diff --git a/designsystems/fluent2/QskFluent2Skin.cpp b/designsystems/fluent2/QskFluent2Skin.cpp
index 5455b3f4..c811bc8f 100644
--- a/designsystems/fluent2/QskFluent2Skin.cpp
+++ b/designsystems/fluent2/QskFluent2Skin.cpp
@@ -30,8 +30,6 @@
 
       - Indicator subcontrol might be better than using the border of the selection box
       - cell padding unclear
-
-    - using qskDpToPixels ?
  */
 
 /*
@@ -134,14 +132,17 @@ namespace Fluent2
 
 namespace
 {
-    Q_DECL_UNUSED inline double operator ""_px( long double value )
+    /*
+        mapping between px and logical coordinates
+     */
+    inline constexpr double operator ""_px( long double value )
     {
-        return qskPxToPixels( static_cast< qreal >( value ) );
+        return static_cast< double >( value );
     }
 
-    Q_DECL_UNUSED inline double operator ""_px( unsigned long long value )
+    inline constexpr double operator ""_px( unsigned long long value )
     {
-        return qskPxToPixels( value );
+        return static_cast< double >( value );
     }
 
     inline constexpr QRgb rgbGray( int value, qreal opacity = 1.0 )
@@ -2073,10 +2074,9 @@ void QskFluent2Skin::initHints()
     addTheme( QskAspect::Footer, themeHeader );
 }
 
-static inline QFont createFont( int size, int lineHeight, QFont::Weight weight )
+static inline QFont createFont( qreal size, int lineHeight, QFont::Weight weight )
 {
     Q_UNUSED( lineHeight ); // TODO ...
-    const int pixelSize = qRound( qskPxToPixels( size ) );
 
     QFont font( QStringLiteral( "Segoe UI" ), -1, weight );
 
@@ -2092,7 +2092,8 @@ static inline QFont createFont( int size, int lineHeight, QFont::Weight weight )
         checkFont = false;
     }
 
-    font.setPixelSize( pixelSize );
+    // px: 1/96 inch, pt: 1/72 inch
+    font.setPointSizeF( size * 72.0 / 96.0 );
 
     return font;
 }
@@ -2101,18 +2102,18 @@ void QskFluent2Skin::setupFonts()
 {
     // see: https://fluent2.microsoft.design/typography ( Windows )
 
-    setFont( Fluent2::Caption, createFont( 12, 16, QFont::Normal ) );
+    setFont( Fluent2::Caption, createFont( 12_px, 16_px, QFont::Normal ) );
 
-    setFont( Fluent2::Body, createFont( 14, 20, QFont::Normal ) );
-    setFont( Fluent2::BodyStrong, createFont( 14, 20, QFont::DemiBold ) );
-    setFont( Fluent2::BodyStronger, createFont( 18, 24, QFont::Normal ) );
+    setFont( Fluent2::Body, createFont( 14_px, 20_px, QFont::Normal ) );
+    setFont( Fluent2::BodyStrong, createFont( 14_px, 20_px, QFont::DemiBold ) );
+    setFont( Fluent2::BodyStronger, createFont( 18_px, 24_px, QFont::Normal ) );
 
-    setFont( Fluent2::Subtitle, createFont( 20, 28, QFont::DemiBold ) );
+    setFont( Fluent2::Subtitle, createFont( 20_px, 28_px, QFont::DemiBold ) );
 
-    setFont( Fluent2::Title, createFont( 28, 36, QFont::Normal ) );
-    setFont( Fluent2::LargeTitle, createFont( 40, 52, QFont::DemiBold ) );
+    setFont( Fluent2::Title, createFont( 28_px, 36_px, QFont::Normal ) );
+    setFont( Fluent2::LargeTitle, createFont( 40_px, 52_px, QFont::DemiBold ) );
 
-    setFont( Fluent2::Display, createFont( 68, 92, QFont::DemiBold ) );
+    setFont( Fluent2::Display, createFont( 68_px, 92_px, QFont::DemiBold ) );
 
     // to have something for the unused roles
     QskSkin::completeFontTable();
diff --git a/designsystems/fusion/QskFusionSkin.cpp b/designsystems/fusion/QskFusionSkin.cpp
index 5feceb48..bad14860 100644
--- a/designsystems/fusion/QskFusionSkin.cpp
+++ b/designsystems/fusion/QskFusionSkin.cpp
@@ -80,14 +80,17 @@ namespace
         }
     };
 
-    Q_DECL_UNUSED inline double operator ""_dp( long double value )
+    /*
+        mapping between px and logical coordinates
+     */
+    inline double operator ""_px( long double value )
     {
-        return qskDpToPixels( static_cast< qreal >( value ) );
+        return static_cast< double >( value );
     }
 
-    Q_DECL_UNUSED inline double operator ""_dp( unsigned long long value )
+    inline double operator ""_px( unsigned long long value )
     {
-        return qskDpToPixels( value );
+        return static_cast< double >( value );
     }
 
     class Editor : private QskSkinHintTableEditor
@@ -186,14 +189,14 @@ void Editor::setupCheckBox()
     using A = QskAspect;
     using P = QPalette;
 
-    setSpacing( Q::Panel, 6_dp );
+    setSpacing( Q::Panel, 6_px );
 
-    setStrutSize( Q::Box, 18_dp, 18_dp );
-    setBoxShape( Q::Box, 2_dp );
+    setStrutSize( Q::Box, 18_px, 18_px );
+    setBoxShape( Q::Box, 2_px );
 
     setBoxBorderColors( Q::Box, m_pal.outline );
     setBoxBorderColors( Q::Box | Q::Error, m_pal.error );
-    setBoxBorderMetrics( Q::Box, 1_dp );
+    setBoxBorderMetrics( Q::Box, 1_px );
 
 #ifdef SHOW_FOCUS
     setBoxBorderColors( Q::Box | Q::Focused, m_pal.highlightedOutline,
@@ -221,7 +224,7 @@ void Editor::setupCheckBox()
     setGraphicRole( Q::Indicator | Q::Disabled, QskFusionSkin::GraphicDisabled );
     setGraphicRole( Q::Indicator | Q::Error, QskFusionSkin::GraphicError );
 
-    setPadding( Q::Box, 3_dp );
+    setPadding( Q::Box, 3_px );
     const auto checkMark = symbol( "checkMark" );
 
     for ( auto state : { QskAspect::NoState, Q::Disabled } )
@@ -251,10 +254,10 @@ void Editor::setupComboBox()
     setColor( Q::Text, m_pal.active( P::ButtonText ) );
     setColor( Q::Text | Q::Disabled, m_pal.disabled( P::ButtonText ) );
 
-    setStrutSize( Q::Panel,  -1.0, 32_dp );
+    setStrutSize( Q::Panel,  -1.0, 32_px );
 
     setBoxShape( Q::Panel, 2 );
-    setBoxBorderMetrics( Q::Panel, 1_dp );
+    setBoxBorderMetrics( Q::Panel, 1_px );
     setBoxBorderColors( Q::Panel, m_pal.outline );
 
 #ifdef SHOW_FOCUS
@@ -262,8 +265,8 @@ void Editor::setupComboBox()
         Combination( { Q::Hovered, Q::Pressed } ) );
 #endif
 
-    setPadding( Q::Panel, 8_dp, 4_dp, 8_dp, 4_dp );
-    setSpacing( Q::Panel, 8_dp );
+    setPadding( Q::Panel, 8_px, 4_px, 8_px, 4_px );
+    setSpacing( Q::Panel, 8_px );
 
     // should be similar for QskPushButton
     auto rgbFill = m_pal.button;
@@ -274,10 +277,10 @@ void Editor::setupComboBox()
 
     setGradient( Q::Panel | Q::Pressed, QskRgb::darker( rgbFill, 110 ) );
 
-    setStrutSize( Q::Icon, 20_dp, 20_dp );
+    setStrutSize( Q::Icon, 20_px, 20_px );
     setGraphicRole( Q::Icon | Q::Disabled, QskFusionSkin::GraphicDisabled );
 
-    setStrutSize( Q::StatusIndicator, 10_dp, 10_dp );
+    setStrutSize( Q::StatusIndicator, 10_px, 10_px );
     setGraphicRole( Q::StatusIndicator, QskFusionSkin::GraphicIndicator );
     setGraphicRole( Q::StatusIndicator | Q::Disabled, QskFusionSkin::GraphicDisabled );
 
@@ -308,8 +311,8 @@ void Editor::setupMenu()
     setHint( Q::Overlay | A::Style, true );
     setGradient( Q::Overlay, QColor( 220, 220, 220, 100 ) );
 
-    setBoxShape( Q::Panel, 4_dp );
-    setBoxBorderMetrics( Q::Panel, 1_dp );
+    setBoxShape( Q::Panel, 4_px );
+    setBoxBorderMetrics( Q::Panel, 1_px );
 
     for ( auto state : { A::NoState, Q::Disabled } )
     {
@@ -322,8 +325,8 @@ void Editor::setupMenu()
     const bool isCascading = qskMaybeDesktopPlatform();
     setHint( Q::Panel | A::Style, isCascading );
 
-    setMetric( Q::Separator | A::Size, 1_dp );
-    setMargin( Q::Separator, QskMargins( 5_dp, 2_dp, 5_dp, 2_dp ) );
+    setMetric( Q::Separator | A::Size, 1_px );
+    setMargin( Q::Separator, QskMargins( 5_px, 2_px, 5_px, 2_px ) );
     setBoxShape( Q::Separator, 0 );
     setBoxBorderMetrics( Q::Separator, 0 );
 
@@ -344,7 +347,7 @@ void Editor::setupMenu()
             m_pal.color( colorGroup, P::HighlightedText ) );
     }
 
-    setPadding( Q::Icon, 8_dp );
+    setPadding( Q::Icon, 8_px );
 
     setGraphicRole( Q::Icon, QskFusionSkin::GraphicNormal );
     setGraphicRole( Q::Icon | Q::Disabled, QskFusionSkin::GraphicDisabled );
@@ -397,7 +400,7 @@ void Editor::setupTextInput()
 
