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Comment by tenfingers | Hacker News Reader

As for GTK3, rendering performance, latency and memory usage in QT5 suffer significantly. QT4 is not light, but QT5 adds overhead for no reason.

I like the general polishing in the core modules, but I have really no use for qtquick. For this reason, I really encourage anyone to get onto copperspice (http://www.copperspice.com/). Without MOC, QT really feels an awesome API.

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While I can't say I've experienced any significant memory usage or latency issues (possibly because I'm targetting recent hardware and working with large volumes of data), I'm completely in the same boat with QtQuick and CopperSpice does look quite interesting, I'll have to check it out.

I use Qt a lot on smaller embedded targets and I haven't moved to 5. Don't really want to mess with the new windowing system and I can't put Wayland/Weston on a lot of my smaller projects.

I'm pretty much locked into 4.8 (and it's eternally open tickets) for life.

> Wayland/Weston on a lot of my smaller projects

Huh? Qt5 doesn't require Wayland; I've used it on X.

Qt5 doesn't require Wayland, I'm using Qt 5.5.1 with widgets on embedded environments (X11 included) without problems.

X11 included

Yeah, um, not possible for me. I use the Linux framebuffer and that's it.

And it does support Linux FrameBuffer.

http://doc.qt.io/qt-5/embedded-linux.html

The thing to note here is that the stripped out the windowing system implementation for embedded machines. So if you're using framebuffer without X11 or Wayland you're on your own for windowing now, which was previously provided in Qt4.

That's my understanding at least, I don't use Qt on embedded platforms though, can anyone confirm this?

That's my understanding as well. I haven't looked deep enough into the QPA stuff to understand it.

I don't work on embedded platforms, but it seems Qt5 supports directfb, which can do windowing.

http://doc.qt.io/qt-5/embedded-linux.html http://stackoverflow.com/a/21489384/331041

Whoa thanks for pointing out copper spice! I use Qt everyday at work and this could be cool to mess around with for some projects.

Yes, MOC and QT's C+++ is really an awful thing. Copperspice being just normal C++ is interesting. Have to see what happens. But for me, C is where my heart is, so there is still two + that need to go for me. ;-)

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