Merge pull request #3177 from SixLabors/js/net10-net11-targets

Retarget builds to .NET 10 and 11

.gitattributes

@@ -110,6 +110,7 @@
 ###############################################################################
 # Handle image files by git lfs
 ###############################################################################
+*.pdf               filter=lfs diff=lfs merge=lfs -text
 *.jpg               filter=lfs diff=lfs merge=lfs -text
 *.jpeg              filter=lfs diff=lfs merge=lfs -text
 *.bmp               filter=lfs diff=lfs merge=lfs -text

.github/workflows/build-and-test.yml

@@ -64,48 +64,48 @@ jobs:
       matrix:
         options:
           - os: ubuntu-latest
-            framework: net10.0
+            framework: net11.0
-            sdk: 10.0.x
+            sdk: 11.0.x
             sdk-preview: true
             runtime: -x64
             codecov: false
           - os: macos-26
-            framework: net10.0
+            framework: net11.0
-            sdk: 10.0.x
+            sdk: 11.0.x
             sdk-preview: true
             runtime: -x64
             codecov: false
           - os: windows-latest
-            framework: net10.0
+            framework: net11.0
-            sdk: 10.0.x
+            sdk: 11.0.x
             sdk-preview: true
             runtime: -x64
             codecov: false
           - os: ubuntu-22.04-arm
-            framework: net10.0
+            framework: net11.0
-            sdk: 10.0.x
+            sdk: 11.0.x
             sdk-preview: true
             runtime: -x64
             codecov: false
 
           - os: ubuntu-latest
-            framework: net8.0
+            framework: net10.0
-            sdk: 8.0.x
+            sdk: 10.0.x
             runtime: -x64
             codecov: false
           - os: macos-26
-            framework: net8.0
+            framework: net10.0
-            sdk: 8.0.x
+            sdk: 10.0.x
             runtime: -x64
             codecov: false
           - os: windows-latest
-            framework: net8.0
+            framework: net10.0
-            sdk: 8.0.x
+            sdk: 10.0.x
             runtime: -x64
             codecov: false
           - os: ubuntu-22.04-arm
-            framework: net8.0
+            framework: net10.0
-            sdk: 8.0.x
+            sdk: 10.0.x
             runtime: -x64
             codecov: false
 
@@ -169,14 +169,15 @@ jobs:
         uses: actions/setup-dotnet@v6
         with:
           dotnet-version: |
-            8.0.x
+            10.0.x
 
       - name: DotNet Setup Preview
         if: ${{ matrix.options.sdk-preview == true }}
         uses: actions/setup-dotnet@v6
         with:
+          dotnet-quality: preview
           dotnet-version: |
-            10.0.x
+            11.0.x
 
       - name: DotNet Build
         if: ${{ matrix.options.sdk-preview != true }}

.github/workflows/code-coverage.yml

@@ -11,7 +11,7 @@ jobs:
       matrix:
         options:
           - os: ubuntu-latest
-            framework: net8.0
+            framework: net10.0
             runtime: -x64
             codecov: true
 
@@ -70,7 +70,7 @@ jobs:
         uses: actions/setup-dotnet@v6
         with:
           dotnet-version: |
-            8.0.x
+            10.0.x
 
       - name: DotNet Build
         shell: pwsh

Directory.Build.props

@@ -21,14 +21,6 @@
   <!-- Import the shared global .props file -->
   <Import Project="$(MSBuildThisFileDirectory)shared-infrastructure\msbuild\props\SixLabors.Global.props" />
 
-  <PropertyGroup Condition="'$(TargetFramework)' == 'net8.0' OR '$(TargetFramework)' == 'net9.0'">
-    <LangVersion>12.0</LangVersion>
-  </PropertyGroup>
-
-  <PropertyGroup Condition="'$(TargetFramework)' == 'net10.0'">
-    <LangVersion>14.0</LangVersion>
-  </PropertyGroup>
-
   <!--
   Ensure all custom build configurations based upon "Release" are optimized.
   This is easier than setting each project individually.

global.json

@@ -0,0 +1,18 @@
+// Pins the .NET SDK to major version 10 or later for all SixLabors repositories.
+// The build copies this file to consuming repositories together with .editorconfig and
+// the other shared config files (see msbuild/targets/SixLabors.Src.targets).
+{
+  "sdk": {
+    // The floor, not an exact build: resolution never selects an SDK below major 10.
+    "version": "10.0.0",
+
+    // Select the newest installed SDK at or above the floor. This spans feature bands,
+    // minor versions, and major versions, so a machine with only stable 10.0.x SDKs
+    // resolves the newest of those, and a machine with a newer SDK resolves that instead.
+    "rollForward": "latestMajor",
+
+    // Let the CLI and Visual Studio select preview SDKs when one is installed.
+    // Machines and CI lanes without a preview SDK are unaffected.
+    "allowPrerelease": true
+  }
+}

shared-infrastructure

@@ -1 +1 @@
-Subproject commit 6949b1094c3ccf672b93608f3f74a8b483426d4b
+Subproject commit 52fc1c3e87a755b2b17ce77e8cd22ec4bea17bcb

src/ImageSharp/Common/Extensions/StreamExtensions.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -17,7 +17,7 @@ internal static class StreamExtensions
     /// <param name="buffer">The buffer.</param>
     /// <param name="offset">The offset within the buffer to begin writing.</param>
     /// <param name="count">The number of bytes to write to the stream.</param>
-    public static void Write(this Stream stream, Span<byte> buffer, int offset, int count)
+    public static void Write(this Stream stream, ReadOnlySpan<byte> buffer, int offset, int count)
         => stream.Write(buffer.Slice(offset, count));
 
     /// <summary>

src/ImageSharp/Common/Helpers/Numerics.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Numerics;
@@ -939,20 +939,10 @@ internal static class Numerics
     /// <typeparam name="TVector">The type of the vector.</typeparam>
     /// <param name="span">The given span.</param>
     /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint VectorCount<TVector>(this Span<byte> span)
+    public static nuint VectorCount<TVector>(this ReadOnlySpan<byte> span)
         where TVector : struct
         => (uint)span.Length / (uint)Vector<TVector>.Count;
 
-    /// <summary>
-    /// Gets the count of vectors that safely fit into the given span.
-    /// </summary>
-    /// <typeparam name="TVector">The type of the vector.</typeparam>
-    /// <param name="span">The given span.</param>
-    /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector128Count<TVector>(this Span<byte> span)
-        where TVector : struct
-        => (uint)span.Length / (uint)Vector128<TVector>.Count;
-
     /// <summary>
     /// Gets the count of vectors that safely fit into the given span.
     /// </summary>
@@ -963,16 +953,6 @@ internal static class Numerics
         where TVector : struct
         => (uint)span.Length / (uint)Vector128<TVector>.Count;
 
-    /// <summary>
-    /// Gets the count of vectors that safely fit into the given span.
-    /// </summary>
-    /// <typeparam name="TVector">The type of the vector.</typeparam>
-    /// <param name="span">The given span.</param>
-    /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector256Count<TVector>(this Span<byte> span)
-        where TVector : struct
-        => (uint)span.Length / (uint)Vector256<TVector>.Count;
-
     /// <summary>
     /// Gets the count of vectors that safely fit into the given span.
     /// </summary>
@@ -983,16 +963,6 @@ internal static class Numerics
         where TVector : struct
         => (uint)span.Length / (uint)Vector256<TVector>.Count;
 
-    /// <summary>
-    /// Gets the count of vectors that safely fit into the given span.
-    /// </summary>
-    /// <typeparam name="TVector">The type of the vector.</typeparam>
-    /// <param name="span">The given span.</param>
-    /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector512Count<TVector>(this Span<byte> span)
-        where TVector : struct
-        => (uint)span.Length / (uint)Vector512<TVector>.Count;
-
     /// <summary>
     /// Gets the count of vectors that safely fit into the given span.
     /// </summary>
@@ -1009,7 +979,7 @@ internal static class Numerics
     /// <typeparam name="TVector">The type of the vector.</typeparam>
     /// <param name="span">The given span.</param>
     /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint VectorCount<TVector>(this Span<float> span)
+    public static nuint VectorCount<TVector>(this ReadOnlySpan<float> span)
         where TVector : struct
         => (uint)span.Length / (uint)Vector<TVector>.Count;
 
@@ -1019,7 +989,7 @@ internal static class Numerics
     /// <typeparam name="TVector">The type of the vector.</typeparam>
     /// <param name="span">The given span.</param>
     /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector128Count<TVector>(this Span<float> span)
+    public static nuint Vector128Count<TVector>(this ReadOnlySpan<float> span)
         where TVector : struct
         => (uint)span.Length / (uint)Vector128<TVector>.Count;
 
@@ -1029,7 +999,7 @@ internal static class Numerics
     /// <typeparam name="TVector">The type of the vector.</typeparam>
     /// <param name="span">The given span.</param>
     /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector256Count<TVector>(this Span<float> span)
+    public static nuint Vector256Count<TVector>(this ReadOnlySpan<float> span)
         where TVector : struct
         => (uint)span.Length / (uint)Vector256<TVector>.Count;
 
@@ -1049,7 +1019,7 @@ internal static class Numerics
     /// <typeparam name="TVector">The type of the vector.</typeparam>
     /// <param name="span">The given span.</param>
     /// <returns>Count of vectors that safely fit into the span.</returns>
-    public static nuint Vector512Count<TVector>(this Span<float> span)
+    public static nuint Vector512Count<TVector>(this ReadOnlySpan<float> span)
         where TVector : struct
         => (uint)span.Length / (uint)Vector512<TVector>.Count;
 

src/ImageSharp/Common/Helpers/SimdUtils.Shuffle.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Diagnostics;
@@ -464,7 +464,7 @@ internal static partial class SimdUtils
     }
 
     [Conditional("DEBUG")]
-    internal static void VerifyShuffle4SpanInput<T>(ReadOnlySpan<T> source, Span<T> destination)
+    internal static void VerifyShuffle4SpanInput<T>(ReadOnlySpan<T> source, ReadOnlySpan<T> destination)
         where T : struct
     {
         DebugGuard.IsTrue(
@@ -479,7 +479,7 @@ internal static partial class SimdUtils
     }
 
