SixLabors · Erik-White · Feb 27, 2026 · Feb 27, 2026 · Feb 27, 2026 · Feb 27, 2026
diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
@@ -0,0 +1,12 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "sharpfuzz.commandline": {
+      "version": "2.0.2",
+      "commands": [
+        "sharpfuzz"
+      ]
+    }
+  }
+}
diff --git a/.gitattributes b/.gitattributes
@@ -126,6 +126,7 @@
 *.dds               filter=lfs diff=lfs merge=lfs -text
 *.ktx               filter=lfs diff=lfs merge=lfs -text
 *.ktx2              filter=lfs diff=lfs merge=lfs -text
+*.astc              filter=lfs diff=lfs merge=lfs -text
 *.pam               filter=lfs diff=lfs merge=lfs -text
 *.pbm               filter=lfs diff=lfs merge=lfs -text
 *.pgm               filter=lfs diff=lfs merge=lfs -text

diff --git a/.gitignore b/.gitignore
@@ -221,3 +221,9 @@ artifacts/
 
 # Tests
 **/Images/ActualOutput
+
+# Fuzz harness — libFuzzer-generated artefacts, per-target publish dirs, downloaded driver cache.
+tests/ImageSharp.Textures.FuzzTests/findings/
+tests/ImageSharp.Textures.FuzzTests/publish/
+tests/ImageSharp.Textures.FuzzTests/corpus/
+tests/ImageSharp.Textures.FuzzTests/.tools/
diff --git a/ImageSharp.Textures.sln b/ImageSharp.Textures.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.29613.14
+# Visual Studio Version 18
+VisualStudioVersion = 18.5.11716.220
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ImageSharp.Textures", "src\ImageSharp.Textures\ImageSharp.Textures.csproj", "{1588F6C4-2186-4A35-9693-E9F296791393}"
 EndProject
@@ -49,35 +49,78 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "workflows", "workflows", "{
 		.github\workflows\build-and-test.yml = .github\workflows\build-and-test.yml
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ImageSharp.Textures.FuzzTests", "tests\ImageSharp.Textures.FuzzTests\ImageSharp.Textures.FuzzTests.csproj", "{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}"
+EndProject
 Global
-	GlobalSection(SharedMSBuildProjectFiles) = preSolution
-		shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems*{1588f6c4-2186-4a35-9693-e9f296791393}*SharedItemsImports = 5
-		tests\Images\Images.projitems*{17fcbd4d-d232-45e8-876f-dfbc2fad52cf}*SharedItemsImports = 5
-		tests\Images\Images.projitems*{18be79b6-6b95-4ed7-a963-ad75f6cb9f3c}*SharedItemsImports = 5
-		tests\Images\Images.projitems*{68a8cc40-6aed-4e96-b524-31b1158fdeea}*SharedItemsImports = 13
-		tests\Images\Images.projitems*{b159ffd1-e646-42d0-892c-4abf69103712}*SharedItemsImports = 5
-	EndGlobalSection
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
 		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|x64.Build.0 = Debug|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Debug|x86.Build.0 = Debug|Any CPU
 		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|x64.ActiveCfg = Release|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|x64.Build.0 = Release|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|x86.ActiveCfg = Release|Any CPU
+		{1588F6C4-2186-4A35-9693-E9F296791393}.Release|x86.Build.0 = Release|Any CPU
 		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|x64.Build.0 = Debug|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Debug|x86.Build.0 = Debug|Any CPU
 		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|x64.ActiveCfg = Release|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|x64.Build.0 = Release|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|x86.ActiveCfg = Release|Any CPU
+		{B159FFD1-E646-42D0-892C-4ABF69103712}.Release|x86.Build.0 = Release|Any CPU
 		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|x64.Build.0 = Debug|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Debug|x86.Build.0 = Debug|Any CPU
 		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|x64.ActiveCfg = Release|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|x64.Build.0 = Release|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|x86.ActiveCfg = Release|Any CPU
+		{18BE79B6-6B95-4ED7-A963-AD75F6CB9F3C}.Release|x86.Build.0 = Release|Any CPU
 		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|x64.Build.0 = Debug|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Debug|x86.Build.0 = Debug|Any CPU
 		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|x64.ActiveCfg = Release|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|x64.Build.0 = Release|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|x86.ActiveCfg = Release|Any CPU
+		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF}.Release|x86.Build.0 = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|x64.Build.0 = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Debug|x86.Build.0 = Debug|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|x64.ActiveCfg = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|x64.Build.0 = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|x86.ActiveCfg = Release|Any CPU
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -90,8 +133,16 @@ Global
 		{17FCBD4D-D232-45E8-876F-DFBC2FAD52CF} = {6DF92068-B792-4038-8E3F-5FDF2E026BE7}
 		{E6224AB7-6987-4BA1-B2A6-ECFB7DA281DE} = {9F1F0B0F-704F-4B71-89EF-EE36042A27C9}
 		{9F19EBB4-32DB-4AFE-A5E4-722EDFAAE04B} = {E6224AB7-6987-4BA1-B2A6-ECFB7DA281DE}
+		{AB3955C1-C0BE-4B6E-84A2-32AB59DAB9CE} = {6DF92068-B792-4038-8E3F-5FDF2E026BE7}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {F1762A0D-74C4-454A-BCB7-C010BB067E58}
 	EndGlobalSection
+	GlobalSection(SharedMSBuildProjectFiles) = preSolution
+		shared-infrastructure\src\SharedInfrastructure\SharedInfrastructure.projitems*{1588f6c4-2186-4a35-9693-e9f296791393}*SharedItemsImports = 5
+		tests\Images\Images.projitems*{17fcbd4d-d232-45e8-876f-dfbc2fad52cf}*SharedItemsImports = 5
+		tests\Images\Images.projitems*{18be79b6-6b95-4ed7-a963-ad75f6cb9f3c}*SharedItemsImports = 5
+		tests\Images\Images.projitems*{68a8cc40-6aed-4e96-b524-31b1158fdeea}*SharedItemsImports = 13
+		tests\Images\Images.projitems*{b159ffd1-e646-42d0-892c-4abf69103712}*SharedItemsImports = 5
+	EndGlobalSection
 EndGlobal
diff --git a/README.md b/README.md
@@ -9,7 +9,7 @@ SixLabors.ImageSharp.Textures
 
