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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitSet.h"
SkBitSet::SkBitSet(int numberOfBits)
: fBitData(NULL), fDwordCount(0), fBitCount(numberOfBits) {
SkASSERT(numberOfBits > 0);
// Round up size to 32-bit boundary.
fDwordCount = (numberOfBits + 31) / 32;
fBitData.set(malloc(fDwordCount * sizeof(uint32_t)));
clearAll();
}
SkBitSet::SkBitSet(const SkBitSet& source)
: fBitData(NULL), fDwordCount(0), fBitCount(0) {
*this = source;
}
const SkBitSet& SkBitSet::operator=(const SkBitSet& rhs) {
if (this == &rhs) {
return *this;
}
fBitCount = rhs.fBitCount;
fBitData.free();
fDwordCount = rhs.fDwordCount;
fBitData.set(malloc(fDwordCount * sizeof(uint32_t)));
memcpy(fBitData.get(), rhs.fBitData.get(), fDwordCount * sizeof(uint32_t));
return *this;
}
bool SkBitSet::operator==(const SkBitSet& rhs) {
if (fBitCount == rhs.fBitCount) {
if (fBitData.get() != NULL) {
return (memcmp(fBitData.get(), rhs.fBitData.get(),
fDwordCount * sizeof(uint32_t)) == 0);
}
return true;
}
return false;
}
bool SkBitSet::operator!=(const SkBitSet& rhs) {
return !(*this == rhs);
}
void SkBitSet::clearAll() {
if (fBitData.get() != NULL) {
sk_bzero(fBitData.get(), fDwordCount * sizeof(uint32_t));
}
}
void SkBitSet::setBit(int index, bool value) {
uint32_t mask = 1 << (index % 32);
if (value) {
*(internalGet(index)) |= mask;
} else {
*(internalGet(index)) &= ~mask;
}
}
bool SkBitSet::isBitSet(int index) const {
uint32_t mask = 1 << (index % 32);
return 0 != (*internalGet(index) & mask);
}
bool SkBitSet::orBits(const SkBitSet& source) {
if (fBitCount != source.fBitCount) {
return false;
}
uint32_t* targetBitmap = internalGet(0);
uint32_t* sourceBitmap = source.internalGet(0);
for (size_t i = 0; i < fDwordCount; ++i) {
targetBitmap[i] |= sourceBitmap[i];
}
return true;
}
void SkBitSet::exportTo(SkTDArray<uint32_t>* array) const {
SkASSERT(array);
uint32_t* data = reinterpret_cast<uint32_t*>(fBitData.get());
for (unsigned int i = 0; i < fDwordCount; ++i) {
uint32_t value = data[i];
if (value) { // There are set bits
unsigned int index = i * 32;
for (unsigned int j = 0; j < 32; ++j) {
if (0x1 & (value >> j)) {
array->push(index + j);
}
}
}
}
}
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