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Date: Wed, 2 Sep 2020 23:45:18 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Subject: Re: [geda-help] Shifting Text
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On Wed, Sep 02, 2020 at 10:48:31AM -0400, Glen W. Ruch (gw DOT ruch AT yahoo DOT com) 
[via geda-help AT delorie DOT com] wrote:
> [ruchg AT localhost ~]$ dnf list installed | grep pango
> […] 1.44.7-2.fc32 […]

I see.  From version 1.44 on, Pango switched from FreeType to HarfBuzz for 
font rendering, which is causing a lot of issues.  I assume this is one of 
them.

> If you want me to compile, it will take me some time to find the source 
> and download.?? - - - assuming I find all the dependencies etc.

This would be really helpful.  Debian has `apt-get build-dep geda-gaf' to 
install all build dependencies for geda-gaf; I assume Fedora has a similar 
feature.  I can't reproduce the bug on my machine, so I need feedback from 
someone who can in order to see if the metric cache is actually what's 
causing the issue.


On Wed, 2 Sep 2020, Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via 
geda-help AT delorie DOT com] wrote:
> The rendering issues have been introduced in the new version of 
> Pango---1.44.  We've have been already fixed many of them in Lepton 
> 1.9.11 (Lepton is a fork of 'geda-gaf').

I had a look at these fixes.  If I understand it correctly, you ditched 
baseline alignment completely and use the "logical" text boundaries for 
text alignment which introduces a large gap between the text and the 
anchor point for both "lower" and "upper" alignment.

As a rationale, you wrote in the commit message that "the 
'pango_font_metrics*()' functions […] were considered unstable and we used 
them at our own risk".  Do you have any reference for this?

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