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PyArray.hpp
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PyArray.hpp
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/******************************************************************************
* Copyright (c) 2011, Michael P. Gerlek (mpg@flaxen.com)
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Hobu, Inc. or Flaxen Geo Consulting nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
#pragma once
#include <pdal/PointView.hpp>
#include <algorithm>
#pragma warning(disable: 4127) // conditional expression is constant
#include <Python.h>
#undef toupper
#undef tolower
#undef isspace
#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
#include <numpy/arrayobject.h>
// forward declare PyObject so we don't need the python headers everywhere
// see: http://mail.python.org/pipermail/python-dev/2003-August/037601.html
#ifndef PyObject_HEAD
struct _object;
typedef _object PyObject;
#endif
namespace pdal
{
namespace python
{
class PDAL_DLL Array
{
public:
Array() : m_py_array(0)
{}
~Array()
{
cleanup();
}
inline void update(PointViewPtr view)
{
typedef std::unique_ptr<std::vector<uint8_t>> DataPtr;
cleanup();
int nd = 1;
Dimension::IdList dims = view->dims();
npy_intp mydims = view->size();
npy_intp* ndims = &mydims;
std::vector<npy_intp> strides(dims.size());
DataPtr pdata( new std::vector<uint8_t>(view->pointSize()* view->size(), 0));
PyArray_Descr *dtype(0);
PyObject * dtype_dict = (PyObject*)buildNumpyDescription(view);
if (!dtype_dict)
throw pdal_error("Unable to build numpy dtype description dictionary");
int did_convert = PyArray_DescrConverter(dtype_dict, &dtype);
if (did_convert == NPY_FAIL)
throw pdal_error("Unable to build numpy dtype");
Py_XDECREF(dtype_dict);
#ifdef NPY_ARRAY_CARRAY
int flags = NPY_ARRAY_CARRAY;
#else
int flags = NPY_CARRAY;
#endif
uint8_t* sp = pdata.get()->data();
PyObject * pyArray = PyArray_NewFromDescr(&PyArray_Type,
dtype,
nd,
ndims,
0,
sp,
flags,
NULL);
// copy the data
uint8_t* p(sp);
DimTypeList types = view->dimTypes();
for (PointId idx = 0; idx < view->size(); idx++)
{
p = sp + (view->pointSize() * idx);
view->getPackedPoint(types, idx, (char*)p);
}
m_py_array = pyArray;
m_data_array = std::move(pdata);
}
inline PyObject* getPythonArray() const { return m_py_array; }
private:
inline void cleanup()
{
PyObject* p = (PyObject*)(m_py_array);
Py_XDECREF(p);
m_data_array.reset();
}
inline PyObject* buildNumpyDescription(PointViewPtr view) const
{
// Build up a numpy dtype dictionary
//
// {'formats': ['f8', 'f8', 'f8', 'u2', 'u1', 'u1', 'u1', 'u1', 'u1', 'f4', 'u1', 'u2', 'f8', 'u2', 'u2', 'u2'],
// 'names': ['X', 'Y', 'Z', 'Intensity', 'ReturnNumber', 'NumberOfReturns',
// 'ScanDirectionFlag', 'EdgeOfFlightLine', 'Classification',
// 'ScanAngleRank', 'UserData', 'PointSourceId', 'GpsTime', 'Red', 'Green',
// 'Blue']}
//
std::stringstream oss;
Dimension::IdList dims = view->dims();
PyObject* dict = PyDict_New();
PyObject* sizes = PyList_New(dims.size());
PyObject* formats = PyList_New(dims.size());
PyObject* titles = PyList_New(dims.size());
for (Dimension::IdList::size_type i=0; i < dims.size(); ++i)
{
Dimension::Id id = (dims[i]);
Dimension::Type t = view->dimType(id);
npy_intp stride = view->dimSize(id);
std::string name = view->dimName(id);
std::string kind("i");
Dimension::BaseType b = Dimension::base(t);
if (b == Dimension::BaseType::Unsigned)
kind = "u";
else if (b == Dimension::BaseType::Floating)
kind = "f";
else
{
std::stringstream o;
oss << "unable to map kind '" << kind <<"' to PDAL dimension type";
throw pdal::pdal_error(o.str());
}
oss << kind << stride;
PyObject* pySize = PyLong_FromLong(stride);
PyObject* pyTitle = PyUnicode_FromString(name.c_str());
PyObject* pyFormat = PyUnicode_FromString(oss.str().c_str());
PyList_SetItem(sizes, i, pySize);
PyList_SetItem(titles, i, pyTitle);
PyList_SetItem(formats, i, pyFormat);
oss.str("");
}
PyDict_SetItemString(dict, "names", titles);
PyDict_SetItemString(dict, "formats", formats);
// PyObject* obj = PyUnicode_AsASCIIString(PyObject_Str(dict));
// const char* s = PyBytes_AsString(obj);
// std::string output(s);
// std::cout << "array: " << output << std::endl;
return dict;
}
PyObject* m_py_array;
std::unique_ptr<std::vector<uint8_t> > m_data_array;
Array& operator=(Array const& rhs);
};
} // namespace python
} // namespace pdal