Re: Kerning-problem with pango

[Simos Xenitellis <simos74 gmx net>]

Hi Hadmut,
This problem is described in detail in
http://bugzilla.gnome.org/show_bug.cgi?id=334758
and relates to the DejaVu fonts. 

There is an updated (emergency) version of the DejaVu, 2.4.1, at
http://dejavu.sourceforge.net/
The scheduled version, 2.5, will appear in mid-April.

If you manage to find this behaviour of DejaVu in other fonts, please
report it.

The "Sans" font in Linux is some sort of virtual font; the system
(fontconfig) picks glyphs from installed fonts following the rules
in /etc/fonts/fonts.conf. In Ubuntu Dapper, it picks most of the glyphs
from DejaVu Sans.

Simos

On Wed, 2006-03-29 at 21:32 +0200, Hadmut Danisch wrote:
> Hi,
> 
> I have a problem with font kerning in pango: It does not do the
> kerning for some fonts. It still seems to be the same problem as
> reported for gimp in bug 316586, but did some more tests to track this
> down. Maybe someone more experienced with pango internals could help
> debugging. 
> 
> As a test case I rendered the word 'Test' (the bounding boxes of 'T'
> and 'e' should overlap):
> 
> 
> 
> - The problem occurs with inkscape, rsvg, gimp, libpango1-ruby, 
>   but not with scribus or the freetype test tool ftstring. The latter
>   two do use freetype, but not pango. 
> 
> 
> - The problem occurs with some fonts only. E.g. the testscript at the 
>   end of this mail renders the "Sans" font (which is actually
>   DejaVu-Sans.ttf on my Debian system) with kerning, but the "Arial"
>   font without kerning, although that font definitely has
>   kerning. (It is the Microsoft arial.ttf fron WinXP, ttf is 151232
>   bytes long.)
> 
> 
> - The problem is not specific to my machine. Several readers of the
>   inkscape mailing list confirmed the problem, while other's didn't. 
> 
>   Today I tried to reproduce the problem on a Ubuntu machine, but
>   there the kerning worked. Same font file.
> 
> 
> 
> Any idea?
> 
> 
> regards
> Hadmut
> 
> The ruby test program:
> 
> require 'gtk2'
> 
> Gtk.init
> 
> str = <<ENDE
> <span size="300000" face="Sans">Test</span>
> <span size="300000" face="Arial">Test</span>
> ENDE
> attrs, text, accel_char = Pango.parse_markup(str, '$')
> 
> label = Gtk::Label.new(text)
> label.attributes = attrs
> 
> Gtk::Window.new.add(label).show_all
> 
> Gtk.main
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