Implement support for ASTC compressed KTX textures by Erik-White · Pull Request #37 · SixLabors/ImageSharp.Textures

Erik-White · 2026-02-27T12:58:18Z

Prerequisites

I have written a descriptive pull-request title
I have verified that there are no overlapping pull-requests open
I have verified that I am following the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
I have provided test coverage for my change (where applicable)

Description

Adds support for decoding ASTC compressed KTX and KTX2 textures, including both LDR and HDR modes. Implementing an ASTC decoder was a major challenge, but I was able to base a lot of it on existing C++ implementations from ARM and Khronos.

ASTC is very complex, with different combinations of modes, block sizes and partitions, so I'm afraid that the diff is very large.

I have added tests that compare the output vs the ARM C++ implementation to ensure correctness.

Decoding speed compares favorably to the reference decoder (see below)

Limitations

No support for 3D ASTC block types (4x4x4 etc)
No encoding

Intentionally omitted

Float output for HDR (doesn't appear to be useful for ImageSharp.Textures, but would be trivial to implement)
Swizzle remapping (also not useful for ImageSharp.Textures, can be handled downstream)
sRGB containers decode to raw UNORM8 (conversion is handled downstream)

Test data

Everything used is either created by myself, or sourced from
https://github.com/KhronosGroup/KTX-Software (Apache 2.0 license)
https://github.com/KhronosGroup/KTX-Software-CTS (Apache 2.0 license)
https://github.com/ARM-software/astc-encoder (Apache-2.0 license)

Performance

This implementation compares very favourably to the ARM C++ implementation. Single shot benchmarks show 3-4 faster on this small test set:

| Method         | Categories | Mean      | Error     | StdDev    | Ratio | RatioSD | Allocated | Alloc Ratio |
|--------------- |----------- |----------:|----------:|----------:|------:|--------:|----------:|------------:|
| Reference_Hdr  | HDR        |  7.118 ms | 0.1379 ms | 0.1588 ms |  1.00 |    0.03 |     460 B |        1.00 |
| ImageSharp_Hdr | HDR        |  1.932 ms | 0.0113 ms | 0.0100 ms |  0.27 |    0.01 |     288 B |        0.63 |
|                |            |           |           |           |       |         |           |             |
| Reference_Ldr  | LDR        | 10.584 ms | 0.1662 ms | 0.1473 ms |  1.00 |    0.02 |     616 B |        1.00 |
| ImageSharp_Ldr | LDR        |  2.756 ms | 0.0524 ms | 0.0539 ms |  0.26 |    0.01 |     384 B |        0.62 |

...however this includes the allocation overhead of the ARM decoder. Re-using the same decoder context in the ARM decoder shows a probably more realistic comparison:

| Method         | Categories | Mean       | Error    | StdDev   | Ratio | RatioSD | Allocated | Alloc Ratio |
|--------------- |----------- |-----------:|---------:|---------:|------:|--------:|----------:|------------:|
| Reference_Hdr  | HDR        |   943.3 us | 11.18 us | 10.46 us |  1.00 |    0.02 |         - |          NA |
| ImageSharp_Hdr | HDR        | 1,927.2 us | 10.61 us |  9.92 us |  2.04 |    0.02 |     288 B |          NA |
|                |            |            |          |          |       |         |           |             |
| Reference_Ldr  | LDR        | 2,390.6 us | 16.59 us | 13.86 us |  1.00 |    0.01 |         - |          NA |
| ImageSharp_Ldr | LDR        | 2,726.7 us | 36.61 us | 34.25 us |  1.14 |    0.02 |     384 B |          NA |

Erik-White · 2026-02-27T21:13:17Z

+            return (ulong)FloatHelper.PackFloatToFloat16(vector.X)
+                | ((ulong)FloatHelper.PackFloatToFloat16(vector.Y) << 16)
+                | ((ulong)FloatHelper.PackFloatToFloat16(vector.Z) << 32)
+                | ((ulong)FloatHelper.PackFloatToFloat16(vector.W) << 48);


Casting to unit could result in an overflow when shifting. Widening to a long allows for correct shifting without overflow

Erik-White · 2026-02-27T21:16:52Z

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>


AstcEncoderCSharp only supports .NET10 so I kept this in a separate test project. It is very useful to be able to compare output directly with the ARM implementation.

