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|
// The code for the interface PyQwt <-> N-D array interface
// See: http://numpy.scipy.org/array_interface.shtml.
//
// Copyright (C) 2001-2008 Gerard Vermeulen
// Copyright (C) 2000 Mark Colclough
//
// This file is part of PyQwt.
//
// PyQwt is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// PyQwt is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with PyQwt; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// In addition, as a special exception, Gerard Vermeulen gives permission
// to link PyQwt dynamically with non-free versions of Qt and PyQt,
// and to distribute PyQwt in this form, provided that equally powerful
// versions of Qt and PyQt have been released under the terms of the GNU
// General Public License.
//
// If PyQwt is dynamically linked with non-free versions of Qt and PyQt,
// PyQwt becomes a free plug-in for a non-free program.
#include <Python.h>
#include <qwt_ndarray.h>
// The NumPy Array Interface
typedef struct {
int two;
int nd;
char typekind;
int itemsize;
int flags;
Py_intptr_t *shape;
Py_intptr_t *strides;
void *data;
PyObject *descr;
} PyArrayInterface;
enum {
CONTIGUOUS = 0x1,
FORTRAN = 0x2,
ALIGNED = 0x100,
NOTSWAPPED = 0x200,
WRITABLE = 0x400,
ARR_HAS_DESCR = 0x800,
};
void trace(PyArrayInterface *source)
{
fprintf(stderr, "two: %i\n", source->two);
fprintf(stderr, "nd: %i\n", source->nd);
fprintf(stderr, "typekind: '%c'\n", source->typekind);
fprintf(stderr, "itemsize: %i\n", source->itemsize);
fprintf(stderr, "flags:");
if (source->flags & CONTIGUOUS) {
fprintf(stderr, " CONTIGUOUS");
}
if (source->flags & FORTRAN) {
fprintf(stderr, " FORTRAN");
}
if (source->flags & ALIGNED) {
fprintf(stderr, " ALIGNED");
}
if (source->flags & NOTSWAPPED) {
fprintf(stderr, " NOTSWAPPED");
}
if (source->flags & WRITABLE) {
fprintf(stderr, " WRITABLE");
}
if (source->flags & ARR_HAS_DESCR) {
fprintf(stderr, " ARR_HAS_DESCR");
}
fprintf(stderr, "\n");
fprintf(stderr, "shape: (");
if (source->nd==1) {
fprintf(stderr, "%i,", int(source->shape[0]));
} else if (source->nd>1) {
fprintf(stderr, "%i", int(source->shape[0]));
}
for (int i=1; i<source->nd; ++i) {
fprintf(stderr, ", %i", int(source->shape[0]));
}
fprintf(stderr, ")\n");
fprintf(stderr, "strides: (");
if (source->nd==1) {
fprintf(stderr, "%i,", int(source->strides[0]));
} else if (source->nd>1) {
fprintf(stderr, "%i", int(source->strides[0]));
}
for (int i=1; i<source->nd; ++i) {
fprintf(stderr, ", %i", int(source->strides[i]));
}
fprintf(stderr, ")\n");
}
int try_NDArray_to_QwtArray(PyObject *in, QwtArray<double> &out)
{
#ifdef TRACE_PYQWT
fprintf(stderr, "Qwt: try_NDArray_to_QwtArray() // QwtArray<double>\n");
#endif
if (!PyObject_HasAttrString(in, "__array_struct__")) {
return 0;
}
PyObject *csource = PyObject_GetAttrString(in, "__array_struct__");
if (!csource) { // FIXME
return 0;
}
PyArrayInterface *source =
reinterpret_cast<PyArrayInterface *>(PyCObject_AsVoidPtr(csource));
if (!source) { // FIXME
return 0;
}
#ifdef TRACE_PYQWT
trace(source);
#endif
int stride;
if ((source->two != 2)|| (source->nd != 1)) {
goto error;
}
stride = source->strides[0]/source->itemsize;
out.resize(source->shape[0]);
if (source->typekind == 'f') {
if (source->itemsize == sizeof(double)) {
double *data = reinterpret_cast<double *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(float)) {
float *data = reinterpret_cast<float *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else {
goto error;
}
} else if (source->typekind == 'i') {
if (source->itemsize == sizeof(char)) {
char *data = reinterpret_cast<char *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(short)) {
short *data = reinterpret_cast<short *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(int)) {
int *data = reinterpret_cast<int *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long)) {
long *data = reinterpret_cast<long *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long long)) {
long long *data = reinterpret_cast<long long *>(source->data);
for (double *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else {
goto error;
}
} else {
goto error;
}
Py_DECREF(csource);
return 1;
error:
Py_DECREF(csource);
PyErr_SetString(
PyExc_RuntimeError,
"The array is no 1D array containing real or signed integer types");
return -1;
}
int try_NDArray_to_QwtArray(PyObject *in, QwtArray<int> &out)
{
#ifdef TRACE_PYQWT
fprintf(stderr, "Qwt: try_NDArray_to_QwtArray() // QwtArray<int>\n");
#endif
if (!PyObject_HasAttrString(in, "__array_struct__")) {
return 0;
}
PyObject *csource = PyObject_GetAttrString(in, "__array_struct__");
if (!csource) { // FIXME
return 0;
}
PyArrayInterface *source =
reinterpret_cast<PyArrayInterface *>(PyCObject_AsVoidPtr(csource));
if (!source) { // FIXME
return 0;
}
#ifdef TRACE_PYQWT
trace(source);
#endif
int stride;
if ((source->two != 2) || (source->nd != 1)) {
goto error;
}
out.resize(source->shape[0]);
