vandebo@chromium.org | d3a8c94 | 2011-07-02 01:26:37 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 Google Inc. |
| 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 SkBitSet_DEFINED |
| 18 | #define SkBitSet_DEFINED |
| 19 | |
| 20 | #include "SkTypes.h" |
| 21 | |
| 22 | class SkBitSet { |
| 23 | public: |
| 24 | /** NumberOfBits must be greater than zero. |
| 25 | */ |
| 26 | explicit SkBitSet(int numberOfBits); |
| 27 | explicit SkBitSet(const SkBitSet& source); |
| 28 | |
| 29 | const SkBitSet& operator=(const SkBitSet& rhs); |
| 30 | bool operator==(const SkBitSet& rhs); |
| 31 | bool operator!=(const SkBitSet& rhs); |
| 32 | |
| 33 | /** Clear all data. |
| 34 | */ |
| 35 | void clearAll(); |
| 36 | |
| 37 | /** Set the value of the index-th bit. |
| 38 | */ |
| 39 | void setBit(int index, bool value); |
| 40 | |
| 41 | /** Test if bit index is set. |
| 42 | */ |
vandebo@chromium.org | 9859428 | 2011-07-25 22:34:12 +0000 | [diff] [blame^] | 43 | bool isBitSet(int index) const; |
vandebo@chromium.org | d3a8c94 | 2011-07-02 01:26:37 +0000 | [diff] [blame] | 44 | |
| 45 | /** Or bits from source. false is returned if this doesn't have the same |
| 46 | * bit count as source. |
| 47 | */ |
vandebo@chromium.org | 9859428 | 2011-07-25 22:34:12 +0000 | [diff] [blame^] | 48 | bool orBits(const SkBitSet& source); |
vandebo@chromium.org | d3a8c94 | 2011-07-02 01:26:37 +0000 | [diff] [blame] | 49 | |
| 50 | private: |
| 51 | SkAutoFree fBitData; |
| 52 | // Dword (32-bit) count of the bitset. |
| 53 | size_t fDwordCount; |
| 54 | size_t fBitCount; |
| 55 | |
vandebo@chromium.org | 9859428 | 2011-07-25 22:34:12 +0000 | [diff] [blame^] | 56 | uint32_t* internalGet(int index) const { |
vandebo@chromium.org | d3a8c94 | 2011-07-02 01:26:37 +0000 | [diff] [blame] | 57 | SkASSERT((size_t)index < fBitCount); |
| 58 | size_t internalIndex = index / 32; |
| 59 | SkASSERT(internalIndex < fDwordCount); |
| 60 | return (uint32_t*)fBitData.get() + internalIndex; |
| 61 | } |
| 62 | }; |
| 63 | |
| 64 | |
| 65 | #endif |