     [Conditional("DEBUG")]
-    private static void VerifyShuffle3SpanInput<T>(ReadOnlySpan<T> source, Span<T> destination)
+    private static void VerifyShuffle3SpanInput<T>(ReadOnlySpan<T> source, ReadOnlySpan<T> destination)
         where T : struct
     {
         DebugGuard.IsTrue(

src/ImageSharp/Common/Helpers/SimdUtils.cs

@@ -72,7 +72,7 @@ internal static partial class SimdUtils
     }
 
     [Conditional("DEBUG")]
-    private static void DebugVerifySpanInput(ReadOnlySpan<byte> source, Span<float> dest, int shouldBeDivisibleBy)
+    private static void DebugVerifySpanInput(ReadOnlySpan<byte> source, ReadOnlySpan<float> dest, int shouldBeDivisibleBy)
     {
         DebugGuard.IsTrue(source.Length == dest.Length, nameof(source), "Input spans must be of same length!");
         DebugGuard.IsTrue(
@@ -82,7 +82,7 @@ internal static partial class SimdUtils
     }
 
     [Conditional("DEBUG")]
-    private static void DebugVerifySpanInput(ReadOnlySpan<float> source, Span<byte> destination, int shouldBeDivisibleBy)
+    private static void DebugVerifySpanInput(ReadOnlySpan<float> source, ReadOnlySpan<byte> destination, int shouldBeDivisibleBy)
     {
         DebugGuard.IsTrue(source.Length == destination.Length, nameof(source), "Input spans must be of same length!");
         DebugGuard.IsTrue(

src/ImageSharp/Formats/Exr/Compression/Decompressors/B44ExrCompression.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -141,7 +141,7 @@ internal class B44ExrCompression : ExrBaseDecompressor
     /// </summary>
     /// <param name="b">The source byte data to unpack.</param>
     /// <param name="s">Destintation buffer.</param>
-    private static void Unpack14(Span<byte> b, Span<ushort> s)
+    private static void Unpack14(ReadOnlySpan<byte> b, Span<ushort> s)
     {
         s[0] = (ushort)((b[0] << 8) | b[1]);
 
@@ -185,7 +185,7 @@ internal class B44ExrCompression : ExrBaseDecompressor
     /// </summary>
     /// <param name="b">The source byte data to unpack.</param>
     /// <param name="s">The destination buffer.</param>
-    private static void Unpack3(Span<byte> b, Span<ushort> s)
+    private static void Unpack3(ReadOnlySpan<byte> b, Span<ushort> s)
     {
         s[0] = (ushort)((b[0] << 8) | b[1]);
 

src/ImageSharp/Formats/Exr/Compression/ExrBaseDecompressor.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.IO.Compression;
@@ -98,7 +98,7 @@ internal abstract class ExrBaseDecompressor : ExrBaseCompression
     /// <param name="source">The source data.</param>
     /// <param name="unCompressedBytes">The uncompressed bytes.</param>
     /// <param name="output">The output to write to.</param>
-    protected static void Interleave(Span<byte> source, uint unCompressedBytes, Span<byte> output)
+    protected static void Interleave(ReadOnlySpan<byte> source, uint unCompressedBytes, Span<byte> output)
     {
         int sourceOffset = 0;
         int offset0 = 0;

src/ImageSharp/Formats/Exr/ExrDecoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 #nullable disable
 
@@ -320,7 +320,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     private static int ReadFloatChannelData(
         BufferedReadStream stream,
         ExrChannelInfo channel,
-        Span<byte> decompressedPixelData,
+        ReadOnlySpan<byte> decompressedPixelData,
         Span<float> redPixelData,
         Span<float> greenPixelData,
         Span<float> bluePixelData,
@@ -371,7 +371,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     private int ReadUnsignedIntChannelData(
         BufferedReadStream stream,
         ExrChannelInfo channel,
-        Span<byte> decompressedPixelData,
+        ReadOnlySpan<byte> decompressedPixelData,
         Span<uint> redPixelData,
         Span<uint> greenPixelData,
         Span<uint> bluePixelData,
@@ -414,7 +414,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     /// <param name="pixelData">The pixel data as float.</param>
     /// <param name="width">The width in pixel of a row.</param>
     /// <returns>The bytes read.</returns>
-    private static int ReadChannelData(ExrChannelInfo channel, Span<byte> decompressedPixelData, Span<float> pixelData, int width) => channel.PixelType switch
+    private static int ReadChannelData(ExrChannelInfo channel, ReadOnlySpan<byte> decompressedPixelData, Span<float> pixelData, int width) => channel.PixelType switch
     {
         ExrPixelType.Half => ReadPixelRowChannelHalfSingle(decompressedPixelData, pixelData, width),
         ExrPixelType.Float => ReadPixelRowChannelSingle(decompressedPixelData, pixelData, width),
@@ -429,7 +429,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     /// <param name="pixelData">The pixel data as uint.</param>
     /// <param name="width">The width in pixels.</param>
     /// <returns>The bytes read.</returns>
-    private static int ReadChannelData(ExrChannelInfo channel, Span<byte> decompressedPixelData, Span<uint> pixelData, int width) => channel.PixelType switch
+    private static int ReadChannelData(ExrChannelInfo channel, ReadOnlySpan<byte> decompressedPixelData, Span<uint> pixelData, int width) => channel.PixelType switch
     {
         ExrPixelType.UnsignedInt => ReadPixelRowChannelUnsignedInt(decompressedPixelData, pixelData, width),
         _ => 0,
@@ -442,7 +442,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     /// <param name="channelData">The channel data as float.</param>
     /// <param name="width">The width of a row in pixels.</param>
     /// <returns>The bytes read.</returns>
-    private static int ReadPixelRowChannelHalfSingle(Span<byte> decompressedPixelData, Span<float> channelData, int width)
+    private static int ReadPixelRowChannelHalfSingle(ReadOnlySpan<byte> decompressedPixelData, Span<float> channelData, int width)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)
@@ -462,7 +462,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     /// <param name="channelData">The pixel data as float.</param>
     /// <param name="width">The width in pixels of a row.</param>
     /// <returns>The bytes read.</returns>
-    private static int ReadPixelRowChannelSingle(Span<byte> decompressedPixelData, Span<float> channelData, int width)
+    private static int ReadPixelRowChannelSingle(ReadOnlySpan<byte> decompressedPixelData, Span<float> channelData, int width)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)
@@ -482,7 +482,7 @@ internal sealed class ExrDecoderCore : ImageDecoderCore
     /// <param name="channelData">The uint pixel data.</param>
     /// <param name="width">The width of a row in pixels.</param>
     /// <returns>The bytes read.</returns>
-    private static int ReadPixelRowChannelUnsignedInt(Span<byte> decompressedPixelData, Span<uint> channelData, int width)
+    private static int ReadPixelRowChannelUnsignedInt(ReadOnlySpan<byte> decompressedPixelData, Span<uint> channelData, int width)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)

src/ImageSharp/Formats/Exr/ExrEncoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -364,7 +364,7 @@ internal sealed class ExrEncoderCore
     /// <param name="blueBuffer">The blue channel buffer.</param>
     /// <param name="greenBuffer">The green channel buffer.</param>
     /// <param name="redBuffer">The red channel buffer.</param>
-    private static void WriteSingleRow(Span<byte> buffer, int width, Span<float> alphaBuffer, Span<float> blueBuffer, Span<float> greenBuffer, Span<float> redBuffer)
+    private static void WriteSingleRow(Span<byte> buffer, int width, ReadOnlySpan<float> alphaBuffer, ReadOnlySpan<float> blueBuffer, ReadOnlySpan<float> greenBuffer, ReadOnlySpan<float> redBuffer)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)
@@ -401,7 +401,7 @@ internal sealed class ExrEncoderCore
     /// <param name="blueBuffer">The blue channel buffer.</param>
     /// <param name="greenBuffer">The green channel buffer.</param>
     /// <param name="redBuffer">The red channel buffer.</param>
-    private static void WriteHalfSingleRow(Span<byte> buffer, int width, Span<float> alphaBuffer, Span<float> blueBuffer, Span<float> greenBuffer, Span<float> redBuffer)
+    private static void WriteHalfSingleRow(Span<byte> buffer, int width, ReadOnlySpan<float> alphaBuffer, ReadOnlySpan<float> blueBuffer, ReadOnlySpan<float> greenBuffer, ReadOnlySpan<float> redBuffer)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)
@@ -438,7 +438,7 @@ internal sealed class ExrEncoderCore
     /// <param name="blueBuffer">The blue channel buffer.</param>
     /// <param name="greenBuffer">The green channel buffer.</param>
     /// <param name="redBuffer">The red channel buffer.</param>
-    private static void WriteUnsignedIntRow(Span<byte> buffer, int width, Span<uint> alphaBuffer, Span<uint> blueBuffer, Span<uint> greenBuffer, Span<uint> redBuffer)
+    private static void WriteUnsignedIntRow(Span<byte> buffer, int width, ReadOnlySpan<uint> alphaBuffer, ReadOnlySpan<uint> blueBuffer, ReadOnlySpan<uint> greenBuffer, ReadOnlySpan<uint> redBuffer)
     {
         int offset = 0;
         for (int x = 0; x < width; x++)

src/ImageSharp/Formats/Jpeg/Components/Block8x8.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Numerics;
@@ -129,7 +129,7 @@ internal partial struct Block8x8
     /// <summary>
     /// Cast and copy <see cref="Size"/> <see cref="int"/>-s from the beginning of 'source' span.
     /// </summary>
-    public void LoadFrom(Span<int> source)
+    public void LoadFrom(ReadOnlySpan<int> source)
     {
         for (int i = 0; i < Size; i++)
         {

src/ImageSharp/Formats/Jpeg/Components/Block8x8F.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Numerics;
@@ -115,7 +115,7 @@ internal partial struct Block8x8F : IEquatable<Block8x8F>
     /// Load raw 32bit floating point data from source
     /// </summary>
     /// <param name="source">Source</param>
-    public unsafe void LoadFrom(Span<int> source)
+    public unsafe void LoadFrom(ReadOnlySpan<int> source)
     {
         fixed (Vector4* ptr = &this.V0L)
         {

src/ImageSharp/Formats/Jpeg/JpegDecoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 #nullable disable
 
