Hello,
On Mon, 13 Dec 2010 17:15:42 +0100, Thorbj?rn Lindeijer
thorbjorn.lindei...@nokia.com wrote:
> Short answers:
> * Make sure you're using OpenGL when you do any blending, scaling or
> rotating. (-opengl to qmlviewer or QGLWidget as viewport of
> QDeclarativeView)
> * Run fullscreen rather than maximized to avoid compositing overhead.
> (-fullscreen to qmlviewer or use showFullscreen() rather than show())
I am also experiencing performance issues especially for scaling and
rotating. I am sub-classing a QDeclarativeView as the main widget of my
application and I have tried to utilize a QGLWidget as the viewport as
recommended (shown below).
class myView : public QDeclarativeView
{
Q_OBJECT
public:
// major implementation steps in constructor
myView (QWidget *parent = 0) : QDeclarativeView(parent) {
// setup data model
// setup context properties
setViewport(new QGLWidget());
// set main QML source
}
private:
//my data members
private slots:
// my private slots
};
It seems to work fine on Windows using Qt 4.7.0 (I see a slight
difference in the rendering), but the same program does not compile for
Symbian^3 using Qt 4.7.0. I get the following error:
"GL/gl.h: No such file or directory"
This error is due to the file C:\Qt\4.7.0\src\opengl\qgl.h having the
following lines (line 77-79):
# include <GL/gl.h>
# ifndef QT_LINUXBASE
# include <GL/glu.h>
Please advise.
Regards,
Jevon Beckles
Orange Labs
Building 10, Chiswick Park
566 Chiswick High Road
London W4 5XS
tel. +44 208 987 1906
jevon.beck...@orange-ftgroup.com
------------------------------------------------------------------------
---
Message: 3
Date: Mon, 13 Dec 2010 17:15:42 +0100
From: Thorbj?rn Lindeijer <thorbjorn.lindei...@nokia.com>
Subject: Re: [Qt-qml] on device performance
To: qt-qml@trolltech.com
Message-ID: <4d0646ae.2020...@nokia.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Well, Thunderbird ate my reply when I cancelled sending when I noticed
that I was once again replying the author and not the list...
On 12/13/2010 04:59 PM, ext Alexey Zaryanov wrote:
> Hi. I was really surprised when I saw the performance of QML
> applications on the device (n900) ( deckarative demos : twitter, rss
> etc. ). Its only about 12-15 fps. Its not smooth ! Look at any iphone
apps!
> But video on youtube shows me very fast UI. What wrong ?
Short answers:
* Make sure you're using OpenGL when you do any blending, scaling or
rotating. (-opengl to qmlviewer or QGLWidget as viewport of
QDeclarativeView)
* Run fullscreen rather than maximized to avoid compositing overhead.
(-fullscreen to qmlviewer or use showFullscreen() rather than show())
Regards,
Bj?rn
--
Thorbj?rn Lindeijer
Software Engineer
Nokia, Qt Development Frameworks
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