2 files changed, 16 insertions, 31 deletions

diff --git a/src/plugins/platforms/qnx/qqnxrootwindow.cpp b/src/plugins/platforms/qnx/qqnxrootwindow.cpp
index ff5866d1b7..b3f5c87176 100644
--- a/src/plugins/platforms/qnx/qqnxrootwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxrootwindow.cpp
@@ -188,35 +188,8 @@ void QQnxRootWindow::makeTranslucent()
     int result;
 
     errno = 0;
-    result = screen_destroy_window_buffers(m_window);
-    if (result != 0) {
-        qFatal("QQnxRootWindow: failed to destroy window buffer, errno=%d", errno);
-    }
-
-    QRect geometry = m_screen->geometry();
-    errno = 0;
-    int val[2];
-    val[0] = geometry.width();
-    val[1] = geometry.height();
-    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_BUFFER_SIZE, val);
-    if (result != 0) {
-        qFatal("QQnxRootWindow: failed to set window buffer size, errno=%d", errno);
-    }
-
-    errno = 0;
-    result = screen_create_window_buffers(m_window, 1);
-    if (result != 0) {
-        qFatal("QQNX: failed to create window buffer, errno=%d", errno);
-    }
-
-    // Install an alpha channel on the root window.
-    //
-    // This is necessary in order to avoid interfering with any particular
-    // toplevel widget's QQnxWindow window instance from showing transparent
-    // if it desires.
-    errno = 0;
-    val[0] = SCREEN_TRANSPARENCY_SOURCE_OVER;
-    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_TRANSPARENCY, val);
+    const int val = SCREEN_TRANSPARENCY_DISCARD;
+    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_TRANSPARENCY, &val);
     if (result != 0) {
         qFatal("QQnxRootWindow: failed to set window transparency, errno=%d", errno);
     }
diff --git a/src/plugins/platforms/qnx/qqnxwindow.cpp b/src/plugins/platforms/qnx/qqnxwindow.cpp
index 5aa1c970fd..fb8e8075ad 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxwindow.cpp
@@ -418,15 +418,27 @@ QQnxBuffer &QQnxWindow::renderBuffer()
         // Get all buffers available for rendering
         errno = 0;
         screen_buffer_t buffers[MAX_BUFFER_COUNT];
-        const int result = screen_get_window_property_pv(m_window, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)buffers);
+        int result = screen_get_window_property_pv(m_window, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)buffers);
         if (result != 0)
             qFatal("QQnxWindow: failed to query window buffers, errno=%d", errno);
 
-        // Wrap each buffer
+        // Wrap each buffer and clear
         for (int i = 0; i < MAX_BUFFER_COUNT; ++i) {
             m_buffers[i] = QQnxBuffer(buffers[i]);
+
+            // Clear Buffer
+            errno = 0;
+            int bg[] = { SCREEN_BLIT_COLOR, 0x00000000, SCREEN_BLIT_END };
+            result = screen_fill(m_screen->nativeContext(), buffers[i], bg);
+            if (result != 0)
+                qFatal("QQnxWindow: failed to clear window buffer, errno=%d", errno);
         }
 
+        errno = 0;
+        result = screen_flush_blits(m_screen->nativeContext(), 0);
+        if (result != 0)
+            qFatal("QQnxWindow: failed to flush blits, errno=%d", errno);
+
         // Use the first available render buffer
         m_currentBufferIndex = 0;
         m_previousBufferIndex = -1;