     }
 
-    setBoxBorderMetrics( Q::Panel, 1_dp );
+    setBoxBorderMetrics( Q::Panel, 1_px );
 
     setBoxBorderColors( Q::Panel, m_pal.outline );
 #ifdef SHOW_FOCUS
@@ -405,7 +408,7 @@ void Editor::setupTextInput()
 #endif
 
     setBoxShape( Q::Panel, 2 );
-    setPadding( Q::Panel, 4_dp );
+    setPadding( Q::Panel, 4_px );
 }
 
 void Editor::setupProgressBar()
@@ -484,17 +487,17 @@ void Editor::setupRadioBox()
     using A = QskAspect;
     using P = QPalette;
 
-    setSpacing( Q::Panel, 10_dp );
-    setSpacing( Q::Button, 10_dp );
+    setSpacing( Q::Panel, 10_px );
+    setSpacing( Q::Button, 10_px );
 
-    setStrutSize( Q::CheckIndicatorPanel, 20_dp, 20_dp );
+    setStrutSize( Q::CheckIndicatorPanel, 20_px, 20_px );
 
     for ( auto subControl : { Q::CheckIndicatorPanel, Q::CheckIndicator } )
         setBoxShape( subControl, 100, Qt::RelativeSize ); // circular
 
-    setBoxBorderMetrics( Q::CheckIndicatorPanel, 1_dp );
+    setBoxBorderMetrics( Q::CheckIndicatorPanel, 1_px );
 
-    setPadding( Q::CheckIndicatorPanel, 6_dp );
+    setPadding( Q::CheckIndicatorPanel, 6_px );
 
     setGradient( Q::Button, QskGradient() );
 
@@ -577,15 +580,15 @@ void Editor::setupSegmentedBar()
         // Panel
 
         setPadding( Q::Panel, 0 );
-        setSpacing( Q::Panel, 5_dp );
+        setSpacing( Q::Panel, 5_px );
 
         setGradient( Q::Panel, m_pal.active( P::Base ) );
         setGradient( Q::Panel | Q::Disabled, m_pal.disabled( P::Base ) );
 
-        setBoxBorderMetrics( Q::Panel, 1_dp );
+        setBoxBorderMetrics( Q::Panel, 1_px );
         setBoxBorderColors( Q::Panel, m_pal.outline );
 
-        const QSizeF strutSize( 100_dp, 16_dp );
+        const QSizeF strutSize( 100_px, 16_px );
 
         setStrutSize( Q::Panel | A::Horizontal, strutSize );
         setStrutSize( Q::Panel | A::Vertical, strutSize.transposed() );
@@ -594,7 +597,7 @@ void Editor::setupSegmentedBar()
     {
         // Segment
 
-        setPadding( Q::Segment, QskMargins( 2_dp, 5_dp, 2_dp, 5_dp ) );
+        setPadding( Q::Segment, QskMargins( 2_px, 5_px, 2_px, 5_px ) );
         setGradient( Q::Segment, QskGradient() );
     }
 
@@ -633,7 +636,7 @@ void Editor::setupSegmentedBar()
         setGraphicRole( Q::Icon | Q::Disabled, QskFusionSkin::GraphicDisabled );
         setGraphicRole( Q::Icon | Q::Selected, QskFusionSkin::GraphicHighlighted );
 
-        setStrutSize( Q::Icon, -1, 24_dp );
+        setStrutSize( Q::Icon, -1, 24_px );
     }
 }
 
@@ -642,7 +645,7 @@ void Editor::setupSeparator()
     using Q = QskSeparator;
     using A = QskAspect;
 
-    setMetric( Q::Panel | A::Size, 2_dp );
+    setMetric( Q::Panel | A::Size, 2_px );
     setBoxShape( Q::Panel, 0 );
     setBoxBorderMetrics( Q::Panel, 0 );
     setGradient( Q::Panel, QskRgb::lighter( m_pal.outline, 108 ) );
@@ -654,7 +657,7 @@ void Editor::setupPageIndicator()
     using A = QskAspect;
     using P = QPalette;
 
-    const auto extent = 8_dp;
+    const auto extent = 8_px;
     setStrutSize( Q::Bullet, extent, extent );
 
     // circles, without border
@@ -677,7 +680,7 @@ void Editor::setupPageIndicator()
 
     setAnimation( Q::Bullet | A::Color, 100 );
 
-    setSpacing( Q::Panel, 4_dp );
+    setSpacing( Q::Panel, 4_px );
     setGradient( Q::Panel, QskGradient() ); // invisible
 }
 
@@ -691,7 +694,7 @@ void Editor::setupPushButton()
     using A = QskAspect;
     using P = QPalette;
 
-    setStrutSize( Q::Panel, 40_dp, 8_dp );
+    setStrutSize( Q::Panel, 40_px, 8_px );
 
     setPadding( Q::Panel, 4 );
     setMetric( Q::Panel | A::Spacing, 4 );
@@ -723,7 +726,7 @@ void Editor::setupPushButton()
     setGraphicRole( Q::Icon, QskFusionSkin::GraphicNormal );
     setGraphicRole( Q::Icon | Q::Disabled, QskFusionSkin::GraphicDisabled );
 
-    setStrutSize( Q::Icon, 22_dp, 22_dp );
+    setStrutSize( Q::Icon, 22_px, 22_px );
 }
 
 void Editor::setupDialogButtonBox()
@@ -733,7 +736,7 @@ void Editor::setupDialogButtonBox()
 
     setBoxShape( Q::Panel, 0 );
     setBoxBorderMetrics( Q::Panel, 0 );
-    setPadding( Q::Panel, 2_dp, 4_dp, 2_dp, 0_dp );
+    setPadding( Q::Panel, 2_px, 4_px, 2_px, 0_px );
 
     setGradient( Q::Panel, m_pal.active( P::Base ) );
     setGradient( Q::Panel | Q::Disabled, m_pal.disabled( P::Base ) );
@@ -772,7 +775,7 @@ void Editor::setupSlider()
     using Q = QskSlider;
     using P = QPalette;
 
-    const qreal extent = 30_dp;
+    const qreal extent = 30_px;
 
     // Panel
 
@@ -791,9 +794,9 @@ void Editor::setupSlider()
         setPadding( subControl, 0 );
 
         setBoxShape( subControl, 0 );
-        setBoxBorderMetrics( subControl, 1_dp );
+        setBoxBorderMetrics( subControl, 1_px );
 
-        setMetric( subControl | A::Size, 6_dp );
+        setMetric( subControl | A::Size, 6_px );
     }
 
     {
@@ -829,7 +832,7 @@ void Editor::setupSlider()
         Combination( { Q::Hovered, Q::Pressed } ) );
 #endif
 
-    setStrutSize( Q::Handle, 16_dp, 16_dp );
+    setStrutSize( Q::Handle, 16_px, 16_px );
 
     for ( auto state : { A::NoState, Q::Pressed } )
     {
@@ -854,16 +857,16 @@ void Editor::setupSpinBox()
     using P = QPalette;
 
     setHint( Q::Panel | A::Style, Q::UpDownControl );
-    setSpacing( Q::Panel, 0_dp );
-    setBoxShape( Q::Panel, 2_dp );
-    setBoxBorderMetrics( Q::Panel, 0_dp );
+    setSpacing( Q::Panel, 0_px );
+    setBoxShape( Q::Panel, 2_px );
+    setBoxBorderMetrics( Q::Panel, 0_px );
     //setBoxBorderColors( Q::Panel, m_pal.outline );
 
-    setPadding( Q::TextPanel, 5_dp );
+    setPadding( Q::TextPanel, 5_px );
     setBoxShape( Q::TextPanel, 2, 0, 2, 0 );
     setGradient( Q::TextPanel | Q::Disabled, m_pal.disabled( P::Base ) );
 
-    setBoxBorderMetrics( Q::TextPanel, 1_dp );
+    setBoxBorderMetrics( Q::TextPanel, 1_px );
     setBoxBorderColors( Q::TextPanel, m_pal.outline );
 
 #ifdef SHOW_FOCUS
@@ -875,11 +878,11 @@ void Editor::setupSpinBox()
     setColor( Q::Text, m_pal.active( P::Text ) );
     setAlignment( Q::Text, Qt::AlignCenter );
 
-    setBoxShape( Q::UpPanel, 0, 2_dp, 0, 0 );
-    setBoxBorderMetrics( Q::UpPanel, 0_dp, 1_dp, 1_dp, 0_dp );
+    setBoxShape( Q::UpPanel, 0, 2_px, 0, 0 );
+    setBoxBorderMetrics( Q::UpPanel, 0_px, 1_px, 1_px, 0_px );
 
-    setBoxShape( Q::DownPanel, 0, 0, 0, 2_dp );
-    setBoxBorderMetrics( Q::DownPanel, 0_dp, 0_dp, 1_dp, 1_dp );
+    setBoxShape( Q::DownPanel, 0, 0, 0, 2_px );
+    setBoxBorderMetrics( Q::DownPanel, 0_px, 0_px, 1_px, 1_px );
 
     for ( auto subControl : { Q::UpPanel, Q::DownPanel } )
     {
@@ -926,16 +929,16 @@ void Editor::setupSwitchButton()
     using Q = QskSwitchButton;
     using P = QPalette;
 
-    const qreal h = 22_dp;
+    const qreal h = 22_px;
     const qreal w = 1.25 * h;
 
-    setBoxShape( Q::Groove, 2_dp );
-    setBoxBorderMetrics( Q::Groove, 1_dp );
+    setBoxShape( Q::Groove, 2_px );
+    setBoxBorderMetrics( Q::Groove, 1_px );
     setStrutSize( Q::Groove | A::Horizontal, 2.0 * w, h );
     setStrutSize( Q::Groove | A::Vertical, h, 2.0 * w );
 
-    setBoxShape( Q::Handle, 2_dp );
-    setBoxBorderMetrics( Q::Handle, 1_dp );
+    setBoxShape( Q::Handle, 2_px );
+    setBoxBorderMetrics( Q::Handle, 1_px );
     setStrutSize( Q::Handle | A::Horizontal, w, h );
     setStrutSize( Q::Handle | A::Vertical, h, w );
 
