[Interest] qml performance with Qt5.2

[Gunnar Sletta]

On 17 Jun 2014, at 04:14, Nancy Zou <Nancy.Zou at csr.com> wrote:

> Dear All
> I know Qt5.2 have a big performance increase, but I don’t find my qml application have some performance increase compared with Qt5.0.
> I write some of my qml like that:
> ...
> Sometimes I want some item invisible, so I set opacity to 0. But I know visible: false can make item invisible too. Which one should better to choose?

opacity==0 and visible==false are equivalent in terms of graphics. Both will result in the item being removed from the scene graph and not rendered.

> If the opacity is 0, does the item still drawing? I suspect it’s why my qml can’t run good on Qt5.2.
> I want to ask how to write a good qml  file to make full use of Qt5.2 optimization.

http://qt-project.org/doc/qt-5/qtquick-visualcanvas-scenegraph-renderer.html

>  
> Thank you.
> Best Regards
> Nancy
>  
> 
> 
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