Erik-White · 2026-03-01T11:02:07Z

@brianpopow Hopefully this is now structured in a way that fits well with rest of the project. I'm afraid that it ends up being a massive PR though, mainly due to the complexity of ASTC.

brianpopow · 2026-03-05T17:43:57Z

@brianpopow Hopefully this is now structured in a way that fits well with rest of the project. I'm afraid that it ends up being a massive PR though, mainly due to the complexity of ASTC.

Thank @Erik-White for your effort here, it is highly appreciated, it really is a huge PR. If the reference to AstcSharp is removed now, I think this is now mergeable.

Unfortunately I do not have the capacity currently to do a proper review (not only because of time, but also because I do not know ASTC well enough).

@JimBobSquarePants what do you think, would you find some time to review this PR?

JimBobSquarePants · 2026-03-06T10:38:32Z

@brianpopow Hopefully this is now structured in a way that fits well with rest of the project. I'm afraid that it ends up being a massive PR though, mainly due to the complexity of ASTC.

Thank @Erik-White for your effort here, it is highly appreciated, it really is a huge PR. If the reference to AstcSharp is removed now, I think this is now mergeable.

Unfortunately I do not have the capacity currently to do a proper review (not only because of time, but also because I do not know ASTC well enough).

@JimBobSquarePants what do you think, would you find some time to review this PR?

Not just now unfortunately. I'm day and night on a massive PR to the Drawing library. I've set Copilot to review it just now though to see if there's any obvious issues.

Copilot

Pull request overview

Adds ASTC decoding support across KTX/KTX2 (including HDR paths) and expands test coverage + assets to validate correctness against reference decoders.

Changes:

Introduces ASTC decoding implementation (core/block decode/BISE utilities) and new texture format decoders.
Adds extensive new test inputs/reference outputs plus new ASTC/KTX/KTX2 test suites (including HDR-specific tests).
Updates test/benchmark infrastructure to support grouping outputs and new test formats/tools.

