1 files changed, 32 insertions, 3 deletions

diff --git a/src/plugins/platforms/windows/qwindowscursor.cpp b/src/plugins/platforms/windows/qwindowscursor.cpp
index 4dc9af61d8..5b2a3acbae 100644
--- a/src/plugins/platforms/windows/qwindowscursor.cpp
+++ b/src/plugins/platforms/windows/qwindowscursor.cpp
@@ -395,6 +395,19 @@ QWindowsWindowCursor QWindowsCursor::standardWindowCursor(Qt::CursorShape shape)
 }
 
 /*!
+    \brief Return cached pixmap cursor or create new one.
+*/
+
+QWindowsWindowCursor QWindowsCursor::pixmapWindowCursor(const QCursor &c)
+{
+    const qint64 cacheKey = c.pixmap().cacheKey();
+    PixmapCursorCache::iterator it = m_pixmapCursorCache.find(cacheKey);
+    if (it == m_pixmapCursorCache.end())
+        it = m_pixmapCursorCache.insert(cacheKey, QWindowsWindowCursor(c));
+    return it.value();
+}
+
+/*!
     \brief Set a cursor on a window.
 
     This is called frequently as the mouse moves over widgets in the window
@@ -406,11 +419,15 @@ void QWindowsCursor::changeCursor(QCursor *cursorIn, QWindow *window)
 
     if (QWindowsContext::verboseWindows > 1)
         qDebug() << __FUNCTION__ <<  cursorIn << window;
-    if (!cursorIn || !window)
+    if (!window)
+        return;
+    if (!cursorIn) {
+        QWindowsWindow::baseWindowOf(window)->setCursor(QWindowsWindowCursor());
         return;
+    }
     const QWindowsWindowCursor wcursor =
         cursorIn->shape() == Qt::BitmapCursor ?
-        QWindowsWindowCursor(*cursorIn) : standardWindowCursor(cursorIn->shape());
+        pixmapWindowCursor(*cursorIn) : standardWindowCursor(cursorIn->shape());
     if (wcursor.handle()) {
         QWindowsWindow::baseWindowOf(window)->setCursor(wcursor);
     } else {
@@ -449,6 +466,7 @@ void QWindowsCursor::setPos(const QPoint &pos)
 class QWindowsWindowCursorData : public QSharedData
 {
 public:
+    QWindowsWindowCursorData() : m_cursor(Qt::ArrowCursor), m_handle(0) {}
     explicit QWindowsWindowCursorData(const QCursor &c);
     ~QWindowsWindowCursorData();
 
@@ -464,7 +482,13 @@ QWindowsWindowCursorData::QWindowsWindowCursorData(const QCursor &c) :
 
 QWindowsWindowCursorData::~QWindowsWindowCursorData()
 {
-    DestroyCursor(m_handle);
+    if (m_handle)
+        DestroyCursor(m_handle);
+}
+
+QWindowsWindowCursor::QWindowsWindowCursor() :
+    m_data(new QWindowsWindowCursorData)
+{
 }
 
 QWindowsWindowCursor::QWindowsWindowCursor(const QCursor &c) :
@@ -488,6 +512,11 @@ QWindowsWindowCursor & QWindowsWindowCursor::operator =(const QWindowsWindowCurs
     return *this;
 }
 
+bool QWindowsWindowCursor::isNull() const
+{
+    return m_data->m_handle == 0;
+}
+
 QCursor QWindowsWindowCursor::cursor() const
 {
     return m_data->m_cursor;