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al_lock_bitmap_region(3)                              al_lock_bitmap_region(3)

NAME
       al_lock_bitmap_region - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              ALLEGRO_LOCKED_REGION *al_lock_bitmap_region(ALLEGRO_BITMAP *bitmap,
                 int x, int y, int width, int height, int format, int flags)

DESCRIPTION
       Like al_lock_bitmap(3), but only locks a specific area of the bitmap.
       If the bitmap is a display bitmap, only that area of the texture will
       be updated when it is unlocked.  Locking only the region you indend to
       modify will be faster than locking the whole bitmap.

SEE ALSO
       ALLEGRO_LOCKED_REGION(3), ALLEGRO_PIXEL_FORMAT(3), al_unlock_bitmap(3)

Allegro reference manual                              al_lock_bitmap_region(3)