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from cpython.ref cimport PyObject
from math import degrees, radians
cdef double _DG2RAD = radians(1.)
cdef double _RAD2DG = degrees(1.)
cdef int _DOUBLESIZE = sizeof(double)
cdef extern from "math.h" nogil:
ctypedef enum:
HUGE_VAL
cdef extern from "Python.h":
ctypedef enum:
PyBUF_WRITABLE
int PyObject_GetBuffer(PyObject *exporter, Py_buffer *view, int flags)
void PyBuffer_Release(Py_buffer *view)
cdef class PyBuffWriteManager:
cdef Py_buffer buffer
cdef double* data
cdef public Py_ssize_t len
def __cinit__(self):
self.data = NULL
def __init__(self, object data):
if PyObject_GetBuffer(<PyObject *>data, &self.buffer, PyBUF_WRITABLE) <> 0:
raise BufferError("pyproj had a problem getting the buffer from data.")
self.data = <double *>self.buffer.buf
self.len = self.buffer.len // self.buffer.itemsize
def __dealloc__(self):
PyBuffer_Release(&self.buffer)
self.data = NULL
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