[cairo] Reduce number of floating point operations

[Behdad Esfahbod]

On Tue, 2006-11-21 at 15:20 -0800, Daniel Amelang wrote:
> 
> Notice though, that I said that I _do_ recommend the is_identity flag.
> I _don't_ recommend creating a general bit-field flag that tries to
> keep track of more than the identity state. 

I see.  We may also need a is_degenerate flag kind of thing.

-- 
behdad
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