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Copy pathpy_converters.cpp
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521 lines (420 loc) · 12.3 KB
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#define NO_IMPORT_ARRAY
#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 bytes or unicode", 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, (char *)name, NULL);
if (value == NULL) {
if (!PyObject_HasAttrString(obj, (char *)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, (char *)name);
if (value == NULL) {
if (!PyObject_HasAttrString(obj, (char *)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;
*val = PyObject_IsTrue(obj);
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;
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;
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 {
try
{
numpy::array_view<const double, 2> rect_arr(rectobj);
if (rect_arr.dim(0) != 2 || rect_arr.dim(1) != 2) {
PyErr_SetString(PyExc_ValueError, "Invalid bounding box");
return 0;
}
rect->x1 = rect_arr(0, 0);
rect->y1 = rect_arr(0, 1);
rect->x2 = rect_arr(1, 0);
rect->y2 = rect_arr(1, 1);
}
catch (py::exception)
{
PyErr_Clear();
try
{
numpy::array_view<const double, 1> rect_arr(rectobj);
if (rect_arr.dim(0) != 4) {
PyErr_SetString(PyExc_ValueError, "Invalid bounding box");
return 0;
}
rect->x1 = rect_arr(0);
rect->y1 = rect_arr(1);
rect->x2 = rect_arr(2);
rect->y2 = rect_arr(3);
}
catch (py::exception)
{
return 0;
}
}
}
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;
Py_ssize_t nentries;
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;
}
}
if (dashes_seq == Py_None) {
return 1;
}
if (!PySequence_Check(dashes_seq)) {
PyErr_SetString(PyExc_TypeError, "Invalid dashes sequence");
return 0;
}
nentries = PySequence_Size(dashes_seq);
if (nentries % 2 != 0) {
PyErr_Format(PyExc_ValueError, "dashes sequence must have an even number of elements");
return 0;
}
for (Py_ssize_t i = 0; i < nentries; ++i) {
PyObject *item;
double length;
double skip;
item = PySequence_GetItem(dashes_seq, i);
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);
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;
}
try
{
numpy::array_view<const double, 2> matrix(obj);
if (matrix.dim(0) == 3 && matrix.dim(1) == 3) {
trans->sx = matrix(0, 0);
trans->shx = matrix(0, 1);
trans->tx = matrix(0, 2);
trans->shy = matrix(1, 0);
trans->sy = matrix(1, 1);
trans->ty = matrix(1, 2);
return 1;
}
}
catch (py::exception)
{
return 0;
}
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;
}
should_simplify = PyObject_IsTrue(should_simplify_obj);
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 if (PyObject_IsTrue(obj)) {
*snap = SNAP_TRUE;
} else {
*snap = SNAP_FALSE;
}
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_attr(pygc, "_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_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;
}
}
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