diff --git a/src/common/QskBoxShapeMetrics.cpp b/src/common/QskBoxShapeMetrics.cpp
index 174b9326..eb258185 100644
--- a/src/common/QskBoxShapeMetrics.cpp
+++ b/src/common/QskBoxShapeMetrics.cpp
@@ -54,18 +54,6 @@ void QskBoxShapeMetrics::setRadius( Qt::Corner corner, qreal radiusX, qreal radi
         qskSetRadius( radiusX, radiusY, m_radii[ corner ] );
 }
 
-QskBoxShapeMetrics QskBoxShapeMetrics::transposed() const noexcept
-{
-    QskBoxShapeMetrics other;
-
-    for ( int i = 0; i < 4; i++ )
-        other.m_radii[ i ] = m_radii[ i ].transposed();
-
-    other.m_sizeMode = m_sizeMode;
-
-    return other;
-}
-
 QskBoxShapeMetrics QskBoxShapeMetrics::toAbsolute( const QSizeF& size ) const noexcept
 {
     if ( m_sizeMode != Qt::RelativeSize )
@@ -82,29 +70,29 @@ QskBoxShapeMetrics QskBoxShapeMetrics::toAbsolute( const QSizeF& size ) const no
     {
         for ( int i = 0; i < 4; i++ )
         {
-            auto& radii = absoluted.m_radii[ i ];
+            auto& radius = absoluted.m_radii[ i ];
 
-            const qreal rx = qskAbsoluted( size.width(), radii.width() );
-            const qreal ry = qskAbsoluted( size.height(), radii.height() );
+            const qreal rx = qskAbsoluted( size.width(), radius.width() );
+            const qreal ry = qskAbsoluted( size.height(), radius.height() );
 
             switch ( m_aspectRatioMode )
             {
                 case Qt::IgnoreAspectRatio:
                 {
-                    radii.setWidth( rx );
-                    radii.setHeight( ry );
+                    radius.rwidth() = rx;
+                    radius.rheight() = ry;
                     break;
                 }
                 case Qt::KeepAspectRatio:
                 {
-                    radii.setWidth( std::min( rx, ry ) );
-                    radii.setHeight( std::min( rx, ry ) );
+                    radius.rwidth() = std::min( rx, ry );
+                    radius.rheight() = std::min( rx, ry );
                     break;
                 }
                 case Qt::KeepAspectRatioByExpanding:
                 {
-                    radii.setWidth( std::max( rx, ry ) );
-                    radii.setHeight( std::max( rx, ry ) );
+                    radius.rwidth() = std::max( rx, ry );
+                    radius.rheight() = std::max( rx, ry );
                     break;
                 }
             }
@@ -118,16 +106,17 @@ QskBoxShapeMetrics QskBoxShapeMetrics::toAbsolute( const QSizeF& size ) const no
 QskBoxShapeMetrics QskBoxShapeMetrics::interpolated(
     const QskBoxShapeMetrics& to, qreal ratio ) const noexcept
 {
+    // what about m_aspectRatioMode != to.m_aspectRatioMode ???
+
     if ( ( *this == to ) || ( m_sizeMode != to.m_sizeMode ) )
         return to;
 
-    QSizeF radii[ 4 ];
-    radii[ 0 ] = qskInterpolatedSize( m_radii[ 0 ], to.m_radii[ 0 ], ratio );
-    radii[ 1 ] = qskInterpolatedSize( m_radii[ 1 ], to.m_radii[ 1 ], ratio );
-    radii[ 2 ] = qskInterpolatedSize( m_radii[ 2 ], to.m_radii[ 2 ], ratio );
-    radii[ 3 ] = qskInterpolatedSize( m_radii[ 3 ], to.m_radii[ 3 ], ratio );
-
-    return QskBoxShapeMetrics( to.m_sizeMode, radii );
+    return QskBoxShapeMetrics(
+        qskInterpolatedSize( m_radii[ 0 ], to.m_radii[ 0 ], ratio ),
+        qskInterpolatedSize( m_radii[ 1 ], to.m_radii[ 1 ], ratio ),
+        qskInterpolatedSize( m_radii[ 2 ], to.m_radii[ 2 ], ratio ),
+        qskInterpolatedSize( m_radii[ 3 ], to.m_radii[ 3 ], ratio ),
+        to.m_sizeMode, to.m_aspectRatioMode );
 }
 
 QVariant QskBoxShapeMetrics::interpolate(
diff --git a/src/common/QskBoxShapeMetrics.h b/src/common/QskBoxShapeMetrics.h
index f78d4ac2..561e4f55 100644
--- a/src/common/QskBoxShapeMetrics.h
+++ b/src/common/QskBoxShapeMetrics.h
@@ -68,7 +68,7 @@ class QSK_EXPORT QskBoxShapeMetrics
 
     QskBoxShapeMetrics toAbsolute( const QSizeF& ) const noexcept;
 
-    QskBoxShapeMetrics transposed() const noexcept;
+    constexpr QskBoxShapeMetrics transposed() const noexcept;
 
     uint hash( uint seed = 0 ) const noexcept;
 
@@ -77,10 +77,12 @@ class QSK_EXPORT QskBoxShapeMetrics
 
   private:
     inline constexpr QskBoxShapeMetrics(
-            Qt::SizeMode sizeMode, const QSizeF radii[ 4 ] ) noexcept
-        : m_radii{ radii[ 0 ], radii[ 1 ], radii[ 2 ], radii[ 3 ] }
+            const QSizeF& topLeft, const QSizeF& topRight,
+            const QSizeF& bottomLeft, const QSizeF& bottomRight,
+            Qt::SizeMode sizeMode, Qt::AspectRatioMode aspectRatioMode ) noexcept
+        : m_radii{ topLeft, topRight, bottomLeft, bottomRight }
         , m_sizeMode( sizeMode )
-        , m_aspectRatioMode( Qt::KeepAspectRatio )
+        , m_aspectRatioMode( aspectRatioMode )
     {
     }
 
@@ -227,6 +229,14 @@ inline constexpr bool QskBoxShapeMetrics::isRectangle() const noexcept
         && ( ( m_radii[ 3 ].width() <= 0.0 ) && ( m_radii[ 3 ].height() <= 0.0 ) ) );
 }
 
+inline constexpr QskBoxShapeMetrics QskBoxShapeMetrics::transposed() const noexcept
+{
+    return QskBoxShapeMetrics(
+        m_radii[ 0 ].transposed(), m_radii[ 1 ].transposed(),
+        m_radii[ 2 ].transposed(), m_radii[ 3 ].transposed(),
+        m_sizeMode, m_aspectRatioMode );
+}
+
 #ifndef QT_NO_DEBUG_STREAM
 
 QSK_EXPORT QDebug operator<<( QDebug, const QskBoxShapeMetrics& );