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-rw-r--r--doc/src/platforms/emb-directfb-EmbLinux.qdoc8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/src/platforms/emb-directfb-EmbLinux.qdoc b/doc/src/platforms/emb-directfb-EmbLinux.qdoc
index 74f2aaa..9e060f8 100644
--- a/doc/src/platforms/emb-directfb-EmbLinux.qdoc
+++ b/doc/src/platforms/emb-directfb-EmbLinux.qdoc
@@ -267,7 +267,8 @@ perform well.
\o QT_NO_DIRECTFB_IMAGEPROVIDER
\o By default Qt will use DirectFB to load QPixmaps from disk/memory. If
your DirectFB implementation does not support this it might make sense to
-define this.
+define this. If you see strange rendering issues with pixmaps that have an
+alpha channel defining this could solve the problem.
\row
\o QT_DIRECTFB_IMAGEPROVIDER_KEEPALIVE
@@ -327,4 +328,9 @@ QT_DIRECTFB_DISABLE_RASTERFALLBACKS is defined, DirectFB will only return
instead of falling back to QRasterPaintEngine. Please note that these
defines should only be used when optimizing the application.
+\section2 Top level transparency
+\note DirectFB supports partially or fully transparent top level windows,
+either through QWidget::setWindowOpacity or through setting a non-opaque
+background brush. Note that for the latter it is not supported to change an
+opaque window to be transparent at runtime.
*/