[cairo] gschem Performance profile dragging objects

[Peter Clifton]

Hi, I've taken another profile (sysprof) this time, having updated to
the GIT head of cairo, and libpixman 0.9.6.

In case anyone finds this interesting (or can point to any obvious low
hanging fruit for me to fix), I've put the profile online:

http://www2.eng.cam.ac.uk/~pcjc2/geda/gschem_sysprof.xml.gz

fbRasterize edges is the biggest single consumer, at 6.06% self.

About 38% cumulative goes under miTrapezoids (Belonging to the X
server?). This breaks down (additively) about:

  12% -> miCreateAlphaPicture,
  11% -> fbRasterizeTrapezoid,
  9%  -> CompositePicture,
  3%  -> FreePicture,
  3%  -> miTrapezoidBounds

About 10% cumulative goes under _cairo_surface_fallback_stroke
(Belonging to the app)

Any ideas for improvements?

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)