Re: Default font has size 12pixels when requested 13pixels

[Jason Rumney <jasonr@gnu.org>]

Stefan Monnier wrote:
> My default font is specified via X resources:
>
> Emacs.font:     -misc-fixed-medium-r-semicondensed--13-*-*-*-*-*-*-*
>
> yet with the new font-backend, I get the 12-pixel version of that font
> (which happens to be a *lot* smaller).
>
> I'm trying to track down what's going on, but am having some trouble.
> I see the point-size of my faces going from 99 (corresponding to the
> desired 13 pixels) to 91 (corresponding to 12 pixels) at some point, but
> still can't quite figure out where that happens.
>   
This sounds similar to the problem I was having a couple of weeks back, 
which I tracked to some changes to font.c installed on the 
emacs-unicode-2 branch between 2008-01-22 and 2008-01-25 to fix the 
problems being discussed with the subject "Unicode-2 crash by 
set-face-font". One of the fixes was to stop using a previously created 
font->font_object, and instead recreate the font using font->full_name. 
On Windows, the full names were not parsable by the font creation code, 
so the size was being lost in that recreation. 12 pixels is hard-coded 
somewhere in font.c as a fallback size.

Although in your case, it looks like the full_name is being filled in a 
format that Emacs can parse, I suspect it may still be the same code 
that is causing the problem.