Vertical64BitStrips.cs

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using System;
using System.Text;
 
namespace Terraria.Utilities;
 
public struct Vertical64BitStrips
{
    private Bits64[] arr;
 
    public Bits64 this[int x]
    {
        get
        {
            return arr[x];
        }
        set
        {
            arr[x] = value;
        }
    }
 
    public Vertical64BitStrips(int len)
    {
        arr = new Bits64[len];
    }
 
    public void Clear()
    {
        Array.Clear(arr, 0, arr.Length);
    }
 
    public void Expand3x3()
    {
        for (int i = 0; i < arr.Length - 1; i++)
        {
            ref Bits64 reference = ref arr[i];
            reference = (ulong)reference | (ulong)arr[i + 1];
        }
        for (int num = arr.Length - 1; num > 0; num--)
        {
            ref Bits64 reference2 = ref arr[num];
            reference2 = (ulong)reference2 | (ulong)arr[num - 1];
        }
        for (int j = 0; j < arr.Length; j++)
        {
            Bits64 bits = arr[j];
            arr[j] = ((ulong)bits << 1) | (ulong)bits | ((ulong)bits >> 1);
        }
    }
 
    public override string ToString()
    {
        StringBuilder stringBuilder = new StringBuilder(arr.Length * 65);
        for (int i = 0; i < 64; i++)
        {
            if (i > 0)
            {
                stringBuilder.Append('\n');
            }
            for (int j = 0; j < arr.Length; j++)
            {
                stringBuilder.Append(this[j][i] ? 'x' : ' ');
            }
        }
        return stringBuilder.ToString();
    }
}