@@ -1126,7 +1126,7 @@ internal sealed class JpegDecoderCore : ImageDecoderCore, IRawJpegData
     /// <param name="blockDataSpan">The span holding the block resource data.</param>
     /// <returns>The length of the name.</returns>
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static int ReadImageResourceNameLength(Span<byte> blockDataSpan)
+    private static int ReadImageResourceNameLength(ReadOnlySpan<byte> blockDataSpan)
     {
         byte nameLength = blockDataSpan[2];
         int nameDataSize = nameLength == 0 ? 2 : nameLength;
@@ -1145,7 +1145,7 @@ internal sealed class JpegDecoderCore : ImageDecoderCore, IRawJpegData
     /// <param name="resourceBlockNameLength">The length of the block name.</param>
     /// <returns>The block length.</returns>
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static int ReadResourceDataLength(Span<byte> blockDataSpan, int resourceBlockNameLength)
+    private static int ReadResourceDataLength(ReadOnlySpan<byte> blockDataSpan, int resourceBlockNameLength)
         => BinaryPrimitives.ReadInt32BigEndian(blockDataSpan.Slice(2 + resourceBlockNameLength, 4));
 
     /// <summary>

src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 #nullable disable
 
@@ -620,7 +620,7 @@ internal sealed unsafe partial class JpegEncoderCore
     /// </summary>
     /// <param name="components">The collecction of component configuration items.</param>
     /// <param name="buffer">Temporary buffer.</param>
-    private void WriteStartOfScan(Span<JpegComponentConfig> components, Span<byte> buffer) =>
+    private void WriteStartOfScan(ReadOnlySpan<JpegComponentConfig> components, Span<byte> buffer) =>
         this.WriteStartOfScan(components, buffer, 0x00, 0x3f);
 
     /// <summary>
@@ -630,7 +630,7 @@ internal sealed unsafe partial class JpegEncoderCore
     /// <param name="buffer">Temporary buffer.</param>
     /// <param name="spectralStart">Start of spectral selection</param>
     /// <param name="spectralEnd">End of spectral selection</param>
-    private void WriteStartOfScan(Span<JpegComponentConfig> components, Span<byte> buffer, byte spectralStart, byte spectralEnd)
+    private void WriteStartOfScan(ReadOnlySpan<JpegComponentConfig> components, Span<byte> buffer, byte spectralStart, byte spectralEnd)
     {
         // Write the SOS (Start Of Scan) marker "\xff\xda" followed by 12 bytes:
         // - the marker length "\x00\x0c",

src/ImageSharp/Formats/Png/PngEncoderCore.cs

@@ -1541,7 +1541,7 @@ internal sealed class PngEncoderCore : IDisposable
     /// <param name="stream">The <see cref="Stream"/> to write to.</param>
     /// <param name="type">The type of chunk to write.</param>
     /// <param name="data">The <see cref="T:byte[]"/> containing data.</param>
-    private void WriteChunk(Stream stream, PngChunkType type, Span<byte> data)
+    private void WriteChunk(Stream stream, PngChunkType type, ReadOnlySpan<byte> data)
         => this.WriteChunk(stream, type, data, 0, data.Length);
 
     /// <summary>
@@ -1552,7 +1552,7 @@ internal sealed class PngEncoderCore : IDisposable
     /// <param name="data">The <see cref="Span{Byte}"/> containing data.</param>
     /// <param name="offset">The position to offset the data at.</param>
     /// <param name="length">The of the data to write.</param>
-    private void WriteChunk(Stream stream, PngChunkType type, Span<byte> data, int offset, int length)
+    private void WriteChunk(Stream stream, PngChunkType type, ReadOnlySpan<byte> data, int offset, int length)
     {
         Span<byte> buffer = stackalloc byte[8];
 
@@ -1584,7 +1584,7 @@ internal sealed class PngEncoderCore : IDisposable
     /// <param name="data">The <see cref="Span{Byte}"/> containing data.</param>
     /// <param name="offset">The position to offset the data at.</param>
     /// <param name="length">The of the data to write.</param>
-    private void WriteFrameDataChunk(Stream stream, uint sequenceNumber, Span<byte> data, int offset, int length)
+    private void WriteFrameDataChunk(Stream stream, uint sequenceNumber, ReadOnlySpan<byte> data, int offset, int length)
     {
         Span<byte> buffer = stackalloc byte[12];
 

src/ImageSharp/Formats/Tga/TgaEncoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -268,7 +268,7 @@ internal sealed class TgaEncoderCore
     /// <param name="pixelRow">A pixel row of the image to encode.</param>
     /// <param name="xStart">X coordinate to start searching for the same pixels.</param>
     /// <returns>The number of equal pixels.</returns>
-    private static byte FindEqualPixels<TPixel>(Span<TPixel> pixelRow, int xStart)
+    private static byte FindEqualPixels<TPixel>(ReadOnlySpan<TPixel> pixelRow, int xStart)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         byte equalPixelCount = 0;
@@ -301,7 +301,7 @@ internal sealed class TgaEncoderCore
     /// <param name="pixelRow">A pixel row of the image to encode.</param>
     /// <param name="xStart">X coordinate to start searching for the unequal pixels.</param>
     /// <returns>The number of equal pixels.</returns>
-    private static byte FindUnEqualPixels<TPixel>(Span<TPixel> pixelRow, int xStart)
+    private static byte FindUnEqualPixels<TPixel>(ReadOnlySpan<TPixel> pixelRow, int xStart)
         where TPixel : unmanaged, IPixel<TPixel>
     {
         byte unEqualPixelCount = 0;

src/ImageSharp/Formats/Tiff/Compression/Compressors/T6BitCompressor.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 #nullable disable
 
@@ -148,7 +148,7 @@ internal sealed class T6BitCompressor : TiffCcittCompressor
     /// <returns>The index of the first pixel at or after <paramref name="startIndex"/>
     /// that does not match <paramref name="color"/>, or the length of <paramref name="row"/>,
     /// whichever comes first.</returns>
-    private static uint FindRunEnd(Span<byte> row, uint startIndex, byte? color = null)
+    private static uint FindRunEnd(ReadOnlySpan<byte> row, uint startIndex, byte? color = null)
     {
         if (startIndex >= row.Length)
         {

src/ImageSharp/Formats/Tiff/Compression/Compressors/TiffLzwEncoder.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -104,7 +104,7 @@ internal sealed class TiffLzwEncoder : IDisposable
     /// </summary>
     /// <param name="data">The data to compress.</param>
     /// <param name="stream">The stream to write to.</param>
-    public void Encode(Span<byte> data, Stream stream)
+    public void Encode(ReadOnlySpan<byte> data, Stream stream)
     {
         this.Reset();
 
@@ -214,7 +214,7 @@ internal sealed class TiffLzwEncoder : IDisposable
         this.bufferPosition = 0;
     }
 
-    private byte ReadNextByte(Span<byte> data) => data[this.bufferPosition++];
+    private byte ReadNextByte(ReadOnlySpan<byte> data) => data[this.bufferPosition++];
 
     private void IncreaseCodeSizeOrResetIfNeeded(Stream stream)
     {

src/ImageSharp/Formats/Tiff/TiffDecoderCore.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 #nullable disable
 
@@ -440,8 +440,8 @@ internal class TiffDecoderCore : ImageDecoderCore
         int width,
         int height,
         int rowsPerStrip,
-        Span<ulong> stripOffsets,
+        ReadOnlySpan<ulong> stripOffsets,
-        Span<ulong> stripByteCounts,
+        ReadOnlySpan<ulong> stripByteCounts,
         CancellationToken cancellationToken)
         where TPixel : unmanaged, IPixel<TPixel>
     {
@@ -518,8 +518,8 @@ internal class TiffDecoderCore : ImageDecoderCore
         int width,
         int height,
         int rowsPerStrip,
-        Span<ulong> stripOffsets,
+        ReadOnlySpan<ulong> stripOffsets,
-        Span<ulong> stripByteCounts,
+        ReadOnlySpan<ulong> stripByteCounts,
         CancellationToken cancellationToken)
        where TPixel : unmanaged, IPixel<TPixel>
     {
@@ -670,8 +670,8 @@ internal class TiffDecoderCore : ImageDecoderCore
         int tileLength,
         int tilesAcross,
         int tilesDown,
-        Span<ulong> tileOffsets,
+        ReadOnlySpan<ulong> tileOffsets,
-        Span<ulong> tileByteCounts,
+        ReadOnlySpan<ulong> tileByteCounts,
         CancellationToken cancellationToken)
         where TPixel : unmanaged, IPixel<TPixel>
     {
@@ -780,8 +780,8 @@ internal class TiffDecoderCore : ImageDecoderCore
         int tileLength,
         int tilesAcross,
         int tilesDown,
-        Span<ulong> tileOffsets,
+        ReadOnlySpan<ulong> tileOffsets,
-        Span<ulong> tileByteCounts,
+        ReadOnlySpan<ulong> tileByteCounts,
         CancellationToken cancellationToken)
         where TPixel : unmanaged, IPixel<TPixel>
     {

src/ImageSharp/Formats/Tiff/Writers/TiffStreamWriter.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers.Binary;
@@ -103,7 +103,7 @@ internal sealed class TiffStreamWriter : IDisposable
     /// Writes an array of bytes to the current stream, padded to four-bytes.
     /// </summary>
     /// <param name="value">The bytes to write.</param>
-    public void WritePadded(Span<byte> value)
+    public void WritePadded(ReadOnlySpan<byte> value)
     {
         this.BaseStream.Write(value);
 

src/ImageSharp/Formats/Webp/AlphaDecoder.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -275,7 +275,7 @@ internal class AlphaDecoder : IDisposable
         Vp8LTransform transform,
         int yStart,
         int yEnd,
-        Span<byte> src,
+        ReadOnlySpan<byte> src,
         Span<byte> dst)
     {
         int bitsPerPixel = 8 >> transform.Bits;
@@ -311,7 +311,7 @@ internal class AlphaDecoder : IDisposable
         }
     }
 
-    private static void HorizontalUnfilter(Span<byte> prev, Span<byte> input, Span<byte> dst, int width)
+    private static void HorizontalUnfilter(ReadOnlySpan<byte> prev, Span<byte> input, Span<byte> dst, int width)
     {
         if (Vector128.IsHardwareAccelerated && width >= 9)
         {
@@ -368,7 +368,7 @@ internal class AlphaDecoder : IDisposable
         }
     }
 
