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/* -*- mode: c++; c-basic-offset: 4 -*- */
// Where is PIL?
//
// Many years ago, Matplotlib used to include code from PIL (the Python Imaging
// Library). Since then, the code has changed a lot - the organizing principle
// and methods of operation are now quite different. Because our review of
// the codebase showed that all the code that came from PIL was removed or
// rewritten, we have removed the PIL licensing information. If you want PIL,
// you can get it at https://python-pillow.org/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#ifdef _WIN32
#define WIN32_DLL
#endif
#ifdef __CYGWIN__
/*
* Unfortunately cygwin's libdl inherits restrictions from the underlying
* Windows OS, at least currently. Therefore, a symbol may be loaded from a
* module by dlsym() only if it is really located in the given module,
* dependencies are not included. So we have to use native WinAPI on Cygwin
* also.
*/
#define WIN32_DLL
static inline PyObject *PyErr_SetFromWindowsErr(int ierr) {
PyErr_SetString(PyExc_OSError, "Call to EnumProcessModules failed");
return NULL;
}
#endif
#ifdef WIN32_DLL
#include <string>
#include <windows.h>
#include <commctrl.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"
static int convert_voidptr(PyObject *obj, void *p)
{
void **val = (void **)p;
*val = PyLong_AsVoidPtr(obj);
return *val != NULL ? 1 : !PyErr_Occurred();
}
// 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_t TK_PHOTO_PUT_BLOCK;
// Global vars for Tcl functions. We load these symbols from the tkinter
// extension module or loaded Tcl libraries at run-time.
static Tcl_SetVar_t TCL_SETVAR;
static PyObject *mpl_tk_blit(PyObject *self, PyObject *args)
{
Tcl_Interp *interp;
char const *photo_name;
int height, width;
unsigned char *data_ptr;
int comp_rule;
int put_retval;
int o0, o1, o2, o3;
int x1, x2, y1, y2;
Tk_PhotoHandle photo;
Tk_PhotoImageBlock block;
if (!PyArg_ParseTuple(args, "O&s(iiO&)i(iiii)(iiii):blit",
convert_voidptr, &interp, &photo_name,
&height, &width, convert_voidptr, &data_ptr,
&comp_rule,
&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;
}
if (comp_rule != TK_PHOTO_COMPOSITE_OVERLAY && comp_rule != TK_PHOTO_COMPOSITE_SET) {
PyErr_SetString(PyExc_ValueError, "Invalid comp_rule argument");
goto exit;
}
Py_BEGIN_ALLOW_THREADS
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;
put_retval = TK_PHOTO_PUT_BLOCK(
interp, photo, &block, x1, height - y2, x2 - x1, y2 - y1, comp_rule);
Py_END_ALLOW_THREADS
if (put_retval == TCL_ERROR) {
return PyErr_NoMemory();
}
exit:
if (PyErr_Occurred()) {
return NULL;
} else {
Py_RETURN_NONE;
}
}
#ifdef WIN32_DLL
LRESULT CALLBACK
DpiSubclassProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam,
UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
{
switch (uMsg) {
case WM_DPICHANGED:
// This function is a subclassed window procedure, and so is run during
// the Tcl/Tk event loop. Unfortunately, Tkinter has a *second* lock on
// Tcl threading that is not exposed publicly, but is currently taken
// while we're in the window procedure. So while we can take the GIL to
// call Python code, we must not also call *any* Tk code from Python.
// So stay with Tcl calls in C only.
{
// This variable naming must match the name used in
// lib/matplotlib/backends/_backend_tk.py:FigureManagerTk.
std::string var_name("window_dpi");
var_name += std::to_string((unsigned long long)hwnd);
// X is high word, Y is low word, but they are always equal.
std::string dpi = std::to_string(LOWORD(wParam));
Tcl_Interp* interp = (Tcl_Interp*)dwRefData;
TCL_SETVAR(interp, var_name.c_str(), dpi.c_str(), 0);
}
return 0;
case WM_NCDESTROY:
RemoveWindowSubclass(hwnd, DpiSubclassProc, uIdSubclass);
break;
}
return DefSubclassProc(hwnd, uMsg, wParam, lParam);
}
#endif
static PyObject*
mpl_tk_enable_dpi_awareness(PyObject* self, PyObject*const* args,
Py_ssize_t nargs)
{
if (nargs != 2) {
return PyErr_Format(PyExc_TypeError,
"enable_dpi_awareness() takes 2 positional "
"arguments but %zd were given",
nargs);
}
#ifdef WIN32_DLL
HWND frame_handle = NULL;
Tcl_Interp *interp = NULL;
if (!convert_voidptr(args[0], &frame_handle)) {
return NULL;
}
if (!convert_voidptr(args[1], &interp)) {
return NULL;
}
#ifdef _DPI_AWARENESS_CONTEXTS_
HMODULE user32 = LoadLibrary("user32.dll");
typedef DPI_AWARENESS_CONTEXT (WINAPI *GetWindowDpiAwarenessContext_t)(HWND);
GetWindowDpiAwarenessContext_t GetWindowDpiAwarenessContextPtr =
(GetWindowDpiAwarenessContext_t)GetProcAddress(
user32, "GetWindowDpiAwarenessContext");
if (GetWindowDpiAwarenessContextPtr == NULL) {
FreeLibrary(user32);
Py_RETURN_FALSE;
}
typedef BOOL (WINAPI *AreDpiAwarenessContextsEqual_t)(DPI_AWARENESS_CONTEXT,
DPI_AWARENESS_CONTEXT);
AreDpiAwarenessContextsEqual_t AreDpiAwarenessContextsEqualPtr =
(AreDpiAwarenessContextsEqual_t)GetProcAddress(
user32, "AreDpiAwarenessContextsEqual");
if (AreDpiAwarenessContextsEqualPtr == NULL) {
FreeLibrary(user32);
Py_RETURN_FALSE;
}
DPI_AWARENESS_CONTEXT ctx = GetWindowDpiAwarenessContextPtr(frame_handle);
bool per_monitor = (
AreDpiAwarenessContextsEqualPtr(
ctx, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) ||
AreDpiAwarenessContextsEqualPtr(
ctx, DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE));
if (per_monitor) {
// Per monitor aware means we need to handle WM_DPICHANGED by wrapping
// the Window Procedure, and the Python side needs to trace the Tk
// window_dpi variable stored on interp.