@@ -982,7 +985,7 @@ void Editor::setupTabButton()
     using A = QskAspect;
     using P = QPalette;
 
-    setStrutSize( Q::Panel, 30_dp, 16_dp );
+    setStrutSize( Q::Panel, 30_px, 16_px );
 
     setColor( Q::Text, m_pal.active( P::Text ) );
     setColor( Q::Text | Q::Disabled, m_pal.disabled( P::Text ) );
@@ -1198,12 +1201,12 @@ void Editor::setupScrollView()
     {
         // The scrollbar is expanding, when being hovered/pressed
 
-        const auto extent = 8_dp;
+        const auto extent = 8_px;
 
         setMetric( subControl | A::Size, extent );
         setBoxShape( subControl, 100, Qt::RelativeSize );
 
-        const qreal padding = extent - 0_dp;
+        const qreal padding = extent - 0_px;
 
         if ( subControl == Q::HorizontalScrollBar )
             setPadding( subControl, 0, padding, 0, 0 );
diff --git a/designsystems/material3/QskMaterial3Skin.cpp b/designsystems/material3/QskMaterial3Skin.cpp
index 74020ffc..117d52cd 100644
--- a/designsystems/material3/QskMaterial3Skin.cpp
+++ b/designsystems/material3/QskMaterial3Skin.cpp
@@ -101,14 +101,47 @@ namespace
 
 namespace
 {
-    Q_DECL_UNUSED inline double operator ""_dp( long double value )
+    inline constexpr qreal dpToPixels( qreal value )
     {
-        return qskDpToPixels( static_cast< qreal >( value ) );
+        /*
+            see: https://en.wikipedia.org/wiki/Device-independent_pixel
+                 https://developer.android.com/training/multiscreen/screendensities
+
+            One dp is a virtual pixel unit that's roughly equal to one pixel
+            on a medium-density screen ( 160 dpi ).
+
+            One logical pixel is equivalent to 1/96th of an inch.
+         */
+
+        /*
+           For non scalable resources the following density buckets
+           are recommended:
+
+                  ldpi: ( 0 -> 140 )  : 120
+                  mdpi: ( 140 -> 200 ): 160
+                  hdpi: ( 140 -> 280 ): 240
+                 xhdpi: ( 280 -> 400 ): 320
+                xxhdpi: ( 400 -> 560 ): 480
+               xxxhdpi: ( 560 -> ... ): 640
+
+           For some reason the metrics from the Figma model seem to be
+           too small on our deskop system. Until this has bee understood
+           we use the ldpi bucket as the density of the logical coordinate
+           system falls into it.
+
+           Need to find out why TODO ...
+         */
+        return value * 96.0 / 120.0;
     }
 
-    Q_DECL_UNUSED inline double operator ""_dp( unsigned long long value )
+    Q_DECL_UNUSED inline constexpr double operator ""_dp( long double value )
     {
-        return qskDpToPixels( value );
+        return dpToPixels( static_cast< qreal >( value ) );
+    }
+
+    Q_DECL_UNUSED inline constexpr double operator ""_dp( unsigned long long value )
+    {
+        return dpToPixels( value );
     }
 
     class Combination : public QskStateCombination
@@ -1569,16 +1602,11 @@ QskMaterial3Skin::~QskMaterial3Skin()
 {
 }
 
-static inline QFont createFont( int pointSize, int lineHeight,
+static inline QFont createFont( qreal size, int lineHeight,
     qreal spacing, QFont::Weight weight )
 {
     Q_UNUSED( lineHeight );
 
-    // convert to px according to https://www.w3.org/TR/css3-values/#absolute-lengths :
-    const double pxSize = pointSize / 72.0 * 96.0;
-
-    const int pixelSize = qRound( qskDpToPixels( pxSize ) );
-
     QFont font( QStringLiteral( "Roboto" ), -1, weight );
 
     static bool checkFont = true;
@@ -1593,7 +1621,8 @@ static inline QFont createFont( int pointSize, int lineHeight,
         checkFont = false;
     }
 
-    font.setPixelSize( pixelSize );
+    // px: 1/96 inch, pt: 1/72 inch
+    font.setPointSize( size * 72.0 / 96.0 );
 
     if ( spacing > 0.0 )
         font.setLetterSpacing( QFont::AbsoluteSpacing, spacing );
@@ -1603,30 +1632,35 @@ static inline QFont createFont( int pointSize, int lineHeight,
 
 void QskMaterial3Skin::setupFonts()
 {
-    setFont( LabelSmall, createFont( 11, 16, 0.5, QFont::Medium ) );
-    setFont( LabelMedium, createFont( 12, 16, 0.5, QFont::Medium ) );
-    setFont( LabelLarge, createFont( 14, 20, 0.1, QFont::Medium ) );
+    /*
+        Not sure what units are used for the font sizes in the specs.
+        From the results on our desktop system we guess they are in pt
+        - corresponding to the QFont point size.
+     */
+    setFont( LabelSmall, createFont( 11, 16_dp, 0.5, QFont::Medium ) );
+    setFont( LabelMedium, createFont( 12, 16_dp, 0.5, QFont::Medium ) );
+    setFont( LabelLarge, createFont( 14, 20_dp, 0.1, QFont::Medium ) );
 
-    setFont( BodySmall, createFont( 12, 16, 0.4, QFont::Normal ) );
-    setFont( BodyMedium, createFont( 14, 20, 0.25, QFont::Normal ) );
-    setFont( BodyLarge, createFont( 16, 24, 0.5, QFont::Normal ) );
+    setFont( BodySmall, createFont( 12, 16_dp, 0.4, QFont::Normal ) );
+    setFont( BodyMedium, createFont( 14, 20_dp, 0.25, QFont::Normal ) );
+    setFont( BodyLarge, createFont( 16, 24_dp, 0.5, QFont::Normal ) );
 
-    setFont( TitleSmall, createFont( 14, 20, 0.1, QFont::Medium ) );
-    setFont( TitleMedium, createFont( 16, 24, 0.15, QFont::Medium ) );
-    setFont( TitleLarge, createFont( 22, 28, 0.0, QFont::Normal ) );
+    setFont( TitleSmall, createFont( 14, 20_dp, 0.1, QFont::Medium ) );
+    setFont( TitleMedium, createFont( 16, 24_dp, 0.15, QFont::Medium ) );
+    setFont( TitleLarge, createFont( 22, 28_dp, 0.0, QFont::Normal ) );
 
-    setFont( HeadlineSmall, createFont( 24, 32, 0.0, QFont::Normal ) );
-    setFont( HeadlineMedium, createFont( 28, 36, 0.0, QFont::Medium ) );
-    setFont( HeadlineLarge, createFont( 32, 40, 0.0, QFont::Medium ) );
+    setFont( HeadlineSmall, createFont( 24, 32_dp, 0.0, QFont::Normal ) );
+    setFont( HeadlineMedium, createFont( 28, 36_dp, 0.0, QFont::Medium ) );
+    setFont( HeadlineLarge, createFont( 32, 40_dp, 0.0, QFont::Medium ) );
 
-    setFont( DisplaySmall, createFont( 36, 44, 0.0, QFont::Normal ) );
-    setFont( DisplayMedium, createFont( 45, 52, 0.0, QFont::Normal ) );
-    setFont( DisplayLarge, createFont( 57, 64, 0.0, QFont::Normal ) );
+    setFont( DisplaySmall, createFont( 36, 44_dp, 0.0, QFont::Normal ) );
+    setFont( DisplayMedium, createFont( 45, 52_dp, 0.0, QFont::Normal ) );
+    setFont( DisplayLarge, createFont( 57, 64_dp, 0.0, QFont::Normal ) );
 
     // to have something for the unused roles
 
     setFont( { QskFontRole::Subtitle, QskFontRole::Normal },
-        createFont( 16, 24, 0.0, QFont::Normal ) );
+        createFont( 16, 24_dp, 0.0, QFont::Normal ) );
 
     QskSkin::completeFontTable();
 }
diff --git a/examples/frames/Frame.cpp b/examples/frames/Frame.cpp
index 4c89f3d3..88c11bb7 100644
--- a/examples/frames/Frame.cpp
+++ b/examples/frames/Frame.cpp
@@ -150,7 +150,7 @@ void Frame::updateFrameNode( const QRectF& rect, QskBoxRectangleNode* node )
     const QskBoxBorderColors borderColors( c1, c1, c2, c2 );
     const qreal radius = effectiveRadius( rect, m_radius );
 
-    node->updateBox( rect, radius, m_frameWidth, borderColors, m_color );
+    node->updateBox( window(), rect, radius, m_frameWidth, borderColors, m_color );
 }
 
 #include "moc_Frame.cpp"
diff --git a/examples/gallery/button/ButtonPage.cpp b/examples/gallery/button/ButtonPage.cpp
index bc00b4d1..d1658a31 100644
--- a/examples/gallery/button/ButtonPage.cpp
+++ b/examples/gallery/button/ButtonPage.cpp
@@ -133,24 +133,18 @@ namespace
         SwitchButtonBox( QQuickItem* parent = nullptr )
             : ButtonBox( Qt::Horizontal, parent )
         {
-            setDimension( 6 );
+            setDimension( 2 );
             setSpacing( 20 );
             setDefaultAlignment( Qt::AlignCenter );
 
             for ( auto orientation : { Qt::Vertical, Qt::Horizontal } )
             {
-                using Q = QskSwitchButton;
+                auto button = new QskSwitchButton( orientation, this );
+                button->setIconMode( QskSwitchButton::ShowIconAlways );
 
