On 17/06/2013 07:48, marco atzeri wrote: > Il 6/16/2013 4:51 PM, marco atzeri ha scritto: >> testing a octave/fltk graphics issue, I noticed that also the >> demo of fltk with GL interface has a similar issue.
Thanks for reporting this and thanks for providing the test binaries. >> On http://matzeri.altervista.org/works/fltk_gl/ >> I uploaded the before and after apperance of "gl_overlay" demo. >> >> It is enough to move the window to loose the geometrical >> image while the bars are correctly re-drawn. >> >> Running Xwin with -wgl does not show such defect, but it is >> terribly slow. So I assume it is not a fltk defect but of >> GL or XServer. I guess this should read "with -nowgl", in which case, this is a limitation of the current implementation of -wgl mode, which will require lots of work to fix. I wrote a bit about these limitations at [1] [1] http://www.cygwin.com/ml/cygwin-xfree/2012-10/msg00009.html > further experiment showed that the defect is present when the integrate > windows manager is used. With external window manager (fvwm, openbox,.. ) that > defect does not apper. > > With external window manager another defect appears, the upper > bar effect is not shown at all; while it is present on the integrated > window manager. When I tested this, it looks like the solid area controlled by the "sides" slider didn't get rendered into a separate layer when using software rendering (either -nowgl or X server in windowed mode), so this is possibly some bug or limitation in the software renderer, or possibly in a bug in the demo not recognizing the lack of capabilities of the software renderer. -- Jon TURNEY Volunteer Cygwin/X X Server maintainer -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://x.cygwin.com/docs/ FAQ: http://x.cygwin.com/docs/faq/