diff --git a/src/common/QskShadowMetrics.h b/src/common/QskShadowMetrics.h
index f8a232a4..b1c55f16 100644
--- a/src/common/QskShadowMetrics.h
+++ b/src/common/QskShadowMetrics.h
@@ -35,6 +35,8 @@ class QSK_EXPORT QskShadowMetrics
     constexpr bool operator==( const QskShadowMetrics& ) const noexcept;
     constexpr bool operator!=( const QskShadowMetrics& ) const noexcept;
 
+    bool isNull() const noexcept;
+
     void setSpreadRadius( qreal ) noexcept;
     constexpr qreal spreadRadius() const noexcept;
 
@@ -158,6 +160,12 @@ inline constexpr QPointF QskShadowMetrics::offset() const noexcept
     return m_offset;
 }
 
+inline bool QskShadowMetrics::isNull() const noexcept
+{
+    return m_offset.isNull() &&
+        ( m_spreadRadius == 0.0 ) && ( m_blurRadius == 0.0 );
+}
+
 #ifndef QT_NO_DEBUG_STREAM
 
 QSK_EXPORT QDebug operator<<( QDebug, const QskShadowMetrics& );