[Rd] text() with large cex parameter crashes X11() (PR#553)

[Martyn Plummer]

On 23-May-00 Prof Brian Ripley wrote:
>> RLoadFont ignores the fact that it has failed to load a font
>> and returns a null pointer. 
> 
> I think it is SetFont that ignores the null pointer.

Yes.

>> If this works for you it is perhaps because you have the size 34 font
>> (the last resort) on your system.
> 
> I at least have Helvetica in type 1 and so do have 120pt Helevetica
> (and have used such a system all the time I have been using X11).
> 
>> R-devel gives the same result.

Apparently I had an error in the configuration file for the font server
(due to the fact that RPM kept the old configuration file when I upgraded)
As a result, all my 75dpi fonts were considered non-scaleable by the
font server. I have now fixed this and everything works.
 
> What should we do in this circumstance?  Drop back to fixed?  Try a
> smaller size?   What sizes do you have?   A quick look around on an R6.0
> system suggests that it has 8,10,12,14,18,24, which is what Solaris
> has as bitmaps too.  And at this point basefontsize must have succeeded.
> So should we:
> 
> try 34 then 24 then basefontsize.
> 
> Should we issue a warning if the displayed fontsize differs by more than
> 10%, say, from that requested?

This seems like a good plan.  If failure to load a large font is indicative
of a problem with the X setup then it would be a good idea to issue a warning.

Sorry to trouble everyone over what is basically a problem with my setup.

Martyn
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