Hi Robin, > Repeating my last answer... > http://lists.qt-project.org/pipermail/development/2016-July/026736.html
I'm sorry, but I did not receive (did not see) your last answer. > I'm going to guess you're using eglfs or something like that Yes, I use EGLFS via X11 on Linux Apalis T30 board, where are used NVIDIA's drivers. Seems, the flickering is when are used: export QT_QPA_EGLFS_FORCE888=1 ENV variable... (I need this variable to smooth the Image's gradients... even X11 started with 24-bit depth). PS: But, I'm not sure about QT_QPA_EGLFS_FORCE888... :( > Using an overlay to debug item positions (QSG_VISUALIZE=overdraw) could be handy for trying to rule this out, as if it is specific to the application, Ok, many thanks, I will try it. 2016-08-04 14:57 GMT+03:00 Robin Burchell <robin...@viroteck.net>: > Repeating my last answer... > > http://lists.qt-project.org/pipermail/development/2016-July/026736.html > > On Thu, Aug 4, 2016, at 01:50 PM, Denis Shienkov wrote: > > {quote} > > > > Hi all. > > > > I have some QML application, where just use QQuickView as QML container. > > This application uses Qt 5.7.x and running on Linux embedded board with > > the > > NVIDIA core (Toradex Apalis T30). > > > > But sometimes I got flickering in process of animation. A flickering > > represents in form of a "white" strips with full-screen width and 1/5-1/6 > > screen heigth. This flickers happens quickly and frequently (every ~20-60 > > seconds, randomly)... > > > > I have seen this "Avoiding graphics flicker in Qt / QML" [1] blog where > > are > > used QML with Qt 4.x, > > where were used this trics: > > > > {code} > > int main(int argc, char **argv) > > { > > ... > > view.setAttribute(Qt::WA_OpaquePaintEvent); > > view.setAttribute(Qt::WA_NoSystemBackground); > > view.viewport()->setAttribute(Qt::WA_OpaquePaintEvent); > > view.viewport()->setAttribute(Qt::WA_NoSystemBackground); > > ... > > } > > {code} > > > > But, in my case I have use Quick v2, with QQuickView instead of > > QDeclarativeView, > > which does not allowed to setup any attributes. > > > > So, my questions is: is there are any way to setup > > Qt::WA_OpaquePaintEvent > > and/or > > Qt::WA_NoSystemBackground in Quck2? Or, maybe is it possible to use > > another > > tricks? > > > > BR, > > Denis > > > > [1] > https://blog.rburchell.com/2011/11/avoiding-graphics-flicker-in-qt-qml.html > > > > {quote} > > > > This flickering present on some HDMI displays... > > > > We currently have this flags: > > > > {code} > > ... > > view.setFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint); > > ... > > {code} > > > > Maybe is it an reasons of flikering? Has someone any ideas? > > > > BR, > > Denis > > _______________________________________________ > > Development mailing list > > Development@qt-project.org > > http://lists.qt-project.org/mailman/listinfo/development >
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