static void set_pixel(oskar_Sky* sky, int i, int x, int y, double val,
const double crval[2], const double crpix[2], const double cdelt[2],
double image_freq_hz, double spectral_index, int* status)
{
double ra, dec, l, m;
/* Convert pixel positions to RA and Dec values. */
l = cdelt[0] * (x + 1 - crpix[0]);
m = cdelt[1] * (y + 1 - crpix[1]);
oskar_convert_relative_directions_to_lon_lat_2d_d(1,
&l, &m, crval[0], crval[1], &ra, &dec);
/* Store pixel data in sky model. */
if (oskar_sky_num_sources(sky) <= i)
oskar_sky_resize(sky, i + 1000, status);
oskar_sky_set_source(sky, i, ra, dec, val, 0.0, 0.0, 0.0,
image_freq_hz, spectral_index, 0.0, 0.0, 0.0, 0.0, status);
}
oskar_Sky* oskar_sky_load(const char* filename, int type, int* status)
{
int n = 0;
FILE* file;
char* line = 0;
size_t bufsize = 0;
oskar_Sky* sky;
/* Check if safe to proceed. */
if (*status) return 0;
/* Get the data type. */
if (type != OSKAR_SINGLE && type != OSKAR_DOUBLE)
{
*status = OSKAR_ERR_BAD_DATA_TYPE;
return 0;
}
/* Open the file. */
file = fopen(filename, "r");
if (!file)
{
*status = OSKAR_ERR_FILE_IO;
return 0;
}
/* Initialise the sky model. */
sky = oskar_sky_create(type, OSKAR_CPU, 0, status);
/* Loop over lines in file. */
while (oskar_getline(&line, &bufsize, file) != OSKAR_ERR_EOF)
{
/* Set defaults. */
/* RA, Dec, I, Q, U, V, freq0, spix, RM, FWHM maj, FWHM min, PA */
double par[] = {0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.};
size_t num_param = sizeof(par) / sizeof(double);
size_t num_required = 3, num_read = 0;
/* Load source parameters (require at least RA, Dec, Stokes I). */
num_read = oskar_string_to_array_d(line, num_param, par);
if (num_read < num_required)
continue;
/* Ensure enough space in arrays. */
if (oskar_sky_num_sources(sky) <= n)
{
oskar_sky_resize(sky, n + 100, status);
if (*status)
break;
}
if (num_read <= 9)
{
/* RA, Dec, I, Q, U, V, freq0, spix, RM */
oskar_sky_set_source(sky, n, par[0] * deg2rad,
par[1] * deg2rad, par[2], par[3], par[4], par[5],
par[6], par[7], par[8], 0.0, 0.0, 0.0, status);
}
else if (num_read == 11)
{
/* Old format, with no rotation measure. */
/* RA, Dec, I, Q, U, V, freq0, spix, FWHM maj, FWHM min, PA */
oskar_sky_set_source(sky, n, par[0] * deg2rad,
par[1] * deg2rad, par[2], par[3], par[4], par[5],
par[6], par[7], 0.0, par[8] * arcsec2rad,
par[9] * arcsec2rad, par[10] * deg2rad, status);
}
else if (num_read == 12)
{
/* New format. */
/* RA, Dec, I, Q, U, V, freq0, spix, RM, FWHM maj, FWHM min, PA */
oskar_sky_set_source(sky, n, par[0] * deg2rad,
par[1] * deg2rad, par[2], par[3], par[4], par[5],
par[6], par[7], par[8], par[9] * arcsec2rad,
par[10] * arcsec2rad, par[11] * deg2rad, status);
}
else
{
/* Error. */
*status = OSKAR_ERR_BAD_SKY_FILE;
break;
}
++n;
}
/* Set the size to be the actual number of elements loaded. */
oskar_sky_resize(sky, n, status);
/* Free the line buffer and close the file. */
if (line) free(line);
fclose(file);
/* Check if an error occurred. */
if (*status)
{
oskar_sky_free(sky, status);
sky = 0;
}
/* Return a handle to the sky model. */
return sky;
}
oskar_Sky* oskar_sky_from_image(int precision, const oskar_Mem* image,
int image_width, int image_height, double image_ra_deg,
double image_dec_deg, double image_cellsize_deg, double image_freq_hz,
double spectral_index, int* status)
{
int i, type, x, y;
double crval[2], crpix[2], cdelt[2], val;
oskar_Sky* sky;
/* Check if safe to proceed. */
if (*status) return 0;
/* Check the image size is even. */
if ((image_width % 2) || (image_height % 2))
