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The information that may help you is stated as a reference at the edk2 Fonts.c at master thread.
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Thank you for the answer.
Unfortunately, it's slightly not an answer I need. edk2 Fonts.c at master contains functions that extract bitmaps from "installed" font's glyphs and copy them to the display buffer to output.
However, I need to create new glyphs which doesn't exist even as bitmaps yet.
Ok, I'll try to ask edk2-devel.
With best regards,