Removes usage of linq in several critical paths (#918)

* Remove linq usage from jpeg + formatting

* png

* ICC + formattiing

* Resize

* Fix base class comparison.

src/ImageSharp/Formats/Jpeg/Components/Decoder/ProfileResolver.cs

@@ -12,17 +12,17 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder
     internal static class ProfileResolver
     {
         /// <summary>
-        /// Describes the EXIF specific markers.
+        /// Describes the JFIF specific markers.
         /// </summary>
         public static readonly byte[] JFifMarker = Encoding.ASCII.GetBytes("JFIF\0");
 
         /// <summary>
-        /// Describes the EXIF specific markers.
+        /// Describes the ICC specific markers.
         /// </summary>
         public static readonly byte[] IccMarker = Encoding.ASCII.GetBytes("ICC_PROFILE\0");
 
         /// <summary>
-        /// Describes the ICC specific markers.
+        /// Describes the EXIF specific markers.
         /// </summary>
         public static readonly byte[] ExifMarker = Encoding.ASCII.GetBytes("Exif\0\0");
 
@@ -36,7 +36,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components.Decoder
         /// </summary>
         /// <param name="bytesToCheck">The bytes to check.</param>
         /// <param name="profileIdentifier">The profile identifier.</param>
-        /// <returns>The <see cref="bool"/></returns>
+        /// <returns>The <see cref="bool"/>.</returns>
         public static bool IsProfile(ReadOnlySpan<byte> bytesToCheck, ReadOnlySpan<byte> profileIdentifier)
         {
             return bytesToCheck.Length >= profileIdentifier.Length

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Buffers.Binary;
 using System.IO;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Common.Helpers;
@@ -726,7 +725,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             this.InputStream.Read(this.temp, 0, length);
 
             // We only support 8-bit and 12-bit precision.
-            if (!this.supportedPrecisions.Contains(this.temp[0]))
+            if (Array.IndexOf(this.supportedPrecisions, this.temp[0]) == -1)
             {
                 JpegThrowHelper.ThrowImageFormatException("Only 8-Bit and 12-Bit precision supported.");
             }

src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Buffers.Binary;
 using System.IO;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using SixLabors.ImageSharp.Common.Helpers;
 using SixLabors.ImageSharp.Formats.Jpeg.Components;
@@ -197,7 +196,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             Guard.NotNull(image, nameof(image));
             Guard.NotNull(stream, nameof(stream));
 
-            ushort max = JpegConstants.MaxLength;
+            const ushort max = JpegConstants.MaxLength;
             if (image.Width >= max || image.Height >= max)
             {
                 throw new ImageFormatException($"Image is too large to encode at {image.Width}x{image.Height}.");
@@ -226,7 +225,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
             InitQuantizationTable(1, scale, ref this.chrominanceQuantTable);
 
             // Compute number of components based on input image type.
-            int componentCount = 3;
+            const int componentCount = 3;
 
             // Write the Start Of Image marker.
             this.WriteApplicationHeader(metadata);
@@ -278,7 +277,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
         private static void InitQuantizationTable(int i, int scale, ref Block8x8F quant)
         {
             DebugGuard.MustBeBetweenOrEqualTo(i, 0, 1, nameof(i));
-            var unscaledQuant = (i == 0) ? UnscaledQuant_Luminance : UnscaledQuant_Chrominance;
+            ReadOnlySpan<byte> unscaledQuant = (i == 0) ? UnscaledQuant_Luminance : UnscaledQuant_Chrominance;
 
             for (int j = 0; j < Block8x8F.Size; j++)
             {
@@ -653,8 +652,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 return;
             }
 
-            const int MaxBytesApp1 = 65533;
-            const int MaxBytesWithExifId = 65527;
+            const int MaxBytesApp1 = 65533; // 64k - 2 padding bytes
+            const int MaxBytesWithExifId = 65527; // Max - 6 bytes for EXIF header.
 
             byte[] data = exifProfile?.ToByteArray();
 
@@ -663,31 +662,30 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                 return;
             }
 
-            data = ProfileResolver.ExifMarker.Concat(data).ToArray();
-
-            int remaining = data.Length;
+            // We can write up to a maximum of 64 data to the initial marker so calculate boundaries.
+            int exifMarkerLength = ProfileResolver.ExifMarker.Length;
+            int remaining = exifMarkerLength + data.Length;
             int bytesToWrite = remaining > MaxBytesApp1 ? MaxBytesApp1 : remaining;
             int app1Length = bytesToWrite + 2;
 
