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/*
* Copyright (C) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkBitSet_DEFINED
#define SkBitSet_DEFINED
#include "SkTypes.h"
#include "SkTDArray.h"
class SkBitSet {
public:
/** NumberOfBits must be greater than zero.
*/
explicit SkBitSet(int numberOfBits);
explicit SkBitSet(const SkBitSet& source);
const SkBitSet& operator=(const SkBitSet& rhs);
bool operator==(const SkBitSet& rhs);
bool operator!=(const SkBitSet& rhs);
/** Clear all data.
*/
void clearAll();
/** Set the value of the index-th bit.
*/
void setBit(int index, bool value);
/** Test if bit index is set.
*/
bool isBitSet(int index) const;
/** Or bits from source. false is returned if this doesn't have the same
* bit count as source.
*/
bool orBits(const SkBitSet& source);
/** Export set bits to unsigned int array. (used in font subsetting)
*/
void exportTo(SkTDArray<uint32_t>* array) const;
private:
SkAutoFree fBitData;
// Dword (32-bit) count of the bitset.
size_t fDwordCount;
size_t fBitCount;
uint32_t* internalGet(int index) const {
SkASSERT((size_t)index < fBitCount);
size_t internalIndex = index / 32;
SkASSERT(internalIndex < fDwordCount);
return (uint32_t*)fBitData.get() + internalIndex;
}
};
#endif
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