STR #3384

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STR #3384

Application:FLTK Library
Status:5 - New
Priority:3 - Moderate, e.g. unable to compile the software
Scope:2 - Specific to an operating system
Subsystem:Core Library
Summary:setting up an offscreen area crashes when no Window exists yet (X11 only)
Created By:meixner
Assigned To:Unassigned
Fix Version:Unassigned
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#1 meixner
06:09 May 17, 2017
The graphics context fl_gc is set up during creation of the first window. Therefore, when creating an offscreen area before setting up the first window, XSetClipMask is invoked with fl_gc==NULL which results in a crash.

Call stack is:

fl_begin_offscreen() => fl_push_no_clip() =>  Fl_Graphics_Driver::push_no_clip() => fl_restore_clip() => Fl_Graphics_Driver::restore_clip() => XSetClipMask()
#2 AlbrechtS
07:07 May 17, 2017
Thanks for the report, but FLTK 1.3.3 is a very old release.

Please test at least 1.3.4 or - much better - a current snapshot of FLTK 1.4.0. ISTR that something similar to what you report has been fixed, although I'm not sure about the details. In FLTK 1.4.0 offscreen drawing has undergone a major redesign.

If you find that the bug still exists in FLTK 1.3.4 and/or 1.4.0: please post a minimal, but complete (compilable) demo program that exhibits the bug. Use the 'Post File' link. This will make it much easier to find the bug (if it still exists). TIA
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