1 /* 2 * Copyright (C) 2007 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_UI_REGION_H 18 #define ANDROID_UI_REGION_H 19 20 #include <stdint.h> 21 #include <sys/types.h> 22 23 #include <utils/Vector.h> 24 25 #include <ui/Rect.h> 26 27 #include <hardware/copybit.h> 28 29 namespace android { 30 // --------------------------------------------------------------------------- 31 32 class String8; 33 34 // --------------------------------------------------------------------------- 35 class Region 36 { 37 public: 38 Region(); 39 Region(const Region& rhs); 40 explicit Region(const Rect& rhs); 41 explicit Region(const void* buffer); 42 ~Region(); 43 44 Region& operator = (const Region& rhs); 45 46 inline bool isEmpty() const { return mBounds.isEmpty(); } 47 inline bool isRect() const { return mStorage.isEmpty(); } 48 49 inline Rect getBounds() const { return mBounds; } 50 inline Rect bounds() const { return getBounds(); } 51 52 // the region becomes its bounds 53 Region& makeBoundsSelf(); 54 55 void clear(); 56 void set(const Rect& r); 57 void set(uint32_t w, uint32_t h); 58 59 Region& orSelf(const Rect& rhs); 60 Region& andSelf(const Rect& rhs); 61 Region& subtractSelf(const Rect& rhs); 62 63 // boolean operators, applied on this 64 Region& orSelf(const Region& rhs); 65 Region& andSelf(const Region& rhs); 66 Region& subtractSelf(const Region& rhs); 67 68 // boolean operators 69 const Region merge(const Rect& rhs) const; 70 const Region intersect(const Rect& rhs) const; 71 const Region subtract(const Rect& rhs) const; 72 73 // boolean operators 74 const Region merge(const Region& rhs) const; 75 const Region intersect(const Region& rhs) const; 76 const Region subtract(const Region& rhs) const; 77 78 // these translate rhs first 79 Region& translateSelf(int dx, int dy); 80 Region& orSelf(const Region& rhs, int dx, int dy); 81 Region& andSelf(const Region& rhs, int dx, int dy); 82 Region& subtractSelf(const Region& rhs, int dx, int dy); 83 84 // these translate rhs first 85 const Region translate(int dx, int dy) const; 86 const Region merge(const Region& rhs, int dx, int dy) const; 87 const Region intersect(const Region& rhs, int dx, int dy) const; 88 const Region subtract(const Region& rhs, int dx, int dy) const; 89 90 // convenience operators overloads 91 inline const Region operator | (const Region& rhs) const; 92 inline const Region operator & (const Region& rhs) const; 93 inline const Region operator - (const Region& rhs) const; 94 inline const Region operator + (const Point& pt) const; 95 96 inline Region& operator |= (const Region& rhs); 97 inline Region& operator &= (const Region& rhs); 98 inline Region& operator -= (const Region& rhs); 99 inline Region& operator += (const Point& pt); 100 101 102 /* various ways to access the rectangle list */ 103 104 typedef Rect const* const_iterator; 105 106 const_iterator begin() const; 107 const_iterator end() const; 108 109 /* no user serviceable parts here... */ 110 111 size_t getRects(Vector<Rect>& rectList) const; 112 Rect const* getArray(size_t* count) const; 113 114 115 // add a rectangle to the internal list. This rectangle must 116 // be sorted in Y and X and must not make the region invalid. 117 void addRectUnchecked(int l, int t, int r, int b); 118 119 // flatten/unflatten a region to/from a raw buffer 120 ssize_t write(void* buffer, size_t size) const; 121 static ssize_t writeEmpty(void* buffer, size_t size); 122 123 ssize_t read(const void* buffer); 124 static bool isEmpty(void* buffer); 125 126 void dump(String8& out, const char* what, uint32_t flags=0) const; 127 void dump(const char* what, uint32_t flags=0) const; 128 129 private: 130 class rasterizer; 131 friend class rasterizer; 132 133 Region& operationSelf(const Rect& r, int op); 134 Region& operationSelf(const Region& r, int op); 135 Region& operationSelf(const Region& r, int dx, int dy, int op); 136 const Region operation(const Rect& rhs, int op) const; 137 const Region operation(const Region& rhs, int op) const; 138 const Region operation(const Region& rhs, int dx, int dy, int op) const; 139 140 static void boolean_operation(int op, Region& dst, 141 const Region& lhs, const Region& rhs, int dx, int dy); 142 static void boolean_operation(int op, Region& dst, 143 const Region& lhs, const Rect& rhs, int dx, int dy); 144 145 static void boolean_operation(int op, Region& dst, 146 const Region& lhs, const Region& rhs); 147 static void boolean_operation(int op, Region& dst, 148 const Region& lhs, const Rect& rhs); 149 150 static void translate(Region& reg, int dx, int dy); 151 static void translate(Region& dst, const Region& reg, int dx, int dy); 152 153 static bool validate(const Region& reg, const char* name); 154 155 Rect mBounds; 156 Vector<Rect> mStorage; 157 }; 158 159 160 const Region Region::operator | (const Region& rhs) const { 161 return merge(rhs); 162 } 163 const Region Region::operator & (const Region& rhs) const { 164 return intersect(rhs); 165 } 166 const Region Region::operator - (const Region& rhs) const { 167 return subtract(rhs); 168 } 169 const Region Region::operator + (const Point& pt) const { 170 return translate(pt.x, pt.y); 171 } 172 173 174 Region& Region::operator |= (const Region& rhs) { 175 return orSelf(rhs); 176 } 177 Region& Region::operator &= (const Region& rhs) { 178 return andSelf(rhs); 179 } 180 Region& Region::operator -= (const Region& rhs) { 181 return subtractSelf(rhs); 182 } 183 Region& Region::operator += (const Point& pt) { 184 return translateSelf(pt.x, pt.y); 185 } 186 187 // --------------------------------------------------------------------------- 188 189 struct region_iterator : public copybit_region_t { 190 region_iterator(const Region& region) 191 : b(region.begin()), e(region.end()) { 192 this->next = iterate; 193 } 194 private: 195 static int iterate(copybit_region_t const * self, copybit_rect_t* rect) { 196 region_iterator const* me = static_cast<region_iterator const*>(self); 197 if (me->b != me->e) { 198 *reinterpret_cast<Rect*>(rect) = *me->b++; 199 return 1; 200 } 201 return 0; 202 } 203 mutable Region::const_iterator b; 204 Region::const_iterator const e; 205 }; 206 207 // --------------------------------------------------------------------------- 208 }; // namespace android 209 210 #endif // ANDROID_UI_REGION_H 211 212
