Flickering display (using RGB buffer to write on a DrawingArea)

[Bruno Renier <brenier irisa fr>]

Hi!

I'm currently writing an application that needs to redraw a whole 
GtkDrawingArea when new data arrives.
It needs to draw a certain number of boxes based on the incoming data. 
The drawing area is updated maybe 100 times per second.

I'm using a GdkRGB buffer that I update when new data arrives. Then, 
when the drawing is done, I invalidate the whole DrawingArea.
In the DrawingArea's expose-event, I draw it on the DrawingArea's window 
using gdk_draw_rgb_image.
My problem is that there is a lot of flickering.

To reduce that I tried to use a server-side pixmap, that I update using 
the RGB buffer and draw on the DrawingArea's window during the 
expose-event, but that didn't solve my problem (it reduced the time 
needed to update the window during the expose-event though).

I tried with double buffering turned on and off, and I got the same 
results :(

Any ideas on what may cause this flickering and how to solve it?
Am I updating the drawing area too frequently?

Thanks!