gui_set_screen (3) - Linux Manuals
gui_set_screen: Changes the bitmap surface GUI routines draw to. Allegro game programming library.
NAME
gui_set_screen - Changes the bitmap surface GUI routines draw to. Allegro game programming library.SYNOPSIS
#include <allegro.h>
void gui_set_screen(BITMAP *bmp);
DESCRIPTION
This function can be used to change the bitmap surface the GUI routines draw to. This can be useful if you are using a double buffering or page flipping system. Passing NULL will cause the default surface (screen) to be used again. Example:
BITMAP *page[2]; /* Allocate two pages of video memory */ page[0] = create_video_bitmap(SCREEN_W, SCREEN_H); page[1] = create_video_bitmap(SCREEN_W, SCREEN_H); /* Page flip */ show_video_bitmap(page[0]); gui_set_screen(page[0]);