Re: Parsing of fontconfig font names and other font related stuff.

[Jan Djärv]

Jan Djärv skrev:
> Kenichi Handa skrev:
> > And, I don't know what dpi is for.  That information should
> > be available via X server.  Is it a way to pretend that you
> > are using a screen of the different DPI?
>
> Yes.  Gnome has 96 dpi as default (settable in a user desktop settings 
> dialog), fontconfig seems to have 75. My monitor is actually 84 dpi.  
> Other applications in Gnome, like gnome-terminal, uses the 96 dpi value, 
> but Emacs uses the default.  That makes Emacs and gnome-terminal look 
> different even though they both use monospace-8.

Actually it is too late to add DPI in xftfont.c, because it must be added long 
before that.  Font.c does DPI calculations all over the place, and assumes 
that either dpi=... is given in the font spec, or that the DPI for the monitor 
can be used.  In fact, it is either 75 (fontconfig default) or 96 (GNOME 
default) that is used, so font.c is wrong (wrong == different from other 
applications) when a plain font name like monospace-8 is given.

It would be nice to be able to use XftDefaultSubstitute to pick up the GConf 
settings from the X database (GConf puts them there).  But by the time the Xft 
driver has been choosen, the pixel size for the font has already been 
calculated, using another dpi-value.

How can we fix this?  Can we choose driver without calculating a pixel size?
The fast but kind of ugly way would be to add the defaults from 
XftDefaultSubstitute to the name if it is an fcname and Xft is present.

        Jan D.