Issues with PixelFormat ?

[guillaume.lachaud]

Hi !

It seems I may encounter issues with the screen of the N950. When I want to display gradients that are drawn in png, I have a lot of ugly stripes. I once had this problem in Android and it had to do with pixel format. Anything like that here ?

Thanks

[gnuton]

Hi,
Of course you can run in the same problem here! What format are you using for your QImage/QPixmap?

[guillaume.lachaud]

Those are 24bits png with alpha channel

[gnuton]

Mobile devices for performance reason use 16bits.
If the image is part of the application you can reduce its color depth on your PC to avoiding undesired glitches.
If you load the picture from the internet then you can convert it by using http://doc.qt.nokia.com/latest/qimag...onvertToFormat on loading.
This will prevent MeeGo graphics to convert it using its algorithms and/or openGL.
To test if OpenGL is the problem, you could run the application using the raster graphics engine which should give better results but it should make your app slower.

[guillaume.lachaud]

And what about symbian devices (I can't test yet) ?

[gnuton]

IIRC Symbian devices use raster graphics system as default one.
So in theory you should not see that problem there.
BTW converting images when you know beforehand that the screen doesn't support such color depth is a waste of resources.
Convert all your images to 16 bit on your PC is the better choice.