I added some logic and after that I got a warning that there is a mismatch between cairo_save and cairo_restore. So I fixed that and I got it working. The cairo logic was faulty all the time but only some new lines of code triggered that warning. So I guess I was just lucky that I stopped debugging for a moment and added those few lines.
On 11/29/16 03:13, Jim Charlton wrote: > In Gtkmm (C++) you can overload the on_draw() function with your own. > This might give you a foothold in the on_draw() routine that is called > after a redraw event occurs. I guess in GTK you would have to connect a > callback function to the "draw" signal. Might help.?? > > jim... > > > On 2016-11-28 04:50 PM, zahlenm...@gmx.de wrote: >> This was one of the first things I did. Debug compilation option, debug >> CFLAGS, no stripping - without a change. The backtrace only shows 3 >> lines, my draw function and two from libc. >> The faulty address is not null. But the segfault happens after the >> return where all local variables are no longer in scope, and the >> addresses of the widget and the cairo context are valid. >> >> On 11/29/16 00:44, Alfonso Arbona Gimeno wrote: >>> Hi, >>> >>> Why don't you link against the debug version of the library so that it >>> shows you the complete stack? >>> It will give you some extra clues on why the segfault is happening. >>> >>> Regards, >>> Alfonso Arbona >>> >>> On November 29, 2016 6:17:05 AM GMT+09:00, zahlenm...@gmx.de wrote: >>> >>> For a custom widget I have a draw function. I do some drawing >>> there and >>> when I am finished I return FALSE to let the parent draw. >>> Immediately >>> after the return statement I get a segfault. gdb's backtrace >>> only shows >>> my draw function and an address I cannot associate to any object. >>> Are there some general tricks how to debug such errors? >>> >>> Kind regards >>> >>> ------------------------------------------------------------------------ >>> >>> gtk-app-devel-list mailing list >>> gtk-app-devel-list@gnome.org >>> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list >>> >> _______________________________________________ >> gtk-app-devel-list mailing list >> gtk-app-devel-list@gnome.org >> https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list > > > _______________________________________________ > gtk-app-devel-list mailing list > gtk-app-devel-list@gnome.org > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