-    private static void GradientUnfilter(Span<byte> prev, Span<byte> input, Span<byte> dst, int width)
+    private static void GradientUnfilter(ReadOnlySpan<byte> prev, Span<byte> input, Span<byte> dst, int width)
     {
         if (prev.IsEmpty)
         {
@@ -424,7 +424,7 @@ internal class AlphaDecoder : IDisposable
         return true;
     }
 
-    private static void MapAlpha(Span<byte> src, Span<uint> colorMap, Span<byte> dst, int yStart, int yEnd, int width)
+    private static void MapAlpha(ReadOnlySpan<byte> src, ReadOnlySpan<uint> colorMap, Span<byte> dst, int yStart, int yEnd, int width)
     {
         int offset = 0;
         for (int y = yStart; y < yEnd; y++)
@@ -448,7 +448,7 @@ internal class AlphaDecoder : IDisposable
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static void ExtractGreen(Span<uint> argb, Span<byte> alpha, int size)
+    private static void ExtractGreen(ReadOnlySpan<uint> argb, Span<byte> alpha, int size)
     {
         for (int i = 0; i < size; i++)
         {

src/ImageSharp/Formats/Webp/BitWriter/BitWriterBase.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using SixLabors.ImageSharp.Formats.Webp.Chunks;
@@ -177,7 +177,7 @@ internal abstract class BitWriterBase
     /// <param name="stream">The stream to write to.</param>
     /// <param name="dataBytes">The alpha channel data bytes.</param>
     /// <param name="alphaDataIsCompressed">Indicates, if the alpha channel data is compressed.</param>
-    public static void WriteAlphaChunk(Stream stream, Span<byte> dataBytes, bool alphaDataIsCompressed)
+    public static void WriteAlphaChunk(Stream stream, ReadOnlySpan<byte> dataBytes, bool alphaDataIsCompressed)
     {
         long pos = RiffHelper.BeginWriteChunk(stream, (uint)WebpChunkType.Alpha);
         byte flags = 0;

src/ImageSharp/Formats/Webp/BitWriter/Vp8BitWriter.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers.Binary;
@@ -223,7 +223,7 @@ internal class Vp8BitWriter : BitWriterBase
         }
     }
 
-    public int PutI4Mode(int mode, Span<byte> prob)
+    public int PutI4Mode(int mode, ReadOnlySpan<byte> prob)
     {
         if (this.PutBit(mode != B_DC_PRED, prob[0]))
         {

src/ImageSharp/Formats/Webp/Lossless/BackwardReferenceEncoder.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Six Labors.
+// Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
 using System.Buffers;
@@ -375,7 +375,7 @@ internal static class BackwardReferenceEncoder
         return chosenPathSize;
     }
 
-    private static void BackwardReferencesHashChainFollowChosenPath(ReadOnlySpan<uint> bgra, int cacheBits, Span<ushort> chosenPath, int chosenPathSize, Vp8LHashChain hashChain, Vp8LBackwardRefs backwardRefs)
+    private static void BackwardReferencesHashChainFollowChosenPath(ReadOnlySpan<uint> bgra, int cacheBits, ReadOnlySpan<ushort> chosenPath, int chosenPathSize, Vp8LHashChain hashChain, Vp8LBackwardRefs backwardRefs)
     {
         bool useColorCache = cacheBits > 0;
         ColorCache? colorCache = null;

src/ImageSharp/Formats/Webp/Lossless/ColorSpaceTransformUtils.cs

@@ -17,7 +17,7 @@ internal static class ColorSpaceTransformUtils
             const int span = 16;
             Span<ushort> values = stackalloc ushort[span];
 
-            // These shuffle masks are safe for use with Avx2.Shuffle because all indices are within their respective 128-bit lanes (0–15 for the low mask, 16–31 for the high mask),
+            // These shuffle masks are safe for use with Avx2.Shuffle because all indices are within their respective 128-bit lanes (0-15 for the low mask, 16-31 for the high mask),
             // and all disabled lanes are set to 0xFF to zero those bytes per the vpshufb specification. This guarantees lane-local shuffling with no cross-lane violations.
             Vector256<byte> collectColorBlueTransformsShuffleLowMask256 = Vector256.Create(255, 2, 255, 6, 255, 10, 255, 14, 255, 255, 255, 255, 255, 255, 255, 255, 255, 18, 255, 22, 255, 26, 255, 30, 255, 255, 255, 255, 255, 255, 255, 255);
             Vector256<byte> collectColorBlueTransformsShuffleHighMask256 = Vector256.Create(255, 255, 255, 255, 255, 255, 255, 255, 255, 2, 255, 6, 255, 10, 255, 14, 255, 255, 255, 255, 255, 255, 255, 255, 255, 18, 255, 22, 255, 26, 255, 30);
@@ -121,7 +121,7 @@ internal static class ColorSpaceTransformUtils
         }
     }
 
-    private static void CollectColorBlueTransformsScalar(Span<uint> bgra, int stride, int tileWidth, int tileHeight, int greenToBlue, int redToBlue, Span<int> histo)
+    private static void CollectColorBlueTransformsScalar(ReadOnlySpan<uint> bgra, int stride, int tileWidth, int tileHeight, int greenToBlue, int redToBlue, Span<int> histo)
     {
         int pos = 0;
         while (tileHeight-- > 0)
@@ -230,7 +230,7 @@ internal static class ColorSpaceTransformUtils
         }
     }
 
-    private static void CollectColorRedTransformsScalar(Span<uint> bgra, int stride, int tileWidth, int tileHeight, int greenToRed, Span<int> histo)
+    private static void CollectColorRedTransformsScalar(ReadOnlySpan<uint> bgra, int stride, int tileWidth, int tileHeight, int greenToRed, Span<int> histo)
     {
         int pos = 0;
         while (tileHeight-- > 0)

src/ImageSharp/Formats/Webp/Lossless/CostModel.cs

@@ -74,7 +74,7 @@ internal class CostModel
 
     public double GetLiteralCost(uint v) => this.Alpha[v >> 24] + this.Red[(v >> 16) & 0xff] + this.Literal[(v >> 8) & 0xff] + this.Blue[v & 0xff];
 
-    private static void ConvertPopulationCountTableToBitEstimates(int numSymbols, Span<uint> populationCounts, double[] output)
+    private static void ConvertPopulationCountTableToBitEstimates(int numSymbols, ReadOnlySpan<uint> populationCounts, double[] output)
     {
         uint sum = 0;
         int nonzeros = 0;

src/ImageSharp/Formats/Webp/Lossless/HistogramEncoder.cs

@@ -196,7 +196,7 @@ internal static class HistogramEncoder
 
     private static void HistogramCombineEntropyBin(
         Vp8LHistogramSet histograms,
-        Span<ushort> clusters,
+        ReadOnlySpan<ushort> clusters,
         Span<ushort> clusterMappings,
         Vp8LHistogram curCombo,
         ReadOnlySpan<ushort> binMap,

src/ImageSharp/Formats/Webp/Lossless/HuffmanUtils.cs

@@ -159,7 +159,7 @@ internal static class HuffmanUtils
     /// <param name="histogramSize">The size of the histogram.</param>
     /// <param name="treeDepthLimit">The tree depth limit.</param>
     /// <param name="bitDepths">How many bits are used for the symbol.</param>
-    public static void GenerateOptimalTree(Span<HuffmanTree> tree, Span<uint> histogram, int histogramSize, int treeDepthLimit, byte[] bitDepths)
+    public static void GenerateOptimalTree(Span<HuffmanTree> tree, ReadOnlySpan<uint> histogram, int histogramSize, int treeDepthLimit, byte[] bitDepths)
     {
         uint countMin;
         int treeSizeOrig = 0;
@@ -445,7 +445,7 @@ internal static class HuffmanUtils
         return totalSize;
     }
 
-    private static int CodeRepeatedZeros(int repetitions, Span<HuffmanTreeToken> tokens)
+    private static int CodeRepeatedZeros(int repetitions, ReadOnlySpan<HuffmanTreeToken> tokens)
     {
         int pos = 0;
         while (repetitions >= 1)
@@ -487,7 +487,7 @@ internal static class HuffmanUtils
         return pos;
     }
 
-    private static int CodeRepeatedValues(int repetitions, Span<HuffmanTreeToken> tokens, int value, int prevValue)
+    private static int CodeRepeatedValues(int repetitions, ReadOnlySpan<HuffmanTreeToken> tokens, int value, int prevValue)
     {
         int pos = 0;
 
@@ -565,7 +565,7 @@ internal static class HuffmanUtils
         }
     }
 
-    private static void SetBitDepths(Span<HuffmanTree> tree, Span<HuffmanTree> pool, byte[] bitDepths, int level)
+    private static void SetBitDepths(ReadOnlySpan<HuffmanTree> tree, Span<HuffmanTree> pool, byte[] bitDepths, int level)
     {
         if (tree[0].PoolIndexLeft >= 0)
         {

src/ImageSharp/Formats/Webp/Lossless/LosslessUtils.cs

@@ -98,7 +98,7 @@ internal static unsafe class LosslessUtils
         if (Vector256.IsHardwareAccelerated && pixelData.Length >= 8)
         {
             // The `255` values disable the write for alpha (A), since 0x80 is set in the control byte (high bit set).
-            // Each byte index is within its respective 128-bit lane (0–15 and 16–31), so this is safe for per-lane shuffle.
+            // Each byte index is within its respective 128-bit lane (0-15 and 16-31), so this is safe for per-lane shuffle.
             // The high bits are not set for the index bytes, and the values are always < 16 per lane, satisfying AVX2 lane rules.
             Vector256<byte> addGreenToBlueAndRedMask = Vector256.Create(1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13, 255, 17, 255, 17, 255, 21, 255, 21, 255, 25, 255, 25, 255, 29, 255, 29, 255);
             nuint numPixels = (uint)pixelData.Length;
@@ -675,7 +675,7 @@ internal static unsafe class LosslessUtils
     /// <summary>
     /// Bundles multiple (1, 2, 4 or 8) pixels into a single pixel.
     /// </summary>
-    public static void BundleColorMap(Span<byte> row, int width, int xBits, Span<uint> dst)
+    public static void BundleColorMap(ReadOnlySpan<byte> row, int width, int xBits, Span<uint> dst)
     {
         int x;
         if (xBits > 0)

src/ImageSharp/Formats/Webp/Lossless/NearLosslessEnc.cs

@@ -99,7 +99,7 @@ internal static class NearLosslessEnc
         return biased & ~mask;
     }
 
