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loader: use display pixel density for font autoselection
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Authored by tsoome on Feb 22 2021, 9:14 AM.

Details

Summary

Calculate font size from 16 density independent pixels (dp) by using:
size = 16 * ppi/160 * display_factor

We are specifying font size 16dp, and assuming 1dp = 160ppi.
Also apply scaling factor 2 (display_factor).

Test Plan

test with different systems and resolutions

Diff Detail

Repository
rG FreeBSD src repository
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

use gop_handle, not gop protocol

make it actually to work...

Works for me, now the font seems fine on a 2160p monitor, and there's no black bar at the bottom of the screen.

Don't really have much knowledge in this area to provide a meaningful review I'm afraid.

stand/efi/loader/framebuffer.c
505

size = MAX(sizeof(*edid_infop), edid->SizeOfEdid);

This revision was not accepted when it landed; it landed in state Needs Review.Feb 27 2021, 9:28 AM
This revision was automatically updated to reflect the committed changes.