9 files changed, 11 insertions, 35 deletions
diff --git a/src/plugins/platforms/android/qandroidplatformscreen.cpp b/src/plugins/platforms/android/qandroidplatformscreen.cpp
index 7dc8bb8080..80757c2135 100644
--- a/src/plugins/platforms/android/qandroidplatformscreen.cpp
+++ b/src/plugins/platforms/android/qandroidplatformscreen.cpp
@@ -401,15 +401,17 @@ void QAndroidPlatformScreen::doRedraw()
         m_dirtyRect = QRect();
 }
 
+static const int androidLogicalDpi = 72;
+
 QDpi QAndroidPlatformScreen::logicalDpi() const
 {
-    qreal lDpi = QtAndroid::scaledDensity() * 72;
+    qreal lDpi = QtAndroid::scaledDensity() * androidLogicalDpi;
     return QDpi(lDpi, lDpi);
 }
 
-qreal QAndroidPlatformScreen::pixelDensity() const
+QDpi QAndroidPlatformScreen::logicalBaseDpi() const
 {
-    return QtAndroid::pixelDensity();
+    return QDpi(androidLogicalDpi, androidLogicalDpi);
 }
 
 Qt::ScreenOrientation QAndroidPlatformScreen::orientation() const
diff --git a/src/plugins/platforms/android/qandroidplatformscreen.h b/src/plugins/platforms/android/qandroidplatformscreen.h
index f15aeae3fd..5dc158e351 100644
--- a/src/plugins/platforms/android/qandroidplatformscreen.h
+++ b/src/plugins/platforms/android/qandroidplatformscreen.h
@@ -103,7 +103,7 @@ protected:
 
 private:
     QDpi logicalDpi() const override;
-    qreal pixelDensity()  const override;
+    QDpi logicalBaseDpi() const override;
     Qt::ScreenOrientation orientation() const override;
     Qt::ScreenOrientation nativeOrientation() const override;
     void surfaceChanged(JNIEnv *env, jobject surface, int w, int h) override;
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.mm b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
index 6015257f4e..15e0236107 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.mm
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.mm
@@ -153,7 +153,7 @@ void QNSWindowBackingStore::flush(QWindow *window, const QRegion &region, const
     // context is set up correctly (coordinate system, clipping, etc). Outside
     // of the normal display cycle there is no focused view, as explained above,
     // so we have to handle it manually. There's also a corner case inside the
-    // normal display cycle due to way QWidgetBackingStore composits native child
+    // normal display cycle due to way QWidgetRepaintManager composits native child
     // widgets, where we'll get a flush of a native child during the drawRect of
     // its parent/ancestor, and the parent/ancestor being the one locked by AppKit.
     // In this case we also need to lock and unlock focus manually.
diff --git a/src/plugins/platforms/cocoa/qcocoascreen.h b/src/plugins/platforms/cocoa/qcocoascreen.h
index 491af2fe9c..60243b79be 100644
--- a/src/plugins/platforms/cocoa/qcocoascreen.h
+++ b/src/plugins/platforms/cocoa/qcocoascreen.h
@@ -68,6 +68,7 @@ public:
     qreal devicePixelRatio() const override { return m_devicePixelRatio; }
     QSizeF physicalSize() const override { return m_physicalSize; }
     QDpi logicalDpi() const override { return m_logicalDpi; }
+    QDpi logicalBaseDpi() const override { return m_logicalDpi; }
     qreal refreshRate() const override { return m_refreshRate; }
     QString name() const override { return m_name; }
     QPlatformCursor *cursor() const override { return m_cursor; }
diff --git a/src/plugins/platforms/qnx/qqnxscreeneventhandler.cpp b/src/plugins/platforms/qnx/qqnxscreeneventhandler.cpp
index 56131dcc48..a9b5860187 100644
--- a/src/plugins/platforms/qnx/qqnxscreeneventhandler.cpp
+++ b/src/plugins/platforms/qnx/qqnxscreeneventhandler.cpp
@@ -636,7 +636,7 @@ void QQnxScreenEventHandler::handleDisplayEvent(screen_event_t event)
         // We never remove the primary display, the qpa plugin doesn't support that and it crashes.
         // To support it, this would be needed:
         // - Adjust all qnx qpa code which uses screens
-        // - Make QWidgetBackingStore not dereference a null paint device
+        // - Make QWidgetRepaintManager not dereference a null paint device
         // - Create platform resources ( QQnxWindow ) for all QWindow because they would be deleted
         //   when you delete the screen
 
diff --git a/src/plugins/platforms/windows/qwindowsscreen.cpp b/src/plugins/platforms/windows/qwindowsscreen.cpp
index 282c0b107e..8cd09a34eb 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.cpp
+++ b/src/plugins/platforms/windows/qwindowsscreen.cpp
@@ -256,15 +256,6 @@ QWindow *QWindowsScreen::windowAt(const QPoint &screenPoint, unsigned flags)
     return result;
 }
 
