I was trying to create a small program that would have no onscreen GUI but that
would utilize Fl_Offscreen but it immediately cored. The following is enough to
create a core:
main() { Fl_Offscreen x=fl_create_offscreen(640,480); }
Works fine in a callback fired by Fl::run() after constructing a window.
After a little investigation it appears that the add_timeout example from the
docs doesnt work either:
The following does not work:
void callback(void*) {
printf("TICK\n");
Fl::repeat_timeout(1.0,callback);
}
main() {
Fl::add_timeout(1.0,callback);
for (;;) Fl::wait();
}
however the following does:
void callback(void*) {
printf("TICK\n");
Fl::repeat_timeout(1.0,callback);
}
main() {
Fl_Window *win=new Fl_Window(640,480,"xxx");
win->show();
Fl::add_timeout(1.0,callback);
for (;;) Fl::wait();
}
Shortening the timeout causes a segv:
void callback(void*) {
printf("TICK\n");
Fl::repeat_timeout(1.0,callback);
}
main() {
Fl_Window *win=new Fl_Window(640,480,"xxx");
win->show();
Fl::add_timeout(0.01,callback);
for (;;) Fl::wait();
}
I assume that fltk needs to have established a connection to the GUI before
things work correctly. Not a biggie for me but it would be nice to use
Fl_Offscreen to draw things without X (or Xvfb fudging).
Using fltk 1.1.9 on 64bit Linux RHAS4.
Regards
PG
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