4 files changed, 55 insertions, 0 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoacursor.h b/src/plugins/platforms/cocoa/qcocoacursor.h
index 58b9ef2151..5b008eff35 100644
--- a/src/plugins/platforms/cocoa/qcocoacursor.h
+++ b/src/plugins/platforms/cocoa/qcocoacursor.h
@@ -56,6 +56,9 @@ public:
     void changeCursor(QCursor *cursor, QWindow *window) override;
     QPoint pos() const override;
     void setPos(const QPoint &position) override;
+
+    QSize size() const override;
+
 private:
     QHash<Qt::CursorShape, NSCursor *> m_cursors;
     NSCursor *convertCursor(QCursor *cursor);
diff --git a/src/plugins/platforms/cocoa/qcocoacursor.mm b/src/plugins/platforms/cocoa/qcocoacursor.mm
index 87a57c78c8..e0d623fc4c 100644
--- a/src/plugins/platforms/cocoa/qcocoacursor.mm
+++ b/src/plugins/platforms/cocoa/qcocoacursor.mm
@@ -85,6 +85,31 @@ void QCocoaCursor::setPos(const QPoint &position)
     CFRelease(e);
 }
 
+
+QSize QCocoaCursor::size() const
+{
+    NSCursor *cocoaCursor = NSCursor.currentSystemCursor;
+    if (!cocoaCursor)
+        return QPlatformCursor::size();
+    NSImage *cursorImage = cocoaCursor.image;
+    if (!cursorImage)
+        return QPlatformCursor::size();
+
+    QSizeF size = QSizeF::fromCGSize(cursorImage.size);
+    NSUserDefaults *defaults = NSUserDefaults.standardUserDefaults;
+    NSDictionary *accessSettings = [defaults persistentDomainForName:@"com.apple.universalaccess"];
+    if (accessSettings == nil)
+        return size.toSize();
+
+    float sizeScale = [accessSettings[@"mouseDriverCursorSize"] floatValue];
+    if (sizeScale > 0) {
+        size.rwidth() *= sizeScale;
+        size.rheight() *= sizeScale;
+    }
+
+    return size.toSize();
+}
+
 NSCursor *QCocoaCursor::convertCursor(QCursor *cursor)
 {
     if (!cursor)
diff --git a/src/plugins/platforms/windows/qwindowscursor.cpp b/src/plugins/platforms/windows/qwindowscursor.cpp
index 17e8cffb76..59457f1720 100644
--- a/src/plugins/platforms/windows/qwindowscursor.cpp
+++ b/src/plugins/platforms/windows/qwindowscursor.cpp
@@ -50,6 +50,7 @@
 #include <QtGui/qscreen.h>
 #include <QtGui/private/qguiapplication_p.h> // getPixmapCursor()
 #include <QtGui/private/qhighdpiscaling_p.h>
+#include <QtCore/private/qwinregistry_p.h>
 
 #include <QtCore/qdebug.h>
 #include <QtCore/qscopedpointer.h>
@@ -686,6 +687,30 @@ void QWindowsCursor::setPos(const QPoint &pos)
     SetCursorPos(pos.x() , pos.y());
 }
 
+/*
+    The standard size is 32x32, even though the cursor is actually just
+    16 pixels large. If a large cursor is set in the accessibility settings,
+    then the cursor increases with 8 pixels for each step.
+*/
+QSize QWindowsCursor::size() const
+{
+    const QPair<DWORD,bool> cursorSizeSetting =
+        QWinRegistryKey(HKEY_CURRENT_USER, LR"(Control Panel\Cursors)")
+                       .dwordValue(L"CursorBaseSize");
+    const int baseSize = screenCursorSize(m_screen).width() / 2;
+    if (!cursorSizeSetting.second)
+        return QSize(baseSize / 2, baseSize / 2);
+
+    // The registry values are dpi-independent, so we need to scale the result.
+    int cursorSizeValue = cursorSizeSetting.first * m_screen->logicalDpi().first
+                                                  / m_screen->logicalBaseDpi().first;
+
+    // map from registry value 32-256 to 0-14, and from there to pixels
+    cursorSizeValue = (cursorSizeValue - 2 * baseSize) / baseSize;
+    const int cursorSize = baseSize + cursorSizeValue * (baseSize / 2);
+    return QSize(cursorSize, cursorSize);
+}
+
 QPixmap QWindowsCursor::dragDefaultCursor(Qt::DropAction action) const
 {
     switch (action) {
diff --git a/src/plugins/platforms/windows/qwindowscursor.h b/src/plugins/platforms/windows/qwindowscursor.h
index b896f4c7a9..cf3635bd6b 100644
--- a/src/plugins/platforms/windows/qwindowscursor.h
+++ b/src/plugins/platforms/windows/qwindowscursor.h
@@ -113,6 +113,8 @@ public:
     QPoint pos() const override;
     void setPos(const QPoint &pos) override;
 
+    QSize size() const override;
+
     static HCURSOR createPixmapCursor(QPixmap pixmap, const QPoint &hotSpot, qreal scaleFactor = 1);
     static HCURSOR createPixmapCursor(const PixmapCursor &pc, qreal scaleFactor = 1) { return createPixmapCursor(pc.pixmap, pc.hotSpot, scaleFactor); }
     static PixmapCursor customCursor(Qt::CursorShape cursorShape, const QPlatformScreen *screen = nullptr);