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matplotlib/src/_backend_gdk.c at transforms · staticor/matplotlib · GitHub
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_backend_gdk.c
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/* -*- mode: C; c-basic-offset: 4 -*-
* C extensions for backend_gdk
*/
#include
"Python.h"
#define
PY_ARRAY_TYPES_PREFIX
NumPy
#include
"numpy/arrayobject.h"
#include
<pygtk/pygtk.h>
static
PyTypeObject
*
_PyGdkPixbuf_Type
;
#define
PyGdkPixbuf_Type
(*_PyGdkPixbuf_Type)
/* Implement the equivalent to gtk.gdk.Pixbuf.get_pixels_array()
* To solve these problems with the pygtk version:
* 1) It works for Numeric, but not numarray
* 2) Its only available if pygtk is compiled with Numeric support
* Fedora 1,2,3 has PyGTK, but not Numeric and so does not have
* Pixbuf.get_pixels_array().
* Fedora 4 does have PyGTK, Numeric and Pixbuf.get_pixels_array()
*/
static
PyObject
*
pixbuf_get_pixels_array
(
PyObject
*
self
,
PyObject
*
args
)
{
/* 1) read in Python pixbuf, get the underlying gdk_pixbuf */
PyGObject
*
py_pixbuf
;
GdkPixbuf
*
gdk_pixbuf
;
PyArrayObject
*
array
;
int
dims
[
3
]
=
{
0
,
0
,
3
};
if
(!
PyArg_ParseTuple
(
args
,
"O!:pixbuf_get_pixels_array"
,
&
PyGdkPixbuf_Type
,
&
py_pixbuf
))
return
NULL
;
gdk_pixbuf
=
GDK_PIXBUF
(
py_pixbuf
->
obj
);
/* 2) same as pygtk/gtk/gdk.c _wrap_gdk_pixbuf_get_pixels_array()
* with 'self' changed to py_pixbuf
*/
dims
[
0
]
=
gdk_pixbuf_get_height
(
gdk_pixbuf
);
dims
[
1
]
=
gdk_pixbuf_get_width
(
gdk_pixbuf
);
if
(
gdk_pixbuf_get_has_alpha
(
gdk_pixbuf
))
dims
[
2
]
=
4
;
array
=
(
PyArrayObject
*
)
PyArray_FromDimsAndData
(
3
,
dims
,
PyArray_UBYTE
,
(
char
*
)
gdk_pixbuf_get_pixels
(
gdk_pixbuf
));
if
(
array
==
NULL
)
return
NULL
;
array
->
strides
[
0
]
=
gdk_pixbuf_get_rowstride
(
gdk_pixbuf
);
/* the array holds a ref to the pixbuf pixels through this wrapper*/
Py_INCREF
(
py_pixbuf
);
array
->
base
=
(
PyObject
*
)
py_pixbuf
;
return
PyArray_Return
(
array
);
}
static
PyMethodDef
_backend_gdk_functions
[]
=
{
{
"pixbuf_get_pixels_array"
, (
PyCFunction
)
pixbuf_get_pixels_array
,
METH_VARARGS
},
{
NULL
,
NULL
,
0
}
};
DL_EXPORT
(
void
)
init_backend_gdk
(
void
)
{
PyObject
*
mod
;
mod
=
Py_InitModule
(
"matplotlib.backends._backend_gdk"
,
_backend_gdk_functions
);
import_array
();
init_pygtk
();
mod
=
PyImport_ImportModule
(
"gtk.gdk"
);
_PyGdkPixbuf_Type
=
(
PyTypeObject
*
)
PyObject_GetAttrString
(
mod
,
"Pixbuf"
);
}
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