[cairo] sincos patch final(?) patch

[Carl Worth]

On Mon, 12 Sep 2005 23:50:26 -0400 (EDT), Behdad Esfahbod wrote:
> I updated the sincos patch to reflect Owen's feedback.  I think
> the patch can be applied now.

	[Here's an introduction to one thing I don't like about
	bugzilla. It walls off communication into small subsets of
	people. [*]]

Cairo previously had one call to sincos in its implementation. As it
turned out, that call caused problems on Tru64 where sincos apparently
doesn't work. See this bug report for details:

	Bug 4401 - cairo detects and uses buggy sincos() on Tru64,
	cairo_matrix_init_rotate

	https://bugs.freedesktop.org/show_bug.cgi?id=4401

In response to that bug report I recently removed the call to
sincos. So before we could add it back again anywhere, we would at
least have to have a workaround to avoid repeating this bug. But that
leaves me asking if any of this is worth it. Do we have any
measurements that actually indicate that using sincos is a significant
performance win?

-Carl

[*] In one attempt to avoid this problem, I've set up a cairo-bugs
mailing list to allow interested parties to follow all cairo bugzilla
traffic:

	http://cairographics.org/cgi-bin/mailman/listinfo/cairo-bugs

I'm subscribed to that and it seems to help me stay on top of things
fairly well. I sure miss threading for all bugzilla-generated mail
though.

The link above contains a funky subscription process, (through the
bugzilla watch feature), which does prevent bugzilla from sending
duplicate messages to users who are also directly involved with a bug
in some way.
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