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_ttconv.cpp
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/*
_ttconv.c
Python wrapper for TrueType conversion library in ../ttconv.
*/
#include <Python.h>
#include "ttconv/pprdrv.h"
#include <vector>
class PythonExceptionOccurred {
};
/**
* 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() {
if (_write_method)
Py_DECREF(_write_method);
}
void set(PyObject* write_method) {
if (_write_method)
Py_DECREF(_write_method);
_write_method = write_method;
if (_write_method)
Py_INCREF(_write_method);
}
virtual void write(const char* a) {
if (_write_method)
if (! PyObject_CallFunction(_write_method, (char *)"s", a))
throw PythonExceptionOccurred();
}
};
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);
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)) ) {
long value = PyInt_AsLong(item);
if (value == -1 && PyErr_Occurred())
return 0;
result->push_back(value);
}
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,
"sO&i|O&:convert_ttf_to_ps",
(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 (PythonExceptionOccurred& e) {
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) {
PyObject* value = PyString_FromString(b);
if (value)
if (PyDict_SetItemString(_dict, a, value))
throw PythonExceptionOccurred();
}
};
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,
"s|O&:convert_ttf_to_ps",
(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) {
PyErr_SetString(PyExc_RuntimeError, e.getMessage());
return NULL;
} catch (PythonExceptionOccurred& e) {
return NULL;
} catch (...) {
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_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_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"
},
{NULL} /* Sentinel */
};
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
PyMODINIT_FUNC
initttconv(void)
{
PyObject* m;
m = Py_InitModule3("ttconv", ttconv_methods,
"Module to handle converting and subsetting TrueType "
"fonts to Postscript Type 3, Postscript Type 42 and "
"Pdf Type 3 fonts.");
}