47 lines
1.3 KiB
C#
47 lines
1.3 KiB
C#
using System.Diagnostics;
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namespace DisplayCommands;
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public sealed class PixelGrid(ushort width, ushort height)
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{
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private readonly ByteGrid _byteGrid = new((ushort)(width / 8u), height);
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public ushort Width { get; } = width;
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public ushort Height { get; } = height;
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public Memory<byte> Data => _byteGrid.Data;
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public bool this[ushort x, ushort y]
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{
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get
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{
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Debug.Assert(y < Height);
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var (byteIndex, bitInByteMask) = GetIndexes(x);
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var byteVal = _byteGrid[byteIndex, y];
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return (byteVal & bitInByteMask) != 0;
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}
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set
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{
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Debug.Assert(y < Height);
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var (byteIndex, bitInByteMask) = GetIndexes(x);
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if (value)
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_byteGrid[byteIndex, y] |= bitInByteMask;
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else
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_byteGrid[byteIndex, y] &= (byte)(ushort.MaxValue ^ bitInByteMask);
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}
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}
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public void Clear() => _byteGrid.Clear();
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private (ushort byteIndex, byte bitInByteMask) GetIndexes(int x)
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{
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Debug.Assert(x < Width);
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var byteIndex = (ushort)(x / 8);
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Debug.Assert(byteIndex < Width);
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var bitInByteIndex = (byte)(7 - x % 8);
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Debug.Assert(bitInByteIndex < 8);
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var bitInByteMask = (byte)(1 << bitInByteIndex);
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return (byteIndex, bitInByteMask);
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}
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} |