December 18, 2011

bunjee bunjee
Lab Rat
122 posts

Qt 4.8 GraphicsView slower than 4.8 RC

 

Greetings Qt devs,

I’ve Just tested the QGraphicsView on Win32 Vista in software.

There is an important performance hit between 4.8 RC and 4.8.

Animations and transitions seem slower. You can notice that in qtDemo 4.8 and 4.8 RC.

Has the software renderer been tweaked between 4.8 RC and 4.8 ?

Thanks.

7 replies

December 19, 2011

Andre Andre
Robot Herder
6399 posts

Please submit a bugreport via Jira [bugreports.qt.nokia.com]

December 19, 2011

bunjee bunjee
Lab Rat
122 posts

Hello Andre,

Done: https://bugreports.qt.nokia.com/browse/QTBUG-23253

Thanks.

February 19, 2012

qtnext qtnext
Lab Rat
149 posts

it’s fixed ! big thanks to Jonathan Liu
https://bugreports.qt-project.org/browse/QTBUG-23253
https://qt.gitorious.org/qt/qt/commit/1482b41690861e4f31d0b6693fff0f4da2389015

strange that nobody from Qt try to fix this before : it was just making Windows QMl application unusable under Windows !

February 19, 2012

bunjee bunjee
Lab Rat
122 posts

Agree, that was quite a big regession on Windows.

And it’s a one letter fix :D.

Thanks Jonathan.

B.A.

February 19, 2012

Andre Andre
Robot Herder
6399 posts

Glad it got fixed this way!

February 19, 2012

qtnext qtnext
Lab Rat
149 posts

I need to force image to asynchronous:true to the same smooth animation as in Qt 4.7.4 (for example coverflow with HD image)

February 19, 2012

Deleted Member # 269f Deleted Member # 269f
Lab Rat
251 posts

Will this fix (performance drop seems rather significant) be included in the official SDK or available through the SDK maintenance app? Or is it only available through Git and in future releases of the SDK?

 
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