Fast SSIMULACRA2 Implementation in Zig

Summary

fssimu2 Fast SSIMULACRA2 derivative implementation in Zig. Usage fssimu2 | [version] usage: fssimu2 [options] < reference > < distorted > options: --json output result as json --err-map < out > save error map to .png/.tga -h, --help show this help -v, --version show version information sRGB PNG, PAM, JPEG, WebP, or AVIF input expected Example output: $ ./ssimu2 ref.png dst.png 79.83781132 Performance Performance tested on the Intel Core i7 13700k using a 3840x2160 test image. The numbers indicate that this implementation is up to 23% faster and uses ~40% less memory compared to the reference implementation. poop "ssimulacra2 medium.png dst.png" "./ssimu2 medium.png dst.png" Benchmark 1 (7 runs): ssimulacra2 medium.png dst.png measurement mean ± σ min … max outliers delta wall_time 809ms ± 46.8ms 760ms … 857ms 0 ( 0%) 0% peak_rss 1.34GB ± 1.51MB 1.34GB … 1.34GB 0 ( 0%) 0% cpu_cycles 3.90G ± 243M 3.65G … 4.15G 0 ( 0%) 0% instructions 9.33G ± 3.00M 9.32G … 9.33G 1 (14%) 0% cache_references 118M ± 1.33M 116M … 119M 0 ( 0%) 0% cache_misses 60.0M ± 3.00M 57.0M … 63.4M 0 ( 0%) 0% branch_misses 16.6M ± 101K 16.5M … 16.8M 0 ( 0%) 0% Benchmark 2 (9 runs): ./ssimu2 medium.png dst.png measurement mean ± σ min … max outliers delta wall_time 618ms ± 10.4ms 603ms … 631ms 0 ( 0%) ⚡- 23.6% ± 4.2% peak_rss 817MB ± 118KB 816MB … 817MB 0 ( 0%) ⚡- 39.1% ± 0.1% cpu_cycles 3.05G ± 45.1M 2.99G … 3.10G 0 ( 0%) ⚡- 21.7% ± 4.5% instructions 6.17G ± 24.8M 6.11G … 6.18G 3 (33%) ⚡- 33.8% ± 0.2% cache_references 74.7M ± 13.7K 74.7M … 74.7M 1 (11%) ⚡- 36.6% ± 0.8% cache_misses 34.9M ± 686K 34.1M … 35.8M 0 ( 0%) ⚡- 41.9% ± 3.7% branch_misses 11.4M ± 138K 11.0M … 11.5M 1 (11%) ⚡- 31.2% ± 0.8% Conformance to the reference SSIMULACRA2 implementation can be tested with validate.py by supplying the ssimu2 binary. validate.py requires uv and libjxl . validate.py --custom ~ /git-cloning/fssimu2/zig-out/bin/ssimu2 ~ /git-cloning/gb82-image-set/png/ * Output on the gb82 image set invoking the above command:...