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-rw-r--r--src/plugins/platforms/windows/qwindowsbackingstore.cpp7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
index bd5c35037d..135c9eb601 100644
--- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp
+++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
@@ -96,7 +96,12 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
RECT dirty = {dirtyRect.x(), dirtyRect.y(),
dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};
UPDATELAYEREDWINDOWINFO info = {sizeof(info), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA, &dirty};
- QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
+ const BOOL result = QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
+ if (!result)
+ qErrnoWarning("UpdateLayeredWindowIndirect failed for ptDst=(%d, %d),"
+ " size=(%dx%d), dirty=(%dx%d %d, %d)", r.x(), r.y(),
+ r.width(), r.height(), dirtyRect.width(), dirtyRect.height(),
+ dirtyRect.x(), dirtyRect.y());
} else {
QWindowsContext::user32dll.updateLayeredWindow(rw->handle(), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA);
}