[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ft-devel] Rendering artifacts

From: Werner LEMBERG
Subject: Re: [ft-devel] Rendering artifacts
Date: Mon, 26 Jul 2010 17:00:32 +0200 (CEST)

> Not sure whether this is a bug, known limitation or something else
> entirely,

It's something completely different...

> but here goes:
> ftview 14 LiberationSerif-Regular.ttf [1]
> Toggling anti-aliasing ('a' key) makes it obvious that it
> significantly degrades the quality of some glyphs (the leg of 'k'
> the slashes in rationals become almost invisible)

Looking into the font's `gasp' table you can see that the font expects
anti-aliasing starting with a font size of 18ppem.  In the range
9-17ppem, you have to use B/W rendering.  ftview ignores the `gasp'
table completely – it's just a diagnosing tool, not a real user
application, thus it allows switching between AA and B/W rendering for
comparison purposes.  However, `fontconfig' or similar libraries
*must* respect this table, otherwise you get bad rendering results.

In other words: Your bug report is invalid :-)


reply via email to

[Prev in Thread] Current Thread [Next in Thread]