1 files changed, 74 insertions, 0 deletions
diff --git a/src/plugins/multimedia/ffmpeg/qx11capturablewindows.cpp b/src/plugins/multimedia/ffmpeg/qx11capturablewindows.cpp
new file mode 100644
index 000000000..9e57cbc64
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/qx11capturablewindows.cpp
@@ -0,0 +1,74 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qx11capturablewindows_p.h"
+#include "private/qcapturablewindow_p.h"
+#include <qdebug.h>
+
+#include <X11/Xlib.h>
+
+QT_BEGIN_NAMESPACE
+
+QX11CapturableWindows::~QX11CapturableWindows()
+{
+    if (m_display)
+        XCloseDisplay(m_display);
+}
+
+QList<QCapturableWindow> QX11CapturableWindows::windows() const
+{
+    auto display = this->display();
+
+    if (!display)
+        return {};
+
+    Atom atom = XInternAtom(display, "_NET_CLIENT_LIST", true);
+    Atom actualType = 0;
+    int format = 0;
+    unsigned long windowsCount = 0;
+    unsigned long bytesAfter = 0;
+    unsigned char *data = nullptr;
+    const int status = XGetWindowProperty(display, XDefaultRootWindow(display), atom, 0L, (~0L),
+                                          false, AnyPropertyType, &actualType, &format,
+                                          &windowsCount, &bytesAfter, &data);
+
+    if (status < Success || !data)
+        return {};
+
+    QList<QCapturableWindow> result;
+
+    auto freeDataGuard = qScopeGuard([data]() { XFree(data); });
+    auto windows = reinterpret_cast<XID *>(data);
+    for (unsigned long i = 0; i < windowsCount; i++) {
+        auto windowData = std::make_unique<QCapturableWindowPrivate>();
+        windowData->id = static_cast<QCapturableWindowPrivate::Id>(windows[i]);
+
+        char *windowTitle = nullptr;
+        if (XFetchName(display, windows[i], &windowTitle) && windowTitle) {
+            windowData->description = QString::fromUtf8(windowTitle);
+            XFree(windowTitle);
+        }
+
+        if (isWindowValid(*windowData))
+            result.push_back(windowData.release()->create());
+    }
+
+    return result;
+}
+
+bool QX11CapturableWindows::isWindowValid(const QCapturableWindowPrivate &window) const
+{
+    auto display = this->display();
+    XWindowAttributes windowAttributes = {};
+    return display
+            && XGetWindowAttributes(display, static_cast<Window>(window.id), &windowAttributes) != 0
+            && windowAttributes.depth > 0;
+}
+
+Display *QX11CapturableWindows::display() const
+{
+    std::call_once(m_displayOnceFlag, [this]() { m_display = XOpenDisplay(nullptr); });
+    return m_display;
+}
+
+QT_END_NAMESPACE