debian man page for show_video_bitmap

show_video_bitmap(3alleg4)					  Allegro manual					show_video_bitmap(3alleg4)

NAME
       show_video_bitmap - Flips the hardware screen to use the specified page. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       int show_video_bitmap(BITMAP *bitmap);

DESCRIPTION
       Attempts to page flip the hardware screen to display the specified video bitmap object, which must be the same size as the physical screen,
       and should have been obtained by calling the create_video_bitmap() function.

       Allegro will handle any necessary vertical retrace synchronisation when page flipping, so you don't need to call vsync()  before  it.  This
       means  that show_video_bitmap() has the same time delay effects as vsync() by default. This can be adjusted with the "disable_vsync" config
       key in the [graphics] section of allegro.cfg. Example:

	  int current_page;
	  BITMAP *video_page[2];
	  ...
	  /* Create pages for page flipping */
	  video_page[0] = create_video_bitmap(SCREEN_W, SCREEN_H);
	  video_page[1] = create_video_bitmap(SCREEN_W, SCREEN_H);
	  current_page = 0;
	  ...
	  /* draw the screen and flip pages */
	  draw_screen(video_page[current_page]);
	  show_video_bitmap(video_page[current_page]);
	  current_page = (current_page+1)%2;
	  ...

RETURN VALUE
       Returns zero on success and non-zero on failure.

SEE ALSO
       scroll_screen(3alleg4), create_video_bitmap(3alleg4), exaccel(3alleg4), exflip(3alleg4), exupdate(3alleg4)

Allegro 							   version 4.4.2					show_video_bitmap(3alleg4)