matplotlib/src/_ttconv.cpp at boxplot-stat-transforms · phobson/matplotlib · GitHub

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/* -*- mode: c++; c-basic-offset: 4 -*- */

_ttconv.c

Python wrapper for TrueType conversion library in ../ttconv.

#include "mplutils.h"

#include <Python.h>

#include "ttconv/pprdrv.h"

#include "py_exceptions.h"

#include <vector>

#include <cassert>

/**

* An implementation of TTStreamWriter that writes to a Python

* file-like object.

class PythonFileWriter : public TTStreamWriter

{

PyObject *_write_method;

public:

PythonFileWriter()

{

_write_method = NULL;

}

~PythonFileWriter()

{

Py_XDECREF(_write_method);

}

void set(PyObject *write_method)

{

Py_XDECREF(_write_method);

_write_method = write_method;

Py_XINCREF(_write_method);

}

virtual void write(const char *a)

{

PyObject *result = NULL;

if (_write_method) {

PyObject *decoded = NULL;

decoded = PyUnicode_DecodeLatin1(a, strlen(a), "");

if (decoded == NULL) {

throw py::exception();

}

result = PyObject_CallFunction(_write_method, (char *)"O", decoded);

Py_DECREF(decoded);

if (!result) {

throw py::exception();

}

Py_DECREF(result);

}

};

int fileobject_to_PythonFileWriter(PyObject *object, void *address)

{

PythonFileWriter *file_writer = (PythonFileWriter *)address;

PyObject *write_method = PyObject_GetAttrString(object, "write");

if (write_method == NULL || !PyCallable_Check(write_method)) {

PyErr_SetString(PyExc_TypeError, "Expected a file-like object with a write method.");

return 0;

}

file_writer->set(write_method);

Py_DECREF(write_method);

return 1;

}

int pyiterable_to_vector_int(PyObject *object, void *address)

{

std::vector<int> *result = (std::vector<int> *)address;

PyObject *iterator = PyObject_GetIter(object);

if (!iterator) {

return 0;

}

PyObject *item;

while ((item = PyIter_Next(iterator))) {

#if PY3K

long value = PyLong_AsLong(item);

#else

long value = PyInt_AsLong(item);

#endif

Py_DECREF(item);

if (value == -1 && PyErr_Occurred()) {

return 0;

}

result->push_back((int)value);

}

Py_DECREF(iterator);

return 1;

}

static PyObject *convert_ttf_to_ps(PyObject *self, PyObject *args, PyObject *kwds)

{

const char *filename;

PythonFileWriter output;

int fonttype;

std::vector<int> glyph_ids;

static const char *kwlist[] = { "filename", "output", "fonttype", "glyph_ids", NULL };

if (!PyArg_ParseTupleAndKeywords(args,

kwds,

#if PY_MAJOR_VERSION == 3

"yO&i|O&:convert_ttf_to_ps",

#else

"sO&i|O&:convert_ttf_to_ps",

#endif

(char **)kwlist,

&filename,

fileobject_to_PythonFileWriter,

&output,

&fonttype,

pyiterable_to_vector_int,

&glyph_ids)) {

return NULL;

}

if (fonttype != 3 && fonttype != 42) {

PyErr_SetString(PyExc_ValueError,

"fonttype must be either 3 (raw Postscript) or 42 "

"(embedded Truetype)");

return NULL;

}

try

{

insert_ttfont(filename, output, (font_type_enum)fonttype, glyph_ids);

}

catch (TTException &e)

{

PyErr_SetString(PyExc_RuntimeError, e.getMessage());

return NULL;

}

catch (const py::exception &)

{

return NULL;

}

catch (...)

