[poppler] LCD filtering

[Carl Worth]

On Tue, 13 May 2008 21:25:10 +0200, Tobias Wolf wrote:
> Oh, just a user here (of evince). I have subpixel rendering everywhere
> (but Evince) via the premature inclusion in Ubuntu of similar patches
> to
>
> Cairo: http://bugs.freedesktop.org/show_bug.cgi?id=10301
> and Fontconfig: http://bugs.freedesktop.org/show_bug.cgi?id=13566

For what it's worth, those patches are *not* necessary to get
sub-pixel rendering. We've had that in cairo for a very long time.

> Poppler seems not to care, and I just stumbled upon a poposed patch at:
>
> Poppler: https://bugs.freedesktop.org/show_bug.cgi?id=3307
>
> It looks like it does what you suggest, Carl, but it also does strange
> things like hard-coding the RGB order. I don't know about the caveat
> mentioned by the submitter, but the Screenshots look like they do what I
> want. The difference is striking.

The patch is bogus. Hard-coding the font options like that is
definitely wrong. But thanks for pointing out the bug report to
me---I've just commented there to describe the situation somewhat.

And again, as mentioned in the bug report, there are bigger changes
than the sub-pixel rendering in the screenshots. They're quite useless
for comparing the results of sub-pixel rendering, (in my opinion at
least).

-Carl
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