-    private static bool IsSmooth(Span<uint> prevRow, Span<uint> currRow, Span<uint> nextRow, int ix, int limit) =>
+    private static bool IsSmooth(ReadOnlySpan<uint> prevRow, ReadOnlySpan<uint> currRow, ReadOnlySpan<uint> nextRow, int ix, int limit) =>
         IsNear(currRow[ix], currRow[ix - 1], limit) && // Check that all pixels in 4-connected neighborhood are smooth.
                 IsNear(currRow[ix], currRow[ix + 1], limit) &&
                 IsNear(currRow[ix], prevRow[ix], limit) &&

src/ImageSharp/Formats/Webp/Lossless/PredictorEncoder.cs

@@ -205,7 +205,7 @@ internal static unsafe class PredictorEncoder
         TransparentColorMode transparentColorMode,
         bool usedSubtractGreen,
         bool nearLossless,
-        Span<uint> modes,
+        ReadOnlySpan<uint> modes,
         Span<short> scratch)
     {
         const int numPredModes = 14;
@@ -334,7 +334,7 @@ internal static unsafe class PredictorEncoder
         int height,
         Span<uint> upperRowSpan,
         Span<uint> currentRowSpan,
-        Span<byte> maxDiffs,
+        ReadOnlySpan<byte> maxDiffs,
         int mode,
         int xStart,
         int xEnd,
@@ -575,7 +575,7 @@ internal static unsafe class PredictorEncoder
         int width,
         int height,
         int bits,
-        Span<uint> modes,
+        ReadOnlySpan<uint> modes,
         Span<uint> argbScratch,
         Span<uint> argb,
         int maxQuantization,
@@ -746,7 +746,7 @@ internal static unsafe class PredictorEncoder
     }
 #pragma warning restore SA1503 // Braces should not be omitted
 
-    private static void MaxDiffsForRow(int width, int stride, Span<uint> argb, int offset, Span<byte> maxDiffs, bool usedSubtractGreen)
+    private static void MaxDiffsForRow(int width, int stride, ReadOnlySpan<uint> argb, int offset, Span<byte> maxDiffs, bool usedSubtractGreen)
     {
         if (width <= 2)
         {
@@ -1058,7 +1058,7 @@ internal static unsafe class PredictorEncoder
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static float PredictionCostSpatial(Span<int> counts, int weight0, double expVal)
+    private static float PredictionCostSpatial(ReadOnlySpan<int> counts, int weight0, double expVal)
     {
         int significantSymbols = 256 >> 4;
         double expDecayFactor = 0.6;

src/ImageSharp/Formats/Webp/Lossless/Vp8LBitEntropy.cs

@@ -100,7 +100,7 @@ internal class Vp8LBitEntropy
         return this.Entropy < minLimit ? minLimit : this.Entropy;
     }
 
-    public void BitsEntropyUnrefined(Span<uint> array, int n)
+    public void BitsEntropyUnrefined(ReadOnlySpan<uint> array, int n)
     {
         this.Init();
 
@@ -125,7 +125,7 @@ internal class Vp8LBitEntropy
     /// <summary>
     /// Get the entropy for the distribution 'X'.
     /// </summary>
-    public void BitsEntropyUnrefined(Span<uint> x, int length, Vp8LStreaks stats)
+    public void BitsEntropyUnrefined(ReadOnlySpan<uint> x, int length, Vp8LStreaks stats)
     {
         int i;
         int iPrev = 0;
@@ -147,7 +147,7 @@ internal class Vp8LBitEntropy
         this.Entropy += LosslessUtils.FastSLog2(this.Sum);
     }
 
-    public void GetCombinedEntropyUnrefined(Span<uint> x, Span<uint> y, int length, Vp8LStreaks stats)
+    public void GetCombinedEntropyUnrefined(ReadOnlySpan<uint> x, ReadOnlySpan<uint> y, int length, Vp8LStreaks stats)
     {
         int i;
         int iPrev = 0;
@@ -169,7 +169,7 @@ internal class Vp8LBitEntropy
         this.Entropy += LosslessUtils.FastSLog2(this.Sum);
     }
 
-    public void GetEntropyUnrefined(Span<uint> x, int length, Vp8LStreaks stats)
+    public void GetEntropyUnrefined(ReadOnlySpan<uint> x, int length, Vp8LStreaks stats)
     {
         int i;
         int iPrev = 0;

src/ImageSharp/Formats/Webp/Lossless/Vp8LEncoder.cs

@@ -812,7 +812,7 @@ internal class Vp8LEncoder : IDisposable
         this.EncodeImageNoHuffman(this.TransformData.GetSpan(), this.HashChain, this.Refs[0], this.Refs[1], transformWidth, transformHeight, this.quality, lowEffort);
     }
 
-    private void EncodeImageNoHuffman(Span<uint> bgra, Vp8LHashChain hashChain, Vp8LBackwardRefs refsTmp1, Vp8LBackwardRefs refsTmp2, int width, int height, uint quality, bool lowEffort)
+    private void EncodeImageNoHuffman(ReadOnlySpan<uint> bgra, Vp8LHashChain hashChain, Vp8LBackwardRefs refsTmp1, Vp8LBackwardRefs refsTmp2, int width, int height, uint quality, bool lowEffort)
     {
         int cacheBits = 0;
         ushort[] histogramSymbols = new ushort[1]; // Only one tree, one symbol.
@@ -1044,7 +1044,7 @@ internal class Vp8LEncoder : IDisposable
         int width,
         int histoBits,
         Vp8LBackwardRefs backwardRefs,
-        Span<ushort> histogramSymbols,
+        ReadOnlySpan<ushort> histogramSymbols,
         HuffmanTreeCode[] huffmanCodes)
     {
         int histoXSize = histoBits > 0 ? LosslessUtils.SubSampleSize(width, histoBits) : 1;
@@ -1457,7 +1457,7 @@ internal class Vp8LEncoder : IDisposable
         }
     }
 
-    private static void ApplyPaletteFor(int width, int height, Span<uint> palette, int hashIdx, Span<uint> src, int srcStride, Span<uint> dst, int dstStride, Span<byte> tmpRow, uint[] buffer, int xBits)
+    private static void ApplyPaletteFor(int width, int height, ReadOnlySpan<uint> palette, int hashIdx, Span<uint> src, int srcStride, Span<uint> dst, int dstStride, Span<byte> tmpRow, uint[] buffer, int xBits)
     {
         uint prevPix = palette[0];
         uint prevIdx = 0;
@@ -1494,7 +1494,7 @@ internal class Vp8LEncoder : IDisposable
         }
     }
 
-    private static void ApplyPaletteForWithIdxMap(int width, int height, Span<uint> palette, Span<uint> src, int srcStride, Span<uint> dst, int dstStride, Span<byte> tmpRow, uint[] idxMap, int xBits, uint[] paletteSorted, int paletteSize)
+    private static void ApplyPaletteForWithIdxMap(int width, int height, ReadOnlySpan<uint> palette, Span<uint> src, int srcStride, Span<uint> dst, int dstStride, Span<byte> tmpRow, uint[] idxMap, int xBits, uint[] paletteSorted, int paletteSize)
     {
         uint prevPix = palette[0];
         uint prevIdx = 0;
@@ -1590,7 +1590,7 @@ internal class Vp8LEncoder : IDisposable
     /// <param name="palette">The palette.</param>
     /// <param name="numColors">Number of colors in the palette.</param>
     /// <returns>True, if the palette has no monotonous deltas.</returns>
-    private static bool PaletteHasNonMonotonousDeltas(Span<uint> palette, int numColors)
+    private static bool PaletteHasNonMonotonousDeltas(ReadOnlySpan<uint> palette, int numColors)
     {
         const uint predict = 0x000000;
         byte signFound = 0x00;
@@ -1619,6 +1619,7 @@ internal class Vp8LEncoder : IDisposable
         return (signFound & (signFound << 1)) != 0;  // two consequent signs.
     }
 
+#pragma warning disable CA1517 // False positive: https://github.com/dotnet/sdk/issues/53388
     /// <summary>
     /// Find greedily always the closest color of the predicted color to minimize
     /// deltas in the palette. This reduces storage needs since the palette is stored with delta encoding.
@@ -1647,6 +1648,7 @@ internal class Vp8LEncoder : IDisposable
             predict = palette[i];
         }
     }
+#pragma warning restore CA1517
 
     private static void GetHuffBitLengthsAndCodes(Vp8LHistogramSet histogramImage, HuffmanTreeCode[] huffmanCodes)
     {
@@ -1762,7 +1764,7 @@ internal class Vp8LEncoder : IDisposable
     /// <summary>
     /// Bundles multiple (1, 2, 4 or 8) pixels into a single pixel.
     /// </summary>
-    private static void BundleColorMap(Span<byte> row, int width, int xBits, Span<uint> dst)
+    private static void BundleColorMap(ReadOnlySpan<byte> row, int width, int xBits, Span<uint> dst)
     {
         int x;
         if (xBits > 0)
@@ -1836,7 +1838,7 @@ internal class Vp8LEncoder : IDisposable
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static uint SearchColorGreedy(Span<uint> palette, uint color)
+    private static uint SearchColorGreedy(ReadOnlySpan<uint> palette, uint color)
     {
         if (color == palette[0])
         {

src/ImageSharp/Formats/Webp/Lossless/Vp8LHistogram.cs

@@ -441,8 +441,8 @@ internal abstract unsafe class Vp8LHistogram
     }
 
     private static double GetCombinedEntropy(
-        Span<uint> x,
+        ReadOnlySpan<uint> x,
-        Span<uint> y,
+        ReadOnlySpan<uint> y,
         int length,
         bool isXUsed,
         bool isYUsed,
@@ -494,7 +494,7 @@ internal abstract unsafe class Vp8LHistogram
         return bitEntropy.BitsEntropyRefine() + stats.FinalHuffmanCost();
     }
 
