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/* -*- mode: c++; c-basic-offset: 4 -*- */
/*
_ttconv.c
Python wrapper for TrueType conversion library in ../ttconv.
*/
#include
#include
#include "pprdrv.h"
namespace py = pybind11;
using namespace pybind11::literals;
/**
* An implementation of TTStreamWriter that writes to a Python
* file-like object.
*/
class PythonFileWriter : public TTStreamWriter
{
py::function _write_method;
public:
PythonFileWriter(py::object& file_object)
: _write_method(file_object.attr("write")) {}
virtual void write(const char *a)
{
PyObject* decoded = PyUnicode_DecodeLatin1(a, strlen(a), "");
if (decoded == NULL) {
throw py::error_already_set();
}
_write_method(py::handle(decoded));
Py_DECREF(decoded);
}
};
static void convert_ttf_to_ps(
const char *filename,
py::object &output,
int fonttype,
std::optional glyph_ids_or_none)
{
PythonFileWriter output_(output);
if (fonttype != 3 && fonttype != 42) {
throw py::value_error(
"fonttype must be either 3 (raw Postscript) or 42 (embedded Truetype)");
}
auto glyph_ids = glyph_ids_or_none.value_or(std::vector{});
try
{
insert_ttfont(filename, output_, static_cast(fonttype), glyph_ids);
}
catch (TTException &e)
{
throw std::runtime_error(e.getMessage());
}
catch (...)
{
throw std::runtime_error("Unknown C++ exception");
}
}
PYBIND11_MODULE(_ttconv, m) {
m.doc() = "Module to handle converting and subsetting TrueType "
"fonts to Postscript Type 3, Postscript Type 42 and "
"Pdf Type 3 fonts.";
m.def("convert_ttf_to_ps", &convert_ttf_to_ps,
"filename"_a,
"output"_a,
"fonttype"_a,
"glyph_ids"_a = py::none(),
"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 within this module (needs to be done externally).\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."
);
}