+            // Write the app marker, EXIF marker, and data
             this.WriteApp1Header(app1Length);
-
-            // write the exif data
-            this.outputStream.Write(data, 0, bytesToWrite);
+            this.outputStream.Write(ProfileResolver.ExifMarker);
+            this.outputStream.Write(data, 0, bytesToWrite - exifMarkerLength);
             remaining -= bytesToWrite;
 
-            // if the exif data exceeds 64K, write it in multiple APP1 Markers
-            for (int idx = MaxBytesApp1; idx < data.Length; idx += MaxBytesWithExifId)
+            // If the exif data exceeds 64K, write it in multiple APP1 Markers
+            for (int idx = MaxBytesWithExifId; idx < data.Length; idx += MaxBytesWithExifId)
             {
                 bytesToWrite = remaining > MaxBytesWithExifId ? MaxBytesWithExifId : remaining;
-                app1Length = bytesToWrite + 2 + 6;
+                app1Length = bytesToWrite + 2 + exifMarkerLength;
 
                 this.WriteApp1Header(app1Length);
 
-                // write Exif00 marker
-                ProfileResolver.ExifMarker.AsSpan().CopyTo(this.buffer.AsSpan());
-                this.outputStream.Write(this.buffer, 0, 6);
+                // Write Exif00 marker
+                this.outputStream.Write(ProfileResolver.ExifMarker);
 
-                // write the exif data
+                // Write the exif data
                 this.outputStream.Write(data, idx, bytesToWrite);
 
                 remaining -= bytesToWrite;

src/ImageSharp/Formats/Png/PngEncoderCore.cs

@@ -6,7 +6,6 @@ using System.Buffers;
 using System.Buffers.Binary;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Advanced;
@@ -231,7 +230,7 @@ namespace SixLabors.ImageSharp.Formats.Png
             if (this.pngColorType == PngColorType.Palette)
             {
                 byte bits = (byte)this.pngBitDepth;
-                if (!ColorTypes[this.pngColorType.Value].Contains(bits))
+                if (Array.IndexOf(ColorTypes[this.pngColorType.Value], bits) == -1)
                 {
                     throw new NotSupportedException("Bit depth is not supported or not valid.");
                 }
@@ -268,7 +267,7 @@ namespace SixLabors.ImageSharp.Formats.Png
             else
             {
                 this.bitDepth = (byte)this.pngBitDepth;
-                if (!ColorTypes[this.pngColorType.Value].Contains(this.bitDepth))
+                if (Array.IndexOf(ColorTypes[this.pngColorType.Value], this.bitDepth) == -1)
                 {
                     throw new NotSupportedException("Bit depth is not supported or not valid.");
                 }

src/ImageSharp/MetaData/Profiles/ICC/Curves/IccOneDimensionalCurve.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -52,7 +51,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             }
 
             return this.BreakPoints.AsSpan().SequenceEqual(other.BreakPoints)
-                && this.Segments.SequenceEqual(other.Segments);
+                && this.Segments.AsSpan().SequenceEqual(other.Segments);
         }
     }
 }

src/ImageSharp/MetaData/Profiles/ICC/Curves/IccResponseCurve.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 using System.Numerics;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
@@ -65,10 +64,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         }
 
         /// <inheritdoc />
-        public override bool Equals(object obj)
-        {
-            return obj is IccResponseCurve other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccResponseCurve other && this.Equals(other);
 
         /// <inheritdoc />
         public override int GetHashCode()
@@ -88,7 +84,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
             for (int i = 0; i < this.ResponseArrays.Length; i++)
             {
-                if (!this.ResponseArrays[i].SequenceEqual(other.ResponseArrays[i]))
+                if (!this.ResponseArrays[i].AsSpan().SequenceEqual(other.ResponseArrays[i]))
                 {
                     return false;
                 }

src/ImageSharp/MetaData/Profiles/ICC/DataWriter/IccDataWriter.TagDataEntry.cs

@@ -163,10 +163,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteUnknownTagDataEntry(IccUnknownTagDataEntry value)
-        {
-            return this.WriteArray(value.Data);
-        }
+        public int WriteUnknownTagDataEntry(IccUnknownTagDataEntry value) => this.WriteArray(value.Data);
 