Reviewed changes

Copilot reviewed 273 out of 350 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_4x4.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_12x12.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_12x10.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_10x8.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_10x6.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_10x5.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes_10x10.png	Adds reference output (LFS) for KTX2 ASTC decode verification
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_MipMaps_4.png	Adds reference output (LFS) for KTX2 ASTC mipmaps test
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_MipMaps_3.png	Adds reference output (LFS) for KTX2 ASTC mipmaps test
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_MipMaps_2.png	Adds reference output (LFS) for KTX2 ASTC mipmaps test
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_MipMaps_1.png	Adds reference output (LFS) for KTX2 ASTC mipmaps test
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderFlatTests/CanDecode_MipMaps_0.png	Adds reference output (LFS) for KTX2 ASTC mipmaps test
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_posZ.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_posY.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_posX.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_negZ.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_negY.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx2/Ktx2AstcDecoderCubemapTests/CanDecode_All_Faces_negX.png	Adds reference output (LFS) for KTX2 ASTC cubemap face
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RGBA64F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RGBA128F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RGB96F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RGB48F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RG64F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_RG32F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_R32F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxHdrDecoderFlatTests/CanDecode_R16F.png	Adds reference output (LFS) for KTX HDR decode test
tests/Images/ReferenceOutput/Ktx/KtxAstcDecoderFlatTests/CanDecode_Rgba32_Blocksizes.png	Adds reference output (LFS) for KTX ASTC decode test
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_8x8.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_8x6.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_8x5.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_6x6.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_6x5.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_5x5.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_5x4.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_4x4.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_12x12.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_12x10.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_10x8.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_10x6.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_10x5.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/LogicalAstcBlockTests/UnpackLogicalBlock_FromImage_ShouldDecodeCorrectly_10x10.png	Adds reference output (LFS) for ASTC logical block tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbaFile_ShouldMatchExpected_8x8.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbaFile_ShouldMatchExpected_6x6.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbaFile_ShouldMatchExpected_5x5.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbaFile_ShouldMatchExpected_4x4.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbFile_ShouldMatchExpected_8x8.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbFile_ShouldMatchExpected_6x6.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbFile_ShouldMatchExpected_5x4.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbFile_ShouldMatchExpected_4x4.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/ReferenceOutput/Astc/AstcDecoderTests/DecompressImage_WithAstcRgbFile_ShouldMatchExpected_12x12.png	Adds reference output (LFS) for ASTC image decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x8_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x8_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x6_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x6_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x5_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_8x5_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_6x6_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_6x6_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_6x5_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_6x5_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_5x5_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_5x5_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_5x4_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