Re: master 64e25cd: More robust NS hex colour string parsing

["Mattias Engdegård" <mattiase@acm.org>]

8 juni 2020 kl. 14.26 skrev Pip Cet <pipcet@gmail.com>:

> I believe there's very similar code for the X case, where we also
> translate #fff to rgb:f/f/f. That code has annoyed me lately by
> producing nonsensical GCC warnings, maybe you'd like to replace it
> with yours? Having two different versions of this seems superfluous

Thought crossed my mind too. I'm not sure if it makes sense to share the code that transforms #RRGGBB to rgb:RR/GG/BB; it's not a very natural abstraction, and just why are we doing this string transformation step in the first place.

The X11 backend does it so that it can use Xlib for the rest, which is a dubious saving since the string-munging code isn't much simpler than what would be needed to parse the original string to RGB values right away.

The Windows code looks more robust, except that it appears to apply a funny numeric conversion for 4, 12 and 16 bits/colour. It doesn't look quite right at all.

We should probably have a single, correct parser for the numeric colour strings #RGB, rgb:R/G/B, and rgbi:R/G/B instead of three subtly broken ones. X11 and NS additionally have their own formats that I suppose we need to retain for compatibility.