Support for JPEG XL (JXL) images#3153
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Implementation of ac_strategy.h and ac_strategy.c
For now JxlMemoryManager will be a wrapper around MemoryPool<T>.
Implementation of image.h and image.c; AC strategy implementation was slightly adjusted to reduce errors.
This is an implementation of field_encodings.h. Note that I avoided implementing EnumValid() and Values() functions, as we have dedicated methods in .NET to do exactly that (Enum.IsDefined, Enum.GetValues)
Implementation of spline.h
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Prerequisites
Description
This is a work-in-progress PR whose goal is to introduce decoding and encoding of JPEG XL (*.jxl) images.
Reference software
I use libjxl as reference. See https://github.com/libjxl/libjxl.
Performance
I will begin by applying light optimizations as I implement parts of the JPEG XL codec. Once the codec seems complete enough to handle decoding and encoding of JPEG XL images, I will apply heavier optimizations. Examples include but are not limited to stack allocation, array pooling, and SIMD.
Other components
The JPEG XL codec, additionally, uses the LZ77 and Brotli compression codec. I will also have to implement those eventually.
Implementations
The JPEG XL codec lives under
src/ImageSharp/Formats/Jxl.Brotli and LZ77 implementations will live under
src/ImageSharp/Compression.Testing
I will start adding tests whenever the codec is complete enough to handle decoding of JPEG XL images.
Additionally, JPEG XL reference software, libjxl, contains its own tests too, which I might also implement without modification.