Re: [GSoC] Integrate LO with GNOME - WR#7

Maybe I should consider updating the overlay only after I get the actual tile ?

On Fri, Jul 17, 2015 at 11:50 PM, Pranav Kant <pranav913@gmail.com> wrote:
> I followed the approach you mentioned.
>
> But the user experience is poor this way. As I am typing things on the
> keyboard the immediate effect is that it places dummy tiles for
> fraction of seconds in place of invalidated tiles. The callback gets
> called when the actual tile gets rendered, and it replaces the dummy
> tile with it.
>
> It was much better initially.
>
> Here[1] is the screencast of what I exactly want to say.
>
> [1] https://pranvk.fedorapeople.org/async.webm
>
> On Thu, Jul 16, 2015 at 1:18 AM, Michael Meeks
> <michael.meeks@collabora.com> wrote:
> > Hi Pranav,
> >
> > On Wed, 2015-07-15 at 23:48 +0530, Pranav Kant wrote:
> > > One important function that I am still not able to call in separate
> > > thread is drawing the tiles on the screen. The gtk passes the cairo
> > > contexts whenever 'draw' signal is emitted. The drawing works fine if
> > > I use this cairo contexts in a synchronous way,
> >
> >         Ho hum =) this is not possible. The Cairo context is (by design) only
> > live for the scope of the 'draw' signal - this is a feature heavily tied
> > to double buffering, and the gtk+ rendering infrastructure and it is a
> > 'good thing' (TM) =)
> >
> >         I would recommend instead rendering the tile content asynchronously,
> > and if we have no tile rendering something else ;-) ( a scaled version
> > of what was there, or a white background).
> >
> >         LibreOffice can render its tiles asynchronously rather nicely - and
> > when they show up - just call the gtk+ equivalent of invalidate:
> > gtk_widget_queue_draw_area() and in a few microseconds you should get
> > the callback with the cairo context that you want =)
> >
> >         Hope that helps ! =)
> >
> >         ATB,
> >
> >                 Michael.
> >
> > --
> >  michael.meeks@collabora.com  <><, Pseudo Engineer, itinerant idiot
>
>
>
> --
> Regards,
> Pranav Kant
> http://pranavk.me



-- 
Regards,
Pranav Kant
http://pranavk.me