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Subject: [Bug 199438] vt(4) cannot load GNU Unifont
Date: Tue, 14 Apr 2015 03:15:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199438

            Bug ID: 199438
           Summary: vt(4) cannot load GNU Unifont
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: lantw44@gmail.com

Created attachment 155584
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155584&action=edit
Increase VTFONT_MAXMAPPINGS and VTFONT_MAXGLYPHSIZE

I downloaded GNU Unifont from this website:
http://www.unifoundry.com/unifont.html

I tried to convert the BDF file to FNT file with vtfontcvt, but I got E2BIG
error when trying to load the converted file with vidcontrol -f.

It seems it was caused by the limits set in sys/dev/vt/vt_font.c.
#define    VTFONT_MAXMAPPINGS  8192         
#define    VTFONT_MAXGLYPHSIZE 1048576      

The values showed when loading the font.
f->map_count[0] = 12894
f->map_count[1] = 23362
f->map_count[2] = 0
f->map_count[3] = 0
glyphsize = 1133296

If I increase the limit with the attached patch, the font can be successfully
loaded.

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