Re: [ft-devel] Rendering artifacts

[malc]

On Mon, 26 Jul 2010, malc wrote:

> On Mon, 26 Jul 2010, Werner LEMBERG wrote:
> 
> > 
> > > That said i first noticed the invisibility problem while using
> > > seamonkey/firefox/whatever which all rely on fontconfig.
> > 
> > Hmm.  You should file a bug report for fontconfig.
> > 
> > > FWIW i tried using Liberation Serif under Vista and it does AA the
> > > glyphs, however the leg of k is perfectly visible.
> > 
> > Vista uses ClearType by default, not yet supported by FreeType (see
> > below)...
> > 
> > > And while at it, i'd like to point at another interesting case,
> > > namely Linux Biolinum where when using full native hinter and rgb AA
> > > the color fringing is just insane (again under Vista there's no
> > > fringing)
> > 
> > I suspect this is the same issue (this is, missing ClearType support).
> 
> Will try to opt-out of cleartype in favour of "that other" AA option
> next time i boot the box which has vista on it.

Tried it, no invisibility problem with "standard smoothing". It looks
as if this standard smoothing keeps the hinted shape and then adds very
few shaded pixels here and there.
 
[..snip..]

> I see, there was also a patch [1] posted here a while ago, i forgot
> to test Liberation Serif with this one.
> 
> >   (b) Using the result from (a) and applying a special (patented)
> >       filter to achieve a good color balance for subpixel rendering.
> > 
> > (a) gives improvements on a CRT also.
> > 
> 

With Moony's patch the leg of 'k' is not distorted too, that said Vista's
"standard smoothing" is much more subtle it seems.

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