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331 lines (304 loc) · 9.74 KB
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#include <Python.h>
/* Python.h must be included before any system headers,
to ensure visibility macros are properly set. */
#include <stdexcept>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
// Windows 10, for latest HiDPI API support.
#define WINVER 0x0A00
#if defined(_WIN32_WINNT)
#if _WIN32_WINNT < WINVER
#undef _WIN32_WINNT
#define _WIN32_WINNT WINVER
#endif
#else
#define _WIN32_WINNT WINVER
#endif
#endif
#include <pybind11/pybind11.h>
#ifdef __linux__
#include <dlfcn.h>
#endif
#ifdef _WIN32
#include <Objbase.h>
#include <Shobjidl.h>
#include <Windows.h>
#define UNUSED_ON_NON_WINDOWS(x) x
#else
#define UNUSED_ON_NON_WINDOWS Py_UNUSED
#endif
#ifdef __APPLE__
#include <dlfcn.h>
#include <CoreFoundation/CoreFoundation.h>
#include <CoreText/CoreText.h>
#include <ApplicationServices/ApplicationServices.h>
#endif
namespace py = pybind11;
using namespace pybind11::literals;
static bool
mpl_xdisplay_is_valid(void)
{
#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 = nullptr;
auto XOpenDisplay = (struct Display* (*)(char const*))
dlsym(libX11, "XOpenDisplay");
auto XCloseDisplay = (int (*)(struct Display*))
dlsym(libX11, "XCloseDisplay");
if (XOpenDisplay && XCloseDisplay
&& (display = XOpenDisplay(nullptr))) {
XCloseDisplay(display);
}
if (dlclose(libX11)) {
throw std::runtime_error(dlerror());
}
if (display) {
return true;
}
}
return false;
#else
return true;
#endif
}
static bool
mpl_display_is_valid(void)
{
#ifdef __linux__
if (mpl_xdisplay_is_valid()) {
return true;
}
void* libwayland_client;
if (getenv("WAYLAND_DISPLAY")
&& (libwayland_client = dlopen("libwayland-client.so.0", RTLD_LAZY))) {
struct wl_display* display = nullptr;
auto wl_display_connect = (struct wl_display* (*)(char const*))
dlsym(libwayland_client, "wl_display_connect");
auto wl_display_disconnect = (void (*)(struct wl_display*))
dlsym(libwayland_client, "wl_display_disconnect");
if (wl_display_connect && wl_display_disconnect
&& (display = wl_display_connect(nullptr))) {
wl_display_disconnect(display);
}
if (dlclose(libwayland_client)) {
throw std::runtime_error(dlerror());
}
if (display) {
return true;
}
}
return false;
#elif defined(__APPLE__)
CFDictionaryRef session_info;
session_info = CGSessionCopyCurrentDictionary();
if (session_info == NULL) {
return false;
}
CFRelease(session_info);
return true;
#else
return true;
#endif
}
static py::object
mpl_get_available_fonts(void)
{
#if defined(__APPLE__)
py::set fonts;
// Using CoreText before AppKit is loaded exposes a bug in NSFont<->CTFont
// toll-free bridging. Load AppKit now to avoid a future exception.
dlopen("/System/Library/Frameworks/AppKit.framework/AppKit", RTLD_NOW);
auto cfStringToPyStr = [](CFStringRef str) -> py::str {
auto cstr = CFStringGetCStringPtr(str, kCFStringEncodingUTF8);
if (cstr) {
return py::str(cstr);
}
auto length = CFStringGetLength(str);
auto maxSize = CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8) + 1;
auto buffer = std::make_unique<char[]>(maxSize);
py::str result;
if (CFStringGetCString(str, buffer.get(), maxSize, kCFStringEncodingUTF8)) {
result = py::str(buffer.get());
}
return result;
};
auto collection = CTFontCollectionCreateFromAvailableFonts(NULL);
auto descriptors = collection ?
