Xkb provides a number of functions to allocate and free subcomponents of a keyboard geometry. Use these
functions to create or modify keyboard geometries. Note that these functions merely allocate space for
the new element(s), and it is up to you to fill in the values explicitly in your code. These allocation
functions increase sz_* but never touch num_* (unless there is an allocation failure, in which case they
reset both sz_* and num_* to zero). These functions return Success if they succeed, BadAlloc if they are
not able to allocate space, or BadValue if a parameter is not as expected.
XkbAllocGeomShapes allocates space for num_needed shapes in the specified geometry geom. The shapes are
not initialized.
To free geometry shapes, use XkbFreeGeomShapes.