1 files changed, 12 insertions, 10 deletions
diff --git a/src/winextras/qwinthumbnailtoolbar.cpp b/src/winextras/qwinthumbnailtoolbar.cpp
index d7e4ced..f09eb15 100644
--- a/src/winextras/qwinthumbnailtoolbar.cpp
+++ b/src/winextras/qwinthumbnailtoolbar.cpp
@@ -38,6 +38,13 @@
  **
  ****************************************************************************/
 
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < 0x0601
+#  undef _WIN32_WINNT
+#endif
+#if !defined(_WIN32_WINNT)
+#  define _WIN32_WINNT 0x0601 // Enable functions for MinGW
+#endif
+
 #include "qwinthumbnailtoolbar.h"
 #include "qwinthumbnailtoolbar_p.h"
 #include "qwinthumbnailtoolbutton.h"
@@ -228,18 +235,15 @@ int QWinThumbnailToolBar::count() const
 void QWinThumbnailToolBarPrivate::updateIconicPixmapsEnabled(bool invalidate)
 {
     Q_Q(QWinThumbnailToolBar);
-    qtDwmApiDll.init();
     const HWND hwnd = handle();
     if (!hwnd) {
          qWarning() << Q_FUNC_INFO << "invoked with hwnd=0";
          return;
     }
-    if (!qtDwmApiDll.dwmInvalidateIconicBitmaps)
-        return;
     const bool enabled = iconicThumbnail || iconicLivePreview;
     q->setIconicPixmapNotificationsEnabled(enabled);
     if (enabled && invalidate) {
-        const HRESULT hr = qtDwmApiDll.dwmInvalidateIconicBitmaps(hwnd);
+        const HRESULT hr = DwmInvalidateIconicBitmaps(hwnd);
         if (FAILED(hr))
             qWarning() << QWinThumbnailToolBarPrivate::msgComFailed("DwmInvalidateIconicBitmaps", hr);
     }
@@ -385,12 +389,11 @@ QPixmap QWinThumbnailToolBar::iconicLivePreviewPixmap() const
 
 inline void QWinThumbnailToolBarPrivate::updateIconicThumbnail(const MSG *message)
 {
-    qtDwmApiDll.init();
-    if (!qtDwmApiDll.dwmSetIconicThumbnail || !iconicThumbnail)
+    if (!iconicThumbnail)
         return;
     const QSize maxSize(HIWORD(message->lParam), LOWORD(message->lParam));
     if (const HBITMAP bitmap = iconicThumbnail.bitmap(maxSize)) {
-        const HRESULT hr = qtDwmApiDll.dwmSetIconicThumbnail(message->hwnd, bitmap, dWM_SIT_DISPLAYFRAME);
+        const HRESULT hr = DwmSetIconicThumbnail(message->hwnd, bitmap, dWM_SIT_DISPLAYFRAME);
         if (FAILED(hr))
             qWarning() << QWinThumbnailToolBarPrivate::msgComFailed("DwmSetIconicThumbnail", hr);
     }
@@ -398,15 +401,14 @@ inline void QWinThumbnailToolBarPrivate::updateIconicThumbnail(const MSG *messag
 
 inline void QWinThumbnailToolBarPrivate::updateIconicLivePreview(const MSG *message)
 {
-    qtDwmApiDll.init();
-    if (!qtDwmApiDll.dwmSetIconicLivePreviewBitmap || !iconicLivePreview)
+    if (!iconicLivePreview)
         return;
     RECT rect;
     GetClientRect(message->hwnd, &rect);
     const QSize maxSize(rect.right, rect.bottom);
     POINT offset = {0, 0};
     if (const HBITMAP bitmap = iconicLivePreview.bitmap(maxSize)) {
-        const HRESULT hr = qtDwmApiDll.dwmSetIconicLivePreviewBitmap(message->hwnd, bitmap, &offset, dWM_SIT_DISPLAYFRAME);
+        const HRESULT hr = DwmSetIconicLivePreviewBitmap(message->hwnd, bitmap, &offset, dWM_SIT_DISPLAYFRAME);
         if (FAILED(hr))
             qWarning() << QWinThumbnailToolBarPrivate::msgComFailed("DwmSetIconicLivePreviewBitmap", hr);
     }