_5x4_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_4x4_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_4x4_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_12x12_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_12x12_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_12x10_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_12x10_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x8_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x8_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x6_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x6_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x5_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x5_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x10_UNORM_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/valid_ASTC_10x10_SRGB_BLOCK_2D.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_8x8.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_8x6.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_8x5.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_6x6.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_6x5.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_5x5.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_5x4.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_4x4.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_12x12.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_12x10.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_10x8.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_10x6.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_10x5.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_rgba32_10x10.ktx2	Adds input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx2/Flat/Astc/astc_ldr_6x6_arraytex_7_mipmap.ktx2	Adds input (LFS) for KTX2 ASTC array+mipmaps tests
tests/Images/Input/Ktx2/Flat/Astc/astc_ldr_10x5_FlightHelmet_baseColor.ktx2	Adds input (LFS) for real-world KTX2 ASTC sample test
tests/Images/Input/Ktx2/Flat/Astc/Supercompressed/valid_ASTC_4x4_UNORM_BLOCK_2D_ZSTD_9.ktx2	Adds input (LFS) for KTX2 ASTC supercompression tests
tests/Images/Input/Ktx2/Flat/Astc/Supercompressed/valid_ASTC_4x4_UNORM_BLOCK_2D_ZSTD_1.ktx2	Adds input (LFS) for KTX2 ASTC supercompression tests
tests/Images/Input/Ktx2/Flat/Astc/Supercompressed/valid_ASTC_4x4_UNORM_BLOCK_2D_ZLIB_9.ktx2	Adds input (LFS) for KTX2 ASTC supercompression tests
tests/Images/Input/Ktx2/Flat/Astc/Supercompressed/valid_ASTC_4x4_UNORM_BLOCK_2D_ZLIB_1.ktx2	Adds input (LFS) for KTX2 ASTC supercompression tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rgba64-unorm.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rgba128-sfloat.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rgb9e5-ufloat.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rgb96-sfloat.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rgb48-unorm.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rg64-sfloat.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-rg32-unorm.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-r32-sfloat.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-r16-unorm.ktx2	Adds HDR input (LFS) for KTX2 ASTC HDR decode tests
tests/Images/Input/Ktx2/Flat/Astc/HDR/hdr-b10g11r11-ufloat.ktx2	Adds HDR input (LFS) for KTX2 packed-float decode tests
tests/Images/Input/Ktx2/Cubemap/Astc/astc_ldr_cubemap_6x6.ktx2	Adds cubemap input (LFS) for KTX2 ASTC decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rgba64.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rgba128.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rgb96.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rgb48.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rg64.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-rg32.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-r32.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/HDR/hdr-r16.ktx	Adds HDR input (LFS) for KTX v1 HDR decode tests
tests/Images/Input/Ktx/Flat/Astc/astc-rgba32-8x8.ktx	Adds ASTC input (LFS) for KTX v1 decode tests
tests/Images/Input/Astc/rgba_8x8.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgba_6x6.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgba_5x5.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgba_4x4.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgb_8x8.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgb_6x6.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgb_5x4.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgb_4x4.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/rgb_12x12.astc	Adds raw ASTC input (LFS) for direct ASTC decoder tests
