1px: 1/96th of an inch

designsystems/fluent2/QskFluent2Skin.cpp

@@ -2035,8 +2035,8 @@ void QskFluent2Skin::initHints()
 
 static inline QFont createFont( int size, int lineHeight, QFont::Weight weight )
 {
-    Q_UNUSED( size ); // ???
-    const int pixelSize = qRound( qskDpToPixels( lineHeight ) );
+    Q_UNUSED( lineHeight ); // ???
+    const int pixelSize = qRound( qskPxToPixels( size ) );
 
     /*
         Font size determines how big or small the letters are, while line height
@@ -2064,7 +2064,6 @@ static inline QFont createFont( int size, int lineHeight, QFont::Weight weight )
         checkFont = false;
     }
 
-    // sp: this is like the dp unit, but it is also scaled by the user's font size preference
     font.setPixelSize( pixelSize );
 
     return font;

src/common/QskPlatform.cpp

@@ -76,10 +76,15 @@ static inline qreal qskRoundedDpi( qreal dpi )
 qreal qskDpToPixelsFactor()
 {
     if ( const auto screen = QGuiApplication::primaryScreen() )
-    {
-        // see: https://en.wikipedia.org/wiki/Device-independent_pixel
         return qskRoundedDpi( screen->physicalDotsPerInch() ) / 160.0;
-    }
+
+    return 1.0;
+}
+
+qreal qskPxToPixelsFactor()
+{
+    if ( const auto screen = QGuiApplication::primaryScreen() )
+        return screen->physicalDotsPerInch() / 96.0;
 
     return 1.0;
 }

src/common/QskPlatform.h

@@ -22,13 +22,16 @@ 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 ). 
 
-    see: https://en.wikipedia.org/wiki/Device-independent_pixel
+    One px is equivalent to 1/96th of an inch.
  */
 
 QSK_EXPORT qreal qskDpToPixelsFactor();
+QSK_EXPORT qreal qskPxToPixelsFactor();
 
 inline qreal qskDpToPixels( qreal value )
 {
@@ -40,4 +43,14 @@ inline qreal qskDpToPixels( qreal value )
     return value * factor;
 }
 
+inline qreal qskPxToPixels( qreal value )
+{
+    static qreal factor = -1.0;
+
+    if ( factor < 0.0 )
+        factor = qskPxToPixelsFactor();
+
+    return value * factor;
+}
+
 #endif