Re: [STUMP] TrueType Font performance issues

[Michael Filonenko]

Hi

Porting to cl-freetype2

cl-freetype2 replaces zpb-ttf and cl-vectors dependencies. All funcalls to these packages should be replaced with similar cl-freetype2 funcalls. They include

  * font caching
      https://github.com/filonenko-mikhail/clx-truetype/blob/master/font-cache.lisp#L29-L42

  * font loader
      https://github.com/filonenko-mikhail/clx-truetype/blob/master/clx-truetype.lisp#L111-L120

  * font metrics
      https://github.com/filonenko-mikhail/clx-truetype/blob/master/clx-truetype.lisp#L145-L184

  * symbol/string biboxing

      https://github.com/filonenko-mikhail/clx-truetype/blob/master/clx-truetype.lisp#L186-L269 
  * font rasterizing
      https://github.com/filonenko-mikhail/clx-truetype/blob/master/clx-truetype.lisp#L310-L499

About cl-cairo.

When I handle text drawing in stumpwm, I get clx:window (drawable surface) and clx:gcontext (graphical context) objects, which are used by clx drawing functions then.
https://github.com/sabetts/stumpwm/compare/tt-fonts#diff-7e56d08baa29d13311787486231783f2R88

Unfortunately cl-cairo2 drawing functions can't take clx:window and clx:gcontext objects. It uses internal c structures from cairo c library. So, I don't know how to port drawing functions from clx to cl-cairo in stumpwm space.

On Tue, Feb 11, 2014 at 10:00 PM, David Bjergaard <address@hidden> wrote:

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

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--
With best regards, Michael Filonenko