[Qt-qml] hardware acceleration and qml

[mathias.malmqvist at nokia.com]

> I can testify.
> Same animations and transformations done with QML, with OpenGL-enabled 
> QGraphicsView go MUCH FASTER (particularly on Device).

If your application is a full-screen one and you run it with the qmlviewer, then 
make sure you specify the -frameless flag (in addition to the -fullscreen). This 
makes a huge difference to performance when running on N900.


Cheers
Mathias

________________________________________
From: qt-qml-bounces at trolltech.com [qt-qml-bounces at trolltech.com] On Behalf Of ext Ivan De Marino [ivan.de.marino at gmail.com]
Sent: Friday, June 25, 2010 2:17 PM
To: Allison Warwick (Nokia-D-Qt/Brisbane)
Cc: qt-qml at trolltech.com
Subject: Re: [Qt-qml] hardware acceleration and qml

I can testify.
Same animations and transformations done with QML, with OpenGL-enabled QGraphicsView go MUCH FASTER (particularly on Device).
But there are few drawbacks:
- You need to have the entire View redrawn entirely for good quality (but that's ok: you are using OpenGL after all)
- Font Anti-aliasing sucks and gets worse if you apply transformations to the Text

On 23 June 2010 00:52, <warwick.allison at nokia.com<mailto:warwick.allison at nokia.com>> wrote:
> I'd like to know more about the support for hardware acceleration in
> qml. I remember an overview focused on it but in the last snapshot
> documentation I can't find it. Is there a reason? Where I can find the
> supported platforms?

QML builds directly upon QGraphicsView, which in turn builds upon QPainter, which in turn builds upon QPaintEngine (and the internal QGraphicsSystem classes), which have various hardware accelerated implementations.

--
Warwick

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