23.0.60; Heavy display problems with new font backend

[Tassilo Horn]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I use

  Emacs.Font: DejaVu Sans Mono-10

set in my .Xdefaults and get quite a lot display problems.  I update my
copy of emacs nearly daily (with make maintainerclean and all), and my
subjective feeling is that in the last 3 or 4 days I have much more
problems.

The most frequent problem is that individual chars look wrong, for
example:

  - quite often a "w", "k", "S" or "r" looks bold although it shouldn't
  - "m" has a green shine between its legs
  - fonts aren't sharp as if subpixel hinting was disabled

The attached pics fonts{1,2,3,4}.png show some of those minor display
problems.

While trying to find some more of those display problems I opened the
attached UTF-8 testfile and found a major display bug.  The pics
v-with-dot.png and v-with-dot2.png show it.

In v-with-dot.png the text is more or less displayed correctly.  The
dots over the v and r are displayed a bit higher using kwrite with the
same font, which looks a bit more natural.  Point is left of the text on
the same line.  Now I move point to the right and as soon as it passes
the v, a and b they're duplicated to the left, resulting in the
situation in v-with-dot2.png.

Additionally in that file most greek chars aren't antialiased.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.0.60/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.2 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-04-19 on baldur
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--prefix=/usr' '--host=i686-pc-linux-gnu' 
'--mandir=/usr/share/man' '--infodir=/usr/share/info' '--datadir=/usr/share' 
'--sysconfdir=/etc' '--localstatedir=/var/lib' '--program-suffix=-emacs-23' 
'--infodir=/usr/share/info/emacs-23' '--without-carbon' '--with-sound' 
'--with-x' '--with-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' 
'--with-rsvg' '--with-tiff' '--with-xpm' '--enable-font-backend' 
'--with-freetype' '--with-xft' '--with-libotf' '--with-m17n-flt' 
'--with-x-toolkit=gtk' '--without-hesiod' '--with-kerberos' '--with-kerberos5' 
'--with-gpm' '--with-dbus' '--build=i686-pc-linux-gnu' 
'build_alias=i686-pc-linux-gnu' 'host_alias=i686-pc-linux-gnu' 
'CFLAGS=-march=i386 -O0 -g' 'LDFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  yas/minor-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  icomplete-mode: t
  window-number-meta-mode: t
  window-number-mode: t
  savehist-mode: t
  exec-abbrev-cmd-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
SPC SPC SPC SPC SPC <return> <return> <return> <return> 
<return> <return> <return> <return> <return> <return> 
<return> <return> <return> <return> <return> SPC SPC 
c <return> c <return> SPC c <return> B <backspace> 
y q <return> B <backspace> y q l s C-x C-f U T <return> 
<down-mouse-5> <mouse-5> <double-down-mouse-5> <double-mouse-5> 
<triple-down-mouse-5> <triple-mouse-5> <triple-down-mouse-5> 
<triple-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<down-mouse-5> <mouse-5> <double-down-mouse-5> <double-mouse-5> 
<triple-down-mouse-5> <triple-mouse-5> <triple-down-mouse-5> 
<triple-mouse-5> <down-mouse-5> <mouse-5> <double-down-mouse-5> 
<double-mouse-5> <triple-down-mouse-5> <triple-mouse-5> 
<triple-down-mouse-5> <triple-mouse-5> <down-mouse-4> 
<mouse-4> <double-down-mouse-4> <double-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <down-mouse-4> <mouse-4> <double-down-mouse-4> 
<double-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<down-mouse-4> <mouse-4> <double-down-mouse-4> <double-mouse-4> 
<triple-down-mouse-4> <triple-mouse-4> <triple-down-mouse-4> 
<triple-mouse-4> <triple-down-mouse-4> <triple-mouse-4> 
<down-mouse-1> <mouse-1> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <right> <up> <up> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
C-x k C-g C-x b <return> M-x r e b <return> <retur
n>

Recent messages:
(No changes need to be saved)
20080419T120438.479> Saving /home/heimdall/.newsrc.eld...
Wrote /home/heimdall/.newsrc.eld
20080419T120438.632> Saving /home/heimdall/.newsrc.eld...done
Contacting host: 87.117.229.205:80
EMMS: "Ordo Equitum Solis - Playing with the Fire" submitted to last.fm
Loading /usr/share/emacs/23.0.60/lisp/international/uni-name.el (source)...done
byte-code: Beginning of buffer [6 times]
Contacting host: post.audioscrobbler.com:80
EMMS: Now playing infos submitted to last.fm
Quit

fonts1.png
Description: PNG image

fonts2.png
Description: PNG image

fonts3.png
Description: PNG image

fonts4.png
Description: PNG image

UTF-8-demo.txt
Description: Text document

v-with-dot.png
Description: PNG image

v-with-dot2.png
Description: PNG image