[Sugar-devel] Preview

Daniel Narvaez dwnarvaez at gmail.com
Fri Sep 20 17:41:12 EDT 2013

Very tricky...

The gtk3 API allows activities to override the preview and it seems like we
should keep that feature here. I feel like to do that sanely the js code
needs to be able to see the screenshot.

A clean implementation of a javascript screenshot API (both chrome and
firefox has one for extensions fwiw) would require to write a webkit
"extension". Those must be written in C unfortunately, epiphany has one I
think so we could at least take inspiration. An extension might be useful
to do other stuff in the future, for example the environment stuff could be
implemented more cleanly that way.

Another approach I can think of is: javascript requests the screenshot on
the apisocket, the shell gets it from the activity trough dbus. Though it
requires two ipc steps and it doesn't even make much sense conceptually.

I'm not sure what we should here exactly, just dumping my brain.

On 20 September 2013 22:28, Suraj K S <suraj.gillespie at gmail.com> wrote:

> I'm able to capture the screenshot of a web activity by making use of
> http://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#webkit-web-view-get-snapshot
> .
> (The image quality seems to be pretty good. In fact, way better than the
> current preview screenshots in python activities)
> I make those calls here,
> https://github.com/sugarlabs/sugar-toolkit-gtk3/blob/master/src/sugar3/activity/webactivity.py
> The question is, do we need to pass it(base64 encoded image) to the js api?
> Or would it suffice to just add it to the datastore object on the shell
> side (how)?

Daniel Narvaez
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