-    private static double ExtraCostCombined(Span<uint> x, Span<uint> y, int length)
+    private static double ExtraCostCombined(ReadOnlySpan<uint> x, ReadOnlySpan<uint> y, int length)
     {
         double cost = 0.0d;
         for (int i = 2; i < length - 2; i++)
@@ -509,7 +509,7 @@ internal abstract unsafe class Vp8LHistogram
     /// <summary>
     /// Get the symbol entropy for the distribution 'population'.
     /// </summary>
-    private double PopulationCost(Span<uint> population, int length, ref uint trivialSym, int isUsedIndex, Vp8LStreaks stats, Vp8LBitEntropy bitEntropy)
+    private double PopulationCost(ReadOnlySpan<uint> population, int length, ref uint trivialSym, int isUsedIndex, Vp8LStreaks stats, Vp8LBitEntropy bitEntropy)
     {
         bitEntropy.Init();
         stats.Clear();
@@ -523,7 +523,7 @@ internal abstract unsafe class Vp8LHistogram
         return bitEntropy.BitsEntropyRefine() + stats.FinalHuffmanCost();
     }
 
-    private static double ExtraCost(Span<uint> population, int length)
+    private static double ExtraCost(ReadOnlySpan<uint> population, int length)
     {
         double cost = 0.0d;
         for (int i = 2; i < length - 2; i++)

src/ImageSharp/Formats/Webp/Lossless/WebpLosslessDecoder.cs

@@ -339,7 +339,7 @@ internal sealed class WebpLosslessDecoder
         }
     }
 
-    private static void AdvanceByOne(ref int col, ref int row, int width, ColorCache colorCache, ref int decodedPixels, Span<uint> pixelData, ref int lastCached)
+    private static void AdvanceByOne(ref int col, ref int row, int width, ColorCache colorCache, ref int decodedPixels, ReadOnlySpan<uint> pixelData, ref int lastCached)
     {
         col++;
         decodedPixels++;
@@ -826,7 +826,7 @@ internal sealed class WebpLosslessDecoder
         decoder.Metadata.HuffmanMask = numBits == 0 ? ~0 : (1 << numBits) - 1;
     }
 
-    private uint ReadPackedSymbols(Span<HTreeGroup> group, Span<uint> pixelData, int decodedPixels)
+    private uint ReadPackedSymbols(ReadOnlySpan<HTreeGroup> group, Span<uint> pixelData, int decodedPixels)
     {
         uint val = (uint)(this.bitReader.PrefetchBits() & (HuffmanUtils.HuffmanPackedTableSize - 1));
         HuffmanCode code = group[0].PackedTable[val];

src/ImageSharp/Formats/Webp/Lossy/LossyUtils.cs

@@ -123,7 +123,7 @@ internal static class LossyUtils
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static int Vp8_SseNxN(Span<byte> a, Span<byte> b, int w, int h)
+    public static int Vp8_SseNxN(ReadOnlySpan<byte> a, ReadOnlySpan<byte> b, int w, int h)
     {
         int count = 0;
         int offset = 0;
@@ -285,7 +285,7 @@ internal static class LossyUtils
         return Math.Abs(sum2 - sum1) >> 5;
     }
 
-    public static void DC16(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC16(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         int offsetMinus1 = offset - 1;
         int offsetMinusBps = offset - WebpConstants.Bps;
@@ -313,7 +313,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void HE16(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void HE16(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // horizontal
         offset--;
@@ -327,7 +327,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void DC16NoTop(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC16NoTop(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // DC with top samples not available.
         int dc = 8;
@@ -340,7 +340,7 @@ internal static class LossyUtils
         Put16(dc >> 4, dst);
     }
 
-    public static void DC16NoLeft(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC16NoLeft(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // DC with left samples not available.
         int dc = 8;
@@ -357,7 +357,7 @@ internal static class LossyUtils
     public static void DC16NoTopLeft(Span<byte> dst) =>
         Put16(0x80, dst); // DC with no top and left samples.
 
-    public static void DC8uv(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC8uv(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         int dc0 = 8;
         int offsetMinus1 = offset - 1;
@@ -388,7 +388,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void HE8uv(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void HE8uv(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // horizontal
         offset--;
@@ -403,7 +403,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void DC8uvNoTop(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC8uvNoTop(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // DC with no top samples.
         int dc0 = 4;
@@ -418,7 +418,7 @@ internal static class LossyUtils
         Put8x8uv((byte)(dc0 >> 3), dst);
     }
 
-    public static void DC8uvNoLeft(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC8uvNoLeft(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // DC with no left samples.
         int offsetMinusBps = offset - WebpConstants.Bps;
@@ -436,7 +436,7 @@ internal static class LossyUtils
     public static void DC8uvNoTopLeft(Span<byte> dst) =>
         Put8x8uv(0x80, dst); // DC with nothing.
 
-    public static void DC4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void DC4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         int dc = 4;
         int offsetMinusBps = offset - WebpConstants.Bps;
@@ -457,7 +457,7 @@ internal static class LossyUtils
     [MethodImpl(InliningOptions.ShortMethod)]
     public static void TM4(Span<byte> dst, Span<byte> yuv, int offset) => TrueMotion(dst, yuv, offset, 4);
 
-    public static void VE4(Span<byte> dst, Span<byte> yuv, int offset, Span<byte> vals)
+    public static void VE4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset, Span<byte> vals)
     {
         // vertical
         int topOffset = offset - WebpConstants.Bps;
@@ -472,7 +472,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void HE4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void HE4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // horizontal
         int offsetMinusOne = offset - 1;
@@ -491,7 +491,7 @@ internal static class LossyUtils
         BinaryPrimitives.WriteUInt32BigEndian(dst[(3 * WebpConstants.Bps)..], val);
     }
 
-    public static void RD4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void RD4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Down-right
         int offsetMinusOne = offset - 1;
@@ -528,7 +528,7 @@ internal static class LossyUtils
         Dst(dst, 3, 0, Avg3(d, c, b));
     }
 
-    public static void VR4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void VR4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Vertical-Right
         int offsetMinusOne = offset - 1;
@@ -565,7 +565,7 @@ internal static class LossyUtils
         Dst(dst, 3, 1, Avg3(b, c, d));
     }
 
-    public static void LD4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void LD4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Down-Left
         byte a = yuv[offset - WebpConstants.Bps];
@@ -600,7 +600,7 @@ internal static class LossyUtils
         Dst(dst, 3, 3, Avg3(g, h, h));
     }
 
-    public static void VL4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void VL4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Vertical-Left
         byte a = yuv[offset - WebpConstants.Bps];
@@ -636,7 +636,7 @@ internal static class LossyUtils
         Dst(dst, 3, 3, Avg3(f, g, h));
     }
 
-    public static void HD4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void HD4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Horizontal-Down
         byte i = yuv[offset - 1];
@@ -672,7 +672,7 @@ internal static class LossyUtils
         Dst(dst, 1, 3, Avg3(l, k, j));
     }
 
-    public static void HU4(Span<byte> dst, Span<byte> yuv, int offset)
+    public static void HU4(Span<byte> dst, ReadOnlySpan<byte> yuv, int offset)
     {
         // Horizontal-Up
         byte i = yuv[offset - 1];
@@ -705,7 +705,7 @@ internal static class LossyUtils
     /// <summary>
     /// Paragraph 14.3: Implementation of the Walsh-Hadamard transform inversion.
     /// </summary>
-    public static void TransformWht(Span<short> input, Span<short> output, Span<int> scratch)
+    public static void TransformWht(ReadOnlySpan<short> input, Span<short> output, Span<int> scratch)
     {
         Span<int> tmp = scratch[..16];
         tmp.Clear();
@@ -746,7 +746,7 @@ internal static class LossyUtils
     /// Returns the weighted sum of the absolute value of transformed coefficients.
     /// w[] contains a row-major 4 by 4 symmetric matrix.
     /// </summary>
-    public static int TTransform(Span<byte> input, Span<ushort> w, Span<int> scratch)
+    public static int TTransform(ReadOnlySpan<byte> input, Span<ushort> w, Span<int> scratch)
     {
         int sum = 0;
         Span<int> tmp = scratch[..16];
@@ -1249,7 +1249,7 @@ internal static class LossyUtils
         }
     }
 
-    public static void TransformDc(Span<short> src, Span<byte> dst)
+    public static void TransformDc(ReadOnlySpan<short> src, Span<byte> dst)
     {
         int dc = src[0] + 4;
         for (int j = 0; j < 4; j++)
@@ -1262,7 +1262,7 @@ internal static class LossyUtils
     }
 
     // Simplified transform when only src[0], src[1] and src[4] are non-zero
-    public static void TransformAc3(Span<short> src, Span<byte> dst)
+    public static void TransformAc3(ReadOnlySpan<short> src, Span<byte> dst)
     {
         int a = src[0] + 4;
         int c4 = Mul2(src[4]);
@@ -2133,7 +2133,7 @@ internal static class LossyUtils
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static bool NeedsFilter(Span<byte> p, int offset, int step, int t)
+    private static bool NeedsFilter(ReadOnlySpan<byte> p, int offset, int step, int t)
     {
         int p1 = p[offset + (-2 * step)];
         int p0 = p[offset - step];
@@ -2142,7 +2142,7 @@ internal static class LossyUtils
         return (4 * WebpLookupTables.Abs0(p0 - q0)) + WebpLookupTables.Abs0(p1 - q1) <= t;
     }
 
-    private static bool NeedsFilter2(Span<byte> p, int offset, int step, int t, int it)
+    private static bool NeedsFilter2(ReadOnlySpan<byte> p, int offset, int step, int t, int it)
     {
         int step2 = 2 * step;
         int step3 = 3 * step;
@@ -2357,7 +2357,7 @@ internal static class LossyUtils
         => Vector128_.SubtractSaturate(q, p) | Vector128_.SubtractSaturate(p, q);
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static bool Hev(Span<byte> p, int offset, int step, int thresh)
+    private static bool Hev(ReadOnlySpan<byte> p, int offset, int step, int thresh)
     {
         int p1 = p[offset - (2 * step)];
         int p0 = p[offset - step];

src/ImageSharp/Formats/Webp/Lossy/Vp8EncIterator.cs

@@ -854,7 +854,7 @@ internal class Vp8EncIterator
         }
     }
 
-    private static void ImportLine(Span<byte> src, int srcStride, Span<byte> dst, int len, int totalLen)
+    private static void ImportLine(ReadOnlySpan<byte> src, int srcStride, Span<byte> dst, int len, int totalLen)
     {
         int i;
         int srcIdx = 0;

src/ImageSharp/Formats/Webp/Lossy/Vp8EncProba.cs

@@ -234,7 +234,7 @@ internal class Vp8EncProba
 
     private static int CalcSkipProba(long nb, long total) => (int)(total != 0 ? (total - nb) * 255 / total : 255);
 
