Qimage drawing SLOWER on Symbian^3 than S60v5?

[gardiol]

In my app i am displaying raster maps of about 640x640px.

I load them into QImage and then i paint on the screen applying to the QPainter a QTransform with scaling and rotating.

On my old 5800XM it works very fast, i can scale&resize&display at least five of those images with no slowdown (then i fill up the phone memory).

On a new C7 instead even displaying just one is so slow to be unusable...


Is there something special i should be aware of?
Is it due to Symbin^3 using OpenVG instead of Raster?
Can i switch back to raster in my code?
Can i improve this by forcing the image depth of the QImages?

Please, any pointer to find the root of the problem and any hope to fix it...

thanks!

[jhautaka]

You should use QPixmap instead of QImage to get the optimal performance

[kamalakshan]

But using QPixmap you can't get to the pixel data directly for manipulation. And if using QImage it doesn't make use of graphics hardware so one might find it slow.

[gardiol]

Now i try to draw in a QImage then convert to QPixmap and "paint" that. I hope this will speed up since i draw only once, then i need to paint the image to the screeen at each frame!