forked from matplotlib/matplotlib
-
Notifications
You must be signed in to change notification settings - Fork 1
/
_tkagg.cpp
335 lines (299 loc) · 9.92 KB
/
_tkagg.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
/* -*- 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>
#include <cstdlib>
#include <cstdio>
#include <sstream>
#include <agg_basics.h> // agg:int8u
#ifdef _WIN32
#include <windows.h>
#endif
// 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
# define IMG_FORMAT "%d %d %zu"
#endif
#define BBOX_FORMAT "%f %f %f %f"
typedef struct
{
PyObject_HEAD
Tcl_Interp *interp;
} TkappObject;
// Global vars for Tcl / Tk functions. We load these symbols from the tkinter
// extension module or loaded Tcl / Tk libraries at run-time.
static Tcl_CreateCommand_t TCL_CREATE_COMMAND;
static Tcl_AppendResult_t TCL_APPEND_RESULT;
static Tk_MainWindow_t TK_MAIN_WINDOW;
static Tk_FindPhoto_t TK_FIND_PHOTO;
static Tk_PhotoPutBlock_NoComposite_t TK_PHOTO_PUT_BLOCK_NO_COMPOSITE;
static Tk_PhotoBlank_t TK_PHOTO_BLANK;
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[] = {
/* Tkinter interface stuff */
{ "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 TCL / Tk function pointers by dynamic loading
#ifdef _WIN32
/*
* On Windows, we can't load the tkinter module to get the TCL or 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 TCL and Tk
* function names.
*/
#define PSAPI_VERSION 1
#include <psapi.h>
// Must be linked with 'psapi' library
FARPROC _dfunc(HMODULE lib_handle, const char *func_name)
{
// Load function `func_name` from `lib_handle`.
// Set Python exception if we can't find `func_name` in `lib_handle`.
// Returns function pointer or NULL if not present.
char message[100];
FARPROC func = GetProcAddress(lib_handle, func_name);
if (func == NULL) {
sprintf(message, "Cannot load function %s", func_name);
PyErr_SetString(PyExc_RuntimeError, message);
}
return func;
}
int get_tcl(HMODULE hMod)
{
// Try to fill TCL global vars with function pointers. Return 0 for no
// functions found, 1 for all functions found, -1 for some but not all
// functions found.
TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
GetProcAddress(hMod, "Tcl_CreateCommand");
if (TCL_CREATE_COMMAND == NULL) { // Maybe not TCL module
return 0;
}
TCL_APPEND_RESULT = (Tcl_AppendResult_t) _dfunc(hMod, "Tcl_AppendResult");
return (TCL_APPEND_RESULT == NULL) ? -1 : 1;
}
int get_tk(HMODULE hMod)
{
// Try to fill Tk global vars with function pointers. Return 0 for no
// functions found, 1 for all functions found, -1 for some but not all
// functions found.
TK_MAIN_WINDOW = (Tk_MainWindow_t)
GetProcAddress(hMod, "Tk_MainWindow");
if (TK_MAIN_WINDOW == NULL) { // Maybe not Tk module
return 0;
}
return // -1 if any remaining symbols are NULL
((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(hMod, "Tk_FindPhoto")) == NULL) ||
((TK_PHOTO_PUT_BLOCK_NO_COMPOSITE = (Tk_PhotoPutBlock_NoComposite_t)
_dfunc(hMod, "Tk_PhotoPutBlock_NoComposite")) == NULL) ||
((TK_PHOTO_BLANK = (Tk_PhotoBlank_t)
_dfunc(hMod, "Tk_PhotoBlank")) == NULL)
? -1 : 1;
}
void load_tkinter_funcs(void)
{
// Load TCL and Tk functions by searching all modules in current process.
// Sets an error on failure.
HMODULE hMods[1024];
HANDLE hProcess;
DWORD cbNeeded;
unsigned int i;
int found_tcl = 0;
int found_tk = 0;
// Returns pseudo-handle that does not need to be closed
hProcess = GetCurrentProcess();
// Iterate through modules in this process looking for TCL / Tk names
if (EnumProcessModules(hProcess, hMods, sizeof(hMods), &cbNeeded)) {
for (i = 0; i < (cbNeeded / sizeof(HMODULE)); i++) {
if (!found_tcl) {
found_tcl = get_tcl(hMods[i]);
if (found_tcl == -1) {
return;
}
}
if (!found_tk) {
found_tk = get_tk(hMods[i]);
if (found_tk == -1) {
return;
}
}
if (found_tcl && found_tk) {
return;
}
}
}
if (found_tcl == 0) {
PyErr_SetString(PyExc_RuntimeError, "Could not find TCL routines");
} else {
PyErr_SetString(PyExc_RuntimeError, "Could not find Tk routines");
}
return;
}
#else // not Windows
/*
* On Unix, we can get the TCL and Tk symbols from the tkinter module, because
* tkinter uses these symbols, and the symbols are therefore visible in the
* tkinter dynamic library (module).
*/
#include <dlfcn.h>
void *_dfunc(void *lib_handle, const char *func_name)
{
// Load function `func_name` from `lib_handle`.
// Set Python exception if we can't find `func_name` in `lib_handle`.
// Returns function pointer or NULL if not present.
void* func;
// Reset errors.
dlerror();
func = dlsym(lib_handle, func_name);
if (func == NULL) {
PyErr_SetString(PyExc_RuntimeError, dlerror());
}
return func;
}
int _func_loader(void *lib)
{
// Fill global function pointers from dynamic lib.
// Return 1 if any pointer is NULL, 0 otherwise.
return
((TCL_CREATE_COMMAND = (Tcl_CreateCommand_t)
_dfunc(lib, "Tcl_CreateCommand")) == NULL) ||
((TCL_APPEND_RESULT = (Tcl_AppendResult_t)
_dfunc(lib, "Tcl_AppendResult")) == NULL) ||
((TK_MAIN_WINDOW = (Tk_MainWindow_t)
_dfunc(lib, "Tk_MainWindow")) == NULL) ||
((TK_FIND_PHOTO = (Tk_FindPhoto_t)
_dfunc(lib, "Tk_FindPhoto")) == NULL) ||
((TK_PHOTO_PUT_BLOCK_NO_COMPOSITE = (Tk_PhotoPutBlock_NoComposite_t)
_dfunc(lib, "Tk_PhotoPutBlock_NoComposite")) == NULL) ||
((TK_PHOTO_BLANK = (Tk_PhotoBlank_t)
_dfunc(lib, "Tk_PhotoBlank")) == NULL);
}
void load_tkinter_funcs(void)
{
// Load tkinter global funcs from tkinter compiled module.
// Sets an error on failure.
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 (_func_loader(main_program) == 0) {
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;
}
_func_loader(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();
return PyErr_Occurred() ? NULL : PyModule_Create(&_tkagg_module);
}