         /// <summary>
         /// Writes a <see cref="IccChromaticityTagDataEntry"/>
@@ -269,10 +266,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteDateTimeTagDataEntry(IccDateTimeTagDataEntry value)
-        {
-            return this.WriteDateTime(value.Value);
-        }
+        public int WriteDateTimeTagDataEntry(IccDateTimeTagDataEntry value) => this.WriteDateTime(value.Value);
 
         /// <summary>
         /// Writes a <see cref="IccLut16TagDataEntry"/>
@@ -563,6 +557,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             long tpos = this.dataStream.Position;
             this.dataStream.Position += cultureCount * 12;
 
+            // TODO: Investigate cost of Linq GroupBy
             IGrouping<string, IccLocalizedString>[] texts = value.Texts.GroupBy(t => t.Text).ToArray();
 
             uint[] offset = new uint[texts.Length];
@@ -625,7 +620,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             long tpos = this.dataStream.Position;
             this.dataStream.Position += value.Data.Length * 8;
 
-            IccPositionNumber[] posTable = new IccPositionNumber[value.Data.Length];
+            var posTable = new IccPositionNumber[value.Data.Length];
             for (int i = 0; i < value.Data.Length; i++)
             {
                 uint offset = (uint)(this.dataStream.Position - start);
@@ -673,10 +668,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteParametricCurveTagDataEntry(IccParametricCurveTagDataEntry value)
-        {
-            return this.WriteParametricCurve(value.Curve);
-        }
+        public int WriteParametricCurveTagDataEntry(IccParametricCurveTagDataEntry value) => this.WriteParametricCurve(value.Curve);
 
         /// <summary>
         /// Writes a <see cref="IccProfileSequenceDescTagDataEntry"/>
@@ -793,20 +785,14 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteSignatureTagDataEntry(IccSignatureTagDataEntry value)
-        {
-            return this.WriteAsciiString(value.SignatureData, 4, false);
-        }
+        public int WriteSignatureTagDataEntry(IccSignatureTagDataEntry value) => this.WriteAsciiString(value.SignatureData, 4, false);
 
         /// <summary>
         /// Writes a <see cref="IccTextTagDataEntry"/>
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteTextTagDataEntry(IccTextTagDataEntry value)
-        {
-            return this.WriteAsciiString(value.Text);
-        }
+        public int WriteTextTagDataEntry(IccTextTagDataEntry value) => this.WriteAsciiString(value.Text);
 
         /// <summary>
         /// Writes a <see cref="IccUFix16ArrayTagDataEntry"/>
@@ -829,40 +815,28 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteUInt16ArrayTagDataEntry(IccUInt16ArrayTagDataEntry value)
-        {
-            return this.WriteArray(value.Data);
-        }
+        public int WriteUInt16ArrayTagDataEntry(IccUInt16ArrayTagDataEntry value) => this.WriteArray(value.Data);
 
         /// <summary>
         /// Writes a <see cref="IccUInt32ArrayTagDataEntry"/>
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteUInt32ArrayTagDataEntry(IccUInt32ArrayTagDataEntry value)
-        {
-            return this.WriteArray(value.Data);
-        }
+        public int WriteUInt32ArrayTagDataEntry(IccUInt32ArrayTagDataEntry value) => this.WriteArray(value.Data);
 
         /// <summary>
         /// Writes a <see cref="IccUInt64ArrayTagDataEntry"/>
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteUInt64ArrayTagDataEntry(IccUInt64ArrayTagDataEntry value)
-        {
-            return this.WriteArray(value.Data);
-        }
+        public int WriteUInt64ArrayTagDataEntry(IccUInt64ArrayTagDataEntry value) => this.WriteArray(value.Data);
 
         /// <summary>
         /// Writes a <see cref="IccUInt8ArrayTagDataEntry"/>
         /// </summary>
         /// <param name="value">The entry to write</param>
         /// <returns>The number of bytes written</returns>
-        public int WriteUInt8ArrayTagDataEntry(IccUInt8ArrayTagDataEntry value)
-        {
-            return this.WriteArray(value.Data);
-        }
+        public int WriteUInt8ArrayTagDataEntry(IccUInt8ArrayTagDataEntry value) => this.WriteArray(value.Data);
 
         /// <summary>
         /// Writes a <see cref="IccViewingConditionsTagDataEntry"/>

src/ImageSharp/MetaData/Profiles/ICC/IccWriter.cs

@@ -70,6 +70,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
         private IccTagTableEntry[] WriteTagData(IccDataWriter writer, IccTagDataEntry[] entries)
         {
+            // TODO: Investigate cost of Linq GroupBy
             IEnumerable<IGrouping<IccTagDataEntry, IccTagDataEntry>> grouped = entries.GroupBy(t => t);
 
