On Mon, May 30, 2022 at 04:31:29PM -0400, Chris Sorenson wrote: > > > > > 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@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
maybe not: fontconfig doesn't use Xt. One could read the source code to understand it. I think XtDirectConvert is what Lucas is asking about: https://gitlab.freedesktop.org/xorg/lib/libxt/-/blob/master/src/Convert.c#L644 This would be helpful as well (Xt uses Quarks for resource strings): https://tronche.com/gui/x/xlib/resource-manager/quarks.html https://tronche.com/gui/x/xlib/resource-manager/XrmStringToQuark.html -- Thomas E. Dickey <dic...@invisible-island.net> https://invisible-island.net ftp://ftp.invisible-island.net
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