[Qt-interest] paint one image over other continously

[Andre Somers]

Rahulkumar Tibdewal wrote:
> It's not a question of calling update(). Update will simply invoke paint event again. I want my previous image should not get overwritten.
>   
Don't paint the picture directly on the screen, but paint it to an 
internal buffer QImage or QPixMap. If a new image arives, paint it on 
this buffer at the correct coordinates using QPainter::drawImage. Then 
trigger an update to redraw your buffer image to the screen.

André

P.S. I hope you know what you are doing. There are some very nice 
solutions already for this kind of thing. Maybe you can simply integrate 
one of those instead. VNC and NoMachine NX come to mind...