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matplotlib/src/_tkagg.cpp at master · datafiend/matplotlib · GitHub
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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
/*
* This code is derived from The Python Imaging Library and is covered
* by the PIL license.
*
* See LICENSE/LICENSE.PIL for details.
*
*/
#
define
PY_SSIZE_T_CLEAN
#
include
<
Python.h
>
#
ifdef
_WIN32
#
include
<
windows.h
>
#
define
PSAPI_VERSION
1
#
include
<
psapi.h
>
//
Must be linked with 'psapi' library
#
define
dlsym
GetProcAddress
#
else
#
include
<
dlfcn.h
>
#
endif
//
Include our own excerpts from the Tcl / Tk headers
#
include
"
_tkmini.h
"
#
include
"
py_converters.h
"
//
Global vars for Tk functions. We load these symbols from the tkinter
//
extension module or loaded Tk libraries at run-time.
static
Tk_FindPhoto_t
TK_FIND_PHOTO
;
static
Tk_PhotoPutBlock_NoComposite_t
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE
;
static
PyObject *
mpl_tk_blit
(PyObject *self, PyObject *args)
{
Tcl_Interp *interp;
char
const
*photo_name;
int
height, width;
unsigned
char
*data_ptr;
int
o0, o1, o2, o3;
int
x1, x2, y1, y2;
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
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;
}
if
(!(photo =
TK_FIND_PHOTO
(interp, photo_name))) {
PyErr_SetString
(PyExc_ValueError,
"
Failed to extract Tk_PhotoHandle
"
);
goto
exit;
}
if
(
0
> y1 || y1 > y2 || y2 > height ||
0
> x1 || x1 > x2 || x2 > width) {
PyErr_SetString
(PyExc_ValueError,
"
Attempting to draw out of bounds
"
);
goto
exit;
}
block.
pixelPtr
= data_ptr +
4
* ((height - y2) * width + x1);
block.
width
= x2 - x1;
block.
height
= y2 - y1;
block.
pitch
=
4
* width;
block.
pixelSize
=
4
;
block.
offset
[
0
] = o0;
block.
offset
[
1
] = o1;
block.
offset
[
2
] = o2;
block.
offset
[
3
] = o3;
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE
(
photo, &block, x1, height - y2, x2 - x1, y2 - y1);
exit:
if
(
PyErr_Occurred
()) {
return
NULL
;
}
else
{
Py_RETURN_NONE;
}
}
#
ifdef
_WIN32
static
PyObject *
Win32_GetForegroundWindow
(PyObject *
module
, PyObject *args)
{
HWND
handle =
GetForegroundWindow
();
if
(!
PyArg_ParseTuple
(args,
"
:GetForegroundWindow
"
)) {
return
NULL
;
}
return
PyLong_FromSize_t
((
size_t
)handle);
}
static
PyObject *
Win32_SetForegroundWindow
(PyObject *
module
, PyObject *args)
{
HWND
handle;
if
(!
PyArg_ParseTuple
(args,
"
n:SetForegroundWindow
"
, &handle)) {
return
NULL
;
}
if
(!
SetForegroundWindow
(handle)) {
return
PyErr_Format
(PyExc_RuntimeError,
"
Error setting window
"
);
}
Py_INCREF
(Py_None);
return
Py_None;
}
#
endif
static
PyMethodDef functions[] = {
{
"
blit
"
, (PyCFunction)mpl_tk_blit,
METH_VARARGS
},
#
ifdef
_WIN32
{
"
Win32_GetForegroundWindow
"
, (PyCFunction)Win32_GetForegroundWindow,
METH_VARARGS
},
{
"
Win32_SetForegroundWindow
"
, (PyCFunction)Win32_SetForegroundWindow,
METH_VARARGS
},
#
endif
{
NULL
,
NULL
}
/*
sentinel
*/
};
//
Functions to fill global Tk function pointers by dynamic loading
template
<
class
T
>
int
load_tk
(T lib)
{
//
Try to fill Tk global vars with function pointers. Return the number of
//
functions found.
return
!!(
TK_FIND_PHOTO
=
(Tk_FindPhoto_t)
dlsym
(lib,
"
Tk_FindPhoto
"
)) +
!!(
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE
=
(Tk_PhotoPutBlock_NoComposite_t)
dlsym
(lib,
"
Tk_PhotoPutBlock_NoComposite
"
));
}
#
ifdef
_WIN32
/*
* On Windows, we can't load the tkinter module to get the Tk symbols, because
* Windows does not load symbols into the library name-space of importing
* modules. So, knowing that tkinter has already been imported by Python, we
* scan all modules in the running process for the Tk function names.
