GNU bug report logs - #54564
29.0.50; [PATCH] Use gsettings font rendering entries for pgtk builds

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pieter van Prooijen <pieter.van.prooijen <at> teloden.nl>
Subject: bug#54564: closed (Re: bug#54564: 29.0.50; [PATCH] Use gsettings
 font rendering entries for pgtk builds)
Date: Fri, 13 May 2022 12:52:02 +0000

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Your bug report

#54564: 29.0.50; [PATCH] Use gsettings font rendering entries for pgtk builds

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 54564 <at> debbugs.gnu.org.

-- 
54564: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54564
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Po Lu <luangruo <at> yahoo.com>
To: Pieter van Prooijen <pieter.van.prooijen <at> teloden.nl>
Cc: 54564-done <at> debbugs.gnu.org
Subject: Re: bug#54564: 29.0.50; [PATCH] Use gsettings font rendering
 entries for pgtk builds
Date: Fri, 13 May 2022 20:51:36 +0800

Pieter van Prooijen <pieter.van.prooijen <at> teloden.nl> writes:

> Hello All,
>
> The copyright assignment paperwork came through, is it possible to
> incorporate the gsetting font rendering changes? I've attached a patch
> against the current master, let me know if I need to change anything.

Thank you.  I will install this shortly and am closing this bug.

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From: Pieter van Prooijen <pieter.van.prooijen <at> teloden.nl>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; [PATCH] Use gsettings font rendering entries for pgtk builds
Date: Fri, 25 Mar 2022 12:23:10 +0100

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Hello, 

When using the pgtk build of emacs under Wayland/Ubuntu, I noticed that
the font hinting was different from the regular X (Ubuntu supplied)
version of emacs.

I have the gsettings config for font hinting set to "full" on my
system, using the fonts tab in the gnome-tweaks tool.

It looks like Cairo defaults to the "slight" hinting setting when using
the Wayland backend for display and will only use the gsettings config
when rendering to an X backend, when it reads the current font settings
from xrdb.

I've attached a patch (against
380f0443b288c68df3762ee20d78719f08dd92ff) which applies the font
entries from gsettings (if present) when creating a font in Cairo.

Note that this patch won't dynamically re-render when emacs is already
running (like it does when changing the system font).
I made an attempt to hook into the gsettings change callback, but could
not force a re-creation of the font with the changed parameters,for
instance using a 'font-render' config changed event. Any pointers on
how to achieve this?
 
Do you think if this patch is a good approach to get the pgtk build to
use the system preferences for font hinting and anti-aliasing?

Kind Regards,

Pieter van Prooijen
    

[0001-Use-gsettings-font-rendering-entries-for-pgtk-builds.patch (text/x-patch, attachment)]

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