Zune-JPEG
A jpeg decoder with wings.
Features
- A Pretty fast 8*8 integer IDCT.
- Fast Huffman Decoding
- Fast color convert functions.
- Support for extended colorspaces like GrayScale, RGBA
- Multi-threaded decoding.
Features
| feature | on | Capabilities |
|---|---|---|
x86 |
✅ | Enables x86 specific instructions, specifically avx and sse for accelerated decoding. |
Debug vs release
The decoder heavily relies on platform specific intrinsics, namely AVX2 and SSE to gain speed-ups in decoding,
but in debug build rust generally doesn't like platform specific intrinsics (try passing -O parameter to see optimized build) hence obviously speeds tank so bad during debug builds, and there is probably nothing
we can do about that.
The Decoder.
x86_64 benchmarks
Apple M1 benchmarks
The decoder is blazingly fast, especially on x86_64 with AVX2 enabled CPU's(most cpu's from 2013).
Even with CPU's that don't support these extensions, the code is carefully written to allow the auto-vectorizer to accelerate for whatever platforms in mind.
Furthermore, we take advantage of multi-core CPU's to accelerate post-processing of images to bring 1.5x performance edge over libjpeg-turbo and 2x over image-rs/jpeg-decoder.
For more up-to-date benchmarks, see Benches.md.
Note, we do not try to recover corrupt JPEG's, your best bet is libjpeg-turbo for that, all errors are propagated up to the caller.
TODO
- Add support for Adobe APP14 images.