I'm trying to speed the switch from a screen to another one, the hardware is very poor and currently it takes 2/3 second between hide of a widget and show of another one.
I know that by default Qt framework puts an intermediate layer to render the screen, it should save somewhere and then put in the frame buffer:
And I read about direct paint skipping the intermediate layer using a QDirectPaint:
But it's not so clear to me how to use it, I can't find any example but a description of methods.
Basically what I have is a MainScreen for standby, when I touch the screen I have overlap another screen.
Both the screen are QWidget implemented with qt-creator, so with their UI form and so on.
Can anybody suggest me some way to use QDirectPainter?
The widget has a complex layout with stylesheet and transparency