d_box_proc, d_shadow_box_proc - Dialog procedure drawing boxes onto the screen. Allegro game programming library.
#include <allegro.h> int d_box_proc(int msg, DIALOG *d, int c); int d_shadow_box_proc(int msg, DIALOG *d, int c);
These draw boxes onto the screen, with or without a shadow.
exgui(3alleg), exrgbhsv(3alleg)