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The example program calls function fl_scale(double x, double y) with null x and y.
These values are not in the range of meaningful values for a scaling operation. I see that other platforms accept that in the context of the example program, but I see that as a happy border effect an FLTK app should not rely on.
Why does the example program call fl_scale(0, 0) in the first place?
About how the Cairo backend of FLTK draw points : it draws a filled rectangle of size 1 unit as shown by this code fragment
void Fl_Cairo_Graphics_Driver::point(int x, int y) {
rectf(x, y, 1, 1);
}
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