SharpAstro.Png 3.6.561

SharpAstro Codecs

A family of pure-managed, AOT-compatible image-codec packages for .NET 10 — no native binaries. Each format ships as an independent NuGet, and SharpAstro.Codecs is a thin facade that sniffs a byte stream by its magic bytes and dispatches to the right decoder, so a consumer can reference one package instead of cherry-picking codecs.

Formats: PNG (read/write), JPEG (baseline + progressive decode, incl. scaled 1/2–1/8 LOD), TIFF (read/write), JPEG XR (read/write, jxrlib-exact), OpenEXR (read/write), JPEG XL (read/write), plus EXIF reading and a bundled sRGB ICC profile. See CODECS.md for the full per-package decode/encode matrix and how to pick the right one.

All packages target net10.0, are IsAotCompatible, ship SourceLink debugging, and publish in lockstep (shared Major.Minor + CI run-number patch).

NuGet

# One facade for sniff-and-decode (PNG, JPEG incl. Ultra HDR, TIFF, JXR, EXR, JXL):
dotnet add package SharpAstro.Codecs

# ...or reference just the format(s) you need:
dotnet add package SharpAstro.Png
dotnet add package SharpAstro.Jxr

Usage

Decode any supported still image through the facade — sniff the header, size a buffer, decode into it:

using SharpAstro.Codecs;

var bytes = File.ReadAllBytes(path);
if (ImageCodecs.TryReadInfo(bytes, out var info))
{
    var rgba = new byte[info.Width * info.Height * 4];
    ImageCodecs.TryDecodeIntoRgba8(bytes, rgba);      // zero-copy into your buffer
    // ...or ImageCodecs.TryDecode(bytes, out IDecodedImage img) for the full-fidelity raster.
}

Each codec is also usable directly — e.g. PngReader / PngWriter, JpegDecoder.Decode / DecodeTo, TiffReader / TiffWriter, JxrImageCodec, ExrImageCodec, JxlImageCodec. See CODECS.md.

Building from source

git clone https://github.com/SharpAstro/Codecs
cd Codecs
dotnet build Codecs.JustTests.sln -c Release
dotnet test  Codecs.JustTests.sln -c Release

Requires the .NET 10 SDK.

License

Unlicense (public domain).

Credits

This repository began as a fork of StbSharp/StbImageSharp (Roman Shapiro's C# port of Sean Barrett's stb_image.h, via the Hebron C-to-C# transpiler). SharpAstro.Jpeg's decoder was ported from and validated byte-exact against that reference decoder before the stb port itself was retired from the repo.