centos man page for create_sub_bitmap

create_sub_bitmap(3alleg4)					  Allegro manual					create_sub_bitmap(3alleg4)

NAME
       create_sub_bitmap - Creates a memory sub bitmap. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       BITMAP *create_sub_bitmap(BITMAP *parent, int x, y, width, height);

DESCRIPTION
       Creates	a sub-bitmap, ie. a bitmap sharing drawing memory with a pre-existing bitmap, but possibly with a different size and clipping set-
       tings. When creating a sub-bitmap of the mode-X screen, the x position must be a multiple of four. The  sub-bitmap  width  and  height  can
       extend beyond the right and bottom edges of the parent (they will be clipped), but the origin point must lie within the parent region.

RETURN VALUE
       Returns a pointer to the created sub bitmap, or NULL if the sub bitmap could not be created. Remember to free the sub bitmap before freeing
       the parent bitmap to avoid memory leaks and potential crashes accessing memory which has been freed.

SEE ALSO
       create_bitmap(3alleg4),	   create_bitmap_ex(3alleg4),	  destroy_bitmap(3alleg4),     is_sub_bitmap(3alleg4),	    clear_bitmap(3alleg4),
       clear_to_color(3alleg4), expat(3alleg4), exscroll(3alleg4), exswitch(3alleg4)

Allegro 							   version 4.4.2					create_sub_bitmap(3alleg4)