[cairo] Tessellator performance patch

[Keith Packard]

On Mon, 2006-12-04 at 06:13 +0200, M Joonas Pihlaja wrote:

> These multiplications are liable to overflow 32 bits and throw 
> off the later sign checks.  Could you replace them with a 64 bit 
> version and rerun your tests?

Given the cost of 64-bit arithmetic, might it also be interesting to try
some 'reduced precision' version of this code by shifting the
coordinates by 16 bits (with suitable rounding, of course)

-- 
keith.packard at intel.com
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