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background-content: Mipmap background texture rendering

Daniel van Vugt requested to merge vanvugt/mutter:mipmap-workspace-thumbnail-backgrounds into master

gnome-shell displays workspace previews at one tenth scale. That's a few binary orders of magnitude so even using a LINEAR filter was resulting in visible jaggies. Now we apply mipmapping so they appear smooth.

As an added bonus, the mipmaps used occupy roughly 1% the memory of the original image (0.1 x 0.1 = 0.01) so they actually fit into GPU/CPU caches now and rendering performance is improved. There's no need to traverse the original texture which at 4K resolution occupies 33MB, only a 331KB mipmap.

In my case this reduces the render time for the overview by ~10%.

Closes: gnome-shell#1416 (closed)

Edited by Robert Mader

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