-qreal QWindowsScreen::pixelDensity() const
-{
-    // QTBUG-49195: Use logical DPI instead of physical DPI to calculate
-    // the pixel density since it is reflects the Windows UI scaling.
-    // High DPI auto scaling should be disabled when the user chooses
-    // small fonts on a High DPI monitor, resulting in lower logical DPI.
-    return qMax(1, qRound(logicalDpi().first / 96));
-}
-
 /*!
     \brief Determine siblings in a virtual desktop system.
 
diff --git a/src/plugins/platforms/windows/qwindowsscreen.h b/src/plugins/platforms/windows/qwindowsscreen.h
index 0ccebf6d71..2fd56f53cf 100644
--- a/src/plugins/platforms/windows/qwindowsscreen.h
+++ b/src/plugins/platforms/windows/qwindowsscreen.h
@@ -87,7 +87,7 @@ public:
     QImage::Format format() const override { return m_data.format; }
     QSizeF physicalSize() const override { return m_data.physicalSizeMM; }
     QDpi logicalDpi() const override { return m_data.dpi; }
-    qreal pixelDensity() const override;
+    QDpi logicalBaseDpi() const override { return QDpi(96, 96); };
     qreal devicePixelRatio() const override { return 1.0; }
     qreal refreshRate() const override { return m_data.refreshRateHz; }
     QString name() const override { return m_data.name; }
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp
index 8c34bd9c91..0fe22bd318 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.cpp
+++ b/src/plugins/platforms/xcb/qxcbscreen.cpp
@@ -660,10 +660,6 @@ QImage::Format QXcbScreen::format() const
 
 int QXcbScreen::forcedDpi() const
 {
-    static const int overrideDpi = qEnvironmentVariableIntValue("QT_FONT_DPI");
-    if (overrideDpi)
-        return overrideDpi;
-
     const int forcedDpi = m_virtualDesktop->forcedDpi();
     if (forcedDpi > 0)
         return forcedDpi;
@@ -679,11 +675,6 @@ QDpi QXcbScreen::logicalDpi() const
     return m_virtualDesktop->dpi();
 }
 
-qreal QXcbScreen::pixelDensity() const
-{
-    return m_pixelDensity;
-}
-
 QPlatformCursor *QXcbScreen::cursor() const
 {
     return m_cursor;
@@ -747,14 +738,6 @@ void QXcbScreen::updateGeometry(const QRect &geometry, uint8_t rotation)
     if (m_sizeMillimeters.isEmpty())
         m_sizeMillimeters = sizeInMillimeters(geometry.size(), m_virtualDesktop->dpi());
 
-    qreal dpi = forcedDpi();
-    if (dpi <= 0)
-        dpi = geometry.width() / physicalSize().width() * qreal(25.4);
-
-    // Use 128 as a reference DPI on small screens. This favors "small UI" over "large UI".
-    qreal referenceDpi = physicalSize().width() <= 320 ? 128 : 96;
-
-    m_pixelDensity = qMax(1, qRound(dpi/referenceDpi));
     m_geometry = geometry;
     m_availableGeometry = geometry & m_virtualDesktop->workArea();
     QWindowSystemInterface::handleScreenGeometryChange(QPlatformScreen::screen(), m_geometry, m_availableGeometry);
diff --git a/src/plugins/platforms/xcb/qxcbscreen.h b/src/plugins/platforms/xcb/qxcbscreen.h
index ec3b07bfb7..62931d2500 100644
--- a/src/plugins/platforms/xcb/qxcbscreen.h
+++ b/src/plugins/platforms/xcb/qxcbscreen.h
@@ -161,7 +161,7 @@ public:
     QImage::Format format() const override;
     QSizeF physicalSize() const override { return m_sizeMillimeters; }
     QDpi logicalDpi() const override;
-    qreal pixelDensity() const override;
+    QDpi logicalBaseDpi() const override { return QDpi(96, 96); };
     QPlatformCursor *cursor() const override;
     qreal refreshRate() const override { return m_refreshRate; }
     Qt::ScreenOrientation orientation() const override { return m_orientation; }
@@ -227,7 +227,6 @@ private:
     Qt::ScreenOrientation m_orientation = Qt::PrimaryOrientation;
     QXcbCursor *m_cursor;
     int m_refreshRate = 60;
-    int m_pixelDensity = 1;
     QEdidParser m_edid;
 };