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using System;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Runtime.CompilerServices;
namespace ARMeilleure.Common
{
unsafe class BitMap : IEnumerable<int>, IDisposable
{
private const int IntSize = 64;
private const int IntMask = IntSize - 1;
private int _count;
private long* _masks;
private readonly Allocator _allocator;
public BitMap(Allocator allocator)
{
_allocator = allocator;
}
public BitMap(Allocator allocator, int capacity) : this(allocator)
{
EnsureCapacity(capacity);
}
public bool Set(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
if ((_masks[wordIndex] & wordMask) != 0)
{
return false;
}
_masks[wordIndex] |= wordMask;
return true;
}
public void Clear(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
long wordMask = 1L << wordBit;
_masks[wordIndex] &= ~wordMask;
}
public bool IsSet(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
return (_masks[wordIndex] & (1L << wordBit)) != 0;
}
public int FindFirstUnset()
{
for (int index = 0; index < _count; index++)
{
long mask = _masks[index];
if (mask != -1L)
{
return BitOperations.TrailingZeroCount(~mask) + index * IntSize;
}
}
return _count * IntSize;
}
public bool Set(BitMap map)
{
EnsureCapacity(map._count * IntSize);
bool modified = false;
for (int index = 0; index < _count; index++)
{
long newValue = _masks[index] | map._masks[index];
if (_masks[index] != newValue)
{
_masks[index] = newValue;
modified = true;
}
}
return modified;
}
public bool Clear(BitMap map)
{
EnsureCapacity(map._count * IntSize);
bool modified = false;
for (int index = 0; index < _count; index++)
{
long newValue = _masks[index] & ~map._masks[index];
if (_masks[index] != newValue)
{
_masks[index] = newValue;
modified = true;
}
}
return modified;
}
private void EnsureCapacity(int size)
{
int count = (size + IntMask) / IntSize;
if (count > _count)
{
var oldMask = _masks;
var oldSpan = new Span<long>(_masks, _count);
_masks = _allocator.Allocate<long>((uint)count);
_count = count;
var newSpan = new Span<long>(_masks, _count);
oldSpan.CopyTo(newSpan);
newSpan.Slice(oldSpan.Length).Clear();
_allocator.Free(oldMask);
}
}
public void Dispose()
{
if (_masks != null)
{
_allocator.Free(_masks);
_masks = null;
}
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
IEnumerator<int> IEnumerable<int>.GetEnumerator()
{
return GetEnumerator();
}
public Enumerator GetEnumerator()
{
return new Enumerator(this);
}
public struct Enumerator : IEnumerator<int>
{
private long _index;
private long _mask;
private int _bit;
private readonly BitMap _map;
public int Current => (int)_index * IntSize + _bit;
object IEnumerator.Current => Current;
public Enumerator(BitMap map)
{
_index = -1;
_mask = 0;
_bit = 0;
_map = map;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool MoveNext()
{
if (_mask != 0)
{
_mask &= ~(1L << _bit);
}
// Manually hoist these loads, because RyuJIT does not.
long count = (uint)_map._count;
long* masks = _map._masks;
while (_mask == 0)
{
if (++_index >= count)
{
return false;
}
_mask = masks[_index];
}
_bit = BitOperations.TrailingZeroCount(_mask);
return true;
}
public void Reset() { }
public void Dispose() { }
}
}
}
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