CTFontCollectionCreateMatchingFontDescriptors(collection) : NULL;
auto count = descriptors ? CFArrayGetCount(descriptors) : 0;
for (CFIndex i = 0; i < count; i++) {
auto descriptor = static_cast<CTFontDescriptorRef>(
CFArrayGetValueAtIndex(descriptors, i));
auto url = static_cast<CFURLRef>(
CTFontDescriptorCopyAttribute(descriptor, kCTFontURLAttribute));
CFStringRef path = nullptr;
if (url) {
path = CFURLCopyFileSystemPath(url, kCFURLPOSIXPathStyle);
CFRelease(url);
}
if (path) {
auto pyStr = cfStringToPyStr(path);
if (pyStr) {
fonts.add(pyStr);
}
CFRelease(path);
}
}
if (descriptors) {
CFRelease(descriptors);
}
if (collection) {
CFRelease(collection);
}
return fonts;
#else
return py::none();
#endif
}
static py::object
mpl_GetCurrentProcessExplicitAppUserModelID(void)
{
#ifdef _WIN32
wchar_t* appid = NULL;
HRESULT hr = GetCurrentProcessExplicitAppUserModelID(&appid);
if (FAILED(hr)) {
PyErr_SetFromWindowsErr(hr);
throw py::error_already_set();
}
auto py_appid = py::cast(appid);
CoTaskMemFree(appid);
return py_appid;
#else
return py::none();
#endif
}
static void
mpl_SetCurrentProcessExplicitAppUserModelID(const wchar_t* UNUSED_ON_NON_WINDOWS(appid))
{
#ifdef _WIN32
HRESULT hr = SetCurrentProcessExplicitAppUserModelID(appid);
if (FAILED(hr)) {
PyErr_SetFromWindowsErr(hr);
throw py::error_already_set();
}
#endif
}
static py::object
mpl_GetForegroundWindow(void)
{
#ifdef _WIN32
if (HWND hwnd = GetForegroundWindow()) {
return py::capsule(hwnd, "HWND");
} else {
return py::none();
}
#else
return py::none();
#endif
}
static void
mpl_SetForegroundWindow(py::capsule UNUSED_ON_NON_WINDOWS(handle_p))
{
#ifdef _WIN32
if (strcmp(handle_p.name(), "HWND") != 0) {
throw std::runtime_error("Handle must be a value returned from Win32_GetForegroundWindow");
}
HWND handle = static_cast<HWND>(handle_p.get_pointer());
if (!SetForegroundWindow(handle)) {
throw std::runtime_error("Error setting window");
}
#endif
}
static void
mpl_SetProcessDpiAwareness_max(void)
{
#ifdef _WIN32
#ifdef _DPI_AWARENESS_CONTEXTS_
// These functions and options were added in later Windows 10 updates, so
// must be loaded dynamically.
HMODULE user32 = LoadLibrary("user32.dll");
auto IsValidDpiAwarenessContext = (BOOL (WINAPI *)(DPI_AWARENESS_CONTEXT))
GetProcAddress(user32, "IsValidDpiAwarenessContext");
auto SetProcessDpiAwarenessContext = (BOOL (WINAPI *)(DPI_AWARENESS_CONTEXT))
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 (IsValidDpiAwarenessContext && SetProcessDpiAwarenessContext) {
for (size_t i = 0; i < sizeof(ctxs) / sizeof(DPI_AWARENESS_CONTEXT); ++i) {
if (IsValidDpiAwarenessContext(ctxs[i])) {
SetProcessDpiAwarenessContext(ctxs[i]);
break;
}
}
} else {
// Added in Windows Vista.
SetProcessDPIAware();
}
FreeLibrary(user32);
#else
// Added in Windows Vista.
SetProcessDPIAware();
#endif
#endif
}
PYBIND11_MODULE(_c_internal_utils, m, py::mod_gil_not_used())
{
m.def(
"display_is_valid", &mpl_display_is_valid,
R"""( --
Check whether the current X11 or Wayland display is valid.
On Linux, returns True if either $DISPLAY is set and XOpenDisplay(NULL)
succeeds, or $WAYLAND_DISPLAY is set and wl_display_connect(NULL)
succeeds.
On macOS, returns True if CGSessionCopyCurrentDictionary is not NULL.
On other platforms, always returns True.)""");
m.def(
"xdisplay_is_valid", &mpl_xdisplay_is_valid,
R"""( --
Check whether the current X11 display is valid.
On Linux, returns True if either $DISPLAY is set and XOpenDisplay(NULL)
succeeds. Use this function if you need to specifically check for X11
only (e.g., for Tkinter).
On other platforms, always returns True.)""");
m.def(
"get_available_fonts", &mpl_get_available_fonts,
R"""( --
On macOS, uses CoreText to find all fonts available to the current
process and returns the paths as a set of strings.
On other platforms, always returns None.)""");
m.def(
"Win32_GetCurrentProcessExplicitAppUserModelID",
&mpl_GetCurrentProcessExplicitAppUserModelID,
R"""( --
Wrapper for Windows's GetCurrentProcessExplicitAppUserModelID.
On non-Windows platforms, always returns None.)""");
m.def(
"Win32_SetCurrentProcessExplicitAppUserModelID",
&mpl_SetCurrentProcessExplicitAppUserModelID,
"appid"_a, py::pos_only(),
R"""( --
Wrapper for Windows's SetCurrentProcessExplicitAppUserModelID.
On non-Windows platforms, does nothing.)""");
m.def(
"Win32_GetForegroundWindow", &mpl_GetForegroundWindow,
R"""( --
Wrapper for Windows' GetForegroundWindow.
On non-Windows platforms, always returns None.)""");
m.def(
"Win32_SetForegroundWindow", &mpl_SetForegroundWindow,
"hwnd"_a,
R"""( --
Wrapper for Windows' SetForegroundWindow.
On non-Windows platforms, does nothing.)""");
m.def(
"Win32_SetProcessDpiAwareness_max", &mpl_SetProcessDpiAwareness_max,
R"""( --
Set Windows' process DPI awareness to best option available.
On non-Windows platforms, does nothing.)""");
}