Hey Saul. Good to see you again. :) Thanks for your report. Much love for DarkDraw here. Thanks for working on a converter.

Yep. The issue is exactly as you described. Many years ago when I wrote the first version of Durdraw I didn't think hard enough about my data structures, and copied the lousy names "x" and "y" from Ncurses standard functions. In retrospect, this was a very bad idea that has led to various confusion, including this bug. Something like "line" and "column" would have been more clear.

There are many places in the source code where these member names are touched. Fixing it has not been the highest priority.

For now, I think the thing to do to is to update the spec file to match reality, with the "rotated" color map. It's kind of lame, but if this is fixed in a future version, then both the .dur file format version number will increment, and the spec file will be updated again.

Yeah that makes sense to just update the spec. Though, you're pre-1.0 now, so if you think you might want to change the format, now (or before 1.0) is the time. It's a hassle but it never gets any easier :)

You're right, and I do want this fixed in the next version (8) of the file format. Even if internally Durdraw is a bit confused about X and Y, it doesn't make sense for the file format to have the rotated color map.

I'll work on updating durformat.md to accurately reflect .dur format version 7 (with the rotated color map), and work on the code+spec for version 8 to fix this issue.

Officially, File format 7 contains the rotated color map, so you might want to reflect that in your converter. (I'm sorry for making you write extra code here when version 8 comes out, but you'll probably want compatibility with whatever people are currently making with Durdraw, I'm thinking.)