internal static NpyArray NpyArray_View(NpyArray self, NpyArray_Descr newDescr, object subtype)
{
NpyArray newArr = null;
Npy_INCREF(NpyArray_DESCR(self));
newArr = NpyArray_NewFromDescr(NpyArray_DESCR(self),
NpyArray_NDIM(self), NpyArray_DIMS(self),
NpyArray_STRIDES(self),
NpyArray_BYTES(self),
NpyArray_FLAGS(self),
false,
subtype, Npy_INTERFACE(self));
if (newArr == null)
{
return(null);
}
newArr.SetBase(self);
Npy_INCREF(self);
Debug.Assert(null == newArr.base_obj);
if (newDescr != null)
{
/* TODO: unwrap type. */
if (NpyArray_SetDescr(newArr, newDescr) < 0)
{
Npy_DECREF(newArr);
Npy_DECREF(newDescr);
return(null);
}
Npy_DECREF(newDescr);
}
return(newArr);
}
//
// Returns a view of a using prototype as the interfaceData when creating the wrapper.
// This will return the same subtype as prototype and use prototype in the __array_finalize__ call.
//
internal static NpyArray NpyArrayAccess_ViewLike(NpyArray a, NpyArray prototype)
{
Npy_INCREF(a.descr);
NpyArray ret = NpyArray_NewFromDescr(a.descr, a.nd, a.dimensions, a.strides, a.data, a.flags, false, null, Npy_INTERFACE(prototype));
ret.SetBase(a);
Npy_INCREF(a);
return(ret);
}
internal static void NpyArrayAccess_ClearUPDATEIFCOPY(NpyArray self)
{
if (NpyArray_CHKFLAGS(self, NPYARRAYFLAGS.NPY_UPDATEIFCOPY))
{
if (self.base_arr != null)
{
self.base_arr.flags &= ~NPYARRAYFLAGS.NPY_WRITEABLE;
Npy_DECREF(self.base_arr);
self.SetBase(null);
}
self.flags &= ~NPYARRAYFLAGS.NPY_UPDATEIFCOPY;
}
}
internal static NpyArray NpyArray_BASE_ARRAY_Update(NpyArray arr, NpyArray newArr)
{
arr.SetBase(arr);
return(arr.base_arr);
}