[devel] XLFD font naming convention

[Ilya Anfimov]

On Mon, Mar 04, 2019 at 05:29:10PM +0100, Lucien Gentis wrote:
> 
> Le 04/03/2019 ?? 16:20, Ilya Anfimov a ??crit :
> > On Fri, Mar 01, 2019 at 06:09:02PM +0100, Lucien Gentis wrote:

[skipped]

> > > 
> > > we get scalable fonts with fields 7,8,12 at "0" like :
> > > 
> > > -bitstream-charter-medium-i-normal--0-0-75-75-p-0-iso8859-1
> > > -dec-terminal-medium-r-normal--0-0-75-75-c-0-dec-dectech
> > > 
> > > but if we call :
> > > 
> > > XListFonts(serveur, "-*-*-*-*-*-*-0-*-*-*-*-*-*-*", 10000, &nbFonts);
> > > 
> > > we also get fonts with only field 7 at "0" like :
> > > 
> > > -bitstream-charter-bold-r-normal--0-120-100-100-p-0-iso8859-1
> > > -adobe-new century schoolbook-bold-r-normal--0-120-100-100-p-0-iso10646-1
> > > 
> > > what about these fonts ?
> >   Well, X Logical Font Description Conventions
> >                  Version 1.5
> > 		says (section 5):
> > 
> >    "For a scalable font source, a scalable font name for each
> >    character set is included in the list.  In addition to
> >    the scalable font name, specific derived instance names
> >    may also be included in the list."
> >    ...
> >    "Because some existing applications rely on seeing a collection
> >    of point and pixel sizes, server vendors are strongly
> >    encouraged in the near term to provide a mechanism for
> >    including, for each scalable font name, a set of specific
> >    derived instance names. For font sources that contain a set of
> >    specific derived instance names."
> > 
> >   So  it  is OK to have that in font list. It must be --0-0-  base
> > name for every such font, and if it is not -- there is  an  error
> > somewhere in your X server or font server, and probably should be
> > fixed. If there are base entries -- then you  don't need them.
> But how to determine if a font is scalable or not when its fields 7, 8 and
> 12 are not at "0" ?

 Why do you need it?
 Usually you can safely assume, that this font is not scalable.