 [![Build Status](https://img.shields.io/github/actions/workflow/status/SixLabors/ImageSharp.Textures/build-and-test.yml?branch=main)](https://github.com/SixLabors/ImageSharp.Textures/actions)
 [![Code coverage](https://codecov.io/gh/SixLabors/ImageSharp.Textures/branch/main/graph/badge.svg)](https://codecov.io/gh/SixLabors/ImageSharp)
-[![License: Apache 2.0](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![License: Six Labors Split](https://img.shields.io/badge/license-Six%20Labors%20Split-%23e30183)](https://github.com/SixLabors/ImageSharp/blob/main/LICENSE)
 [![Twitter](https://img.shields.io/twitter/url/http/shields.io.svg?style=flat&logo=twitter)](https://twitter.com/intent/tweet?hashtags=imagesharp,dotnet,oss&text=ImageSharp.+A+new+cross-platform+2D+graphics+API+in+C%23&url=https%3a%2f%2fgithub.com%2fSixLabors%2fImageSharp&via=sixlabors)
 
 </div>
@@ -33,6 +33,7 @@ with the following compressions:
 - BC5
 - BC6H
 - BC7
+- ASTC
 
 Encoding textures is **not** yet supported. PR are of course very welcome.
 

diff --git a/shared-infrastructure b/shared-infrastructure
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
@@ -11,7 +11,7 @@
   -->
 
   <!-- Import the shared src .props file -->
-  <Import Project="$(MSBuildThisFileDirectory)..\shared-infrastructure\msbuild\props\SixLabors.Src.props" />
+  <Import Project="$(MSBuildThisFileDirectory)../shared-infrastructure/msbuild/props/SixLabors.Src.props" />
 
