Rect.h revision e4aa95e3627226bcb0d8cc3e42dca6e4df8f421c
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_HWUI_RECT_H 18#define ANDROID_HWUI_RECT_H 19 20#include <cmath> 21#include <SkRect.h> 22 23#include <utils/Log.h> 24 25#include "Vertex.h" 26 27namespace android { 28namespace uirenderer { 29 30#define RECT_STRING "%7.2f %7.2f %7.2f %7.2f" 31#define RECT_ARGS(r) \ 32 (r).left, (r).top, (r).right, (r).bottom 33#define SK_RECT_ARGS(r) \ 34 (r).left(), (r).top(), (r).right(), (r).bottom() 35 36/////////////////////////////////////////////////////////////////////////////// 37// Structs 38/////////////////////////////////////////////////////////////////////////////// 39 40class Rect { 41public: 42 float left; 43 float top; 44 float right; 45 float bottom; 46 47 // Used by Region 48 typedef float value_type; 49 50 // we don't provide copy-ctor and operator= on purpose 51 // because we want the compiler generated versions 52 53 inline Rect(): 54 left(0), 55 top(0), 56 right(0), 57 bottom(0) { 58 } 59 60 inline Rect(float left, float top, float right, float bottom): 61 left(left), 62 top(top), 63 right(right), 64 bottom(bottom) { 65 } 66 67 inline Rect(float width, float height): 68 left(0.0f), 69 top(0.0f), 70 right(width), 71 bottom(height) { 72 } 73 74 inline Rect(const SkRect& rect): 75 left(rect.fLeft), 76 top(rect.fTop), 77 right(rect.fRight), 78 bottom(rect.fBottom) { 79 } 80 81 friend int operator==(const Rect& a, const Rect& b) { 82 return !memcmp(&a, &b, sizeof(a)); 83 } 84 85 friend int operator!=(const Rect& a, const Rect& b) { 86 return memcmp(&a, &b, sizeof(a)); 87 } 88 89 inline void clear() { 90 left = top = right = bottom = 0.0f; 91 } 92 93 inline bool isEmpty() const { 94 // this is written in such way this it'll handle NANs to return 95 // true (empty) 96 return !((left < right) && (top < bottom)); 97 } 98 99 inline void setEmpty() { 100 left = top = right = bottom = 0.0f; 101 } 102 103 inline void set(float left, float top, float right, float bottom) { 104 this->left = left; 105 this->right = right; 106 this->top = top; 107 this->bottom = bottom; 108 } 109 110 inline void set(const Rect& r) { 111 set(r.left, r.top, r.right, r.bottom); 112 } 113 114 inline float getWidth() const { 115 return right - left; 116 } 117 118 inline float getHeight() const { 119 return bottom - top; 120 } 121 122 bool intersects(float l, float t, float r, float b) const { 123 return !intersectWith(l, t, r, b).isEmpty(); 124 } 125 126 bool intersects(const Rect& r) const { 127 return intersects(r.left, r.top, r.right, r.bottom); 128 } 129 130 bool intersect(float l, float t, float r, float b) { 131 Rect tmp(l, t, r, b); 132 intersectWith(tmp); 133 if (!tmp.isEmpty()) { 134 set(tmp); 135 return true; 136 } 137 return false; 138 } 139 140 bool intersect(const Rect& r) { 141 return intersect(r.left, r.top, r.right, r.bottom); 142 } 143 144 inline bool contains(float l, float t, float r, float b) const { 145 return l >= left && t >= top && r <= right && b <= bottom; 146 } 147 148 inline bool contains(const Rect& r) const { 149 return contains(r.left, r.top, r.right, r.bottom); 150 } 151 152 bool unionWith(const Rect& r) { 153 if (r.left < r.right && r.top < r.bottom) { 154 if (left < right && top < bottom) { 155 if (left > r.left) left = r.left; 156 if (top > r.top) top = r.top; 157 if (right < r.right) right = r.right; 158 if (bottom < r.bottom) bottom = r.bottom; 159 return true; 160 } else { 161 left = r.left; 162 top = r.top; 163 right = r.right; 164 bottom = r.bottom; 165 return true; 166 } 167 } 168 return false; 169 } 170 171 void translate(float dx, float dy) { 172 left += dx; 173 right += dx; 174 top += dy; 175 bottom += dy; 176 } 177 178 void inset(float delta) { 179 outset(-delta); 180 } 181 182 void outset(float delta) { 183 left -= delta; 184 top -= delta; 185 right += delta; 186 bottom += delta; 187 } 188 189 /** 190 * Similar to snapToPixelBoundaries, but estimates bounds conservatively to handle GL rounding 191 * errors. 192 * 193 * This function should be used whenever estimating the damage rect of geometry already mapped 194 * into layer space. 195 */ 196 void snapGeometryToPixelBoundaries(bool snapOut) { 197 if (snapOut) { 198 /* For AA geometry with a ramp perimeter, don't snap by rounding - AA geometry will have 199 * a 0.5 pixel perimeter not accounted for in its bounds. Instead, snap by 200 * conservatively rounding out the bounds with floor/ceil. 201 * 202 * In order to avoid changing integer bounds with floor/ceil due to rounding errors 203 * inset the bounds first by the fudge factor. Very small fraction-of-a-pixel errors 204 * from this inset will only incur similarly small errors in output, due to transparency 205 * in extreme outside of the geometry. 206 */ 207 left = floorf(left + Vertex::GeometryFudgeFactor()); 208 top = floorf(top + Vertex::GeometryFudgeFactor()); 209 right = ceilf(right - Vertex::GeometryFudgeFactor()); 210 bottom = ceilf(bottom - Vertex::GeometryFudgeFactor()); 211 } else { 212 /* For other geometry, we do the regular rounding in order to snap, but also outset the 213 * bounds by a fudge factor. This ensures that ambiguous geometry (e.g. a non-AA Rect 214 * with top left at (0.5, 0.5)) will err on the side of a larger damage rect. 215 */ 216 left = floorf(left + 0.5f - Vertex::GeometryFudgeFactor()); 217 top = floorf(top + 0.5f - Vertex::GeometryFudgeFactor()); 218 right = floorf(right + 0.5f + Vertex::GeometryFudgeFactor()); 219 bottom = floorf(bottom + 0.5f + Vertex::GeometryFudgeFactor()); 220 } 221 } 222 223 void snapToPixelBoundaries() { 224 left = floorf(left + 0.5f); 225 top = floorf(top + 0.5f); 226 right = floorf(right + 0.5f); 227 bottom = floorf(bottom + 0.5f); 228 } 229 230 void roundOut() { 231 left = floorf(left); 232 top = floorf(top); 233 right = ceilf(right); 234 bottom = ceilf(bottom); 235 } 236 237 void dump(const char* label) const { 238 ALOGD("%s[l=%f t=%f r=%f b=%f]", label ? label : "Rect", left, top, right, bottom); 239 } 240 241private: 242 void intersectWith(Rect& tmp) const { 243 tmp.left = fmaxf(left, tmp.left); 244 tmp.top = fmaxf(top, tmp.top); 245 tmp.right = fminf(right, tmp.right); 246 tmp.bottom = fminf(bottom, tmp.bottom); 247 } 248 249 Rect intersectWith(float l, float t, float r, float b) const { 250 Rect tmp; 251 tmp.left = fmaxf(left, l); 252 tmp.top = fmaxf(top, t); 253 tmp.right = fminf(right, r); 254 tmp.bottom = fminf(bottom, b); 255 return tmp; 256 } 257 258}; // class Rect 259 260}; // namespace uirenderer 261}; // namespace android 262 263#endif // ANDROID_HWUI_RECT_H 264