matplotlib/src/py_converters.cpp at getting_started · jeromefv/matplotlib · GitHub

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#define NO_IMPORT_ARRAY

#define PY_SSIZE_T_CLEAN

#include "py_converters.h"

#include "numpy_cpp.h"

#include "agg_basics.h"

#include "agg_color_rgba.h"

#include "agg_math_stroke.h"

extern "C" {

static int convert_string_enum(PyObject *obj, const char *name, const char **names, int *values, int *result)

{

PyObject *bytesobj;

char *str;

if (obj == NULL || obj == Py_None) {

return 1;

}

if (PyUnicode_Check(obj)) {

bytesobj = PyUnicode_AsASCIIString(obj);

if (bytesobj == NULL) {

return 0;

}

} else if (PyBytes_Check(obj)) {

Py_INCREF(obj);

bytesobj = obj;

} else {

PyErr_Format(PyExc_TypeError, "%s must be str or bytes", name);

return 0;

}

str = PyBytes_AsString(bytesobj);

if (str == NULL) {

Py_DECREF(bytesobj);

return 0;

}

for ( ; *names != NULL; names++, values++) {

if (strncmp(str, *names, 64) == 0) {

*result = *values;

Py_DECREF(bytesobj);

return 1;

}

PyErr_Format(PyExc_ValueError, "invalid %s value", name);

Py_DECREF(bytesobj);

return 0;

}

int convert_from_method(PyObject *obj, const char *name, converter func, void *p)

{

PyObject *value;

value = PyObject_CallMethod(obj, name, NULL);

if (value == NULL) {

if (!PyObject_HasAttrString(obj, name)) {

PyErr_Clear();

return 1;

}

return 0;

}

if (!func(value, p)) {

Py_DECREF(value);

return 0;

}

Py_DECREF(value);

return 1;

}

int convert_from_attr(PyObject *obj, const char *name, converter func, void *p)

{

PyObject *value;

value = PyObject_GetAttrString(obj, name);

if (value == NULL) {

if (!PyObject_HasAttrString(obj, name)) {

PyErr_Clear();

return 1;

}

return 0;

}

if (!func(value, p)) {

Py_DECREF(value);

return 0;

}

Py_DECREF(value);

return 1;

}

int convert_double(PyObject *obj, void *p)

{

double *val = (double *)p;

*val = PyFloat_AsDouble(obj);

if (PyErr_Occurred()) {

return 0;

}

return 1;

}

int convert_bool(PyObject *obj, void *p)

{

bool *val = (bool *)p;

switch (PyObject_IsTrue(obj)) {

case 0: *val = false; break;

case 1: *val = true; break;

default: return 0; // errored.

}

return 1;

}

int convert_cap(PyObject *capobj, void *capp)

{

const char *names[] = {"butt", "round", "projecting", NULL};

int values[] = {agg::butt_cap, agg::round_cap, agg::square_cap};

int result = agg::butt_cap;

if (!convert_string_enum(capobj, "capstyle", names, values, &result)) {

return 0;

}

*(agg::line_cap_e *)capp = (agg::line_cap_e)result;

return 1;

}

int convert_join(PyObject *joinobj, void *joinp)

{

const char *names[] = {"miter", "round", "bevel", NULL};

int values[] = {agg::miter_join_revert, agg::round_join, agg::bevel_join};

int result = agg::miter_join_revert;

if (!convert_string_enum(joinobj, "joinstyle", names, values, &result)) {

return 0;

}

*(agg::line_join_e *)joinp = (agg::line_join_e)result;

return 1;

}

int convert_rect(PyObject *rectobj, void *rectp)

{

agg::rect_d *rect = (agg::rect_d *)rectp;

if (rectobj == NULL || rectobj == Py_None) {

rect->x1 = 0.0;

rect->y1 = 0.0;

rect->x2 = 0.0;

rect->y2 = 0.0;

} else {

PyArrayObject *rect_arr = (PyArrayObject *)PyArray_ContiguousFromAny(

rectobj, NPY_DOUBLE, 1, 2);

if (rect_arr == NULL) {

return 0;

}

if (PyArray_NDIM(rect_arr) == 2) {

if (PyArray_DIM(rect_arr, 0) != 2 ||

PyArray_DIM(rect_arr, 1) != 2) {

PyErr_SetString(PyExc_ValueError, "Invalid bounding box");