             // (Header size) + (entry count) + (nr of entries) * (size of table entry)

src/ImageSharp/MetaData/Profiles/ICC/MultiProcessElements/IccCurveSetProcessElement.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -17,9 +16,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <param name="curves">An array with one dimensional curves</param>
         public IccCurveSetProcessElement(IccOneDimensionalCurve[] curves)
             : base(IccMultiProcessElementSignature.CurveSet, curves?.Length ?? 1, curves?.Length ?? 1)
-        {
-            this.Curves = curves ?? throw new ArgumentNullException(nameof(curves));
-        }
+            => this.Curves = curves ?? throw new ArgumentNullException(nameof(curves));
 
         /// <summary>
         /// Gets an array of one dimensional curves
@@ -31,16 +28,13 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         {
             if (base.Equals(other) && other is IccCurveSetProcessElement element)
             {
-                return this.Curves.SequenceEqual(element.Curves);
+                return this.Curves.AsSpan().SequenceEqual(element.Curves);
             }
 
             return false;
         }
 
         /// <inheritdoc />
-        public bool Equals(IccCurveSetProcessElement other)
-        {
-            return this.Equals((IccMultiProcessElement)other);
-        }
+        public bool Equals(IccCurveSetProcessElement other) => this.Equals((IccMultiProcessElement)other);
     }
 }

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccChromaticityTagDataEntry.cs

@@ -80,10 +80,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public double[][] ChannelValues { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccChromaticityTagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccChromaticityTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccChromaticityTagDataEntry other)
@@ -102,10 +99,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccChromaticityTagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccChromaticityTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()
@@ -162,7 +156,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
             for (int i = 0; i < this.ChannelValues.Length; i++)
             {
-                if (!this.ChannelValues[i].SequenceEqual(entry.ChannelValues[i]))
+                if (!this.ChannelValues[i].AsSpan().SequenceEqual(entry.ChannelValues[i]))
                 {
                     return false;
                 }

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccColorantTableTagDataEntry.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -42,10 +41,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccColorantTableEntry[] ColorantData { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccColorantTableTagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccColorantTableTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccColorantTableTagDataEntry other)
@@ -60,19 +56,13 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 return true;
             }
 
-            return base.Equals(other) && this.ColorantData.SequenceEqual(other.ColorantData);
+            return base.Equals(other) && this.ColorantData.AsSpan().SequenceEqual(other.ColorantData);
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccColorantTableTagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccColorantTableTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
-        public override int GetHashCode()
-        {
-            return HashCode.Combine(this.Signature, this.ColorantData);
-        }
+        public override int GetHashCode() => HashCode.Combine(this.Signature, this.ColorantData);
     }
 }

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccLut16TagDataEntry.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 using System.Numerics;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
@@ -71,7 +70,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             bool is3By3 = matrix.GetLength(0) == 3 && matrix.GetLength(1) == 3;
             Guard.IsTrue(is3By3, nameof(matrix), "Matrix must have a size of three by three");
 
-            this.Matrix = this.CreateMatrix(matrix);
+            this.Matrix = CreateMatrix(matrix);
             this.InputValues = inputValues ?? throw new ArgumentNullException(nameof(inputValues));
             this.ClutValues = clutValues ?? throw new ArgumentNullException(nameof(clutValues));
             this.OutputValues = outputValues ?? throw new ArgumentNullException(nameof(outputValues));
@@ -111,10 +110,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccLut[] OutputValues { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccLut16TagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccLut16TagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccLut16TagDataEntry other)
@@ -131,16 +127,13 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
             return base.Equals(other)
                 && this.Matrix.Equals(other.Matrix)
-                && this.InputValues.SequenceEqual(other.InputValues)
+                && this.InputValues.AsSpan().SequenceEqual(other.InputValues)
                 && this.ClutValues.Equals(other.ClutValues)
-                && this.OutputValues.SequenceEqual(other.OutputValues);
+                && this.OutputValues.AsSpan().SequenceEqual(other.OutputValues);
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccLut16TagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccLut16TagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()
@@ -153,7 +146,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 this.OutputValues);
         }
 