tests/Images/Input/Astc/footprint_8x8.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_8x6.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_8x5.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_6x6.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_6x5.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_5x5.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_5x4.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_4x4.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_12x12.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_12x10.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_10x8.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_10x6.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_10x5.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/footprint_10x10.astc	Adds raw ASTC input (LFS) for footprint/decoding tests
tests/Images/Input/Astc/checkered_9.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_8.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_7.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_6.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_5.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_4.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_12.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_11.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkered_10.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/checkerboard.astc	Adds raw ASTC input (LFS) for decoder tests
tests/Images/Input/Astc/HDR/ldr-tile.astc	Adds raw ASTC input (LFS) for HDR/LDR crossover tests
tests/Images/Input/Astc/HDR/hdr.exr	Adds HDR source (LFS) for reference/comparison in HDR tests
tests/Images/Input/Astc/HDR/hdr-tile.astc	Adds raw ASTC input (LFS) for HDR decode tests
tests/Images/Input/Astc/HDR/hdr-complex.exr	Adds HDR source (LFS) for reference/comparison in HDR tests
tests/Images/Input/Astc/HDR/LDR-A-1x1.png	Adds LDR reference image (LFS) for HDR-related tests
tests/Images/Input/Astc/HDR/LDR-A-1x1.astc	Adds raw ASTC input (LFS) for HDR-related tests
tests/Images/Input/Astc/HDR/HDR-A-1x1.exr	Adds HDR reference image (LFS) for HDR-related tests
tests/Images/Input/Astc/HDR/HDR-A-1x1.astc	Adds raw ASTC input (LFS) for HDR-related tests
tests/ImageSharp.Textures.Tests/TestUtilities/TextureProviders/TestTextureProvider.cs	Enhances test provider to support grouped output naming
tests/ImageSharp.Textures.Tests/TestUtilities/Attributes/WithFileAttribute.cs	Updates file discovery to support subpaths and group output folders
tests/ImageSharp.Textures.Tests/Formats/Ktx2/Ktx2AstcDecoderCubemapTests.cs	Adds KTX2 ASTC cubemap decoder tests
tests/ImageSharp.Textures.Tests/Formats/Ktx/KtxDecoderTests.cs	Adjusts test grouping and renames test method for consistency
tests/ImageSharp.Textures.Tests/Formats/Ktx/KtxAstcDecoderFlatTests.cs	Adds KTX v1 ASTC flat texture decode tests
tests/ImageSharp.Textures.Tests/Formats/Astc/WeightInfillTests.cs	Adds unit tests for BISE weight bit counts and weight infill
tests/ImageSharp.Textures.Tests/Formats/Astc/HDR/Rgba64ExtensionsTests.cs	Adds tests for HDR helper extensions
tests/ImageSharp.Textures.Tests/Formats/Astc/HDR/HdrImageTests.cs	Adds HDR end-to-end ASTC decode tests for real sample files
tests/ImageSharp.Textures.Tests/Formats/Astc/HDR/HdrDecoderTests.cs	Adds HDR decoder API tests and invariants
tests/ImageSharp.Textures.Tests/Formats/Astc/FootprintTests.cs	Adds footprint mapping/equality tests
tests/ImageSharp.Textures.Tests/Formats/Astc/BitStreamTests.cs	Adds bitstream unit tests
tests/ImageSharp.Textures.Tests/Formats/Astc/BitOperationsTests.cs	Adds bit operations unit tests
tests/ImageSharp.Textures.Tests/Enums/TestTextureTool.cs	Adds AstcEnc test tool enum value
tests/ImageSharp.Textures.Tests/Enums/TestTextureFormat.cs	Adds Astc test format enum value
tests/ImageSharp.Textures.InteractiveTest/ImageSharp.Textures.InteractiveTest.csproj	Suppresses strong-name warnings for interactive test deps
tests/ImageSharp.Textures.Benchmarks/Program.cs	Converts to file-scoped namespace
tests/ImageSharp.Textures.Benchmarks/ImageSharp.Textures.Benchmarks.csproj	Adds nullable and project reference; removes extra packages
tests/ImageSharp.Textures.Benchmarks/Config.cs	Converts to file-scoped namespace and expression-bodied members
tests/ImageSharp.Textures.Benchmarks/AstcImageDecodeBenchmark.cs	Adds low-level ASTC decode benchmark
tests/ImageSharp.Textures.Benchmarks/AstcDecodingBenchmark.cs	Adds ASTC parsing/endpoint/partition benchmarks
tests/ImageSharp.Textures.Astc.Reference.Tests/ImageSharp.Textures.Astc.Reference.Tests.csproj	Adds reference-based ASTC correctness test project
tests/Directory.Build.targets	Updates test dependency versions
tests/Directory.Build.props	Fixes import path formatting
src/ImageSharp.Textures/TextureFormats/Decoding/Rgbe9995PackedFloat.cs	Adds VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 decoder
