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