{

PyErr_SetString(PyExc_RuntimeError, "Unknown C++ exception");

return NULL;

}

Py_INCREF(Py_None);

return Py_None;

}

class PythonDictionaryCallback : public TTDictionaryCallback

{

PyObject *_dict;

public:

PythonDictionaryCallback(PyObject *dict)

{

_dict = dict;

}

virtual void add_pair(const char *a, const char *b)

{

assert(a != NULL);

assert(b != NULL);

PyObject *value = PyBytes_FromString(b);

if (!value) {

throw py::exception();

}

if (PyDict_SetItemString(_dict, a, value)) {

Py_DECREF(value);

throw py::exception();

}

Py_DECREF(value);

}

};

static PyObject *py_get_pdf_charprocs(PyObject *self, PyObject *args, PyObject *kwds)

{

const char *filename;

std::vector<int> glyph_ids;

PyObject *result;

static const char *kwlist[] = { "filename", "glyph_ids", NULL };

if (!PyArg_ParseTupleAndKeywords(args,

kwds,

#if PY_MAJOR_VERSION == 3

"y|O&:get_pdf_charprocs",

#else

"s|O&:get_pdf_charprocs",

#endif

(char **)kwlist,

&filename,

pyiterable_to_vector_int,

&glyph_ids)) {

return NULL;

}

result = PyDict_New();

if (!result) {

return NULL;

}

PythonDictionaryCallback dict(result);

try

{

::get_pdf_charprocs(filename, glyph_ids, dict);

}

catch (TTException &e)

{

Py_DECREF(result);

PyErr_SetString(PyExc_RuntimeError, e.getMessage());

return NULL;

}

catch (const py::exception &)

{

Py_DECREF(result);

return NULL;

}

catch (...)

{

Py_DECREF(result);

PyErr_SetString(PyExc_RuntimeError, "Unknown C++ exception");

return NULL;

}

return result;

}

static PyMethodDef ttconv_methods[] =

{

"convert_ttf_to_ps", (PyCFunction)convert_ttf_to_ps, METH_VARARGS | METH_KEYWORDS,

"convert_ttf_to_ps(filename, output, fonttype, glyph_ids)\n"

"\n"

"Converts the Truetype font into a Type 3 or Type 42 Postscript font, "

"optionally subsetting the font to only the desired set of characters.\n"

"\n"

"filename is the path to a TTF font file.\n"

"output is a Python file-like object with a write method that the Postscript "

"font data will be written to.\n"

"fonttype may be either 3 or 42. Type 3 is a \"raw Postscript\" font. "

"Type 42 is an embedded Truetype font. Glyph subsetting is not supported "

"for Type 42 fonts.\n"

"glyph_ids (optional) is a list of glyph ids (integers) to keep when "

"subsetting to a Type 3 font. If glyph_ids is not provided or is None, "

"then all glyphs will be included. If any of the glyphs specified are "

"composite glyphs, then the component glyphs will also be included."

{

"get_pdf_charprocs", (PyCFunction)py_get_pdf_charprocs, METH_VARARGS | METH_KEYWORDS,

"get_pdf_charprocs(filename, glyph_ids)\n"

"\n"

"Given a Truetype font file, returns a dictionary containing the PDF Type 3\n"

"representation of its paths. Useful for subsetting a Truetype font inside\n"

"of a PDF file.\n"

"\n"

"filename is the path to a TTF font file.\n"

"glyph_ids is a list of the numeric glyph ids to include.\n"

"The return value is a dictionary where the keys are glyph names and\n"

"the values are the stream content needed to render that glyph. This\n"

"is useful to generate the CharProcs dictionary in a PDF Type 3 font.\n"

{0, 0, 0, 0} /* Sentinel */

};

static const char *module_docstring =

"Module to handle converting and subsetting TrueType "

"fonts to Postscript Type 3, Postscript Type 42 and "

"Pdf Type 3 fonts.";

#if PY3K

static PyModuleDef ttconv_module = {

PyModuleDef_HEAD_INIT,

"ttconv",

module_docstring,

-1,

ttconv_methods,

NULL, NULL, NULL, NULL

};

PyMODINIT_FUNC

PyInit_ttconv(void)

{

PyObject* m;

m = PyModule_Create(&ttconv_module);

return m;

}

#else

PyMODINIT_FUNC

initttconv(void)

{

Py_InitModule3("ttconv", ttconv_methods, module_docstring);

}

#endif

matplotlib/src/_ttconv.cpp at boxplot-stat-transforms · phobson/matplotlib · GitHub

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