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc8x8.cs	Adds ASTC 8x8 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc8x6.cs	Adds ASTC 8x6 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc8x5.cs	Adds ASTC 8x5 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc6x6.cs	Adds ASTC 6x6 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc6x5.cs	Adds ASTC 6x5 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc5x5.cs	Adds ASTC 5x5 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc5x4.cs	Adds ASTC 5x4 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc4x4.cs	Adds ASTC 4x4 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc12x12.cs	Adds ASTC 12x12 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc12x10.cs	Adds ASTC 12x10 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc10x8.cs	Adds ASTC 10x8 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc10x6.cs	Adds ASTC 10x6 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc10x5.cs	Adds ASTC 10x5 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/RgbaAstc10x10.cs	Adds ASTC 10x10 decoder block
src/ImageSharp.Textures/TextureFormats/Decoding/Rgb48Float.cs	Adds RGB 16-bit-float-per-channel block support
src/ImageSharp.Textures/TextureFormats/Decoding/Rgb111110PackedFloat.cs	Adds VK_FORMAT_B10G11R11_UFLOAT_PACK32 decoder
src/ImageSharp.Textures/PixelFormats/Fp32.cs	Fixes float packing and implements ToRgba32 conversion
src/ImageSharp.Textures/ImageSharp.Textures.csproj	Adds AstcSharp package dependency
src/ImageSharp.Textures/Formats/Ktx2/Ktx2DecoderCore.cs	Adjusts KTX2 stream consumption behavior after decoding
src/ImageSharp.Textures/Formats/Ktx/SwappingEndianHandler.cs	Adds endian swapping implementation for KTX v1
src/ImageSharp.Textures/Formats/Ktx/NativeEndianHandler.cs	Adds native-endian implementation for KTX v1
src/ImageSharp.Textures/Formats/Ktx/IEndianHandler.cs	Introduces endian handler abstraction for KTX v1
src/ImageSharp.Textures/Formats/Ktx/Enums/GlInternalPixelFormat.cs	Adds float/HDR internal formats and ASTC enums
src/ImageSharp.Textures/Compression/Astc/TexelBlock/PhysicalBlockMode.cs	Adds ASTC block mode enum
src/ImageSharp.Textures/Compression/Astc/TexelBlock/PhysicalBlock.cs	Adds physical block wrapper around BlockInfo decoding
src/ImageSharp.Textures/Compression/Astc/README.md	Documents ASTC decoder background and features
src/ImageSharp.Textures/Compression/Astc/IO/BitStream.cs	Adds 128-bit bitstream helper
src/ImageSharp.Textures/Compression/Astc/IO/AstcFileHeader.cs	Adds ASTC file header parsing
src/ImageSharp.Textures/Compression/Astc/IO/AstcFile.cs	Adds ASTC file wrapper + footprint mapping
src/ImageSharp.Textures/Compression/Astc/Core/UInt128Extensions.cs	Adds UInt128 helper methods
src/ImageSharp.Textures/Compression/Astc/Core/Rgba64Extensions.cs	Adds HDR color helpers
src/ImageSharp.Textures/Compression/Astc/Core/Rgba32Extensions.cs	Adds LDR color helpers
src/ImageSharp.Textures/Compression/Astc/Core/FootprintType.cs	Adds footprint type enum
src/ImageSharp.Textures/Compression/Astc/Core/Footprint.cs	Adds footprint abstraction and mapping helpers
src/ImageSharp.Textures/Compression/Astc/Core/DecimationTable.cs	Adds cached decimation + weight infill logic
src/ImageSharp.Textures/Compression/Astc/Core/DecimationInfo.cs	Adds decimation metadata container
src/ImageSharp.Textures/Compression/Astc/Core/BitOperations.cs	Adds ASTC slice/precision-transfer helpers
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/RgbaColorExtensions.cs	Adds ASTC-specific RGB(A) color transforms
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/EndpointEncodingModeExtensions.cs	Adds endpoint-mode-to-value-count mapping
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/EndpointEncodingMode.cs	Adds endpoint encoding mode enum
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/ColorEndpointPair.cs	Adds LDR/HDR endpoint pair union type
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/ColorEndpointModeExtensions.cs	Adds endpoint mode helpers incl. HDR detection
src/ImageSharp.Textures/Compression/Astc/ColorEncoding/ColorEndpointMode.cs	Adds endpoint mode enum definitions
src/ImageSharp.Textures/Compression/Astc/BlockDecoder/FusedLdrBlockDecoder.cs	Adds optimized fused LDR decode path
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/Quantize/TritQuantizationMap.cs	Adds trit quantization map generation
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/Quantize/QuintQuantizationMap.cs	Adds quint quantization map generation
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/Quantize/QuantizationMap.cs	Adds base quantization map + freezing
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/Quantize/BitQuantizationMap.cs	Adds bit-only quantization map generation
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/BoundedIntegerSequenceEncoder.cs	Adds BISE encoder implementation
src/ImageSharp.Textures/Compression/Astc/BiseEncoding/BiseEncodingMode.cs	Defines BISE encoding modes
src/ImageSharp.Textures/Common/Helpers/FloatHelper.cs	Improves float packing/unpacking correctness and adds bias support
src/Directory.Build.props	Updates InternalsVisibleTo entries for benchmarks & reference tests
README.md	Updates license badge and lists ASTC support
.gitattributes	Adds .astc to Git LFS filters

