APPROVE COMMIT 21.5 Index: man/ChangeLog =================================================================== RCS file: /pack/xemacscvs/XEmacs/xemacs/man/ChangeLog,v retrieving revision 1.275 diff -u -U0 -r1.275 ChangeLog --- man/ChangeLog 7 Dec 2004 12:52:45 -0000 1.275 +++ man/ChangeLog 10 Dec 2004 06:33:53 -0000 ＠＠ -0,0 +1,5 ＠＠ +2004-12-10 Stephen J. Turnbull <stephen(a)xemacs.org&gt; + + * internals/internals.texi (Better Rendering Support -- + Implementation): Document reasons for Label Widget crash. + ＠＠ -360 +364,0 ＠＠ ->>>>>>> 1.271 Index: man/internals/internals.texi =================================================================== RCS file: /pack/xemacscvs/XEmacs/xemacs/man/internals/internals.texi,v retrieving revision 1.55 diff -u -r1.55 internals.texi --- man/internals/internals.texi 6 Dec 2004 03:51:35 -0000 1.55 +++ man/internals/internals.texi 10 Dec 2004 06:32:26 -0000 ＠＠ -23137,6 +23137,21 ＠＠ engine interface'' to ``text'' seems like a plausible way to focus this work. +Further evidence for this kind of approach is a bug recently fixed in +the ＠samp{xft-sjt} branch. XEmacs was crashing because the Athena Label +widget tried to access a nonexistent font in its initialization +routine. The font didn't exist because although no core X11 font +corresponding to the spec existed, an Xft font was found. So the XEmacs +font instance existed but it did not specify an X11 core font, only the +Xft font. When this object was used to initialize the font for the +Label widget, None (0) was passed to XtSetArgs, then XtCreateWidget was +called, and the internal initialization routine attempted to access that +(nonexistent) font while computing an X11 graphics context (GC). + +A similar issue applies to colors, but there Xft colors keep the pixel +data internally, so (serendipitously) the X11 color (＠emph{i.e.}, pixel) +member does get updated. + ＠item Colors, fonts, and faces Besides the rendering engine itself, the XEmacs implementations of these objects are poorly supported by current widget implementations, -- Graduate School of Systems and Information Engineering University of Tsukuba http://turnbull.sk.tsukuba.ac.jp/ Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Economics of Information Communication and Computation Systems Experimental Economics, Microeconomic Theory, Game Theory