{
*status = OSKAR_ERR_INVALID_ARGUMENT;
return 0;
}
/* Get reference pixels and reference values in radians. */
crpix[0] = image_width / 2 + 1;
crpix[1] = image_height / 2 + 1;
crval[0] = image_ra_deg * M_PI / 180.0;
crval[1] = image_dec_deg * M_PI / 180.0;
/* Compute sine of pixel deltas for inverse orthographic projection. */
cdelt[0] = -sin(image_cellsize_deg * M_PI / 180.0);
cdelt[1] = -cdelt[0];
/* Create a sky model. */
sky = oskar_sky_create(precision, OSKAR_CPU, 0, status);
/* Store the image pixels. */
type = oskar_mem_precision(image);
if (type == OSKAR_SINGLE)
{
const float *img = oskar_mem_float_const(image, status);
for (y = 0, i = 0; y < image_height; ++y)
{
for (x = 0; x < image_width; ++x)
{
/* Check pixel value. */
val = (double) (img[image_width * y + x]);
if (val == 0.0)
continue;
set_pixel(sky, i++, x, y, val, crval, crpix, cdelt,
image_freq_hz, spectral_index, status);
}
}
}
else
{
const double *img = oskar_mem_double_const(image, status);
for (y = 0, i = 0; y < image_height; ++y)
{
for (x = 0; x < image_width; ++x)
{
/* Check pixel value. */
val = img[image_width * y + x];
if (val == 0.0)
continue;
set_pixel(sky, i++, x, y, val, crval, crpix, cdelt,
image_freq_hz, spectral_index, status);
}
}
}
/* Return the sky model. */
oskar_sky_resize(sky, i, status);
return sky;
}
static PyObject* append_sources(PyObject* self, PyObject* args)
{
oskar_Sky *h = 0;
PyObject *obj[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
oskar_Mem *ra_c, *dec_c, *I_c, *Q_c, *U_c, *V_c;
oskar_Mem *ref_c, *spix_c, *rm_c, *maj_c, *min_c, *pa_c;
PyArrayObject *ra = 0, *dec = 0, *I = 0, *Q = 0, *U = 0, *V = 0;
PyArrayObject *ref = 0, *spix = 0, *rm = 0, *maj = 0, *min = 0, *pa = 0;
int status = 0, npy_type, type, flags, num_sources, old_num;
/* Parse inputs: RA, Dec, I, Q, U, V, ref, spix, rm, maj, min, pa. */
if (!PyArg_ParseTuple(args, "OOOOOOOOOOOOO", &obj[0],
&obj[1], &obj[2], &obj[3], &obj[4], &obj[5], &obj[6],
&obj[7], &obj[8], &obj[9], &obj[10], &obj[11], &obj[12]))
return 0;
if (!(h = get_handle(obj[0]))) return 0;
/* Make sure input objects are arrays. Convert if required. */
flags = NPY_ARRAY_FORCECAST | NPY_ARRAY_IN_ARRAY;
type = oskar_sky_precision(h);
npy_type = numpy_type_from_oskar(type);
ra = (PyArrayObject*) PyArray_FROM_OTF(obj[1], npy_type, flags);
dec = (PyArrayObject*) PyArray_FROM_OTF(obj[2], npy_type, flags);
I = (PyArrayObject*) PyArray_FROM_OTF(obj[3], npy_type, flags);
Q = (PyArrayObject*) PyArray_FROM_OTF(obj[4], npy_type, flags);
U = (PyArrayObject*) PyArray_FROM_OTF(obj[5], npy_type, flags);
V = (PyArrayObject*) PyArray_FROM_OTF(obj[6], npy_type, flags);
ref = (PyArrayObject*) PyArray_FROM_OTF(obj[7], npy_type, flags);
spix = (PyArrayObject*) PyArray_FROM_OTF(obj[8], npy_type, flags);
rm = (PyArrayObject*) PyArray_FROM_OTF(obj[9], npy_type, flags);
maj = (PyArrayObject*) PyArray_FROM_OTF(obj[10], npy_type, flags);
min = (PyArrayObject*) PyArray_FROM_OTF(obj[11], npy_type, flags);
pa = (PyArrayObject*) PyArray_FROM_OTF(obj[12], npy_type, flags);
if (!ra || !dec || !I || !Q || !U || !V ||
!ref || !spix || !rm || !maj || !min || !pa)
goto fail;
/* Check size of input arrays. */
num_sources = (int) PyArray_SIZE(I);
if (num_sources != (int) PyArray_SIZE(ra) ||
num_sources != (int) PyArray_SIZE(dec) ||
num_sources != (int) PyArray_SIZE(Q) ||
num_sources != (int) PyArray_SIZE(U) ||
num_sources != (int) PyArray_SIZE(V) ||
num_sources != (int) PyArray_SIZE(ref) ||
num_sources != (int) PyArray_SIZE(spix) ||
