[Bug 461617] modified Sazanami-Gothic font showing vertical text rendering glitches not seen in the original

bugzilla at redhat.com bugzilla at redhat.com
Tue Sep 29 15:45:43 UTC 2009


Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.


https://bugzilla.redhat.com/show_bug.cgi?id=461617





--- Comment #13 from Caolan McNamara <caolanm at redhat.com>  2009-09-29 11:45:41 EDT ---
So, on the ttx front I have some findings anyway...
upstream .ttf
$ ttx -l sazanami-gothic.ttf |grep GDEF
    tag     checksum   length   offset
    GDEF  0x00293516       30  3654796
$ od -Ax -j 3654796 -t x1 sazanami-gothic.ttf -N 30
37c48c 00 01 00 00 00 0c 00 00 00 16 00 00 00 02 00 01
37c49c 00 03 35 0f 00 01 00 04 00 00 00 02 00 00
37c4aa

unpacked and repacked with ttx as above and we get...
$ ttx -l sazanami-gothic.ttf |grep GDEF
    tag     checksum   length   offset
    GDEF  0x00293515       30  7701068
[root at Nom tmp]# od -Ax -j 3804688 -t x1 sazanami-gothic.ttf -N 30
75824c 00 01 00 00 00 0c 00 00 00 16 00 00 00 02 00 01
75825c 00 03 35 0f 00 01 00 04 00 00 00 01 00 00
75826a
which also gives the weirdness

If I now tweak the "CoverageFormat" bit (where the two above differ) for the
GDEF from Format 1 to Format 2 within ttx then it works fine. e.g.

original .ttf unpacked and repacked with my custom ttx
ttx -l sazanami-gothic.ttf |grep GDEF
    GDEF  0x00293516       30  7701068
od -Ax -j 7701068 -t x1 sazanami-gothic.ttf -N 30
75824c 00 01 00 00 00 0c 00 00 00 16 00 00 00 02 00 01
75825c 00 03 35 0f 00 01 00 04 00 00 00 02 00 00
75826a

So there is likely at least one route to solving this by e.g. extending ttx to
support an additional flag like the existing -b which says not to recalculate
bounding boxes with another one that says not to recalculate which
CoverageFormat is more efficient and turn the changes of bug 196433 into a
patch to the .ttx output of ttx. I'll have a poke at this to see if that would
work in theory at least.

-- 
Configure bugmail: https://bugzilla.redhat.com/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.




More information about the fonts-bugs mailing list