Advance Wayland and KDE package bring-up

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/kde/kf6-knotifications/source/src/imageconverter.cpp

@@ -0,0 +1,78 @@
+/*
+    SPDX-FileCopyrightText: 2009 Canonical
+    SPDX-FileContributor: Aurélien Gâteau <aurelien.gateau@canonical.com>
+
+    SPDX-License-Identifier: LGPL-2.0-only OR LGPL-3.0-only
+*/
+
+#include "imageconverter.h"
+
+#include <QDBusArgument>
+#include <QDBusMetaType>
+#include <QImage>
+
+namespace ImageConverter
+{
+/**
+ * A structure representing an image which can be marshalled to fit the
+ * notification spec.
+ */
+struct SpecImage {
+    int width, height, rowStride;
+    bool hasAlpha;
+    int bitsPerSample, channels;
+    QByteArray data;
+};
+
+QDBusArgument &operator<<(QDBusArgument &argument, const SpecImage &image)
+{
+    argument.beginStructure();
+    argument << image.width << image.height << image.rowStride << image.hasAlpha;
+    argument << image.bitsPerSample << image.channels << image.data;
+    argument.endStructure();
+    return argument;
+}
+
+const QDBusArgument &operator>>(const QDBusArgument &argument, SpecImage &image)
+{
+    argument.beginStructure();
+    argument >> image.width >> image.height >> image.rowStride >> image.hasAlpha;
+    argument >> image.bitsPerSample >> image.channels >> image.data;
+    argument.endStructure();
+    return argument;
+}
+
+} // namespace
+
+// This must be before the QVariant::fromValue below (#211726)
+Q_DECLARE_METATYPE(ImageConverter::SpecImage)
+
+namespace ImageConverter
+{
+QVariant variantForImage(const QImage &_image)
+{
+    qDBusRegisterMetaType<SpecImage>();
+
+    const bool hasAlpha = _image.hasAlphaChannel();
+    QImage image;
+    if (hasAlpha) {
+        image = _image.convertToFormat(QImage::Format_RGBA8888);
+    } else {
+        image = _image.convertToFormat(QImage::Format_RGB888);
+    }
+
+    QByteArray data((const char *)image.constBits(), image.sizeInBytes());
+
+    SpecImage specImage;
+    specImage.width = image.width();
+    specImage.height = image.height();
+    specImage.rowStride = image.bytesPerLine();
+    specImage.hasAlpha = hasAlpha;
+    specImage.bitsPerSample = 8;
+    specImage.channels = hasAlpha ? 4 : 3;
+    specImage.data = data;
+
+    return QVariant::fromValue(specImage);
+}
+
+} // namespace