How does libXt do resource type comparison?

[Chris Sorenson]

>

> Today's Topics:
>
> 1. How does libXt do resource type comparison? (Lucas de Sena)
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 27 May 2022 09:46:50 -0300
> From: Lucas de Sena
> To: xorg at lists.x.org
> Subject: How does libXt do resource type comparison?
> Message-ID:
> Content-Type: text/plain; charset=us-ascii
>
> Hi,
>
> I'm using libXt to write some widgets, and I'm using Xt's resource
> management system to convert string X resources to XftFont objects,
> by setting converters and destructor functions with the
> XtSetTypeConverter(3) routine.
>
> It seems that Xt can cache converted objects so it does not have to do
> the same conversion again and again.
>
> However, I'm not sure how the resource management system knows whether
> two conversions from the same from_type to the same to_type have the
> same value in order to cache the results.
>
> For example, I have set a converter from String to XftFont for me to
> draw text using Xft. How can Xt tells whether a second conversion from
> the same String to XftFont as a previous conversion has to be cached?
> Can I set a comparison function?
>

Might make more sense to ask this question on the fontconfig mailing list, I'm pretty sure KeithP still reads that list:

lists.freedesktop.org/mailman/listinfo/fontconfig