Py_DECREF(rect_arr);

return 0;

}

} else { // PyArray_NDIM(rect_arr) == 1

if (PyArray_DIM(rect_arr, 0) != 4) {

PyErr_SetString(PyExc_ValueError, "Invalid bounding box");

Py_DECREF(rect_arr);

return 0;

}

double *buff = (double *)PyArray_DATA(rect_arr);

rect->x1 = buff[0];

rect->y1 = buff[1];

rect->x2 = buff[2];

rect->y2 = buff[3];

Py_DECREF(rect_arr);

}

return 1;

}

int convert_rgba(PyObject *rgbaobj, void *rgbap)

{

agg::rgba *rgba = (agg::rgba *)rgbap;

if (rgbaobj == NULL || rgbaobj == Py_None) {

rgba->r = 0.0;

rgba->g = 0.0;

rgba->b = 0.0;

rgba->a = 0.0;

} else {

rgba->a = 1.0;

if (!PyArg_ParseTuple(

rgbaobj, "ddd|d:rgba", &(rgba->r), &(rgba->g), &(rgba->b), &(rgba->a))) {

return 0;

}

return 1;

}

int convert_dashes(PyObject *dashobj, void *dashesp)

{

Dashes *dashes = (Dashes *)dashesp;

if (dashobj == NULL && dashobj == Py_None) {

return 1;

}

PyObject *dash_offset_obj = NULL;

double dash_offset = 0.0;

PyObject *dashes_seq = NULL;

if (!PyArg_ParseTuple(dashobj, "OO:dashes", &dash_offset_obj, &dashes_seq)) {

return 0;

}

if (dash_offset_obj != Py_None) {

dash_offset = PyFloat_AsDouble(dash_offset_obj);

if (PyErr_Occurred()) {

return 0;

}

} else {

if (PyErr_WarnEx(PyExc_FutureWarning,

"Passing the dash offset as None is deprecated since "

"Matplotlib 3.3 and will be removed in Matplotlib 3.5; "

"pass it as zero instead.",

1)) {

return 0;

}

if (dashes_seq == Py_None) {

return 1;

}

if (!PySequence_Check(dashes_seq)) {

PyErr_SetString(PyExc_TypeError, "Invalid dashes sequence");

return 0;

}

Py_ssize_t nentries = PySequence_Size(dashes_seq);

// If the dashpattern has odd length, iterate through it twice (in

// accordance with the pdf/ps/svg specs).

Py_ssize_t dash_pattern_length = (nentries % 2) ? 2 * nentries : nentries;

for (Py_ssize_t i = 0; i < dash_pattern_length; ++i) {

PyObject *item;

double length;

double skip;

item = PySequence_GetItem(dashes_seq, i % nentries);

if (item == NULL) {

return 0;

}

length = PyFloat_AsDouble(item);

if (PyErr_Occurred()) {

Py_DECREF(item);

return 0;

}

Py_DECREF(item);

++i;

item = PySequence_GetItem(dashes_seq, i % nentries);

if (item == NULL) {

return 0;

}

skip = PyFloat_AsDouble(item);

if (PyErr_Occurred()) {

Py_DECREF(item);

return 0;

}

Py_DECREF(item);

dashes->add_dash_pair(length, skip);

}

dashes->set_dash_offset(dash_offset);

return 1;

}

int convert_dashes_vector(PyObject *obj, void *dashesp)

{

DashesVector *dashes = (DashesVector *)dashesp;

if (!PySequence_Check(obj)) {

return 0;

}

Py_ssize_t n = PySequence_Size(obj);

for (Py_ssize_t i = 0; i < n; ++i) {

PyObject *item;

Dashes subdashes;

item = PySequence_GetItem(obj, i);

if (item == NULL) {

return 0;

}

if (!convert_dashes(item, &subdashes)) {

Py_DECREF(item);

return 0;

}

Py_DECREF(item);

dashes->push_back(subdashes);

}

return 1;

}

int convert_trans_affine(PyObject *obj, void *transp)

{

agg::trans_affine *trans = (agg::trans_affine *)transp;

/** If None assume identity transform. */

if (obj == NULL || obj == Py_None) {

return 1;

