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If QOI is interesting because of speed, you might take a look at fpng, a recent/actively developed png reader/writer that is achieving comparable speed/compression to QOI, while staying png compliant.
https://github.com/richgel999/fpng
Disclaimer: have not actively tried either.
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Exactly. Normally you use second-level tables for the long codes. In the first table, if code doesn't reach a leaf, tbl[code] holds a pointer to the next table to use.
For example, here's JPEG XL's Huffman decoder: https://github.com/libjxl/libjxl/blob/1c67f4eff0464e6241f365.... The branch uses a second table if the code was too long.
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> But its not like any reader ever supports it fully, hell most readers dont support showing the other images in a png file.
Do you mean APNG? In all fairness, that is not even in the specification although there is discussion to add it. https://github.com/w3c/PNG-spec/issues/26
The one that was specified was MNG but it was a different format and practically no one used it since it was not parsable as a PNG.
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