Message-ID: <XFMail.000522165259.plummer@iarc.fr>
Date: 2000-05-22T14:52:59Z
From: Martyn Plummer
Subject: bug 548 graphics '*' (PR#549)
In-Reply-To: <200005220948.LAA19498@pubhealth.ku.dk>
On 22-May-00 ripley@stats.ox.ac.uk wrote:
> A little more followup. The gtk() device uses gdk_string_width to
> find the character extents. That seems undocumented anywhere in the
> gtk+ sources. It is returning the maximal descent for the font for all
> input strings on my system. Looking at the current gtk+-1.2.7 sources it
> appears to call XTextExtents, and that _should_ give the
> string descent.
>
> Since gdk fonts are private opaque structures I see no way around this.
> Without any documentation I do not even know if it is a gdk bug (although
> I suspect it is or was). The gdk docs in gtk+ seem seriously incomplete.
The best thing that can be said about the GNOME API documentation is
that it is getting better. Documentation on glib, gdk and gtk+ is
available from here:
http://developer.gnome.org/doc/API/
but is still quite sparse.
This is not, in fact, a gdk bug, but is due to a permutation in
the arguments of gdk_string_extents in GTK_MetricInfo
(file src/gnome/devGTK.c). It currently reads
gdk_string_extents(gtkd->font, tmp,
&lbearing, &rbearing,
&iascent, &idescent, &iwidth);
but should be
gdk_string_extents(gtkd->font, tmp,
&lbearing, &rbearing,
&iwidth, &iascent, &idescent);
See
http://developer.gnome.org/doc/API/gdk/gdk-fonts.html#GDK-STRING-EXTENTS
Martyn
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