Remove packed field

src/ImageSharp/Formats/Gif/PackedField.cs

@@ -1,115 +0,0 @@
-// Copyright (c) Six Labors and contributors.
-// Licensed under the Apache License, Version 2.0.
-
-using System;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-
-namespace SixLabors.ImageSharp.Formats.Gif
-{
-    /// <summary>
-    /// Represents a byte of data in a GIF data stream which contains a number
-    /// of data items.
-    /// </summary>
-    internal readonly struct PackedField
-    {
-        /// <summary>
-        /// The individual bits representing the packed byte.
-        /// </summary>
-        private static readonly bool[] Bits = new bool[8];
-
-        /// <summary>
-        /// Gets the byte which represents the data items held in this instance.
-        /// </summary>
-        public byte Byte
-        {
-            [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get
-            {
-                int returnValue = 0;
-                int bitShift = 7;
-                foreach (bool bit in Bits)
-                {
-                    int bitValue;
-                    if (bit)
-                    {
-                        bitValue = 1 << bitShift;
-                    }
-                    else
-                    {
-                        bitValue = 0;
-                    }
-
-                    returnValue |= bitValue;
-                    bitShift--;
-                }
-
-                return Convert.ToByte(returnValue & 0xFF);
-            }
-        }
-
-        /// <summary>
-        /// Sets the specified bit within the packed fields to the supplied
-        /// value.
-        /// </summary>
-        /// <param name="index">
-        /// The zero-based index within the packed fields of the bit to set.
-        /// </param>
-        /// <param name="valueToSet">
-        /// The value to set the bit to.
-        /// </param>
-        public void SetBit(int index, bool valueToSet)
-        {
-            DebugGuard.MustBeBetweenOrEqualTo(index, 0, 7, nameof(index));
-            Bits[index] = valueToSet;
-        }
-
-        /// <summary>
-        /// Sets the specified bits within the packed fields to the supplied
-        /// value.
-        /// </summary>
-        /// <param name="startIndex">The zero-based index within the packed fields of the first bit to  set.</param>
-        /// <param name="length">The number of bits to set.</param>
-        /// <param name="valueToSet">The value to set the bits to.</param>
-        public void SetBits(int startIndex, int length, int valueToSet)
-        {
-            DebugGuard.MustBeBetweenOrEqualTo(startIndex, 0, 7, nameof(startIndex));
-            DebugCheckLength(startIndex, length);
-
-            int bitShift = length - 1;
-            for (int i = startIndex; i < startIndex + length; i++)
-            {
-                int bitValueIfSet = 1 << bitShift;
-                int bitValue = valueToSet & bitValueIfSet;
-                int bitIsSet = bitValue >> bitShift;
-                Bits[i] = bitIsSet == 1;
-                bitShift--;
-            }
-        }
-
-        /// <summary>
-        /// Gets the value of the specified bit within the byte.
-        /// </summary>
-        /// <param name="index">The zero-based index of the bit to get.</param>
-        /// <returns>
-        /// The value of the specified bit within the byte.
-        /// </returns>
-        public bool GetBit(int index)
-        {
-            DebugGuard.MustBeBetweenOrEqualTo(index, 0, 7, nameof(index));
-            return Bits[index];
-        }
-
-        [Conditional("DEBUG")]
-        private static void DebugCheckLength(int startIndex, int length)
-        {
-            if (length < 1 || startIndex + length > 8)
-            {
-                string message = "Length must be greater than zero and the sum of length and start index must be less than 8. "
-                                 + $"Supplied length: {length}. Supplied start index: {startIndex}";
-
-                throw new ArgumentOutOfRangeException(nameof(length), message);
-            }
-        }
-    }
-}