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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.
"
);
}
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