*/
void
load_tkinter_funcs
(
void
)
{
//
Load Tk functions by searching all modules in current process.
HMODULE
hMods[
1024
];
HANDLE
hProcess;
DWORD
cbNeeded;
unsigned
int
i;
//
Returns pseudo-handle that does not need to be closed
hProcess =
GetCurrentProcess
();
//
Iterate through modules in this process looking for Tk names.
if
(
EnumProcessModules
(hProcess, hMods,
sizeof
(hMods), &cbNeeded)) {
for
(i =
0
; i < (cbNeeded /
sizeof
(
HMODULE
)); i++) {
if
(
load_tk
(hMods[i])) {
return
;
}
}
}
}
#
else
//
not Windows
/*
* On Unix, we can get the Tk symbols from the tkinter module, because tkinter
* uses these symbols, and the symbols are therefore visible in the tkinter
* dynamic library (module).
*/
void
load_tkinter_funcs
(
void
)
{
//
Load tkinter global funcs from tkinter compiled module.
void
*main_program, *tkinter_lib;
PyObject *
module
=
NULL
, *py_path =
NULL
, *py_path_b =
NULL
;
char
*path;
//
Try loading from the main program namespace first.
main_program =
dlopen
(
NULL
,
RTLD_LAZY
);
if
(
load_tk
(main_program)) {
goto
exit;
}
//
Clear exception triggered when we didn't find symbols above.
PyErr_Clear
();
//
Handle PyPy first, as that import will correctly fail on CPython.
module
=
PyImport_ImportModule
(
"
_tkinter.tklib_cffi
"
);
//
PyPy
if
(!
module
) {
PyErr_Clear
();
module
=
PyImport_ImportModule
(
"
_tkinter
"
);
//
CPython
}
if
(!(
module
&&
(py_path =
PyObject_GetAttrString
(
module
,
"
__file__
"
)) &&
(py_path_b =
PyUnicode_EncodeFSDefault
(py_path)) &&
(path =
PyBytes_AsString
(py_path_b)))) {
goto
exit;
}
tkinter_lib =
dlopen
(path,
RTLD_LAZY
);
if
(!tkinter_lib) {
PyErr_SetString
(PyExc_RuntimeError,
dlerror
());
goto
exit;
}
load_tk
(tkinter_lib);
//
dlclose is safe because tkinter has been imported.
dlclose
(tkinter_lib);
goto
exit;
exit:
Py_XDECREF
(
module
);
Py_XDECREF
(py_path);
Py_XDECREF
(py_path_b);
}
#
endif
//
end not Windows
static
PyModuleDef _tkagg_module = {
PyModuleDef_HEAD_INIT,
"
_tkagg
"
,
"
"
, -
1
, functions,
NULL
,
NULL
,
NULL
,
NULL
};
PyMODINIT_FUNC
PyInit__tkagg
(
void
)
{
load_tkinter_funcs
();
if
(
PyErr_Occurred
()) {
return
NULL
;
}
else
if
(!
TK_FIND_PHOTO
) {
PyErr_SetString
(PyExc_RuntimeError,
"
Failed to load Tk_FindPhoto
"
);
return
NULL
;
}
else
if
(!
TK_PHOTO_PUT_BLOCK_NO_COMPOSITE
) {
PyErr_SetString
(PyExc_RuntimeError,
"
Failed to load Tk_PhotoPutBlock_NoComposite
"
);
return
NULL
;
}
return
PyModule_Create
(&_tkagg_module);
}
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