In Towheed Mohammed's Definitive Guide To Theming GRUB 2, written
for the stable release, he wrote concerning the terminal box
background image:
The image is scaled to the screen's dimensions as set by
the GRUB_GFXMODE variable. It is then cropped to fit within the
center slice of the terminal window.
...
The center slice is set to 70% of the screen size and is centered
on the screen. The upper left corner of the image maps to the
upper left corner of the slice.
If that was true for the stable release, it is no longer true for
the beta that shipped with Ubuntu 14.04 LTS.
With the boot menu top = 20%, I would have expected the top of the
menu to be covered (with 5% to spare), but the first menu item was
still visible. And since my boot menu and progress bar both have
left = 14% and width = 72%, I would have expected the term box NOT
to cover the sides of those, but it did. The scaling and cropping
information likewise seems not to apply. For instance, even after
explicitly setting grub_gfxmode='1024x768', the resulting terminal
box is not 70% of that size (e.g. 717x538), but something much less.
As far as I can tell, the image is still centered, but can anyone
supply current information on the size, scaling and cropping of the
image?
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