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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