-                for( auto iconMode : { Q::NoIcon, Q::ShowIconWhenSelected, Q::ShowIconAlways } )
-                {
-                    auto button = new QskSwitchButton( orientation, this );
-                    button->setIconMode( iconMode );
-
-                    auto invertedButton = new QskSwitchButton( orientation, this );
-                    invertedButton->setInverted( true );
-                    invertedButton->setChecked( true );
-                    invertedButton->setIconMode( iconMode );
-                }
+                auto invertedButton = new QskSwitchButton( orientation, this );
+                invertedButton->setInverted( true );
+                invertedButton->setChecked( true );
             }
         }
     };
diff --git a/examples/iotdashboard/DiagramSkinlet.cpp b/examples/iotdashboard/DiagramSkinlet.cpp
index 5e2ab79f..4287bcf1 100644
--- a/examples/iotdashboard/DiagramSkinlet.cpp
+++ b/examples/iotdashboard/DiagramSkinlet.cpp
@@ -173,7 +173,7 @@ QSGNode* DiagramSkinlet::updateChartNode( const Diagram* diagram, QSGNode* node
                         color = diagram->color( barSubcontrol );
 
                         const auto shape = diagram->boxShapeHint( barSubcontrol );
-                        barNode->updateFilling( barRect, shape, color );
+                        barNode->updateFilling( diagram->window(), barRect, shape, color );
                     }
                 }
                 else
diff --git a/playground/dials/Skin.cpp b/playground/dials/Skin.cpp
index 760c927e..25e3f381 100644
--- a/playground/dials/Skin.cpp
+++ b/playground/dials/Skin.cpp
@@ -11,14 +11,11 @@
 #include <QskTextLabel.h>
 #include <QskSkinHintTableEditor.h>
 #include <QskRgbValue.h>
-#include <QskPlatform.h>
 #include <QskFontRole.h>
 
 static inline QFont qskFont( qreal pointSize )
 {
-    QFont font( "Roboto" );
-    font.setPointSizeF( pointSize / qskDpToPixels( 1.0 ) );
-    return font;
+    return QFont( "Roboto", pointSize );
 }
 
 Skin::Skin()
@@ -31,9 +28,8 @@ void Skin::initHints()
 {
     using namespace QskRgb;
 
-    setFont( QskFontRole::Caption, qskFont( 8 ) );
-    setFont( QskFontRole::Body, qskFont( 13 ) );
-    setFont( QskFontRole::Title, qskFont( 20 ) );
+    setFont( QskFontRole::Caption, qskFont( 12 ) );
+    setFont( QskFontRole::Body, qskFont( 16 ) );
 
     const auto rgb1 = qRgb( 1, 16, 27 ); // Maastricht blue
     const auto rgb2 = qRgb( 255, 0, 22 ); // Ruddy
diff --git a/playground/gradients/GradientView.cpp b/playground/gradients/GradientView.cpp
index 78d90fed..2804cbbe 100644
--- a/playground/gradients/GradientView.cpp
+++ b/playground/gradients/GradientView.cpp
@@ -166,7 +166,7 @@ QSGNode* GradientView::updatePaintNode(
         {
             auto node = gradientNode< QskBoxRectangleNode >( oldNode );
             node->setHint( QskFillNode::PreferColoredGeometry, false );
-            node->updateFilling( rect, shape, m_gradient );
+            node->updateFilling( window(), rect, shape, m_gradient );
 
             return node;
         }
@@ -174,7 +174,7 @@ QSGNode* GradientView::updatePaintNode(
         {
             auto node = gradientNode< QskBoxRectangleNode >( oldNode );
             node->setHint( QskFillNode::PreferColoredGeometry, true );
-            node->updateFilling( rect, shape, m_gradient );
+            node->updateFilling( window(), rect, shape, m_gradient );
 
             return node;
         }
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 151ed18f..0c8fa825 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -111,7 +111,6 @@ list(APPEND HEADERS
     nodes/QskBoxMetrics.h
     nodes/QskBoxBasicStroker.h
     nodes/QskBoxGradientStroker.h
-    nodes/QskBoxColorMap.h
     nodes/QskBoxShadowNode.h
     nodes/QskColorRamp.h
     nodes/QskFillNode.h
@@ -133,6 +132,7 @@ list(APPEND HEADERS
     nodes/QskTextRenderer.h
     nodes/QskTextureRenderer.h
     nodes/QskVertex.h
+    nodes/QskVertexHelper.h
 )
 
 list(APPEND PRIVATE_HEADERS
diff --git a/src/common/QskPlatform.cpp b/src/common/QskPlatform.cpp
index 10fdc86f..935d8452 100644
--- a/src/common/QskPlatform.cpp
+++ b/src/common/QskPlatform.cpp
@@ -6,6 +6,7 @@
 #include "QskPlatform.h"
 
 #include <qguiapplication.h>
+#include <qquickwindow.h>
 #include <qscreen.h>
 
 QSK_QT_PRIVATE_BEGIN
@@ -51,40 +52,24 @@ QRect qskPlatformScreenGeometry( const QScreen* screen )
     return screen->handle()->geometry();
 }
 
-static inline qreal qskRoundedDpi( qreal dpi )
-{   
-    // see https://developer.android.com/training/multiscreen/screendensities
-    
-    if( dpi <= 140.0 )
-        return 120.0; // ldpi
-    
-    if( dpi <= 200.0 )
-        return 160.0; // mdpi
-    
-    if( dpi <= 280.0 )
-        return 240.0; // hdpi
-    
-    if( dpi <= 400.0 )
-        return 320.0; // xhdpi
-    
-    if( dpi <= 560.0 )
-        return 480.0; // xxhdpi
-    
-    return 640.0; // xxxhdpi
-}   
-
-qreal qskDpToPixelsFactor()
+static inline qreal qskWindowDpi( const QWindow* window )
 {
-    if ( const auto screen = QGuiApplication::primaryScreen() )
-        return qskRoundedDpi( screen->physicalDotsPerInch() ) / 160.0;
+    QScreen* screen = nullptr;
+    if ( window )
+        screen = window->screen();
 
-    return 1.0;
+    if ( screen == nullptr )
+        screen = QGuiApplication::primaryScreen();
+
+    return QHighDpiScaling::logicalDpi( screen ).first;
 }
 
-qreal qskPxToPixelsFactor()
+qreal qskInchesToPixels( const QQuickWindow* window, qreal inches )
 {
-    if ( const auto screen = QGuiApplication::primaryScreen() )
-        return screen->physicalDotsPerInch() / 96.0;
-
-    return 1.0;
+    return qskWindowDpi( window ) * inches;
+}
+
+qreal qskMMToPixels( const QQuickWindow* window, qreal mm )
+{
+    return qskWindowDpi( window ) * mm / 25.4;
 }
diff --git a/src/common/QskPlatform.h b/src/common/QskPlatform.h
index e5c9fa83..0381b626 100644
--- a/src/common/QskPlatform.h
+++ b/src/common/QskPlatform.h
@@ -12,6 +12,7 @@ class QScreen;
 class QPlatformIntegration;
 class QPlatformTheme;
 class QRect;
+class QQuickWindow;
 
 QSK_EXPORT qreal qskGlobalScaleFactor();
 
@@ -21,36 +22,7 @@ QSK_EXPORT QRect qskPlatformScreenGeometry( const QScreen* );
 QSK_EXPORT const QPlatformIntegration* qskPlatformIntegration();
 QSK_EXPORT const QPlatformTheme* qskPlatformTheme();
 
-/*
-    see: https://en.wikipedia.org/wiki/Device-independent_pixel
-
-    One dp is a virtual pixel unit that's roughly equal to one pixel
-    on a medium-density screen ( 160 dpi ). 
-
-    One px is equivalent to 1/96th of an inch.
- */
-
-QSK_EXPORT qreal qskDpToPixelsFactor();
-QSK_EXPORT qreal qskPxToPixelsFactor();
-
-inline qreal qskDpToPixels( qreal value )
-{
-    static qreal factor = -1.0;
-
-    if ( factor < 0.0 )
-        factor = qskDpToPixelsFactor();
-
-    return value * factor;
-}
-
-inline qreal qskPxToPixels( qreal value )
-{
-    static qreal factor = -1.0;
-
-    if ( factor < 0.0 )
-        factor = qskPxToPixelsFactor();
-
-    return value * factor;
-}
+QSK_EXPORT qreal qskInchesToPixels( const QQuickWindow*, qreal mm );
+QSK_EXPORT qreal qskMMToPixels( const QQuickWindow*, qreal mm );
 
 #endif
diff --git a/src/controls/QskSkin.cpp b/src/controls/QskSkin.cpp
index 61af02a0..76f37577 100644
--- a/src/controls/QskSkin.cpp
+++ b/src/controls/QskSkin.cpp
@@ -306,30 +306,24 @@ void QskSkin::declareSkinlet( const QMetaObject* metaObject,
 }
 
 static inline void qskSetFont( QskSkin* skin,
-    QskFontRole::Category category, QskFontRole::Emphasis emphasis,  
-    QFont font, QFont::Weight weight )
+    QskFontRole::Category category, QFont font, qreal pointSize )
 {
-    font.setWeight( weight );
-    skin->setFont( { category, emphasis }, font );
-}
-
-static inline void qskSetNormalFont( QskSkin* skin,
-    QskFontRole::Category category, QFont font, int pixelSize )
-{
-    font.setPixelSize( qRound( qskDpToPixels( pixelSize ) ) );
-    qskSetFont( skin, category, QskFontRole::Normal, font, QFont::Normal );
+    font.setPointSize( pointSize );
+    skin->setFont( { category, QskFontRole::Normal }, font );
 }
 
 void QskSkin::setupFontTable( const QString& family, bool italic )
 {
-    const QFont font( family, -1, -1, italic );
+    QFont font( family );
+    font.setItalic( italic );
+    font.setWeight( QFont::Normal );
 
