Qt-embedded-interest Archive, January 2007
speed QTe 3.3 <-> Qtopia 4.2
Message 1 in thread
Hello,
if I would use Qtopia 4.2 instead of Qte 3.3, would the applications be
slower or faster in general? Or is there no big difference?
Greetings
Ernst
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Message 2 in thread
On Thursday 18 January 2007 21:41, Ernst Murnleitner wrote:
> Hello,
>
> if I would use Qtopia 4.2 instead of Qte 3.3, would the applications be
> slower or faster in general? Or is there no big difference?
The internals of the painting is almost completely redesigned between Qt/E 3
and Qtopia Core 4.x. For instance all top-level widgets are double buffered
per default in 4.x. Whether this makes your application faster or slower
depends on your hardware and the nature of your application. (Double
buffering in main memory for instance usually makes the painting faster if
the painting isn't trivial (compositining in main and then blitting the final
image to the video memory is normally cheaper than doing everything in video
memory).
If you experience performance issues in 4.2, there's usually some tuning
that can be done to speed things up or make Qtopia Core behave more like Qt/E
(show us your colde). We're also working on more optimizations of the
painting system for 4.3. We are not working on improving Qt/E 3.x.
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