From be9df4bc82b3f62854906761b7661bc2778b513e Mon Sep 17 00:00:00 2001 From: Friedemann Kleint Date: Mon, 7 Dec 2015 16:33:20 +0100 Subject: QWindowsBackingStore::flush(): Add warning for UpdateLayeredWindowIndirect() failures. Task-number: QTBUG-49785 Change-Id: I881e6d294ae6b23e280e727ee1fc48ee6562f2fe Reviewed-by: Friedemann Kleint --- src/plugins/platforms/windows/qwindowsbackingstore.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'src/plugins/platforms/windows/qwindowsbackingstore.cpp') 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 ®ion, 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); } -- cgit v1.2.3