Generating a QR code with only ARM Assembly (opens in new tab)

Hos do you correct for angles around the axes x, y and z? That’s the hard part I imagine

Thanks, this is going to be a fun read. =)

zxing has an online decoder -- https://zxing.org/w/decode.jspx -- but I've seen it fail so often that I'm wondering whether it's very "strict" / doesn't account for image distortion that much?

Or does the web site use hardcoded settings that are more tweakable in the library?

Huh, interesting -- zxing is in "Maintenance Mode Only": https://github.com/zxing/zxing

I'd be suuuuper interested to know: what's the state of the art in terms of QR decoding, both in terms of decoding speed, amenability to various image distortions, and (which I've always dreamed of) the ability to partially decode a QR code, even if the error correction fails for some parts of it, or even totally? i.e. a very very verbose debugging/decoding mode?

If you just want effective and free and don’t care about open, Google’s is the best https://developers.google.com/ml-kit/vision/barcode-scanning

Also depending on your application you could buy a hardware scanner like https://www.zebra.com/us/en/products/scanners/fixed-mount-sc... for cheap secondhand since they are all over retail. The protocol can be as simple as it “types” the barcode over USB HID like a keyboard, or there are more specialized modes.

The zxing C++ port worked for me recently:

https://github.com/nu-book/zxing-cpp/

Would you mind sharing which one? Did you look at a few / are there good comparison articles?

I don't know about others, but I want to read Digikey barcodes. They are in data-matrix format.

My experience is mostly with x86, where the answer is a definitive "no"; for ARM, my guess is "likely no" --- it's a RISC, so instruction selection isn't as critical, and all instructions are fixed-width so again there isn't as much flexibility in instruction selection (e.g. in x86 a "xor reg, reg" is the canonical way to zero a register, and explicit loading with a constant 0 is very much discouraged and a few bytes bigger, even compilers know about that now.) That said, I've also seen compilers do ridiculous stupid things which no human ever would.

Cant speak much for x86, but for many older / less common architectures (I can speak for z80) the compilers aren’t as advanced or are missing extensive optimizations.

Apparently it is possible to create QR codes on Factorio's minimap as well. I wonder if it could be automated using the in-game construction bots.

[Example](https://www.reddit.com/r/factorio/comments/gqfi33/you_can_ma...)