t between the Pix and other image data
   structures.  To make a Pix from other image data structures, you
   will need to understand pixel packing, pixel padding, component
   ordering and byte ordering on raster lines.  See the file pix.h
   for the specification of image data in the pix.

9. Custom memory management

   Leptonica allows you to use custom memory management (allocator,
   deallocator).  For Pix, which tend to be large, the alloc/dealloc
   functions can be set programmatically.  For all ot