnit height() const { return m_size.height(); } 71 72 int pixelSnappedX() const { return x().round(); } 73 int pixelSnappedY() const { return y().round(); } 74 int pixelSnappedWidth() const { return snapSizeToPixel(width(), x()); } 75 int pixelSnappedHeight() const { return snapSizeToPixel(height(), y()); } 76 int pixelSnappedMaxX() const { return (m_location.x() + m_size.width()).round(); } 77 int pixelSnappedMaxY() const { return (m_location.y() + m_size.height()).round(); } 78 79 void setX(LayoutUnit x) { m_location.setX(x); } 80 void setY(LayoutUnit y) { m_location.setY(y); } 81 void setWidth(LayoutUnit width) { m_size.setWidth(width); } 82 void setHeight(LayoutUnit height) { m_size.setHeight(height); } 83 84 bool isEmpty() const { return m_size.isEmpty(); } 85 86 // NOTE: The result is rounded to integer values, and thus may be not the exact 87 // center point. 88 LayoutPoint center() const { return LayoutPoint(x() + width() / 2, y() + height() / 2); } 89 90 void move(const LayoutSize& size) { m_location += size; } 91 void moveBy(const LayoutPoint& offset) { m_location.move(offset.x(), offset.y()); } 92 void move(LayoutUnit dx, LayoutUnit dy) { m_location.move(dx, dy); } 93 94 void expand(const LayoutSize& size) { m_size += size; } 95 void expand(const LayoutBoxExtent& box) 96 { 97 m_location.move(-box.left(), -box.top()); 98 m_size.expand(box.left() + box.right(), box.top() + box.bottom()); 99 } 100 void expand(LayoutUnit dw, LayoutUnit dh) { m_size.expand(dw, dh); } 101 void contract(const LayoutSize& size) { m_size -= size; } 102 void contract(const LayoutBoxExtent& box) 103 { 104 m_location.move(box.left(), box.top()); 105 m_size.shrink(box.left() + box.right(), box.top() + box.bottom()); 106 } 107 void contract(LayoutUnit dw, LayoutUnit dh) { m_size.expand(-dw, -dh); } 108 109 void shiftXEdgeTo(LayoutUnit edge) 110 { 111 LayoutUnit delta = edge - x(); 112 setX(edge); 113 setWidth(std::max<LayoutUnit>(0, width() - delta)); 114 } 115 void shiftMaxXEdgeTo(LayoutUnit edge) 116 { 117 LayoutUnit delta = edge - maxX(); 118 setWidth(std::max<LayoutUnit>(0, width() + delta)); 119 } 120 void shiftYEdgeTo(LayoutUnit edge) 121 { 122 LayoutUnit delta = edge - y(); 123 setY(edge); 124 setHeight(std::max<LayoutUnit>(0, height() - delta)); 125 } 126 void shiftMaxYEdgeTo(LayoutUnit edge) 127 { 128 LayoutUnit delta = edge - maxY(); 129 setHeight(std::max<LayoutUnit>(0, height() + delta)); 130 } 131 132 LayoutPoint minXMinYCorner() const { return m_location; } // typically topLeft 133 LayoutPoint maxXMinYCorner() const { return LayoutPoint(m_location.x() + m_size.width(), m_location.y()); } // typically topRight 134 LayoutPoint minXMaxYCorner() const { return LayoutPoint(m_location.x(), m_location.y() + m_size.height()); } // typically bottomLeft 135 LayoutPoint maxXMaxYCorner() const { return LayoutPoint(m_location.x() + m_size.width(), m_location.y() + m_size.height()); } // typically bottomRight 136 137 bool intersects(const LayoutRect&) const; 138 bool contains(const LayoutRect&) const; 139 140 // This checks to see if the rect contains x,y in the traditional sense. 141 // Equivalent to checking if the rect contains a 1x1 rect below and to the right of (px,py). 142 bool contains(LayoutUnit px, LayoutUnit py) const 143 { return px >= x() && px < maxX() && py >= y() && py < maxY(); } 144 bool contains(const LayoutPoint& point) const { return contains(point.x(), point.y()); } 145 146 void intersect(const LayoutRect&); 147 void unite(const LayoutRect&); 148 void uniteIfNonZero(const LayoutRect&); 149 150 void inflateX(LayoutUnit dx) 151 { 152 m_location.setX(m_location.x() - dx); 153 m_size.setWidth(m_size.width() + dx + dx); 154 } 155 void inflateY(LayoutUnit dy) 156 { 157 m_location.setY(m_location.y() - dy); 158 m_size.setHeight(m_size.height() + dy + dy); 159 } 160 void inflate(LayoutUnit d) { inflateX(d); inflateY(d); } 161 void scale(float s); 162 void scale(float xAxisScale, float yAxisScale); 163 164 LayoutRect transposedRect() const { return LayoutRect(m_location.transposedPoint(), m_size.transposedSize()); } 165 166 static LayoutRect infiniteRect() 167 { 168 // Return a rect that is slightly smaller than the true max rect to allow pixelSnapping to round up to the nearest IntRect without overflowing. 169 return LayoutRect(LayoutUnit::nearlyMin() / 2, LayoutUnit::nearlyMin() / 2, LayoutUnit::nearlyMax(), LayoutUnit::nearlyMax()); 170 } 171 172 private: 173 LayoutPoint m_location; 174 LayoutSize m_size; 175 }; 176 177 inline LayoutRect intersection(const LayoutRect& a, const LayoutRect& b) 178 { 179 LayoutRect c = a; 180 c.intersect(b); 181 return c; 182 } 183 184 inline LayoutRect unionRect(const LayoutRect& a, const LayoutRect& b) 185 { 186 LayoutRect c = a; 187 c.unite(b); 188 return c; 189 } 190 191 PLATFORM_EXPORT LayoutRect unionRect(const Vector<LayoutRect>&); 192 193 inline bool operator==(const LayoutRect& a, const LayoutRect& b) 194 { 195 return a.location() == b.location() && a.size() == b.size(); 196 } 197 198 inline bool operator!=(const LayoutRect& a, const LayoutRect& b) 199 { 200 return a.location() != b.location() || a.size() != b.size(); 201 } 202 203 inline IntRect pixelSnappedIntRect(const LayoutRect& rect) 204 { 205 return IntRect(roundedIntPoint(rect.location()), IntSize( 206 snapSizeToPixel(rect.width(), rect.x()), 207 snapSizeToPixel(rect.height(), rect.y()))); 208 } 209 210 PLATFORM_EXPORT IntRect enclosingIntRect(const LayoutRect&); 211 PLATFORM_EXPORT LayoutRect enclosingLayoutRect(const FloatRect&); 212 213 inline IntRect pixelSnappedIntRect(LayoutUnit left, LayoutUnit top, LayoutUnit width, LayoutUnit height) 214 { 215 return IntRect(left.round(), top.round(), snapSizeToPixel(width, left), snapSizeToPixel(height, top)); 216 } 217 218 inline IntRect pixelSnappedIntRectFromEdges(LayoutUnit left, LayoutUnit top, LayoutUnit right, LayoutUnit bottom) 219 { 220 return IntRect(left.round(), top.round(), snapSizeToPixel(right - left, left), snapSizeToPixel(bottom - top, top)); 221 } 222 223 inline IntRect pixelSnappedIntRect(LayoutPoint location, LayoutSize size) 224 { 225 return IntRect(roundedIntPoint(location), pixelSnappedIntSize(size, location)); 226 } 227 228 } // namespace WebCore 229 230 #endif // LayoutRect_h 231
