1 files changed, 211 insertions, 0 deletions
diff --git a/contrib/python/matplotlib/py3/src/_c_internal_utils.c b/contrib/python/matplotlib/py3/src/_c_internal_utils.c
new file mode 100644
index 0000000000..f1bd22a42c
--- /dev/null
+++ b/contrib/python/matplotlib/py3/src/_c_internal_utils.c
@@ -0,0 +1,211 @@
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#ifdef __linux__
+#include <dlfcn.h>
+#endif
+#ifdef _WIN32
+#include <Objbase.h>
+#include <Shobjidl.h>
+#include <Windows.h>
+#endif
+
+static PyObject*
+mpl_display_is_valid(PyObject* module)
+{
+#ifdef __linux__
+    void* libX11;
+    // The getenv check is redundant but helps performance as it is much faster
+    // than dlopen().
+    if (getenv("DISPLAY")
+        && (libX11 = dlopen("libX11.so.6", RTLD_LAZY))) {
+        struct Display* display = NULL;
+        struct Display* (* XOpenDisplay)(char const*) =
+            dlsym(libX11, "XOpenDisplay");
+        int (* XCloseDisplay)(struct Display*) =
+            dlsym(libX11, "XCloseDisplay");
+        if (XOpenDisplay && XCloseDisplay
+                && (display = XOpenDisplay(NULL))) {
+            XCloseDisplay(display);
+        }
+        if (dlclose(libX11)) {
+            PyErr_SetString(PyExc_RuntimeError, dlerror());
+            return NULL;
+        }
+        if (display) {
+            Py_RETURN_TRUE;
+        }
+    }
+    void* libwayland_client;
+    if (getenv("WAYLAND_DISPLAY")
+        && (libwayland_client = dlopen("libwayland-client.so.0", RTLD_LAZY))) {
+        struct wl_display* display = NULL;
+        struct wl_display* (* wl_display_connect)(char const*) =
+            dlsym(libwayland_client, "wl_display_connect");
+        void (* wl_display_disconnect)(struct wl_display*) =
+            dlsym(libwayland_client, "wl_display_disconnect");
+        if (wl_display_connect && wl_display_disconnect
+                && (display = wl_display_connect(NULL))) {
+            wl_display_disconnect(display);
+        }
+        if (dlclose(libwayland_client)) {
+            PyErr_SetString(PyExc_RuntimeError, dlerror());
+            return NULL;
+        }
+        if (display) {
+            Py_RETURN_TRUE;
+        }
+    }
+    Py_RETURN_FALSE;
+#else
+    Py_RETURN_TRUE;
+#endif
+}
+
+static PyObject*
+mpl_GetCurrentProcessExplicitAppUserModelID(PyObject* module)
+{
+#ifdef _WIN32
+    wchar_t* appid = NULL;
+    HRESULT hr = GetCurrentProcessExplicitAppUserModelID(&appid);
+    if (FAILED(hr)) {
+        return PyErr_SetFromWindowsErr(hr);
+    }
+    PyObject* py_appid = PyUnicode_FromWideChar(appid, -1);
+    CoTaskMemFree(appid);
+    return py_appid;
+#else
+    Py_RETURN_NONE;
+#endif
+}
+
+static PyObject*
+mpl_SetCurrentProcessExplicitAppUserModelID(PyObject* module, PyObject* arg)
+{
+#ifdef _WIN32
+    wchar_t* appid = PyUnicode_AsWideCharString(arg, NULL);
+    if (!appid) {
+        return NULL;
+    }
+    HRESULT hr = SetCurrentProcessExplicitAppUserModelID(appid);
+    PyMem_Free(appid);
+    if (FAILED(hr)) {
+        return PyErr_SetFromWindowsErr(hr);
+    }
+    Py_RETURN_NONE;
+#else
+    Py_RETURN_NONE;
+#endif
+}
+
+static PyObject*
+mpl_GetForegroundWindow(PyObject* module)
+{
+#ifdef _WIN32
+  return PyLong_FromVoidPtr(GetForegroundWindow());
+#else
+  Py_RETURN_NONE;
+#endif
+}
+
+static PyObject*
+mpl_SetForegroundWindow(PyObject* module, PyObject *arg)
+{
+#ifdef _WIN32
+  HWND handle = PyLong_AsVoidPtr(arg);
+  if (PyErr_Occurred()) {
+    return NULL;
+  }
+  if (!SetForegroundWindow(handle)) {
+    return PyErr_Format(PyExc_RuntimeError, "Error setting window");
+  }
+  Py_RETURN_NONE;
+#else
+  Py_RETURN_NONE;
+#endif
+}
+
+static PyObject*
+mpl_SetProcessDpiAwareness_max(PyObject* module)
+{
+#ifdef _WIN32
+#ifdef _DPI_AWARENESS_CONTEXTS_
+    // These functions and options were added in later Windows 10 updates, so
+    // must be loaded dynamically.