-    private static int VariableLevelCost(int level, Span<byte> probas)
+    private static int VariableLevelCost(int level, ReadOnlySpan<byte> probas)
     {
         int pattern = WebpLookupTables.Vp8LevelCodes[level - 1][0];
         int bits = WebpLookupTables.Vp8LevelCodes[level - 1][1];

src/ImageSharp/Formats/Webp/Lossy/Vp8Encoding.cs

@@ -599,7 +599,7 @@ internal static unsafe class Vp8Encoding
         Unsafe.As<short, Vector128<short>>(ref Unsafe.Add(ref outputRef, 8)) = d2f3.AsInt16();
     }
 
-    public static void FTransformWht(Span<short> input, Span<short> output, Span<int> scratch)
+    public static void FTransformWht(ReadOnlySpan<short> input, Span<short> output, Span<int> scratch)
     {
         Span<int> tmp = scratch[..16];
 
@@ -679,7 +679,7 @@ internal static unsafe class Vp8Encoding
 
     // Left samples are top[-5 .. -2], top_left is top[-1], top are
     // located at top[0..3], and top right is top[4..7]
-    public static void EncPredLuma4(Span<byte> dst, Span<byte> top, int topOffset, Span<byte> vals)
+    public static void EncPredLuma4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset, Span<byte> vals)
     {
         Dc4(dst[I4DC4..], top, topOffset);
         Tm4(dst[I4TM4..], top, topOffset);
@@ -764,7 +764,7 @@ internal static unsafe class Vp8Encoding
         }
     }
 
-    private static void DcMode(Span<byte> dst, Span<byte> left, Span<byte> top, int size, int round, int shift)
+    private static void DcMode(Span<byte> dst, Span<byte> left, ReadOnlySpan<byte> top, int size, int round, int shift)
     {
         int dc = 0;
         int j;
@@ -813,7 +813,7 @@ internal static unsafe class Vp8Encoding
         Fill(dst, dc, size);
     }
 
-    private static void Dc4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Dc4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         uint dc = 4;
         int i;
@@ -825,7 +825,7 @@ internal static unsafe class Vp8Encoding
         Fill(dst, (int)(dc >> 3), 4);
     }
 
-    private static void Tm4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Tm4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         Span<byte> clip = Clip1.AsSpan(255 - top[topOffset - 1]);
         for (int y = 0; y < 4; y++)
@@ -840,7 +840,7 @@ internal static unsafe class Vp8Encoding
         }
     }
 
-    private static void Ve4(Span<byte> dst, Span<byte> top, int topOffset, Span<byte> vals)
+    private static void Ve4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset, Span<byte> vals)
     {
         // vertical
         vals[0] = LossyUtils.Avg3(top[topOffset - 1], top[topOffset], top[topOffset + 1]);
@@ -853,7 +853,7 @@ internal static unsafe class Vp8Encoding
         }
     }
 
-    private static void He4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void He4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         // horizontal
         byte x = top[topOffset - 1];
@@ -872,7 +872,7 @@ internal static unsafe class Vp8Encoding
         BinaryPrimitives.WriteUInt32BigEndian(dst[(3 * WebpConstants.Bps)..], val);
     }
 
-    private static void Rd4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Rd4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte x = top[topOffset - 1];
         byte i = top[topOffset - 2];
@@ -907,7 +907,7 @@ internal static unsafe class Vp8Encoding
         LossyUtils.Dst(dst, 3, 0, LossyUtils.Avg3(d, c, b));
     }
 
-    private static void Vr4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Vr4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte x = top[topOffset - 1];
         byte i = top[topOffset - 2];
@@ -942,7 +942,7 @@ internal static unsafe class Vp8Encoding
         LossyUtils.Dst(dst, 3, 1, LossyUtils.Avg3(b, c, d));
     }
 
-    private static void Ld4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Ld4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte a = top[topOffset + 0];
         byte b = top[topOffset + 1];
@@ -976,7 +976,7 @@ internal static unsafe class Vp8Encoding
         LossyUtils.Dst(dst, 3, 3, LossyUtils.Avg3(g, h, h));
     }
 
-    private static void Vl4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Vl4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte a = top[topOffset + 0];
         byte b = top[topOffset + 1];
@@ -1011,7 +1011,7 @@ internal static unsafe class Vp8Encoding
         LossyUtils.Dst(dst, 3, 3, LossyUtils.Avg3(f, g, h));
     }
 
-    private static void Hd4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Hd4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte x = top[topOffset - 1];
         byte i = top[topOffset - 2];
@@ -1046,7 +1046,7 @@ internal static unsafe class Vp8Encoding
         LossyUtils.Dst(dst, 1, 3, LossyUtils.Avg3(l, k, j));
     }
 
-    private static void Hu4(Span<byte> dst, Span<byte> top, int topOffset)
+    private static void Hu4(Span<byte> dst, ReadOnlySpan<byte> top, int topOffset)
     {
         byte i = top[topOffset - 2];
         byte j = top[topOffset - 3];
@@ -1088,7 +1088,7 @@ internal static unsafe class Vp8Encoding
     private static byte Clip8b(int v) => (v & ~0xff) == 0 ? (byte)v : v < 0 ? (byte)0 : (byte)255;
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static void Store(Span<byte> dst, Span<byte> reference, int x, int y, int v) => dst[x + (y * WebpConstants.Bps)] = LossyUtils.Clip8B(reference[x + (y * WebpConstants.Bps)] + (v >> 3));
+    private static void Store(Span<byte> dst, ReadOnlySpan<byte> reference, int x, int y, int v) => dst[x + (y * WebpConstants.Bps)] = LossyUtils.Clip8B(reference[x + (y * WebpConstants.Bps)] + (v >> 3));
 
     [MethodImpl(InliningOptions.ShortMethod)]
     private static int Mul(int a, int b) => (a * b) >> 16;

src/ImageSharp/Formats/Webp/Lossy/Vp8Residual.cs

@@ -235,7 +235,7 @@ internal class Vp8Residual
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    private static int LevelCost(Span<ushort> table, int level)
+    private static int LevelCost(ReadOnlySpan<ushort> table, int level)
         => WebpLookupTables.Vp8LevelFixedCosts[level] + table[level > WebpConstants.MaxVariableLevel ? WebpConstants.MaxVariableLevel : level];
 
     private static int RecordStats(int bit, Vp8StatsArray statsArr, int idx)

src/ImageSharp/Formats/Webp/Lossy/Vp8SegmentInfo.cs

@@ -67,7 +67,7 @@ internal class Vp8SegmentInfo
 
     public int LambdaMode { get; set; }
 
-    public void StoreMaxDelta(Span<short> dcs)
+    public void StoreMaxDelta(ReadOnlySpan<short> dcs)
     {
         // We look at the first three AC coefficients to determine what is the average
         // delta between each sub-4x4 block.

src/ImageSharp/Formats/Webp/Lossy/YuvConversion.cs

@@ -39,7 +39,7 @@ internal static class YuvConversion
         }
     }
 
-    private static void UpSampleScalar(Span<byte> topY, Span<byte> bottomY, Span<byte> topU, Span<byte> topV, Span<byte> curU, Span<byte> curV, Span<byte> topDst, Span<byte> bottomDst, int len)
+    private static void UpSampleScalar(ReadOnlySpan<byte> topY, ReadOnlySpan<byte> bottomY, ReadOnlySpan<byte> topU, ReadOnlySpan<byte> topV, ReadOnlySpan<byte> curU, ReadOnlySpan<byte> curV, Span<byte> topDst, Span<byte> bottomDst, int len)
     {
         const int xStep = 3;
         int lastPixelPair = (len - 1) >> 1;
@@ -346,7 +346,7 @@ internal static class YuvConversion
     /// <param name="y">The destination span for y.</param>
     /// <param name="width">The width.</param>
     [MethodImpl(InliningOptions.ShortMethod)]
-    public static void ConvertRgbaToY(Span<Bgra32> rowSpan, Span<byte> y, int width)
+    public static void ConvertRgbaToY(ReadOnlySpan<Bgra32> rowSpan, Span<byte> y, int width)
     {
         for (int x = 0; x < width; x++)
         {
@@ -361,7 +361,7 @@ internal static class YuvConversion
     /// <param name="u">The destination span for u.</param>
     /// <param name="v">The destination span for v.</param>
     /// <param name="width">The width.</param>
-    public static void ConvertRgbaToUv(Span<ushort> rgb, Span<byte> u, Span<byte> v, int width)
+    public static void ConvertRgbaToUv(ReadOnlySpan<ushort> rgb, Span<byte> u, Span<byte> v, int width)
     {
         int rgbIdx = 0;
         for (int i = 0; i < width; i += 1, rgbIdx += 4)
@@ -372,7 +372,7 @@ internal static class YuvConversion
         }
     }
 
-    public static void AccumulateRgb(Span<Bgra32> rowSpan, Span<Bgra32> nextRowSpan, Span<ushort> dst, int width)
+    public static void AccumulateRgb(ReadOnlySpan<Bgra32> rowSpan, ReadOnlySpan<Bgra32> nextRowSpan, Span<ushort> dst, int width)
     {
         Bgra32 bgra0;
         Bgra32 bgra1;
@@ -416,7 +416,7 @@ internal static class YuvConversion
         }
     }
 