-        private Matrix4x4 CreateMatrix(float[,] matrix)
+        private static Matrix4x4 CreateMatrix(float[,] matrix)
         {
             return new Matrix4x4(
                 matrix[0, 0],

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccLut8TagDataEntry.cs

@@ -114,10 +114,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccLut[] OutputValues { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccLut8TagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccLut8TagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccLut8TagDataEntry other)
@@ -134,16 +131,13 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
             return base.Equals(other)
                 && this.Matrix.Equals(other.Matrix)
-                && this.InputValues.SequenceEqual(other.InputValues)
+                && this.InputValues.AsSpan().SequenceEqual(other.InputValues)
                 && this.ClutValues.Equals(other.ClutValues)
-                && this.OutputValues.SequenceEqual(other.OutputValues);
+                && this.OutputValues.AsSpan().SequenceEqual(other.OutputValues);
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccLut8TagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccLut8TagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccLutAToBTagDataEntry.cs

@@ -5,6 +5,7 @@ using System;
 using System.Linq;
 using System.Numerics;
 
+// TODO: Review the use of base IccTagDataEntry comparison.
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
     /// <summary>
@@ -15,12 +16,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <summary>
         /// Initializes a new instance of the <see cref="IccLutAToBTagDataEntry"/> class.
         /// </summary>
-        /// <param name="curveA">A Curve</param>
-        /// <param name="clutValues">CLUT</param>
-        /// <param name="curveM">M Curve</param>
+        /// <param name="curveB">B Curve</param>
         /// <param name="matrix3x3">Two dimensional conversion matrix (3x3)</param>
         /// <param name="matrix3x1">One dimensional conversion matrix (3x1)</param>
-        /// <param name="curveB">B Curve</param>
+        /// <param name="curveM">M Curve</param>
+        /// <param name="clutValues">CLUT</param>
+        /// <param name="curveA">A Curve</param>
         public IccLutAToBTagDataEntry(
             IccTagDataEntry[] curveB,
             float[,] matrix3x3,
@@ -35,12 +36,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <summary>
         /// Initializes a new instance of the <see cref="IccLutAToBTagDataEntry"/> class.
         /// </summary>
-        /// <param name="curveA">A Curve</param>
-        /// <param name="clutValues">CLUT</param>
-        /// <param name="curveM">M Curve</param>
+        /// <param name="curveB">B Curve</param>
         /// <param name="matrix3x3">Two dimensional conversion matrix (3x3)</param>
         /// <param name="matrix3x1">One dimensional conversion matrix (3x1)</param>
-        /// <param name="curveB">B Curve</param>
+        /// <param name="curveM">M Curve</param>
+        /// <param name="clutValues">CLUT</param>
+        /// <param name="curveA">A Curve</param>
         /// <param name="tagSignature">Tag Signature</param>
         public IccLutAToBTagDataEntry(
             IccTagDataEntry[] curveB,
@@ -145,10 +146,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccTagDataEntry[] CurveA { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccLutAToBTagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccLutAToBTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccLutAToBTagDataEntry other)
@@ -169,23 +167,18 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 && this.Matrix3x3.Equals(other.Matrix3x3)
                 && this.Matrix3x1.Equals(other.Matrix3x1)
                 && this.ClutValues.Equals(other.ClutValues)
-                && this.EqualsCurve(this.CurveB, other.CurveB)
-                && this.EqualsCurve(this.CurveM, other.CurveM)
-                && this.EqualsCurve(this.CurveA, other.CurveA);
+                && EqualsCurve(this.CurveB, other.CurveB)
+                && EqualsCurve(this.CurveM, other.CurveM)
+                && EqualsCurve(this.CurveA, other.CurveA);
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccLutAToBTagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccLutAToBTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()
         {
-#pragma warning disable SA1129 // Do not use default value type constructor
-            var hashCode = new HashCode();
-#pragma warning restore SA1129 // Do not use default value type constructor
+            HashCode hashCode = default;
 
             hashCode.Add(this.Signature);
             hashCode.Add(this.InputChannelCount);
@@ -200,7 +193,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             return hashCode.ToHashCode();
         }
 
-        private bool EqualsCurve(IccTagDataEntry[] thisCurves, IccTagDataEntry[] entryCurves)
+        private static bool EqualsCurve(IccTagDataEntry[] thisCurves, IccTagDataEntry[] entryCurves)
         {
             bool thisNull = thisCurves is null;
             bool entryNull = entryCurves is null;
@@ -243,10 +236,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 && this.CurveA != null;
         }
 
