SDL GUI backend

[mmuman]

The idea is to be able to run Conky on ancient OSes and hardware (thinking about MiNT (not the GNU/Linux distro, the Atari OS) or AmigaOS), in a regular window but with minimal coding required, and also to allow testing the GUI backend without X11. I used SDL 1.2 because SDL2 only runs on Windows, OSX and Linux, which limits the interest for old platforms.

For now it only draws text with a hardcoded font. It also still needs to be compiled with X11 due to some variables here and there.

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[mmuman]

I added some way to locate and load TTF files by the font name, it kinda works.

[mmuman]

Just rebased, had to change some #ifdef info #if defined(BUILD_WAYLAND) || defined(BUILD_SDL) so maybe we'd need some BUILD_NONX11 define around to avoid these lists everywhere?

[brndnmtthws]

Just rebased, had to change some #ifdef info #if defined(BUILD_WAYLAND) || defined(BUILD_SDL) so maybe we'd need some BUILD_NONX11 define around to avoid these lists everywhere?

That could work, though it seems messy. There's also BUILD_GUI, but it sounds like that won't help here.

[mmuman]

The recent changes on color stuff just got rid of the #ifdef thing.

[mmuman]

And we have colors :-)

[Caellian]

Hi, I changed how registration of output displays works to avoid linker magic, you can check out how other backends are registered on main branch for reference.

Main differences are:

• sdl-output.cc should be guarded by build flag in CMakeLists.txt
• You need to provide a log message template fallback in display-output.cc for feature gated outputs