Hi, guys.
Many thanks for your help.
But a problem is that I already have a QtWidgets-based application. And
porting to the QtQuick
+ hacking with custom QuickPlots (or other stuff) will take a lot of time.
Uwe,
what if I try to back-port my application from Qt5 to Qt4 with X11
support (on iMX6).
As I understand, then I do not need to specify the OpenGL Widgets with
Qt4. Is it?
Is it will help? Or do I need to use the QtQuick anyway?
Denis
04.09.2018 12:00, Arno Rehn пишет:
Hi everyone,
because I've hit the same issues on an embedded platform with eglfs
(was the Raspberry Pi, not iMX6), I've thrown together some classes
for native QtQuick/OpenGL plotting. Performance on the Raspberry Pi is
excellent from my experience (5% CPU usage on the R-Pi with a
continuously updated plot).
Repository: https://gitlab.com/qtquickplot/qtquickplot
Blog entry with some explanations:
http://www.arnorehn.de/blog/2014/12/quickplot-a-collection-of-native-qtquick-plot-items/
Regards,
Am 29.08.2018 um 19:49 schrieb Denis Shienkov:
Hi,
> have you tried QOpenGlWidget ?
It does not work together (can't be mixed) with an usual QtWidgets
using the 'eglfs' backend.
> QtCharts to be more QtQuicker and more featured
As I see from the QtCharts sources, it also renders via
QGraphicsScene && QGraphicsWidget even in QtQuick.
29.08.2018 18:56, Vlad Stelmahovsky пишет:
have you tried QOpenGlWidget ?
otherwise you dont have other options: plain QWidget's does not HW
accelerated
or, you can extend QtCharts to be more QtQuicker and more featured.
everyone will be happy :)
On 8/29/18 11:39 AM, Denis Shienkov wrote:
Hi all.
I have an Apalis iMX6 board with the Yocto's image with the working
'eglfs' and 'linuxfb' backends (without of X11 support).
I need to create a 'pure' QtWidgets application, where I need to
use a real-time plotting with the Qwt library (using the Qt Quick
is not an option, as there the QtCharts is not ready for usage) .
But, I'm sadly surprised that a 2D painting takes ~100% CPU loading
as with the 'eglfs' and as with 'linuxfb' backends. It is not an
acceptable, because, e.g. on Desktop Linux/Windows it takes ~4-5%
CPU loading.
Is any workarounds for this? Maybe I need to re-build the Yocto's
image to enable the X11 'xcb' support?
BR,
Denis
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