Show cursor in Windows stream preview

tools/chatgui/src/stream_publish_engine.cpp

@@ -57,6 +57,24 @@ QByteArray screenId(QScreen* screen) {
     return QJsonDocument(QJsonArray{screen->name(), screen->manufacturer(), screen->model(), screen->serialNumber(), duplicate})
         .toJson(QJsonDocument::Compact);
 }
+#ifdef UTUN_STREAM_WIN_CURSOR
+QVideoFrame previewFrameFromImage(const QImage& source) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
+    return QVideoFrame(source);
+#else
+    QImage image = source.convertToFormat(QImage::Format_RGBA8888);
+    QVideoFrame frame(QVideoFrameFormat(image.size(), QVideoFrameFormat::Format_RGBA8888));
+    if (!frame.map(QVideoFrame::WriteOnly)) {
+        DEBUG_WARN(DEBUG_CATEGORY_VIDEO, "desktop preview frame map failed size=%dx%d", image.width(), image.height());
+        return {};
+    }
+    for (int y = 0; y < image.height(); y++)
+        std::memcpy(frame.bits(0) + y * frame.bytesPerLine(0), image.constScanLine(y), image.width() * 4);
+    frame.unmap();
+    return frame;
+#endif
+}
+#endif
 #endif
 }
 struct StreamPublishEngine::Impl {
@@ -318,7 +336,9 @@ bool StreamPublishEngine::openSource(const StreamPublishConfig& config) {
             }
             int fps = std::clamp(m->wanted.video.fps, 1, 60);
             convert = !m->lastImageCaptureAt || callbackAt - m->lastImageCaptureAt >= 1000000 / fps;
+#ifndef UTUN_STREAM_WIN_CURSOR
             m->previewFrame = frame;
+#endif
             if (!convert) { m->wake.notify_all(); return; }
             m->lastImageCaptureAt = callbackAt;
             if (m->framePts < 0 && m->wanted.source.id == "portal") m->started = monotonicUs();
@@ -510,6 +530,9 @@ void StreamPublishEngine::imageLoop() {
             QMetaObject::invokeMethod(this, [this, generation] { sourceFailed(generation, text("Could not capture the mouse cursor")); });
             continue;
         }
+        QVideoFrame preview = previewFrameFromImage(image);
+        if (!preview.isValid()) DEBUG_WARN(DEBUG_CATEGORY_VIDEO, "desktop preview frame unavailable generation=%llu",
+            (unsigned long long)generation);
 #endif
 #if QT_VERSION >= QT_VERSION_CHECK(6, 7, 0)
         if (frame.rotation() != QtVideo::Rotation::None) image = image.transformed(QTransform().rotate(static_cast<int>(frame.rotation())));
@@ -522,6 +545,9 @@ void StreamPublishEngine::imageLoop() {
             std::lock_guard<std::mutex> guard(m->lock);
             if (m->imageStop) return;
             if (!m->running || generation != m->sourceGeneration) continue;
+#ifdef UTUN_STREAM_WIN_CURSOR
+            if (preview.isValid()) m->previewFrame = std::move(preview);
+#endif
             if (m->framePts < 0 && m->wanted.source.id == "portal") m->started = monotonicUs();
             m->latestImage = image; m->frame = std::move(image); m->framePts = pts; m->frameGeneration = m->generation;
             if (!m->convertedCaptureFrames++) DEBUG_INFO(DEBUG_CATEGORY_VIDEO,