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matplotlib/src/_ttconv.cpp at 7fdae0a73c95023386f2ffa40543962fd9aaa95b · Niarfe/matplotlib · GitHub
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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
<
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
()
{
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)
{
#
if
PY3K
result =
PyObject_CallFunction
(_write_method, (
char
*)
"
y
"
, a);
#
else
result =
PyObject_CallFunction
(_write_method, (
char
*)
"
s
"
, a);
#
endif
if
(! result)
{
throw
PythonExceptionOccurred
();
}
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)))
{
#
if
PY3K
long
value =
PyLong_AsLong
(item);
#
else
long
value =
PyInt_AsLong
(item);
#
endif
Py_DECREF
(item);
if
(value == -
1
&&
PyErr_Occurred
())
{
return
0
;
}
result->
push_back
(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,
"
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&)
{
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)
{
const
char
*p;
/*
Each glyph includes bounding box information, but xpdf and
ghostscript can't handle it in a Form XObject (they
segfault!!!), so we remove it from the stream here. It's
not needed anyway, since the Form XObject includes it in
its BBox value.
*/
p = b;
for
(p = b; *p !=
0
; ++p) {
if
(*p ==
'
d
'
) {
if
(*(p +
1
) ==
'
1
'
) {
p +=
2
;
break
;
}
}
}
#
if
PY3K
PyObject* value =
PyBytes_FromString
(p);
#
else
PyObject* value =
PyString_FromString
(p);
#
endif
if
(value)
{
if
(
PyDict_SetItemString
(_dict, a, value))
{
Py_DECREF
(value);
throw
PythonExceptionOccurred
();
}
}
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,
"
s|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
(PythonExceptionOccurred&)
{
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.
"
;
#
if
PY3K
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;
}
#
else
PyMODINIT_FUNC
initttconv
(
void
)
{
PyObject* m;
m =
Py_InitModule3
(
"
ttconv
"
, ttconv_methods, module_docstring);
}
#
endif
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