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al_update_display_region(3)                        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 improve performance.

       The ALLEGRO_UPDATE_DISPLAY_REGION option (see al_get_display_option(3))
       will specify the behavior of this function in the display.

SEE ALSO
       al_flip_display(3), al_get_display_option(3)

Allegro reference manual                           al_update_display_region(3)