-    qskSetNormalFont( this, QskFontRole::Caption, font, 10 );
-    qskSetNormalFont( this, QskFontRole::Subtitle, font, 15 );
-    qskSetNormalFont( this, QskFontRole::Body, font, 20 );
-    qskSetNormalFont( this, QskFontRole::Title, font, 24 );
-    qskSetNormalFont( this, QskFontRole::Headline, font, 32 );
-    qskSetNormalFont( this, QskFontRole::Display, font, 66 );
+    qskSetFont( this, QskFontRole::Caption, font, 8 );
+    qskSetFont( this, QskFontRole::Subtitle, font, 10 );
+    qskSetFont( this, QskFontRole::Body, font, 12 );
+    qskSetFont( this, QskFontRole::Title, font, 20 );
+    qskSetFont( this, QskFontRole::Headline, font, 30 );
+    qskSetFont( this, QskFontRole::Display, font, 48 );
 
     completeFontTable();
 }
diff --git a/src/controls/QskSkinlet.cpp b/src/controls/QskSkinlet.cpp
index 7befc837..33a9661f 100644
--- a/src/controls/QskSkinlet.cpp
+++ b/src/controls/QskSkinlet.cpp
@@ -196,26 +196,37 @@ static inline QskTextColors qskTextColors(
     return c;
 }
 
+static inline QQuickWindow* qskWindowOfSkinnable( const QskSkinnable* skinnable )
+{
+    if ( auto item = skinnable->owningItem() )
+        return item->window();
+
+    return nullptr;
+}
+
 static inline QSGNode* qskUpdateBoxNode(
-    const QskSkinnable*, QSGNode* node, const QRectF& rect,
+    const QskSkinnable* skinnable, QSGNode* node, const QRectF& rect,
     const QskBoxShapeMetrics& shape, const QskBoxBorderMetrics& borderMetrics,
     const QskBoxBorderColors& borderColors, const QskGradient& gradient,
     const QskShadowMetrics& shadowMetrics, const QColor& shadowColor )
 {
-    if ( rect.isEmpty() )
-        return nullptr;
-
-    if ( !qskIsBoxVisible( borderMetrics, borderColors, gradient )
-        && !qskIsShadowVisible( shadowMetrics, shadowColor ) )
+    if ( !rect.isEmpty() )
     {
-        return nullptr;
+        if ( qskIsBoxVisible( borderMetrics, borderColors, gradient )
+            || qskIsShadowVisible( shadowMetrics, shadowColor ) )
+        {
+            if ( auto window = qskWindowOfSkinnable( skinnable ) )
+            {
+                auto boxNode = QskSGNode::ensureNode< QskBoxNode >( node );
+                boxNode->updateNode( window, rect, shape, borderMetrics,
+                    borderColors, gradient, shadowMetrics, shadowColor );
+
+                return boxNode;
+            }
+        }
     }
 
-    auto boxNode = QskSGNode::ensureNode< QskBoxNode >( node );
-    boxNode->updateNode( rect, shape, borderMetrics,
-        borderColors, gradient, shadowMetrics, shadowColor );
-
-    return boxNode;
+    return nullptr;
 }
 
 static inline QSGNode* qskUpdateArcNode(
@@ -373,7 +384,7 @@ QSGNode* QskSkinlet::updateBackgroundNode(
         return nullptr;
 
     auto rectNode = QskSGNode::ensureNode< QskBoxRectangleNode >( node );
-    rectNode->updateFilling( rect, gradient );
+    rectNode->updateFilling( control->window(), rect, gradient );
 
     return rectNode;
 }
@@ -648,7 +659,8 @@ QSGNode* QskSkinlet::updateBoxClipNode( const QskSkinnable* skinnable,
         auto shape = skinnable->boxShapeHint( subControl );
         shape = shape.toAbsolute( clipRect.size() );
 
-        clipNode->setBox( clipRect, shape, borderMetrics );
+        const auto window = qskWindowOfSkinnable( skinnable );
+        clipNode->setBox( window, clipRect, shape, borderMetrics );
     }
 
     return clipNode;
diff --git a/src/controls/QskSubWindow.cpp b/src/controls/QskSubWindow.cpp
index 5daa8c2b..aae33665 100644
--- a/src/controls/QskSubWindow.cpp
+++ b/src/controls/QskSubWindow.cpp
@@ -5,7 +5,6 @@
 
 #include "QskSubWindow.h"
 #include "QskAspect.h"
-#include "QskPlatform.h"
 #include "QskGraphic.h"
 #include "QskGraphicProvider.h"
 #include "QskTextOptions.h"
@@ -222,10 +221,10 @@ QSizeF QskSubWindow::layoutSizeHint(
     {
         // should be Minimum Width/Height from the skin hints
         if ( hint.width() < 0.0 )
-            hint.setWidth( qskDpToPixels( 100 ) );
+            hint.setWidth( 100 );
 
         if ( hint.height() < 0.0 )
-            hint.setHeight( qskDpToPixels( 80 ) );
+            hint.setHeight( 80 );
     }
 
     return hint;
diff --git a/src/controls/QskSubWindowArea.cpp b/src/controls/QskSubWindowArea.cpp
index 5e7db643..dc632894 100644
--- a/src/controls/QskSubWindowArea.cpp
+++ b/src/controls/QskSubWindowArea.cpp
@@ -24,9 +24,10 @@ static void qskUpdateEventFilter( QskSubWindowArea* area )
     }
 }
 
-static Qt::Edges qskSelectedEdges( const QRectF& rect, const QPointF& pos )
+static Qt::Edges qskSelectedEdges( const QskSubWindowArea* area,
+     const QRectF& rect, const QPointF& pos )
 {
-    const qreal tolerance = qskDpToPixels( 10.0 );
+    const qreal tolerance = qskMMToPixels( area->window(), 3 );
 
     Qt::Edges edges;
     if ( pos.x() <= rect.left() + tolerance )
@@ -222,7 +223,7 @@ bool QskSubWindowArea::mouseEventFilter( QskSubWindow* window, const QMouseEvent
             if ( doDrag )
             {
                 m_data->isDragging = true;
-                m_data->draggedEdges = qskSelectedEdges( cr, mousePos );
+                m_data->draggedEdges = qskSelectedEdges( this,  cr, mousePos );
                 m_data->mousePos = qskMouseScenePosition( event );
 
                 setDragging( window, true );
diff --git a/src/controls/QskSwipeView.cpp b/src/controls/QskSwipeView.cpp
index a1e94a09..a25cffdb 100644
--- a/src/controls/QskSwipeView.cpp
+++ b/src/controls/QskSwipeView.cpp
@@ -74,7 +74,7 @@ void QskSwipeView::setSwipeDistance( int distance )
 
 void QskSwipeView::resetSwipeDistance()
 {
-    setSwipeDistance( qRound( qskDpToPixels( 40 ) ) );
+    setSwipeDistance( qRound( qskMMToPixels( window(), 8 ) ) );
 }
 
 int QskSwipeView::duration() const
diff --git a/src/dialogs/QskDialogSubWindow.cpp b/src/dialogs/QskDialogSubWindow.cpp
index 3cde7a12..765c805e 100644
--- a/src/dialogs/QskDialogSubWindow.cpp
+++ b/src/dialogs/QskDialogSubWindow.cpp
@@ -10,10 +10,6 @@
 #include "QskLinearBox.h"
 #include "QskQuick.h"
 #include "QskEvent.h"
-#if 1
-#include "QskSkin.h"
-#include <QskPlatform.h>
-#endif
 
 #include <qquickwindow.h>
 #include <qpointer.h>
@@ -394,7 +390,7 @@ QSizeF QskDialogSubWindow::layoutSizeHint(
 
     if ( which == Qt::MinimumSize )
     {
-        const auto w = qMax( qskDpToPixels( 300.0 ), size.width() );
+        const auto w = qMax( 300.0, size.width() );
         size.setWidth( w );
     }
 
diff --git a/src/nodes/QskArcRenderer.cpp b/src/nodes/QskArcRenderer.cpp
index 02e843f9..72f64440 100644
--- a/src/nodes/QskArcRenderer.cpp
+++ b/src/nodes/QskArcRenderer.cpp
@@ -7,7 +7,7 @@
 #include "QskArcMetrics.h"
 #include "QskGradient.h"
 #include "QskVertex.h"
-#include "QskBoxColorMap.h"
+#include "QskVertexHelper.h"
 #include "QskRgbValue.h"
 
 #include <qsggeometry.h>
@@ -359,7 +359,7 @@ namespace
     void Renderer::renderLines( const LineStroker& lineStroker,
         Line* fillLines, Line* borderLines ) const
     {
-        QskBoxRenderer::GradientIterator it;
+        QskVertex::GradientIterator it;
 
         if ( fillLines )
         {
diff --git a/src/nodes/QskBoxBasicStroker.cpp b/src/nodes/QskBoxBasicStroker.cpp
index b893428a..0221e3b9 100644
--- a/src/nodes/QskBoxBasicStroker.cpp
+++ b/src/nodes/QskBoxBasicStroker.cpp
@@ -4,7 +4,6 @@
  *****************************************************************************/
 
 #include "QskBoxBasicStroker.h"
-#include "QskBoxColorMap.h"
 
 namespace
 {
@@ -144,7 +143,7 @@ namespace
     {
       public:
         inline FillMap( const QskBoxMetrics& metrics,
-                const QskBoxRenderer::ColorMap& colorMap )
+                const QskVertex::ColorMap& colorMap )
             : m_colorMap( colorMap )
             , m_corners( metrics.corners )
         {
@@ -184,7 +183,7 @@ namespace
             m_colorMap.setLine( x1, y1, x2, y2, line );
         }
 
-        const QskBoxRenderer::ColorMap& m_colorMap;
+        const QskVertex::ColorMap& m_colorMap;
         const QskBoxMetrics::Corner* m_corners;
     };
 }
@@ -379,12 +378,12 @@ QskBoxBasicStroker::QskBoxBasicStroker( const QskBoxMetrics& metrics )
 
 QskBoxBasicStroker::QskBoxBasicStroker( const QskBoxMetrics& metrics,
         const QskBoxBorderColors& borderColors )
-    : QskBoxBasicStroker( metrics, borderColors, QskBoxRenderer::ColorMap() )
+    : QskBoxBasicStroker( metrics, borderColors, QskVertex::ColorMap() )
 {
 }
 
