[cairo] turn off antialiasing

[Keith Packard]

Around 16 o'clock on Mar 7, Kent Sandvik wrote:

> Concerning Cairo and embedded systems with non-optimal LCD displays,
> then turning off antialiasing would very much improve the performance,
> especially with smaller objects, texts, and so on... --Kent

I've been experimenting with lower-precision AA for embedded devices.  I 
should have some "real" data around OLS for my 'twin' window system which 
includes a cairo-lite graphics system, compositing window system and 
(currently primitive) toolkit.

So far, performance seems adequate, even with anti-aliasing, and 
appearance on tiny screens is certainly better with even limited AA than 
without.

When going further down-scale, I've done a sample monochome graphics 
library (twing) that does sub-pixel positioned paths but no anti-aliasing 
(the targe LCD is strictly monochrome).

I think if you've got color, you should try lower-precision AA and see if 
it's fast enough; cairo's big problem right now is mostly cheezy 
algorithms for the core graphics operations, something Carl is busy 
working on fixing.

-keith.


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