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veluca93 / fpnge

Demo of a fast PNG encoder.
Apache License 2.0
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[fjxld] group tiles by type, then decode using SIMD #26

Closed alantudyk closed 11 months ago

alantudyk commented 11 months ago

Hi, Luca.

The question is related to jxl.

Previously I noticed that decoder is 10 times slower than encoder: https://github.com/libjxl/libjxl/pull/1975#issuecomment-1416775973

I guess, it is because of dependency between pixels at decoding. What if to group tiles with the same predictor type?

I said "guess" because I'm unable to locate the code for encoding and decoding -e 1, the structure of libjxl is a bit over-complicated. Can you provide the direct links at current master?

Or, maybe, you want to test this idea and write fjxld?

veluca93 commented 11 months ago

Moving the discussion to the jxl repo, which is more appropriate :)