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List:       kde-bugs-dist
Subject:    [Bug 57928] New: Monospace font display corruption
From:       Stefan Baums <baums () u ! washington ! edu>
Date:       2003-05-01 0:13:15
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http://bugs.kde.org/show_bug.cgi?id=57928     
           Summary: Monospace font display corruption
           Product: kdelibs
           Version: 3.1.1
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: qt
        AssignedTo: null@kde.org
        ReportedBy: baums@u.washington.edu


Version:           3.1.1 (using KDE KDE 3.1.1)
Installed from:    Debian testing/unstable Packages
Compiler:          GCC 
OS:          Linux

Using QT / KDE 3.1.1 Debian GNU/Linux testing, the following severe font problem \
occurs:

When a QT application using a monospace font (tested in Konsole, KEdit, and QTConfig) \
needs to display text using glyphs that are not contained in the primary font \
(defined by user-setting), then QT will

1. Incorrectly request a Sans font instead of a Mono font from fontconfig.

2. Force this font to be displayed as some sort of monospace by adding a large \
whitespace after every single character, in such a way that the space taken up by \
every single character of the secondary font is much larger than that taken up by a \
character of the primary font (which latter should be the guideline, really).  In \
Konsole, this leads to additional display corruption such as overlapping words and \
glyph fragments scattered around the screen.

I observed this setting Bitstream Vera Sans Mono as default font and entering / \
viewing Cyrillic text.  QT requested the non-monospace Nimbus Sans L font from \
fontconfig to display the Cyrillic glyphs.  The same problem occurs when I try to \
view unusual accented Latin characters such as a with macron, though here I have not \
determined the exact font that they are being taken from.

See the following screenshots:

   http://staff.washington.edu/baums/gnome.png
   http://staff.washington.edu/baums/kedit.png
   http://staff.washington.edu/baums/konsole-1.png
   http://staff.washington.edu/baums/konsole-2.png

and the following fontconfig debug output:

   http://staff.washington.edu/baums/debug-5.txt

and the following discussion thread on the fontconfig mailing list, determining that \
the problem does lie with QT:

   http://mail.fontconfig.org/pipermail/fontconfig/2003-April/000363.html

Best regards,
Stefan Baums


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