 QskBoxBasicStroker::QskBoxBasicStroker( const QskBoxMetrics& metrics,
-        const QskBoxBorderColors& borderColors, const QskBoxRenderer::ColorMap& colorMap )
+        const QskBoxBorderColors& borderColors, const QskVertex::ColorMap& colorMap )
     : m_metrics( metrics )
     , m_borderColors( borderColors )
     , m_colorMap( colorMap )
diff --git a/src/nodes/QskBoxBasicStroker.h b/src/nodes/QskBoxBasicStroker.h
index b43e9fbc..f65713dd 100644
--- a/src/nodes/QskBoxBasicStroker.h
+++ b/src/nodes/QskBoxBasicStroker.h
@@ -8,7 +8,7 @@
 
 #include "QskBoxMetrics.h"
 #include "QskBoxBorderColors.h"
-#include "QskBoxColorMap.h"
+#include "QskVertexHelper.h"
 
 class QskBoxShapeMetrics;
 class QskBoxBorderMetrics;
@@ -25,7 +25,7 @@ class QskBoxBasicStroker
     QskBoxBasicStroker( const QskBoxMetrics& );
     QskBoxBasicStroker( const QskBoxMetrics&, const QskBoxBorderColors& );
     QskBoxBasicStroker( const QskBoxMetrics&,
-        const QskBoxBorderColors&, const QskBoxRenderer::ColorMap& );
+        const QskBoxBorderColors&, const QskVertex::ColorMap& );
 
     int fillCount() const;
     int borderCount() const;
@@ -78,7 +78,7 @@ class QskBoxBasicStroker
 
     const QskBoxMetrics& m_metrics;
     const QskBoxBorderColors m_borderColors;
-    const QskBoxRenderer::ColorMap m_colorMap;
+    const QskVertex::ColorMap m_colorMap;
     const GeometryLayout m_geometryLayout;
 
     const bool m_isColored;
diff --git a/src/nodes/QskBoxClipNode.cpp b/src/nodes/QskBoxClipNode.cpp
index c04d79e2..1006cb81 100644
--- a/src/nodes/QskBoxClipNode.cpp
+++ b/src/nodes/QskBoxClipNode.cpp
@@ -9,6 +9,8 @@
 #include "QskBoxShapeMetrics.h"
 #include "QskFunctions.h"
 
+#include <qquickitem.h>
+
 static inline QskHashValue qskMetricsHash(
     const QskBoxShapeMetrics& shape, const QskBoxBorderMetrics& border )
 {
@@ -29,7 +31,7 @@ QskBoxClipNode::~QskBoxClipNode()
 {
 }
 
-void QskBoxClipNode::setBox( const QRectF& rect,
+void QskBoxClipNode::setBox( const QQuickWindow* window, const QRectF& rect,
     const QskBoxShapeMetrics& shape, const QskBoxBorderMetrics& border )
 {
     const auto hash = qskMetricsHash( shape, border );
@@ -67,7 +69,9 @@ void QskBoxClipNode::setBox( const QRectF& rect,
     else
     {
         setIsRectangular( false );
-        QskBoxRenderer::setFillLines( rect, shape, border, m_geometry );
+
+        QskBoxRenderer renderer( window );
+        renderer.setFillLines( rect, shape, border, m_geometry );
     }
 
     /*
diff --git a/src/nodes/QskBoxClipNode.h b/src/nodes/QskBoxClipNode.h
index 9312334d..1a637792 100644
--- a/src/nodes/QskBoxClipNode.h
+++ b/src/nodes/QskBoxClipNode.h
@@ -12,13 +12,15 @@
 class QskBoxShapeMetrics;
 class QskBoxBorderMetrics;
 
+class QQuickWindow;
+
 class QSK_EXPORT QskBoxClipNode : public QSGClipNode
 {
   public:
     QskBoxClipNode();
     ~QskBoxClipNode() override;
 
-    void setBox( const QRectF&,
+    void setBox( const QQuickWindow*, const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics& );
 
   private:
diff --git a/src/nodes/QskBoxGradientStroker.cpp b/src/nodes/QskBoxGradientStroker.cpp
index ad2537ca..97c444d9 100644
--- a/src/nodes/QskBoxGradientStroker.cpp
+++ b/src/nodes/QskBoxGradientStroker.cpp
@@ -5,8 +5,7 @@
 
 #include "QskBoxGradientStroker.h"
 #include "QskBoxBasicStroker.h"
-#include "QskVertex.h"
-#include "QskBoxColorMap.h"
+#include "QskVertexHelper.h"
 #include "QskBoxMetrics.h"
 
 static inline bool qskCanUseHVFiller(
@@ -172,7 +171,7 @@ namespace
         qreal m_t0, m_dt;
 
         const QskBoxMetrics::Corner* m_c1, * m_c2, * m_c3;
-        QskBoxRenderer::GradientIterator m_gradientIterator;
+        QskVertex::GradientIterator m_gradientIterator;
     };
 }
 
@@ -528,7 +527,7 @@ namespace
         int setLines( const QskGradient& gradient, ColoredLine* lines )
         {
             ContourIterator it( m_metrics, gradient.linearDirection() );
-            QskBoxRenderer::GradientIterator gradientIt( gradient.stops() );
+            QskVertex::GradientIterator gradientIt( gradient.stops() );
 
             ColoredLine* l = lines;
 
@@ -584,7 +583,7 @@ namespace
             const qreal y1 = m_metrics.innerRect.top();
             const qreal y2 = m_metrics.innerRect.bottom();
 
-            QskBoxRenderer::GradientIterator it( gradient.stops() );
+            QskVertex::GradientIterator it( gradient.stops() );
             ColoredLine* l = lines;
 
             const auto dir = gradient.linearDirection();
diff --git a/src/nodes/QskBoxMetrics.cpp b/src/nodes/QskBoxMetrics.cpp
index a0cf0cff..4972ad3d 100644
--- a/src/nodes/QskBoxMetrics.cpp
+++ b/src/nodes/QskBoxMetrics.cpp
@@ -6,7 +6,7 @@
 #include "QskBoxMetrics.h"
 #include "QskBoxShapeMetrics.h"
 #include "QskBoxBorderMetrics.h"
-#include "QskVertex.h"
+#include "QskVertexHelper.h"
 #include "QskFunctions.h"
 
 QskBoxMetrics::QskBoxMetrics( const QRectF& rect,
diff --git a/src/nodes/QskBoxNode.cpp b/src/nodes/QskBoxNode.cpp
index 22cc78c5..89af944d 100644
--- a/src/nodes/QskBoxNode.cpp
+++ b/src/nodes/QskBoxNode.cpp
@@ -60,7 +60,7 @@ QskBoxNode::~QskBoxNode()
 {
 }
 
-void QskBoxNode::updateNode( const QRectF& rect,
+void QskBoxNode::updateNode( const QQuickWindow* window, const QRectF& rect,
     const QskBoxShapeMetrics& shapeMetrics, const QskBoxBorderMetrics& borderMetrics,
     const QskBoxBorderColors& borderColors, const QskGradient& gradient,
     const QskShadowMetrics& shadowMetrics, const QColor& shadowColor )
@@ -100,7 +100,8 @@ void QskBoxNode::updateNode( const QRectF& rect,
             {
                 // QskBoxRectangleNode allows scene graph batching
                 shadowFillNode = qskNode< QskBoxRectangleNode >( this, ShadowFillRole );
-                shadowFillNode->updateFilling( shadowRect, shadowShape, shadowColor );
+                shadowFillNode->updateFilling( window,
+                    shadowRect, shadowShape, shadowColor );
             }
             else
             {
@@ -125,13 +126,16 @@ void QskBoxNode::updateNode( const QRectF& rect,
 
             if ( fillNode )
             {
-                rectNode->updateBorder( rect, shapeMetrics, borderMetrics, borderColors );
-                fillNode->updateFilling( rect, shapeMetrics, borderMetrics, gradient );
+                rectNode->updateBorder( window, rect,
+                    shapeMetrics, borderMetrics, borderColors );
+
+                fillNode->updateFilling( window, rect,
+                    shapeMetrics, borderMetrics, gradient );
             }
             else
             {
-                rectNode->updateBox( rect, shapeMetrics,
-                    borderMetrics, borderColors, gradient );
+                rectNode->updateBox( window, rect,
+                    shapeMetrics, borderMetrics, borderColors, gradient );
             }
         }
     }
diff --git a/src/nodes/QskBoxNode.h b/src/nodes/QskBoxNode.h
index 999fa58c..8e14d668 100644
--- a/src/nodes/QskBoxNode.h
+++ b/src/nodes/QskBoxNode.h
@@ -15,6 +15,7 @@ class QskBoxBorderMetrics;
 class QskBoxBorderColors;
 class QskGradient;
 class QskShadowMetrics;
+class QQuickWindow;
 class QColor;
 
 class QSK_EXPORT QskBoxNode : public QSGNode
@@ -23,7 +24,7 @@ class QSK_EXPORT QskBoxNode : public QSGNode
     QskBoxNode();
     ~QskBoxNode() override;
 
-    void updateNode( const QRectF&,
+    void updateNode( const QQuickWindow*, const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskBoxBorderColors&, const QskGradient&,
         const QskShadowMetrics&, const QColor& shadowColor );
diff --git a/src/nodes/QskBoxRectangleNode.cpp b/src/nodes/QskBoxRectangleNode.cpp
index 62fcb8c5..ce715e1d 100644
--- a/src/nodes/QskBoxRectangleNode.cpp
+++ b/src/nodes/QskBoxRectangleNode.cpp
@@ -79,21 +79,22 @@ QskBoxRectangleNode::~QskBoxRectangleNode()
 {
 }
 
-void QskBoxRectangleNode::updateFilling(
+void QskBoxRectangleNode::updateFilling( const QQuickWindow* window,
     const QRectF& rect, const QskGradient& gradient )
 {
-    updateFilling( rect, QskBoxShapeMetrics(), QskBoxBorderMetrics(), gradient );
+    updateFilling( window, rect,
+        QskBoxShapeMetrics(), QskBoxBorderMetrics(), gradient );
 }
 