}

PyArrayObject *array = (PyArrayObject *)PyArray_ContiguousFromAny(obj, NPY_DOUBLE, 2, 2);

if (array == NULL) {

return 0;

}

if (PyArray_DIM(array, 0) == 3 && PyArray_DIM(array, 1) == 3) {

double *buffer = (double *)PyArray_DATA(array);

trans->sx = buffer[0];

trans->shx = buffer[1];

trans->tx = buffer[2];

trans->shy = buffer[3];

trans->sy = buffer[4];

trans->ty = buffer[5];

Py_DECREF(array);

return 1;

}

Py_DECREF(array);

PyErr_SetString(PyExc_ValueError, "Invalid affine transformation matrix");

return 0;

}

int convert_path(PyObject *obj, void *pathp)

{

py::PathIterator *path = (py::PathIterator *)pathp;

PyObject *vertices_obj = NULL;

PyObject *codes_obj = NULL;

PyObject *should_simplify_obj = NULL;

PyObject *simplify_threshold_obj = NULL;

bool should_simplify;

double simplify_threshold;

int status = 0;

if (obj == NULL || obj == Py_None) {

return 1;

}

vertices_obj = PyObject_GetAttrString(obj, "vertices");

if (vertices_obj == NULL) {

goto exit;

}

codes_obj = PyObject_GetAttrString(obj, "codes");

if (codes_obj == NULL) {

goto exit;

}

should_simplify_obj = PyObject_GetAttrString(obj, "should_simplify");

if (should_simplify_obj == NULL) {

goto exit;

}

switch (PyObject_IsTrue(should_simplify_obj)) {

case 0: should_simplify = 0; break;

case 1: should_simplify = 1; break;

default: goto exit; // errored.

}

simplify_threshold_obj = PyObject_GetAttrString(obj, "simplify_threshold");

if (simplify_threshold_obj == NULL) {

goto exit;

}

simplify_threshold = PyFloat_AsDouble(simplify_threshold_obj);

if (PyErr_Occurred()) {

goto exit;

}

if (!path->set(vertices_obj, codes_obj, should_simplify, simplify_threshold)) {

goto exit;

}

status = 1;

exit:

Py_XDECREF(vertices_obj);

Py_XDECREF(codes_obj);

Py_XDECREF(should_simplify_obj);

Py_XDECREF(simplify_threshold_obj);

return status;

}

int convert_clippath(PyObject *clippath_tuple, void *clippathp)

{

ClipPath *clippath = (ClipPath *)clippathp;

py::PathIterator path;

agg::trans_affine trans;

if (clippath_tuple != NULL && clippath_tuple != Py_None) {

if (!PyArg_ParseTuple(clippath_tuple,

"O&O&:clippath",

&convert_path,

&clippath->path,

&convert_trans_affine,

&clippath->trans)) {

return 0;

}

return 1;

}

int convert_snap(PyObject *obj, void *snapp)

{

e_snap_mode *snap = (e_snap_mode *)snapp;

if (obj == NULL || obj == Py_None) {

*snap = SNAP_AUTO;

} else {

switch (PyObject_IsTrue(obj)) {

case 0: *snap = SNAP_FALSE; break;

case 1: *snap = SNAP_TRUE; break;

default: return 0; // errored.

}

return 1;

}

int convert_sketch_params(PyObject *obj, void *sketchp)

{

SketchParams *sketch = (SketchParams *)sketchp;

if (obj == NULL || obj == Py_None) {

sketch->scale = 0.0;

} else if (!PyArg_ParseTuple(obj,

"ddd:sketch_params",

&sketch->scale,

&sketch->length,

&sketch->randomness)) {

return 0;

}

return 1;

}

int convert_gcagg(PyObject *pygc, void *gcp)

