[cairo] Very slow performance

[Keith Packard]

Around 15 o'clock on Dec 23, Chris wrote:

> At least in my test here, pixman_fill_rect_32bbp is by far the biggest
> user of time.
> 
> Are there possibly some super-fast routines that would work here?

I think MMX or SSE might be able to get better memory bandwidth than the 
current dumb loop.  Experimentation would be welcome.

-keith


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