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 settings. 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)