{

GCAgg *gc = (GCAgg *)gcp;

if (!(convert_from_attr(pygc, "_linewidth", &convert_double, &gc->linewidth) &&

convert_from_attr(pygc, "_alpha", &convert_double, &gc->alpha) &&

convert_from_attr(pygc, "_forced_alpha", &convert_bool, &gc->forced_alpha) &&

convert_from_attr(pygc, "_rgb", &convert_rgba, &gc->color) &&

convert_from_attr(pygc, "_antialiased", &convert_bool, &gc->isaa) &&

convert_from_attr(pygc, "_capstyle", &convert_cap, &gc->cap) &&

convert_from_attr(pygc, "_joinstyle", &convert_join, &gc->join) &&

convert_from_method(pygc, "get_dashes", &convert_dashes, &gc->dashes) &&

convert_from_attr(pygc, "_cliprect", &convert_rect, &gc->cliprect) &&

convert_from_method(pygc, "get_clip_path", &convert_clippath, &gc->clippath) &&

convert_from_method(pygc, "get_snap", &convert_snap, &gc->snap_mode) &&

convert_from_method(pygc, "get_hatch_path", &convert_path, &gc->hatchpath) &&

convert_from_method(pygc, "get_hatch_color", &convert_rgba, &gc->hatch_color) &&

convert_from_method(pygc, "get_hatch_linewidth", &convert_double, &gc->hatch_linewidth) &&

convert_from_method(pygc, "get_sketch_params", &convert_sketch_params, &gc->sketch))) {

return 0;

}

return 1;

}

int convert_offset_position(PyObject *obj, void *offsetp)

{

e_offset_position *offset = (e_offset_position *)offsetp;

const char *names[] = {"data", NULL};

int values[] = {OFFSET_POSITION_DATA};

int result = (int)OFFSET_POSITION_FIGURE;

if (!convert_string_enum(obj, "offset_position", names, values, &result)) {

PyErr_Clear();

}

*offset = (e_offset_position)result;

return 1;

}

int convert_face(PyObject *color, GCAgg &gc, agg::rgba *rgba)

{

if (!convert_rgba(color, rgba)) {

return 0;

}

if (color != NULL && color != Py_None) {

if (gc.forced_alpha || PySequence_Size(color) == 3) {

rgba->a = gc.alpha;

}

return 1;

}

int convert_points(PyObject *obj, void *pointsp)

{

numpy::array_view<double, 2> *points = (numpy::array_view<double, 2> *)pointsp;

if (obj == NULL || obj == Py_None) {

return 1;

}

points->set(obj);

if (points->size() == 0) {

return 1;

}

if (points->dim(1) != 2) {

PyErr_Format(PyExc_ValueError,

"Points must be Nx2 array, got %" NPY_INTP_FMT "x%" NPY_INTP_FMT,

points->dim(0), points->dim(1));

return 0;

}

return 1;

}

int convert_transforms(PyObject *obj, void *transp)

{

numpy::array_view<double, 3> *trans = (numpy::array_view<double, 3> *)transp;

if (obj == NULL || obj == Py_None) {

return 1;

}

trans->set(obj);

if (trans->size() == 0) {

return 1;

}

if (trans->dim(1) != 3 || trans->dim(2) != 3) {

PyErr_Format(PyExc_ValueError,

"Transforms must be Nx3x3 array, got %" NPY_INTP_FMT "x%" NPY_INTP_FMT "x%" NPY_INTP_FMT,

trans->dim(0), trans->dim(1), trans->dim(2));

return 0;

}

return 1;

}

int convert_bboxes(PyObject *obj, void *bboxp)

{

numpy::array_view<double, 3> *bbox = (numpy::array_view<double, 3> *)bboxp;

if (obj == NULL || obj == Py_None) {

return 1;

}

bbox->set(obj);

if (bbox->size() == 0) {

return 1;

}

if (bbox->dim(1) != 2 || bbox->dim(2) != 2) {

PyErr_Format(PyExc_ValueError,

"Bbox array must be Nx2x2 array, got %" NPY_INTP_FMT "x%" NPY_INTP_FMT "x%" NPY_INTP_FMT,

bbox->dim(0), bbox->dim(1), bbox->dim(2));

return 0;

}

return 1;

}

int convert_colors(PyObject *obj, void *colorsp)

{

numpy::array_view<double, 2> *colors = (numpy::array_view<double, 2> *)colorsp;

if (obj == NULL || obj == Py_None) {

return 1;

}

colors->set(obj);

if (colors->size() == 0) {

return 1;

}

if (colors->dim(1) != 4) {

PyErr_Format(PyExc_ValueError,

"Colors array must be Nx4 array, got %" NPY_INTP_FMT "x%" NPY_INTP_FMT,

colors->dim(0), colors->dim(1));

return 0;

}

return 1;

}

matplotlib/src/py_converters.cpp at getting_started · jeromefv/matplotlib · GitHub

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