Bug#612464: Acknowledgement (libpango1.0-0: characters mis-rendered in many fonts)

[Daniel Kahn Gillmor]

> Depending on the selected font (and at different sizes) i regularly
> see garbled renderings.  these usually take the form of several glyphs
> in a font missing some part of their body, often entire horizontal
> stripes missing.
> 
> This happens in different applications, so i think it belongs to the
> underlying font rendering library.  If you think it should be
> reassigned to something other than pango, i would welcome a suggestion
> of where.
> 
> I've attached two screenshots (made with "xwd | convert -
> bad-font-$whatever.png") that capture two different examples of broken text.
> 
> in bad-font-iceweasel.png you can see that the lower-case "t" is
> missing part of its stem.
> 
> in bad-font-gnome-specimen.png you can see several glyphs are chopped
> up.

fwiw, i've now updated my kernel and xorg to newer versions
(2.6.37-1-686 for the kernel, and the versions below for the xorg
packages), and moved ~/.fontconfig out of the way in case there were any
cached data causing problems.

> 0 dkg at pip:~$ dpkg -l | grep xorg
> ii  xorg                                  1:7.6+3                                X.Org X Window System
> ii  xorg-docs-core                        1:1.6-1                                Core documentation for the X.org X Window System
> ii  xorg-sgml-doctools                    1:1.6-1                                Common tools for building X.Org SGML documentation
> ii  xserver-xorg                          1:7.6+3                                the X.Org X server
> ii  xserver-xorg-core                     2:1.9.4-2                              Xorg X server - core server
> ii  xserver-xorg-dev                      2:1.7.7-11                             Xorg X server - development files
> ii  xserver-xorg-input-evdev              1:2.6.0-2                              X.Org X server -- evdev input driver
> ii  xserver-xorg-input-kbd                1:1.5.0-2                              X.Org X server -- keyboard input driver
> ii  xserver-xorg-input-mouse              1:1.6.0-2                              X.Org X server -- mouse input driver
> ii  xserver-xorg-input-synaptics          1.3.0-2                                Synaptics TouchPad driver for X.Org server
> ii  xserver-xorg-video-dummy              1:0.3.4-2                              X.Org X server -- dummy display driver
> ii  xserver-xorg-video-intel              2:2.14.0-3                             X.Org X server -- Intel i8xx, i9xx display driver
> rc  xserver-xorg-video-radeon             1:6.13.1-2+squeeze1                    X.Org X server -- AMD/ATI Radeon display driver
> 0 dkg at pip:~$ 

I don't see the same problems with the same glyphs since this set of
transitions (i know, i didn't hold enough variables constant to make it
a good scientific experiment), but now new glyphs fail to render properly.

Any thoughts on what i can do to get to track down this bug?  I can read
around the mis-rendered glyphs myself, but it makes it awkward to do
things like show a presentation to a group of people.

	--dkg


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