-        private bool IsB()
-        {
-            return this.CurveB != null;
-        }
+        private bool IsB() => this.CurveB != null;
 
         private void VerifyCurve(IccTagDataEntry[] curves, string name)
         {

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccLutBToATagDataEntry.cs

@@ -5,6 +5,7 @@ using System;
 using System.Linq;
 using System.Numerics;
 
+// TODO: Review the use of base IccTagDataEntry comparison.
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
     /// <summary>
@@ -15,12 +16,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <summary>
         /// Initializes a new instance of the <see cref="IccLutBToATagDataEntry"/> class.
         /// </summary>
-        /// <param name="curveA">A Curve</param>
-        /// <param name="clutValues">CLUT</param>
-        /// <param name="curveM">M Curve</param>
+        /// <param name="curveB">B Curve</param>
         /// <param name="matrix3x3">Two dimensional conversion matrix (3x3)</param>
         /// <param name="matrix3x1">One dimensional conversion matrix (3x1)</param>
-        /// <param name="curveB">B Curve</param>
+        /// <param name="curveM">M Curve</param>
+        /// <param name="clutValues">CLUT</param>
+        /// <param name="curveA">A Curve</param>
         public IccLutBToATagDataEntry(
             IccTagDataEntry[] curveB,
             float[,] matrix3x3,
@@ -35,12 +36,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <summary>
         /// Initializes a new instance of the <see cref="IccLutBToATagDataEntry"/> class.
         /// </summary>
-        /// <param name="curveA">A Curve</param>
-        /// <param name="clutValues">CLUT</param>
-        /// <param name="curveM">M Curve</param>
+        /// <param name="curveB">B Curve</param>
         /// <param name="matrix3x3">Two dimensional conversion matrix (3x3)</param>
         /// <param name="matrix3x1">One dimensional conversion matrix (3x1)</param>
-        /// <param name="curveB">B Curve</param>
+        /// <param name="curveM">M Curve</param>
+        /// <param name="clutValues">CLUT</param>
+        /// <param name="curveA">A Curve</param>
         /// <param name="tagSignature">Tag Signature</param>
         public IccLutBToATagDataEntry(
             IccTagDataEntry[] curveB,
@@ -145,10 +146,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccTagDataEntry[] CurveA { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccLutBToATagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccLutBToATagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccLutBToATagDataEntry other)
@@ -175,18 +173,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccLutBToATagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccLutBToATagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()
         {
-#pragma warning disable SA1129 // Do not use default value type constructor
-            var hashCode = new HashCode();
-#pragma warning restore SA1129 // Do not use default value type constructor
-
+            HashCode hashCode = default;
             hashCode.Add(this.Signature);
             hashCode.Add(this.InputChannelCount);
             hashCode.Add(this.OutputChannelCount);
@@ -243,10 +235,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 && this.CurveA != null;
         }
 
-        private bool IsB()
-        {
-            return this.CurveB != null;
-        }
+        private bool IsB() => this.CurveB != null;
 
         private void VerifyCurve(IccTagDataEntry[] curves, string name)
         {

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccMultiLocalizedUnicodeTagDataEntry.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -56,7 +55,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 return true;
             }
 
-            return base.Equals(other) && this.Texts.SequenceEqual(other.Texts);
+            return base.Equals(other) && this.Texts.AsSpan().SequenceEqual(other.Texts);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccMultiProcessElementsTagDataEntry.cs

@@ -57,10 +57,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
         /// <inheritdoc/>
         public override bool Equals(IccTagDataEntry other)
-        {
-            var entry = other as IccMultiProcessElementsTagDataEntry;
-            return entry != null && this.Equals(entry);
-        }
+            => other is IccMultiProcessElementsTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccMultiProcessElementsTagDataEntry other)
@@ -78,14 +75,11 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
             return base.Equals(other)
                 && this.InputChannelCount == other.InputChannelCount
                 && this.OutputChannelCount == other.OutputChannelCount
-                && this.Data.SequenceEqual(other.Data);
+                && this.Data.AsSpan().SequenceEqual(other.Data);
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccMultiProcessElementsTagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccMultiProcessElementsTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccNamedColor2TagDataEntry.cs

