matplotlib · dstansby · Oct 25, 2018 · Oct 22, 2018
diff --git a/setupext.py b/setupext.py
@@ -1363,11 +1363,13 @@ def check(self):

    def get_extension(self):
        sources = [
-            'src/_tkagg.cpp'
+            'src/_tkagg.cpp',
+            'src/py_converters.cpp',
            ]

        ext = make_extension('matplotlib.backends._tkagg', sources)
        self.add_flags(ext)
+        Numpy().add_flags(ext)
        LibAgg().add_flags(ext, add_sources=False)
        return ext


diff --git a/src/_tkagg.cpp b/src/_tkagg.cpp
@@ -18,6 +18,8 @@
 // Include our own excerpts from the Tcl / Tk headers
 #include "_tkmini.h"

+#include "py_converters.h"
+
 #if defined(_MSC_VER)
 #  define IMG_FORMAT "%d %d %Iu"
 #else
@@ -213,9 +215,9 @@ static PyObject *mpl_tk_blit(PyObject *self, PyObject *args)
    int x1, x2, y1, y2;
    Tk_PhotoHandle photo;
    Tk_PhotoImageBlock block;
-    if (!PyArg_ParseTuple(args, "ns(iin)(iiii)(iiii):blit",
-                          &interp, &photo_name,
-                          &height, &width, &data_ptr,
+    if (!PyArg_ParseTuple(args, "O&s(iiO&)(iiii)(iiii):blit",
+                          convert_voidptr, &interp, &photo_name,
+                          &height, &width, convert_voidptr, &data_ptr,
                          &o0, &o1, &o2, &o3,
                          &x1, &x2, &y1, &y2)) {
        goto exit;

diff --git a/src/py_converters.cpp b/src/py_converters.cpp
@@ -94,6 +94,13 @@ int convert_from_attr(PyObject *obj, const char *name, converter func, void *p)
    return 1;
 }

+int convert_voidptr(PyObject *obj, void *p)
+{
+    void **val = (void **)p;
+    *val = PyLong_AsVoidPtr(obj);
+    return *val != NULL ? 1 : !PyErr_Occurred();
+}
+
 int convert_double(PyObject *obj, void *p)
 {
    double *val = (double *)p;

diff --git a/src/py_converters.h b/src/py_converters.h
@@ -23,6 +23,7 @@ typedef int (*converter)(PyObject *, void *);
 int convert_from_attr(PyObject *obj, const char *name, converter func, void *p);
 int convert_from_method(PyObject *obj, const char *name, converter func, void *p);

+int convert_voidptr(PyObject *obj, void *p);
 int convert_double(PyObject *obj, void *p);
 int convert_bool(PyObject *obj, void *p);
 int convert_cap(PyObject *capobj, void *capp);