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From:	Andreas Schweizer <aschweiz AT mac DOT com>
Subject:	[geda-user] Re: Font sizes messed up in gschem on Mac OS X 10.6
Date:	Wed, 05 Oct 2011 23:59:58 +0200
Message-id:	<B795BF17-7424-4F73-A7F1-01B1AD456E1F@mac.com>
To:	geda-user AT delorie DOT com
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Reply-To:	geda-user AT delorie DOT com

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Hello,

> I'm hoping one of the gEDA users who use Mac OS X will come forward =
with
> a recipe for getting gEDA 1.6.0 working. (Or at least re-assure me =
that
> it can be made to work!)

I have exactly the same issue on Mac OS X 10.7.1 when compiling from =
sources.
The last few evenings, I've done some debugging to figure out why the =
fonts are
messed up in gschem.

It seems that the CoreText font backend which Pango uses on Mac OS X =
returns
cached fonts more often in PangoCoreTextFontMap. Specifically, it =
doesn't include
information about the resolution of the PangoContext in the key which it =
uses to
address cached fonts in the hash table. The fontconfig implementation on =
Linux=20
does include this information via an FcPattern data structure.

So, the resolution that the following line of code in o_text.c =
(setup_pango_return_
metrics) sets on the PangoContext is not considered by the CoreText code =
in Pango=20
when looking for a matching font in the font cache:

pango_cairo_context_set_resolution (context, 1000. * scale_factor);

I don't know if it would be a solution to scale the font size instead of =
the
resolution in setup_pango_return_metrics?

A "hotfix" for Pango would be to disable the font cache in Pango, more =
specifically
in src/pangocoretext-fontmap.c, function =
pango_core_text_font_map_load_font.

One could change this code...

      best_font =3D pango_core_text_font_map_lookup (ctfontmap,
                                                   context,
                                                   best_description,
                                                   best_face);
      if (best_font)=20
        g_object_ref (best_font);
      else

... to ...

      best_font =3D NULL;
      if (best_font)=20
        g_object_ref (best_font);
      else

... so that pango creates a new font instance instead of returning a =
cached one.

I have a more efficient fix locally on my machine which includes the =
size and=20
resolution in the key into the font cache so that the font cache is =
still of some
use. I'll try to create a bug report and patch for Pango.

Thanks Peter for maintaining this fantastic application!

greetings
Andreas


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