   <!-- Import the solution .props file. -->
   <Import Project="$(MSBuildThisFileDirectory)..\Directory.Build.props" />
@@ -22,9 +22,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <InternalsVisibleTo Include="SixLabors.ImageSharp.Textures.Benchmarks" Key="$(SixLaborsPublicKey)" />
+    <InternalsVisibleTo Include="ImageSharp.Textures.Benchmarks" Key="$(SixLaborsPublicKey)" />
     <InternalsVisibleTo Include="SixLabors.ImageSharp.Textures.InteractiveTest" Key="$(SixLaborsPublicKey)" />
     <InternalsVisibleTo Include="SixLabors.ImageSharp.Textures.Tests" Key="$(SixLaborsPublicKey)" />
+    <InternalsVisibleTo Include="SixLabors.ImageSharp.Textures.FuzzTests" Key="$(SixLaborsPublicKey)" />
   </ItemGroup>
 
 </Project>
diff --git a/src/ImageSharp.Textures/Common/Helpers/FloatHelper.cs b/src/ImageSharp.Textures/Common/Helpers/FloatHelper.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System;
 using System.Runtime.CompilerServices;
 
 namespace SixLabors.ImageSharp.Textures.Common.Helpers
@@ -14,32 +15,31 @@ internal static class FloatHelper
         public static uint PackFloatToFloat32(float value) => Unsafe.As<float, uint>(ref value);
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static float UnpackFloat16ToFloat(uint value)
-        {
-            uint result =
-                ((value >> 15) << 31) |
-                ((((value >> 10) & 0x1f) - 15 + 127) << 23) |
-                ((value & 0x3ff) << 13);
-            return Unsafe.As<uint, float>(ref result);
-        }
+        public static float UnpackFloat16ToFloat(uint value) => (float)BitConverter.UInt16BitsToHalf((ushort)value);
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static uint PackFloatToFloat16(float value)
-        {
-            uint temp = Unsafe.As<float, uint>(ref value);
-            return
-                ((temp >> 31) << 15) |
-                ((((temp >> 23) & 0xff) - 127 + 15) << 10) |
-                ((temp & 0x7fffff) >> 13);
-        }
+        public static uint PackFloatToFloat16(float value) => BitConverter.HalfToUInt16Bits((Half)value);
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static float UnpackFloat10ToFloat(uint value)
+        public static float UnpackFloat10ToFloat(uint value, uint bias = 10)
         {
-            uint result =
-                ((((value >> 5) & 0x1f) - 10 + 127) << 23) |
-                ((value & 0x1f) << 18);
-            return Unsafe.As<uint, float>(ref result);
+            uint e = (value >> 5) & 0x1Fu;
+            uint m = value & 0x1Fu;
+
+            return e switch
+            {
+                // Zero
+                0 when m == 0 => 0f,
+
+                // Denormalized
+                0 => m * BitConverter.UInt32BitsToSingle((128u - bias - 5u) << 23),
+
+                // Inf/NaN
+                31 => BitConverter.UInt32BitsToSingle((0xFFu << 23) | (m << 18)),
+
+                // Normalized
+                _ => BitConverter.UInt32BitsToSingle(((e + 127u - bias) << 23) | (m << 18)),
+            };
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -52,12 +52,29 @@ public static uint PackFloatToFloat10(float value)
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static float UnpackFloat11ToFloat(uint value)
+        public static float UnpackFloat11ToFloat(uint value, uint bias = 11)
         {
-            uint result =
-                ((((value >> 6) & 0x1f) - 11 + 127) << 23) |
-                ((value & 0x3f) << 17);
-            return Unsafe.As<uint, float>(ref result);
+            uint e = (value >> 6) & 0x1Fu;
+            uint m = value & 0x3Fu;
+
+            if (e == 0)
+            {
+                if (m == 0)
+                {
+                    return 0f;
+                }
+
+                // Denormalized: m * 2^(1 - bias - 6)
+                return m * BitConverter.UInt32BitsToSingle((128u - bias - 6u) << 23);
+            }
+
+            if (e == 31)
+            {
+                uint ieee = (0xFFu << 23) | (m << 17);
+                return BitConverter.UInt32BitsToSingle(ieee);
+            }
+
+            return BitConverter.UInt32BitsToSingle(((e + 127u - bias) << 23) | (m << 17));
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]