@@ -143,7 +143,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 && string.Equals(this.Prefix, other.Prefix)
                 && string.Equals(this.Suffix, other.Suffix)
                 && this.VendorFlags == other.VendorFlags
-                && this.Colors.SequenceEqual(other.Colors);
+                && this.Colors.AsSpan().SequenceEqual(other.Colors);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccProfileSequenceDescTagDataEntry.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -29,9 +28,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <param name="tagSignature">Tag Signature</param>
         public IccProfileSequenceDescTagDataEntry(IccProfileDescription[] descriptions, IccProfileTag tagSignature)
             : base(IccTypeSignature.ProfileSequenceDesc, tagSignature)
-        {
-            this.Descriptions = descriptions ?? throw new ArgumentNullException(nameof(descriptions));
-        }
+            => this.Descriptions = descriptions ?? throw new ArgumentNullException(nameof(descriptions));
 
         /// <summary>
         /// Gets the profile descriptions
@@ -40,9 +37,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
         /// <inheritdoc/>
         public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccProfileSequenceDescTagDataEntry entry && this.Equals(entry);
-        }
+            => other is IccProfileSequenceDescTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc />
         public bool Equals(IccProfileSequenceDescTagDataEntry other)
@@ -57,14 +52,12 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
                 return true;
             }
 
-            return base.Equals(other) && this.Descriptions.SequenceEqual(other.Descriptions);
+            return base.Equals(other) && this.Descriptions.AsSpan().SequenceEqual(other.Descriptions);
         }
 
         /// <inheritdoc/>
         public override bool Equals(object obj)
-        {
-            return obj is IccProfileSequenceDescTagDataEntry other && this.Equals(other);
-        }
+            => obj is IccProfileSequenceDescTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc />
         public override int GetHashCode() => HashCode.Combine(this.Signature, this.Descriptions);

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccResponseCurveSet16TagDataEntry.cs

@@ -51,10 +51,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public IccResponseCurve[] Curves { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccResponseCurveSet16TagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccResponseCurveSet16TagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc />
         public bool Equals(IccResponseCurveSet16TagDataEntry other)
@@ -71,14 +68,11 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
             return base.Equals(other)
                 && this.ChannelCount == other.ChannelCount
-                && this.Curves.SequenceEqual(other.Curves);
+                && this.Curves.AsSpan().SequenceEqual(other.Curves);
         }
 
         /// <inheritdoc />
-        public override bool Equals(object obj)
-        {
-            return obj is IccResponseCurveSet16TagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccResponseCurveSet16TagDataEntry other && this.Equals(other);
 
         /// <inheritdoc />
         public override int GetHashCode()

src/ImageSharp/MetaData/Profiles/ICC/TagDataEntries/IccUInt64ArrayTagDataEntry.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -26,10 +25,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <param name="data">The array data</param>
         /// <param name="tagSignature">Tag Signature</param>
         public IccUInt64ArrayTagDataEntry(ulong[] data, IccProfileTag tagSignature)
-            : base(IccTypeSignature.UInt64Array, tagSignature)
-        {
-            this.Data = data ?? throw new ArgumentNullException(nameof(data));
-        }
+            : base(IccTypeSignature.UInt64Array, tagSignature) => this.Data = data ?? throw new ArgumentNullException(nameof(data));
 
         /// <summary>
         /// Gets the array data
@@ -37,10 +33,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         public ulong[] Data { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(IccTagDataEntry other)
-        {
-            return other is IccUInt64ArrayTagDataEntry entry && this.Equals(entry);
-        }
+        public override bool Equals(IccTagDataEntry other) => other is IccUInt64ArrayTagDataEntry entry && this.Equals(entry);
 
         /// <inheritdoc/>
         public bool Equals(IccUInt64ArrayTagDataEntry other)
@@ -59,10 +52,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccUInt64ArrayTagDataEntry other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccUInt64ArrayTagDataEntry other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode() => HashCode.Combine(this.Signature, this.Data);

src/ImageSharp/MetaData/Profiles/ICC/Various/IccClut.cs

@@ -134,10 +134,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccClut other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccClut other && this.Equals(other);
 
         /// <inheritdoc/>
         public override int GetHashCode()

src/ImageSharp/MetaData/Profiles/ICC/Various/IccNamedColor.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -55,10 +54,7 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <returns>
         /// True if the <paramref name="left"/> parameter is equal to the <paramref name="right"/> parameter; otherwise, false.
         /// </returns>
-        public static bool operator ==(IccNamedColor left, IccNamedColor right)
-        {
-            return left.Equals(right);
-        }
+        public static bool operator ==(IccNamedColor left, IccNamedColor right) => left.Equals(right);
 
