screen rendering with default bgcolor

[viji s]

Hi joel,

I have  different gui screens of same size , when I try to make  a transition between different screens based on some event. first the background gets rendered and then the actual screen.  the rendering is too slow. please, help me out with this. 

when, my screen transition happens it must be immediate.

 

please, respond at the earliest.

 

thanks and regards 

[inmarket]

There are previous forum entries on this topic. The issue is the uGFX does not handle overlapping windows optimally due to memory constraints. Instead it redraws conservatively which eventually results in the correct display but may result in multiple drawing passes (as you have seen).

The previous forum posts discuss how to improve this performance using the sysvisible flags when it can be guaranteed there is a complete area overlap.