-void QskBoxRectangleNode::updateFilling( const QRectF& rect,
-    const QskBoxShapeMetrics& shape, const QskGradient& gradient )
+void QskBoxRectangleNode::updateFilling( const QQuickWindow* window,
+    const QRectF& rect, const QskBoxShapeMetrics& shape, const QskGradient& gradient )
 {
-    updateFilling( rect, shape, QskBoxBorderMetrics(), gradient );
+    updateFilling( window, rect, shape, QskBoxBorderMetrics(), gradient );
 }
 
-void QskBoxRectangleNode::updateFilling( const QRectF& rect,
-    const QskBoxShapeMetrics& shapeMetrics, const QskBoxBorderMetrics& borderMetrics,
-    const QskGradient& gradient )
+void QskBoxRectangleNode::updateFilling( const QQuickWindow* window,
+    const QRectF& rect, const QskBoxShapeMetrics& shapeMetrics,
+    const QskBoxBorderMetrics& borderMetrics, const QskGradient& gradient )
 {
     Q_D( QskBoxRectangleNode );
 
@@ -117,11 +118,13 @@ void QskBoxRectangleNode::updateFilling( const QRectF& rect,
 
     if ( dirtyGeometry || dirtyMaterial )
     {
+        QskBoxRenderer renderer( window );
+
         if ( coloredGeometry )
         {
             setColoring( QskFillNode::Polychrome );
 
-            QskBoxRenderer::setColoredFillLines( rect, shape,
+            renderer.setColoredFillLines( rect, shape,
                 borderMetrics, fillGradient, *geometry() );
 
             markDirty( QSGNode::DirtyGeometry );
@@ -132,18 +135,16 @@ void QskBoxRectangleNode::updateFilling( const QRectF& rect,
 
             if ( dirtyGeometry )
             {
-                QskBoxRenderer::setFillLines(
-                    rect, shape, borderMetrics, *geometry() );
-
+                renderer.setFillLines( rect, shape, borderMetrics, *geometry() );
                 markDirty( QSGNode::DirtyGeometry );
             }
         }
     }
 }
 
-void QskBoxRectangleNode::updateBorder( const QRectF& rect,
-    const QskBoxShapeMetrics& shapeMetrics, const QskBoxBorderMetrics& borderMetrics,
-    const QskBoxBorderColors& borderColors )
+void QskBoxRectangleNode::updateBorder( const QQuickWindow* window,
+    const QRectF& rect, const QskBoxShapeMetrics& shapeMetrics,
+    const QskBoxBorderMetrics& borderMetrics, const QskBoxBorderColors& borderColors )
 {
     Q_D( QskBoxRectangleNode );
 
@@ -166,11 +167,13 @@ void QskBoxRectangleNode::updateBorder( const QRectF& rect,
 
     if ( dirtyGeometry || dirtyMaterial )
     {
+        QskBoxRenderer renderer( window );
+
         if ( coloredGeometry )
         {
             setColoring( QskFillNode::Polychrome );
 
-            QskBoxRenderer::setColoredBorderLines( rect, shape,
+            renderer.setColoredBorderLines( rect, shape,
                 borderMetrics, borderColors, *geometry() );
 
             markDirty( QSGNode::DirtyGeometry );
@@ -181,7 +184,7 @@ void QskBoxRectangleNode::updateBorder( const QRectF& rect,
 
             if ( dirtyGeometry )
             {
-                QskBoxRenderer::setBorderLines( rect, shape,
+                renderer.setBorderLines( rect, shape,
                     borderMetrics, *geometry() );
 
                 markDirty( QSGNode::DirtyGeometry );
@@ -190,7 +193,7 @@ void QskBoxRectangleNode::updateBorder( const QRectF& rect,
     }
 }
 
-void QskBoxRectangleNode::updateBox( const QRectF& rect,
+void QskBoxRectangleNode::updateBox( const QQuickWindow* window, const QRectF& rect,
     const QskBoxShapeMetrics& shapeMetrics, const QskBoxBorderMetrics& borderMetrics,
     const QskBoxBorderColors& borderColors, const QskGradient& gradient )
 {
@@ -228,7 +231,8 @@ void QskBoxRectangleNode::updateBox( const QRectF& rect,
                 fillGradient.setDirection( QskGradient::Linear );
             }
 
-            QskBoxRenderer::setColoredBorderAndFillLines( rect, shape, borderMetrics,
+            QskBoxRenderer renderer( window );
+            renderer.setColoredBorderAndFillLines( rect, shape, borderMetrics,
                 borderColors, fillGradient, *geometry() );
 
             markDirty( QSGNode::DirtyGeometry );
@@ -236,11 +240,11 @@ void QskBoxRectangleNode::updateBox( const QRectF& rect,
     }
     else if ( hasFill )
     {
-        updateFilling( rect, shapeMetrics, borderMetrics, gradient );
+        updateFilling( window, rect, shapeMetrics, borderMetrics, gradient );
     }
     else if ( hasBorder )
     {
-        updateBorder( rect, shapeMetrics, borderMetrics, borderColors );
+        updateBorder( window, rect, shapeMetrics, borderMetrics, borderColors );
     }
     else
     {
diff --git a/src/nodes/QskBoxRectangleNode.h b/src/nodes/QskBoxRectangleNode.h
index 362f1afe..1446bc3e 100644
--- a/src/nodes/QskBoxRectangleNode.h
+++ b/src/nodes/QskBoxRectangleNode.h
@@ -13,9 +13,10 @@ class QskBoxShapeMetrics;
 class QskBoxBorderMetrics;
 class QskBoxBorderColors;
 class QskGradient;
-
 class QskBoxRectangleNodePrivate;
 
+class QQuickWindow;
+
 class QSK_EXPORT QskBoxRectangleNode : public QskFillNode
 {
     using Inherited = QskFillNode;
@@ -24,21 +25,21 @@ class QSK_EXPORT QskBoxRectangleNode : public QskFillNode
     QskBoxRectangleNode();
     ~QskBoxRectangleNode() override;
 
-    void updateBox( const QRectF&,
+    void updateBox( const QQuickWindow*, const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskBoxBorderColors&, const QskGradient& );
 
-    void updateBorder( const QRectF&,
+    void updateBorder( const QQuickWindow*, const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskBoxBorderColors& );
 
-    void updateFilling( const QRectF& rect, const QskGradient& );
+    void updateFilling( const QQuickWindow*, const QRectF&, const QskGradient& );
 
-    void updateFilling( const QRectF& rect,
+    void updateFilling( const QQuickWindow*, const QRectF&,
         const QskBoxShapeMetrics&, const QskGradient& );
 
-    void updateFilling( const QRectF& rect, const QskBoxShapeMetrics&,
-        const QskBoxBorderMetrics&, const QskGradient& );
+    void updateFilling( const QQuickWindow*, const QRectF&,
+        const QskBoxShapeMetrics&, const QskBoxBorderMetrics&, const QskGradient& );
 
     /*
         If true border/filling can be rendered together into the same geometry.
diff --git a/src/nodes/QskBoxRenderer.cpp b/src/nodes/QskBoxRenderer.cpp
index eadd6693..f5f039fb 100644
--- a/src/nodes/QskBoxRenderer.cpp
+++ b/src/nodes/QskBoxRenderer.cpp
@@ -70,6 +70,15 @@ static inline bool qskMaybeSpreading( const QskGradient& gradient )
     return true;
 }
 
+QskBoxRenderer::QskBoxRenderer( const QQuickWindow* window )
+    : m_window( window )
+{
+}
+
+QskBoxRenderer::~QskBoxRenderer()
+{
+}
+
 bool QskBoxRenderer::isGradientSupported( const QskGradient& gradient )
 {
     if ( !gradient.isVisible() || gradient.isMonochrome() )
@@ -177,7 +186,7 @@ void QskBoxRenderer::setColoredBorderAndFillLines( const QRectF& rect,
     const auto effectiveGradient = qskEffectiveGradient( metrics.innerRect, gradient );
 
     if ( metrics.innerRect.isEmpty() ||
-        QskBoxRenderer::ColorMap::isGradientSupported( effectiveGradient, metrics.innerRect ) )
+        QskVertex::ColorMap::isGradientSupported( effectiveGradient, metrics.innerRect ) )
     {
         /*
             The gradient can be translated to a QskBoxRenderer::ColorMap and we can do all
@@ -193,12 +202,13 @@ void QskBoxRenderer::setColoredBorderAndFillLines( const QRectF& rect,
         const int fillCount = stroker.fillCount();
         const int borderCount = stroker.borderCount();
 
-        auto lines = qskAllocateColoredLines( geometry, borderCount + fillCount );
+        if ( auto lines = qskAllocateColoredLines( geometry, borderCount + fillCount ) )
+        {
+            auto fillLines = fillCount ? lines : nullptr;
+            auto borderLines = borderCount ? lines + fillCount : nullptr;
 
-        auto fillLines = fillCount ? lines : nullptr;
-        auto borderLines = borderCount ? lines + fillCount : nullptr;
-
-        stroker.setBoxLines( borderLines, fillLines );
+            stroker.setBoxLines( borderLines, fillLines );
+        }
     }
     else
     {
@@ -235,14 +245,14 @@ void QskBoxRenderer::setColoredBorderAndFillLines( const QRectF& rect,
 QskGradient QskBoxRenderer::effectiveGradient( const QskGradient& gradient )
 {
     if ( ( gradient.type() == QskGradient::Stops ) || gradient.isMonochrome() )
-    {   
+    {
         // the shader for linear gradients is the fastest
-    
+
         auto g = gradient;
         g.setDirection( QskGradient::Linear );
-    
+
         return g;
     }
-    
+
     return gradient;
 }
diff --git a/src/nodes/QskBoxRenderer.h b/src/nodes/QskBoxRenderer.h
index 9b30eb88..1352ff7c 100644
--- a/src/nodes/QskBoxRenderer.h
+++ b/src/nodes/QskBoxRenderer.h
@@ -13,11 +13,16 @@ class QskBoxBorderColors;
 class QskBoxShapeMetrics;
 class QskGradient;
 
