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| larkstongue by Matt Current [web] | ||||||||
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popularity : 52% |
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added on the 2020-05-09 07:16:07 by jobe  |
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Nice!
tool thumbs
Looks good, thanks for sharing!
nice!
I've been wondering about this myself - what are the typical gains from using using Hilbert curve mapping as opposed to eg. the zigzag pattern used in JPEG?
Quote:
- Hilbert curve mapping for bitmaps
I've been wondering about this myself - what are the typical gains from using using Hilbert curve mapping as opposed to eg. the zigzag pattern used in JPEG?
oops;
I haven't tried the zigzag pattern. I did try the Z-order curve, and at least with my small sampling of test assets, it was actually worse than just a simple left-to-right mapping.
I should see if that zigzag pattern is better, and I am planning to expand Larkstongue to be modular, in a way, with support for several mappings and compression algorithms, with the packer including the ones that are most efficient for that particular set of assets in the cart.
I should see if that zigzag pattern is better, and I am planning to expand Larkstongue to be modular, in a way, with support for several mappings and compression algorithms, with the packer including the ones that are most efficient for that particular set of assets in the cart.
if you haven't you should really try LZ4 packing ( should fit perfectly with the platform regarding size/speed)
You could even try using an arithmetic, ANS or range coder (like all the fancy packers do), but that might be a bit more tricky to implement. But then you could turn the RLE and Hilbert curve/zigzag/... mapping and LZ4 coding into prediction models, instead of having to bruteforce between all those options.
I'll have to look into that. Although, right now it bruteforces through six options (left-to-right mapping and Hilbert mapping, then RLE, Huffman or both) and for now, that takes an insignificant amount of time :)
I'm going to try LZ4 as well. I tried LZW before, and it didn't really do well against RLE + Huffman in terms of compression ratio per code size. I'm not really looking for speed, as the PICO-8 has 2 megabytes of Lua memory and you can realistically just decompress everything as soon as the cart loads.
I'm going to try LZ4 as well. I tried LZW before, and it didn't really do well against RLE + Huffman in terms of compression ratio per code size. I'm not really looking for speed, as the PICO-8 has 2 megabytes of Lua memory and you can realistically just decompress everything as soon as the cart loads.
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Current features:
Larkstongue is currently in early public alpha, so there will probably be a lot of quirks still. Remember to keep backups of any carts you use it on!
Give it a try! Do try to break it and tell me how you broke it 🙂