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al_update_...lay_region(3) Library Functions Manual al_update_...lay_region(3)

NAME
       al_update_display_region	- Allegro 5 API

SYNOPSIS
	      #include <allegro5/allegro.h>

	      void al_update_display_region(int	x, int y, int width, int height)

DESCRIPTION
       Does the	same as	al_flip_display(3), but	tries to update	only the spec-
       ified  region.  With many drivers this is not possible, but for some it
       can improve performance.	 If this is not	supported, this	function falls
       back to the behavior of al_flip_display(3).  You	can query the  support
       for  this  function  using  al_get_display_option(display,  ALLEGRO_UP-
       DATE_DISPLAY_REGION).

SEE ALSO
       al_flip_display(3), al_get_display_option(3)

Allegro	reference manual			    al_update_...lay_region(3)

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<https://man.freebsd.org/cgi/man.cgi?query=al_update_display_region&sektion=3&manpath=FreeBSD+Ports+14.3.quarterly>

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