[cairo] Sub-pixel Font Filtering in 1.10

[Lance Hepler]

Hi Brandon!

> I'm curious to know whether anyone has thought about including proper
> support for sub-pixel font filtering in 1.10
> (https://bugs.freedesktop.org/show_bug.cgi?id=10301).
>
> Almost every distribution now includes patches to provide this in one
> form or another, and Qt has had it since version 4.2.
>
> Lance Hepler's patch
> (http://lists.freedesktop.org/archives/cairo/2009-February/016494.html)
> doesn't require any more external support than cairo needs now, and
> this is the same approach Qt has taken.

This patch is broken somehow, and I need to update it. Ideally, I
should move to a git workflow to ease patch submission. Anyways,
expect a(n) (working) update sometime in the recent future.

> It's kind of disconcerting to see all the different ways and old
> patches that the distributions use to get this functionality. It's
> been a few years since various patches and such began to spring up,
> and it would really be nice to have this support in cairo proper. Keep
> in mind that this really isn't about a developer sub-pixel API, but
> rather support for a highly-desired user-configurable font feature.

Lance Hepler