74 lines
2.5 KiB
Markdown
74 lines
2.5 KiB
Markdown
# QOI - The “Quite OK Image” format for fast, lossless image compression
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Single-file MIT licensed library for C/C++
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See [qoi.h](https://github.com/phoboslab/qoi/blob/master/qoi.h) for
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the documentation.
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More info at https://phoboslab.org/log/2021/11/qoi-fast-lossless-image-compression
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⚠️ 2021.11.30 – the file format is not yet finalized. We're still working to fix
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some smaller issues. The final specification will be announced on 2021.12.20.
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Thanks for your patience! The WIP file format specification can be found in
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[qoi.h](https://github.com/phoboslab/qoi/blob/master/qoi.h)
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## Why?
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Compared to stb_image and stb_image_write QOI offers 20x-50x faster encoding,
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3x-4x faster decoding and 20% better compression. It's also stupidly simple and
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fits in about 300 lines of C.
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## Example Usage
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- [qoiconv.c](https://github.com/phoboslab/qoi/blob/master/qoiconv.c)
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converts between png <> qoi
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- [qoibench.c](https://github.com/phoboslab/qoi/blob/master/qoibench.c)
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a simple wrapper to benchmark stbi, libpng and qoi
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## Limitations
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The QOI file format allows for huge images with up to 18 exa-pixels. A streaming
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en-/decoder can handle these with minimal RAM requirements, assuming there is
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enough storage space.
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This particular implementation of QOI however is limited to images with a
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maximum size of 400 million pixels. It will safely refuse to en-/decode anything
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larger than that. This is not a streaming en-/decoder. It loads the whole image
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file into RAM before doing any work and is not extensively optimized for
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performance (but it's still very fast).
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If this is a limitation for your use case, please look into any of the other
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implementations listed below.
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## Tools
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- https://github.com/floooh/qoiview
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## Implementations of QOI
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- https://github.com/MasterQ32/zig-qoi (Zig)
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- https://github.com/steven-joruk/qoi (Rust)
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- https://github.com/ChevyRay/qoi_rs (Rust)
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- https://github.com/zakarumych/rapid-qoi (Rust)
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- https://github.com/xfmoulet/qoi (Go)
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- https://github.com/panzi/jsqoi (TypeScript)
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- https://github.com/0xd34df00d/hsqoi (Haskell)
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- https://github.com/pfusik/qoi-ci (Ć)
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- https://github.com/kodonnell/qoi (Python)
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- https://github.com/NUlliiON/QoiSharp (C#)
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- https://github.com/rbino/qoix (Elixir)
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- https://github.com/elihwyma/Swift-QOI (Swift)
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- https://github.com/saharNooby/qoi-java (Java)
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- https://github.com/Cr4xy/lua-qoi (Lua)
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## Packages
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[AUR](https://aur.archlinux.org/pkgbase/qoi-git/) - system-wide qoi.h, qoiconv and qoibench install as split packages.
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