num_sources != (int) PyArray_SIZE(rm) ||
num_sources != (int) PyArray_SIZE(maj) ||
num_sources != (int) PyArray_SIZE(min) ||
num_sources != (int) PyArray_SIZE(pa))
{
PyErr_SetString(PyExc_RuntimeError, "Input data dimension mismatch.");
goto fail;
}
/* Pointers to input arrays. */
ra_c = oskar_mem_create_alias_from_raw(PyArray_DATA(ra),
type, OSKAR_CPU, num_sources, &status);
dec_c = oskar_mem_create_alias_from_raw(PyArray_DATA(dec),
type, OSKAR_CPU, num_sources, &status);
I_c = oskar_mem_create_alias_from_raw(PyArray_DATA(I),
type, OSKAR_CPU, num_sources, &status);
Q_c = oskar_mem_create_alias_from_raw(PyArray_DATA(Q),
type, OSKAR_CPU, num_sources, &status);
U_c = oskar_mem_create_alias_from_raw(PyArray_DATA(U),
type, OSKAR_CPU, num_sources, &status);
V_c = oskar_mem_create_alias_from_raw(PyArray_DATA(V),
type, OSKAR_CPU, num_sources, &status);
ref_c = oskar_mem_create_alias_from_raw(PyArray_DATA(ref),
type, OSKAR_CPU, num_sources, &status);
spix_c = oskar_mem_create_alias_from_raw(PyArray_DATA(spix),
type, OSKAR_CPU, num_sources, &status);
rm_c = oskar_mem_create_alias_from_raw(PyArray_DATA(rm),
type, OSKAR_CPU, num_sources, &status);
maj_c = oskar_mem_create_alias_from_raw(PyArray_DATA(maj),
type, OSKAR_CPU, num_sources, &status);
min_c = oskar_mem_create_alias_from_raw(PyArray_DATA(min),
type, OSKAR_CPU, num_sources, &status);
pa_c = oskar_mem_create_alias_from_raw(PyArray_DATA(pa),
type, OSKAR_CPU, num_sources, &status);
/* Copy source data into the sky model. */
old_num = oskar_sky_num_sources(h);
oskar_sky_resize(h, old_num + num_sources, &status);
oskar_mem_copy_contents(oskar_sky_ra_rad(h), ra_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_dec_rad(h), dec_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_I(h), I_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_Q(h), Q_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_U(h), U_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_V(h), V_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_reference_freq_hz(h), ref_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_spectral_index(h), spix_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_rotation_measure_rad(h), rm_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_fwhm_major_rad(h), maj_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_fwhm_minor_rad(h), min_c,
old_num, 0, num_sources, &status);
oskar_mem_copy_contents(oskar_sky_position_angle_rad(h), pa_c,
old_num, 0, num_sources, &status);
/* Free memory. */
oskar_mem_free(ra_c, &status);
oskar_mem_free(dec_c, &status);
oskar_mem_free(I_c, &status);
oskar_mem_free(Q_c, &status);
oskar_mem_free(U_c, &status);
oskar_mem_free(V_c, &status);
oskar_mem_free(ref_c, &status);
oskar_mem_free(spix_c, &status);
oskar_mem_free(rm_c, &status);
oskar_mem_free(maj_c, &status);
oskar_mem_free(min_c, &status);
oskar_mem_free(pa_c, &status);
/* Check for errors. */
if (status)
{
PyErr_Format(PyExc_RuntimeError,
"Sky model append_sources() failed with code %d (%s).",
status, oskar_get_error_string(status));
goto fail;
}
Py_XDECREF(ra);
Py_XDECREF(dec);
Py_XDECREF(I);
Py_XDECREF(Q);
Py_XDECREF(U);
Py_XDECREF(V);
Py_XDECREF(ref);
Py_XDECREF(spix);
Py_XDECREF(rm);
Py_XDECREF(maj);
Py_XDECREF(min);
Py_XDECREF(pa);
return Py_BuildValue("");
fail:
Py_XDECREF(ra);
Py_XDECREF(dec);
Py_XDECREF(I);
Py_XDECREF(Q);
Py_XDECREF(U);
Py_XDECREF(V);
Py_XDECREF(ref);
Py_XDECREF(spix);
Py_XDECREF(rm);
Py_XDECREF(maj);
Py_XDECREF(min);
Py_XDECREF(pa);
return 0;
}