al_lock_bitmap_region

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al_lock_bitmap_region(3alleg5)	referred by	al_is_bitmap_locked(3alleg5) \| al_lock_bitmap(3alleg5) \| al_lock_bitmap_region_blocked(3alleg5) \| al_unlock_bitmap(3alleg5) \| ALLEGRO_LOCKED_REGION(3alleg5)
al_lock_bitmap_region(3alleg5)	refer to	al_get_pixel_block_height(3alleg5) \| al_get_pixel_block_width(3alleg5) \| al_lock_bitmap(3alleg5) \| al_unlock_bitmap(3alleg5) \| ALLEGRO_LOCKED_REGION(3alleg5) \| ALLEGRO_PIXEL_FORMAT(3alleg5)