stride = source->strides[0]/source->itemsize;
if (source->typekind == 'i') {
if (source->itemsize == sizeof(char)) {
char *data = reinterpret_cast<char *>(source->data);
for (int *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(short)) {
short *data = reinterpret_cast<short *>(source->data);
for (int *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(int)) {
int *data = reinterpret_cast<int *>(source->data);
for (int *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long)) {
long *data = reinterpret_cast<long *>(source->data);
for (int *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long long)) {
long long *data = reinterpret_cast<long long *>(source->data);
for (int *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else {
goto error;
}
} else {
goto error;
}
Py_DECREF(csource);
return 1;
error:
Py_DECREF(csource);
PyErr_SetString(
PyExc_RuntimeError,
"The array is no 1D array containing signed integer types");
return -1;
}
int try_NDArray_to_QwtArray(PyObject *in, QwtArray<long> &out)
{
#ifdef TRACE_PYQWT
fprintf(stderr, "Qwt: try_NumPyArray_to_QwtArray() // QwtArray<long>\n");
#endif
if (!PyObject_HasAttrString(in, "__array_struct__")) {
return 0;
}
PyObject *csource = PyObject_GetAttrString(in, "__array_struct__");
if (!csource) { // FIXME
return 0;
}
PyArrayInterface *source =
reinterpret_cast<PyArrayInterface *>(PyCObject_AsVoidPtr(csource));
if (!source) { // FIXME
return 0;
}
#ifdef TRACE_PYQWT
trace(source);
#endif
int stride;
if ((source->two != 2) || (source->nd != 1)) {
goto error;
}
out.resize(source->shape[0]);
stride = source->strides[0]/source->itemsize;
if (source->typekind == 'i') {
if (source->itemsize == sizeof(char)) {
char *data = reinterpret_cast<char *>(source->data);
for (long *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(short)) {
short *data = reinterpret_cast<short *>(source->data);
for (long *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(int)) {
int *data = reinterpret_cast<int *>(source->data);
for (long *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long)) {
long *data = reinterpret_cast<long *>(source->data);
for (long *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else if (source->itemsize == sizeof(long long)) {
long long *data = reinterpret_cast<long long *>(source->data);
for (long *it = out.begin(); it != out.end();) {
*it++ = *data;
data += stride;
}
} else {
goto error;
}
} else {
goto error;
}
Py_DECREF(csource);
return 1;
error:
Py_DECREF(csource);
PyErr_SetString(
PyExc_RuntimeError,
"The array is no 1D array containing signed integer types");
return -1;
}
int try_NDArray_to_QImage(PyObject *in, QImage **out)
{
#ifdef TRACE_PYQWT
fprintf(stderr, "Qwt: try_NDArray_to_QImage()\n");
#endif
if (!PyObject_HasAttrString(in, "__array_struct__")) {
return 0;
}
PyObject *csource = PyObject_GetAttrString(in, "__array_struct__");
if (!csource) { // FIXME
return 0;
}
PyArrayInterface *source =
reinterpret_cast<PyArrayInterface *>(PyCObject_AsVoidPtr(csource));
if (!source) { // FIXME
return 0;
}
#ifdef TRACE_PYQWT
trace(source);
#endif
if (!((source->two==2) && (source->nd==2) && (source->flags&CONTIGUOUS))) {
Py_DECREF(csource);
PyErr_SetString(PyExc_RuntimeError,
"Image array must be an contiguous 2-D array");
return -1;
}
const int nx = source->shape[0];
const int ny = source->shape[1];
const int xstride = source->strides[0];
const int ystride = source->strides[1];
// 8 bit data
if ((source->typekind =='u') && (source->itemsize==1)) {
#if QT_VERSION < 0x040000
if (!(*out = new QImage(nx, ny, 8, 256))) {
#else
if (!(*out = new QImage(nx, ny, QImage::Format_Indexed8))) {
#endif
PyErr_SetString(PyExc_RuntimeError,
"failed to create a 8 bit image");
return -1;
}
for (int j=0; j<ny; j++) {
char *line = (char *)((*out)->scanLine(j));
char *data = (char *)(source->data) + j*ystride;
for (int i=0; i<nx; i++) {
*line++ = data[0];
data += xstride;
}
}
// initialize the palette as all gray
(*out)->setNumColors(256);
for (int i = 0; i<(*out)->numColors(); i++) {
(*out)->setColor(i, qRgb(i, i, i));
}
Py_DECREF(csource);
return 1;
}
// 32 bit data.
// FIXME: what does it do on a 64 bit platform?
// FIXME: endianness
if ((source->typekind=='u') && (source->itemsize==4)) {
#if QT_VERSION < 0x040000
if (!(*out = new QImage(nx, ny, 32))) {
#else
if (!(*out = new QImage(nx, ny, QImage::Format_ARGB32))) {
#endif
PyErr_SetString(PyExc_RuntimeError,
"failed to create a 32 bit image");
return -1;
}
for (int j=0; j<ny; j++) {
char *line = (char *)((*out)->scanLine(j));
char *data = (char *)(source->data) + j*ystride;
for (int i=0; i<nx; i++) {
*line++ = data[0];
*line++ = data[1];
*line++ = data[2];
*line++ = data[3];
data += xstride;
}
}
Py_DECREF(csource);
return 1;
}
PyErr_SetString(PyExc_RuntimeError,
"Data type must be an 'unsigned int' having 8 or 32 bits");
Py_DECREF(csource);
return -1;
}
// Local Variables:
// mode: C++
// c-file-style: "stroustrup"
// indent-tabs-mode: nil
// End:
|