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Erik-White · 2026-03-24T10:05:03Z

It looks like @JimBobSquarePants you're still working away on that mega Drawing PR - is there anyone else from the ImageSharp team who might be able to take a look at this? Is there anything else I can do to help?

JimBobSquarePants · 2026-03-26T01:06:47Z

It looks like @JimBobSquarePants you're still working away on that mega Drawing PR - is there anyone else from the ImageSharp team who might be able to take a look at this? Is there anything else I can do to help?

Yeah, I'm still utterly swamped I'm afraid. It's likely a few months before I can take a proper look at the library.

Erik-White · 2026-05-16T17:39:05Z

I have added tests that compare the output vs the ARM C++ implementation to ensure correctness (see ImageSharp.Textures.Astc.Reference.Tests), however this had to be a separate test project because the C# bindings wrapper (AstcEncoderCSharp) only supports .NET10.

A separate project will not run during our CI testing unless explicitly specified. CAn we run against reference output rather than the libraray directly?

The author of that package accepted my PR so it now supports .NET8, and I was able to integrate the reference tests in the main test project.

Erik-White · 2026-05-16T17:44:20Z

I have completely refactored the decoder and it is in a much better state now.
As I mentioned, I will now try to break it down to smaller pieces that are easier to handle and post them as separate PRs.

Erik-White added 2 commits February 27, 2026 13:55

Add ASTC decoding support

6577b4c

Integrate AstcSharp ASTC decoder

6e58d6f

Erik-White marked this pull request as draft February 27, 2026 13:00

Erik-White added 2 commits February 27, 2026 15:11

Use existing test utils for Astc tests

0aba876

Add HDR support

44599c8

Erik-White mentioned this pull request Feb 27, 2026

Add support for ASTC compressed KTX textures #35

Closed

4 tasks

Erik-White added 2 commits February 27, 2026 17:53

Fix overflow issue

724bd61

Move KTX1 test images to subdirectories

abd3b4c

Erik-White marked this pull request as ready for review February 27, 2026 16:56

Erik-White commented Feb 27, 2026

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Comment thread .gitattributes

Erik-White commented Feb 27, 2026

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Comment thread tests/ImageSharp.Textures.Tests/Formats/Astc/HDR/HdrComparisonTests.cs Outdated

Erik-White changed the title ~~Implement ASTC decoding with integrated decoder~~ Implement support for ASTC compressed KTX textures Mar 1, 2026

brianpopow reviewed Mar 5, 2026

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Comment thread src/ImageSharp.Textures/ImageSharp.Textures.csproj Outdated

JimBobSquarePants requested a review from Copilot March 6, 2026 10:37

Copilot AI reviewed Mar 6, 2026

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Erik-White added 3 commits March 6, 2026 16:00

Remove unused AstcSharp reference

86ff81a

Small fixes and variable naming

94d0f72

Astc files are little endian

e7ce5fa

Erik-White mentioned this pull request Mar 6, 2026

Add astc files so they are checked in with LFS SixLabors/SharedInfrastructure#56

Merged

4 tasks

Erik-White added 2 commits March 6, 2026 18:11

Update shared infra

1d3acec

Add more defensive checks for ASTC input

438959e

Erik-White added 2 commits May 9, 2026 15:58

Remove unused decoder overload

fd19b63

Use correct pixel format for VK_FORMAT_R16G16B16A16_SFLOAT

58814e5

Erik-White added 28 commits May 15, 2026 10:04

Add fuzzing tests with FuzzSharp

4704375

Add support for fuzzing with libfuzzer

cb7bf3e

Increase fuzzing coverage

06e8257

Use ImageSharp guards

4487d89

Remove old reference tests project

ab09b5b

Rename HDR namespace to titlecase for consistency

6fa49d9

Merge branch 'main' into implement-astc-decoding

11758b9

Reorganize test data for consistency

8e244ec

Add stream based overloads for AstcDecoder

cae17ca

Use ImageSharp allocator

845b24e

Improve ktx1 ASTC test coverage

c0ff0f6

Fix off-by-one error in LDR quantization

100aa5c

Revise doc references and include sources in repo

e999744

Make sure to dispose images in tests

35c78e2

Fix race in test output paths

91317c6

Consolidate Hdr properties for BlockInfo

d916af9

Clean up redundant code in DecompressImage

6bf7b5a

Use integer maths for scale factor

31a9def

Simplify partition cache key

4933ec1

BlockModeDecoder lookup tables should be static

d8ddf54

Enforce read only properties where possible

07efe2d

Remove remaining encoding related code

270bdd1

Use centralized value for channel count

83c761c

Remove redundant argument name parameters

060af19

Combine and simplify reference benchmark cases

7e20e5f

Avoid buffer allocation overhead for reference decoder benchmark

0af7e7a

Use ARM decoder as benchmark baseline

83eae61

Write magenta error colour instead of black, or throwing

ecc374e

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Erik-White commented Feb 27, 2026 •

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