+class QQuickWindow;
 class QSGGeometry;
 class QRectF;
 
-namespace QskBoxRenderer
+class QSK_EXPORT QskBoxRenderer
 {
+  public:
+    QskBoxRenderer( const QQuickWindow* );
+    ~QskBoxRenderer();
+
     /*
         Filling the geometry without any color information:
             see QSGGeometry::defaultAttributes_Point2D()
@@ -26,13 +31,13 @@ namespace QskBoxRenderer
         - using shaders setting the color information
      */
 
-    QSK_EXPORT void setBorderLines( const QRectF&,
+    void setBorderLines( const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&, QSGGeometry& );
 
-    QSK_EXPORT void setFillLines( const QRectF&,
+    void setFillLines( const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&, QSGGeometry& );
 
-    QSK_EXPORT void setFillLines( const QRectF&,
+    void setFillLines( const QRectF&,
         const QskBoxShapeMetrics&, QSGGeometry& );
 
     /*
@@ -41,21 +46,25 @@ namespace QskBoxRenderer
 
         Usually used in combination with QSGVertexColorMaterial
      */
-    QSK_EXPORT bool isGradientSupported( const QskGradient& );
 
-    QSK_EXPORT void setColoredBorderLines( const QRectF&,
+    void setColoredBorderLines( const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskBoxBorderColors&, QSGGeometry& );
 
-    QSK_EXPORT void setColoredFillLines( const QRectF&,
+    void setColoredFillLines( const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskGradient&, QSGGeometry& );
 
-    QSK_EXPORT void setColoredBorderAndFillLines( const QRectF&,
+    void setColoredBorderAndFillLines( const QRectF&,
         const QskBoxShapeMetrics&, const QskBoxBorderMetrics&,
         const QskBoxBorderColors&, const QskGradient&, QSGGeometry& );
 
-    QSK_EXPORT QskGradient effectiveGradient( const QskGradient& );
-}
+    static bool isGradientSupported( const QskGradient& );
+    static QskGradient effectiveGradient( const QskGradient& );
+
+  private:
+    // for adjustments to the target ( f.e devicePixelRatio )
+    const QQuickWindow* m_window;
+};
 
 #endif
diff --git a/src/nodes/QskVertex.h b/src/nodes/QskVertex.h
index 967d2382..e8ec9240 100644
--- a/src/nodes/QskVertex.h
+++ b/src/nodes/QskVertex.h
@@ -11,7 +11,6 @@
 #include <qcolor.h>
 #include <qsggeometry.h>
 #include <qline.h>
-#include <qmath.h>
 
 namespace QskVertex
 {
@@ -216,126 +215,6 @@ namespace QskVertex
     }
 }
 
-namespace QskVertex
-{
-    class ArcIterator
-    {
-      public:
-        inline ArcIterator() = default;
-
-        inline ArcIterator( int stepCount, bool inverted = false )
-        {
-            reset( stepCount, inverted );
-        }
-
-        void reset( int stepCount, bool inverted = false )
-        {
-            m_inverted = inverted;
-
-            if ( inverted )
-            {
-                m_cos = 1.0;
-                m_sin = 0.0;
-            }
-            else
-            {
-                m_cos = 0.0;
-                m_sin = 1.0;
-            }
-
-            m_stepIndex = 0;
-            m_stepCount = stepCount;
-
-            const auto angleStep = M_PI_2 / stepCount;
-            m_cosStep = qFastCos( angleStep );
-            m_sinStep = qFastSin( angleStep );
-        }
-
-        inline bool isInverted() const { return m_inverted; }
-
-        inline qreal cos() const { return m_cos; }
-        inline qreal sin() const { return m_inverted ? -m_sin : m_sin; }
-
-        inline int step() const { return m_stepIndex; }
-        inline int stepCount() const { return m_stepCount; }
-        inline bool isDone() const { return m_stepIndex > m_stepCount; }
-
-        inline void increment()
-        {
-            if ( ++m_stepIndex >= m_stepCount )
-            {
-                if ( m_stepIndex == m_stepCount )
-                {
-                    /*
-                        Doubles are not numerical stable and the small errors,
-                        sum up when iterating in steps. To avoid having to deal with
-                        fuzzy compares we manually fix cos/sin at the end.
-                     */
-                    if ( m_inverted )
-                    {
-                        m_cos = 0.0;
-                        m_sin = -1.0;
-                    }
-                    else
-                    {
-                        m_cos = 1.0;
-                        m_sin = 0.0;
-                    }
-                }
-            }
-            else
-            {
-                const auto cos0 = m_cos;
-
-                m_cos = m_cos * m_cosStep + m_sin * m_sinStep;
-                m_sin = m_sin * m_cosStep - cos0 * m_sinStep;
-            }
-        }
-
-        inline void decrement()
-        {
-            revert();
-            increment();
-            revert();
-        }
-
-        inline void operator++() { increment(); }
-
-        static int segmentHint( qreal radius )
-        {
-            const auto arcLength = radius * M_PI_2;
-            return qBound( 3, qCeil( arcLength / 3.0 ), 18 ); // every 3 pixels
-        }
-
-        inline void revert()
-        {
-            m_inverted = !m_inverted;
-            m_stepIndex = m_stepCount - m_stepIndex;
-
-            m_sin = -m_sin;
-        }
-
-        ArcIterator reverted() const
-        {
-            ArcIterator it = *this;
-            it.revert();
-
-            return it;
-        }
-
-      private:
-        qreal m_cos;
-        qreal m_sin;
-
-        int m_stepIndex;
-        qreal m_cosStep;
-        qreal m_sinStep;
-
-        int m_stepCount;
-        bool m_inverted;
-    };
-}
-
 namespace QskVertex
 {
     void debugGeometry( const QSGGeometry& );
diff --git a/src/nodes/QskBoxColorMap.h b/src/nodes/QskVertexHelper.h
similarity index 63%
rename from src/nodes/QskBoxColorMap.h
rename to src/nodes/QskVertexHelper.h
index 69f04604..742dcf62 100644
--- a/src/nodes/QskBoxColorMap.h
+++ b/src/nodes/QskVertexHelper.h
@@ -3,14 +3,136 @@
  *           SPDX-License-Identifier: BSD-3-Clause
  *****************************************************************************/
 
-#ifndef QSK_BOX_RENDERER_COLOR_MAP_H
-#define QSK_BOX_RENDERER_COLOR_MAP_H
+#ifndef QSK_VERTEX_HELPER_H
+#define QSK_VERTEX_HELPER_H
 
-#include <QskGradient.h>
-#include <QskGradientDirection.h>
-#include <QskVertex.h>
+#include "QskGradient.h"
+#include "QskGradientDirection.h"
+#include "QskVertex.h"
 
-namespace QskBoxRenderer
+#include <qmath.h>
+
+namespace QskVertex
+{
+    class ArcIterator
+    {
+      public:
+        inline ArcIterator() = default;
+
+        inline ArcIterator( int stepCount, bool inverted = false )
+        {
+            reset( stepCount, inverted );
+        }
+
+        void reset( int stepCount, bool inverted = false )
+        {
+            m_inverted = inverted;
+
+            if ( inverted )
+            {
+                m_cos = 1.0;
+                m_sin = 0.0;
+            }
+            else
+            {
+                m_cos = 0.0;
+                m_sin = 1.0;
+            }
+
+            m_stepIndex = 0;
+            m_stepCount = stepCount;
+
+            const auto angleStep = M_PI_2 / stepCount;
+            m_cosStep = qFastCos( angleStep );
+            m_sinStep = qFastSin( angleStep );
+        }
+
+        inline bool isInverted() const { return m_inverted; }
+
+        inline qreal cos() const { return m_cos; }
+        inline qreal sin() const { return m_inverted ? -m_sin : m_sin; }
+
+        inline int step() const { return m_stepIndex; }
+        inline int stepCount() const { return m_stepCount; }
+        inline bool isDone() const { return m_stepIndex > m_stepCount; }
+
+        inline void increment()
+        {
+            if ( ++m_stepIndex >= m_stepCount )
+            {
+                if ( m_stepIndex == m_stepCount )
+                {
+                    /*
+                        Doubles are not numerical stable and the small errors,
+                        sum up when iterating in steps. To avoid having to deal with
+                        fuzzy compares we manually fix cos/sin at the end.
+                     */
+                    if ( m_inverted )
+                    {
+                        m_cos = 0.0;
+                        m_sin = -1.0;
+                    }
+                    else
+                    {
+                        m_cos = 1.0;
+                        m_sin = 0.0;
+                    }
+                }
+            }
+            else
+            {
+                const auto cos0 = m_cos;
+
+                m_cos = m_cos * m_cosStep + m_sin * m_sinStep;
+                m_sin = m_sin * m_cosStep - cos0 * m_sinStep;
+            }
+        }
+
+        inline void decrement()
+        {
+            revert();
+            increment();
+            revert();
+        }
+
+        inline void operator++() { increment(); }
+
+        static int segmentHint( qreal radius )
+        {
+            const auto arcLength = radius * M_PI_2;
+            return qBound( 3, qCeil( arcLength / 3.0 ), 18 ); // every 3 pixels
+        }
+
+        inline void revert()
+        {
+            m_inverted = !m_inverted;
+            m_stepIndex = m_stepCount - m_stepIndex;
+
+            m_sin = -m_sin;
+        }
+
+        ArcIterator reverted() const
+        {
+            ArcIterator it = *this;
+            it.revert();
+
+            return it;
+        }
+
+      private:
+        qreal m_cos;
+        qreal m_sin;
+
+        int m_stepIndex;
+        qreal m_cosStep;
+        qreal m_sinStep;
+
+        int m_stepCount;
+        bool m_inverted;
+    };
+}
+
+namespace QskVertex
 {
     class ColorMap
     {
@@ -101,7 +223,10 @@ namespace QskBoxRenderer
         const QskVertex::Color m_color1;
         const QskVertex::Color m_color2;
     };
+}
 
+namespace QskVertex
+{
     class GradientIterator
     {
       public: