Tuesday, December 5, 2023

Announcing CPNG, "Compatible Network Graphics", a backwards compatible fork of PNG

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CPNG (" C om p atible N etwork G raphics") is a 100% backwards compatible fork of the ~30 year old PNG image format , which is st...
Friday, May 12, 2023

The claimed rANS decoding advantages are being exaggerated

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To put it simply: SSE 4.1, on an Intel Ice Lake CPU: SIMD Range: 64 streams: 738 MiB/sec., 436,349 bytes SIMD Range: 16 streams: 619.1 MiB/s...
Friday, May 5, 2023

LZ_XOR/LZ_ADD progress

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I'm tired of all the endless LZ clones, so I'm trying something different. I now have two prototype LZ_XOR/ADD lossless codecs. In t...
Sunday, April 30, 2023

Somewhere Range Coding went off the rails

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I've lost track of the number of Range Coders I've seen floating around for the past ~25 years. Subbotin's coders released in t...

Comparing Vectorized Huffman and Range Decoding vs. rANS (Or: rANS entropy coding is overrated)

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The point here is to show that both Huffman and range decoding are all vectorizable and competitive vs. rANS in software. What I care about ...
Monday, April 24, 2023

Vectorized interleaved Range Coding using SSE 4.1

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In order to avoid the current (and upcoming) ANS/rANS entropy coding patent minefield, we're avoiding it and using vectorized Range Cod...
Friday, April 21, 2023

Faster LZ is not the answer to 150-250+ GB video game downloads

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When the JPEG folks were working on image compression, they didn't create a better or faster LZ. Instead they developed new approaches. ...