On 1 Feb 2009, at 15:14, Jos Dreesen wrote:

>>      Try drawing an fl_rectf() just before your call to fl_bitmap()
>>      using the background color you want.
>
> This works, i get a more or less usable display. But at the  
> expected cost of some flicker.

If you use an Fl_Double_Window as your outer window, you should get  
no (visible) flicker on the display.
If you are using a double-window and still seeing flicker, that might  
be something odd...
-- 
Ian

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