Hardcode Makie's default fonts to avoid findfont latency

[jkrumbiegel]

It seems that font search can account for long loading latency if a user has a lot of font files JuliaLang/julia#47184 (comment)

There were ideas to solve this on the FreeTypeAbstraction level by caching the list of fonts found on the system, for example in this issue: JuliaGraphics/FreeTypeAbstraction.jl#67

I think it might make sense to just add the names of Makie's default fonts as they are specified in the theme to Makie.to_font, so that findfont is not even run for those names. Sort of like:

if fontname == "TeX Gyre Heros Makie Regular"
   # access font file shipped with Makie
elseif fontname == "TeX Gyre Heros Makie Italic"
    ....
else
    findfont(...

I think this would be the easiest to do because it doesn't need a caching mechanism to alleviate the latency issue (we can still add better caching to FreeTypeAbstraction later if desired).

[timholy]

This seems like the right solution.

We're starting to write up TTFX blog posts etc. that will include many benchmarks, and it would be nice to be able to include Makie. Fixing this issue appears to be Makie's ticket-to-entry (I will exclude it from discussion otherwise), as on my system Makie's font selection accounts for almost all of the TTFP (compilation is just ~1%).

Plots has a similar (though much less serious) issue, xref jheinen/GR.jl#505.

[jkrumbiegel]

@timholy do you want to check if the problem is gone with #2531?

[timholy]

Previously I had a latency for @time @eval display(plot(sin.(rand(100)))) of ~19s. Now it's 2s! Thanks so much!

[sefffal]

On my computer and Julia master, this brought down the using time of GLMakie from about 40s to 17.5s

[jkrumbiegel]

It's crazy that this was going on for so long, goes to show again that the systems that the devs run matter a lot.