TYPEMAP

TIFF			T_TIFF
TIFF *                  T_PTRREF
uint16_t		T_IV
uint32_t		T_IV
uint64_t		T_IV
tmsize_t                T_IV
toff_t                  T_IV
void *                  T_PV


INPUT

T_TIFF
   if (sv_derived_from($arg, \"Graphics::TIFF::Image\")) {
       $var = INT2PTR (TIFF, SvIV ((SV*)SvRV ($arg)));
   } else {
       croak(\"$var is not of type Graphics::TIFF::Image\");
   }


OUTPUT

T_TIFF
   sv_setref_pv($arg, \"TIFF\", (void*)$var);