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Subject: convbdf bug - one pixel too high
From: Uwe Freese (
Date: 2002-09-22


It seems that convbdf doesn't use the "displacement" values

In the standard font, all (normal) characters start at the second line (from
the bottom), the y displacement is -1 ("FONTBOUNDINGBOX 6 8 0 -1, "BBX
6 8 0 -1"). On the AJB, the font is ok and the bottom line (of all
normal characters like ABC...) is empty as it should be.

My font (uwe_prop.bdf on the www-fonts-dir) has characters that start
from the first line, the y displacement is 0 ("FONTBOUNDINGBOX ? 8 0 0, "BBX
? 8 0 0"). But the characters are converted one pixel too high. That
is visible in the .c file and on the AJB itself.

And really funny is that the "[" (the upper line of this character
should be empty, so it's no "overflow") is actually

   | **|
   | * |
   | * |
   | * |
   | * |
   | * |
   | **|
   | * |

Where does this single pixel at the bottom line come from?

I tested also timR08.bdf (fonts dir on www) and that font is also
converted one pixel too high into the .c file.

Bye, Uwe.

Page was last modified "Jan 10 2012" The Rockbox Crew