-    public static void AccumulateRgba(Span<Bgra32> rowSpan, Span<Bgra32> nextRowSpan, Span<ushort> dst, int width)
+    public static void AccumulateRgba(ReadOnlySpan<Bgra32> rowSpan, ReadOnlySpan<Bgra32> nextRowSpan, Span<ushort> dst, int width)
     {
         Bgra32 bgra0;
         Bgra32 bgra1;

src/ImageSharp/ImageSharp.csproj

@@ -30,12 +30,12 @@
   <Choose>
     <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
       <PropertyGroup>
-        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net11.0</TargetFrameworks>
       </PropertyGroup>
     </When>
     <Otherwise>
       <PropertyGroup>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
       </PropertyGroup>
     </Otherwise>
   </Choose>

src/ImageSharp/PixelFormats/PixelOperations{TPixel}.cs

@@ -412,7 +412,7 @@ public partial class PixelOperations<TPixel>
     }
 
     [MethodImpl(InliningOptions.ShortMethod)]
-    internal static void GuardUnpackIntoRgbPlanes(Span<float> redChannel, Span<float> greenChannel, Span<float> blueChannel, ReadOnlySpan<TPixel> source)
+    internal static void GuardUnpackIntoRgbPlanes(ReadOnlySpan<float> redChannel, Span<float> greenChannel, Span<float> blueChannel, ReadOnlySpan<TPixel> source)
     {
         Guard.IsTrue(greenChannel.Length == redChannel.Length, nameof(greenChannel), "Channels must be of same size!");
         Guard.IsTrue(blueChannel.Length == redChannel.Length, nameof(blueChannel), "Channels must be of same size!");

tests/Directory.Build.targets

@@ -23,7 +23,7 @@
       Magick.NET 14.15.0 disables WebP-compressed TIFF support on Windows.
       https://github.com/ImageMagick/tiff/commit/978181b6c999ee013f1b6df0a010d8c550d378cf
     -->
-    <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="14.14.0" />
+    <PackageReference Update="Magick.NET-Q16-AnyCPU" Version="14.16.0" />
     <PackageReference Update="Microsoft.DotNet.RemoteExecutor" Version="10.0.0-beta.25563.105" />
     <PackageReference Update="Moq" Version="4.20.72" />
     <PackageReference Update="NetVips" Version="3.0.0" />

tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj

@@ -39,12 +39,12 @@
   <Choose>
     <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
       <PropertyGroup>
-        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net11.0</TargetFrameworks>
       </PropertyGroup>
     </When>
     <Otherwise>
       <PropertyGroup>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
       </PropertyGroup>
     </Otherwise>
   </Choose>

tests/ImageSharp.PublicApi.Tests/ImageSharp.PublicApi.Tests.csproj

@@ -10,12 +10,12 @@
   <Choose>
     <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
       <PropertyGroup>
-        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net11.0</TargetFrameworks>
       </PropertyGroup>
     </When>
     <Otherwise>
       <PropertyGroup>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
       </PropertyGroup>
     </Otherwise>
   </Choose>

tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj

@@ -18,12 +18,12 @@
   <Choose>
     <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
       <PropertyGroup>
-        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net11.0</TargetFrameworks>
       </PropertyGroup>
     </When>
     <Otherwise>
       <PropertyGroup>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
       </PropertyGroup>
     </Otherwise>
   </Choose>

tests/ImageSharp.Tests/IO/LocalFileSystemTests.cs

@@ -50,7 +50,12 @@ public class LocalFileSystemTests
             await using (FileStream stream = (FileStream)fs.OpenReadAsynchronous(path))
             using (StreamReader reader = new(stream))
             {
+                // .NET 11 reports IsAsync false for regular files on Unix: https://github.com/dotnet/runtime/pull/125220
+#if NET11_0_OR_GREATER
+                Assert.Equal(OperatingSystem.IsWindows(), stream.IsAsync);
+#else
                 Assert.True(stream.IsAsync);
+#endif
                 Assert.True(stream.CanRead);
                 Assert.False(stream.CanWrite);
 
@@ -105,7 +110,12 @@ public class LocalFileSystemTests
             await using (FileStream stream = (FileStream)fs.CreateAsynchronous(path))
             await using (StreamWriter writer = new(stream))
             {
+                // .NET 11 reports IsAsync false for regular files on Unix: https://github.com/dotnet/runtime/pull/125220
+#if NET11_0_OR_GREATER
+                Assert.Equal(OperatingSystem.IsWindows(), stream.IsAsync);
+#else
                 Assert.True(stream.IsAsync);
+#endif
                 Assert.True(stream.CanRead);
                 Assert.True(stream.CanWrite);
 

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -12,12 +12,12 @@
   <Choose>
     <When Condition="$(SIXLABORS_TESTING_PREVIEW) == true">
       <PropertyGroup>
-        <TargetFrameworks>net8.0;net10.0</TargetFrameworks>
+        <TargetFrameworks>net10.0;net11.0</TargetFrameworks>
       </PropertyGroup>
     </When>
     <Otherwise>
       <PropertyGroup>
-        <TargetFrameworks>net8.0</TargetFrameworks>
+        <TargetFrameworks>net10.0</TargetFrameworks>
       </PropertyGroup>
     </Otherwise>
   </Choose>

tests/ImageSharp.Tests/TestUtilities/FeatureTesting/FeatureTestRunner.cs

@@ -414,7 +414,14 @@ public static class FeatureTestRunner
                     // Not a COMPlus value. We filter in calling method.
                     features.Add(key, nameof(HwIntrinsics.AllowAll));
                     break;
+#if NET11_0_OR_GREATER
+                case nameof(HwIntrinsics.DisableSSE42):
 
+                    // SSE3 through SSE4.2 and POPCNT are x86-64-v2 baseline in .NET 11+ and the
+                    // switch is inert, so skip it entirely rather than spawn a child that tests nothing.
+                    // https://learn.microsoft.com/en-us/dotnet/core/compatibility/jit/11/minimum-hardware-requirements
+                    break;
+#endif
                 default:
                     features.Add(key, intrinsic.Replace("Disable", "Enable"));
                     break;

tests/ImageSharp.Tests/TestUtilities/Tests/FeatureTestRunnerTests.cs

@@ -11,20 +11,25 @@ namespace SixLabors.ImageSharp.Tests.TestUtilities.Tests;
 
 public class FeatureTestRunnerTests
 {
-    public static TheoryData<HwIntrinsics, string[]> Intrinsics =>
+    public static TheoryData<HwIntrinsics, HwIntrinsics, string[]> Intrinsics =>
         new()
         {
-            { HwIntrinsics.DisableAES | HwIntrinsics.AllowAll, ["EnableAES", "AllowAll"] },
+            { HwIntrinsics.DisableAES | HwIntrinsics.AllowAll, HwIntrinsics.DisableAES | HwIntrinsics.AllowAll, ["EnableAES", "AllowAll"] },
-            { HwIntrinsics.DisableHWIntrinsic, ["EnableHWIntrinsic"] },
+            { HwIntrinsics.DisableHWIntrinsic, HwIntrinsics.DisableHWIntrinsic, ["EnableHWIntrinsic"] },
-            { HwIntrinsics.DisableSSE42 | HwIntrinsics.DisableAVX, ["EnableSSE42", "EnableAVX"] }
+#if NET11_0_OR_GREATER
+            // ToFeatureKeyValueCollection filters DisableSSE42: SSE4.2 is x86-64-v2 baseline in .NET 11+ and cannot be disabled.
+            { HwIntrinsics.DisableSSE42 | HwIntrinsics.DisableAVX, HwIntrinsics.DisableAVX, ["EnableAVX"] }
+#else
+            { HwIntrinsics.DisableSSE42 | HwIntrinsics.DisableAVX, HwIntrinsics.DisableSSE42 | HwIntrinsics.DisableAVX, ["EnableSSE42", "EnableAVX"] }
+#endif
         };
 
     [Theory]
     [MemberData(nameof(Intrinsics))]
-    public void ToFeatureCollectionReturnsExpectedResult(HwIntrinsics expectedIntrinsics, string[] expectedValues)
+    public void ToFeatureCollectionReturnsExpectedResult(HwIntrinsics intrinsics, HwIntrinsics expectedIntrinsics, string[] expectedValues)
     {
-        Dictionary<HwIntrinsics, string> features = expectedIntrinsics.ToFeatureKeyValueCollection();
+        Dictionary<HwIntrinsics, string> features = intrinsics.ToFeatureKeyValueCollection();
-        HwIntrinsics[] keys = features.Keys.ToArray();
+        HwIntrinsics[] keys = [.. features.Keys];
 
         HwIntrinsics actualIntrinsics = keys[0];
         for (int i = 1; i < keys.Length; i++)
@@ -122,9 +127,8 @@ public class FeatureTestRunnerTests
                     Assert.False(Ssse3.IsSupported, "Ssse3 should be disabled.");
                     Assert.False(Sse41.IsSupported, "Sse41 should be disabled.");
                     Assert.False(Popcnt.IsSupported, "Popcnt should be disabled.");
-#else
-                    Assert.False(Sse42.IsSupported, "Sse42 should be disabled when DisableSSE42 is set.");
 #endif
+                    Assert.False(Sse42.IsSupported, "Sse42 should be disabled when DisableSSE42 is set.");
                     break;
                 case HwIntrinsics.DisableAVX:
                     Assert.False(Avx.IsSupported, "AVX should be disabled when DisableAVX is set.");
@@ -169,12 +173,12 @@ public class FeatureTestRunnerTests
         {
             Assert.NotNull(serializable);
             Assert.NotNull(FeatureTestRunner.DeserializeForXunit<FakeSerializable>(serializable));
-            Assert.False(Sse42.IsSupported, "SSE42 should be disabled when DisableSSE42 is set (sanity check using serializable param overload).");
+            Assert.False(Avx.IsSupported, "AVX should be disabled when DisableAVX is set (sanity check using serializable param overload).");
         }
 
         FeatureTestRunner.RunWithHwIntrinsicsFeature(
             AssertHwIntrinsicsFeatureDisabled,
-            HwIntrinsics.DisableSSE42,
+            HwIntrinsics.DisableAVX,
             new FakeSerializable());
     }
 
@@ -256,7 +260,7 @@ public class FeatureTestRunnerTests
             }
         }
 
-        foreach (HwIntrinsics intrinsic in (HwIntrinsics[])Enum.GetValues(typeof(HwIntrinsics)))
+        foreach (HwIntrinsics intrinsic in Enum.GetValues<HwIntrinsics>())
         {
             FeatureTestRunner.RunWithHwIntrinsicsFeature(AssertHwIntrinsicsFeatureDisabled, intrinsic, new FakeSerializable());
         }