[cairo] Tessellator performance patch

[Behdad Esfahbod]

On Mon, 2006-12-04 at 19:35 -0500, Rafael Villar Burke wrote:
> 
> +    cairo_bool_t proper_intersection = (!(crossp_abc > 0) ^ 
> !(crossp_abd > 0)) &&
> +        (!(crossp_cda > 0) ^ !(crossp_cdb > 0)); 

Nitpicking:  Isn't !x ^ !y equivalent to x ^ y?

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