WGLMakie relocatability

[jkrumbiegel]

This PR adds only the necessary changes from #3882 to the recent GLMakie relocatability PR #4461. I confirmed locally that this allows to compile a relocatable WGLMakie app using the script that @SimonDanisch introduced in #4461

After both #4461 and this are merged, we can update #4288 so that CI tests CairoMakie and WGLMakie for relocatability as well. Last status there was that I had gotten it to work for CairoMakie but WGLMakie got stuck in CI, probably due to an incorrect setup with xvfb or Electron or so. As I tested locally that it can work, this should not be a fundamental issue.

[bjarthur]

do your tests cover font handling? i had trouble relocating without the explicit conversion to String when dealing with FreeTypeAbstractions. please consider as necessary the changes i proposed in src/conversions.jl.

[jkrumbiegel]

do your tests cover font handling? i had trouble relocating without the explicit conversion to String

As mentioned in that other PRs comments, I think that was a side effect of the incorrect use of @path

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt. All benchmark results are based on the mean time and negative percent mean faster than the base branch. Note, that GLMakie + WGLMakie run on an emulated GPU, so the runtime benchmark is much slower. Results are from running:

using_time = @ctime using Backend
# Compile time
create_time = @ctime fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @ctime Makie.colorbuffer(display(fig))
# Runtime
create_time = @benchmark fig = scatter(1:4; color=1:4, colormap=:turbo, markersize=20, visible=true)
display_time = @benchmark Makie.colorbuffer(fig)

	using	create	display	create	display
GLMakie	5.17s (5.13, 5.20) 0.03+-	114.94ms (111.22, 122.16) 4.72+-	423.01ms (417.75, 430.33) 5.28+-	9.62ms (9.43, 9.73) 0.09+-	26.27ms (26.18, 26.34) 0.05+-
master	5.15s (5.11, 5.20) 0.03+-	112.31ms (110.50, 114.02) 1.21+-	421.22ms (416.68, 431.72) 5.45+-	9.54ms (9.36, 9.65) 0.09+-	26.21ms (25.98, 26.34) 0.12+-
evaluation	1.00x invariant, 0.01s (0.38d, 0.49p, 0.03std)	0.98x invariant, 2.63ms (0.76d, 0.20p, 2.96std)	1.00x invariant, 1.79ms (0.33d, 0.54p, 5.36std)	0.99x invariant, 0.09ms (0.93d, 0.11p, 0.09std)	1.00x invariant, 0.06ms (0.64d, 0.26p, 0.09std)
CairoMakie	4.89s (4.82, 4.98) 0.05+-	110.28ms (108.57, 112.91) 1.41+-	167.20ms (166.12, 169.55) 1.23+-	9.43ms (9.19, 9.67) 0.20+-	1.18ms (1.14, 1.23) 0.04+-
master	4.87s (4.82, 4.96) 0.05+-	110.65ms (108.66, 114.78) 2.19+-	167.91ms (165.69, 172.05) 2.68+-	9.30ms (9.17, 9.46) 0.13+-	1.18ms (1.14, 1.25) 0.04+-
evaluation	1.00x invariant, 0.02s (0.34d, 0.54p, 0.05std)	1.00x invariant, -0.38ms (-0.20d, 0.71p, 1.80std)	1.00x invariant, -0.71ms (-0.34d, 0.54p, 1.95std)	0.99x invariant, 0.13ms (0.78d, 0.18p, 0.16std)	1.00x invariant, 0.0ms (0.11d, 0.84p, 0.04std)
WGLMakie	5.76s (5.67, 5.83) 0.07+-	114.06ms (109.31, 119.96) 3.98+-	4.88s (4.75, 5.07) 0.11+-	12.69ms (12.23, 13.00) 0.26+-	118.77ms (111.59, 125.74) 4.60+-
master	5.68s (5.42, 5.87) 0.16+-	115.85ms (107.90, 137.16) 10.50+-	5.13s (4.89, 5.52) 0.22+-	12.19ms (11.53, 13.87) 0.87+-	119.05ms (116.17, 121.88) 1.80+-
evaluation	0.99x invariant, 0.08s (0.65d, 0.26p, 0.11std)	1.02x invariant, -1.79ms (-0.23d, 0.68p, 7.24std)	1.05x faster✅, -0.25s (-1.44d, 0.03p, 0.16std)	0.96x invariant, 0.5ms (0.78d, 0.19p, 0.57std)	1.00x invariant, -0.28ms (-0.08d, 0.89p, 3.20std)