rjx-mirror/Ryujinx.Graphics/Gal/Texture/BitArrayStream.cs
Ac_K aeb1bbf50c Add an ASTC Decoder (Not currently used in Ryujinx) (#131)
* Add an ASTC Decoder (Not currently used in Ryujinx)

* Update ASTCDecoder.cs
2018-06-01 15:00:16 -03:00

120 lines
3.2 KiB
C#

using System;
using System.Collections;
namespace Ryujinx.Graphics.Gal.Texture
{
public class BitArrayStream
{
public BitArray BitsArray;
public int Position { get; private set; }
public BitArrayStream(BitArray BitArray)
{
BitsArray = BitArray;
Position = 0;
}
public short ReadBits(int Length)
{
int RetValue = 0;
for (int i = Position; i < Position + Length; i++)
{
if (BitsArray[i])
{
RetValue |= 1 << (i - Position);
}
}
Position += Length;
return (short)RetValue;
}
public int ReadBits(int Start, int End)
{
int RetValue = 0;
for (int i = Start; i <= End; i++)
{
if (BitsArray[i])
{
RetValue |= 1 << (i - Start);
}
}
return RetValue;
}
public int ReadBit(int Index)
{
return Convert.ToInt32(BitsArray[Index]);
}
public void WriteBits(int Value, int Length)
{
for (int i = Position; i < Position + Length; i++)
{
BitsArray[i] = ((Value >> (i - Position)) & 1) != 0;
}
Position += Length;
}
public byte[] ToByteArray()
{
byte[] RetArray = new byte[(BitsArray.Length + 7) / 8];
BitsArray.CopyTo(RetArray, 0);
return RetArray;
}
public static int Replicate(int Value, int NumberBits, int ToBit)
{
if (NumberBits == 0) return 0;
if (ToBit == 0) return 0;
int TempValue = Value & ((1 << NumberBits) - 1);
int RetValue = TempValue;
int ResLength = NumberBits;
while (ResLength < ToBit)
{
int Comp = 0;
if (NumberBits > ToBit - ResLength)
{
int NewShift = ToBit - ResLength;
Comp = NumberBits - NewShift;
NumberBits = NewShift;
}
RetValue <<= NumberBits;
RetValue |= TempValue >> Comp;
ResLength += NumberBits;
}
return RetValue;
}
public static int PopCnt(int Number)
{
int Counter;
for (Counter = 0; Number != 0; Counter++)
{
Number &= Number - 1;
}
return Counter;
}
public static void Swap<T>(ref T lhs, ref T rhs)
{
T Temp = lhs;
lhs = rhs;
rhs = Temp;
}
// Transfers a bit as described in C.2.14
public static void BitTransferSigned(ref int a, ref int b)
{
b >>= 1;
b |= a & 0x80;
a >>= 1;
a &= 0x3F;
if ((a & 0x20) != 0) a -= 0x40;
}
}
}