GNU bug report logs - #8863
23.3; Strikethrough won't display on MacOS

Previous Next

Full log

View this message in rfc822 format

From: Alp Aker <alp.tekin.aker <at> gmail.com>
To: 8863 <at> debbugs.gnu.org
Subject: bug#8863: 23.3; Strikethrough won't display on MacOS
Date: Sat, 02 Jul 2011 01:53:28 -0400

> Dave Abrahams <dave <at> boostpro.com> writes:
>
> No, but the enclosed 2 patches, together, seem to.  Would somebody apply
> these, please?

I mentioned some problems with Chong Yidong's suggestion, one of which
still applies here: this patch won't work with stretch or image glyphs
(so, e.g., it won't do strike-through on tab characters).  

Also (something I didn't mention in the earlier post), this uses the
same Quartz drawing API as the existing code for underlining, and so
suffers from a problem that exists in that case as well; this kind of
line-drawing is subject to anti-aliasing effects that will cause lines
whose requested thickness is 1 pixel to appear thicker than that
(specifically, the line-drawing commands in question stroke lines so
that they're centered on their specified paths, and so a line whose
thickness is an odd number of pixels is dithered, making it look
thicker).

Last week I promised a patch that would implement strike-through and
overline face attributes and address problems with the existing
implementation of underlining.  I'll try to finish that up and post it
tomorrow.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.