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al_update_display_region(3) Library Functions Manual al_update_display_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 specified
     region.   With  many  drivers this is not possible, but for some it can im-
     prove 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_UPDATE_DISPLAY_RE-
     GION).

SEE ALSO
     al_flip_display(3), al_get_display_option(3)

Allegro reference manual			     al_update_display_region(3)

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<https://man.freebsd.org/cgi/man.cgi?query=al_update_display_region&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>

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