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[STR New] Link: http://www.fltk.org/str.php?L2797 Version: 1.3-current Just some additional notes culled from the ref'd thread: It appears, based on testing by the OP (David) and by me, that the crux may be in the Fl_Double_Window flush() method. If XDBE is inhibited, then at line 338 of r9209, we have an fl_offscreen created for the double buffer, which is then assigned to other_xid: myi->other_xid = fl_create_offscreen(w(), h()); Now, it is clear that the offscreen is created without first checking that the dimensions are non-zero, and that appears to be what triggers the subsequent crash... David's workaround was to do: myi->other_xid = ( w() && h() ? fl_create_offscreen(w(),h()) : 0 ); instead, i.e. only create the offscreen surface for the double buffering of the window if the window has non-zero size. Otherwise, other_xid is set to NULL. It looks like *most* other places where other_xid is used, it is checked for being NULL first, so this ought to be safe. David reports good results with this workaround in his tests, though I was initially sceptical. I'm now of the opinion that this workaround is probably good, though we need to check there are no places where other_xid is actually used without first being checked for NULL, just to be sure! Link: http://www.fltk.org/str.php?L2797 Version: 1.3-current _______________________________________________ fltk-bugs mailing list fltk-bugs@easysw.com http://lists.easysw.com/mailman/listinfo/fltk-bugs
