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Date: Tue, 15 Aug 2017 12:37:39 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] bugreport gschem on OS-X 12.6 graphics plotz
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Hi Evan,

On Tue, 15 Aug 2017, Evan Foss (evanfoss AT gmail DOT com) [via 
geda-user AT delorie DOT com] wrote:
> I work with someone who is trying to migrate over to gEDA and is trying 
> to use it on a mac. He installed via brew with geda-gaf-1.8.2 and is 
> seeing some strange graphical errors. Has anyone seen this kind of issue 
> before? Attached is an example of what happens when you try to draw a 
> netline.

AFAICT, this is rendered correctly except for the background color which 
has been replaced with #dcdad5 in some areas.

This color is not defined in gEDA/gaf, so my guess is that it's the user 
interface's default color, and for some reason, an area which is requested 
to be redrawn which gschem assumes to be unchanged has actually been 
filled with the default color by the toolkit.

This looks like an issue with Cairo/GTK on Mac.  Someone with access to 
Mac hardware would have to validate that this is actually the problem, and 
find a way to request that area not to be filled.

Simply filling the area with gschem's background color won't do the trick 
as it would cause unwanted visual flickering; you'd have to actually 
prevent it from being filled with the wrong color in the first place.

Roland