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.
> 
> > 
> > > And a final remark, i'm using decent CRT monitor and in general do
> > > not use AA at all, it's just that a friend was preaching the
> > > ClearType to me for a while and i decided to try it out, and indeed
> > > i was pleasantly surprised (after trying different AA options here
> > > on linux and osx, i'd say that the thing doesn't look all that worse
> > > than bitmap/non-antialiased-but-well-hinted fonts)
> > 
> > ClearType consists of two components:
> > 
> >   (a) Rasterizing a font with a greatly enlarged horizontal
> >       resolution, using some nasty tricks (with help of a database of
> >       known `problematic' fonts) to make that work for old legacy
> >       fonts.  In particular, a bunch of instructions are disabled,
> >       mainly for handling diagonal strokes.  We don't have this in
> >       FreeType yet.
> 
> 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.
> > 
> 
> Yes it does.
> 

Forgot [1] http://www.mail-archive.com/address@hidden/msg02407.html 

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