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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
/*
_ttconv.c
Python wrapper for TrueType conversion library in ../ttconv.
*/
#
include
<
pybind11/pybind11.h
>
#
include
<
pybind11/stl.h
>
#
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<std::vector<
int
>> 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<
int
>{});
try
{
insert_ttfont
(filename, output_,
static_cast
<font_type_enum>(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.
"
);
}
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