[Development] iMX6 EGLGS 2D (QtWidgets) painting acceleration

[Denis Shienkov]

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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>>
>>
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>

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