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-rw-r--r--doc/src/platforms/emb-directfb-EmbLinux.qdoc11
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/src/platforms/emb-directfb-EmbLinux.qdoc b/doc/src/platforms/emb-directfb-EmbLinux.qdoc
index 955258e..f416819 100644
--- a/doc/src/platforms/emb-directfb-EmbLinux.qdoc
+++ b/doc/src/platforms/emb-directfb-EmbLinux.qdoc
@@ -153,6 +153,17 @@ manufacturer to manufacture, different operations will be optimized. This
require you to define the operations you want to warn about or disable.
These are listed above in the DIRECTFB_DRAWINGOPERATIONS variable.
+You can also customize this with environment variables.
+
+E.g. If you want to disable fallbacks for drawPixmap and fillRect and also get
+a warning printed on stderr when a fallback would have happened.
+
+\code
+$ export QT_DIRECTFB_WARN_ON_RASTERFALLBACKS="FILL_RECT|DRAW_PIXMAP"
+$ export QT_DIRECTFB_DISABLE_RASTERFALLBACKS="FILL_RECT|DRAW_PIXMAP"
+$ ./app -qws -display directfb
+\endcode
+
Following is a table showing which options you have.
\table