+    typedef BOOL (WINAPI *IsValidDpiAwarenessContext_t)(DPI_AWARENESS_CONTEXT);
+    typedef BOOL (WINAPI *SetProcessDpiAwarenessContext_t)(DPI_AWARENESS_CONTEXT);
+
+    HMODULE user32 = LoadLibrary("user32.dll");
+    IsValidDpiAwarenessContext_t IsValidDpiAwarenessContextPtr =
+        (IsValidDpiAwarenessContext_t)GetProcAddress(
+            user32, "IsValidDpiAwarenessContext");
+    SetProcessDpiAwarenessContext_t SetProcessDpiAwarenessContextPtr =
+        (SetProcessDpiAwarenessContext_t)GetProcAddress(
+            user32, "SetProcessDpiAwarenessContext");
+    DPI_AWARENESS_CONTEXT ctxs[3] = {
+        DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2,  // Win10 Creators Update
+        DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE,     // Win10
+        DPI_AWARENESS_CONTEXT_SYSTEM_AWARE};         // Win10
+    if (IsValidDpiAwarenessContextPtr != NULL
+            && SetProcessDpiAwarenessContextPtr != NULL) {
+        for (int i = 0; i < sizeof(ctxs) / sizeof(DPI_AWARENESS_CONTEXT); ++i) {
+            if (IsValidDpiAwarenessContextPtr(ctxs[i])) {
+                SetProcessDpiAwarenessContextPtr(ctxs[i]);
+                break;
+            }
+        }
+    } else {
+        // Added in Windows Vista.
+        SetProcessDPIAware();
+    }
+    FreeLibrary(user32);
+#else
+    // Added in Windows Vista.
+    SetProcessDPIAware();
+#endif
+#endif
+    Py_RETURN_NONE;
+}
+
+static PyMethodDef functions[] = {
+    {"display_is_valid", (PyCFunction)mpl_display_is_valid, METH_NOARGS,
+     "display_is_valid()\n--\n\n"
+     "Check whether the current X11 or Wayland display is valid.\n\n"
+     "On Linux, returns True if either $DISPLAY is set and XOpenDisplay(NULL)\n"
+     "succeeds, or $WAYLAND_DISPLAY is set and wl_display_connect(NULL)\n"
+     "succeeds.\n\n"
+     "On other platforms, always returns True."},
+    {"Win32_GetCurrentProcessExplicitAppUserModelID",
+     (PyCFunction)mpl_GetCurrentProcessExplicitAppUserModelID, METH_NOARGS,
+     "Win32_GetCurrentProcessExplicitAppUserModelID()\n--\n\n"
+     "Wrapper for Windows's GetCurrentProcessExplicitAppUserModelID.\n\n"
+     "On non-Windows platforms, always returns None."},
+    {"Win32_SetCurrentProcessExplicitAppUserModelID",
+     (PyCFunction)mpl_SetCurrentProcessExplicitAppUserModelID, METH_O,
+     "Win32_SetCurrentProcessExplicitAppUserModelID(appid, /)\n--\n\n"
+     "Wrapper for Windows's SetCurrentProcessExplicitAppUserModelID.\n\n"
+     "On non-Windows platforms, does nothing."},
+    {"Win32_GetForegroundWindow",
+     (PyCFunction)mpl_GetForegroundWindow, METH_NOARGS,
+     "Win32_GetForegroundWindow()\n--\n\n"
+     "Wrapper for Windows' GetForegroundWindow.\n\n"
+     "On non-Windows platforms, always returns None."},
+    {"Win32_SetForegroundWindow",
+     (PyCFunction)mpl_SetForegroundWindow, METH_O,
+     "Win32_SetForegroundWindow(hwnd, /)\n--\n\n"
+     "Wrapper for Windows' SetForegroundWindow.\n\n"
+     "On non-Windows platforms, does nothing."},
+    {"Win32_SetProcessDpiAwareness_max",
+     (PyCFunction)mpl_SetProcessDpiAwareness_max, METH_NOARGS,
+     "Win32_SetProcessDpiAwareness_max()\n--\n\n"
+     "Set Windows' process DPI awareness to best option available.\n\n"
+     "On non-Windows platforms, does nothing."},
+    {NULL, NULL}};  // sentinel.
+static PyModuleDef util_module = {
+    PyModuleDef_HEAD_INIT, "_c_internal_utils", NULL, 0, functions
+};
+
+#pragma GCC visibility push(default)
+PyMODINIT_FUNC PyInit__c_internal_utils(void)
+{
+    return PyModule_Create(&util_module);
+}