[STUMP] TrueType Font performance issues

[David Bjergaard]

Hi All,

A number of people have wrote in mentioning slower/sluggish performance
with the using TrueType fonts in the experimental branch.  I can confirm
this.  On the face of it (pardon the pun), the strings stumpwm has to
render are small, but some people dump large outputs to messages, and an
obvious one is "C-t ?" 

I can't merge this in with the main branch until rendering performance
is significantly improved.  I've been doing some research and there are
two potentially "off the shelf" replacements/improvements:
* cl-freetype2 replacing zpb-ttf (this would allow opening otf, ttf and
  any other format supported by FreeType)
* Replace rendering with cl-cairo2 

There are examples in the cl-cairo2/tutorial directory on how to do this
with freetype2 and xlib.  

Michael: I know you don't have time to support or improve the rendering
of your patch, and that you've written clx-truetype.  Could you comment
on the feasibility of the above?  Any input is appreciated, I didn't
realize how complicated font rendering was!

Cheers,

    Dave