Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!igor!twinkie!drk
From: drk@twinkie.Rational.COM (David Kaelbling)
Newsgroups: comp.windows.x
Subject: Multiple GCs sharing fonts vs. XFreeGC
Keywords: GC,font,sharing,BadFont
Message-ID: <625@igor.Rational.COM>
Date: 11 Apr 90 22:10:10 GMT
Sender: news@Rational.COM
Lines: 29


I've run into problems sharing fonts in a widget I'm writing, and
wondered if anyone could straighten me out.  I'm running X.V11R4 with
fixes 1..9 installed on a Sun 3/80 under SunOS 4.0.3.  Everything is
compiled with gcc-1.35.

My widget has a font resource which supplies (via the usual toolkit
magic) a default XFontStruct*.  I create several GCs using this
default font->fid.  All goes smoothly until I attempt to exit.

When my destroy procedure calls XFreeGC on the second GC I created, it
dies with a BadFont error.  Xscope reveals that the first call to
XFreeGC issued a CloseFont request which released my font_id!

Having several GCs using the same font id doesn't seem like too
radical an idea (I don't see any way to reconstruct a font name for
another call XLoadFont), and I didn't see any red flags in the
documentation about common pitfalls.  My fid is a real font id, not a
context id in disquise.  Somebody else must have tried this.  Where
have I gone wrong?  (It's only obvious if you understand it?)

	Thanks,
	    David (drk@Rational.COM)

PS:  Why, oh why, doesn't the toolkit manage fonts and XFontStructs?
--
David Kaelbling                                       (408) 496-3600
c/o Rational; 3320 Scott Boulevard; Santa Clara, CA       95054-3197
Email: drk@Rational.COM, or uucp {uunet,ubvax,amdcad,aeras}!igor!drk