An update on my work on generating thumbnails for web pages:
I solved my problem by writing a custom QQuickItem that, when updated,
renders the webview into a FBO and saves the contents of that FBO to a
file. The WebviewThumbnailer (as I named it) is not updated by default,
it has to be requested explicitly. I’ve implemented it in the Ubuntu
Touch web browser. For those interested, see the code here:
http://bazaar.launchpad.net/~phablet-team/webbrowser-app/trunk/view/head:/src/Ubuntu/Components/Extras/Browser/webview-thumbnailer.h
http://bazaar.launchpad.net/~phablet-team/webbrowser-app/trunk/view/head:/src/Ubuntu/Components/Extras/Browser/webview-thumbnailer.cpp
and how I’m using it in QML:
http://bazaar.launchpad.net/~phablet-team/webbrowser-app/trunk/view/head:/src/Ubuntu/Components/Extras/Browser/UbuntuWebView.qml#L192
This seems to be working pretty well. I’m no QML guru, so feedback and
remarks are very welcome!
Cheers,
Olivier
Olivier Tilloy a écrit :
On 2013-05-23, Jocelyn Turcotte <jocelyn.turco...@digia.com> wrote:
Hello,
if you want a QImage you should have a look at
QQuickWindow::grabWindow().
It only works on the whole scene, so currently you would have to cut
the part that interests you out of the QImage.
Thanks for the pointer. The documentation for this method says "Warning:
Calling this function will cause performance problems". Not very
reassuring… And having to extract a part of the image is not a fun
prospect either.
On Thu, May 23, 2013 at 09:20:18AM +0200, Martin Leutelt wrote:
I guess that what you want to do could be achieved in several ways,
depending on
which version of Qt/QML you're using.
Assuming you're using QtQuick1:
I’m using Qt5 and QtQuick2.
If you're using QtQuick2:
- also use ShaderEffectSource
- write a QML-plugin again, grab the whole screen of your application
an cut out
the area of the item you're interested in by using the coordinates
that you
passed to the plugin
I think that the solution using shaders would fit your purpose fine,
unless you
really need to have the 'screenshots' as real files. Hope that helps.
Yeah, I actually need to cache the image to a file. I’ve looked a bit
into the ShaderEffect idea, and I think if I write a custom one, I
should be able to render the node to a FBO and save it to a file. I have
yet to give it a shot. When that happens, I’ll keep you posted with the
results.
Thanks,
Olivier
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