Returns the bitmap this bitmap is a sub-bitmap of. Returns NULL if this bitmap is not a sub-bitmap.
This function always returns the real bitmap, and never a sub-bitmap. This might NOT match what was
passed to al_create_sub_bitmap(3alleg5). Consider this code, for instance:
ALLEGRO_BITMAP* a = al_create_bitmap(512, 512);
ALLEGRO_BITMAP* b = al_create_sub_bitmap(a, 128, 128, 256, 256);
ALLEGRO_BITMAP* c = al_create_sub_bitmap(b, 64, 64, 128, 128);
ASSERT(al_get_parent_bitmap(b) == a && al_get_parent_bitmap(c) == a);
The assertion will pass because only a is a real bitmap, and both b and c are its sub-bitmaps.
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