FrameSvgItem: add "mask" property

Summary:
This property allows e.g. the Plasma shell to query the shape a panel has
when defining the area for BlurBehind.

Reviewers: #plasma, mart

Reviewed By: #plasma, mart

Subscribers: kde-frameworks-devel

Tags: #frameworks

Differential Revision: https://phabricator.kde.org/D20202

src/declarativeimports/core/framesvgitem.cpp

@@ -272,6 +272,7 @@ FrameSvgItem::FrameSvgItem(QQuickItem *parent)
     connect(&Units::instance(), &Units::devicePixelRatioChanged, this, &FrameSvgItem::updateDevicePixelRatio);
     connect(m_frameSvg, &Svg::fromCurrentThemeChanged, this, &FrameSvgItem::fromCurrentThemeChanged);
     connect(m_frameSvg, &Svg::statusChanged, this, &FrameSvgItem::statusChanged);
+    connect(m_frameSvg, &Svg::sizeChanged, this, &FrameSvgItem::maskChanged);
 }
 
 FrameSvgItem::~FrameSvgItem()
@@ -455,6 +456,12 @@ bool FrameSvgItem::hasElementPrefix(const QString &prefix) const
     return m_frameSvg->hasElementPrefix(prefix);
 }
 
+
+QRegion FrameSvgItem::mask() const
+{
+    return m_frameSvg->mask();
+}
+
 void FrameSvgItem::geometryChanged(const QRectF &newGeometry,
                                    const QRectF &oldGeometry)
 {

src/declarativeimports/core/framesvgitem.h

@@ -183,6 +183,12 @@ class FrameSvgItem : public QQuickItem
      */
     Q_PROPERTY(Plasma::Svg::Status status READ status WRITE setStatus NOTIFY statusChanged)
 
+    /**
+     * The mask that tightly contains the painted areas
+     * @since 5.58
+     */
+    Q_PROPERTY(QRegion mask READ mask NOTIFY maskChanged)
+
 public:
     /**
      * @return true if the svg has the necessary elements with the given prefix
@@ -220,6 +226,8 @@ public:
     void geometryChanged(const QRectF &newGeometry,
                          const QRectF &oldGeometry) override;
 
+    QRegion mask() const;
+
     /**
      * Only to be used from inside this library, is not intended to be invokable
      */
@@ -244,6 +252,7 @@ Q_SIGNALS:
     void repaintNeeded();
     void statusChanged();
     void usedPrefixChanged();
+    void maskChanged();
 
 private Q_SLOTS:
     void doUpdate();

src/plasmaquick/dialog.cpp

@@ -241,13 +241,13 @@ void DialogPrivate::updateTheme()
             frameSvgItem->setImagePath(QStringLiteral("dialogs/background"));
         }
 
-        KWindowEffects::enableBlurBehind(q->winId(), theme.blurBehindEnabled(), frameSvgItem->frameSvg()->mask());
+        KWindowEffects::enableBlurBehind(q->winId(), theme.blurBehindEnabled(), frameSvgItem->mask());
 
         KWindowEffects::enableBackgroundContrast(q->winId(), theme.backgroundContrastEnabled(),
                 theme.backgroundContrast(),
                 theme.backgroundIntensity(),
                 theme.backgroundSaturation(),
-                frameSvgItem->frameSvg()->mask());
+                frameSvgItem->mask());
 
         if (KWindowSystem::compositingActive()) {
             if (hasMask) {
@@ -256,7 +256,7 @@ void DialogPrivate::updateTheme()
             }
         } else {
             hasMask = true;
-            q->setMask(frameSvgItem->frameSvg()->mask());
+            q->setMask(frameSvgItem->mask());
         }
         if (q->isVisible()) {
             DialogShadows::self()->addWindow(q, frameSvgItem->enabledBorders());