[Qtwebengine] Build QtWebEngine on RaspBerry Pi
jocelyn.turcotte at digia.com
Mon Jan 5 19:35:55 CET 2015
QtWebEngine is only supported (as in "we'll provide fixes or workarounds for
customers on supported devices") with Qt for Device Creation but you can
also use it through the LGPLv3 licence that comes with the open source
version, as long as the licence fit your needs.
That said, QtWebEngine is quite heavy and you might get variable milleage
on a limited device like the RPi. The QtWebKit 3.0 QML module might get
you further in this situation, sadly with compromises.
On Mon, Dec 22, 2014 at 03:24:18PM +0100, LongChair69 . wrote:
> I have been trying to figure out how to get a decent performance on RPi,
> but i'm coming i think to a dead end until i overlooked something.
> my current app requires to use C++ and we would like to avoid any qml stuff
> as it's causing some issue with embedding some external components outside
> qt world.
> As far as i have understood (correct me if i'm wrong) there are 3
> possibilities :
> - Use QWebView in c++ : this leads to very poor performance on the rpi as
> it seems it will not use any hw accelerated backend.
> - Use QWebView with qml : this gives good performance, but causes issues to
> the other components we have to glue with.
> - Use QWebEngine : that was looking like a great thing, but the restriction
> of having the need for a QT embedded licence (where it was not the case up
> to now) looks like a very bad turn for homebrew developpers. Most Raspberry
> Pi applications are free and hombrew devs cannot afford Qt embedded version
> for community development.
> So did i miss something in my experimentations or am i coming to a dead end
> How can i achieve both performance, keep c++ without having to get qt
> embedded ?
> Any thoughts / comments are welcome ! :)
> 2014-11-19 13:41 GMT+01:00 Florian Bruhin <me at the-compiler.org>:
> > * LongChair69 . <longchair69 at gmail.com> [2014-11-19 13:31:08 +0100]:
> > > Ok i gave it a shot with QtGraphicsWebview and the simple sample below :
> > >
> > > [...]
> > >
> > > the url used is a small site to test css transforms with / without
> > > acceleration.
> > > given the speed i'm hitting on this sample, it doesn't looks like it is
> > > using any HW acceleration.
> > >
> > > Is there anything that i did wrong in the sample above, or any suggestion
> > > that would explain it's not hitting hw ?
> > I've not tried QGraphicsWebView myself yet so I'm only guessing, but
> > maybe you need to call setViewport on the QGraphicsView with a
> > QGLWidget?
> > From http://qt-project.org/doc/qt-5/qgraphicsview.html :
> > By default, QGraphicsView provides a regular QWidget for the
> > viewport widget. You can access this widget by calling viewport(),
> > or you can replace it by calling setViewport(). To render using
> > OpenGL, simply call setViewport(new QGLWidget). QGraphicsView
> > takes ownership of the viewport widget.
> > The blog post I linked before () alsop suggests this:
> > - Setting the QGraphicsView’s viewportUpdateMode to
> > BoundingRectViewportUpdate
> > Florian
> > 
> > http://blog.qt.digia.com/blog/2010/05/17/qtwebkit-now-accelerates-css-animations-3d-transforms/
> > --
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