[cairo] odd line widths are slow

[Bill Spitzak]

Translate by .5,.5 before drawing odd line widths so they are aligned 
with the pixels?

Cliff Brake wrote:
> Hello,
> 
> We are running the following setup:
> 
> - PXA270 ARM CPU (520MHz)
> - xserver-kdrive-fbdev (1.4.0)
> - Cairo 1.8.8
> - libpixman: 0.17.1
> 
> What we are finding is cairo line widths (cairo_set_line_width) that
> are even numbers (2.0, 4.0) perform reasonably well.  When we set the
> line width to 1.0, 3.0 or some odd number, the Xwindows CPU
> utilization goes from 10% to around 50% in the system.  So for some
> reason odd line widths drastically reduce our app performance.
> 
> Does anyone have any idea why this might be?
> 
> Thanks,
> Cliff
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