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al_x_set_initial_icon - Allegro 5 API
#include <allegro5/allegro_x.h> bool al_x_set_initial_icon(ALLEGRO_BITMAP *bitmap)
On some window managers (notably Ubuntu's Unity) al_set_display_icon doesn't work and you need to use a .desktop file. But with this function you can set an icon before calling al_create_display. This works by setting the icon before XMapWindow.
5.2.3 [Unstable API]: New API.