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/* -*- mode: c++; c-basic-offset: 4 -*- */
#include <Python.h>
#define NO_IMPORT_ARRAY
#include "numpy/arrayobject.h"
#include "CXX/Objects.hxx"
#include "agg_trans_affine.h"
/** A helper function to convert from a Numpy affine transformation matrix
* to an agg::trans_affine. If errors = false then an Identity transform is returned.
*/
agg::trans_affine
py_to_agg_transformation_matrix(PyObject* obj, bool errors = true)
{
PyArrayObject* matrix = NULL;
/** If None either raise a TypeError or return an agg identity transform. */
if (obj == Py_None)
{
if (errors)
{
throw Py::TypeError("Cannot convert None to an affine transform.");
}
return agg::trans_affine();
}
/** Try turning the object into an affine transform matrix. */
try
{
matrix = (PyArrayObject*) PyArray_FromObject(obj, PyArray_DOUBLE, 2, 2);
if (!matrix)
throw std::exception();
}
catch (...)
{
Py_XDECREF(matrix);
if (errors)
{
throw Py::TypeError("Unable to get an affine transform matrix from the given object.");
}
return agg::trans_affine();
}
/** Try turning the matrix into an agg transform. */
try
{
if (PyArray_NDIM(matrix) == 2 || PyArray_DIM(matrix, 0) == 3 || PyArray_DIM(matrix, 1) == 3)
{
size_t stride0 = PyArray_STRIDE(matrix, 0);
size_t stride1 = PyArray_STRIDE(matrix, 1);
char* row0 = PyArray_BYTES(matrix);
char* row1 = row0 + stride0;
double a = *(double*)(row0);
row0 += stride1;
double c = *(double*)(row0);
row0 += stride1;
double e = *(double*)(row0);
double b = *(double*)(row1);
row1 += stride1;
double d = *(double*)(row1);
row1 += stride1;
double f = *(double*)(row1);
Py_XDECREF(matrix);
return agg::trans_affine(a, b, c, d, e, f);
}
throw std::exception();
}
catch (...)
{
if (errors)
{
Py_XDECREF(matrix);
throw Py::TypeError("Invalid affine transformation matrix.");
}
}
Py_XDECREF(matrix);
return agg::trans_affine();
}
bool
py_convert_bbox(PyObject* bbox_obj, double& l, double& b, double& r, double& t)
{
PyArrayObject* bbox = NULL;
if (bbox_obj == Py_None)
return false;
try
{
bbox = (PyArrayObject*) PyArray_FromObject(bbox_obj, PyArray_DOUBLE, 2, 2);
if (!bbox || PyArray_NDIM(bbox) != 2 || PyArray_DIM(bbox, 0) != 2 || PyArray_DIM(bbox, 1) != 2)
{
throw Py::TypeError
("Expected a bbox array");
}
l = *(double*)PyArray_GETPTR2(bbox, 0, 0);
b = *(double*)PyArray_GETPTR2(bbox, 0, 1);
r = *(double*)PyArray_GETPTR2(bbox, 1, 0);
t = *(double*)PyArray_GETPTR2(bbox, 1, 1);
Py_XDECREF(bbox);
bbox = NULL;
return true;
}
catch (...)
{
Py_XDECREF(bbox);
bbox = NULL;
throw;
}
return false;
}
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