Fix menu blur in HiDPI

debian/changelog

@@ -1,5 +1,5 @@
-cutefish-qtplugins (0.5) UNRELEASED; urgency=high
+cutefish-qt-plugins (0.5) UNRELEASED; urgency=high
 
   * Initial release (CutefishOS)  <support@cutefishos.com>
 
- -- CutefishOS Packaging Team <support@cutefishos.com>  Thu, 16 Sep 2021 02:31:42 +0800
+ -- CutefishOS Packaging Team <support@cutefishos.com>  Thu, 16 Sep 2021 02:31:42 +0800

debian/control

@@ -1,4 +1,4 @@
-Source: cutefish-qtplugins
+Source: cutefish-qt-plugins
 Section: devel
 Priority: optional
 Maintainer: CutefishOS <support@cutefishos.com>
@@ -20,7 +20,7 @@ Build-Depends: cmake,
 Standards-Version: 4.5.0
 Homepage: https://cutefishos.com
 
-Package: cutefish-qtplugins
+Package: cutefish-qt-plugins
 Architecture: any
 Depends: ${misc:Depends},
          ${shlibs:Depends}

widgetstyle/basestyle.cpp

@@ -2170,10 +2170,12 @@ void BaseStyle::drawPrimitive(PrimitiveElement elem,
 
         // blur
         if (widget && widget->window()) {
-            QPainterPath path;
-            path.addRoundedRect(option->rect, Phantom::DefaultFrame_Radius, Phantom::DefaultFrame_Radius);
-            const_cast<QWidget *>(widget)->setMask(path.toFillPolygon().toPolygon());
-            m_blurHelper->update(const_cast<QWidget *>(widget));
+//            QPainterPath path;
+//            path.addRoundedRect(option->rect, Phantom::DefaultFrame_Radius, Phantom::DefaultFrame_Radius);
+//            const_cast<QWidget *>(widget)->setMask(path.toFillPolygon().toPolygon());
+//            m_blurHelper->update(const_cast<QWidget *>(widget));
+
+            m_blurHelper->enableBlurBehind(const_cast<QWidget *>(widget), true, Phantom::DefaultFrame_Radius);
         }
 
         painter->restore();
@@ -4481,7 +4483,7 @@ void BaseStyle::polish(QWidget *widget)
 
     if (qobject_cast<QMenu *>(widget)) {
         widget->setAttribute(Qt::WA_TranslucentBackground, true);
-        m_blurHelper->registerWidget(widget);
+        // m_blurHelper->registerWidget(widget);
     }
 
     if (widget->inherits("QTipLabel") || widget->inherits("QComboBoxPrivateContainer")) {
@@ -4510,7 +4512,7 @@ void BaseStyle::unpolish(QWidget *widget)
 
     if (qobject_cast<QMenu *>(widget)) {
         widget->setAttribute(Qt::WA_TranslucentBackground, false);
-        m_blurHelper->unregisterWidget(widget);
+        // m_blurHelper->unregisterWidget(widget);
     }
 
     if (widget->inherits("QTipLabel")) {

widgetstyle/blurhelper.cpp

@@ -36,6 +36,8 @@
 
 // Qt
 #include <QWidget>
+#include <QScreen>
+#include <QRect>
 #include <QVariant>
 #include <QEvent>
 #include <QPainterPath>
@@ -110,3 +112,41 @@ void BlurHelper::update(QWidget *widget) const
         widget->update();
     }
 }
+
+void BlurHelper::enableBlurBehind(QWidget *widget, bool enable, qreal windowRadius)
+{
+    if (!widget)
+        return;
+
+    xcb_connection_t *c = QX11Info::connection();
+    if (!c)
+        return;
+
+    const QByteArray effectName = QByteArrayLiteral("_KDE_NET_WM_BLUR_BEHIND_REGION");
+    xcb_intern_atom_cookie_t atomCookie = xcb_intern_atom_unchecked(c, false, effectName.length(), effectName.constData());
+    QScopedPointer<xcb_intern_atom_reply_t, QScopedPointerPodDeleter> atom(xcb_intern_atom_reply(c, atomCookie, nullptr));
+    if (!atom)
+        return;
+
+    if (enable) {
+        qreal devicePixelRatio = widget->screen()->devicePixelRatio();
+        QPainterPath path;
+        path.addRoundedRect(QRectF(QPoint(0, 0), widget->size() * devicePixelRatio),
+                            windowRadius * devicePixelRatio,
+                            windowRadius * devicePixelRatio);
+        QVector<uint32_t> data;
+        for (const QPolygonF &polygon : path.toFillPolygons()) {
+            QRegion region = polygon.toPolygon();
+            for (auto i = region.begin(); i != region.end(); ++i) {
+                data << i->x() << i->y() << i->width() << i->height();
+            }
+        }
+
+        xcb_change_property(c, XCB_PROP_MODE_REPLACE, widget->winId(),
+                            atom->atom, XCB_ATOM_CARDINAL,
+                            32, data.size(), data.constData());
+
+    } else {
+        xcb_delete_property(c, widget->winId(), atom->atom);
+    }
+}

widgetstyle/blurhelper.h

@@ -46,6 +46,8 @@ public:
 
     void update(QWidget *) const;
 
+    void enableBlurBehind(QWidget *widget, bool enable = true, qreal windowRadius = 0.0);
+
 protected:
     void addEventFilter(QObject *object) {
         object->removeEventFilter(this);