Master issue for other platforms and backends

[andlabs]

Putting all of this in one place. Note that this does not include build configurations that aren't explicitly listed or made out of the box yet are still possible (such as the various BSDs, desktop on ARM, etc.); I'll probably make a separate issue for that.

Qt
Status: unplanned

Android, iOS, other mobile devices (maybe even Palm OS if I'm masochistic enough)
Status: unplanned
I'm pretty sure the paradigms of mobile devices differ enough from those of desktop devices that this would be better served by a separate library, but I'm not 100% sure.

ncurses, other terminal APIs
Status: unplanned
ncurses does not have GUI components, IIRC... This page looks promising, though. There are also people who aren't as privy to ncurses as they are to other libraries like Termbox.

Haiku
Status: BACK (see remodel branch)

HTML+CSS (possibly with enscriptem, or as an HTTP server, or something)
Status: unplanned
I have no idea where to start with this. The concept of a window would also be a pain point. Existing notes:

• GTK+ does have broadwayd, but last time I checked it's little more than a proof-of-concept not suitable for web use (in fact, back when I actually tried using it, if two people tried to connect to the same web server, the person who got in first would be kicked out using bizarre errors)
• @adamierymenko in Bindings to 'wt' for web use? #339 suggested https://github.com/emweb/wt, which might be a bit heavyweight, but still a possibility

Plan 9
Status: wanted
My nostalgia makes me want this. libcontrol is a bit incomplete; integrating libthread (required by libcontrol last time I checked) might be problematic; I forget if libdraw supports alpha transparency or floating-point coordinates; window events become moot. What even is the currently supported Plan 9 version or distribution??

OS/2, eComStation, ArcaOS
Status: wanted
I kinda want this both for novelty and because it seems to be making a comeback among big open source projects. I own sealed copies of OS/2 Warp 3, but I don't know what development tools I would need to get to be able to work with this, or what APIs it provides that prevent libui from working as desired here. If it turns out I would need a newer OS/2, I would need to get those as well...

Out-of-tree backends
Status: unplanned
I have no idea where to start with this, if it even is possible...

[andlabs]

It seems that the only way to do modern vector graphics with any version of OS/2 — including ArcaOS — is with cairo. Is that correct?

[mischnic]

HTML+CSS (possibly with enscriptem, or as an HTTP server, or something)

Qt apps can be compiled to emscripten, the performance ... depends on the app:
http://vps2.etotheipiplusone.com:30176/redmine/projects/emscripten-qt/wiki

Demos: http://vps2.etotheipiplusone.com:30176/redmine/projects/emscripten-qt/wiki/Demos

[andlabs]

https://visopsys.org/developers/

[andlabs]

Oh I forgot about AmigaOS too

I couldn't get the 4.1 ISO to boot in WinUAE with the PPC support enabled, and supported computers are stupid expensive, so...

No clue about AROS.

[andlabs]

Also forgot about RISC OS, if I could even figure out how to write C code for it

[andlabs]

OpenVMS? It appears I'd be stuck with Motif in that case?

QNX with Photon?

[andlabs]

Also for the record, the reason I ask about cairo on OS/2 (and allegedly AmigaOS 4.x too? I am incredulous) is because cairo's license conflicts with libui's, so I can't bundle it except in the DLL form (which defeats the purpose of having the static library option). On Unix it's not a problem because cairo is already a dependency of GTK+, which has to be provided by the distro anyway (and if the part about AmigaOS is true then that might also be the case there), but OS/2 doesn't come with cairo (and I'm not sure about eComStation or Arca Noae).

[andlabs]

NetSurf apparently supports all of these and Atari TOS and maybe a few others to boot; will need to check its code

[andlabs]

PC/GEOS aka Breadbox Ensemble? I can't find any documentation so I don't know about the graphical capabilities it gained over time, but I do see the ExtUI has some stuff we can use...

[andlabs]

Okay so it is possible to write graphical programs in C++ for Fuchsia: https://fuchsia.googlesource.com/topaz/+/refs/heads/master/examples/ui/paint/paint_view.cc (I think this specific repo is outdated though)

[andlabs]

QNX 4.25 Photon's API doesn't seem to have alpha blending, so that's a dead end for libui's graphics requirements. Not sure about newer versions, since 4.25 is rather old. (If all else fails, QNX can just use the GTK+ version via X11 instead of Photon, assuming GTK+ has been ported to QNX.)

[andlabs]

QNX 6.0 Photon has alpha blending; it appears this was the first version to do so, but I would need to find QNX 5.0 Photon release notes to find out. It doesn't seem to have floating-point geometry, though... unless I missed something.