QNX: Fix flushing the backing store to non-owner windows

Multiple windows can share the same backing store, which we did not
take into account. Don't ignore the window parameter in flush() to fix
that.

Change-Id: I4f98bba34d4da9134163e478cb78cab4ca0358d2
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/plugins/platforms/qnx/qqnxwindow.cpp b/src/plugins/platforms/qnx/qqnxwindow.cpp
index 572dff7289..95604a5e22 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxwindow.cpp
@@ -639,6 +639,19 @@ QQnxWindow *QQnxWindow::findWindow(screen_window_t windowHandle)
     return 0;
 }
 
+void QQnxWindow::blitFrom(QQnxWindow *sourceWindow, const QPoint &sourceOffset, const QRegion &targetRegion)
+{
+    if (!sourceWindow || sourceWindow->m_previousBufferIndex == -1 || targetRegion.isEmpty())
+        return;
+
+    qWindowDebug() << Q_FUNC_INFO << window() << sourceWindow->window() << sourceOffset << targetRegion;
+
+    QQnxBuffer &sourceBuffer = sourceWindow->m_buffers[sourceWindow->m_previousBufferIndex];
+    QQnxBuffer &targetBuffer = renderBuffer();
+
+    blitHelper(sourceBuffer, targetBuffer, sourceOffset, QPoint(0, 0), targetRegion, true);
+}
+
 void QQnxWindow::updateZorder(int &topZorder)
 {
     errno = 0;