SetWindowSubclass(frame_handle, DpiSubclassProc, 0, (DWORD_PTR)interp);
}
FreeLibrary(user32);
return PyBool_FromLong(per_monitor);
#endif
#endif
Py_RETURN_NONE;
}
static PyMethodDef functions[] = {
{ "blit", (PyCFunction)mpl_tk_blit, METH_VARARGS },
{ "enable_dpi_awareness", (PyCFunction)mpl_tk_enable_dpi_awareness,
METH_FASTCALL },
{ NULL, NULL } /* sentinel */
};
// Functions to fill global Tcl/Tk function pointers by dynamic loading.
template <class T>
bool load_tcl_tk(T lib)
{
// Try to fill Tcl/Tk global vars with function pointers. Return whether
// all of them have been filled.
if (auto ptr = dlsym(lib, "Tcl_SetVar")) {
TCL_SETVAR = (Tcl_SetVar_t)ptr;
}
if (auto ptr = dlsym(lib, "Tk_FindPhoto")) {
TK_FIND_PHOTO = (Tk_FindPhoto_t)ptr;
}
if (auto ptr = dlsym(lib, "Tk_PhotoPutBlock")) {
TK_PHOTO_PUT_BLOCK = (Tk_PhotoPutBlock_t)ptr;
}
return TCL_SETVAR && TK_FIND_PHOTO && TK_PHOTO_PUT_BLOCK;
}
#ifdef WIN32_DLL
/* On Windows, we can't load the tkinter module to get the Tcl/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/Tk function
* names.
*/
void load_tkinter_funcs(void)
{
HANDLE process = GetCurrentProcess(); // Pseudo-handle, doesn't need closing.
HMODULE* modules = NULL;
DWORD size;
if (!EnumProcessModules(process, NULL, 0, &size)) {
PyErr_SetFromWindowsErr(0);
goto exit;
}
if (!(modules = static_cast<HMODULE*>(malloc(size)))) {
PyErr_NoMemory();
goto exit;
}
if (!EnumProcessModules(process, modules, size, &size)) {
PyErr_SetFromWindowsErr(0);
goto exit;
}
for (unsigned i = 0; i < size / sizeof(HMODULE); ++i) {
if (load_tcl_tk(modules[i])) {
return;
}
}
exit:
free(modules);
}
#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 = NULL, *tkinter_lib = NULL;
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_tcl_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;
}
if (load_tcl_tk(tkinter_lib)) {
goto exit;
}
exit:
// We don't need to keep a reference open as the main program & tkinter
// have been imported. Use a non-short-circuiting "or" to try closing both
// handles before handling errors.
if ((main_program && dlclose(main_program))
| (tkinter_lib && dlclose(tkinter_lib))) {
PyErr_SetString(PyExc_RuntimeError, dlerror());
}
Py_XDECREF(module);
Py_XDECREF(py_path);
Py_XDECREF(py_path_b);
}
#endif // end not Windows
static PyModuleDef _tkagg_module = {
PyModuleDef_HEAD_INIT, "_tkagg", NULL, -1, functions
};
#pragma GCC visibility push(default)
PyMODINIT_FUNC PyInit__tkagg(void)
{
load_tkinter_funcs();
PyObject *type, *value, *traceback;
PyErr_Fetch(&type, &value, &traceback);
// Always raise ImportError (normalizing a previously set exception if
// needed) to interact properly with backend auto-fallback.
if (value) {
PyErr_NormalizeException(&type, &value, &traceback);
PyErr_SetObject(PyExc_ImportError, value);
return NULL;
} else if (!TCL_SETVAR) {
PyErr_SetString(PyExc_ImportError, "Failed to load Tcl_SetVar");
return NULL;
} else if (!TK_FIND_PHOTO) {
PyErr_SetString(PyExc_ImportError, "Failed to load Tk_FindPhoto");
return NULL;
} else if (!TK_PHOTO_PUT_BLOCK) {
PyErr_SetString(PyExc_ImportError, "Failed to load Tk_PhotoPutBlock");
return NULL;
}
return PyModule_Create(&_tkagg_module);
}
#pragma GCC visibility pop
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