[fltk/fltk] HiDpi issue on macOS with retina display (#279)

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[fltk/fltk] HiDpi issue on macOS with retina display (#279) lencil 09:11 Oct 08 top right image

with FLTK 1.4

consider followed code.

#include <FL/Fl.H>
#include <FL/Fl_Gl_Window.H>

int main() {
    // auto win = new Fl_Gl_Window(400, 300);
    auto win = new Fl_Gl_Window(0, 0, 400, 300, "title");
    // win->make_current();
    printf("%f\n", Fl::screen_scale(win->screen_num()));
    printf("%f\n", win->pixels_per_unit());
    printf("%d\n", win->pixel_w());
    printf("%d\n", win->pixel_h());
    return Fl::run();

if use Fl_Gl_Window(x, y, w, h, title);
pixels_per_unit() return 1 on macOS with retina display.
pixel_w() and pixel_h() not retina size.
but in windows it works fine.

if use new Fl_Gl_Window(w, h), pixels_per_unit() return 2.

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