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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))) {
long
value =
PyLong_AsLong
(item);
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,
"
yO&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
(
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,
"
y|O&:get_pdf_charprocs
"
,
(
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.
"
;
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;
}
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