         /// <summary>
         /// Compares two <see cref="IccNamedColor"/> objects for equality.
@@ -68,23 +64,17 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
         /// <returns>
         /// True if the <paramref name="left"/> parameter is not equal to the <paramref name="right"/> parameter; otherwise, false.
         /// </returns>
-        public static bool operator !=(IccNamedColor left, IccNamedColor right)
-        {
-            return !left.Equals(right);
-        }
+        public static bool operator !=(IccNamedColor left, IccNamedColor right) => !left.Equals(right);
 
         /// <inheritdoc/>
-        public override bool Equals(object obj)
-        {
-            return obj is IccNamedColor other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccNamedColor other && this.Equals(other);
 
         /// <inheritdoc/>
         public bool Equals(IccNamedColor other)
         {
             return this.Name.Equals(other.Name)
-                && this.PcsCoordinates.SequenceEqual(other.PcsCoordinates)
-                && this.DeviceCoordinates.SequenceEqual(other.DeviceCoordinates);
+                && this.PcsCoordinates.AsSpan().SequenceEqual(other.PcsCoordinates)
+                && this.DeviceCoordinates.AsSpan().SequenceEqual(other.DeviceCoordinates);
         }
 
         /// <inheritdoc/>

src/ImageSharp/MetaData/Profiles/ICC/Various/IccProfileDescription.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -68,18 +67,15 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
         /// <inheritdoc/>
         public bool Equals(IccProfileDescription other) =>
-            this.DeviceManufacturer == other.DeviceManufacturer &&
-            this.DeviceModel == other.DeviceModel &&
-            this.DeviceAttributes == other.DeviceAttributes &&
-            this.TechnologyInformation == other.TechnologyInformation &&
-            this.DeviceManufacturerInfo.SequenceEqual(other.DeviceManufacturerInfo) &&
-            this.DeviceModelInfo.SequenceEqual(other.DeviceModelInfo);
+            this.DeviceManufacturer == other.DeviceManufacturer
+            && this.DeviceModel == other.DeviceModel
+            && this.DeviceAttributes == other.DeviceAttributes
+            && this.TechnologyInformation == other.TechnologyInformation
+            && this.DeviceManufacturerInfo.AsSpan().SequenceEqual(other.DeviceManufacturerInfo)
+            && this.DeviceModelInfo.AsSpan().SequenceEqual(other.DeviceModelInfo);
 
         /// <inheritdoc />
-        public override bool Equals(object obj)
-        {
-            return obj is IccProfileDescription other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccProfileDescription other && this.Equals(other);
 
         /// <inheritdoc />
         public override int GetHashCode()

src/ImageSharp/MetaData/Profiles/ICC/Various/IccProfileSequenceIdentifier.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0.
 
 using System;
-using System.Linq;
 
 namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 {
@@ -34,14 +33,11 @@ namespace SixLabors.ImageSharp.Metadata.Profiles.Icc
 
         /// <inheritdoc />
         public bool Equals(IccProfileSequenceIdentifier other) =>
-            this.Id.Equals(other.Id) &&
-            this.Description.SequenceEqual(other.Description);
+            this.Id.Equals(other.Id)
+            && this.Description.AsSpan().SequenceEqual(other.Description);
 
         /// <inheritdoc />
-        public override bool Equals(object obj)
-        {
-            return obj is IccProfileSequenceIdentifier other && this.Equals(other);
-        }
+        public override bool Equals(object obj) => obj is IccProfileSequenceIdentifier other && this.Equals(other);
 
         /// <inheritdoc />
         public override int GetHashCode() => HashCode.Combine(this.Id, this.Description);

src/ImageSharp/Processing/ResizeOptions.cs

@@ -1,8 +1,8 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
+using System;
 using System.Collections.Generic;
-using System.Linq;
 using SixLabors.ImageSharp.Processing.Processors.Transforms;
 using SixLabors.Primitives;
 
@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.Processing
         /// <summary>
         /// Gets or sets the center coordinates.
         /// </summary>
-        public IEnumerable<float> CenterCoordinates { get; set; } = Enumerable.Empty<float>();
+        public IEnumerable<float> CenterCoordinates { get; set; } = Array.Empty<float>();
 
         /// <summary>
         /// Gets or sets the target size.