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Re: [h-e-w] emacs 21.2 and ClearType

From: Jason Rumney
Subject: Re: [h-e-w] emacs 21.2 and ClearType
Date: 04 Apr 2002 22:36:44 +0100
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Allan Erskine <address@hidden> writes:

> has anyone noticed that emacs 21.2 doesn't use ClearType anymore on
> its default font under XP (apart from on some of the large or bold
> headings in e.g. info or the customise buffers).

The anti-aliasing on the large fonts is normal anti-aliasing, not
sub-pixel anti-aliasing.

> Emacs 21.1 works fine.

No, it doesn't.  Sometimes it draws outside the bounding-box for
the glyph, which results in a garbaged display when scrolling.  That
is why sub-pixel anti-aliasing was disabled for 21.2.  If you can find
any documentation from Microsoft about how to determine the REAL
bounding box for a glyph AFTER sub-pixel anti-aliasing is applied,
then please tell me.

Jason Rumney

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