Will
33137706c2
pattern matcher
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3 mesi fa | |
|---|---|---|
| .. | ||
| README.org | 3 mesi fa | |
| example.k | 3 mesi fa | |
| png.k | 3 mesi fa | |
| png.py | 3 mesi fa | |
README.org
PNG tools
First swipe. Lots of clean up to come.
ngn/k is not really built for doing decompression. (At least not with my level of understanding
of compression.) That is to say, decoding bits is very inefficient. Currently this shells out to
zlib_decompress which I have on my iMac and works well enough for now. You can replace this
with anything that decompresses a zlib stream to stdout.
For output, we actually avoid compression by using the "no compression" version of the deflate RFC.
We also compute the crc check though this is also a bitwise computation. Really this should all just be handed off to zlib, but it was fun to try and works well enough if your image size is pretty small.
The example takes the scryer logo and turns it into a black and white image by replacing pixels with bits indicating if the pixel is the background color or not. Then we use this data to generate a no-filtering/no-compression png by hand.
Goals of this project
Nothing major. Mostly I just wanted to get at some image data to play around with some algorithms. This might change.