60 lines
2 KiB
C#
60 lines
2 KiB
C#
using System.Diagnostics;
|
|
|
|
namespace DisplayCommands;
|
|
|
|
public sealed class PixelGrid(ushort width, ushort height) : IEquatable<PixelGrid>
|
|
{
|
|
private readonly ByteGrid _byteGrid = new((ushort)(width / 8u), height);
|
|
|
|
public ushort Width { get; } = width;
|
|
|
|
public ushort Height { get; } = height;
|
|
|
|
public Memory<byte> Data => _byteGrid.Data;
|
|
|
|
public bool this[ushort x, ushort y]
|
|
{
|
|
get
|
|
{
|
|
Debug.Assert(y < Height);
|
|
var (byteIndex, bitInByteMask) = GetIndexes(x);
|
|
var byteVal = _byteGrid[byteIndex, y];
|
|
return (byteVal & bitInByteMask) != 0;
|
|
}
|
|
set
|
|
{
|
|
Debug.Assert(y < Height);
|
|
var (byteIndex, bitInByteMask) = GetIndexes(x);
|
|
if (value)
|
|
_byteGrid[byteIndex, y] |= bitInByteMask;
|
|
else
|
|
_byteGrid[byteIndex, y] &= (byte)(ushort.MaxValue ^ bitInByteMask);
|
|
}
|
|
}
|
|
|
|
public void Clear() => _byteGrid.Clear();
|
|
|
|
public bool Equals(PixelGrid? other)
|
|
{
|
|
if (ReferenceEquals(null, other)) return false;
|
|
if (ReferenceEquals(this, other)) return true;
|
|
return Width == other.Width && Height == other.Height && _byteGrid.Equals(other._byteGrid);
|
|
}
|
|
|
|
public override bool Equals(object? obj) => ReferenceEquals(this, obj) || (obj is PixelGrid other && Equals(other));
|
|
public override int GetHashCode() => HashCode.Combine(_byteGrid, Width, Height);
|
|
public static bool operator ==(PixelGrid? left, PixelGrid? right) => Equals(left, right);
|
|
public static bool operator !=(PixelGrid? left, PixelGrid? right) => !Equals(left, right);
|
|
|
|
private (ushort byteIndex, byte bitInByteMask) GetIndexes(int x)
|
|
{
|
|
Debug.Assert(x < Width);
|
|
var byteIndex = (ushort)(x / 8);
|
|
Debug.Assert(byteIndex < Width);
|
|
var bitInByteIndex = (byte)(7 - x % 8);
|
|
Debug.Assert(bitInByteIndex < 8);
|
|
var bitInByteMask = (byte)(1 << bitInByteIndex);
|
|
return (byteIndex, bitInByteMask);
|
|
}
|
|
}
|