Double Buffering

["[ A b h i s h e k ]" <septembereleven hotmail com>]

Hi

i was wanting to highlight a portion of an image just by clicking and 
dragging over it. When i drew directly on the image there was a lot of 
flickering. So now i always draw to a offscreen pixmap and then display that 
pixmap. It works nicely and there is no flickering. The problem is that i 
draw and show the pixmap on motion_notify event and hence for large pictures 
like 600 * 400 my system starts to go really slow and it looks awfull.

Could anyone please help me out.
Thanks

Abhishek Samuel

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