ellipsefill - Draws a filled ellipse. Allegro game programming library.
       #include <allegro.h>
       void ellipsefill(BITMAP *bmp, int x, int y, int rx, int ry, int color);
       Draws a filled ellipse with the specified centre and radius.
       circlefill(3alleg),         ellipse(3alleg),        do_ellipse(3alleg),
       drawing_mode(3alleg), makecol(3alleg), ex12bit(3alleg)