Window can have a transparent/translucent color

Change-Id: I1e39b8537dfa00a327b6c735336872cf302c3229
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

diff --git a/src/quick/items/qquickwindow.cpp b/src/quick/items/qquickwindow.cpp
index bf82423..086865a 100644 (file)
--- a/src/quick/items/qquickwindow.cpp
+++ b/src/quick/items/qquickwindow.cpp
@@ -2815,6 +2815,14 @@ void QQuickWindow::setColor(const QColor &color)
     if (color == d->clearColor)
         return;
 
+    if (color.alpha() != d->clearColor.alpha()) {
+        QSurfaceFormat fmt = format();
+        if (color.alpha() < 255)
+            fmt.setAlphaBufferSize(8);
+        else
+            fmt.setAlphaBufferSize(-1);
+        setFormat(fmt);
+    }
     d->clearColor = color;
     emit colorChanged(color);
     d->dirtyItem(contentItem());